Agradecemos B. Conklin (Universidade da Califórnia, San Francisco) por fornecer os qi5 G e G QS5 cDNAs, A. Schweitzer para assistência com a eletrônica, N. Taylor para a assistência com a seleção de clones, Ian Glaaser e Robert Rifkin para leitura de prova e Olivier Griesbeck para TN-XXL. Este trabalho foi apoiado por bolsas de investigação, através do Instituto Nacional sobre Abuso de Drogas (NIDA) (DA029706; DA037170), o Instituto Nacional de Imagem Biomédica e Bioengenharia (NIBIB) (EB003832), Hoffman-La Roche (88610A) eo &quot;Neuroscience relacionados com a droga de bolsa de formação abuso &quot;por meio de NIDA (DA007315).

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Os autores não têm nada para revelar.

A criação de CNiFERs proporciona uma estratégia inovadora e original para opticamente medição da libertação de neurotransmissores no cérebro in vivo. CNiFERs são idealmente adequados para a medição da libertação de extrasynaptic, ou seja, o volume de condução, para neurotransmissores. Importante, cada CNiFER possui as propriedades do GPCR nativo, proporcionando uma medição óptica fisiológica das alterações nos níveis de neurotransmissores no cérebro. Até à data, CNiFERs foram c...

Para entender completamente como os neurônios se comunicam no cérebro, é necessário ter um método para medir a liberação de neurotransmissores in vivo. Existem várias técnicas bem estabelecidas para a medição in vivo neurotransmissores. Uma técnica utilizada é de microdiálise, em que uma cânula é inserida no cérebro e um pequeno volume de fluido cerebrospinal são recolhidas e analisadas por cromatografia líquida de elevado desempenho e detecção electroquímica 1. Microdiálise tem uma resolução espacial na ordem de alguns diâmetros da sonda, por exemplo, ~ 0,5 mm para uma microssonda de 200 um de diâmetro. A resolução temporal desta técnica, no entanto, é lento devido a intervalos de amostragem que duram tipicamente ~ 5 minutos ou mais 1. Além disso, as análises não são feitos em tempo real. Uma outra técnica é a pesquisa rápida voltametria cíclica (FSCV), que usa uma sonda de fibra de carbono que é introduzido no cérebro. FSCV tem excelente Tempresolução oral (subsecond), de alta sensibilidade (nanomolar), e resolução espacial com o diâmetro da sonda de 5 a 30 um. No entanto, está limitado a FSCV transmissores, que produzem uma característica de oxidação e redução perfil com tensão em uma sonda potenciométrica de carbono 2. Uma terceira técnica para medir neurotransmissores é diretamente através de neurotransmissores geneticamente codificado (NT) biossensores 3. Com este método, uma proteína de fusão é criada que contém um domínio de ligação ao ligando para um transmissor acoplado a uma transferência de energia de ressonância de fluorescência (FRET) par com base na fluoróforos de 4 ou 5 permutado um GFP. Ao contrário dos dois métodos anteriores, estes biossensores são geneticamente codificado e expresso na superfície de uma célula hospedeira, tal como um neurónio, através da produção de animais transgénicos ou de forma aguda com a utilização de agentes virais para infectar as células. Até à data, biossensores geneticamente codificados só foram desenvolvidos para detecting glutamato e GABA 3-5. Limitações com estas técnicas têm sido a baixa sensibilidade, na gama nM, e a incapacidade para expandir a detecção de um grande número de emissores, por exemplo, neurotransmissores clássicos, neuropéptidos e neuromoduladores, que sinalizam através de receptores acoplados à proteína G (GPCRs). Na verdade, existem cerca de 800 GPCRs no genoma humano. Para lidar com essas deficiências, desenvolvemos uma ferramenta inovadora para liberação medida opticamente de qualquer neurotransmissor que sinaliza através de um GPCR. CNiFERs (com base nas células repórteres fluorescentes modificadas neurotransmissor) são células HEK293 clonais manipuladas para expressar um GPCR específico que, quando estimulados, desencadeia um aumento na intracelular [Ca2 +] que é detectado por um sensor baseado em FRET de Ca 2+ geneticamente codificado, TN-XXL. Assim, obrigatório neurotransmissor CNiFERs transformar-se numa alteração na fluorescência, proporcionando uma óptica R em tempo real e directa do receptoread-out da actividade neurotransmissora local. Ao utilizar o receptor nativo para um determinado neurotransmissor, CNiFERs reter a especificidade química, afinidade e dinâmicas temporais dos receptores expresso endogenamente. Até à data, criámos três tipos de CNiFERs, um para detectar a acetilcolina utilizando o receptor M1, um para a detecção de dopamina utilizando o receptor D2, e um para detectar a norepinefrina usando o receptor de 6,7 α1a. A tecnologia CNiFER é facilmente expansível e escalável, tornando-se passível de qualquer tipo de GPCR. Neste artigo Jove, que descrevem e ilustram a metodologia para conceber, realizar, e teste em CNiFERs vivo para qualquer aplicação.

