Name: Forfatter Spotlight: Multimodale bildebehandlingsstrategier for optimalisering av medikamentlevering og tidlig oppdagelse i glioblastombehandling
Uploaded: 2024-03-01T14:15:00
Description: Watch this Scientific Journal Video about Two-Photon Intravital Microscopy of Glioblastoma in a Murine Model at JoVE.com

Vi vil gjerne takke Stanford Wu Tsai Neuroscience Microscopy Service, Stanford Center for Innovations in Vivo Imaging (SCi3) - small animal imaging center, NIH S10 Shared Instrumentation Grant (S10RR026917-01, PI Michael Moseley, Ph.D.), og Stanford Preclinical Imaging Facility på Porter Drive for å levere utstyr og infrastruktur for dette prosjektet. Dette arbeidet ble støttet av et tilskudd fra National Institute for Child Health and Human Development, tilskuddsnummer R01HD103638. Vi vil gjerne takke Schnitzer Group, Stanford University; Zuo-laboratoriet, Universitetet i Santa Cruz; og Neurovascular Imaging Laboratory, Boston Photonic Center, University of Boston, for pedagogiske diskusjoner om to-foton bildebehandling og kraniale vindusmodeller.

Dyreprosedyren beskrevet i denne protokollen er i samsvar med kravene fra Administrative Panel on Laboratory Animal Care (APLAC).
1. Cellekultur
<ol><li>Forberedelse av hette<ol><li>Vask hendene, bruk hansker og labfrakk. Slå på det biologiske sikkerhetsskapet og sett rammenivået til en passende åpningshøyde. La hetten rense i 3-5 min. Spray hetteområdet med 70% etanol og tørk det ned med silkepapir.</li>
		<li>Spray alle reagenser med 70% etanol og tørk av med silke...

Sanntidssporing av nanopartikler i hjernesvulster ved bruk av 2P-IVM i mus

<ol>
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H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-photon+microscopy+of+Paneth+cells+in+the+small+intestine+of+live+mice.">Two-photon microscopy of Paneth cells in the small intestine of live mice.</a> Sci Rep. 8 (1), 14174 (2018).</li><li>Ihler, F., Bertlich, M., Weiss, B., Dietzel, S., Canis, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-photon+microscopy+allows+imaging+and+characterization+of+cochlear+microvasculature+in+vivo.">Two-photon microscopy allows imaging and characterization of cochlear microvasculature in vivo.</a> Biomed Res Int. 2015, 154272 (2015).</li><li>Matsuura, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intravital+imaging+with+two-photon+microscopy+reveals+cellular+dynamics+in+the+ischeamia-reperfused+rat+heart.">Intravital imaging with two-photon microscopy reveals cellular dynamics in the ischeamia-reperfused rat heart.</a> Sci Rep. 8 (1), 15991 (2018).</li><li>Veres, T. Z., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intubation-free+in+vivo+imaging+of+the+tracheal+mucosa+using+two-photon+microscopy.">Intubation-free in vivo imaging of the tracheal mucosa using two-photon microscopy.</a> Sci Rep. 7 (1), 694 (2017).</li><li>Zong, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Large-scale+two-photon+calcium+imaging+in+freely+moving+mice.">Large-scale two-photon calcium imaging in freely moving mice.</a> Cell. 185 (7), 1240-1256.e30 (2022).</li><li>Takasaki, K., Abbasi-Asl, R., Waters, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Superficial+bound+of+the+depth+limit+of+two-photon+imaging+in+mouse+brain.">Superficial bound of the depth limit of two-photon imaging in mouse brain.</a> eNeuro. 17 (1), (2019).</li><li>Birkner, A., Konnerth, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Deep+two-photon+imaging+in+vivo+with+a+red-shifted+calcium+indicator.">Deep two-photon imaging in vivo with a red-shifted calcium indicator.</a> Methods Mol Biol. 1929, 15-26 (1929).</li><li>Busche, M. 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M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Treatment+with+cyclic+AMP+activators+reduces+glioblastoma+growth+and+invasion+as+assessed+by+two-photon+microscopy.">Treatment with cyclic AMP activators reduces glioblastoma growth and invasion as assessed by two-photon microscopy.</a> Cells. 10 (3), 556 (2021).</li><li>Jiang, L. W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Label-free+detection+of+fibrillar+collagen+deposition+associated+with+vascular+elements+in+glioblastoma+multiforme+by+using+multiphoton+microscopy.">Label-free detection of fibrillar collagen deposition associated with vascular elements in glioblastoma multiforme by using multiphoton microscopy.</a> J Microsc. 265 (2), 207-213 (2017).</li><li>Chen, Z., Ross, J. 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Vi presenterer en metode for sanntids in vivo NP-sporing ved bruk av 2P-IVM gjennom et kranialvindu for å evaluere tumortilførselen av fluorescerende merket jernoksid-NP. Den kirurgiske teknikken for denne prosedyren krever en stødig hånd og avanserte eksperimentelle kirurgiske ferdigheter. Det anbefales å øve på å bruke eller fantomer før du går videre til levende dyreopplevelse. Som et alternativ implementerte Hoeferlin et al. en robotbor for å redusere termisk skade, minimere kirurgisk teknikkvaria...

