Estrogen receptors and function in the male reproductive system Receptores e função do estrógeno no sistema reprodutor masculino

AbstrAct A substantial advance in our understanding on the estrogen signaling occurred in the last deca-de. Estrogens interact with two receptors, ESR1 and ESR2, also known as ERα and ERβ, respec-tively. ESR1 and ESR2 belong to the nuclear receptor family of transcription factors. In addition to the well established transcriptional effects, estrogens can mediate rapid signaling, triggered within seconds or minutes. These rapid effects can be mediated by ESRs or the G protein-cou-pled estrogen receptor GPER, also known as GPR30. The effects of estrogen on cell proliferation, differentiation and apoptosis are often mediated by growth factors. The understanding of the cross-talk between androgen, estrogen and growth factors signaling pathways is therefore es-sential to understand the physiopathological mechanisms of estrogen action. In this review we focused on recent discoveries about the nature of the estrogen receptors, and on the signaling and function of estrogen in the male reproductive system.