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			<td style="width:191px;">BD Biosciences</td>
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			<td>FACS</td>
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			<td style="width:191px;">BD Biosciences</td>
			<td>352340</td>
			<td>FACS</td>
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			<td>FACS</td>
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			<td>3596</td>
			<td>FACS</td>
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			<td>Corning&#160;</td>
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			<td>Flexstation</td>
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			<td height="20" style="height:20px;">Optilux black clear bottom&#160;</td>
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			<td>3603</td>
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			<td>9000-0911</td>
			<td>Flexstation</td>
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			<td>Flexstation</td>
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			<td style="width:191px;">SimgaAldrich</td>
			<td style="width:429px;">A2129</td>
			<td>Flexstation</td>
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			<td style="width:191px;">SimgaAldrich</td>
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			<td>Flexstation</td>
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			<td style="width:191px;">SimgaAldrich</td>
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			<td>Flexstation</td>
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			<td style="width:191px;">SimgaAldrich</td>
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			<td style="width:429px;">S6883</td>
			<td>Flexstation</td>
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			<td style="width:191px;">SimgaAldrich</td>
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			<td>Flexstation</td>
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			<td height="20" style="height:20px;width:387px;">Fluorescence Plate Reader &#38; software</td>
			<td style="width:191px;">Molecular Devices</td>
			<td style="width:429px;">Flexstation 3</td>
			<td>Flexstation</td>
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			<td style="width:191px;">Life Technologies</td>
			<td style="width:429px;">10569-010</td>
			<td>Tissue culture</td>
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			<td style="width:191px;">Life Technologies</td>
			<td style="width:429px;">10082-139</td>
			<td>Tissue culture</td>
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			<td height="20" style="height:20px;width:387px;">&#160;Pen/Strep&#160;</td>
			<td style="width:191px;">Life Technologies</td>
			<td style="width:429px;">15140-122</td>
			<td>Tissue culture</td>
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			<td style="width:191px;">InvivoGen</td>
			<td style="width:429px;">ant-pr-1</td>
			<td>Tissue culture</td>
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			<td height="20" style="height:20px;width:387px;">&#160;Fibronectin&#160;</td>
			<td style="width:191px;">SimgaAldrich</td>
			<td style="width:429px;">F0895</td>
			<td>Tissue culture</td>
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			<td height="40" style="height:40px;width:387px;">CoolCell LX Alcohol-free controlled-rate cell freezing box</td>
			<td style="width:191px;">Bioexpress</td>
			<td style="width:429px;">D-3508)</td>
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			<td height="20" style="height:20px;width:387px;">cyanoacrylate glue&#160;</td>
			<td style="width:191px;">Loctite</td>
			<td style="width:429px;">Loctite no. 495</td>
			<td>surgery and stereotaxic injection</td>
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			<td>surgery and stereotaxic injection</td>
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			<td height="20" style="height:20px;">NANOINJECTOR</td>
			<td style="width:191px;">Drummond</td>
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			<td height="20" style="height:20px;">GLASS ELECTRODES</td>
			<td style="width:191px;">Drummond</td>
			<td style="width:429px;">3-000-203G</td>
			<td>surgery and stereotaxic injection</td>
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			<td height="20" style="height:20px;">hand held drill</td>
			<td style="width:191px;">OSADA</td>
			<td style="width:429px;">Exl-M40</td>
			<td>surgery and stereotaxic injection</td>
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			<td height="20" style="height:20px;">Burrs for drill</td>
			<td style="width:191px;">Fine Scientific</td>
			<td style="width:429px;">19007-05; 19007-07)</td>
			<td>surgery and stereotaxic injection</td>
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			<td height="20" style="height:20px;width:387px;">Sterilizing bath</td>
			<td style="width:191px;">FST</td>
			<td style="width:429px;">18000-45, Hot Bead Sterilizer</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:387px;">isoflurane chamber/mask</td>
			<td style="width:191px;">Highland Medical Equipment</td>
			<td style="width:429px;">564-0427, HME 109 Table Top Anesthetic Machine with Isoflurane Vaporizer, O2 Flowmeter, Gang Valve; 564-0852, Induction Chamber 16X7X7.5cm</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
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			<td height="20" style="height:20px;width:387px;">3D scope with arm</td>
