Work in the lab involving the culturing of Aplysia neurons is funded by list NIH R01 and NIH R21MH077921.

Preparation (see solutions section at end of protocol for composition of solutions)
<ol>
<li>Prepare culture dishes. Coat glass well of Mattek glass-bottom culture dish with poly-l-lysine (made in sodium borate). Add enough to completely cover the glass well and leave for &gt; 1hr (can be left overnight). Thoroughly remove the poly-l-lysine by rinsing in artificial seawater (ASW) 4-5 times. After removing the last rinse, add 2 mls of 50% L15 (supplemented with salts and containing L-glutamine at a final concentration...

<ol>
	<li>Kandel, E. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+molecular+biology+of+memory+storage:+a+dialogue+between+genes+and+synapses.">The molecular biology of memory storage: a dialogue between genes and synapses.</a> Science. 294 (5544), 1030-1038 (2001).</li><li>Rayport, S. G., Schacher, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synaptic+plasticity+in+vitro:+cell+culture+of+identified+Aplysia+neurons+mediating+short-term+habituation+and+sensitization.">Synaptic plasticity in vitro: cell culture of identified Aplysia neurons mediating short-term habituation and sensitization.</a> J Neurosci. 6 (3), 759-763 (1986).</li><li>Goldberg, D. J., Schacher, S., Banker, G., Goslin, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Culturing Nerve Cells. , 213-236 (1998).</li><li>Glanzman, D. L., Kandel, E. R., Schacher, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identified+target+motor+neuron+regulates+neurite+outgrowth+and+synapse+formation+of+aplysia+sensory+neurons+in+vitro.">Identified target motor neuron regulates neurite outgrowth and synapse formation of aplysia sensory neurons in vitro.</a> Neuron. 3 (4), 441-450 (1989).</li><li>Lyles, V., Zhao, Y., Martin, K. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synapse+formation+and+mRNA+localization+in+cultured+Aplysia+neurons.">Synapse formation and mRNA localization in cultured Aplysia neurons.</a> Neuron. 49 (3), 349-356 (2006).</li><li>Martin, K. C., Casadio, A., Zhu, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synapse-specific,+long-term+facilitation+of+aplysia+sensory+to+motor+synapses:+a+function+for+local+protein+synthesis+in+memory+storage.">Synapse-specific, long-term facilitation of aplysia sensory to motor synapses: a function for local protein synthesis in memory storage.</a> Cell. 91 (7), 927-938 (1997).</li><li>Guan, Z., Giustetto, M., Lomvardas, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Integration+of+long-term-memory-related+synaptic+plasticity+involves+bidirectional+regulation+of+gene+expression+and+chromatin+structure.">Integration of long-term-memory-related synaptic plasticity involves bidirectional regulation of gene expression and chromatin structure.</a> Cell. 111 (4), 483-493 (2002).</li></ol>

The successful preparation of Aplysia sensory-motor cultures has a somewhat slow learning curve, since it involves the development of fine motor skills associated with microdissection and manipulation of individual neurons viewed through a stereo-microscope. In our experience, it takes approximately 1-3 weeks of practice to obtain healthy isolated sensory neurons in culture and an additional 1-3 weeks to learn how to pair sensory neurons with motor neurons. We routinely prepare cultures in a Labconco Clean Bench...

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			Solutions needed for culture 
<ol>
 <li>0.35 M MgCl2, stored at room temperature, used for anesthesia.</li>
 <li>Poly-L-lysine solution, Sigma: P-1524, MW &gt;300,000, made in 0.1M Sodium Borate pH8.2 to 0.5mg/ml solution. Vortex well and filter sterilize through a 0.22 &mu;m filter, store it at 4C&deg;. Do not freeze-thaw.</li>
 <li>L-15 Medium powder (Leibovitz) (Sigma: L4386) supplemented with the salts as below to make 1 liter 
<table border="1" cellspacing="0" cellpadding="0">
 <tr>
 <td>L-15 powder</td>
 <td>13.8g</td>
 </tr>
 <tr>
 <td>NaCl</td>
 <td>15.4 g </td>
 </tr>
 <tr>
 <td>D-Glucose </td>
 <td>6.24 g </td>
 </tr>
 <tr>
 <td>MgSO4&#149;7H20 </td>
 <td>6.45g </td>
 </tr>
 <tr>
 <td>KCl </td>
 <td>350 mg </td>
 </tr>
 <tr>
 <td>NaHCO3</td>
 <td>170 mg </td>
 </tr>
 <tr>
 <td>MgCl2&#149;6H2O </td>
 <td>5.49 g </td>
 </tr>
 <tr>
 <td>CaCl2&#149;2H2O </td>
 <td>1.43g </td>
 </tr>
 <tr>
 <td>HEPES</td>
 <td>3.53g</td>
 </tr>
</table>

