What is GnRH agonist and antagonist?

GnRH agonist acts like GnRH. When GnRH agonist is first given, it causes the pituitary to become more active. However, after a while, the pituitary stops responding to the constant GnRH agonist. By contrast, the GnRH antagonist directly blocks the pituitary from responding to GnRH.

What are GnRH agonists used for?

GnRH agonists (sold under the brand names Lupron, Zoladex, Trelstar, Viadur, Vantas, Eligard and Synarel – see Table below) are drugs that lower male hormones, which has the effect of shrinking prostate tumors or slowing the growth of prostate cancer. This therapy is known as Androgen Deprivation Therapy or ADT.

What does GnRH antagonist do?

A substance that blocks the pituitary gland from making hormones called follicle-stimulating hormone (FSH) and luteinizing hormone (LH). In men, this causes the testicles to stop making testosterone. In women, this causes the ovaries to stop making estrogen and progesterone.

What are GnRH analogs?

GnRH analogues (agonists and antagonists) GnRH analogues are synthetic drugs similar to natural GnRH. Agonists’ mode of action is to stimulate the pituitary gland to secrete FSH and LH. Unlike natural GnRH, which is secreted in a pulsatile manner, synthetic agonists have a constant pharmacokinetic action.

Is Lupron a GnRH antagonist?

Leuprolide injection (Lupron Depot) is also used with other medication to treat anemia (a lower than normal number of red blood cells) caused by uterine fibroids (noncancerous growths in the uterus). Leuprolide injection is in a class of medications called gonadotropin-releasing hormone (GnRH) agonists.

Is Lupron a GnRH agonist or antagonist?

Leuprolide is a medication used in the management and treatment of prostate cancer, endometriosis, uterine fibroids, precocious puberty, and other sex hormone-related conditions. It is in the GnRH agonist class of medications.

What is a hormone analog?

Hormone analogs may act like the endogenous hormone if the analog–receptor complex in the target cell mimics the function of the hormone–receptor complex. Hydroxy metabolites of both o,p′-DDT and methoxychlor bind to estrogen receptors and cause estrogenic effects in birds and reptiles.

How do GnRH agonists reduce testosterone?

ADT suppresses testosterone levels by blocking the hypothalamic–pituitary–gonadal feedback system, thus preventing AR signaling. GnRH agonists achieve this by downregulating GnRH receptors in the pituitary gland, and thereby decreasing the release of LH and testosterone.

What medications are GnRH antagonists?

Currently approved GnRH antagonists include the peptide molecules abarelix, cetrorelix, degarelix, and ganirelix and the small-molecule compounds elagolix and relugolix.

What does a GnRH analogue do when given to a woman?

GnRH analogues are designed to ‘turn off’ the ovaries temporarily and create a temporary ‘menopausal’ state. This is done by blocking the hormones that stimulate the ovaries. This results in a low level of the female hormone oestrogen, which will go back to normal when the treatment is stopped.

How do GnRH agonists suppress estrogen?

They are agonists of the GnRH receptor and work by increasing or decreasing the release of gonadotropins and the production of sex hormones by the gonads. When used to suppress gonadotropin release, GnRH agonists can lower sex hormone levels by 95% in both sexes.

Is Lupron the same as Zoladex?

Zoladex contains the active drug goserelin. Lupron Depot contains the active drug leuprolide. Although they contain different active drugs, Zoladex and Lupron Depot work in the same way. They both block production of certain hormones, including estrogen and testosterone.

What are GnRH agonists and antagonists used for?

They are used off-label for precocious puberty, gender dysphoria and infertility. Common side effects of the GnRH agonists and antagonists include symptoms of hypogonadism such as hot flashes, gynecomastia, fatigue, weight gain, fluid retention, erectile dysfunction and decreased libido.

Are GnRH antagonists the future of analog Dev elopment?

Consequently, GnRH antagonists offer substantial advantages in avoiding the initial ‘flare’ and rapid desensitization. The future of analog dev elopment now appears to be focused on producing more potent and safer antagonists. 9. GnRH antagonist overview

What are gonadotropin-releasing hormone antagonists?

Gonadotropin-releasing hormone antagonists are used to treat women undergoing fertility treatment. It prevents early release of luteinizing hormone (LH) and premature ovulation in women being administered follicle-stimulating hormone (FSH) when preparing for in-vitro fertilization.

What is the clinical application of GnRH analogs?

GnRH analogues have achieved widespread clinical use for the control of reproduction in animals. Over 2000 analogues of GnRH have been dev eloped and tested over the last 30 years. Paradoxical