Endocrine Journal
Online ISSN : 1348-4540
Print ISSN : 0918-8959
ISSN-L : 0918-8959
Interleukin-1β Stimulates Transendothelial Mobilization of Human Peripheral Blood Mononuclear Cells with a Potential to Differentiate into Osteoclasts in the Presence of Osteoblasts
YASUHIDE TOKUKODASHOICHIRO TAKATAHIROSHI KAJIRIKO KITAZAWATOSHITSUGU SUGIMOTOKAZUO CHIHARA
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2001 Volume 48 Issue 4 Pages 443-452

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Abstract

There is accumulating evidence that interleukin-1 (IL-1) levels are increased locally at the site of active bone resorption in a variety of diseases including osteoporosis, periodontal disease and rheumatoid arthritis. However, the pathogenic role of IL-1 in bone loss remains to be fully elucidated. We present here additional evidence that IL-1β enhances endothelial activation and thereby stimulates mobilization of peripheral blood mononuclear cells (PBMCs) from luminal to abluminal spaces across the endothelium. Furthermore, IL-1β stimulates the differentiation of PBMCs into osteoclast-like cells with bone-resorbing activity in the presence of human osteoblastic SaOS-2 cells without systemic hormones. These findings provide circumstantial evidence for the hypothesis that IL-1β generated in the bone microenviroment plays a stimulatory role in PBMC mobilization from the peripheral circulation and their subsequent differentiation into osteoclast-like cells in the bone tissue. In addition, the present study supports the notion that osteoclast progenitor cells might be derived from the peripheral circulating blood mononuclear cells in human.

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© The Japan Endocrine Society
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