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Decreased spermatogenic and androgenic testicular functions in adult rats submitted to immobilization-induced stress from prepuberty BJMBR
Almeida,S.A.; Petenusci,S.O.; Anselmo-Franci,J.A.; Rosa-e-Silva,A.A.M.; Lamano-Carvalho,T.L..
We investigated whether chronic stress applied from prepuberty to full sexual maturity interferes with spermatogenic and androgenic testicular functions. Male Wistar rats (40 days old) were immobilized 6 h a day for 60 days. Following immobilization, plasma concentrations of corticosterone and prolactin increased 135% and 48%, respectively, while plasma luteinizing hormone and testosterone presented a significant decrease of 29% and 37%, respectively. Plasma concentration of follicle-stimulating hormone was not altered in stressed rats. Chronic stress reduced the amount of mature spermatids in the testis by 16% and the spermatozoon concentration in the cauda epididymidis by 32%. A 17% reduction in weight and a 42% decrease in DNA content were observed in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Immobilization; Spermatogenesis; LH; FSH; Testosterone; Prolactin.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100013
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Hormonal therapy with estradiol and drospirenone improves endothelium-dependent vasodilation in the coronary bed of ovariectomized spontaneously hypertensive rats BJMBR
Borgo,M.V.; Claudio,E.R.G.; Silva,F.B.; Romero,W.G.; Gouvea,S.A.; Moysés,M.R.; Santos,R.L.; Almeida,S.A.; Podratz,P.L.; Graceli,J.B.; Abreu,G.R..
Drospirenone (DRSP) is a progestin with anti-aldosterone properties and it reduces blood pressure in hypertensive women. However, the effects of DRSP on endothelium-dependent coronary vasodilation have not been evaluated. This study investigated the effects of combined therapy with estrogen (E2) and DRSP on endothelium-dependent vasodilation of the coronary bed of ovariectomized (OVX) spontaneously hypertensive rats. Female spontaneously hypertensive rats (n=87) at 12 weeks of age were randomly divided into sham operated (Sham), OVX, OVX treated with E2 (E2), and OVX treated with E2 and DRSP (E2+DRSP) groups. Hemodynamic parameters were directly evaluated by catheter insertion into the femoral artery. Endothelium-dependent vasodilation in response to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Menopause; Hypertension; Hormone therapy; Drospirenone; Coronary reactivity.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000100601
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Sexual behavior and fertility of male rats submitted to prolonged immobilization-induced stress BJMBR
Almeida,S.A.; Kempinas,W.G.; Lamano Carvalho,T.L..
In order to investigate whether prolonged stress interferes with the onset of sexual behavior at puberty and with fertility at adulthood, prepubertal male Wistar rats (40 days of age) were immobilized 6 h a day for 15 days (up to early puberty) or for 60 days (until sexual maturity). Pubertal stressed rats showed a two-fold increase in the latency for the first mount (probably due to repeated aversive experience in which a change of environment was always followed by immobilization) and a 2.5-fold increase in the frequency of thrusting (indicative of enhanced sexual performance). The apparently stimulatory effect of prolonged stress on the onset of sexual behavior is discussed in terms of increased testosterone level and interference with the complex...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Immobilization stress; Sexual behavior; Male fertility.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000900019
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Swimming training prevents coronary endothelial dysfunction in ovariectomized spontaneously hypertensive rats BJMBR
Claudio,E.R.G.; Almeida,S.A.; Mengal,V.; Brasil,G.A.; Santuzzi,C.H.; Tiradentes,R.V.; Gouvea,S.A.; Bissoli,N.S.; Santos,R.L.; Abreu,G.R..
Estrogen deficiency and hypertension are considered major risk factors for the development of coronary heart disease. On the other hand, exercise training is considered an effective form to prevent and treat cardiovascular diseases. However, the effects of swimming training (SW) on coronary vascular reactivity in female ovariectomized hypertensive rats are not known. We aimed to evaluate the effects of SW on endothelium-dependent coronary vasodilation in ovariectomized hypertensive rats. Three-month old spontaneously hypertensive rats (SHR, n=50) were divided into four groups: sham (SH), sham plus swimming training (SSW), ovariectomized (OVX), and ovariectomized plus swimming training (OSW). The SW protocol (5 times/week, 60 min/day) was conducted for 8...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Swimming training; Ovariectomy; Coronary reactivity; Oxidative stress; Antioxidant enzymes.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000100607
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