Section 39
Chapter 38,954

Isozyme patterns of branched-chain amino acid transminase in cultured Morris hepatoma 7316A

Tomita, Y.; Ichihara, A.; Masuji, H.; Sato, J.

Gan 67(3): 465-467


ISSN/ISBN: 0016-450X
PMID: 12063
Accession: 038953264

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Cultured cells from Morris hepatoma 7316A contained isozymes I and II, but not isozyme III, of branched-chain amino acid transaminase. They also contained tyrosine transaminase. Isozyme II and tyrosine transaminase were induced by addition of cortisol. These findings agree well with in vivo findings. However, prolonged culutre of the cells for over 500 days caused deviation of the chromosomal bumber and activity of both enzymes, and they were no longer affected by cortisol. A tumor formed by back-transplantation of the cells showed the typical isozyme pattern of rapidly growing hepatomas, such as Yoshida ascites hepatomas, i.e., isozymes I and III. These results were discussed in relation to change of gene expression during culture.

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