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phospholipase d/cancer du sein
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Inhibition of phorbol ester-stimulated phospholipase D activity by chronic tamoxifen treatment in breast cancer cells.
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We have shown that in an estrogen receptor-negative multidrug-resistant subline of MCF-7 human breast carcinoma cells longer-term (24 h), but not shorter-term (30 min), treatments with clinically relevant (2-5 microM) concentrations of tamoxifen (TAM) inhibited phorbol ester-stimulated phospholipase
Survival signals generated by estrogen and phospholipase D in MCF-7 breast cancer cells are dependent on Myc.
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Estrogens, which have been strongly implicated in the development of breast cancer, enhance proliferation of mammary epithelial cells and, importantly, estrogen receptor (ER)-positive breast cancer cells. In the absence of serum growth factors, the ER-positive MCF-7 breast cancer cell line undergoes
Selective estrogen receptor (ER) modulators differentially regulate phospholipase D catalytic activity in ER-negative breast cancer cells.
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Recent successes in the pharmacotherapeutic treatment of breast cancer are associated with the use of selective estrogen receptor modulators. Two commonly prescribed pharmaceuticals in this class, tamoxifen and raloxifene, have been shown to have effects through estrogen receptor (ER)-independent
Phospholipase D prevents apoptosis in v-Src-transformed rat fibroblasts and MDA-MB-231 breast cancer cells.
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Phospholipase D (PLD) activity is elevated in response to mitogenic and oncogenic signals. PLD also cooperates with overexpressed tyrosine kinases to transform rat fibroblasts. 3Y1 rat fibroblasts overexpressing the tyrosine kinase c-Src undergo apoptosis in response to serum withdrawal. We report
Phospholipase D inhibitor enhances radiosensitivity of breast cancer cells.
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Radiation and drug resistance remain the major challenges and causes of mortality in the treatment of locally advanced, recurrent and metastatic breast cancer. Dysregulation of phospholipase D (PLD) has been found in several human cancers and is associated with resistance to anticancer drugs. In the
Role of phospholipase D in migration and invasion induced by linoleic acid in breast cancer cells.
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Linoleic acid (LA) is an essential and omega-6 polyunsaturated fatty acid that mediates a variety of biological processes, including migration and invasion in breast cancer cells. Phospholipase D (PLD) catalyses the hydrolysis of phosphatidylcholine to produce phosphatidic acid and choline.
Triptolide-induced suppression of phospholipase D expression inhibits proliferation of MDA-MB-231 breast cancer cells.
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In spite of the importance of phospholipase D (PLD) in cell proliferation and tumorigenesis, little is known about the molecules regulating PLD expression. Thus, identification of small molecules inhibiting PLD expression would be an important advance for PLD- mediated physiology. We examined one
Increased phospholipase D activity in human breast cancer.
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Phospholipase D is believed to play an important role in cell proliferation and tumorigenesis. One of its major functions is to cause a sustained activation of protein kinase C through the primary production of phosphatidic acid from phosphatidylcholine by the enzyme, followed by dephosphorylation
Myc stabilization in response to estrogen and phospholipase D in MCF-7 breast cancer cells.
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Estrogen, which has been strongly implicated in breast cancer, suppresses apoptosis in estrogen receptor (ER) positive MCF-7 breast cancer cells. Phospholipase D (PLD), which is commonly elevated in ER negative breast cancer cells, also suppresses apoptosis. Survival signals generated by both
A new signaling pathway (JAK-Fes-phospholipase D) that is enhanced in highly proliferative breast cancer cells.
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The products of the oncogene Fes and JAK3 are tyrosine kinases, whose expressions are elevated in tumor growth, angiogenesis, and metastasis. Phosphatidic acid, as synthesized by phospholipase D (PLD), enhances cancer cell survival. We report a new signaling pathway that integrates the two kinases
Phospholipase D (PLD) drives cell invasion, tumor growth and metastasis in a human breast cancer xenograph model.
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Breast cancer is one of the most common malignancies in human females in the world. One protein that has elevated enzymatic lipase activity in breast cancers in vitro is phospholipase D (PLD), which is also involved in cell migration. We demonstrate that the PLD2 isoform, which was analyzed directly
Phospholipase D confers rapamycin resistance in human breast cancer cells.
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mTOR (mammalian target of rapamycin) is a protein kinase that regulates cell cycle progression and cell growth. Rapamycin is a highly specific inhibitor of mTOR in clinical trials for the treatment of breast and other cancers. mTOR signaling was reported to require phosphatidic acid (PA), the
Alternative phospholipase D/mTOR survival signal in human breast cancer cells.
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Cancer cells generate survival signals to suppress default apoptotic programs that protect from cancer. Phosphatidylinositol-3-kinase (PI3K) generates a survival signal that is frequently dysregulated in human cancers. Phospholipase D (PLD) has also been implicated in signals that promote survival.
mTOR-dependent suppression of protein phosphatase 2A is critical for phospholipase D survival signals in human breast cancer cells.
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A critical aspect of tumor progression is the generation of survival signals that overcome default apoptotic programs. Recent studies have revealed that elevated phospholipase D activity generates survival signals in breast and perhaps other human cancers. We report here that the elevated
Autoregulation of phospholipase D activity is coupled to selective induction of phospholipase D1 expression to promote invasion of breast cancer cells.
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Phospholipase D (PLD) is an important signaling enzyme implicated in the control of many biological processes, including cell proliferation and survival. Despite the importance of the duration and amplitude of PLD signaling in carcinogenesis, mechanisms that regulate PLD expression remain poorly
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