title: Susceptibility of irradiated bovine aortic endothelial cells to injury.
abstract: Using cultured bovine aortic endothelial cells (BAEC), the authors attempted to determine whether prior irradiation would alter the susceptibility of these cells to three known injurious stimuli and, if so, whether the alteration would be related to radiation dose. BAEC were irradiated with 0, 5, or 10 Gy of gamma rays and, on the third postirradiation day, exposed to fibrin, nicotine, or bacterial endotoxin (lipopolysaccharide, LPS). Release of prelabeled 51Cr, representing cell lysis, cell detachment, or a combination of the two, was determined. Significant differences between irradiated and control cells were determined by using paired Student's t-tests. Irradiation did not appear to have altered the sensitivity of BAEC to fibrin-induced injury. Cells irradiated with 10 Gy of gamma rays, but generally not those irradiated with half this dose, showed a heightened susceptibility to nicotine. Contrary to the nicotine results, irradiated cells showed less cell detachment and lysis after exposure to LPS. These results suggest that the susceptibility of irradiated BAEC to harmful stimuli depends largely on the nature of the stimulus as well as the radiation dose.
authors.affiliation: Department of Pathology, Northwestern University School of Medicine, Chicago, Illinois 60611.
authors.forename: M H
authors.initials: MH
authors.lastname: Zhou
authors.forename: Q
authors.initials: Q
authors.lastname: Dong
authors.forename: C
authors.initials: C
authors.lastname: Ts'ao
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology / Q000502:physiology / Q000528:radiation effects*; D001018:Aortic Diseases / Q000139:chemically induced* / Q000473:pathology; D002417:Cattle; D004247:DNA / Q000032:analysis; D004198:Disease Susceptibility; D004730:Endothelium, Vascular / Q000166:cytology / Q000502:physiology / Q000528:radiation effects*; D005337:Fibrin / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D009538:Nicotine / Q000494:pharmacology; D011506:Proteins / Q000032:analysis
chemical_list: D008070:Lipopolysaccharides; D011506:Proteins; D009538:Nicotine; D005337:Fibrin; D004247:DNA