Placental form of membrane-bound neutral arylamidase found in renal cell carcinoma

A placental form of membrane-bound neutral arylamidase was found in the tissue of renal cell carcinoma. Membrane-bound neutral arylamidases from renal cell carcinoma, an intact part of the same kidney and placenta, had the same molecular weight (240 000) and were identical with respect to KM value and effect of inhibition by chelators or amino acids. Membrane-bound neutral arylamidase from renal carcinoma had the same electrophoretic mobility and heat stability as placental membrane-bound neutral arylamidase, but differed from kidney membrane-bound neutral arylamidase with respect to electrophoretic mobility, heat stability and susceptibility to urea inactivation. Results suggest the carcinoplacental alterations in membrane-bound neutral arylamidase isoenzyme in renal cell carcinoma.