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prostatic neoplasms/protease
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A complex between prostate-specific antigen and alpha 1-antichymotrypsin is the major form of prostate-specific antigen in serum of patients with prostatic cancer: assay of the complex improves clinical sensitivity for cancer.
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We have studied the forms of prostate-specific antigen (PSA) in serum of patients with prostatic cancer and benign prostatic hyperplasia. Fractionation of serum by gel filtration and assay of the fractions for PSA showed that a considerable part of the PSA immunoreactivity in serum consisted of
Reverse biochemistry: use of macromolecular protease inhibitors to dissect complex biological processes and identify a membrane-type serine protease in epithelial cancer and normal tissue.
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Serine proteases of the chymotrypsin fold are of great interest because they provide detailed understanding of their enzymatic properties and their proposed role in a number of physiological and pathological processes. We have been developing the macromolecular inhibitor ecotin to be a
Cathepsins B, H, L and cysteine protease inhibitors in malignant prostate cell lines, primary cultured prostatic cells and prostatic tissue.
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Elevated activities of cysteine proteinases, the cathepsins B, H, L (CB, CH, CL) and diminished cysteine protease inhibitors (CPI) have been demonstrated in a variety of tumours and have been suggested to contribute to invasion and metastasis. The situation for prostate cancer is still unknown. In
Percentage of free serum prostate-specific antigen: a new tool in the early diagnosis of prostatic cancer.
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Prostate-specific antigen (PSA) is a protease able to bind to serum antiproteases as alpha 1 antichymotrypsin (ACT). Free PSA (FPSA) corresponds to the fraction of total PSA (TPSA) which is unbound to ACT. Specific detection of the FPSA seems to be a valuable tool in the distinction between
Effect of low glutamine/glucose on hypoxia-induced elevation of hypoxia-inducible factor-1alpha in human pancreatic cancer MiaPaCa-2 and human prostatic cancer DU-145 cells.
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OBJECTIVE
Tumor microenvironment is characterized by regions of fluctuating and chronic hypoxia, low extracellular pH, and nutrient depletion. Although it is well known that hypoxia stimulates the accumulation of hypoxia-inducible factor-1alpha (HIF-1alpha), the role of low extracellular pH and
Analysis of prostatic fluid: evidence for the presence of a prospective marker for prostatic cancer.
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In an endeavor to identify marker(s) for prostatic cancer, proteins in prostatic fluids were analyzed by two-dimensional (2-D) gel electrophoresis. The fluids were obtained from five males who had no prostate lesions and five patients each with benign prostatic hyperplasia (BPH) and prostatic
Biochemical methods for predicting metastatic ability of prostatic cancer utilizing the dunning R-3327 rat prostatic adenocarcinoma system as a model.
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At present, there is no established diagnostic method by which the metastatic ability of an individual prostatic cancer can be accurately predicted. Metastasis is a multistep process, the first critical step of which is invasion. Tumor invasion has been suggested to involve a variety of hydrolytic
The partial purification and characterization of GnRH-like activity from prostatic biopsy specimens and prostatic cancer cell lines.
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We have investigated the possibility of the secretion of gonadotrophin-releasing-hormone (GnRH)-like peptides by prostatic cancer cells in culture and their presence in cytosolic preparations from human prostatic biopsy specimens. A GnRH-specific radioimmunoassay showed GnRH-like activity in
Steam heat with an EDTA buffer and protease digestion optimizes immunohistochemical expression of basal cell-specific antikeratin 34betaE12 to discriminate cancer in prostatic epithelium.
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In select cases of prostatic carcinoma, antikeratin 34betaE12 immunohistochemical analysis is diagnostically useful for specific labeling of basal cells. This antibody, however, is prone to variability in staining, and the optimal conditions were not, to our knowledge, previously defined. We
High resolution two-dimensional electrophoretic analysis of urinary proteins of patients with prostatic cancer.
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In an attempt to identify marker(s) for prostatic cancer, proteins in urines of normal and prostatectomized males and in men with cancerous prostate were analyzed. Only urines collected with protease inhibitors were examined. Two-dimensional (2-D) gel electrophoresis was used for high resolution
Autocrine regulation of prostate-specific antigen gene expression in a human prostatic cancer (LNCaP) subline.
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Prostate-specific antigen (PSA), a M(r) 34,000 serine protease, is recognized as a useful marker for the detection and prognosis of patients with prostate cancer. Although serum PSA is an excellent prognostic indicator, an increasing number of factors were found to regulate the PSA expression of
Inhibitors of tyrosine kinase inhibit the production of urokinase plasminogen activator in human prostatic cancer cells.
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Urokinase-type plasminogen activator (uPA) seems to be an important protease in prostate cancer invasion, and tyrosine phosphorylation is thought to play a role in the regulation of its production. The amount of uPA was measured with a synthetic peptide substrate after treatment with various
Role of cathepsin D in prostatic cancer cell growth and its regulation by brefeldin A.
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We investigated a possible relationship between brefeldin A (BFA), an antibiotic, and cathepsin D (Cat.D), a lysosomal protease, in prostate cancer proliferation. Effects of BFA (30 ng/ml) were examined on the growth of three human prostatic cancer cell lines, PC-3, DU-145, and LNCaP cells. Its
Serum alpha-thiol protease inhibitor concentrations in health and disease.
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Serum alpha-thiol protease inhibitor (alpha-TPI) concentration was assayed by radial immunodiffusion in normal subjects, pregnant women, and in a wide variety of diseases. The normal concentration (448 (SD 75) mg/l) increased significantly (p less than 0.001) in pregnancy to 575 (89) mg/l, and in
Bowman-Birk soybean protease inhibitor as an anticarcinogen.
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Vegetarian populations show a decreased occurrence of breast, colon, and prostatic cancers. Epidemiological studies have identified seeds (maize, corn, and beans) as protective agents in these cancers. We have selected to study one abundant component of all seeds, protease inhibitors. Synthetic and
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