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A prospective study of plasma total cysteine and risk of breast cancer.

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Cysteine is the precursor of glutathione, a powerful intracellular antioxidant and an important detoxifying agent of carcinogens. However, data relating plasma total cysteine to breast cancer risk are sparse. We conducted a prospective nested case-control study among 32826 women in the Nurses'

Differences in cysteine peptidases-like activity in sera of patients with breast cancer.

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The key role in carcinogenesis with destruction of the extracellular matrix is played by proteases released by invasive cancer cells. Cysteine peptidases, such as cathepsin B and L, take an important role in cancer progression and metastasis.Cysteine

Prognostic value of the cysteine proteases cathepsins B and cathepsin L in human breast cancer.

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The lysosomal cysteine proteases cathepsin B and cathepsin L have been implicated in tumor spread and metastasis. To evaluate the prognostic impact of these proteases for disease-free survival and overall survival in breast cancer, the antigen content of cathepsin B and cathepsin L was determined

Characterization of cysteine proteases and their endogenous inhibitors in MCF-7 and adriamycin-resistant MCF-7 human breast cancer cells.

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The expression of three lysosomal cysteine proteases was examined in a lowly metastatic, MCF-7 human breast cancer cell line and its highly metastatic, Adriamycin-resistant variant, MCF-7/AdrR. While levels of cathepsin H activity were similar in all cell lines at each stage of growth, intracellular

Effects of N-acetyl-L-cysteine on adhesive strength between breast cancer cell and extracellular matrix proteins after ionizing radiation.

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OBJECTIVE To evaluate the effect of N-acetyl-L-cysteine (LNAC), a common ROS scavenger, on the adhesive affinity between MDA-MB-231 breast cancer cells and extracellular matrix (ECM) proteins after IR. METHODS Using static cell adhesion assays to determine the effect of various times and duration of

SNPs near the cysteine proteinase cathepsin O gene (CTSO) determine tamoxifen sensitivity in ERα-positive breast cancer through regulation of BRCA1.

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Tamoxifen is one of the most commonly employed endocrine therapies for patients with estrogen receptor α (ERα)-positive breast cancer. Unfortunately the clinical benefit is limited due to intrinsic and acquired drug resistance. We previously reported a genome-wide association study that identified

Demonstration of cysteine proteinase inhibitors ACPI and NCPI in breast cancer and in cell lines MCF-7 and ZR-75-1.

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The samples of breast cancer and cell lines MCF-7 and ZR-75-1 were tested for the occurrence of cysteine proteinase inhibitors ACPI and NCPI. Further, the influence of estradiol on the expression of these inhibitors was examined. Both the tested inhibitors were found in tumor cells and in cell

Prognostic Significance of Promoter DNA Hypermethylation of cysteine dioxygenase 1 (CDO1) Gene in Primary Breast Cancer.

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Using pharmacological unmasking microarray, we identified promoter DNA methylation of cysteine dioxygenase 1 (CDO1) gene in human cancer. In this study, we assessed the clinicopathological significance of CDO1 methylation in primary breast cancer (BC) with no prior chemotherapy. The CDO1 DNA

[Interaction of body mass index and a polymorphism in gene of catalytic subunit of glutamate-cysteine ligase on breast cancer risk among Chinese women].

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OBJECTIVE To investigate the interaction of body mass index(BMI)and a single nucleotide polymorphism (SNP, rs17883901) in catalytic subunit of glutamate-cysteine ligase (GCLC) on breast cancer risk. METHODS A total of 839 women with incident breast cancer and 863 age-matched controls without cancer

Primary tumour expression of the cysteine cathepsin inhibitor Stefin A inhibits distant metastasis in breast cancer.

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Using the clinically relevant 4T1-derived syngeneic murine model of spontaneous mammary metastasis to bone, we have identified the cysteine cathepsin inhibitor Stefin A as a gene differentially expressed in primary and metastatic mammary tumours. In primary tumours, Stefin A expression correlated

Expression of secreted protein acidic and rich in cysteine (SPARC) in breast cancer and response to neoadjuvant chemotherapy.

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Secreted protein acidic and rich in cysteine (SPARC) has been suggested as a new biomarker and therapeutic target in breast cancer, as well as other tumor types.We evaluated the frequency of SPARC expression among different molecular breast cancer subtypes

Cysteine-linked dimerization of BST-2 confers anoikis resistance to breast cancer cells by negating proapoptotic activities to promote tumor cell survival and growth.

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Almost all breast tumors express the antiviral protein BST-2 with 67%, 25% and 8.2% containing high, medium or low levels of BST-2, respectively. Breast tumor cells and tissues that contain elevated levels of BST-2 are highly aggressive. Suppression of BST-2 expression reprograms tumorigenic

Cysteine proteinase inhibitor cystatin A in breast cancer.

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Cystatin A (acid cysteine proteinase inhibitor; ACPI) is a natural inhibitor of cysteine proteinases. It has been suggested that an inverse correlation exists between cystatin A and malignant progression. We wanted to assess the biological and clinical significance of cystatin A in infiltrative

A cysteine proteinase secreted from human breast tumours is immunologically related to cathepsin B.

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The stable cathepsin B-like cysteine (thiol) proteinase secreted from human breast tumours in culture was shown to be destabilized by mercurial compounds. After such treatment the enzyme cross-reacts in a radioimmunoassay with a monospecific antiserum to human liver cathepsin B. It is suggested that

Inhibition of cathepsin B activity in human breast cancer tissue by cysteine peptidase inhibitor isolated from human placenta: immunohistochemical and biochemical studies.

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Cysteine peptidases and their endogenous inhibitors (CPI) have been shown to be involved in tumor progression and metastasis. Since their activity has been found to be changed in tumor tissue and/or body fluids of cancer patients, the determination of the peptidase/inhibitor levels is considered as

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