Linked Life Data

21346149

Source:http://linkedlifedata.com/resource/pubmed/id/21346149

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2011-5-27
pubmed:abstractText
We questioned how tight junctions contribute to intestinal barrier function during the cell shedding that is part of physiological cell renewal. Intravital confocal microscopy studied the jejunal villus epithelium of mice expressing a fluorescent zonula occludens 1 (ZO-1) fusion protein. Vital staining also visualized the cell nucleus (Hoechst staining) or local permeability to luminal constituents (Lucifer Yellow; LY). In a cell fated to be shed, ZO-1 redistributes from the tight junction toward the apical and then basolateral cell region. ZO-1 rearrangement occurs 15 ± 6 min (n = 28) before movement of the cell nucleus from the epithelial layer. During cell extrusion, permeation of luminal LY extends along the lateral intercellular spaces of the shedding cell only as far as the location of ZO-1. Within 3 min after detachment from the epithelial layer, nuclear chromatin condenses. After cell loss, a residual patch of ZO-1 remains in the space previously occupied by the departed cell, and the size of the patch shrinks to 14 ± 2% (n = 15) of the original cell space over 20 min. The duration of cell shedding measured by nucleus movement (14 ± 1 min) is much less than the total duration of ZO-1 redistribution at the same sites (45 ± 2 min). In about 15% of cell shedding cases, neighboring epithelial cells also undergo extrusion with a delay of 5-10 min. With the use of normal mice, ZO-1 immunofluorescent staining of fixed tissue confirmed ZO-1 redistribution and the presence of ZO-1 patches beneath shedding cells. Immunostaining also showed that redistribution of ZO-1 occurred without corresponding mixing of apical and basolateral membrane domains as marked by ezrin or E-cadherin. ZO-1 redistribution is the earliest cellular event yet identified as a herald of physiological cell shedding, and redistribution of tight junction function along the lateral plasma membrane sustains epithelial barrier during cell shedding.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1522-1563
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
300
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
C1404-14
pubmed:meshHeading
pubmed:year
2011
pubmed:articleTitle
Redistribution of the tight junction protein ZO-1 during physiological shedding of mouse intestinal epithelial cells.
pubmed:affiliation
Dept. of Molecular and Cellular Physiology, University of Cincinnati College of Medicine, 231 Albert Sabin Way, Cincinnati, OH 45267-0576, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural