breast cyst/protease

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Proteases in cyst fluid from human gross cyst breast disease.

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Cyst fluid from women with gross cystic breast disease was found to contain protease activity when assayed against [14C]albumin. At least six different proteases were detected when the fluid was fractionated by a combination of S-300 Sephacel, hydroxylapatite, and DEAE-Sephacel chromatographic

Purification and properties of an esterase from human breast cyst fluid.

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Levels of estradiol 17 beta-ester hydrolytic activity in the breast cyst fluid (BCF) from 25 different women with fibrocystic disease of the breast were found to vary over a wide range (0-2.4 nmol/min/mg protein for estradiol acetate). On the basis of electrophoretic mobility on agarose gels, the

Prostate-specific antigen in breast cyst fluid: possible role of prostate-specific antigen in hormone-dependent breast cancer.

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Prostate-specific antigen (PSA) is a 33 kDa serine protease which is produced by many different tissues in the body and has been shown to be present in low concentrations in breast milk and in about 30% of breast cancers. The presence of PSA in breast cancers is associated with the presence of

Prostate specific antigen--a new constituent of breast cyst fluid.

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We demonstrate for the first time that prostate specific antigen (PSA) is a component of breast cyst fluid. At the cutoff level of 0.01 or 0.03 micrograms/L of PSA, 64% or 43% of cyst fluids are positive for PSA, respectively. PSA in cyst fluid, as characterized by high performance liquid

Human glandular kallikrein in breast milk, amniotic fluid, and breast cyst fluid.

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BACKGROUND Human glandular kallikrein (hK2) belongs to the serine protease family of enzymes and has high sequence homology with prostate-specific antigen (PSA). The physiological role of hK2 has not as yet been determined, but there is evidence that it can regulate the proteolytic activity of PSA

Cyst fluid proteases.

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The precise origin of breast cyst fluid remains obscure. Molina has presented evidence that type II cysts (high Na/K ratio) may be transudative, that is, partly derived from plasma elements which enter through gap junctions, while Type I cysts (high K/Na ratio) are primarily secretory. In

Quantification of prostate-specific antigen immunoreactivity in human breast cyst fluids.

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The frequency of gross cystic breast disease in premenopausal women and its possible association with increased breast cancer risk emphasises the importance of investigations relating to breast cyst fluid composition. In order to contribute to a better analysis of this medium, we have measured the

Alpha 1-antichymotrypsin complexes in human breast cyst fluids.

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Alpha 1-antichymotrypsin, a serum protease inhibitor, was found in 72 breast cyst fluids aspirated from women affected by gross cystic breast disease. When fractionated by gel chromatography, the presence of protein complexes or aggregates was demonstrated. A different distribution of the alpha

Prostate-specific antigen found in type I breast cyst fluids is a secretory product of the apocrine cells lining breast gross cysts.

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Prostate-specific antigen (PSA), a serine protease thought to be exclusively produced by the prostate epithelial cells, has been recently found in human breast tissues and fluids. PSA in breast cancer is associated with the presence of steroid-hormones and receptors, and its presence seems to be a

Breast cyst fluid plasmin activity and its effect on TGF-beta2 activation.

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There are two types of breast cyst and women with apocrine breast cyst may have a higher risk of developing breast cancer than cyst lined by flattened epithelium. Transforming growth factor-beta's growth inhibitory effect on epithelial cells suggests a potential protective role in breast cancer. The

Immunofluorometric assay of human kallikrein 6 (zyme/protease M/neurosin) and preliminary clinical applications.

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BACKGROUND The human kallikrein gene family has contributed the best prostatic biomarkers currently available, including prostate-specific antigen (PSA) and human glandular kallikrein 2 (hK2). Recently, new members of the human kallikrein gene family have been identified. One new member is the KLK6

Prostate specific antigen in the female body: its role in breast cancer prognosis.

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Prostate-specific antigen, a 33 kDa serine protease, is found at high concentrations in seminal plasma and prostate epithelial cells. It is currently used for the diagnosis and monitoring of prostate carcinoma. However, several investigators have demonstrated nonprostatic sources of prostate

Differential distribution of soluble and complexed forms of prostate-specific antigen in cyst fluids of women with gross cystic breast disease.

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Gross cystic breast disease (GCBD) is the most common benign disease of the human female breast, and patients with GCBD have an increased risk of breast cancer. The aim of this study was to evaluate the distribution inside apocrine cells and in breast cyst fluids aspirated from gross cysts of

Distribution of 15 human kallikreins in tissues and biological fluids.

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BACKGROUND Kallikreins (KLKs) are a group of 15 secreted serine proteases. Some KLKs are established or candidate cancer biomarkers, but for most the physiological function is unknown. We characterized the protein and mRNA abundance patterns of all 15 KLKs in multiple panels of human tissues and

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