M Van Hul1, H R Lijnen. 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.
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.
Authors: Diane M Jaworski; Olga Sideleva; Holly M Stradecki; Garret D Langlois; Aida Habibovic; Basanthi Satish; William G Tharp; James Lausier; Kyla Larock; Thomas L Jetton; Mina Peshavaria; Richard E Pratley Journal: Endocrinology Date: 2011-02-01 Impact factor: 4.736
Authors: Vanessa A Belo; Marcelo R Luizon; Patrícia C Carneiro; Valéria A Gomes; Riccardo Lacchini; Carla M M Lanna; Debora C Souza-Costa; Jose E Tanus-Santos Journal: Mol Biol Rep Date: 2012-12-16 Impact factor: 2.316