			<td style="width:191px;">Zeiss</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">fiber optic light</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Betadine&#160;</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">70 % (v/v) isopropyl alcohol</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Povidone-Iodine Prep Pads</td>
			<td style="width:191px;">dynarex</td>
			<td style="width:429px;">1108</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">NaCl 0.9% (INJECTION, USP, 918610)</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">CYCLOSPORINE (INJECTION, USP)</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Buprenex (INJECTION) buprenorphine (0.03 &#956;g per g rodent)</td>
			<td style="width:191px;">Sigma</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Ophthalmic ointment&#160;</td>
			<td style="width:191px;">Akorn</td>
			<td style="width:429px;">NDC 17478-235-35</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Surgifoam</td>
			<td style="width:191px;">Ethicon</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Grip dental cement</td>
			<td style="width:191px;">Dentsply</td>
			<td style="width:429px;">#675571, 675572</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Instant SuperGlue&#160;</td>
			<td style="width:191px;">NDindustries</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">LOCTITE 4041</td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">METABOND</td>
			<td style="width:191px;">C&#38;B</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">no. 0 cover glass</td>
			<td style="width:191px;">Fisher</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">stereotaxic frame&#160;</td>
			<td style="width:191px;">Kopf</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;">Rectal probe and heating pad</td>
			<td style="width:191px;">FHC</td>
			<td style="width:429px;">40-90-8D, DC Temperature Controller,40-90-2-06, 6.5X9.5cm Heating Pad40-90-5D-02, Rectal Thermistor Probe</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">optical breadboard for imaging</td>
			<td style="width:191px;">Thorlabs</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Mineral oil</td>
			<td style="width:191px;">Fisher</td>
			<td style="width:429px;">S55667</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Kwik-Cast (Silicone elastomer)</td>
			<td style="width:191px;">World Precision Instruments</td>
			<td style="width:429px;"></td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Suture&#160;&#160;</td>
			<td style="width:191px;">Ethicon</td>
			<td style="width:429px;">18&#8217;&#8217;, 1667, 4-0</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Scissors</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">91500-09, 15018-10</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Forcepts</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">11252-30; #55, 11295-51; Grafe, 11050-10</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Student Halsted-Mosquito Hemostats</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">91308-12</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Small Vessel Cauterizer Kit</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">18000-00</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Hot Bead Sterilizers</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">18000-45</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Instrument Case with Silicone Mat</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">20311-21</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Plastic Sterilization Containers with Silicone Mat</td>
			<td style="width:191px;">Fine Scientific Tools</td>
			<td style="width:429px;">20810-01</td>
			<td>surgery and stereotaxic injection</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;"></td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;"></td>
			<td style="width:191px;"></td>
			<td style="width:429px;"></td>
			<td></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:387px;">2P fixed-stage fluorescence scope for in vivo imaging</td>
			<td style="width:191px;">Olympus</td>
			<td style="width:429px;">FV1200 MPE</td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">Multiphoton laser</td>
			<td style="width:191px;">SpectraPhysics</td>
			<td style="width:429px;">Mai Tai DeepSee</td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">Green Laser</td>
			<td style="width:191px;">Olympus</td>
			<td style="width:429px;">473 nm Laser</td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">xy translation base</td>
			<td style="width:191px;">Scientifica</td>
			<td style="width:429px;">MMBP</td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">FRET filter cube for YFP and CFP</td>
			<td style="width:191px;">Olympus</td>
			<td style="width:429px;"></td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">25-X water immersion objective</td>
			<td style="width:191px;">Olympus</td>
			<td style="width:429px;"></td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">air table</td>
			<td style="width:191px;">Newport</td>
			<td style="width:429px;"></td>
			<td>in vivo imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:387px;">custom built light-tight cage</td>
			<td style="width:191px;">Thorlab</td>
			<td style="width:429px;"></td>
			<td>in vivo imaging</td>
		</tr>
	</tbody>
</table>

