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Elevated Expression of Transforming Growth Factor-β in Adipose Tissue from Obese Mice

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Abstract

Background

Tumor necrosis factor-α (TNF-α) is chronically elevated in the adipose tissue from obese humans and mice. This increase in TNF-α contributes to the insulin resistance, elevated plasminogen activator inhibitor-1 (PAI-1) levels, and cardiovascular complications associated with obesity and noninsulin-dependent diabetes (NIDDM). PAI-1 gene expression in adipose tissue is also stimulated by transforming growth factor-β (TGF-β). Experiments were performed to determine whether TGF-β is regulated by TNF-α and elevated in obesity.

Materials and Methods

The concentration of TGF-β and PAI-1 mRNA in murine adipose tissue and cultured 3T3-L1 adipocytes was determined by quantitative reverse transcription polymerase chain reaction (RT-PCR), and the cellular localization of these molecules was evaluated using in situ hybridization and cell fractionation. Total TGF-β protein was determined by employing an ELISA assay.

Results

TGF-β mRNA and protein were increased in the adipose tissue from two different strains of genetically obese mice (i.e., ob/ob and db/db), compared with their lean counterparts. This increase in TGF-β may result from TNF-α since TNF-α increased TGF-β mRNA expression in the adipose tissue of lean mice and stimulated TGF-β production by cultured adipocytes. Administration of TGF-β increased PAI-1 antigen in the plasma and PAI-1 mRNA in the adipocytes of lean mice, and enhanced the rate of PAI-1 synthesis by adipocytes in vitro.

Conclusions

TNF-α contributes to the elevated TGF-β expression demonstrated in the adipose tissue of obese mice. A potential role for TGF-β in the increased PAI-1 and vascular pathologies associated with obesity/NIDDM is suggested.

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Acknowledgments

This work was supported by grant HL 47819 to DJL. The authors thank T. Thinnes for her technical assistance. In addition we thank M. McRae for her expert secretarial skills.

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Samad, F., Yamamoto, K., Pandey, M. et al. Elevated Expression of Transforming Growth Factor-β in Adipose Tissue from Obese Mice. Mol Med 3, 37–48 (1997). https://doi.org/10.1007/BF03401666

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