Plasma cells and Fc receptors in human adipose tissue--lipogenic and anti-inflammatory effects of immunoglobulins on adipocytes

• We have previously reported high immunoglobulin expression in human omental adipose tissue. The aim of this work was to investigate plasma cell density and Fc receptor (FcR) expression in human adipose tissue depots and in vitro effects of immunoglobulins on adipocyte function. Plasma cell density was higher in the visceral compared to the subcutaneous depot (10.0+/-1.56% and 5.2+/-0.98%, respectively, n=20, p<0.05). Microarray analysis revealed expression of four FcR genes in adipose tissue; FCGR2A, FCGR2B, FCER1G, and FCGRT. FCGR2A was highly expressed in adipocytes in both depots and this was verified by immunohistochemistry. Expression of IL-1beta and IL-6 was markedly reduced in adipocytes after incubation with the Fc moiety of immunoglobulin G (Fc) (p<0.01). Furthermore, Fc stimulated adipocyte lipogenesis as potently as insulin (p<0.05), but did not influence lipolysis. In conclusion, immunoglobulins produced by plasma cells in human adipose tissue could influence adipocyte metabolism and cytokine production.

Nyckelord

Adipocytes/immunology

Adipose Tissue/*cytology/*immunology

Adult

Cell Count

Cytokines/genetics

Female

Gene Expression

Humans

Immunoglobulins/*genetics

Lipid Metabolism/immunology

Male

Oligonucleotide Array Sequence Analysis

Omentum/cytology

Plasma Cells/*immunology

Receptors

Fc/*analysis/*genetics

Adipocytes/immunology

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