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The 17β-hydroxysteroid dehydrogenase enzymes modify the availability of potent sex steroids and have thus attracted interest in the study of several steroid-dependent pathologies including breast, endometrial and prostate cancers. An increased awareness of the importance of steroidogenic enzymes has brought forth a demand for efficient assays to study the effects of individual enzymes on steroid levels. Methods used for assessing steroid conversion are often laborious and frequently involve hazardous sample preparation steps. We developed and validated an optimised simple method for sample preparation of sex steroids using protein precipitation by the addition of zinc sulphate/sodium hydroxide. The interconversion of radio-labelled oestrogens and androgens was quantified using high-performance liquid chromatography separation of oestrone, oestradiol, androstenedione and testosterone followed by online radiometric flow scintillation analysis. The method, which can be applied for assessing, e.g., the efficacy of inhibitors of steroidogenic enzymes, was successfully used for evaluating oestrogenic interconversion in breast cancer cell lines MCF7 and T-47D.

A validated and rapid high-performance liquid chromatography method for the quantification of conversion of radio-labelled sex steroids