To-foton intravital mikroskopi (2P-IVM) er en fluorescensavbildningsteknikk som tillater visualisering av levende vev1.
Først utviklet på 1990-tallet, har 2P-IVM blitt brukt til in vivo-analyse av retina2, nyre3, tynntarm4, cochlea5, hjerte6, luftrør7 og hjernen i forskjellige prekliniske modeller 8,9. Innen nevrovitenskap har 2P-IVM fått betydning som en teknikk for sanntidsavbildning av den sunne hjernen i våkne dyr10, samt å studere sykdommer i nervesystemet som Alzheimers11, Parkinsons12 og glioblastom (GBM) 13,14,15,16.
2P-IVM tilbyr en elegant løsning for å studere tumormikromiljøet under utviklingen av GBM. Mens noen tidligere studier fokuserte på in vitro17 og ex vivo modeller18, implementerte andre ortotopisk19 og xenotropisk20 in vivo modeller for å undersøke GBM. Madden et al. utførte innfødt avbildning av CNS-1 rotte glioma cellelinje i en musemodell13. Ved hjelp av en ortotopisk GL261-DsRed murinmodell utførte Ricard et al. en intravenøs administrering av en fluorofor for å forbedre blodkarene i tumorområdet i 2P-IVM14.
Her bruker vi 2P-IVM for sporing av tumortilførsel av fluorescerende merkede jernoksidnanopartikler (NP) i en ortotopisk musemodell av GBM. Ved hjelp av et kranialvindu tillater denne metoden oss å studere sanntids spatiotemporal fordeling av NP i hjernen i detalj.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>0.9% sodium chloride infusion solution</td>
			<td>Baxter Corp</td>
			<td>533-JB1301P</td>
			<td></td>
		</tr>
		<tr>
			<td> 
			Dulbecco&#39;s Modified Eagle Medium</td>
			<td>Invitrogen</td>
			<td>11965-092</td>
			<td></td>
		</tr>
		<tr>
			<td>1 mL syringes</td>
			<td>BD</td>
			<td>Luer-Lok syringe, REF309628</td>
			<td></td>
		</tr>
		<tr>
			<td>10%&#160;FBS</td>
			<td>Thermo fisher</td>
			<td>Cytiva SH30910.03HI</td>
			<td></td>
		</tr>
		<tr>
			<td>10% DMSO</td>
			<td>Sigma-Aldrich</td>
			<td>D8418-50ML</td>
			<td></td>
		</tr>
		<tr>
			<td>2-photon microscope</td>
			<td>Prairie Technologies, Bruker</td>
			<td>Prairie Ultima IV</td>
			<td></td>
		</tr>
		<tr>
			<td>Alcohol applicators, 70%</td>
			<td>Medline Industries, LP</td>
			<td>MDS093810</td>
			<td></td>
		</tr>
		<tr>
			<td>Alcohol, spray bottle</td>
			<td>Decon Labs Inc</td>
			<td>Decon SaniHol, 04-355-122</td>
			<td></td>
		</tr>
		<tr>
			<td>Aluminum foil</td>
			<td>Reynold Brands</td>
			<td>Reynold Wrap non-stick aluminum foil</td>
			<td></td>
		</tr>
		<tr>
			<td>Anesthesia machine</td>
			<td>Patterson Scientific</td>
			<td>SAS3</td>
			<td></td>
		</tr>
		<tr>
			<td>Anesthesia monitoring&#160;</td>
			<td>Kent Scientific&#160;</td>
			<td>MouseSTAT Jr. Rodent Pulsoxymeter</td>
			<td></td>
		</tr>
		<tr>
			<td>Antibiotic-Antimycotic (100x), liquid</td>
			<td>Invitrogen</td>
			<td>15240-096</td>
			<td></td>
		</tr>
		<tr>
			<td>Betadine applicators</td>
			<td>Professional Disposables International, Inc</td>
			<td>S41125</td>
			<td></td>
		</tr>
		<tr>
			<td>Biopsy punch, 5 mm&#160;</td>
			<td>Miltex</td>
			<td>Size 5</td>
			<td></td>
		</tr>
		<tr>
			<td>Buprenorphine sustained release</td>
			<td>Zoo Pharm</td>
			<td>Bup SR Lab, 1.0 mg/mL</td>
