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Attachment of the PSGL-1 cytoplasmic domain to the actin cytoskeleton is essential for leukocyte rolling on P-selectin.

Abstract：

:P-selectin glycoprotein ligand-1 (PSGL-1) serves as the leukocyte ligand for P-selectin, and many of the structural features of its ectodomain required for interactions with P-selectin have been uncovered. In contrast, the function of the highly conserved PSGL-1 cytoplasmic domain has not been explored. Stable transfectants expressing similar levels of either wild-type PSGL-1 or truncated PSGL-1 in which only 4 cytoplasmic residues were retained (designated PSGL-1 Delta cyto), were analyzed. Transfectants expressing full-length PSGL-1 rolled well on P-selectin. In contrast, rolling was almost completely absent in cells transfected with PSGL-1 Delta cyto, even at low shear. Importantly, cells expressing truncated PSGL-1 were able to bind soluble P-selectin and to bind COS cells overexpressing P-selectin, demonstrating that the P-selectin binding site on the PSGL-1 Delta cyto transfectants was intact and was capable of recognizing P-selectin. Impaired rolling by PSGL-1 Delta cyto transfectants was not due to alterations in subcellular localization because both wild-type and truncated PSGL-1 had similar surface distributions on K562 transfectants. Treatment of cells expressing native PSGL-1 with actin cytoskeletal toxins inhibited adhesion in a dose-dependent way. PSGL-1 was associated with the actin cytoskeleton, and this interaction was greatly impaired in PSGL-1 Delta cyto- expressing cells. The PSGL-1 cytoplasmic domain interacted selectively with the ezrin/radixin/moesin (ERM) protein moesin, but not with other ERM proteins or several other cytoskeletal linker proteins. Pharmacologic disruption of interactions between moesin and F-actin in cells expressing PSGL-1 resulted in a dose-dependent inhibition of rolling on P-selectin. Thus, attachment of PSGL-1 to the leukocyte cortical cytoskeleton is essential for leukocyte rolling on P-selectin.

journal_name

Blood

journal_title

Blood

authors

Snapp KR,Heitzig CE,Kansas GS

doi

10.1182/blood.v99.12.4494

subject

Has Abstract

pub_date

2002-06-15 00:00:00

pages

4494-502

issue

12

eissn

0006-4971

issn

1528-0020

journal_volume

99

pub_type

杂志文章

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