Title : Elevated glucose stimulates TGF-beta gene expression and bioactivity in proximal tubule.

Pub. Date : 1992 Jan

PMID : 1593845






12 Functional Relationships(s)
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1 Elevated glucose stimulates TGF-beta gene expression and bioactivity in proximal tubule. Glucose transforming growth factor, beta 1 Mus musculus
2 Because transforming growth factor-beta (TGF-beta) inhibits cell proliferation in most epithelial cell lines, we hypothesized that the inhibitory effect of high glucose levels on cell proliferation may be mediated by TGF-beta. Glucose transforming growth factor, beta 1 Mus musculus
3 Because transforming growth factor-beta (TGF-beta) inhibits cell proliferation in most epithelial cell lines, we hypothesized that the inhibitory effect of high glucose levels on cell proliferation may be mediated by TGF-beta. Glucose transforming growth factor, beta 1 Mus musculus
4 The present studies were performed to test the hypothesis that TGF-beta is an autocrine cytokine whose activity can be modulated by ambient glucose. Glucose transforming growth factor, beta 1 Mus musculus
5 Exogenous TGF-beta inhibited [3H]-thymidine incorporation in a dose-dependent fashion and with high affinity (picomolar range), but with slightly lower potency in high versus normal glucose media. Tritium transforming growth factor, beta 1 Mus musculus
6 Exogenous TGF-beta inhibited [3H]-thymidine incorporation in a dose-dependent fashion and with high affinity (picomolar range), but with slightly lower potency in high versus normal glucose media. Thymidine transforming growth factor, beta 1 Mus musculus
7 Exogenous TGF-beta inhibited [3H]-thymidine incorporation in a dose-dependent fashion and with high affinity (picomolar range), but with slightly lower potency in high versus normal glucose media. Glucose transforming growth factor, beta 1 Mus musculus
8 Northern analysis of mRNA demonstrated that proximal tubule cells constitutively express TGF-beta 1 transcripts, and that the steady state level of TGF-beta 1 mRNA was, on average, 63% higher in the cells grown for 48 hours in high versus normal glucose media. Glucose transforming growth factor, beta 1 Mus musculus
9 Furthermore, the conditioned media of cells exposed to 450 mg/dl glucose exhibited endogenous TGF-beta bioactivity as measured by inhibition of cell proliferation. Glucose transforming growth factor, beta 1 Mus musculus
10 The addition of a rabbit antiporcine TGF-beta neutralizing antibody significantly increased basal thymidine incorporation in high glucose media to levels approaching those of cells grown in normal glucose media. Thymidine transforming growth factor, beta 1 Mus musculus
11 The addition of a rabbit antiporcine TGF-beta neutralizing antibody significantly increased basal thymidine incorporation in high glucose media to levels approaching those of cells grown in normal glucose media. Glucose transforming growth factor, beta 1 Mus musculus
12 The addition of a rabbit antiporcine TGF-beta neutralizing antibody significantly increased basal thymidine incorporation in high glucose media to levels approaching those of cells grown in normal glucose media. Glucose transforming growth factor, beta 1 Mus musculus