title: Marked attenuation of production of collagen type I from cardiac fibroblasts by dehydroepiandrosterone.
abstract: Dehydroepiandrosterone (DHEA) is a type of adrenal steroid. The concentrations of DHEA and its sulfate (DHEA-S) in serum reach a peak between the ages of 25 and 30 yr and thereafter decline steadily. It was reported that DHEA-S concentration in humans is inversely related to death from cardiovascular diseases. In this study, we examined the effects of DHEA on regulation of collagen mRNA and collagen synthesis in cultured cardiac fibroblasts. Treatment with DHEA (10(-6) M) resulted in a significant decrease in procollagen type I mRNA expression compared with controls. This was accompanied by a significant decrease in procollagen type I protein accumulation in the medium and also a significant decrease in procollagen type I protein synthesis in the cellular matrix. Furthermore, to confirm in vitro results, we administered DHEA to Sprague-Dawley rats, which were treated with angiotensin II for 8 wk to induce cardiac damage. Procollagen type I mRNA expression was significantly decreased and cardiac fibrosis significantly inhibited in DHEA-treated rat hearts without lowering the systolic blood pressure. These results strongly indicate that DHEA can directly attenuate collagen type I synthesis at the transcriptional level in vivo and in vitro in cardiac fibroblasts.
authors.affiliation: Division of Endocrinology and Metabolism, Yokohama City Univ. Graduate School of Medicine, 3-9 Fuku-ura, Kanazawa-ku, Yokohama 236-0004, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Iwasaki
authors.forename: Koji
authors.initials: K
authors.lastname: Mukasa
authors.forename: Masato
authors.initials: M
authors.lastname: Yoneda
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ito
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Yamada
authors.forename: Yasumichi
authors.initials: Y
authors.lastname: Mori
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Fujisawa
authors.forename: Toshio
authors.initials: T
authors.lastname: Fujisawa
authors.forename: Koichiro
authors.initials: K
authors.lastname: Wada
authors.forename: Hisahiko
authors.initials: H
authors.lastname: Sekihara
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nakajima
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D049109:Cell Proliferation; D024042:Collagen Type I / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000235:genetics; D003687:Dehydroepiandrosterone / Q000494:pharmacology*; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D006321:Heart / Q000187:drug effects*; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D011347:Procollagen / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D024042:Collagen Type I; D011347:Procollagen; D012333:RNA, Messenger; D003687:Dehydroepiandrosterone