 Add ddH20 to 1 liter.&nbsp; The pH should be about 7.4-7.5, add 10ml of 100X Pen/Strep solution, and filter-sterilize through a 0.22 &#181;m filter. Store at 4C0 for no longer than 1 month.</li>
<li>Protease digestion solution: 1% Protease IX (1unit/mg) is made in L15 (supplemented with salts as above) or in ASW immediately before use, filter-sterilized through a 0.22 &#181;m Millipore. 5mls should be enough for the ganglia from two animals (make sure the ganglia are completely immersed in protease solution). Sigma has reported that they will discontinue selling Protease IX. A substitute protease is: Dispase II (Roche Applied Science catalog # 04942078001).</li>
<li>Culture medium.&nbsp; Immediately prior to preparing cultures, thaw a 10 ml aliquot of hemolymph and mix it with 10 mls of L15 (supplemented with salts as above) to make 20mls culture medium. Add 200 &mu;l of 200mM L- Glutamine, mix well and use for preparing cultures. This medium should be prepared fresh each time cultures are made.</li>
<li>Artificial Seawater can be made from Instant Ocean (Aquarium Systems, Mentor, OH) or as follows: 450 mM NaCl, 10 mM KCl, 30 mM MgCl2(6H2O), 20 mM MgSO4, 10 mM CaCl2(2H2O), 10 mM HEPES, with pH adjusted to 7.4.</li></ol>		</div>

preparation of aplysia sensory-motor neuronal cell cultures

The nervous system of the marine mollusk Aplysia californica is relatively simple, consisting of approximately 20,000 neurons. The neurons are large (up to 1 mm in diameter) and identifiable, with distinct sizes, shapes, positions and pigmentations, and the cell bodies are externally exposed in five paired ganglia distributed throughout the body of the animal. These properties have allowed investigators to delineate the circuitry underlying specific behaviors in the animal1. The monosynaptic connection between sensory and motor neurons is a central component of the gill-withdrawal reflex in the animal, a simple defensive reflex in which the animal withdraws its gill in response to tactile stimulation of the siphon. This reflex undergoes forms of non-associative and associative learning, including sensitization, habituation and classical conditioning. Of particular benefit to the study of synaptic plasticity, the sensory-motor synapse can be reconstituted in culture, where well-characterized stimuli elicit forms of plasticity that have direct correlates in the behavior of the animal2,3. Specifically, application of serotonin produces a synaptic strengthening that, depending on the application protocol, lasts for minutes (short-term facilitation), hours (intermediate-term facilitation) or days (long-term facilitation). In contrast, application of the peptide transmitter FMRFamide produces a synaptic weakening or depression that, depending on the application protocol, can last from minutes to days (long-term depression). The large size of the neurons allows for repeated sharp electrode recording of synaptic strength over periods of days together with microinjection of expression vectors, siRNAs and other compounds to target specific signaling cascades and molecules and thereby identify the molecular and cell biological steps that underlie the changes in synaptic efficacy.
An additional advantage of the Aplysia culture system comes from the fact that the neurons demonstrate synapse-specificity in culture4,5. Thus, sensory neurons do not form synapses with themselves (autapses) or with other sensory neurons, nor do they form synapses with non-target identified motor neurons in culture. The varicosities, sites of synaptic contact between sensory and motor neurons, are large enough (2-7 microns in diameter) to allow synapse formation (as well as changes in synaptic morphology) with target motor neurons to be studied at the light microscopic level.
In this video, we demonstrate each step of preparing sensory-motor neuron cultures, including anesthetizing adult and juvenile Aplysia, dissecting their ganglia, protease digestion of the ganglia, removal of the connective tissue by microdissection, identification of both sensory and motor neurons and removal of each cell type by microdissection, plating of the motor neuron, addition of the sensory neuron and manipulation of the sensory neurite to form contact with the cultured motor neuron.

Watch this Scientific Journal Video about Preparation of Aplysia Sensory-motor Neuronal Cell Cultures at JoVE.com

Preparation of Aplysia Sensory-motor Neuronal Cell Cultures

Primary cultures of Aplysia sensory-motor neurons provide a model preparation for studying synapse formation and synaptic plasticity in vitro. This video demonstrates the identification and microdissection of sensory and motor neurons from Aplysia ganglia as well as the methods for establishing and maintaining sensory-motor neurons in culture.

Preparation of Aplysia Sensory-motor Neuronal Cell Cultures

The nervous system of the marine mollusk Aplysia californica is relatively simple, consisting of approximately 20,000 neurons.  The neurons are large (up ...

preparation-of-aplysia-sensory-motor-neuronal-cell-cultures

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JoVE Journal

Biology

15.9K 조회수.  University of California, Los Angeles. 의 주요 문화 Aplysia 감각 - 모터 뉴런은 버렸네 형성하고 시냅스 소성을 연구를위한 모델 준비를 제공합니다 체외에서. 이 비디오에서 감각 및 운동 신경의 식별 및 microdissection을 보여 Aplysia 신경뿐만 아니라 문화의 감각 - 모터 뉴런을 설정하고 관리하기위한 방법.