Abstract
The effect of vitamin A deficiency on hepatic regeneration in male and female rats was studied after partial hepatectomy. A fourfold increase in the number of positive dUTP end-labeled nuclei was observed in the deficient animals as early as 30 minutes after partial hepatectomy and their number reached a peak by 8 hours after the operation. The bile duct cells were both morphologically and biochemically intact at all time points. Administration of retinyl palmitate 1 hour before partial hepatectomy significantly reduced the number of positive nuclei, and treatment with retinyl palmitate 24 or 48 hours before the operation reduced the number of positive cells to the level observed in control vitamin A-supplemented rats. The level of transcripts for c-jun, c-fos, c-myc, and transforming growth factor-beta 1 were increased for an extended period of time in livers of deficient animals, whereas the expression of both p53 and max were unchanged. Immunocytochemistry demonstrated the presence of latent transforming growth factor-beta 1 in cells showing evident apoptotic or necrotic changes in their nuclei. This study demonstrates the importance of vitamin A for the survival of hepatocytes both in intact vitamin A-deficient liver and after partial hepatectomy, whereas the ductal cells appear to be less sensitive to vitamin A deficiency.
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