Summary
An immunoquantification protocol based on an enzyme-linked immunosorbent assay was developed to measure the abundance of the microsomal enzyme steroid sulphatase (STS). The two-step sandwich immunoassay is sufficiently sensitive to detect 100–200 pg purified steroid sulphatase in a 50-µl sample. The steroid sulphatase content in fibroblast, leukocyte and placental extracts correlates with the steroid sulphatase activity in these extracts. No steroid sulphatase protein was found in approximately 350 µg plasma proteins from a normal person. In three of four X-linked ichthyosis patients a complete gene deletion was found by Southern hybridization with the full-length STS cDNA as probe. Neither steroid sulphatase protein nor enzymatic activity was found in fibroblast extracts of these three patients. In a fibroblast extract of another X-linked ichthyosis patient, which had a normal Southern blotting pattern, no immunoreactive protein was detected. Residual activity of steroid sulphatase was also not found after prolonged incubation of this fibroblast extract with the natural substrate oestrone sulphate.
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Fan, X., Petruschka, L., Wulff, K. et al. Biochemical and immunological characterization of X-linked ichthyosis. J Inherit Metab Dis 16, 17–26 (1993). https://doi.org/10.1007/BF00711310
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DOI: https://doi.org/10.1007/BF00711310