Decreased retinal blood flow in experimental colitis; improvement by eye drop administration of losartan.

Abstract:

:Patients with inflammatory bowel disease suffer not only from gut inflammation, but also from extraintestinal manifestations of the disease, including ocular pathology. The mechanisms causing ocular inflammation in these patients are unknown. The purpose of the current study was to investigate the possible vascular changes occurring in the retina using a mouse model of acute colitis, that is, ingestion of dextran sodium sulfate (DSS). Intravital microscopy of anesthetized mice revealed that DSS caused a significant 30-40% decrease in retinal red blood cell velocities, and a 45% decrease in total retinal blood flow, but no changes in intraocular pressure. To determine whether the decreases in retinal perfusion could be inhibited by an angiotensin II receptor antagonist, losartan was administered by eye drops in a subset of the mice prior to the intravital microscopy measurements. Topical losartan was able to largely attenuate the altered hemodynamics induced by DSS. We conclude that angiotensin II might be a possible target for reducing the vascular changes occurring distantly in the eye during colitis.

journal_name

Exp Eye Res

authors

Watts MN,Eshaq RS,Carter PR,Harris NR

doi

10.1016/j.exer.2013.06.023

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

22-6

eissn

0014-4835

issn

1096-0007

pii

S0014-4835(13)00173-5

journal_volume

115

pub_type

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