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Renal fibrosis and the origin of the renal fibroblast.
Authors:Frank Strutz  Gerhard A Müller
Affiliation:Department of Nephrology and Rheumatology, Georg-August-University Medical Center, Robert-Koch-Str. 40, 37099 Goettingen. fstrutz@gwdg.de
Abstract:Many studies have determined that the extent of tubulointerstitialinvolvement, particularly fibrosis, correlates better with renalfunction than glomerular changes do, thus, the extent of tubulointerstitialdamage in any given renal biopsy has important implicationsfor the renal prognosis of the patient (summarized in [1]).Tubulointerstitial fibrosis is characterized by the accumulationof extracellular matrix components including collagen typesI, III, IV, proteoglycans and fibronectin. In recent years,much controversy has been created in the nephrology communityregarding the origin of matrix-producing cells in the kidney.Several possibilities exist, including activation of residentinterstitial fibroblasts, migrating haematopoietic or mesenchymalstem cells from the bone marrow, periadventitial cells and epithelial–mesenchymaltransition (EMT) of tubular epithelial cells. This review summarizesrecent data indicating the possible origin of matrix-producingcells in the kidney, and illustrates from a clinical point of
Keywords:cortical fibroblast   epithelial mesenchymal transition   fibrosis   progression
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