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Diabetes 50:2080-2086, 2001
© 2001 by the American Diabetes Association, Inc.

Adipocyte Produces Matrix Metalloproteinases 2 and 9

Involvement in Adipose Differentiation

Anne Bouloumié, Coralie Sengenès, Ghyslaine Portolan, Jean Galitzky, and Max Lafontan

Institut National de la Santé et de la Recherche Médicale (INSERM) U317, Laboratoire de Pharmacologie Médicale et Clinique, Toulouse, France

Adipocyte hypertrophy and hyperplasia together with angiogenesis contribute to the growth of the fat mass. Because changes in the extracellular matrix (ECM) components are often associated with such cellular remodeling, we studied the adipocyte expression of the matrix metalloproteinases (MMPs) 2 and 9, two key enzymes involved in the modulation of ECM. The present study provides the first evidence that human adipose tissue produces and secretes MMP-2 and -9 as shown by gelatin zymography analysis performed on media conditioned by human subcutaneous adipose tissue and human preadipocytes in primary cultures and by reverse transcriptase–polymerase chain reaction (RT-PCR) analysis on transcripts from mature human adipocytes. The further characterization performed on the murine 3T3F442A preadipocyte cell line demonstrates that MMP expression, assessed by RT-PCR and Western blot analysis, as well as activity, assessed by gelatin zymography analysis, increased during the adipocyte differentiation, whereas the expression of tissue inhibitor metalloproteinases 1 and 2 were abolished or not affected, respectively. Finally, preadipocyte treatment with MMP inhibitors such as batimastat and captopril, as well as neutralizing antibodies, markedly decreased adipocyte differentiation as demonstrated by the inhibition in the appearance of lipogenic (triglycerides) and lipolytic (glycerol release and hormone-sensitive lipase expression) markers. These data suggest that MMP-2 and -9 could be important key regulators of adipocyte differentiation. Thus, the adipocyte-derived MMPs might represent a new target for the inhibition of adipose tissue growth.


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