title: Modulation of radiation-induced protein kinase C activity by phenolics.
abstract: Natural phenolic compounds were tested in vitro for their effect on the activity of protein kinase C (PKC) isolated from the liver cytosol and the particulate fraction of unirradiated mice and mice irradiated at 5 Gy. Following irradiation, the PKC activity was found to be increased in both cytosolic and particulate fractions. Curcumin, ellagic acid and quercetin were effective in inhibiting radiation-induced PKC activity. Curcumin and ellagic acid were found to be more inhibitory towards radiation-induced PKC activity, while quercetin was the least effective. Curcumin was found to inhibit the activated cytosolic and particulate PKC at very low concentrations. Activation of PKC is one of the means of conferring radioresistance on a tumour cell. Suppression of PKC activity by phenolics may be one of the means of preventing the development of radioresistance following radiotherapy.
authors.affiliation: Radiation Biology Division, Bhabha Atomic Research Center, Mumbai, Maharashtra, India.
authors.forename: P
authors.initials: P
authors.lastname: Varadkar
authors.forename: P
authors.initials: P
authors.lastname: Dubey
authors.forename: M
authors.initials: M
authors.lastname: Krishna
authors.forename: N
authors.initials: N
authors.lastname: Verma
mesh_terms: D000818:Animals; D003474:Curcumin / Q000494:pharmacology; D003600:Cytosol / Q000201:enzymology / Q000528:radiation effects; D004610:Ellagic Acid / Q000494:pharmacology; D008297:Male; D051379:Mice; D010636:Phenols / Q000494:pharmacology*; D011493:Protein Kinase C / Q000187:drug effects* / Q000528:radiation effects*; D011794:Quercetin / Q000494:pharmacology
chemical_list: D010636:Phenols; D004610:Ellagic Acid; D011794:Quercetin; D011493:Protein Kinase C; D003474:Curcumin