construction of cell-based neurotransmitter fluorescent engineered reporters (cnifers) for optical detection of neurotransmitters in vivo

Com base nas células repórteres fluorescentes neurotransmissor modificadas (CNiFERs) fornecer uma nova ferramenta para neurocientistas para detectar opticamente a libertação de neurotransmissores no cérebro in vivo. A CNiFER específica é criada a partir de uma célula de rim embrionário humano que expressa estavelmente um receptor específico G acoplado a proteína, que os casais a G q / 11 proteínas G, e uma baseada em FRET Ca 2+ -detector, TN-XXL. A activação do receptor conduz a um aumento no sinal de FRET. CNiFERs tem sensibilidade nM e uma resposta temporal do segundo porque um clone CNiFER utiliza o receptor nativo para um neurotransmissor particular, por exemplo, para D2R dopamina. CNiFERs são directamente implantadas no cérebro, permitindo-lhes sentir a libertação de neurotransmissores, com uma resolução espacial de menos de cem um, tornando-as ideais para medir a transmissão de volume in vivo. CNiFERs também podem ser utilizados para pesquisar outros fármacos para o potencial reactividade cruzada em VIvo. Nós recentemente expandiu a família de CNiFERs para incluir GPCRs que o casal a G i / o G proteínas. CNiFERs estão disponíveis para a detecção de acetilcolina (ACh), dopamina (DA) e norepinefrina (NE). Dado que qualquer GPCR pode ser utilizado para criar um novo CNiFER e que há aproximadamente 800 GPCRs no genoma humano, descrevemos aqui o procedimento geral para conceber, realizar, e testar qualquer tipo de CNiFER.

Um CNiFER é derivada de uma célula de rim embrionário humano (HEK293) que é manipulada para expressar de forma estável pelo menos duas proteínas: uma proteína G específica acoplada do receptor (GPCR) e uma [Ca 2+] Sensor geneticamente codificado, TN-XL. TN-XXL sofre de ressonância de fluorescência de transferência de energia (FRET) entre proteínas ciano e amarelo fluorescente, eCFP e citrino, respectivamente, em resposta ao Ca 2+ 6,15. A activ...

Watch this Scientific Journal Video about Construction of Cell-based Neurotransmitter Fluorescent Engineered Reporters CNiFERs for Optical Detection of Neurotransmitters In Vivo at JoVE.com

Construction of Cell-based Neurotransmitter Fluorescent Engineered Reporters CNiFERs for Optical Detection of Neurotransmitters In Vivo

Nós apresentamos um protocolo para criar baseada em células neurotransmissor fluorescentes repórteres modificadas (CNiFERs) para a detecção óptica de liberação do neurotransmissor volumétrica.

Construção de-base celular Neurotransmissores fluorescentes Engineered Repórteres (CNiFERs) para detecção óptica de neurotransmissores<em&gt; In Vivo</em

Cell-based neurotransmitter fluorescent engineered reporters (CNiFERs) provide a new tool for neuroscientists to optically detect the release of ...

construction-cell-based-neurotransmitter-fluorescent-engineered

Research

JoVE Journal

Neuroscience

Construction of Cell-based Neurotransmitter Fluorescent Engineered Reporters (CNiFERs) for Optical Detection of Neurotransmitters In Vivo

13.1K visualizações.  Icahn School of Medicine at Mount Sinai.  Nós apresentamos um protocolo para criar baseada em células neurotransmissor fluorescentes repórteres modificadas (CNiFERs) para a detecção óptica de liberação do neurotransmissor volumétrica. 

Vídeo: Construction of Cell-based Neurotransmitter Fluorescent Engineered Reporters CNiFERs for Optical Detection of Neurotransmitters In Vivo

Assessing Burrowing, Nest Construction, and Hoarding in Mice

Deterioration in the ability to perform "Activities of daily living" (ADL) is an early sign of Alzheimer's disease (AD). Preclinical behavioural screening of possible treatments for AD currently largely focuses on cognitive testing, which frequently demands expensive equipment and lots of experimenter time. However, human episodic memory (the most severely affected aspect of memory in AD) is different to rodent memory, which seems to be largely non-episodic. Therefore the present ways of screening for new AD treatments for AD in rodents are intrinsically unlikely to succeed. A new approach to preclinical screening would be to characterise the ADL of mice. Fortuitously, several such assays have recently been developed at Oxford, and here the three most sensitive and well-characterised are presented.
Burrowing was first developed in Oxford13. It evolved from a need to develop a mouse hoarding paradigm. Most published rodent hoarding paradigms required a distant food source to be linked to the home cage by a connecting passage. This would involve modifying the home cage as well as making a mouse-proof connecting passage and food source. So it was considered whether it would be possible to put the food source inside the cage. It was found that if a container was placed on the floor it was emptied by the next morning., The food pellets were, however, simply deposited in a heap at the container entrance, rather than placed in a discrete place away from the container, as might be expected if the mice were truly hoarding them. Close inspection showed that the mice were performing digging ("burrowing") movements, not carrying the pellets in their mouths to a selected place as they would if truly hoarding them.6



Food pellets are not an essential substrate for burrowing; mice will empty tubes filled with sand, gravel, even soiled bedding from their own cage. Moreover, they will empty a full tube even if an empty one is placed next to it8.



Several nesting protocols exist in the literature. The present Oxford one simplifies the procedure and has a well-defined scoring system for nest quality5. 



