Five different isoforms of cytochrome P450 including 1A1, 1A2, 2E1, 2A
and 2B6 have been identified in human glioma Hs 683 cell line using R
T-PCR reaction. These isoforms belong to four distinct subfamilies. Th
e effect of benzanthracene (Ba) as inducer was tested on the mRNA leve
l of cytochrome P450 1A1. Northern blot analysis clearly showed an ind
uction response from these cells to Ba in a proportion that is compara
ble to the induction seen in rat glioma cells.