Limits...
Sympathetic nerve activity in normal and cystic follicles from isolated bovine ovary: local effect of beta-adrenergic stimulation on steroid secretion.

Paredes AH, Salvetti NR, Diaz AE, Dallard BE, Ortega HH, Lara HE - Reprod. Biol. Endocrinol. (2011)

Bottom Line: Cystic follicles which present an area 600 fold greater compared with preovulatory follicles has only 10 times less concentration of NE as compared with small antral and preovulatory follicles but they had 10 times more NE in follicular fluid, suggesting a high efflux of neurotransmitter from the cyst wall.This suggestion was reinforced by the high basal release of recently taken-up 3H-NE found in cystic follicles.While lower levels of beta-adrenergic receptor were found in cystic follicles, there was a heightened response to the beta-adrenergic agonist isoproterenol and to hCG, as measured by testosterone secretion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Neurobiochemistry, Department of Biochemistry and Molecular Biology, Faculty of Chemistry and Pharmaceutical Sciences, Universidad de Chile, Santiago, Chile. aparedes@ciq.uchile.cl

ABSTRACT
Cystic ovarian disease (COD) is an important cause of abnormal estrous behavior and infertility in dairy cows. COD is mainly observed in high-yielding dairy cows during the first months post-partum, a period of high stress. We have previously reported that, in lower mammals, stress induces a cystic condition similar to the polycystic ovary syndrome in humans and that stress is a definitive component in the human pathology. To know if COD in cows is also associated with high sympathetic activity, we studied isolated small antral (5 mm), preovulatory (10 mm) and cystic follicles (25 mm). Cystic follicles which present an area 600 fold greater compared with preovulatory follicles has only 10 times less concentration of NE as compared with small antral and preovulatory follicles but they had 10 times more NE in follicular fluid, suggesting a high efflux of neurotransmitter from the cyst wall. This suggestion was reinforced by the high basal release of recently taken-up 3H-NE found in cystic follicles. While lower levels of beta-adrenergic receptor were found in cystic follicles, there was a heightened response to the beta-adrenergic agonist isoproterenol and to hCG, as measured by testosterone secretion. There was however an unexpected capacity of the ovary in vitro to produce cortisol and to secrete it in response to hCG but not to isoproterenol. These data suggest that, during COD, the bovine ovary is under high sympathetic nerve activity that in addition to an increased response to hCG in cortisol secretion could participate in COD development.

Show MeSH

Related in: MedlinePlus

Concentration of noradrenaline in ovarian follicular fluid and follicular wall. In A is shown the concentration of the noradrenaline content in follicular fluid and B is shown the concentration in the follicular walls, as well as in the small antral (SA), preovulatory (PO) and cystic follicular wall (cystic). Values represent mean value ± SEM of the number of samples with four individual follicles per experimental group, *, p < 0.05 vs. SA and PO.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3117772&req=5

Figure 2: Concentration of noradrenaline in ovarian follicular fluid and follicular wall. In A is shown the concentration of the noradrenaline content in follicular fluid and B is shown the concentration in the follicular walls, as well as in the small antral (SA), preovulatory (PO) and cystic follicular wall (cystic). Values represent mean value ± SEM of the number of samples with four individual follicles per experimental group, *, p < 0.05 vs. SA and PO.

Mentions: We measured NE concentration in each type of follicle (Figure 2B). Although there was no difference between SA and PO follicles, there was a > 90% decrease in NE concentration in the walls of the follicular cysts. To determine whether this difference was due to a change in the compartmentalization of NE, we also measured the NE concentration in the follicular fluid (Figure 2A). There was no difference in NE concentration (expressed as ng NE/μ l of follicular fluid) in follicular liquid obtained from SA, PO and cystic follicles.


Sympathetic nerve activity in normal and cystic follicles from isolated bovine ovary: local effect of beta-adrenergic stimulation on steroid secretion.

Paredes AH, Salvetti NR, Diaz AE, Dallard BE, Ortega HH, Lara HE - Reprod. Biol. Endocrinol. (2011)

Concentration of noradrenaline in ovarian follicular fluid and follicular wall. In A is shown the concentration of the noradrenaline content in follicular fluid and B is shown the concentration in the follicular walls, as well as in the small antral (SA), preovulatory (PO) and cystic follicular wall (cystic). Values represent mean value ± SEM of the number of samples with four individual follicles per experimental group, *, p < 0.05 vs. SA and PO.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3117772&req=5

Figure 2: Concentration of noradrenaline in ovarian follicular fluid and follicular wall. In A is shown the concentration of the noradrenaline content in follicular fluid and B is shown the concentration in the follicular walls, as well as in the small antral (SA), preovulatory (PO) and cystic follicular wall (cystic). Values represent mean value ± SEM of the number of samples with four individual follicles per experimental group, *, p < 0.05 vs. SA and PO.
Mentions: We measured NE concentration in each type of follicle (Figure 2B). Although there was no difference between SA and PO follicles, there was a > 90% decrease in NE concentration in the walls of the follicular cysts. To determine whether this difference was due to a change in the compartmentalization of NE, we also measured the NE concentration in the follicular fluid (Figure 2A). There was no difference in NE concentration (expressed as ng NE/μ l of follicular fluid) in follicular liquid obtained from SA, PO and cystic follicles.

Bottom Line: Cystic follicles which present an area 600 fold greater compared with preovulatory follicles has only 10 times less concentration of NE as compared with small antral and preovulatory follicles but they had 10 times more NE in follicular fluid, suggesting a high efflux of neurotransmitter from the cyst wall.This suggestion was reinforced by the high basal release of recently taken-up 3H-NE found in cystic follicles.While lower levels of beta-adrenergic receptor were found in cystic follicles, there was a heightened response to the beta-adrenergic agonist isoproterenol and to hCG, as measured by testosterone secretion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Neurobiochemistry, Department of Biochemistry and Molecular Biology, Faculty of Chemistry and Pharmaceutical Sciences, Universidad de Chile, Santiago, Chile. aparedes@ciq.uchile.cl

ABSTRACT
Cystic ovarian disease (COD) is an important cause of abnormal estrous behavior and infertility in dairy cows. COD is mainly observed in high-yielding dairy cows during the first months post-partum, a period of high stress. We have previously reported that, in lower mammals, stress induces a cystic condition similar to the polycystic ovary syndrome in humans and that stress is a definitive component in the human pathology. To know if COD in cows is also associated with high sympathetic activity, we studied isolated small antral (5 mm), preovulatory (10 mm) and cystic follicles (25 mm). Cystic follicles which present an area 600 fold greater compared with preovulatory follicles has only 10 times less concentration of NE as compared with small antral and preovulatory follicles but they had 10 times more NE in follicular fluid, suggesting a high efflux of neurotransmitter from the cyst wall. This suggestion was reinforced by the high basal release of recently taken-up 3H-NE found in cystic follicles. While lower levels of beta-adrenergic receptor were found in cystic follicles, there was a heightened response to the beta-adrenergic agonist isoproterenol and to hCG, as measured by testosterone secretion. There was however an unexpected capacity of the ovary in vitro to produce cortisol and to secrete it in response to hCG but not to isoproterenol. These data suggest that, during COD, the bovine ovary is under high sympathetic nerve activity that in addition to an increased response to hCG in cortisol secretion could participate in COD development.

Show MeSH
Related in: MedlinePlus