Linked Life Data

12062190

Source:http://linkedlifedata.com/resource/pubmed/id/12062190

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2002-6-13
pubmed:abstractText
The purpose of this study was to measure the intraretinal oxygen distribution across the retina under conditions, which maximise outer retinal oxygen consumption. In particular, we looked for evidence of increased oxygen delivery from the choroid and the deep retinal capillary layer, and whether or not this was sufficient to avoid the development of intraretinal anoxia. Under dark-adapted conditions the photoreceptors need additional energy, at least part of which is derived from increased oxidative metabolism. In earlier studies in the cat retina it was revealed that dark adaptation could render some regions of the outer retina anoxic. The present study of the in vivo oxygen distribution across the rat retina in light and dark found no evidence of outer retinal anoxia in the dark. This was despite a mean increase of 52.6+/-11.4% (n=7) in outer retinal oxygen consumption in the dark. The mean value for the minimum outer retinal PO(2) in the dark was 5.2+1.2 mmHg. Oxygen delivery from both the choroid and the deep retinal capillary layer increased in the dark (P<0.01, and P<0.001, respectively). It is argued that the ability of the deep capillary layer to compensate for changes in oxygen demand in the outer retina is an important element in the maintenance of homeostasis in the retina. This is in addition to the role of the deep capillary layer in supplying oxygen to the highly consuming plexiform layers within the inner retina. These findings in the rat retina also demonstrate that intraretinal anoxia in the dark, is not, as implied by earlier work in the cat, a general feature of mammalian retinas.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1095-6433
pubmed:author
pubmed:issnType
Print
pubmed:volume
132
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
47-52
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Outer retinal anoxia during dark adaptation is not a general property of mammalian retinas.
pubmed:affiliation
Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Western Australia. dyyu@cyllene.uwa.edu.au
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't