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Reversal of ethanol and indomethacin‐induced suppression of hepatic DNA synthesis by 16,16‐dimethyl prostaglandin E 2
Author(s) -
McNeil Gloria E.,
Chen Thomas S.,
Leevy Carroll M.
Publication year - 1985
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.1840050110
Subject(s) - ethanol , prostaglandin e2 , dna synthesis , prostaglandin , liver regeneration , alcohol , hepatectomy , medicine , endocrinology , dna , biology , chemistry , pharmacology , biochemistry , regeneration (biology) , surgery , resection , microbiology and biotechnology
Abstract Investigations were undertaken to determine effectiveness of 16,16‐dimethyl prostaglandin E 2 (dmPGE 2 ) in overcoming the suppressive effects of ethanol and/or indomethacin on hepatic DNA synthesis. Adult litter mate Sprague‐Dawley rats were subjected to sham operation or partial hepatectomy. Immediately after partial hepatectomy, and at 8‐hr intervals for 24 hr, the rats were given: (a) ethanol with and without dmPGE 2 or (b) indomethacin with and without ethanol and/or dmPGE 2 . DmPGE 2 produced a significant increase in DNA synthesis in sham‐operated (p < 0.001) and untreated partially hepatectomized animals (p < 0.025). Ethanol and indomethacin caused a 6‐ and 18‐fold reduction, respectively, in hepatic DNA synthesis following partial hepatectomy. DmPGE 2 overcame the inhibitory effect of ethanol (p < 0.005) and indomethacin (p < 0.0005) in partially hepatectomized animals. Mitoses were decreased concomitantly with ethanol and/or indomethacin‐induced reduction in DNA synthesis and increased with administration of dmPGE 2 . It is concluded that dmPGE 2 increases hepatic DNA synthesis and regeneration in normal rat liver and overcomes their inhibition when ethanol and/or indomethacin is given after partial hepatectomy. Timing of dmPGEz administration is crucial. When given 30 min before ethanol, it completely inhibits suppression of regenerative activity; omission of this “priming” dmPGE 2 dose results in only 44% of DNA synthesis obtained in control animals.