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The uptake of ⁶⁵Zn and [1,2-³H]testosterone by minced tissue of human benign hypertrophic prostates and the subcellular distribution of radioactivity were examined. The nature of steroid and ⁶⁵Zn binding by the cytosol (105000 g supernatant) fraction was investigated by gel filtration, ion-exchange chromatography and electrophoresis.

It was found that steroid binding after incubation at 4°C was specific. One or two regions of steroid binding were observed after gel filtration of the cytosol using Sephadex G-200, depending upon incubation conditions. Binding of ⁶⁵Zn was found in the low molecular weight peak after G-200 gel filtration. Equimolar CdCl₂ and ⁶⁵ZnCl₂ were incubated with [1,2-³H]testosterone and minced tissue and the cytosol was subjected to gel filtration. Compared with control values, without CdCl₂, reduction of ⁶⁵Zn binding by about 50% occurred, while binding of ³H-labelled steroid was unaffected. Electrophoresis and ion-exchange chromatography showed that ⁶⁵Zn and ³H-labelled steroid were bound to different proteins. A sample of the zinc-binding protein was prepared by ion-exchange chromatography and the homogeneity was checked by electrophoresis.