The hypothalamic–pituitary–testicular (HPT) axis constitutes the fundamental neuroendocrine pathway regulating male reproductive physiology. This axis integrates hormonal signaling between the hypothalamus, anterior pituitary gland, and testes to maintain spermatogenesis and androgen production.
Gonadotropin-releasing hormone (GnRH) is secreted in a pulsatile manner from the hypothalamus, stimulating the pituitary to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). LH promotes testosterone synthesis by Leydig cells, while FSH stimulates Sertoli cells to support spermatogenesis.
Disruption of the HPT axis may arise from obesity, systemic illness, pituitary tumors, chronic stress, or endocrine disorders. Clinically, patients may present with infertility, decreased libido, erectile dysfunction, and fatigue.
Evaluation includes hormonal profiling, imaging when indicated, and correlation with semen analysis. Management targets the underlying cause and may involve hormonal replacement or gonadotropin therapy.
Understanding the HPT axis is essential for accurate diagnosis erotic and effective treatment in andrology.
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