title: In vivo corticosterone administration at levels occurring with intense exercise does not induce intestinal lymphocyte apoptosis in mice.
abstract: Intestinal lymphocyte apoptosis can occur following physiological and pathophysiological stress as well as exhaustive exercise. In this study we investigated whether corticosterone (CORT) administration at physiological concentrations observed following strenuous exercise induces intestinal lymphocyte apoptosis and cell loss in mice. CORT injection (14 mg/kg; i.p.) caused a four-fold increase in plasma CORT concentrations, but did not affect intestinal lymphocyte cell loss or alter baseline intestinal lymphocyte apoptosis, as measured by phosphatidylserine externalization, cell viability, mitochondrial membrane depolarization, caspase 3, Bcl-2 and cytosolic cytochrome c protein levels. These findings indicate that CORT at levels observed following strenuous exercise is not involved in intestinal lymphocyte apoptosis and cell loss.
authors.affiliation: Department of Health Studies and Gerontology, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: J
authors.initials: J
authors.lastname: Quadrilatero
authors.forename: L
authors.initials: L
authors.lastname: Hoffman-Goetz
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000704:Analysis of Variance; D000818:Animals; D017304:Annexin A5 / Q000378:metabolism; D015703:Antigens, CD / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects*; D001562:Benzimidazoles / Q000378:metabolism; D015153:Blotting, Western / Q000379:methods; D002232:Carbocyanines / Q000378:metabolism; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D003345:Corticosterone / Q000008:administration & dosage* / Q000097:blood; D045304:Cytochromes c / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D005978:Glutathione / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D007422:Intestines / Q000166:cytology*; D008214:Lymphocytes / Q000187:drug effects*; D008564:Membrane Potentials / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D008928:Mitochondria / Q000187:drug effects; D010641:Phenotype; D010805:Physical Conditioning, Animal; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D013997:Time Factors
chemical_list: D017304:Annexin A5; D015703:Antigens, CD; D001562:Benzimidazoles; D002232:Carbocyanines; D019253:Proto-Oncogene Proteins c-bcl-2; C068624:5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolocarbocyanine; D045304:Cytochromes c; D006861:Hydrogen Peroxide; C505409:Casp3 protein, mouse; D053148:Caspase 3; D020169:Caspases; D005978:Glutathione; D003345:Corticosterone; D000111:Acetylcysteine