1,25-Dihydroxyvitamin D3 Inhibits the Cytokine-induced Secretion of MCP-1 and Reduces Monocyte Recruitment by Human Preadipocytes

Overview

Journal Int J Obes (Lond)

Specialty Endocrinology

Date 2012 Apr 18

PMID 22508334

Citations 62

Authors

D Gao

P Trayhurn

C Bing

Affiliations

Soon will be listed here.

Abstract

Background: Adipose tissue expansion during obesity is associated with a state of low-grade inflammation and an increase in macrophage infiltration, which predisposes to insulin resistance and vascular malfunction. Growing evidence suggests that vitamin D3 has immunoregulatory effects and adipose tissue could be a target for vitamin D3 action. Preadipocytes, one of the major cell types in adipose tissue, are actively involved in inflammatory processes.

Objectives: This study investigated whether the active form of vitamin D3 (1,25(OH)2D3) affects the production of proinflammatory chemokines/cytokines and the monocyte recruitment by human preadipocytes.

Methods/results: The secretion levels of monocyte chemoattractant proteint-1 (MCP-1), IL-8 and IL-6 were significantly higher in preadipocytes than in differentiated adipocytes, suggesting that preadipocytes could be a major source of proinflammatory mediators. Cytokine profile analysis revealed that 1,25(OH)2D3 (10 nM) markedly reduced the release of MCP-1, IL-6 and IL-8 by preadipocytes. The involvement of NFκB signalling was shown by the upregulation of IκBα protein abundance by 1,25(OH)2D3 in preadipocytes. In addition, 1,25(OH)2D3 was able to decrease the migration of THP-1 monocytes. Treatment with proinflammatory stimuli, including macrophage-conditioned (MC) medium, TNFα and IL-1β, led to a marked increase in protein release of MCP-1 and IL-6 by preadipocytes. Pretreatment with 1,25(OH)2D3 (10 nM and 100 nM) significantly decreased the stimulatory effects of MC medium, TNFα and IL-1β on MCP-1 expression and protein release, although the effect on stimulated release of IL-6 was less potent.

Conclusions: These results demonstrate that 1,25(OH)2D3 decreases the production of MCP-1 and other proinflammatory mediators by preadipocytes and reduces monocyte migration. Thus, vitamin D3 may protect against adipose tissue inflammation by disrupting the deleterious cycle of macrophage recruitment.

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