Anti-FSH monoclonal antibody, clone A090-10243

Follicle-Stimulating Hormone (FSH) is a glycoprotein hormone secreted by the anterior pituitary gland, present in humans and other mammals, playing a crucial role in regulating reproductive system functions. FSH is involved in the development and function of the gonads and also regulates the levels of other hormones in the body. Together with Luteinizing Hormone (LH), FSH helps regulate gonadal function and maintain reproductive health. In females, FSH primarily regulates the development of ovarian follicles and ovulation, while in males, it participates in the process of spermatogenesis. The secretion of FSH is precisely regulated by the hypothalamic-pituitary-gonadal axis (H-P-G axis). The hypothalamus secretes gonadotropin-releasing hormone (GnRH), which acts on the anterior pituitary to stimulate the secretion of FSH and LH. FSH, as a glycoprotein hormone, consists of an alpha and a beta chain, with the beta chain responsible for specifically recognizing target cells. It shares the same alpha chain with LH and human chorionic gonadotropin (hCG). FSH secretion is regulated by a negative feedback mechanism, particularly influenced by estrogen and progesterone levels, which inhibit FSH secretion. In females, FSH secretion undergoes cyclical changes in close relation to the menstrual cycle, particularly during follicular development and ovulation. In males, FSH secretion is more stable and maintains the process of spermatogenesis.

In the female reproductive process, FSH plays a central role, especially in the regulation of follicle development and ovulation. During the follicular phase of the menstrual cycle, FSH levels rise, stimulating the development and maturation of primary follicles. Ovarian follicles depend on FSH for stimulation, particularly granulosa cells, which proliferate under the influence of FSH and produce estrogen. Estrogen further promotes the thickening of the endometrium, preparing for potential pregnancy. FSH also helps regulate the follicle selection process, leading to the formation of a dominant follicle. As the cycle progresses, multiple follicles compete for FSH resources, but only one follicle matures and ovulates. FSH regulates the sensitivity of granulosa cells to LH, ensuring normal follicular development and preventing the simultaneous development of multiple follicles. Additionally, FSH promotes estrogen secretion, forming a negative feedback loop that inhibits excess FSH secretion, ensuring the normal progression of the menstrual cycle and maintaining reproductive system balance. In the male reproductive system, FSH's role is focused on spermatogenesis. FSH primarily acts on Sertoli cells in the testes, binding to receptors on their surface, activating signaling pathways, and promoting the secretion of factors that support sperm production. These factors aid in the division and differentiation of spermatogonia into mature sperm. FSH also increases the production of androgen-binding proteins in the testes, raising local testosterone concentrations, creating an ideal physiological environment for spermatogenesis. Furthermore, FSH ensures sperm maturation and the survival of reproductive cells through growth factors secreted by Sertoli cells, maintaining normal male fertility. Hence, stable FSH secretion in males is crucial for sustaining fertility.

Figure 1. FSH's Influence on Folliculogenesis (Source: Recchia K, et al. 2021)

Clinically, FSH level testing and regulation have widespread applications, particularly in evaluating and treating reproductive health. For women, baseline FSH levels are commonly used to assess ovarian function and predict the causes of infertility. As women age, ovarian reserve decreases, and FSH levels typically rise; thus, high FSH levels often indicate ovarian decline or the onset of perimenopause. In assisted reproductive technology, FSH medications are widely used for ovulation induction, stimulating multiple follicle development in the ovaries, thereby increasing the chances of successful conception. In men, FSH level testing is also used to assess the causes of infertility, as abnormally elevated FSH levels often indicate impaired spermatogenesis or testicular dysfunction. In certain cases, exogenous FSH can also be used to treat male infertility by promoting sperm production and enhancing fertility. Abnormal FSH levels are often associated with various reproductive disorders. High FSH levels usually indicate gonadal failure in either the ovaries or testes, commonly seen in conditions such as premature ovarian failure in women or testicular dysfunction in men, such as in Klinefelter syndrome, where testicular underdevelopment leads to elevated FSH levels. Conversely, low FSH levels are commonly associated with hypothalamic or pituitary dysfunction, such as pituitary tumors or other conditions that reduce gonadotropin secretion. Women with low FSH levels may experience amenorrhea or ovarian insufficiency, while men may exhibit gonadal dysgenesis and insufficient sperm production. Therefore, FSH level testing and regulation play a crucial role in diagnosing and treating infertility and other reproductive disorders. With advances in medical technology, the clinical application of FSH is expected to expand further in the future.

Anti-Follicle Stimulating Hormone Antibody A090-10243
Monoclonal Anti-FSH Clone A090-10243
FSH Monoclonal Antibody (Clone A090-10243)
Anti-FSH mAb A090-10243