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. 1993 Mar;91(3):516–520. doi: 10.1111/j.1365-2249.1993.tb05934.x

Renal fibroblasts are sensitive to growth-repressing and matrix-reducing factors from activated lymphocytes.

A Kitamura 1, M Kitamura 1, R Nagasawa 1, N Maruyama 1, T Mitarai 1, T Takahashi 1, K Isoda 1
PMCID: PMC1554705  PMID: 8443972

Abstract

Various forms of nephropathy accompany interstitial fibrosis with lymphocytic infiltration. To probe the relationship between lymphocyte-derived factors and renal fibroblasts, we studied the effect of culture supernatant from lymphocytes stimulated by concanavalin A (ConASN) on the growth and matrix metabolism of rat kidney fibroblasts. 3H-thymidine incorporation and Northern analysis, respectively, revealed that ConASN repressed cell growth and the mRNA level of collagen type I, but dramatically elevated the steady-state expression of metalloproteinase transin/stromelysin. The growth inhibitor in ConASN was moderately heat-sensitive and less than 5 kD in molecular size, qualities that differed from those of transforming growth factor-beta (TGF-beta), IL-1 beta, IL-6, and tumour necrosis factor-alpha (TNF-alpha). The matrix regulatory factor in ConASN was highly heat-sensitive and more than 30 kD in size. Among several lymphokines tested, TNF-alpha produced the same effects as ConASN on the metabolism of extracellular matrix. We hypothesize that lymphocyte-derived factors have a significant role in the attenuation of renal fibrogenesis, as well as its progression, via inhibiting cell growth and matrix accumulation.

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Selected References

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