			<td>A generic drug can be used instead.&#160;</td>
		</tr>
		<tr>
			<td>C6 rat glioma cell line</td>
			<td>ATCC (American Tissue Culture Collection)</td>
			<td>CCL-107</td>
			<td></td>
		</tr>
		<tr>
			<td>Cannulas</td>
			<td>BD</td>
			<td>16 G, 1.1/2&#8221;, 30 G, 1&#8221;</td>
			<td></td>
		</tr>
		<tr>
			<td>Carprofen</td>
			<td>Pfizer&#160;</td>
			<td>Rimadyl, 50 mg/ml</td>
			<td>A generic drug can be used instead.&#160;</td>
		</tr>
		<tr>
			<td>Cefazoline</td>
			<td>Sagent Pharmaceuticals</td>
			<td>25021-101-10, 1 g/vial</td>
			<td>A generic drug can be used instead.&#160;</td>
		</tr>
		<tr>
			<td>Cell strainer, 40 &#181;m</td>
			<td>Fisher Scientific</td>
			<td>87711</td>
			<td></td>
		</tr>
		<tr>
			<td>Cotton tip applicators, 6&#8221;&#160;</td>
			<td>Dyad Medical Sourcing, LLC</td>
			<td>HCS1005</td>
			<td></td>
		</tr>
		<tr>
			<td>Dental cement</td>
			<td>Stoelting Co</td>
			<td>51459</td>
			<td>Dental cement kit, clear, 2 components</td>
		</tr>
		<tr>
			<td>Dexamethasone</td>
			<td>Bimeda</td>
			<td>138RX, 2 mg/mL</td>
			<td>A generic drug can be used instead.&#160;</td>
		</tr>
		<tr>
			<td>DietGel</td>
			<td>ClearH2O</td>
			<td>Recovery, 72-06-502</td>
			<td></td>
		</tr>
		<tr>
			<td>Drape&#160;</td>
			<td>Cardinal Health</td>
			<td>Bio Shield Wrap</td>
			<td></td>
		</tr>
		<tr>
			<td>Drill</td>
			<td>Saeyang Microtech</td>
			<td>Escort Pro, B08350</td>
			<td></td>
		</tr>
		<tr>
			<td>Drill tips&#160;</td>
			<td>Hager &#38; Meissinger GmbH</td>
			<td>REF310104001001005</td>
			<td>Size 005, US 1/4</td>
		</tr>
		<tr>
			<td>FIJI imaging analysis software</td>
			<td>National Institute of Health</td>
			<td>https://imagej.net/software/fiji/</td>
			<td></td>
		</tr>
		<tr>
			<td>Forceps</td>
			<td>Fisher Scientific</td>
			<td>13-812-41</td>
			<td></td>
		</tr>
		<tr>
			<td>Gauze</td>
			<td>Fisher HealthCare</td>
			<td>Sterile Cotton Gauze Pad, 4 x 4&#8221;, 22-415-469</td>
			<td></td>
		</tr>
		<tr>
			<td>Gelfoam&#160;</td>
			<td>Ethicon Inc.&#160;</td>
			<td>Surgifoam absorbable gelatin sponge, Ref. 1972</td>
			<td></td>
		</tr>
		<tr>
			<td>Germinator&#160;</td>
			<td>Cellpoint Scientific&#160;</td>
			<td>Germinator 500, No. 11688</td>
			<td></td>
		</tr>
		<tr>
			<td>Glass coverslips, 5 mm diameter</td>
			<td>Fisher Scientific</td>
			<td>Menzel Cover glass&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Gloves, non-sterile</td>
			<td>Fisher Scientific</td>
			<td>Nitrile powder-free medical examination gloves</td>
			<td></td>
		</tr>
		<tr>
			<td>Gloves, sterile</td>
			<td>Medline Industries, LP</td>
			<td>MDS104070</td>
			<td></td>
		</tr>
		<tr>
			<td>Hair removal cream</td>
			<td>Church &#38; Dwight</td>
			<td>Nair Hair remover lotion&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Hamilton syringe</td>
			<td>Hamilton Company Inc</td>
			<td>Gastight #1701, 10 &#181;L</td>
			<td></td>
		</tr>
		<tr>
			<td>HBSS without Ca, Mg</td>
			<td>Fisher Scientific</td>
			<td>PI88284</td>
			<td></td>
		</tr>
		<tr>
			<td>Head bar</td>
			<td>Hongway</td>
			<td>5 mm inner diameter O-rings</td>
			<td></td>
