oxygenase/breast neoplasms

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Cyclo-oxygenase inhibition reduces tumour growth and metastasis in an orthotopic model of breast cancer.

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The effect of selective and non-selective cyclo-oxygenase inhibition on tumour growth and metastasis in an orthotopic model of breast cancer was investigated. 4T1 mammary adenocarcinoma cells were injected into the mammary fat pad of female BALB/c mice. When tumours reached a mean tumour diameter of

Plasmatic hypercoagulation in patients with breast cancer: role of heme oxygenase-1.

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Breast cancer is an important health threat to women worldwide, and is associated with a 9-14% incidence of thrombophilia. Of interest, patients with breast cancer have been noted to have an increase in endogenous carbon monoxide production via upregulation of heme oxygenase-1 activity. Given that

Overexpression of cyclo-oxygenase-2 is an independent predictor of unfavourable outcome in node-negative breast cancer, but is not associated with protein kinase B (Akt) and mitogen-activated protein kinase (ERK1/2, p38) activation or with Her-2/neu signalling pathways.

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OBJECTIVE The production of prostaglandins is regulated by cyclo-oxygenases (COXs), which also have a role in tumour development and progression in various malignancies, including breast cancer. The mechanisms by which COX-2 contributes to unfavourable prognosis are still poorly understood. The

15-Deoxy-Delta12,14-prostaglandin J2 upregulates the expression of heme oxygenase-1 and subsequently matrix metalloproteinase-1 in human breast cancer cells: possible roles of iron and ROS.

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Heme oxygenase-1 (HO-1) has recently been found to be involved in angiogenesis and metastasis. In this study, we investigated whether HO-1 could potentiate the metastatic potential of human breast cancer cells. Treatment of MCF-7 and MDA-MB-231 cells with 30 microM of

Cyclo-oxygenase-2 (COX-2) mRNA expression correlates with progesterone receptor positivity in human breast cancer.

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BACKGROUND We previously presented evidence showing that cyclo-oxygenase 2 (COX-2) plays an important role in mammary carcinogenesis and angiogenesis in human breast cancer. The present study aims to compare COX-2 mRNA expression with hormone receptor status, S-phase fraction, telomerase activity,

Can cyclo-oxygenase-2 be a useful prognostic and risk stratification marker in breast cancer?

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Cyclo-oxygenase-2 (COX-2) is a prostaglandin synthease that catalyses the synthesis of prostaglandin G2 (PGG2) and PGH2 from arachidonic acid. COX-2 plays an important role in tumourigenesis of different carcinoma types and it is thought to take part in breast carcinoma. In this study, the aim was

15d-PGJ2 inhibits NF-κB and AP-1-mediated MMP-9 expression and invasion of breast cancer cell by means of a heme oxygenase-1-dependent mechanism.

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Activation of peroxisome proliferator-activated receptor γ (PPARγ) serves as a key factor in the proliferation and invasion of breast cancer cells and is a potential therapeutic target for breast cancer. However, the mechanisms underlying this effect remain largely unknown. Heme oxygenase-1 (HO-1)

Heme oxygenase-1 determines the differential response of breast cancer and normal cells to piperlongumine.

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Piperlongumine, a natural alkaloid isolated from the long pepper, selectively increases reactive oxygen species production and apoptotic cell death in cancer cells but not in normal cells. However, the molecular mechanism underlying piperlongumine-induced selective killing of cancer cells remains

Roles of JNK/Nrf2 Pathway on Hemin-Induced Heme Oxygenase-1 Activation in MCF-7 Human Breast Cancer Cells

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Heme oxygenase-1 (HO-1) is highly induced in various human disease states, including cancer, indicating that HO-1 is an emerging target of cancer therapy. In this study, we investigated that the mechanisms of hemin-induced HO-1 expression and its signaling pathways in human breast cancer cell. We

Cyclo-oxygenase 2 modulates chemoresistance in breast cancer cells involving NF-kappaB.

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BACKGROUND Breast cancer cells can develop chemoresistance after prolonged exposure to cytotoxic drugs due to expression of the multi drug resistance (MDR) 1 gene. Type 2 cyclo-oxygenase (COX-2) inhibitors reverse the chemoresistance phenotype of a medullary thyroid carcinoma cell line, TT, and of a

The induction of heme oxygenase-1 suppresses heat shock protein 90 and the proliferation of human breast cancer cells through its byproduct carbon monoxide.

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Heme oxygenase (HO)-1 is an oxidative stress-response enzyme which catalyzes the degradation of heme into bilirubin, ferric ion, and carbon monoxide (CO). Induction of HO-1 was reported to have antitumor activity; the inhibitory mechanism, however, is still unclear. In the present study, we found

Role of heme oxygenase-1 and its reaction product, carbon monoxide, in manifestation of breast cancer stem cell-like properties: Notch-1 as a putative target.

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Cancer stem cells (CSCs) constitute a subpopulation of transformed cells that possess intrinsic ability to undergo selfrenewal and differentiation, which drive tumour resistance and cancer recurrence. It has been reported that CSCs possess enhanced protection against oxidative stress induced by

15-deoxy-Δ12,14-prostaglandin J₂ induces p53 expression through Nrf2-mediated upregulation of heme oxygenase-1 in human breast cancer cells.

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Heme oxygenase-1 (HO-1) is a stress-responsive enzyme that has antioxidant and cytoprotective functions. However, HO-1 has oncogenic functions in cancerous or transformed cells. In the present work, we investigated the effects of HO-1 on the expression of p53 induced by

Mechanisms underlying the growth inhibitory effects of the cyclo-oxygenase-2 inhibitor celecoxib in human breast cancer cells.

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BACKGROUND Inhibitors of cyclo-oxygenase (COX)-2 are being extensively studied as anticancer agents. In the present study we evaluated the mechanisms by which a highly selective COX-2 inhibitor, celecoxib, affects tumor growth of two differentially invasive human breast cancer cell

Heme Oxygenase-1 and breast cancer resistance protein protect against heme-induced toxicity.

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Heme is the functional group of diverse hemoproteins and crucial for many cellular processes. However, heme is increasingly recognized as a culprit for a wide variety of pathologies, including sepsis, malaria, and kidney failure. Excess of free heme can be detrimental to tissues by mediating

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