A hoarding paradigm was later developed in which the mice, rather than hoarding back to the real home cage, were adapted to living in the "home base" of a hoarding apparatus. This home base was connected to a tube made of wire mesh, the distal end of which contained the food source. This arrangement proved to yield good hoarding behaviour, as long as the mice were adapted to living in the "home base" during the day and only allowed to enter the hoarding tube at night.

Burrowing, nesting, and hoarding are species-typical activities that mice readily perform in the laboratory. This article describes how they can be easily and cheaply assessed. These protocols are extremely sensitive to mouse strain, brain lesions and diseases. Moreover they constitute &#x201C;environmental enrichment&#x201D; for the mice, and embody the &#x201C;Refinement&#x201D; aspect of the &#x201C;3 Rs&#x201D;18.

Avaliar buraqueira, Construção Nest, e Hoarding em Ratos

Deterioration in the ability to perform "Activities of daily living" (ADL) is an early sign of Alzheimer's disease (AD). Preclinical behavioural screening ...

Neurociência

Transfection of Mouse Retinal Ganglion Cells by in vivo Electroporation

The targeting and refinement of RGC projections to the midbrain is a popular and powerful model system for studying how precise patterns of neural connectivity form during development. In mice, retinofugal projections are arranged in a topographic manner and form eye-specific layers in the Lateral Geniculate Nucleus (dLGN) of the thalamus and the Superior Colliculus (SC). The development of these precise patterns of retinofugal projections has typically been studied by labeling populations of RGCs with fluorescent dyes and tracers, such as horseradish peroxidase1-4. However, these methods are too coarse to provide insight into developmental changes in individual RGC axonal arbor morphology that are the basis of retinotopic map formation. They also do not allow for the genetic manipulation of RGCs.
Recently, electroporation has become an effective method for providing precise spatial and temporal control for delivery of charged molecules into the retina5-11. Current retinal electroporation protocols do not allow for genetic manipulation and tracing of retinofugal projections of a single or small cluster of RGCs in postnatal mice. It has been argued that postnatal in vivo electroporation is not a viable method for transfecting RGCs since the labeling efficiency is extremely low and hence requires targeting at embryonic ages when RGC progenitors are undergoing differentiation and proliferation6. 
In this video we describe an in vivo electroporation protocol for targeted delivery of genes, shRNA, and fluorescent dextrans to murine RGCs postnatally. This technique provides a cost effective, fast and relatively easy platform for efficient screening of candidate genes involved in several aspects of neural development including axon retraction, branching, lamination, regeneration and synapse formation at various stages of circuit development. In summary we describe here a valuable tool which will provide further insights into the molecular mechanisms underlying sensory map development.

Transfection of Mouse Retinal Ganglion Cells by in vivo Electroporation

We demonstrate an in vivo electroporation protocol for transfecting single or small clusters of retinal ganglion cells (RGCs) and other retinal cell types in postnatal mice over a wide range of ages. The ability to label and genetically manipulate postnatal RGCs in vivo is a powerful tool for developmental studies.

Transfecção de células de camundongo por Ganglionares da Retina In vivo Eletroporação

The targeting and refinement of RGC projections to the midbrain is a popular and powerful model system for studying how precise patterns of neural ...

Retrograde Fluorescent Labeling Allows for Targeted Extracellular Single-unit Recording from Identified Neurons In vivo

The overall goal of this method is to record single-unit responses from an identified population of neurons. In vivo electrophysiological recordings from individual neurons are critical for understanding how neural circuits function under natural conditions. Traditionally, these recordings have been performed 'blind', meaning the identity of the recorded cell is unknown at the start of the recording. Cellular identity can be subsequently determined via intracellular1, juxtacellular2 or loose-patch3 iontophoresis of dye, but these recordings cannot be pre-targeted to specific neurons in regions with functionally heterogeneous cell types. Fluorescent proteins can be expressed in a cell-type specific manner permitting visually-guided single-cell electrophysiology4-6. However, there are many model systems for which these genetic tools are not available. Even in genetically accessible model systems, the desired promoter may be unknown or genetically homogenous neurons may have varying projection patterns. Similarly, viral vectors have been used to label specific subgroups of projection neurons7, but use of this method is limited by toxicity and lack of trans-synaptic specificity. Thus, additional techniques that offer specific pre-visualization to record from identified single neurons in vivo are needed. Pre-visualization of the target neuron is particularly useful for challenging recording conditions, for which classical single-cell recordings are often prohibitively difficult8-11. The novel technique described in this paper uses retrograde transport of a fluorescent dye applied using tungsten needles to rapidly and selectively label a specific subset of cells within a particular brain region based on their unique axonal projections, thereby providing a visual cue to obtain targeted electrophysiological recordings from identified neurons in an intact circuit within a vertebrate CNS.
The most significant novel advancement of our method is the use of fluorescent labeling to target specific cell types in a non-genetically accessible model system. Weakly electric fish are an excellent model system for studying neural circuits in awake, behaving animals12. We utilized this technique to study sensory processing by "small cells" in the anterior exterolateral nucleus (ELa) of weakly electric mormyrid fish. "Small cells" are hypothesized to be time comparator neurons important for detecting submillisecond differences in the arrival times of presynaptic spikes13. However, anatomical features such as dense myelin, engulfing synapses, and small cell bodies have made it extremely difficult to record from these cells using traditional methods11, 14. Here we demonstrate that our novel method selectively labels these cells in 28% of preparations, allowing for reliable, robust recordings and characterization of responses to electrosensory stimulation.

