Linked Life Data

12540844

Source:http://linkedlifedata.com/resource/pubmed/id/12540844

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
13
pubmed:dateCreated
2003-3-24
pubmed:abstractText
CD44 can function as an adhesion receptor that mediates leukocyte rolling on hyaluronan (HA). To study the contributions of different domains of the standard isoform of CD44 to cell rolling, a CD44-negative mouse T lymphoma AKR1 was transfected with wild type (WT) or mutated cDNA constructs. A parallel flow chamber was used to study the rolling behavior of CD44 transfectants on immobilized HA. For CD44WT transfectants, the fraction of cells that rolled and the rolling velocity was inversely proportional to the amount of cell surface CD44. When the cytoplasmic domain distal to Gly(305) or sequences that serve as binding sites for cytoskeletal linker proteins, were deleted or replaced with foreign sequences, no significant changes in the rolling behavior of mutant cells, compared with the transfectant expressing CD44WT, were observed. Transfectants lacking 64 amino acids of the cytoplasmic tail distal to Cys(295) adhered to HA but showed enhanced rolling at low shear forces. When 83 amino acids from the "non-conserved" membrane-proximal region of the CD44 extracellular domain were deleted, cells adhered firmly to the HA substrate and did not roll at any fluid shear force tested. Unlike wild type cells that exhibited a nearly homogeneous distribution of CD44 on a smooth cell surface, cells expressing the non-conserved region deletion mutant accumulated CD44 in membrane protrusions. Disruption of the actin cytoskeleton with cytochalasin B precluded the formation of membrane protrusions, however, treated cells still adhered firmly to HA and did not roll. We conclude that interaction between the cytoplasmic domain of CD44 and the cytoskeleton is not required for cell rolling on immobilized ligand. The strong effect of deletion of the non-conserved region of the extracellular domain argues for a critical role of this region in CD44-dependent rolling and adhesion interactions with HA under flow.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
28
pubmed:volume
278
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
11150-8
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Role of the extracellular and cytoplasmic domains of CD44 in the rolling interaction of lymphoid cells with hyaluronan under physiologic flow.
pubmed:affiliation
Department of Orthopedic Surgery, Section of Biochemistry and Molecular Biology, Rush University at Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.