Selection of the species-specific number of follicles that will develop and ovulate during the ovarian cycle can be overridden by increasing the levels of pituitary gonadotropin hormones, FSH and LH. During controlled ovarian stimulation (COS) in nonhuman primates for assisted reproductive technology (ART) protocols, the method of choice (but not the only method) has been the administration of ...

OBJECTIVE Production of the appropriate pattern of gonadotrophin levels is crucial to proper functioning of the female reproductive system. We aimed to establish whether the pituitary has invariant secretory characteristics when isolated from in vivo controls. We aimed to obtain information during both the rising and declining phases of the gonadotrophin surge. DESIGN This study investigated ...

INTRODUCTION plurihormonality of pituitary adenomas is an ability of adenoma cells to produce more than one hormone. After the immunohistochemical analysis had become a routine part of the morphological study, a great number of adenomas appeared to be multihormonal in actual practice. We hypothesize that the same cells of a normal pituitary gland releases several hormones simultaneously. OBJE...

Secretion of the neuroendocrine marker neuron-specific enolase by 24 pituitary tumours was measured in maintenance tissue culture. Eleven endocrine-active and 13 "functionless" tumours were defined by measurement of prolactin, growth hormone, luteinising hormone (LH) and follicle stimulating hormone (FSH) secretion rates in vitro and the corresponding plasma hormone levels. Measurement of prola...

Assay of frequently collected blood samples in four mature Hereford bulls indicated the existence of a tonic mechanism for the secretion of luteinizing hormone (LH) and follicle stimulating hormone (FSH), i.e., their episodic release was not observed. Increased plasma concentrations of LH and FSH, however, were obtained in response to an intravenous injection of 500 vg of gonadotropin releasing...

756 VOL 57, NO 11 / NOVEMBER 2008 THE JOURNAL OF FAMILY PRACTICE FAST TRACK Experts recommend a repeat morning testosterone level, plus testing levels of FSH, LH, and prolactin to evaluate the cause of low testosterone Obtain a repeat morning testosterone level, as well as levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), and prolactin to help understand the cause of low t...

Subcutaneous self-administration of synthetic gonadotrophin-releasing hormone 500 lAg eight-hourly for up to one year by 12 male patients (five prepubertal) with clinical hypogonadism due to hypothalamic or pituitary disease resulted in the synthesis and continued release ofluteinizing hormone (LH) and follicle-stimulating hormone (FSH). There was a rise in circulating androgen levels in all pa...

The steroid hormone estradiol, and the glycoprotein hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH), are known to be essential for the growth and differentiation of follicles in the ovary. The present study was conducted to determine quantitatively the effects of estradiol, FSH and LH on proliferation of different ovarian cell types (granulosa and theca cells). The imma...

OBJECTIVE A sex difference in fetal and neonatal pituitary-gonadal function has been well documented. The aim of the following study was to determine sex differences and patterns of basal LH/FSH in the neonatal period. DESIGN Peripheral venous blood was obtained from 164 healthy full term newborns (91 males, 73 females) for clinically indicated laboratory examinations. RESULTS In male newbo...