title: Aging-induced alterations in female rat colon smooth muscle: the protective effects of hormonal therapy.
abstract: Aging is associated to oxidative damage and alterations in inflammatory and apoptotic pathways. Aging impairs secretion of several hormones, including melatonin and estrogens. However, the mechanisms involved in aging of smooth muscle are poorly known. We have studied the changes induced by aging in the colonic smooth muscle layer of female rats and the protective effect of hormonal therapy. We used young, aged, and ovariectomized aged female rats. Two groups of ovariectomized rats (22 months old) were treated either with melatonin or with estrogen for 10 weeks before sacrifice. Aging induced oxidative imbalance, evidenced by H(2)O(2) accumulation, lipid peroxidation, and decreased catalase activity. The oxidative damage was enhanced by ovariectomy. In addition, aged colonic muscle showed enhanced expression of the pro-inflammatory enzyme cyclooxygenase 2. Expression of the activated forms of caspases 3 and 9 was also enhanced in aged colon. Melatonin and estrogen treatment prevented the oxidative damage and the activation of caspases. In conclusion, aging of colonic smooth muscle induces oxidative imbalance and activation of apoptotic and pro-inflammatory pathways. Hormonal therapy has beneficial effects on the oxidative and apoptotic changes associated to aging in this model.
authors.affiliation: Department of Physiology, Nursing School, University of Extremadura, 10071 Caceres, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Pascua
authors.forename: C
authors.initials: C
authors.lastname: Camello-Almaraz
authors.forename: M J
authors.initials: MJ
authors.lastname: Pozo
authors.forename: F E
authors.initials: FE
authors.lastname: Martin-Cano
authors.forename: E
authors.initials: E
authors.lastname: Vara
authors.forename: J A
authors.initials: JA
authors.lastname: Fernández-Tresguerres
authors.forename: P J
authors.initials: PJ
authors.lastname: Camello
mesh_terms: D000375:Aging / Q000187:drug effects*; D000818:Animals; D053148:Caspase 3 / Q000378:metabolism; D053453:Caspase 9 / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D003106:Colon / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000378:metabolism; D004958:Estradiol / Q000031:analogs & derivatives / Q000494:pharmacology / Q000627:therapeutic use; D015914:Estrogen Replacement Therapy; D004966:Estrogens, Conjugated (USP) / Q000494:pharmacology / Q000627:therapeutic use; D005260:Female; D006861:Hydrogen Peroxide / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D008550:Melatonin / Q000494:pharmacology / Q000627:therapeutic use*; D009130:Muscle, Smooth / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D010052:Ovariectomy; D051381:Rats; D017208:Rats, Wistar
chemical_list: D004966:Estrogens, Conjugated (USP); D004958:Estradiol; D008315:Malondialdehyde; D006861:Hydrogen Peroxide; D002374:Catalase; D051546:Cyclooxygenase 2; C489691:Ptgs2 protein, rat; C505410:Casp3 protein, rat; C506435:Casp9 protein, rat; D053148:Caspase 3; D053453:Caspase 9; D008550:Melatonin