Home » Key Drug Discovery Articles » The inhibition of human tumor cell proliferation by RNase Pol, a member of the RNase T1 family, from Pleurotus ostreatus.

The inhibition of human tumor cell proliferation by RNase Pol, a member of the RNase T1 family, from Pleurotus ostreatus.

Kobayashi H, Motoyoshi N, Itagaki T, Tabata K, Suzuki T, Inokuchi N.

Biosci Biotechnol Biochem. 2013;77(7):1486-91.

School of Pharmacy, Nihon University, Funabashi, Chiba 274-8555, Japan. [email protected]

 

Abstract

RNase Po1 is a guanylic acid-specific ribonuclease (a RNase T1 family RNase) from Pleurotus ostreatus. We determined the cDNA sequence encoding RNase Po1 and expressed RNase Po1 in Escherichia coli. A comparison of the enzymatic properties of RNase Po1 and RNase T1indicated that the optimum temperature for RNase Po1 activity was 20 °C higher than that for RNase T1. An MTT assay indicated that RNase Po1 inhibits the proliferation of human neuroblastoma cells (IMR-32 and SK-N-SH) and human leukemia cells (Jurkat and HL-60). Furthermore, Hoechst 33342 staining showed morphological changes in HL-60 cells due to RNase Po1, and flow cytometry indicated the appearance of a sub-G1 cellpopulation. The extent of these changes was dependent on the concentration of RNase Pol. We suggest that RNase Po1 induces apoptosis in tumorcells.

 

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