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J Thromb Haemost. 2008 Jul;6(7):1198-206. doi: 10.1111/j.1538-7836.2008.02988.x. Epub 2008 Jul 1.

A functional role of gelatinase A in the development of nutritionally induced obesity in mice.

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1
Centre for Molecular and Vascular Biology, KU Leuven, Leuven, Belgium.

Abstract

BACKGROUND:

Development of adipose tissue is a complex process involving adipogenesis, angiogenesis and proteolytic remodeling of the extracellular matrix. The matrix metalloproteinase (MMP) system plays an important role in these processes.

OBJECTIVE:

To establish a functional role of gelatinase A (MMP-2) in the development of adipose tissue.

METHODS:

Mice with genetic deficiency in gelatinase A (MMP-2(-/-)) and their wild-type littermates (MMP-2(+/+)), as well as wild-type mice treated with a gelatinase inhibitor, were kept on a high-fat diet (HFD) for 15 weeks, and this was followed by analysis of weight and composition of the fat pads.

RESULTS:

MMP-2(-/-) mice gained significantly (P < 0.05) less weight on the HFD than MMP-2(+/+) mice, resulting in lower body weights (P < 0.0005). The weights of the isolated subcutaneous and gonadal adipose tissues were also significantly lower (P < 0.005 and P < 0.0005, respectively). Immunohistochemical analysis revealed significant (P < 0.05) adipocyte hypotrophy in both fat pads. Treatment of wild-type mice with the gelatinase inhibitor Tolylsam resulted in an approximately 15% reduction of body weight (P < 0.0001) and significantly lower subcutaneous and gonadal adipose tissue mass, associated with adipose hypotrophy (all P < 0.0001).

CONCLUSION:

Deficiency of MMP-2 impairs adipose tissue development in mice by contributing to adipocyte hypotrophy.

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