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J Leukoc Biol. 2006 Apr;79(4):803-8. Epub 2006 Jan 24.

Different effects of adiponectin isoforms in human monocytic cells.

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  • 1Department of Internal Medicine I, University of Regensburg, D-93042 Regensburg, Germany.

Abstract

Adiponectin (APM) is an adipocyte-derived adipokine with immunosuppressive, antidiabetic, and antiatherosclerotic properties. Low molecular weight (LMW)- and higher molecular weight (HMW)-APM circulate in the serum and activate different signaling pathways. We were interested to see whether LMW-APM exerts different effects on monocytic cells compared with the HMW isoform. Therefore, the effects of recombinant LMW-APM produced in insect cells and the APM from higher eukaryotic cells containing HMW forms on monocytic cells were investigated with respect to apoptosis and inflammation. LMW- and HMW-APM induce apoptosis in nondifferentiated THP-1 cells, reduce macrophage scavenger receptor (MSR) A mRNA expression, and stimulate phosphorylation of adenosine monophosphate-activated protein kinase (AMPK). However, HMW-APM induces the secretion of interleukin (IL)-6 in human monocytes and THP-1 cells but does not suppress lipopolysaccharide (LPS)-induced IL-6 secretion. In contrast, LMW-APM reduces LPS-mediated IL-6 release and furthermore, stimulates IL-10 secretion, most likely by reducing the abundance of inhibitor of nuclear factor (NF)-kappaB kinase beta, leading to a diminished nuclear translocation of NF-kappaB p65. Our data indicate that the different APM isoforms do share common effects on monocytic cells but also induce isoform-specific responses. Although apoptosis, the activation of AMPK, and the reduction of MSR are mediated by all APM isoforms, only LMW-APM displays anti-inflammatory properties.

PMID:
16434692
[PubMed - indexed for MEDLINE]
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