Pregnanediol

Pregnanediol (CAS No.: 80-92-2) is an endogenous steroid metabolite derived from progesterone via reductive metabolism and is predominantly excreted in urine, where it serves as a well-established biomarker for assessing progesterone levels and luteal function in endocrine research. As an inactive downstream product of progesterone catabolism, pregnanediol is widely utilized in studies investigating reproductive physiology, ovarian function, and hormonal regulation, particularly in the context of ovulation and pregnancy monitoring in experimental models. Mechanistically, pregnanediol has been reported to modulate phase II metabolism by inhibiting the glucuronidation activity of specific UGT1A1 variants, such as G71R, while not significantly altering the transcriptional activity of UGT1A1 enhancer-promoter complexes, highlighting its relevance in studies of metabolic enzyme regulation and genetic polymorphism effects. Its accumulation and detection in biological fluids make it a valuable analytical target in biomarker discovery and validation workflows. In vitro investigations typically explore its biochemical and enzymatic interactions at concentrations ranging from nanomolar to micromolar levels, depending on assay design, while in vivo and ex vivo studies employ tailored sampling strategies to correlate metabolite levels with endocrine states. Pregnanediol is therefore broadly applied in biochemical assays, metabolic profiling, and pharmacological research focused on steroid metabolism and conjugation pathways.