JoVE Journal > Medicine
Summary
Abstract
Introduction
Protocol
Results
Discussion
Disclosures
Acknowledgements
Materials
References
자동 번역
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의학

Un modello murino di lesione retinica ischemica indotta dall'occlusione dell'arteria carotide comune transiente

Published: November 12, 2020
doi:
10.3791/61865
, , , , , ,
1Laboratory of Photobiology,Keio University School of Medicine, 2Department of Ophthalmology,Keio University School of Medicine, 3Animal eye care,Tokyo Animal Eye Clinic, 4Tsubota Laboratory, Inc.

Summary

Qui, descriviamo un modello di topo di ischemia retinica mediante occlusione bilaterale transitoria comune dell’arteria carotide usando suture semplici e un morsetto. Questo modello può essere utile per comprendere i meccanismi patologici dell’ischemia retinica causati da anomalie cardiovascolari.

Abstract

Diverse malattie vascolari come la retinopatia diabetica, l’occlusione delle vene o delle arterie retiniche e la sindrome ischemica oculare possono portare all’ischemia retinica. Per studiare i meccanismi patologici dell’ischemia retinica, è necessario sviluppare modelli sperimentali pertinenti. Anatomicamente, un principale vaso di alimentazione del sangue retinica è l’arteria oftalmica (OpA) e OpA ha origine dall’arteria carotide interna della comune arteria carotide (CCA). Pertanto, l’interruzione del CCA potrebbe effettivamente causare ischemia retinica. Qui, abbiamo stabilito un modello di topo di ischemia retinica mediante occlusione dell’arteria carotide comune bilaterale transitoria (tBCCAO) per legare il CCA destro con suture di seta 6-0 e per occludere il CCA sinistro transitoriamente per 2 secondi tramite un morsetto, e abbiamo dimostrato che tBCCAO potrebbe indurre ischemia retinica acuta che porta alla disfunzione retinica. L’attuale metodo riduce la dipendenza dagli strumenti chirurgici utilizzando solo aghi chirurgici e un morsetto, riduce i tempi di occlusione per ridurre al minimo la morte animale inaspettata, che è spesso vista nei modelli di topo dell’occlusione dell’arteria cerebrale media e mantiene la riproducibilità dei comuni risultati ischemici retinali. Il modello può essere utilizzato per studiare la fisiopatologia delle retinopatie ischemiche nei topi e ulteriormente può essere utilizzato per lo screening in vivo dei farmaci.

Introduction

La retina è un tessuto neurosensoriale per la funzione visiva. Poiché è necessaria una notevole quantità di ossigeno per la funzione visiva, la retina è conosciuta come uno dei tessuti più esigenti di ossigeno nel corpo1. La retina è suscettibile alle malattie vascolari poiché l’ossigeno viene fornito attraverso i vasi sanguigni. Vari tipi di malattie vascolari, come la retinopatia diabetica e il vaso sanguigno retinale (vene o arterie) occlusione, possono indurre ischemia retinica. Per studiare i meccanismi patologici dell’ischemia retinica, sono considerati necessari modelli sperimentali riproducibili e clinicamente rilevanti di ischemia retinica. L’occlusione dell’arteria cerebrale media (MCAO) mediante inserimento di un filamento intraluminale è il metodo più generalmente utilizzato per lo sviluppo di modelli di roditori in vivo di ischemia cerebrale sperimentale2,3. A causa della vicinanza dell’arteria oftalmica (OpA) a MCA, i modelli MCAO vengono utilizzati anche contemporaneamente per comprendere la fisiopatologia dell’ischemia retinica4,5,6. Per indurre l’ischemia cerebrale insieme all’ischemia retinica, i filamenti lunghi vengono tipicamente inseriti attraverso l’incisione della comune arteria carotide (CCA) o dell’arteria carotide esterna (ECA). Questi metodi sono difficili da eseguire, richiedono molto tempo per completare l’intervento chirurgico (oltre 60 minuti per un topo) e portano ad alte variabilità nei risultati dopo l’interventochirurgico 7. Resta importante sviluppare un modello migliore per migliorare tali preoccupazioni.

In questo studio, abbiamo semplicemente usato breve occlusione bilaterale CCA transitoria (tBCCAO) con aghi e un morsetto per indurre l’ischemia retinica nei topi e analizzato i risultati tipici delle lesioni ischemiche nella retina. In questo video, daremo una dimostrazione della procedura tBCCAO.

