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• W1963143293 endingPage "1067" @default.
• W1963143293 startingPage "1061" @default.
• W1963143293 abstract "Calorie restriction without essential nutrient deficiency (calorie restriction, CR) abrogates experimental carcinogenesis and extends healthful life span. To test whether CR influences cell-cycle protein expression during the hepatocellular proliferation induced by 70% partial hepatectomy (PH), BALB/c mice were separated into two groups, fed comparable semi-purified diets for 10 weeks that differed 40% in caloric offering, and were then subjected to PH. When PH was performed, CR mice weighed 36% less than ad libitum (AL)-fed mice (P < 0.01), but liver-to-body weight ratios were similar. During the regenerative hyperplasia, hepatocytes of CR mice demonstrated evidence of accelerated entrance and passage through G1 and S phases, and an earlier exit from the cell cycle. The first peak of DNA synthesis occurred 6 hr earlier, and the second peak was significantly greater among CR mice with 38% +/- 13% bromodeoxyuridine (BrdU)-positive hepatocytes, compared with 14% +/- 4% in AL mice (P < 0.01). More E2F-1 expression was induced at the hepatic G1/S boundary just prior to each peak of DNA synthesis in regenerating livers of CR mice (P < 0.01), and 8 hr earlier among CR mice. More hyperphosphorylated retinoblastoma p110 was detected during hepatic G1 and the G1-S transition among CR mice, coincident with the early hepatocellular proliferative wave. Cyclin A was induced during the first peak of DNA synthesis 4 hr earlier among CR mice, and it continued 4 hr longer in AL mice, indicating an earlier post-replicative exit by hepatocytes in CR mice. p21 was induced during the G1 phase at 4 hr post-PH, and was maximally expressed during and after peak DNA synthesis in both dietary groups. These results indicate that CR influences cell cycle protein expression levels, causing hepatocytes to enter into S phase earlier and exit abruptly from the cell cycle, and they support the premise that CR enhances induced cell responsiveness by influencing cell cycle regulatory controls." @default.
• W1963143293 created "2016-06-24" @default.
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• W1963143293 date "2001-12-01" @default.
• W1963143293 modified "2023-10-12" @default.
• W1963143293 title "Calorie Restriction Influences Cell Cycle Protein Expression and DNA Synthesis during Liver Regeneration" @default.
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• W1963143293 doi "https://doi.org/10.1177/153537020122601114" @default.
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