Altered ovarian follicle function in ACTH-treated gilts

Viveiros, M.M.; Liptrap, R.M.

doi:10.1016/0378-4320(95)01404-n

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…However, DXM injections were able to enhance the concentration of both E 1 in the fluid and A 4 in the walls of small follicles. This can be explained by possible changes in conversion of these "pro" hormones to E 2 and T, respectively, as suggested previously by Viveiros and Liptrap [41]. There is a l a c k o f d a t a c o n c e r n i n g t h e i n f l u e n c e o f catecholamines on the amount and/or activity of enzymes crucial for the synthesis of androgens and estrogens.…”

Section: Discussionsupporting

confidence: 52%

Dexamethasone-induced Changes in Sympathetic Innervation of Porcine Ovaries and in Their Steroidogenic Activity

Jana

Dzienis

Rogozinska

et al. 2005

Journal of Reproduction and Development

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Abstract. The aim of the present study was to determine changes in the density of sympathetic nerves in porcine ovaries with dexamethasone (DXM)-induced cysts and the alterations in steroidogenic activity and amounts of catecholamines in the affected gonads. Cystic ovaries were supplied by numerous sympathetic nerve fibers. The amount of noradrenaline in the cysts (fluid, wall) was significantly higher than in the large follicles of the control group. After DXM injections, the amounts of noradrenaline and adrenaline significantly increased in the walls of small and medium-sized follicles. In the cysts (fluid, wall) the levels of androgens and estrogens were significantly lower, whereas progesterone was higher in the cystic wall. DXM administration led to a significant increase in the estrone content in the fluid of small follicles. Moreover, a decrease in the amounts of progesterone and androgens was found in the follicular fluid and walls of medium-sized follicles. DXM injections resulted in a significant increase in the immunoexpression of P450scc and 3β-HSD in the cysts, a significant increase of P450scc in the follicles, and a decrease of 3β-HSD and P450arom. The present study shows that the DXM treatment leads to an increase in the density of intraovarian sympathetic nerves, paralleled by the amount of catecholamines, and that it is capable of changing the steroidogenic activity of porcine ovary bearing cysts. Thus, it appears possible that these events may be, at least partly, involved in the pathogenesis of this disorder.

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Section: Discussionsupporting

confidence: 52%

Dexamethasone-induced Changes in Sympathetic Innervation of Porcine Ovaries and in Their Steroidogenic Activity

Jana

Dzienis

Rogozinska

et al. 2005

Journal of Reproduction and Development

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“…Thus, preventing turtles from basking and properly thermoregulating could lead to many physiological consequences. Negative effects may include altered levels of circulating steroid hormones (Licht , Moberg , Greenburg and Wingfield , Mahmoud et al , Sapolsky et al ), decreased internal body temperature preventing optimal metabolic activity (Boyer ), compromised immune system from chronically elevated glucocorticoid levels (Apanius , Sapolsky et al ), and potential impairment of the reproductive system (Mahmoud et al , Viveiros and Liptrap ).…”

mentioning

confidence: 99%

Effects of human disturbance on the behavior and physiology of an imperiled freshwater turtle

2013

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The effect of human disturbance on wildlife is of increasing interest because of the growing use of wildlands by humans for recreation. Few studies have documented the effect of human disturbance on behavior and physiology simultaneously, with no studies existing for any turtle species. Turtles are one of the most endangered taxonomic groups and many are of conservation concern, including the yellow‐blotched sawback (Graptemys flavimaculata), a freshwater turtle of the Pascagoula River system, Mississippi, USA. We studied G. flavimaculata individual‐ and population‐level basking behavior, while also documenting the effects of human disturbance on basking behavior at recreationally disturbed and control sites. We also assessed the physiological response of turtles to human disturbance by measuring heterophil/lymphocyte levels (H:L; higher levels indicate increased stress) and shell condition of captured turtles at the 2 sites. At the individual level, disturbed turtles at the recreationally disturbed site basked for significantly shorter durations than undisturbed turtles at the same site and undisturbed turtles at the control site; disturbed turtles at the control site basked longer than all groups possibly because the few instances of disturbances all occurred during a time of year when basking durations were longest. At the population level, we detected significantly lesser basking percentages at the recreationally disturbed site relative to the control site, possibly because of natural differences among the sites (i.e., a more stable thermal environment) or because of the higher level of human disturbance. At the recreationally disturbed site, more disturbances occurred on weekend and weekend bordering days relative to weekdays, and larger and slower boats disturbed significantly greater percentages of basking turtles compared to smaller and faster watercraft. Further, turtles from the disturbed site had significantly higher H:L levels relative to the undisturbed site, and an index of shell condition was significantly poorer at the disturbed site. Boating records indicate that the impact of recreational boating at the disturbed site likely has grown over the last 22 years because of an increase in the number and size of boats using the river; this trend will likely continue unless restrictions are enacted by managers and/or state entities to limit the number and size of boats that access the river. © 2013 The Wildlife Society.

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Administration of recombinant porcine somatotropin (rpST) changes hormone and metabolic status during early pregnancy

Schneider

Kanitz

Gerrard

et al. 2002

Domestic Animal Endocrinology

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Altered ovarian follicle function in ACTH-treated gilts

Cited by 4 publications

References 34 publications

Dexamethasone-induced Changes in Sympathetic Innervation of Porcine Ovaries and in Their Steroidogenic Activity

Dexamethasone-induced Changes in Sympathetic Innervation of Porcine Ovaries and in Their Steroidogenic Activity

Effects of human disturbance on the behavior and physiology of an imperiled freshwater turtle

Administration of recombinant porcine somatotropin (rpST) changes hormone and metabolic status during early pregnancy

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