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The aims of the present study were to characterise an assay for cAMP-binding proteins in ovarian cancer and then to measure levels in a series of tumours with a view to developing a potential prognostic indicator for this disease. Levels and types of binding proteins have been measured in cytosols from 50 ovarian tumours. Binding proteins were detected in all tumours but, as calculated from Scatchard analysis, binding levels ranged from 267 to 12,037 fmol per mg of cytosol protein (mean value of 4248 fmol mg-1). Dissociation constants of binding varied between 0.4 x 10(-8) and 5.9 x 10(-8) (mean value 2.3 x 10(-8)). Types of binding protein were detected by incubation with the photoaffinity ligand 8-N3-[32P]cAMP, followed by polyacrylamide gel electrophoresis and autoradiography. Labelled proteins with molecular weights of 52, 48, 43, 39 and 37 kDa were identified in the cytosols. The proportion and pattern of bands detected varied between different cytosols. The significance of these findings awaits clinical follow-up of the patients.

Cyclic adenosine 3',5'-monophosphate-binding proteins in human ovarian cancers