GH and GnRH-gonadotropin secretion.

The hypothalamic pituitary gonadal (HPG) and hypothalamic pituitary somatotropic (HPS) axes are interconnected, orchestrating growth, metabolism, and reproduction through reciprocal feedback. Growth hormone (GH) and insulin like growth factor 1 (IGF-1) stimulate gonadotropin releasing hormone (GnRH) and kisspeptin neurons, support luteinizing hormone release, and regulate gonadal steroidogenesis and gametogenesis. Conversely, sex steroids, particularly estradiol, potentiate GH secretion by sensitizing somatotrophs to growth hormone releasing hormone and enhancing ghrelin driven pathways. This crosstalk evolves across developmental stages, most prominently during puberty, when the synergistic rise of sex steroids, GH, and IGF-1 creates an anabolic environment driving linear growth, skeletal maturation, and reproductive competence. From a translational perspective, this interplay has important diagnostic and therapeutic implications. In short stature with delayed diagnosis, combined GH and GnRH analogue therapy may extend growth potential and improve adult height. In central or peripheral precocious puberty, particularly when growth velocity declines during GnRH analogue treatment, co-treatment can prevent growth deceleration and optimize stature. In reproductive medicine, GH has been explored as an adjuvant in assisted reproductive technologies, with evidence suggesting benefits in follicular recruitment, oocyte quality, embryo development, and endometrial receptivity, although consistent effects on live birth rates remain uncertain. Emerging strategies, including kisspeptin analogues, highlight opportunities to modulate reproductive and somatotropic axes simultaneously, offering potential interventions in hypogonadism and functional hypothalamic disorders. By integrating mechanistic insights with clinical application, the coordinated regulation of GnRH and GH illustrates how translational neuroendocrinology can bridge molecular discovery with diagnostic innovation and therapeutic progress in growth and reproductive health.