{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n 3β‐hydroxysteroid dehydrogenase type 2 (HSD3B2) is a key, rate‐limiting steroidogenic enzyme that catalyzes the conversion of Δ5‐steroids (eg, pregnenolone, dehydroepiandrosterone) to their Δ4‐forms (eg, progesterone, androstenedione), which is an essential early step in the biosynthesis of all classes of steroid hormones. This enzymatic reaction is fundamental for the production of mineralocorticoids and glucocorticoids in the adrenal cortex—as HSD3B2 is highly expressed in the zona glomerulosa and fasciculata—and for the synthesis of sex steroids in the gonads."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In ovarian physiology, HSD3B2 expression increases in the corpus luteum after ovulation, shifting the steroidogenic balance toward progesterone production. Transcriptional regulation by nuclear receptors such as liver receptor homolog‐1 (LRH-1) has been shown to be critical for stimulating HSD3B2 promoter activity during luteal cell differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition to its essential biosynthetic role, HSD3B2 expression is subject to complex regulation by multiple transcription factors—including members of the Nur77 and GATA families—in steroidogenic cells, underscoring its importance in maintaining proper adrenal zonation and the coordinated synthesis of steroids."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Moreover, comparative studies in adrenal carcinoma cell lines have demonstrated that differential HSD3B2 expression contributes to distinct steroid profiles, with lower levels favoring an androgenic milieu while higher expression supports glucocorticoid and mineralocorticoid production."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the gonads, regulators such as NR4A1 not only stimulate genes involved in early steroid steps but also enhance HSD3B2 expression, thereby promoting androgen production in the ovarian theca cells."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Conversely, clinical studies reveal that subtle mutations and polymorphisms in the HSD3B2 gene can diminish enzyme activity, which has been associated with a range of reproductive and developmental disorders including hypospadias and hyperandrogenic phenotypes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Furthermore, altered levels of HSD3B2, as observed in certain aldosterone-producing adenomas or prostate cancer contexts, may influence local steroidogenic output and thereby contribute to disease pathogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, this body of work emphasizes that HSD3B2 is central to steroid hormone biosynthesis. Its tightly regulated expression via various nuclear receptors and transcription factors ensures proper endocrine function, while genetic or regulatory disruptions can lead to clinically significant alterations in steroid profiles and contribute to disease development.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Mary H Bassett, Takashi Suzuki, Hironobu Sasano, et al. 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