The effect of heat stress on the cellular behavior, intracellular signaling profile of porcine growth hormone (pGH) in swine testicular cells.

At present, heat stress caused by the thermal environment is the main factor that endangers the reproductive function of animals. Growth hormone (GH) is a polypeptide hormone, the biological function of reproductive organs has been reported, and it has many important physiological functions in the body. However, so far, the behavior and signal transduction of GH in testicular cells under heat stress are still unclear. To this end, in the current work, we use a swine testicular cell line (ST) as an in vitro model to explore the cell behavior and intracellular signaling profile of porcine growth hormone (pGH) under heat stress; the results showed that when cells were under heat stress, pGH and GHR were basically not internalized, and a large number of them accumulated on the cell membrane. In addition, we also studied the effect of pGH on the JAK2-STATs signaling pathway and IGF-1 expression under heat stress, we found that the ability of pGH to activate the JAK-STATs signaling pathway and IGF-1 under heat stress was greatly reduced (p < 0.05). In conclusion, our research shows that when cells undergo heat stress, the internalization of pGH and GHR were inhibited, and the activation of the JAK2-STATs signaling pathway and IGF-1 expression were reduced; this lays a solid foundation for further research on the effect of pGH on swine testicular tissue under thermal environment.