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. 1985 Jun;82(12):3964–3968. doi: 10.1073/pnas.82.12.3964

Purification, induction, and distribution of placental glutathione transferase: a new marker enzyme for preneoplastic cells in the rat chemical hepatocarcinogenesis.

K Satoh, A Kitahara, Y Soma, Y Inaba, I Hatayama, K Sato
PMCID: PMC397914  PMID: 3923485

Abstract

A polypeptide of Mr 26,000 and pI 6.7 that was markedly increased in rat livers bearing hyperplastic nodules (HNs) induced by chemical carcinogens was identified immunochemically as the subunit of neutral glutathione (GSH) transferase (GSHTase; RX:glutathione R-transferase, EC 2.5.1.18; also called GSH S-transferase) purified from placenta (GSHTase-P) and was demonstrated immunohistochemically to be localized in preneoplastic foci and HNs. In the present study, GSHTase-P has been purified from the HN-bearing liver, and the distribution and inducibility have been examined quantitatively using anti-GSHTase-P antibody. Elevation of GSHTase-P in the HN-bearing livers was also confirmed by in vitro translation of mRNAs isolated from the HN-bearing livers. The purified GSHTase-P was homogeneous in size but had two charge isomers on two-dimensional gel electrophoresis. In normal tissues, including liver, placenta, and fetal liver, the protein content of GSHTase-P was generally low but was significantly high in kidney and pancreas. In contrast, the amount of GSHTase-P in HN-bearing livers (primary hepatomas) and transplantable Morris hepatoma 5123D were several 10-fold higher than that in normal liver but were undetectably low in transplantable Yoshida ascites hepatoma AH 130. Different from ordinary drug-metabolizing enzymes, GSHTase-P was uninducible by administration of drugs and carcinogens prior to appearance of the preneoplastic foci and HNs. In addition, species specificity of GSHTase-P was low as it was crossreactive among rat, hamster, and human.

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Selected References

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