		</tr>
		<tr>
			<td>Heating pad</td>
			<td>Stoelting Co.&#160;</td>
			<td>Rodent warmer X2</td>
			<td></td>
		</tr>
		<tr>
			<td>Insulin syringes</td>
			<td>Exel International Medical Products&#160;</td>
			<td>29G x 1/2&#8243;</td>
			<td></td>
		</tr>
		<tr>
			<td>Iron oxide nanoparticles</td>
			<td>Covis Pharma GmbH</td>
			<td>Feraheme ferumoxytol injection, 510 mg/17 mL, 59338077501</td>
			<td></td>
		</tr>
		<tr>
			<td>Isoflurane</td>
			<td>Dechra</td>
			<td>26675-46-7</td>
			<td></td>
		</tr>
		<tr>
			<td>Mice</td>
			<td>Jackson Laboratories</td>
			<td>NSG, Strain 005557</td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope (surgery)</td>
			<td>Seiler Medical</td>
			<td>Seiler IQ Q-100-220</td>
			<td></td>
		</tr>
		<tr>
			<td>Nanoparticles</td>
			<td>Custom</td>
			<td></td>
			<td>Iron oxide nanoparticles (Ferumoxytol) labeled with fluorescein isothiocyanate</td>
		</tr>
		<tr>
			<td>Ophtalmic ointment</td>
			<td>Major pharmaceuticals</td>
			<td>Lubrifresh P.M. nighttime ointment, 203964</td>
			<td></td>
		</tr>
		<tr>
			<td>Oxygen</td>
			<td>Linde Gas &#38; Equipment Inc.&#160;</td>
			<td>High Pressure Steel K Style Cylinder, 249CF, 2000PSIG, CGA 540</td>
			<td></td>
		</tr>
		<tr>
			<td>Plastic cups</td>
			<td>Georgia-Pacirif Consumer Products</td>
			<td>Dixie Portion Cup, 2 oz., Plastic, Clear, PK2400</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyethylene tubing</td>
			<td>Braintree Scientific</td>
			<td>50-195-5494</td>
			<td></td>
		</tr>
		<tr>
			<td>Scale</td>
			<td>Ohaus Corp</td>
			<td>CR2200</td>
			<td></td>
		</tr>
		<tr>
			<td>Scalpel</td>
			<td>Integra Life Sciences Production Corp</td>
			<td>Integra Miltex Stainless steel disposable scalpel</td>
			<td></td>
		</tr>
		<tr>
			<td>Scissors</td>
			<td>Fisher Scientific</td>
			<td>13-804-18</td>
			<td></td>
		</tr>
		<tr>
			<td>Sealant</td>
			<td>Henkel Corp</td>
			<td>Loctite 4014</td>
			<td></td>
		</tr>
		<tr>
			<td>Single use lab gown</td>
			<td>High Tech Conversions</td>
			<td>17-444-081</td>
			<td></td>
		</tr>
		<tr>
			<td>Stereotactic frame</td>
			<td>Stoelting Co.&#160;</td>
			<td>Stoelting New Standard TM</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile Vacuum Bottle Top Filtration Systems</td>
			<td>Fisher Scientific</td>
			<td>S2GPU05RE, MilliporeSigma NO.:S2GPU05RE</td>
			<td></td>
		</tr>
		<tr>
			<td>Styrofoam box</td>
			<td>N/A</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical gloves</td>
			<td>Cardinal Health</td>
			<td>19-163-108</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical glue, 3M Vetbond tissues adhesive</td>
			<td>3M Animal Care Prodcuts</td>
			<td>1469SB</td>
			<td></td>
		</tr>
		<tr>
			<td>Tail vein cathether</td>
			<td>Custom</td>
			<td></td>
			<td>Consists of two 30 G cannulas connected with sillicone tubing&#160;</td>
		</tr>
		<tr>
			<td>TrypLE Express (1x), no phenol red</td>
			<td>Invitrogen</td>
			<td>12604-039</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultraviolett torch</td>
			<td>Spring sunshine technology</td>
			<td>Consciot</td>
			<td></td>
		</tr>
	</tbody>
</table>

