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Properties of peroxisomes and their induction by clofibrate in normal adult rat hepatocytes in primary culture

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Summary

Alterations in peroxisomes and catalase activity and their responsiveness to clofibrate in adult rat hepatocytes in primary culture were investigated.

The numbers of peroxisomes with and without crystalloid nucleoids per unit cytoplasmic area were preserved in cultured hepatocytes for 2 d after seeding at a level comparable to that of freshly isolated hepatocytes. At Day 3 in culture, the number of anucleoid peroxisomes was reduced in untreated hepatocytes, accompanied by more significant reduction in the number of nucleoid-containing peroxisomes, which decreased until Day 5. Peroxisome diameters were reduced in untreated hepatocytes at Day 2 and this decrease in the diameter was continued until Day 7. Catalase activity in untreated hepatocytes decreased markedly with culture age.

The number of anucleoid peroxisomes was significantly greater in hepatocytes treated with 2mM clofibrate in culture than in freshly isolated hepatocytes for 2 d or in untreated hepatocytes of the same culture age through 7 d. The number of nucleoid-containing peroxisomes in the treated cells began to decrease in 3 d, but was greater than that of untreated cells at Days 3 and 5. Peroxisomes with well-developed nucleoids were observed frequently in the treated cells even at Day 7. Peroxisome diameters were greater in the treated cells than in untreated cells at Days 3, 5, and 7. Catalase activity was always higher in the treated cells than in untreated cells. These results suggest that clofibrate is effective in inducing peroxisome proliferation as well as in maintaining the organelles in cultured hepatocytes.

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This work was supported in part by Grants-in-Aid for Scientific Research from Ministry of Education, Science and Culture, Japan, 448143, 50168, 501069, and 577196, and by a Grant-in-Aid from Hokkaido Geriatrics Research Institute.

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Furukawa, K., Mochizuki, Y. & Sawada, N. Properties of peroxisomes and their induction by clofibrate in normal adult rat hepatocytes in primary culture. In Vitro 20, 573–584 (1984). https://doi.org/10.1007/BF02639773

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