Endotoxin-induced migration of monocytes and PECAM-1 phosphorylation are abrogated by PAF receptor antagonists

Yamin Shen, Chand Sultana, Moshe Arditi, Kwang Sik Kim, Vijay K. Kalra

Research output: Contribution to journalArticle

Abstract

The trafficking of monocytes across the endothelial lining of the blood vessel increases in response to bacterial infection at sites of inflammation. However, the molecular events involved in the diapedesis of monocytes in response to endotoxin are not completely understood. Our studies revealed that signaling by lipopolysaccharide (LPS) in human umbilical vein endothelial cells (HUVEC) resulted in a threefold increase in the transendothelial migration of monocyte-like HL-60 cells and a sevenfold increase in the phosphorylation of platelet endothelial cell adhesion molecule-1 (PECAM-1). The transmigration induced by LPS was inhibited by an antibody to PECAM-1. Both the phosphorylation of PECAM-1 and transendothelial migration of monocytes were inhibited by a platelet-activating factor (PAF) receptor antagonist, indicating the autocrine effect of PAF in these events. Treatment of HUVEC with LPS caused a fourfold increase in PAF receptor mRNA expression that was completely blocked by the PAF receptor antagonist. We conclude that PAF, generated by HUVEC in response to LPS or gram-negative bacterial infection, acts in an autocrine manner, causing PECAM-1 phosphorylation and thus the transendothelial migration of monocytes.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume275
Issue number3 38-3
StatePublished - Sep 1998
Externally publishedYes

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CD31 Antigens
Phosphorylation
Transendothelial and Transepithelial Migration
Endotoxins
Lipopolysaccharides
Monocytes
Endothelial cells
Human Umbilical Vein Endothelial Cells
Platelet Activating Factor
Gram-Negative Bacterial Infections
Blood vessels
Linings
HL-60 Cells
Bacterial Infections
Blood Vessels
Messenger RNA
platelet activating factor receptor
Antibodies
Inflammation

Keywords

  • Diapedesis
  • Endothelial cells
  • Lipopolysaccharide
  • Platelet endothelial cell adhesion molecule-1
  • Platelet-activating factor
  • Transendothelial migration

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Biochemistry
  • Physiology (medical)

Cite this

Endotoxin-induced migration of monocytes and PECAM-1 phosphorylation are abrogated by PAF receptor antagonists. / Shen, Yamin; Sultana, Chand; Arditi, Moshe; Kim, Kwang Sik; Kalra, Vijay K.

In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 275, No. 3 38-3, 09.1998.

Research output: Contribution to journalArticle

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