two-photon intravital microscopy of glioblastoma in a murine model

Levering av intravenøst administrert kreftbehandling til hjernesvulster er begrenset av blod-hjernebarrieren. En metode for å direkte avbilde akkumulering og distribusjon av makromolekyler i hjernesvulster in vivo vil i stor grad forbedre vår evne til å forstå og optimalisere legemiddellevering i prekliniske modeller. Denne protokollen beskriver en metode for sanntids in vivo-sporing av intravenøst administrerte fluorescerende merkede nanopartikler med to-foton intravital mikroskopi (2P-IVM) i en musemodell av glioblastom (GBM).
Protokollen inneholder en flertrinnsbeskrivelse av prosedyren, inkludert anestesi og analgesi av forsøksdyr, skape et kranialvindu, GBM-celleimplantasjon, plassere en hodestang, gjennomføre 2P-IVM-studier og postkirurgisk behandling for langsiktige oppfølgingsstudier. Vi viser representative 2P-IVM-bildebehandlingsøkter og bildeanalyse, undersøker fordelene og ulempene ved denne teknologien, og diskuterer potensielle applikasjoner.
Denne metoden kan enkelt modifiseres og tilpasses ulike forskningsspørsmål innen in vivo preklinisk hjerneavbildning.

Two-photon intravital microscopy (2P-IVM) is a fluorescence imaging technique that allows the visualization of living tissue1.
First developed in the 1990s, 2P-IVM has been used for in vivo analysis of the retina2, kidney3, small intestine4, cochlea5, heart6, trachea7, and the brain in various preclinical models8,9. In the field of neuroscience, 2P-IVM has gained importance as a technique for real-time imaging of the healthy brain in awake animals10, as well as studying diseases of the nervous system such as Alzheimer&#39;s11, Parkinson&#39;s12 and glioblastoma (GBM)13,14,15,16.
2P-IVM offers an elegant solution for studying the tumor microenvironment during the development of GBM. While some previous studies focused on in vitro17 and ex vivo models18, others implemented orthotopic19 and xenotropic20&#160;in vivo models for examining GBM. Madden et al. performed native imaging of CNS-1 rat glioma cell line in a mouse model13. Using an orthotopic GL261-DsRed murine model, Ricard et al. performed an intravenous administration of a fluorophore to enhance the blood vessels in the tumor region in 2P-IVM14.
Here, we apply 2P-IVM for tracking the tumor delivery of fluorescent-labeled iron oxide nanoparticles (NP) in an orthotopic mouse model of GBM. Using a cranial window, this method allows us to study the real-time spatiotemporal distribution of NPs in the brain in detail.

