Lutropin alfa is a recombinant human luteinizing hormone produced in yeast with 2 subunits, alpha = ninety two residues, beta = 121 residues. it's miles a heterodimeric glycoprotein. every monomeric unit is a glycoprotein molecule. In ladies, an acute rise of LH ("LH surge") triggers ovulation and the development of the corpus luteum. In males, it stimulates Leydig cellular manufacturing of testosterone. Lutropin alfa turned into the primary and only recombinant human form of luteinizing hormone (LH) advanced for use within the stimulation of follicular improvement.
Used to facilitate female conception, lutropin alfa performs the same actions as luteinizing hormone (LH), which is normally produced in the pituitary gland. Lutropin is usually given in combination with follitropin alfa. Together they stimulate the development of a follicle to prepare the reproductive tract for implementation and pregnancy. Lutropin alfa also stimulates the theca cells to produce androgens and the secretion of estradiol by the follicles. Lutropin alfa and follitropin alfa are discontinued once ultrasound assessment and serum estradiol concentrations show sufficient follicular maturation. hCG is then administered to complete follicular maturation and induce ovulation. In females, a LH surge about halfway through the menstrual cycle triggers the onset of ovulation. Lutropin alfa substitutes for endogenous LH and induces rupture of the preovulatory ovarian follicle and oocyte expulsion. Lutropin alfa induces and maintains the corpus luteum, which then secretes progesterone.
For treatment of infertility in women with hypothalamic or pituitary insufficiency (hypogonadotropic hypogonadism) and profound LH deficiency (LH <1.2 international units [IU]/L)
Luteinizing hormone binds to a receptor shared with the human chorionic gonadotropin hormone (hCG) on the ovarian theca (and granulosa) cells and testicular Leydig cells. This LH/CG transmembrane receptor is a member of the super-family of G protein-coupled receptors. Adenylate cyclase then activates many other pathways leading to steroid hormone production and other follicle maturation processes.