Production of Kasahara isoenzyme by OKK cell line established from a human maxillary carcinoma.

A cell line, designated OKK, has been established from a human maxillary carcinoma in a Japanese man. The cultured cells were inoculated into nude mice, with the subsequent establishment of tumors. Alkaline phosphatases were extracted from these tumors and partially purified by chromatography. The electrophoretically fastest moving isoenzyme, designated tentatively as OKK T isoenzyme, was biochemically and immunologically investigated by comparing it with the Kasahara isoenzyme purified partially from the tumor, which originated from FL cells inoculated into a nude mouse. The properties of the OKK T isoenzyme were identical to those of the Kasahara isoenzyme. Thus, the enzymes showed a similar inhibition by amino acids (L-phenylalanine and L-leucine), the same behavior with respect to other properties, including heat stability, immunological character and molecular weight. The genetic phenotype of the glucose-6-phosphate dehydrogenase of this established cell line was proved not to be identical to that of a HeLa cell line.