Linked Life Data

11399895

Source:http://linkedlifedata.com/resource/pubmed/id/11399895

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2001-6-11
pubmed:abstractText
Spontaneously hypertensive rats (SHRs) have elevated numbers of apoptotic cells. However, the extent and pattern of cell death at the microvascular level is unexplored. We developed a technique to determine early forms of cell death in vivo in the mesentery by use of the life/death indicator ethidium bromide (EB). The mesenteric microvasculature was superfused with 5 microM EB for a period of 3 min, rinsed and immediately viewed by digital fluorescence microscopy. EB-positive cell structures were observed both in the wall of microvessels as well as in the tissue parenchyma. The microvessels had about 2--4 EB-positive cell structures per 100 microm of vessel length. Larger arterioles (>25 microm) in the SHR had an increased EB-positive structure density. After normalization of the blood pressure in the SHR with adrenalectomy, no significant differences remained between Wistar-Kyoto (WKY) rats and SHRs. After dexamethasone treatment, the adrenalectomized SHRs had a higher EB-positive cell density in the smaller class of microvessels than the WKY rats. In addition, EB-positive cell fragments (0.5--2 microm) were observed in the mesentery microvessel wall, and with TUNEL labeling, they were demonstrated to represent DNA fragments. The percentage of microvessels with EB-positive fragments was higher in the SHR arterioles and capillaries. Capillaries and larger venules (>30 microm) in the SHR had higher levels of cell fragments per vessel length. After adrenalectomy, no significant differences remained between WKY rats and SHRs in any of the microvessel categories. When adrenalectomized rats were treated with dexamethasone, a higher number of EB-positive fragments was detected in the wall of SHR capillaries. These results indicate that the mesentery microcirculation in both strains is subject to an early and nonuniform pattern of cell death, as detected by EB, but is enhanced in selected individual microvascular segments of the SHR by a glucocorticoid-driven mechanism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1018-1172
pubmed:author
pubmed:copyrightInfo
Copyright 2001 S. Karger AG, Basel
pubmed:issnType
Print
pubmed:volume
38
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
228-36
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:articleTitle
Life and death cell labeling in the microcirculation of the spontaneously hypertensive rat.
pubmed:affiliation
Department of Bioengineering, The Whitaker Institute for Biomedical Engineering, University of California, San Diego, La Jolla, CA 92093-0412, USA.
pubmed:publicationType
Journal Article, Comparative Study