Retrograde Fluorescent Labeling Allows for Targeted Extracellular Single-unit Recording from Identified Neurons In vivo

Retrograde transport of fluorescent dye labels a sub-population of neurons based on anatomical projection. Labeled axons can be visually targeted in vivo, permitting extracellular recording from identified axons. This technique facilitates recording when neurons cannot be labeled through genetic manipulation or are difficult to isolate using 'blind' in vivo approaches.

Labeling fluorescentes retrógrada Permite alvejado Extracelular Gravação Single-unidade dos neurônios identificados<em&gt; In vivo</em

The overall goal of this method is to record single-unit responses from an identified population of neurons. In vivo electrophysiological recordings from ...

Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI

Although mice are the dominant model system for studying the genetic and molecular underpinnings of neuroscience, functional neuroimaging in mice remains technically challenging. One approach, Activation-Induced Manganese-enhanced MRI (AIM MRI), has been used successfully to map neuronal activity in rodents 1-5. In AIM MRI, Mn2+ acts a calcium analog and accumulates in depolarized neurons 6,7. Because Mn2+ shortens the T1 tissue property, regions of elevated neuronal activity will enhance in MRI. Furthermore, Mn2+ clears slowly from the activated regions; therefore, stimulation can be performed outside the magnet prior to imaging, enabling greater experimental flexibility. However, because Mn2+ does not readily cross the blood-brain barrier (BBB), the need to open the BBB has limited the use of AIM MRI, especially in mice.
One tool for opening the BBB is ultrasound. Though potentially damaging, if ultrasound is administered in combination with gas-filled microbubbles (i.e., ultrasound contrast agents), the acoustic pressure required for BBB opening is considerably lower. This combination of ultrasound and microbubbles can be used to reliably open the BBB without causing tissue damage 8-11.
Here, a method is presented for performing AIM MRI by using microbubbles and ultrasound to open the BBB. After an intravenous injection of perflutren microbubbles, an unfocused pulsed ultrasound beam is applied to the shaved mouse head for 3 minutes. For simplicity, we refer to this technique of BBB Opening with Microbubbles and UltraSound as BOMUS 12. Using BOMUS to open the BBB throughout both cerebral hemispheres, manganese is administered to the whole mouse brain. After experimental stimulation of the lightly sedated mice, AIM MRI is used to map the neuronal response.
To demonstrate this approach, herein BOMUS and AIM MRI are used to map unilateral mechanical stimulation of the vibrissae in lightly sedated mice 13. Because BOMUS can open the BBB throughout both hemispheres, the unstimulated side of the brain is used to control for nonspecific background stimulation. The resultant 3D activation map agrees well with published representations of the vibrissae regions of the barrel field cortex 14. The ultrasonic opening of the BBB is fast, noninvasive, and reversible; and thus this approach is suitable for high-throughput and/or longitudinal studies in awake mice.

A technique is described for broadly opening the blood-brain barrier in the mouse using microbubbles and ultrasound. Using this technique, manganese can be administered to the mouse brain. Because manganese is an MRI contrast agent that accumulates in depolarized neurons, this approach enables imaging of neuronal activity.

Neuroimagem Funcional Usando rompimento da barreira hemato-encefálica ultra-sônico e Manganês-RM

Although mice are the dominant model system for studying the genetic and molecular underpinnings of neuroscience, functional neuroimaging in mice remains ...

Thinned-skull Cortical Window Technique for In Vivo Optical Coherence Tomography Imaging

Optical coherence tomography (OCT) is a biomedical imaging technique with high spatial-temporal resolution. With its minimally invasive approach OCT has been used extensively in ophthalmology, dermatology, and gastroenterology1-3. Using a thinned-skull cortical window (TSCW), we employ spectral-domain OCT (SD-OCT) modality as a tool to image the cortex in vivo. Commonly, an opened-skull has been used for neuro-imaging as it provides more versatility, however, a TSCW approach is less invasive and is an effective mean for long term imaging in neuropathology studies. Here, we present a method of creating a TSCW in a mouse model for in vivo OCT imaging of the cerebral cortex.

