This study also demonstrated that during human fetal development, the alternate pathway predominantly functions in peripheral nongonadal tissues including the placenta, liver and adrenal, indicating that tissues other than the testes contribute to masculinisation . Further, O’Shaughnessy et al. recently showed that androsterone, an alternate pathway androgen, was a major precursor found in human male fetuses, with significantly higher circulating concentration compared to females . It is now clear that masculinisation during human fetal development is dependent on both the canonical and alternate androgen biosynthesis pathways .
Supernatants were harvested 24 hours after stimulation, and IFN-γ and TNF levels were analyzed using ELISA (both R&D Systems) according to the manufacturer instructions. Surface antibodies were stained for 30 minutes at 4°C, followed by intracellular staining for 1 hour at room temperature using the eBioscience Foxp3/Transcription Factor Staining Buffer Set (Thermo Fisher Scientific). Gating strategies for identifying T cell subsets, including Th1, Th17, Treg, and other populations, are illustrated in Supplemental Figure 6, and the corresponding antibody information is detailed in Supplemental Table 6. For the analysis of intracellular cytokines, whole blood samples were stimulated with PMA (250 ng/mL) and ionomycin (5 μg/mL, both Sigma-Aldrich) in the presence of GolgiPlug (1 μg/mL, BD Biosciences) for 4 hours. Sex is a potentially important variable in this study and has been taken into account in the analysis of the human material, experimental work with animals, and their interpretation.
PLCs also have a spindle shape but express 3β-HSD and LHR have a strong ability to produce testosterone . In rats, the SLCs present a spindle shape do not express LH receptors and do not secrete testosterone . After birth, the FLCs gradually disappear by degeneration, rather than by apoptosis, and a portion of the FLCs persist in the testicles with ALCs, accounting for about 5% ~ 20%. Notably, although FLCs contain LH receptor (LHR), which responds to LH, unlike ALCs, their testosterone synthesis is gonadotropin-independent . Testosterone is produced in a manner similar to that of adults, which synthesize testosterone from cholesterol. After that, their numbers continue to increase, reaching a peak at birth, and then they gradually degenerate 23,24.
Androgens such as testosterone and dihydrotestosterone (DHT) are essential for male sexual development, masculinisation, and fertility. As the molecular mechanisms of testosterone signaling continue to be revealed, we will accumulate the intellectual resources required to produce therapies for specific male infertility conditions and targets for contraceptive development. Peptides that have already been identified to block AR-Src interactions55,56 and corresponding peptidomimetic molecules are being assessed for blocking the non-classical pathway and spermatogenesis (Walker WH, unpublished data). One potential target for contraceptive development could be the testosteroneinduced interaction of AR and Src kinase that initiates the nonclassical pathway. If the non-classical pathway is found to be required to maintain spermatogenesis, then it is expected that new targets for the regulation of spermatogenesis will be identified.
Testosterone treatment for reasons other than possible improvement of sexual dysfunction may not be recommended. Testosterone is used as a medication for the treatment of male hypogonadism, gender dysphoria, and certain types of breast cancer. As demonstrated by a meta-analysis, substitution therapy with testosterone results in a significant reduction of inflammatory markers. Conflicting results have been obtained concerning the importance of testosterone in maintaining cardiovascular health.
Testosterone is also synthesized in far smaller total quantities in women by the adrenal glands, thecal cells of the ovaries, and, during pregnancy, by the placenta. Like other steroid hormones, testosterone is derived from cholesterol (Figure 1). However, the concentrations of testosterone required for binding the receptor are far above even total circulating concentrations of testosterone in adult males (which range between 10 and 35 nM). The bones and the brain are two important tissues in humans where the primary effect of testosterone is by way of aromatization to estradiol. Greatly differing amounts of testosterone prenatally, at puberty, and throughout life account for a share of biological differences between males and females. Androgen receptors occur in many different vertebrate body system tissues, and both males and females respond similarly to similar levels. 5α-DHT binds to the same androgen receptor even more strongly than testosterone, so that its androgenic potency is about 5 times that of T.

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