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. 1987 Apr;127(1):157–167.

In vitro studies of human monocyte migration across endothelium in response to leukotriene B4 and f-Met-Leu-Phe.

G Migliorisi, E Folkes, N Pawlowski, E B Cramer
PMCID: PMC1899584  PMID: 3031985

Abstract

Relatively little is known about monocyte emigration from the vasculature or about the factors that regulate this process. In this study, a human in vitro model of a blood vessel wall was used for examination of monocyte transendothelial migration. Umbilical vein endothelial cells were grown to confluency on amnion connective tissue, and human monocytes were stimulated to cross the monolayer in response to the chemoattractants leukotriene B4 or f-Met-Leu-Phe. The pattern and time course of monocyte migration were similar for the two chemotactic factors. In both cases, approximately 40-50% of the adherent monocytes extended single or multiple pseudopods into the apical endothelial surface. This indenting behavior was also observed in the absence of chemotactic factors. It was not affected by the medium (M199 or Gey's) or method of monocyte isolation. Neutrophils also displayed this behavior, but only about half as many neutrophils as monocytes indented the endothelial surface. The integrity of the endothelium remained intact as the monocytes traversed the monolayer. When the monocytes reached the basal surface of the endothelium, they frequently wedged themselves between the basal surface of the endothelium and its basal lamina. The monocytes then invaded the basal lamina and accumulated in the connective tissue. In response to both f-Met-Leu-Phe and leukotriene B4, monocyte migration across the endothelium began as early as 10 minutes. The average rate of accumulation in the connective tissue peaked at 30 minutes; and by 60 minutes, 25-35% of the monocytes had traversed the monolayer. Approximately two to three times as many monocytes traversed the endothelium under conditions of chemotaxis as under conditions of chemokinesis or random migration. These studies provide the basis for understanding the process of monocyte migration out of the bloodstream and lay the foundation for the study of their differentiation into macrophages in the connective tissue.

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Selected References

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