Thinned-skull Cortical Window Technique for In Vivo Optical Coherence Tomography Imaging

We present a method of creating a thinned-skull cortical window (TSCW) in a mouse model for in vivo OCT imaging of the cerebral cortex.

Diluído crânio-técnica de janela cortical para<em&gt; Em Vivo</em&gt; Tomografia de coerência óptica

Optical coherence tomography (OCT) is a biomedical imaging technique  with high spatial-temporal resolution. With its minimally invasive approach OCT  has ...

Modeling Astrocytoma Pathogenesis In Vitro and In Vivo Using Cortical Astrocytes or Neural Stem Cells from Conditional, Genetically Engineered Mice

Current astrocytoma models are limited in their ability to define the roles of oncogenic mutations in specific brain cell types during disease pathogenesis and their utility for preclinical drug development. In order to design a better model system for these applications, phenotypically wild-type cortical astrocytes and neural stem cells (NSC) from conditional, genetically engineered mice (GEM) that harbor various combinations of floxed oncogenic alleles were harvested and grown in culture. Genetic recombination was induced in vitro using adenoviral Cre-mediated recombination, resulting in expression of mutated oncogenes and deletion of tumor suppressor genes. The phenotypic consequences of these mutations were defined by measuring proliferation, transformation, and drug response in vitro. Orthotopic allograft models, whereby transformed cells are stereotactically injected into the brains of immune-competent, syngeneic littermates, were developed to define the role of oncogenic mutations and cell type on tumorigenesis in vivo. Unlike most established human glioblastoma cell line xenografts, injection of transformed GEM-derived cortical astrocytes into the brains of immune-competent littermates produced astrocytomas, including the most aggressive subtype, glioblastoma, that recapitulated the histopathological hallmarks of human astrocytomas, including diffuse invasion of normal brain parenchyma. Bioluminescence imaging of orthotopic allografts from transformed astrocytes engineered to express luciferase was utilized to monitor in vivo tumor growth over time. Thus, astrocytoma models using astrocytes and NSC harvested from GEM with conditional oncogenic alleles provide an integrated system to study the genetics and cell biology of astrocytoma pathogenesis in vitro and in vivo and may be useful in preclinical drug development for these devastating diseases.

Modeling Astrocytoma Pathogenesis In Vitro and In Vivo Using Cortical Astrocytes or Neural Stem Cells from Conditional, Genetically Engineered Mice

Phenotypically wild-type astrocytes and neural stem cells harvested from mice engineered with floxed, conditional oncogenic alleles and transformed via viral Cre-mediated recombination can be used to model astrocytoma pathogenesis in vitro and in vivo by orthotopic injection of transformed cells into brains of syngeneic, immune-competent littermates.

Modelagem astrocitoma Patogênese<em&gt; In Vitro</em&gt; E<em&gt; In Vivo</em&gt; Usando Cortical astrócitos ou células-tronco neurais de condicional, Geneticamente Modificadas Ratos

Current astrocytoma models are limited in their ability to define the roles of oncogenic mutations in specific brain cell types during disease ...

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System

An In vivo electroretinogram (ERG) signal is composed of several overlapping components originating from different retinal cell types, as well as noise from extra-retinal sources. Ex vivo ERG provides an efficient method to dissect the function of retinal cells directly from an intact isolated retina of animals or donor eyes. In addition, ex vivo ERG can be used to test the efficacy and safety of potential therapeutic agents on retina tissue from animals or humans. We show here how commercially available in vivo ERG systems can be used to conduct ex vivo ERG recordings from isolated mouse retinas. We combine the light stimulation, electronic and heating units of a standard in vivo system with custom-designed specimen holder, gravity-controlled perfusion system and electromagnetic noise shielding to record low-noise ex vivo ERG signals simultaneously from two retinas with the acquisition software included in commercial in vivo systems. Further, we demonstrate how to use this method in combination with pharmacological treatments that remove specific ERG components in order to dissect the function of certain retinal cell types.

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System

Ex vivo ERG can be used to record electrical activity of retinal cells directly from isolated intact retinas of animals or humans. We demonstrate here how common in vivo ERG systems can be adapted for ex vivo ERG recordings in order to dissect the electrical activity of retinal cells.

Simultâneo<em&gt; Ex vivo</em&gt; Teste Funcional de Dois retinas por<em&gt; In vivo</em&gt; Sistema Eletrorretinograma

An In vivo electroretinogram (ERG) signal is composed of several overlapping components originating from different retinal cell types, as well as noise ...