Protocol

Tutti i metodi qui descritti sono stati approvati dall’Institutional Animal Care and Use Committee (IACUC) della Keio University School of Medicine. 1. Preparazione di strumenti chirurgici e animali Autoclave strumenti chirurgici e tenerli in 70% alcol etilico. Prima di ogni nuova procedura chirurgica, pulire accuratamente gli strumenti chirurgici utilizzando il 70% di alcol etilico. Preparare topi BALB/cAJc1 maschi (6 settimane, 26-28 kg) in una stanza priva di agenti pato…

Representative Results

Dopo la circolazione sistemica del FITC-dextran per 2 minuti, sono state esaminate le vasculure retiniche delle retine sinistra e destra nei topi azionati da sham e nei topi azionati da tBCCAO (Figura complementare 1). Fitc-dextran era completamente visibile sia nelle retine nei topi a farsa che nella retina sinistra nei topi azionati da tBCCAO, mentre era parzialmente rilevabile nella retina destra nei topi azionati da tBCCAO. Dopo il tBCCAO, è stato esaminato lo sbavatura d…

Discussion

Nello studio, abbiamo dimostrato che il tBCCAO, utilizzando suture semplici e un morsetto, potrebbe indurre ischemia retinica e conseguente disfunzione retinica. Inoltre, abbiamo dimostrato che il nostro attuale protocollo per lo sviluppo di un modello di topo di ischemia retinica è più facile e veloce rispetto ad altri protocolli precedenti per lo sviluppo di modelli di lesioni ischemiche retiniche2,3,7.

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Disclosures

The authors have nothing to disclose.

Acknowledgements

Questo lavoro è stato supportato da Grants-in-Aid for Scientific Research (KAKENHI) (18K09424 a Toshihide Kurihara e 20K18393 a Yukihiro Miwa) del Ministero dell’Istruzione, della Cultura, dello Sport, della Scienza e della Tecnologia (MEXT).

Materials

Atipamezole hydrochloride Zenoaq Antisedan For anti-anesthesia
Applied Biosystems 7500 Fast Applied Biosystems – For qPCR
Butorphanol tartrate Meiji Seika Pharma Vetorphale For anesthesia
BZ-II Analyzer KEYENCE – For an image merge
BALB/cAJc1 CLEA – Mouse strain
β-Actin (8H10D10) Mouse mAb CST 3700 For western blot
Clamp Forcep World Precision Instruments WPI 500451 For surgery
Dumont forceps #5 Fine Science Tools 11251-10 For surgery
DAPI solution Dojindo 340-07971 For IHC
Envisu SD-OCT system Leica R4310 For OCT
FITC-dextran Merk FD2000S For retinal blood perfusion
Fluorescence microscope KEYENCE BZ-9000 For fluorescence detection
Gatifloxacin hydrate Senju Pharmaceutical Gachifuro For anti-bacterial infection
GFAP Monoclonal Antibody (2.2B10) Thermo 13-0300 For IHC
Heating pad Marukan RH-200 For surgery
HIF-1α (D1S7W) XP Rabbit mAb CST 36169 For western blot
ImageQuant LAS 4000 mini GE Healthcare – For chemiluminescence
Midazolam Sandoz K.K SANDOZ For anesthesia
Microtome Tissue-Tek TEC 6 Sakura – For sectioning
Medetomidine Orion Corporation Domitor For anesthesia
Needle holder Handaya HS-2307 For surgery
PuREC MAYO Corporation – For ERG
Scissor Fine Science Tools 91460-11 For surgery
Sodium hyaluronate Santen Pharmaceutical Hyalein For eye lubrication
Tropicamide/Penylephrine hydrochloride Santen Pharmaceutical Mydrin-P For mydriasis
6-0 silk suture Natsume E12-60N2 For surgery
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Tags

Ischemic Retinal InjuryTransient Bilateral Common Carotid Artery OcclusionMurine ModelRetinal IschemiaPathophysiologyIschemic RetinopathiesIn Vivo Drug ScreeningVascular DiseasesDiabetic RetinopathyOcclusion Of Retinal Veins Or ArteriesOcular Ischemic SyndromeBALB/c MiceEyelid Drooping

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Lee, D., Miwa, Y., Jeong, H., Ikeda, S., Katada, Y., Tsubota, K., Kurihara, T. A Murine Model of Ischemic Retinal Injury Induced by Transient Bilateral Common Carotid Artery Occlusion. J. Vis. Exp. (165), e61865, doi:10.3791/61865 (2020).
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