Atriopeptin I rat, mouse is an atrial natriuretic peptide, which stimulates the testosterone production with half-maximum stimulation of 38 nM[1].
References
[1] Mukhopadhyay AK, et al., Testosterone production by mouse Leydig cells is stimulated in vitro by atrial natriuretic factor. FEBS Lett. 1986 Jun 23;202(1):111-6. DOI:10.1016/0014-5793(86)80659-7
