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Summary

Abstract

Introduction

Protocol

Representative Results

Discussion

Acknowledgements

Materials

References

Neuroscience

Justering af optisk kohærenstomografi i synligt lys med konfokale billeder af samme musenethinde

Published: June 30th, 2023

DOI:

10.3791/65237

1Department of Biology, University of Virginia, 2Department of Biomedical Engineering, Northwestern University, 3Department of Ophthalmology, University of Virginia, 4Program in Fundamental Neuroscience, University of Virginia, 5Department of Psychology, University of Virginia

Denne protokol skitserer trinnene til justering af in vivo optisk kohærenstomografi i synligt lys (vis-OCTF) billeder med ex vivo konfokale billeder af samme musenethinde med det formål at verificere den observerede retinale ganglioncelleaxonbundtmorfologi i in vivo-billederne.

I de senere år er in vivo retinal billeddannelse, som giver ikke-invasiv, realtid og langsgående information om biologiske systemer og processer, i stigende grad blevet anvendt til at opnå en objektiv vurdering af neurale skader i øjensygdomme. Ex vivo konfokal billeddannelse af den samme nethinden er ofte nødvendig for at validere in vivo fund, især i dyreforsøg. I denne undersøgelse demonstrerede vi en metode til at justere et ex vivo konfokal billede af musens nethinde med dets in vivo-billeder . En ny klinisk klar billeddannelsesteknologi kaldet synligt lys optisk kohærenstomografi fibergrafi (vis-OCTF) blev anvendt til at erhverve in vivo-billeder af musens nethinden. Vi udførte derefter den konfokale billeddannelse af den samme nethinde som "guldstandarden" for at validere in vivo vis-OCTF-billederne. Denne undersøgelse muliggør ikke kun yderligere undersøgelse af de molekylære og cellulære mekanismer, men etablerer også et fundament for en følsom og objektiv evaluering af neurale skader in vivo.

Retinale ganglionceller (RGC'er) spiller en kritisk rolle i visuel informationsbehandling, modtager synaptiske input gennem deres dendritiske træer i det indre plexiformlag (IPL) og transmitterer informationen via deres axoner i retinale nervefiberlag (RNFL) til hjernen 1,2,3,4. Ved syge tilstande som glaukom kan tidlig RGC-degeneration resultere i subtile ændringer i RNFL, ganglioncellelaget (GCL), IPL og synsnerven hos både patienter og gnavermodeller 5,6,7,8,9.

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Alle dyreforsøg blev godkendt af Institutional Animal Care and Use Committee ved University of Virginia og i overensstemmelse med retningslinjen om brug af dyr fra National Institute of Health (NIH). Se materialefortegnelsen for detaljer vedrørende alle materialer, reagenser og instrumenter, der anvendes i denne protokol.

1. In vivo i forhold til OLT-billeddannelse

  1. Forholdet mellem de oversøiske lande og territorier (OLT)
    1. Tag bille.......

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Det sammensatte vis-OCT-fibergram sammenlignes med det tilsvarende konfokale billede af fladmonteret nethindeimmunfarvet med Tuj-1 for RGC-axoner (figur 1D, toppanel). Axonbundter afbildet af vis-OCTF kan matches med de Tu-j1-mærkede axonbundter på det konfokale billede. Blodkar udviser normalt skelnelige forgreningsstrukturer sammenlignet med omgivende axonbundter i fibergrambilleder, som kan matches med ICAM-2-mærkede blodkar på det konfokale billede (figur 1D

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Der er to trin i denne protokol, der kræver opmærksomhed. For det første er det nødvendigt at sikre, at dyret er under dyb anæstesi, og at deres øjne er fuldt udvidede inden vis-OCT-billeddannelse. Hvis musene ikke bedøves tilstrækkeligt, kan deres hurtige vejrtrækning føre til ustabile bevægelser af ansigtsbillederne , hvilket kan påvirke fibergrammets kvalitet negativt. Desuden kan utilstrækkelig udvidelse også have en negativ indvirkning på billedkvaliteten, da iris kan blokere lyset og forhind.......

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Denne undersøgelse er støttet af Glaucoma Research Foundation Shaffer Grant, 4-CA Cavalier Collaborative Award, R01EY029121, R01EY035088 og Knights Templar Eye Foundation.

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NameCompanyCatalog NumberComments
Equipment
Halo 100Opticent Health, Evanston, IL
Zeiss LSM800 microscopeCarl Zeiss
Drugs and antibodies
4% paraformaldehyde (PFA)Santz Cruz Biotechnology, SC-2816921-2 drops
Bovine serum albumin powderFisher Scientific, BP9706-1001:10
Donkey anti Mouse Alexa Fluor 488 dyeThermo Fisher Scientific, Cat# A-212021:1,000
Donkey anti rat Alexa Fluor 594 dyeThermo Fisher Scientific, Cat# A-212091:1,000
Euthasol (a mixture of pentobarbital sodium (390 mg/mL) and phenytoin sodium (50 mg/mL))Covetrus, NDC 11695-4860-115.6 mg/mL
KetamineCovetrus, NADA043304114 mg/kg
Mouse anti-Tuj1A gift from Anthony J. Spano, University of Virginia1:200
Normal donkey serum(NDS)Millipore Sigma, S30-100 mL1:100
Phosphate-buffered saline (PBS, 10x), pH 7.4
(Contains 1370 mM NaCl, 27 mM KCl, 80 mM Na2HPO4, and 20 mM KH2PO4)
Thermo Fisher Scientific, Cat# J62036.K31:10
Rat anti-ICAM-2BD Pharmingen, Cat#5533251:500
Tropicamide drops Covetrus, NDC17478-102-12
Triton X-100
(Reagent Grade)
VWR, CAS: 9002-93-11:20
Vectashield mounting mediumVector Laboratories Inc. H2000-10
XylazineCovetrus, NDC59399-110-2017 mg/kg

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