Prostatic inhibin-like peptide quantified in urine of prostatic cancer patients by enzyme-linked immunosorbent assay.
This is a highly specific enzyme-linked immunosorbent assay (ELISA) for measuring prostatic inhibin-like peptide (PIP) in urine, in which we use penicillinase (EC 3.5.2.6) conjugated with PIP and, as solid phase, a polystyrene microtiter plate. We used this ELISA to measure PIP in 24-h urine specimens from men with prostatic cancer (PCa) and from age-matched controls. For prostatic cancer patients the mean +/- SEM urinary PIP of 36.1 +/- 5 micrograms/24 h was significantly (P less than 0.001) lower than the mean of 127.1 +/- 9 micrograms/24 h for the age-matched controls. PIP values for 30 samples measured by both ELISA and RIA correlated well (r = 0.985). We could detect as little as 1.56 ng of PIP in a sample. Analytical recovery of added PIP ranged from 91% to 104%. Mean CVs were 8.9% within-assay and 12.7% between-assay. We believe that this ELISA will be useful in assessing the status of PIP in men with normal and diseased prostates and in examining the function of the hypothalamus-pituitary-prostate axis.
Cancer Research Institute, Parel, Bombay, India.
T R
TR
Teni
A H
AH
Bandivdekar
A R
AR
Sheth
N A
NA
Sheth
D000368:Aged; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008297:Male; D008875:Middle Aged; D010455:Peptides / Q000592:standards / Q000652:urine*; D011471:Prostatic Neoplasms / Q000652:urine*; D029584:Prostatic Secretory Proteins; D011863:Radioimmunoassay; D015203:Reproducibility of Results
D010455:Peptides; D029584:Prostatic Secretory Proteins; C043076:beta-microseminoprotein