The invention relates to application of
ginsenoside Rg4 as a unique
active ingredient in preparation of a
medicine for improving male delayed
gonad hypofunction, belonging to the field of biological
medicine. According to the invention, the action mechanism of the Rg4 for improving LOH is defined for the first time: the Rg4 can specifically up-regulate the
mRNA expression quantity of StAR and StARD7 in a
testis tissue, and promote the transport of
cholesterol to the inner mitochondrial membrane of a testis
Leydig cell from the transcriptional level; the Rg4 improves the
mRNA expression quantity of P450scc, 3 beta-HSD in testicular tissues by promoting the efficient transport of
cholesterol, enhances the conversion of
cholesterol to
pregnenolone and the catalytic synthesis of subsequent steroids, and improves the endogenous
testosterone synthesis capability; the Rg4 can recover the
negative feedback regulation function of an HPG axis, regulate
secretion of pituitary LH and FSH to physiological
steady state, and avoid abnormal fluctuation of
hormone level. The invention fills the technical blank of Rg4 in the field of LOH
gene regulation and control.