Pharmacologic blockade of nicotinic receptors in the suprachiasmatic nucleus increases ovarian atresia and inhibits follicular growth.

Reproduction in all mammalian species depends on the growth and maturation of ovarian follicles, that is, folliculogenesis. Follicular development can culminate with the rupture of mature follicles and the consequent expulsion of their oocytes (ovulation) or in atresia, characterized by the arrest of development and eventual degeneration. These processes are regulated by different neuroendocrine signals arising at different hypothalamic nuclei, including the suprachiasmatic nucleus (SCN).

Suprachiasmatic nucleus and vagus nerve trigger preovulatory LH and ovulation.

In Brief: In the proestrus day, the neural and endocrine signals modulate ovarian function. This study shows vagus nerve plays a role in the multisynaptic pathways of communication between the suprachiasmatic nucleus and the ovaries where such neural information determines ovulation.

Abstract: The suprachiasmatic nucleus (SCN) regulates the activity of several peripheral organs through a parasympathetic-sympathetic pathway.

Participation of the Cholinergic System in the Development of Polycystic Ovary Syndrome.

In rats with polycystic ovary syndrome (PCOS) induced by injection of estradiol valerate (EV), unilateral or bilateral section of the vagus nerve restores ovulatory function in 75% of animals, suggesting that the vagus nerve participates in the development of PCOS. Since the vagus nerve is a mixed nerve through which mainly cholinergic-type information passes, the objective of the present study was to analyze whether acetylcholine (ACh) is involved in the development of PCOS. Ten-day-old rats were injected with 2.

Comparison of hepatic resection and hepatic transplantation in the treatment of hepatocellular carcinoma among cirrhotic patients.

Background: The benefits of hepatic transplantation (HT) compared with hepatic resection (HR) in treating hepatocellular carcinoma (HCC) in patients with cirrhosis are controversial. The aim of this study was to compare the results of these therapeutic options.

Methods: The charts of all patients with cirrhosis who underwent HR or HT for HCC between 1997 and 2000 were analyzed.