Optical Monitoring of Living Nerve Terminal Labeling in Hair Follicle Lanceolate Endings of the Ex Vivo Mouse Ear Skin

A novel dissection and recording technique is described for optical monitoring staining and de-staining of lanceolate terminals surrounding hair follicles in the skin of the mouse pinna. The preparation is simple and relatively fast, reliably yielding extensive regions of multiple labeled units of living nerve terminals to study uptake and release of styryl pyridinium dyes extensively used in studies of vesicle recycling. Subdividing the preparations before labeling allows test vs. control comparisons in the same ear from a single individual. Helpful tips are given for improving the quality of the preparation, the labeling and the imaging parameters. This new system is suitable for assaying pharmacologically and mechanically-induced uptake and release of these vital dyes in lanceolate terminals in both wild-type and genetically modified animals. Examples of modulatory influences on labeling intensity are given.

Optical Monitoring of Living Nerve Terminal Labeling in Hair Follicle Lanceolate Endings of the Ex Vivo Mouse Ear Skin

Here we describe a novel preparation for imaging live lanceolate sensory terminals of palisade endings that innervate mouse ear skin hair follicles during staining and destaining with styryl pyridinium dyes.

Monitoramento óptico do nervo Viver Terminal Etiquetagem na folículo piloso Lanceolate Endings da<em&gt; Ex Vivo</em&gt; Mouse pele da orelha

A novel dissection and recording technique is described for optical monitoring staining and de-staining of lanceolate terminals surrounding hair follicles ...

Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo

Structural changes in the retina are common manifestations of ophthalmic diseases. Optical coherence tomography (OCT) enables their identification in vivo&#8212;rapidly, repetitively, and at a high resolution. This protocol describes OCT imaging in the mouse retina as a powerful tool to study optic neuropathies (OPN). The OCT system is an interferometry-based, non-invasive alternative to common post mortem histological assays. It provides a fast and accurate assessment of retinal thickness, allowing the possibility to track changes, such as retinal thinning or thickening. We present the imaging process and analysis with the example of the Opa1delTTAG mouse line. Three types of scans are proposed, with two quantification methods: standard and homemade calipers. The latter is best for use on the peripapillary retina during radial scans; being more precise, is preferable for analyzing thinner structures. All approaches described here are designed for retinal ganglion cells (RGC) but are easily adaptable to other cell populations. In conclusion, OCT is efficient in mouse model phenotyping and has the potential to be used for the reliable evaluation of therapeutic interventions.

Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo

This manuscript describes a protocol for the in vivo imaging of the mouse retina with high-resolution spectral domain optical coherence tomography (SD-OCT). It focuses on retinal ganglion cells (RGC) in the peripapillary region, with several scanning and quantifying approaches described.

Tomografia de coerência óptica: Imagens Mouse ganglionares da retina células In Vivo

Structural changes in the retina are common manifestations of ophthalmic diseases. Optical coherence tomography (OCT) enables their identification in ...

Measuring In Vivo Changes in Extracellular Neurotransmitters During Naturally Rewarding Behaviors in Female Syrian Hamsters

The ability to measure neurotransmitter release on a rapid time scale allows patterns of neurotransmission to be linked to specific behaviors or manipulations; a powerful tool in elucidating underlying mechanisms and circuitry. While the technique of microdialysis has been used for decades to measure nearly any analyte of interest in the brain, this technique is limited in temporal resolution. Alternatively, fast scan cyclic voltammetry is both temporally precise and extremely sensitive; however, because this technically difficult method relies on the electroactivity of the analyte of interest, the possibility to detect nonelectroactive substances (e.g., the neurotransmitter glutamate) is eliminated. This paper details the use of a turn-key system that combines fixed-potential amperometry and enzymatic biosensing to measure both electroactive and nonelectroactive neurotransmitters with temporal precision. The pairing of these two powerful techniques allows for the measurement of both tonic and phasic neurotransmission with relative ease, and permits recording of multiple neurotransmitters simultaneously. The aim of this manuscript is to demonstrate the process of measuring dopamine and glutamate neurotransmission in vivo using a naturally rewarding behavior (i.e., sexual behavior) in female hamsters, with the ultimate goal of displaying the technical feasibility of this assay for examining other behaviors and experimental paradigms.

Measuring In Vivo Changes in Extracellular Neurotransmitters During Naturally Rewarding Behaviors in Female Syrian Hamsters

This paper details the use of fixed-potential amperometric recordings using carbon fiber electrodes and enzymatic biosensor technology to measure the release of dopamine and glutamate with high temporal resolution during natural rewarding behavior in the female hamster.

Medição In Vivo alterações em neurotransmissores extracelulares durante naturalmente recompensando comportamentos em Hamsters sírios femininos