title: Effect of treadmill exercise on blood glucose, serum corticosterone levels and glucocorticoid receptor immunoreactivity in the hippocampus in chronic diabetic rats.
abstract: Abnormal excess of glucocorticoid is one of feature characteristics in type 2 diabetes. In the present study, we investigated the effect of treadmill exercise at chronic diabetic stages on glucocorticoid receptor (GR) immunoreactivity in the hippocampal CA1 region and dentate gyrus, which are very vulnerable to diabetes. For this study, we used Zucker diabetic fatty (ZDF) rats and Zucker lean control (ZLC) rats. Twenty-three-week-old ZLC and ZDF rats were put on the treadmill with or without running for 7 weeks and sacrificed at 30 weeks of age. Treadmill exercise significantly decreased diabetes-induced blood glucose and serum corticosteroid levels although they did not drop to control levels. In sedentary ZLC rats, GR immunoreactivity was detected in pyramidal cells of the CA1 region as well as in granule cells of the dentate gyrus. In the sedentary ZDF rats, GR immunoreactivity was significantly increased in these regions. However, treadmill exercise significantly decreased GR immunoreactivity in these regions. These results indicate that treadmill exercise in chronic diabetic rats significantly decreased GR immunoreactivity in the hippocampal CA1 region and dentate gyrus, although blood glucose and serum corticosteroid levels did not fully recover to normal state.
authors.affiliation: Department of Anatomy and Cell Biology, College of Veterinary Medicine, Seoul National University, Seoul, South Korea.
authors.forename: In Koo
authors.initials: IK
authors.lastname: Hwang
authors.forename: Sun Shin
authors.initials: SS
authors.lastname: Yi
authors.forename: Ki-Yeon
authors.initials: KY
authors.lastname: Yoo
authors.forename: Ok Kyu
authors.initials: OK
authors.lastname: Park
authors.forename: Bingchun
authors.initials: B
authors.lastname: Yan
authors.forename: Wook
authors.initials: W
authors.lastname: Song
authors.forename: Moo-Ho
authors.initials: MH
authors.lastname: Won
authors.forename: Yeo Sung
authors.initials: YS
authors.lastname: Yoon
authors.forename: Je Kyung
authors.initials: JK
authors.lastname: Seong
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D003345:Corticosterone / Q000097:blood*; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism*; D005260:Female; D006624:Hippocampus / Q000033:anatomy & histology / Q000378:metabolism*; D006801:Humans; D008297:Male; D010805:Physical Conditioning, Animal; D011897:Random Allocation; D051381:Rats; D011924:Rats, Zucker; D011965:Receptors, Glucocorticoid / Q000378:metabolism*
chemical_list: D001786:Blood Glucose; D011965:Receptors, Glucocorticoid; D003345:Corticosterone