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- W1972705953 abstract "The potential of transforming growth factor-beta (TGF-beta) to modulate the growth of endothelial cells via alterations in the cell's extracellular matrix (ECM) was examined. Rat brain endothelial cells were cultured in the presence or absence of TGF-beta, and subsequently ECM was prepared from the cell cultures by hypotonic lysis of the cells. Untreated endothelial cells were then cultured on the various matrices. Cells grown on TGF-beta-treated ECM showed a significant decrease in cell number (41 +/- 6% mean growth inhibition at 6 days, P less than 0.005 by paired T-test) compared with cells grown on untreated ECM. The growth inhibitory activity of the ECM was depleted by 9 days of culture, and resumption of exponential cell growth was observed. A similar phenomenon was observed if anti-TGF-beta neutralizing antibodies were incubated with the ECM. When the TGF-beta-treated matrix was exposed to a brief dithiothreitol treatment in order to inactivate residual TGF-beta, an approximately equal degree of growth inhibition was observed initially, but the reversal of inhibition occurred at an earlier time point than that with unreduced TGF-beta-treated matrix. Analyses of the composition of matrices synthesized in the presence or absence of TGF-beta revealed about a twofold increase in the accumulation of various radioactive metabolic precursors in the TGF-beta-treated matrices. However, no qualitative alterations in the matrix or cellular-associated proteins or glycoproteins were observed, as analyzed by polyacrylamide gel electrophoresis in sodium dodecyl sulfate. An increase in cell-associated heparan sulfate, however, was observed in TGF-beta-treated cells. The results suggest that certain growth regulatory effects of TGF-beta may be mediated, at least in part, by alterations in the ECM." @default.
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- W1972705953 date "1990-09-01" @default.
- W1972705953 modified "2023-10-16" @default.
- W1972705953 title "Growth regulatory activities of endothelial extracellular matrix: Mediation by transforming growth factor-β" @default.
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- W1972705953 doi "https://doi.org/10.1016/0014-4827(90)90153-2" @default.
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