title: Effects of pre-treatment with sodium butyrate on the frequencies of X-ray-induced chromosomal aberrations in human peripheral blood lymphocytes.
abstract: The effects of sodium butyrate-mediated alterations in chromatin structure on the yields of X-ray-induced chromosomal aberrations were studied in human peripheral blood lymphocytes. Unstimulated (G0) lymphocytes were pre-treated with sodium butyrate (5 mM) for 24 h, X-irradiated and then stimulated to pass through the cell cycle. Cells in their first post-radiation metaphase were scored for chromosomal aberrations. In parallel biochemical experiments nucleoid sedimentation technique was used to examine the induction and repair of DNA-strand breaks. The results show that sodium butyrate pre-treatment leads to a significant increase in the frequencies of dicentrics and rings, but not of fragments. The data from biochemical studies suggest that the numbers and rates of repair of X-ray-induced DNA-strand breaks are the same in butyrate-treated and untreated cells. We therefore suggest that the observed effect is probably a consequence of butyrate-induced conformational changes in the chromatin of G0 lymphocytes.
mesh_terms: D002087:Butyrates / Q000494:pharmacology*; D020148:Butyric Acid; D002453:Cell Cycle; D002478:Cells, Cultured; D002843:Chromatin / Q000187:drug effects* / Q000528:radiation effects / Q000648:ultrastructure; D002869:Chromosome Aberrations; D003561:Cytarabine / Q000494:pharmacology; D004260:DNA Repair / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000187:drug effects* / Q000528:radiation effects; D014965:X-Rays
chemical_list: D002087:Butyrates; D002843:Chromatin; D003561:Cytarabine; D020148:Butyric Acid