Norepinephrine modulates the growth-inhibitory effect of transforming growth factor-beta in primary rat hepatocyte cultures - PubMed (original) (raw)
Norepinephrine modulates the growth-inhibitory effect of transforming growth factor-beta in primary rat hepatocyte cultures
K A Houck et al. J Cell Physiol. 1988 Jun.
Abstract
TGF-beta is a potent inhibitor of EGF-induced DNA synthesis in primary rat hepatocyte cultures. Norepinephrine (NE) was shown to modulate this inhibition of DNA synthesis. It produced a five-fold increase, from 2.8 pM to 14.4 pM, in the ID50 for TGF-beta. The effect was dose-dependent and was significant at concentrations of 10(-6)M NE and greater. The modulation by NE was mediated by the alpha 1-adrenergic receptor as shown by the ability of the alpha 1 antagonist prazosin to block the activity. This effect might be important during liver regeneration in allowing escape of hepatocytes from negative growth control exerted by TGF-beta.
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