AJP - Renal Physiology, Vol 266, Issue 6 829-F842, Copyright © 1994 by American Physiological Society

ARTICLES

The emerging role of transforming growth factor-beta in kidney diseases

K. Sharma and F. N. Ziyadeh

Transforming growth factor-beta (TGF-beta) is a prototypical multifunctional cytokine, with growth being only one of its many functions. Its receptors and actions are germane to almost every cell in the body involved in tissue injury and repair, and its effects are best understood in the context of a cellular response to a changing environment. The broad areas in which TGF-beta plays a crucial role include cell proliferation and extracellular matrix production. TGF-beta is a key regulatory molecule in the control of the activity of fibroblasts and has been implicated in several disease states characterized by excessive fibrosis. In the kidney, TGF-beta promotes tubuloepithelial cell hypertrophy and regulates the glomerular production of almost every known molecule of the extracellular matrix, including collagens, fibronectin, tenascin, and proteoglycans, as well as the integrins that are the receptors for these molecules. Furthermore, TGF-beta blocks the destruction of newly synthesized extracellular matrix by upregulating the synthesis of protease inhibitors and downregulating the synthesis of matrix-degrading proteases such as stromelysin and collagenase. As will be discussed, there is a strong body of in vitro and in vivo evidence suggesting that persistent overproduction of TGF-beta 1 in glomeruli after the acute inflammatory stage of glomerulonephritis causes glomerulosclerosis. TGF-beta may also be important in a variety of other chronic renal disorders characterized by hypertrophy and sclerosis, such as diabetic nephropathy. In this review we will attempt to offer a basic understanding of the cellular and molecular biology of TGF-beta and its receptors, with special focus on the role of the TGF-beta system in the kidney during development, growth, and disease.

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