Short Communication

International Journal of Obesity (2005) 29, 146–150. doi:10.1038/sj.ijo.0802839 Published online 2 November 2004

Monocyte chemoattractant protein-1 is produced in isolated adipocytes, associated with adiposity and reduced after weight loss in morbid obese subjects

T Christiansen1, B Richelsen1 and J M Bruun1

1Department of Endocrinology and Metabolism C, Aarhus University Hospital, Aarhus Sygehus, Tage Hansens gade 2, DK-8000 Aarhus C, Denmark

Correspondence: Dr JM Bruun, Department of Endocrinology and Metabolism, Aarhus University Hospital, Aarhus Sygehus, Tage Hansensgade 2, DK-8000 Aarhus C, Denmark. E-mail: Jens.Bruun@ki.au.dk

Received 2 February 2004; Revised 6 June 2004; Accepted 15 August 2004; Published online 2 November 2004.

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Abstract

BACKGROUND:

 

Obesity is associated with insulin resistance and premature atherosclerosis. The human adipose tissue produce several adipokines including monocyte chemoattractant protein (MCP)-1, associated with cardiovascular disease and found to be involved in the pathogenesis of atherosclerosis in vitro.

OBJECTIVE:

 

(1) To compare mRNA levels of MCP-1, leptin and a macrophage-specific marker (CD68) in isolated adipocytes vs stromal–vascular (SV) cells, (2) to compare mRNA levels of MCP-1 in human adipose tissue to circulating MCP-1 and adiposity (eg BMI: kg/m2) and (3) investigate the effect of weight loss in obese subjects on circulating MCP-1 and leptin.

RESULTS:

 

(1) MCP-1 and CD68 mRNA levels in isolated adipocytes vs SV cells were 17% (P<0.01) and approx2% (P<0.001), respectively. Leptin mRNA levels in SV cells were approx1% of that in isolated adipocytes (P<0.01). (2) MCP-1 mRNA levels correlated with circulating MCP-1 (P<0.05) and BMI (P<0.05). (3) A 12% weight loss (P<0.001) was associated with a 25% decrease in insulin levels (P<0.01). Circulating MCP-1 and leptin decreased by 20% (P<0.001) and by 24% (P<0.001), respectively.

DISCUSSION:

 

The findings demonstrate that MCP-1 is produced in isolated human adipocytes. In addition, the findings suggest that MCP-1 may be involved in obesity-related health complications and support the hypothesis that weight loss is beneficial by improving the low-grade inflammation observed in obesity.

Keywords:

MCP-1, adipokines, adipose tissue, macrophages, leptin

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