Abstract
Purpose
Urokinase plasminogen activator (uPA) and its inhibitor type 1 (PAI-1) are associated with tumour metabolism and are widely considered to be informative for the identification of cancer. We have analysed prostate tissue resections from patients with prostate cancer (PCa) and with benign prostatic hyperplasia (BPH) for protein levels of uPA and PAI-1, and searched for distinctions between these two clinical manifestations.
Methods
Prostate tissue was deep frozen in liquid N2 and homogenized in a stainless steel punch homogenizer. The tissue powder was extracted with a pH 8.5 TRIS/Triton X-100 buffer, and the extract analysed by FEMTELLE assay to generate uPA and PAI-1 readings in ng/mg protein. The uPA/PAI-1 ratio was calculated for each sample, and the mean ratios for the two diagnostic groups were compared.
Results
The concentration of uPA (mean ± SD) was found to be 0.19 ± 0.04 ng/mg protein (range 0.05–0.72 ng/mg) and 0.15 ± 0.02 ng/mg protein (range 0.03–0.78 ng/mg) in PCa and BPH samples, respectively. The concentration of PAI-1 was found to be 4.93 ± 0.90 ng/mg (range 1.10–11.80 ng/mg) and 5.87 ± 0.70 ng/mg (range 0.2–25.0 ng/mg) in PCa and BPH samples, respectively. A consistent finding being that PAI-1 concentrations exceed uPA concentrations by far giving rise to characteristic uPA/PAI-1 ratios. In BPH samples, there was a trend of PAI-1 to increase with uPA content, while in PCa samples, PAI-1 remained fairly constant. The mean uPA/PAI-1 ratio in PCa samples was found to be 0.06 ± 0.01 and was significantly higher than in BPH samples where the mean uPA/PAI-1 ratio was 0.03 ± 0.003 (p = 0.0028). R 2 = 0.1389.
Conclusion
Using a contingent of 62 patients of which 46 were BPH and 16 were PCa, we report definitive concentrations of uPA and PAI-1 in tumour tissue extracts and show that the uPA/PAI-1 ratio emerges as a candidate marker to distinguish between BPH and PCa.
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Acknowledgments
We thank Drs. K. du Toit, J. Basson, H. van Heerden, S. Wessels and C. van der Walt of the Urology Department for prostate resections and Dr. M. Vetter for advice on the utilization of the FEMTELLE assay. Financial support was received from the University of Stellenbosch Faculty of Medicine and Health Sciences, and the Cancer Association of South Africa (CANSA) to LB. Material and travel support from AMERICAN DIAGNOSTICA (Pfungstadt, Germany) is also gratefully acknowledged.
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Böhm, L., Serafin, A., Akudugu, J. et al. uPA/PAI-1 ratios distinguish benign prostatic hyperplasia and prostate cancer. J Cancer Res Clin Oncol 139, 1221–1228 (2013). https://doi.org/10.1007/s00432-013-1428-y
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DOI: https://doi.org/10.1007/s00432-013-1428-y