Obestatin directly controls chicken ovarian cell functions

Area of Science:

• Reproductive Biology
• Endocrinology
• Cell Biology

Background:

• Obestatin, a peptide hormone, is known to play roles in various physiological processes.
• Its specific functions within avian ovarian cells, particularly granulosa cells, require further elucidation.

Purpose of the Study:

• To investigate the in vitro effects of obestatin on avian ovarian granulosa cell proliferation, apoptosis, and secretory activity.
• To examine obestatin's influence on hormone release (progesterone, testosterone, estradiol) from cultured granulosa cells and ovarian follicular fragments.

Main Methods:

• In vitro study using cultured chicken ovarian granulosa cells and follicular fragments.
• Obestatin was added at concentrations of 0.1, 10, or 100 ng/ml.
• Proliferation and apoptosis markers were assessed using immunocytochemistry and Western immunoblotting.
• Hormone release was quantified using Enzyme Immunoassay (EIA).

Main Results:

• Obestatin inhibited proliferation markers (PCNA, cyclin B1) but not MAPK/ERK1,2 in granulosa cells.
• Obestatin promoted apoptosis markers (TdT, bax, caspase 3) in granulosa cells.
• Obestatin suppressed progesterone, testosterone, and estradiol release from granulosa cells.
• Conversely, obestatin promoted progesterone, testosterone, and estradiol release from ovarian follicular fragments.

Conclusions:

• Obestatin directly controls avian ovarian cell proliferation, apoptosis, and hormone release.
• The interplay between theca and granulosa cells modulates obestatin's effect on ovarian secretory activity.