title: Protective effect of RH-3 with special reference to radiation induced micronuclei in mouse bone marrow.
abstract: Effect of pre-irradiation administration of different doses of RH-3, the herbal preparation of an Indian medicinal plant Hippophae rhamnoides, 30 min before 10 Gy whole body gamma irradiation was studied. Doses between 25 to 35 mg/kg body wt. were found to render > 80 % survival in mice. In order to investigate whether RH-3 protected against radiation induced genotoxicity, mice were administered different doses of RH-3, 30 min before 2 Gy dose and compared with untreated, RH-3 treated and irradiated controls. The bone marrow cells were collected at different time intervals following various treatments and processed for scoring micronuclei (MN). Administration of RH-3 alone did not enhance the MN frequency as compared to the control, and radiation dose of 2 Gy significantly enhanced the MN frequency (3.1 %, P < 0.01). Pre-irradiation treatment with RH-3, however, reduced the radiation induced MN frequency in a drug dose dependent manner suggesting its radioprotective efficacy. The protective effect of RH-3 on radiation induced perturbations in cell cycle progression was studied flowcytometrically in mouse bone marrow cells. RH-3 treatment (30 mg/kg body wt.) enhanced DNA synthesis (S-phase) in unirradiated controls and also countered radiation induced depression of S-phase to facilitate replenishment of cells lost due to radiation injury.
authors.affiliation: Radiation Biology Division, Institute of Nuclear Medicine and Allied Sciences, Lucknow Marg, Delhi 110 054, India.
authors.forename: P K
authors.initials: PK
authors.lastname: Agrawala
authors.forename: H C
authors.initials: HC
authors.lastname: Goel
mesh_terms: D000818:Animals; D016587:Antimutagenic Agents / Q000494:pharmacology*; D001853:Bone Marrow / Q000187:drug effects* / Q000528:radiation effects / Q000648:ultrastructure; D031281:Hippophae / Q000737:chemistry; D008297:Male; D051379:Mice; D048629:Micronuclei, Chromosome-Defective; D010936:Plant Extracts / Q000494:pharmacology*; D011837:Radiation-Protective Agents / Q000494:pharmacology*
chemical_list: D016587:Antimutagenic Agents; D010936:Plant Extracts; D011837:Radiation-Protective Agents