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The High Serum Monocyte Chemoattractant Protein-1 in Obesity is Influenced by High Parathyroid Hormone and Not Adiposity

Overview
Specialty Endocrinology
Date 2011 Apr 22
PMID 21508136
Citations 16
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Abstract

Context: Chronic high levels of PTH may be associated with up-regulation of proteases and cytokines. Monocyte chemoattractant protein-1 (MCP-1) is an inflammatory cytokine, produced predominantly by macrophages and endothelial cells, and is expressed in adipose tissue. More recently it has been shown that PTH administration increases MCP-1 expression in osteoblasts.

Objectives: Because both PTH and MCP-1 levels are higher in obesity, the goal was to determine whether the high MCP-1 occurs only in the presence of high serum PTH and is independent of adiposity and examine its relationship with bone mineral density (BMD) and turnover.

Design, Setting, And Participants: In this case-control clinical design, 111 eligible women were categorized into four groups: leaner women [body mass index (BMI) 23 ± 2 kg/m(2)] with normal or higher PTH and obese (BMI 44 ± 7 kg/m(2)) with normal or higher PTH.

Results: Serum MCP-1 levels were higher (P < 0.01) in the high (PTH = 74.9 ± 27.0 pg/ml, MCP-1 = 421.5 ± 157.0 pg/ml) compared with normal PTH (PTH = 32.5 ± 10.4 pg/ml, MCP-1 = 322.5 ± 97.8 pg/ml) group, independent of BMI. C-reactive protein and adiponectin were influenced only by BMI and not PTH. MCP-1 was positively associated with osteocalcin and propeptide of type 1 collagen in the leaner (r > 0.3, P < 0.05) but not the obese women and was not associated with BMD in either group.

Conclusions: Together these data suggest that MCP-1 is higher only in the presence of increased PTH and that adiposity alone cannot explain the higher MCP-1 levels in obesity.

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