Abstract
Low concentrations of TGF-beta inhibited the clonal proliferation of three different preparations of mouse bone marrow progenitor cells in vitro. Normal marrow cells responsive to CSF-1; two-day post-fluorouracil cells responsive to CSF-1 plus IL-3 and IL-1 alpha; and regenerating seven-day post-fluorouracil cells responsive to CSF-1 plus IL-3, IL-1 alpha and IL-6 were all severely inhibited by TGF-beta 1; and the inhibitory effects were antagonized by increasing the concentrations of the relevant growth factors.
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