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Mouse monoclonal antibodies against rat estramustine binding protein

A Pousette, P Björk, B Forsgren

    Journal of Steroid Biochemistry
    |April 1, 1987
    PubMed

    Hybridomas producing antibodies against rat prostatic estramustine binding protein (rEMBP) have been obtained by fusion of spleen lymphocytes from Balb/c mice, immunized with rEMBP, and SP2/0 Ag 14 mouse myeloma cells. Anti-rEMBP IgG producing cultures were identified in a solid phase ELISA using alkaline phosphatase conjugated sheep antimouse IgG. Cultures producing specific antibodies were subcloned and expanded. The produced immunoglobulins were characterized according to interaction with subunits of rEMBP. No interaction was found with [3H]estramustine-human estramustine binding protein. Following development of a radioimmunoassay, tissue distribution of rEMBP in the rat was studied. Despite high specificity, shown by selective interaction with rEMBP (F and S subunits), macromolecules interacting with anti-rEMBP were found in high concentrations in the prostrate and also in low concentrations, in other tissues of the male genital tract, and further in the adrenals, pancreas and submaxillary gland. The high specificity also makes it possible to study the F and S subunit selectively. These results show that macromolecules very similar to rEMBP are present in hormone-sensitive tissues in the rat.

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