“…As mentioned above, ACE2 has recently been demonstrated as a receptor in SARS-CoV-2 infection. On the one hand, as a pivotal role in the cardiovascular system by generating the vasoconstrictor peptide angiotensin II (Ang II), the metallopeptidase angiotensin-converting enzyme (ACE) is a constitutive product of adult-type leydig cells and the expression of ACE2 by leydig cells suggests a regulatory role for the enzyme in steroidogenesis via limiting testosterone inhibition by Ang II ( Batiha et al, 2020 ; Li et al, 2020; Muñoz et al, 2014, Reis et al, 2010, Verdecchia et al, 2020; Zou et al, 2020) . On the other hand, Reis’ study suggested that the testicular samples of infertile men with impaired spermatogenesis expressed ACE2 mRNA at lower concentrations than samples with full spermatogenesis ( Reis et al, 2010 ).…”