Forfatter Spotlight: Multimodale bildebehandlingsstrategier for optimalisering av medikamentlevering og tidlig oppdagelse i glioblastombehandling

To-foton intravital mikroskopi av glioblastom i en murinmodell

Glioblastoma is one of the most common primary brain cancer and is associated with fast growth and poor life expectancy. Developing effective therapies for glioblastoma remains a major challenge since the delivery of therapeutics is limited by the blood brain barrier. A method to directly image the accumulation and distribution of macromolecules in the brain would greatly enhance our ability to understand and optimize drug delivery.Two-photon microscopy offers an elegant solution for studying the real-time distribution of nanoparticles in the preclinical model of glioblastoma. By modifying the nanoparticle used in this study, it's possible to investigate the delivery of different drug candidates and combination therapies on a cellular and molecular level. In addition to two-photon intravital microscopy, the iron oxide component of these nanoparticles allow for multimodal imaging with MRI or MPI.For the future, imaging facilities could serve in the realization of early detection to cancer, thereby leading to more effective therapies against malignant neoplasia. One path to achieve this is to merge two-photon intravital microscopy with other imaging modalities such as positron emission tomography and photoacoustic ultrasound.

Her utførte vi kranialvinduskirurgi og enpoderte C6-celler i en NSG-musemodell av GBM (n = 5). En riktig forsegling mellom alle komponentene som er involvert i opprettelsen av vinduet (figur 1A) vil sikre vinduenes holdbarhet for langtidsavbildning og i tillegg redusere sykelighet. Ved å bruke scenen tilpasset in vivo 2P-IVM (figur 2), kunne vi avbilde dyr under anestesi i opptil 2 timer uten store bevegelsesartefakter. Omtrent 10 minutter etter intra...

Watch this Scientific Journal Video about Two-Photon Intravital Microscopy of Glioblastoma in a Murine Model at JoVE.com

Vi presenterer en ny tilnærming for to-foton mikroskopi av tumortilførselen av fluorescerende merkede jernoksid nanopartikler til glioblastom i en musemodell.

The delivery of intravenously administered cancer therapeutics to brain tumors is limited by the blood-brain barrier. A method to directly image the ...

Glioblastom er en av de vanligste primære hjernekreft og er forbundet med rask vekst og dårlig forventet levealder. Utvikling av effektive terapier for glioblastom er fortsatt en stor utfordring siden levering av terapeutiske midler er begrenset av blodhjernebarrieren. En metode for å direkte avbilde akkumulering og distribusjon av makromolekyler i hjernen vil i stor grad forbedre vår evne til å forstå og optimalisere medikamentlevering.To-foton mikroskopi gir en elegant løsning for å studere sanntidsfordelingen av nanopartikler i den prekliniske modellen av glioblastom. Ved å modifisere nanopartikkelen som brukes i denne studien, er det mulig å undersøke levering av forskjellige legemiddelkandidater og kombinasjonsterapier på cellulært og molekylært nivå. I tillegg til to-foton intravital mikroskopi tillater jernoksydkomponenten i disse nanopartiklene multimodal avbildning med MR eller MPI.For fremtiden kan bildebehandlingsanlegg tjene til å realisere tidlig påvisning av kreft, og dermed føre til mer effektive terapier mot ondartet neoplasi. En vei for å oppnå dette er å fusjonere to-foton intravital mikroskopi med andre bildebehandlingsmodaliteter som positronemisjonstomografi og fotoakustisk ultralyd.

two-photon-intravital-microscopy-of-glioblastoma-in-a-murine-model

Research

JoVE Journal

Cancer Research

Two-Photon Intravital Microscopy of Glioblastoma in a Murine Model

The delivery of intravenously administered cancer therapeutics to brain tumors is limited by the blood-brain barrier. A method to directly image the accumulation and distribution of macromolecules in brain tumors in vivo would greatly enhance our ability to understand and optimize drug delivery in preclinical models. This protocol describes a method for real-time in vivo tracking of intravenously administered fluorescent-labeled nanoparticles with two-photon intravital microscopy (2P-IVM) in a mouse model of glioblastoma (GBM).
The protocol contains a multi-step description of the procedure, including anesthesia and analgesia of experimental animals, creating a cranial window, GBM cell implantation, placing a head bar, conducting 2P-IVM studies, and post-surgical care for long-term follow-up studies. We show representative 2P-IVM imaging sessions and image analysis, examine the advantages and disadvantages of this technology, and discuss potential applications.
This method can be easily modified and adapted for different research questions in the field of in vivo preclinical brain imaging.

We present a novel approach for two-photon microscopy of the tumor delivery of fluorescent-labeled iron oxide nanoparticles to glioblastoma in a mouse model.