0000000000055029

AUTHOR

Alessandra Auriemma

showing 3 related works from this author

Leptin/HER2 crosstalk in breast cancer: in vitro study and preliminary in vivo analysis.

2008

Abstract Background Obesity in postmenopausal women is associated with increased breast cancer risk, development of more aggressive tumors and resistance to certain anti-breast cancer treatments. Some of these effects might be mediated by obesity hormone leptin, acting independently or modulating other signaling pathways. Here we focused on the link between leptin and HER2. We tested if HER2 and the leptin receptor (ObR) can be coexpressed in breast cancer cell models, whether these two receptors can physically interact, and whether leptin can transactivate HER2. Next, we studied if leptin/ObR can coexist with HER2 in breast cancer tissues, and if presence of these two systems correlates wi…

LeptinTranscriptional Activationmedicine.medical_specialtyCancer ResearchReceptor ErbB-2Breast Neoplasmslcsh:RC254-282Breast cancerSurgical oncologyRisk FactorsInternal medicineCell Line TumormedicineGeneticsHumansObesityReceptorskin and connective tissue diseasesneoplasmsLeptin receptorbusiness.industryLeptinCarcinoma Ductal BreastReceptor Cross-Talklcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogensmedicine.diseaseImmunohistochemistryGene Expression Regulation NeoplasticPostmenopauseEndocrinologyOncologyImmunohistochemistryReceptors LeptinFemaleSignal transductionbusinessImmunostainingProtein BindingResearch ArticleBMC cancer
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Insulin-dependent leptin expression in breast cancer cells.

2008

Abstract Pathologic conditions associated with hyperinsulinemia, such as obesity, metabolic syndrome, and diabetes, seem to increase the risk of breast cancer. Here, we studied molecular mechanisms by which insulin activates the expression of leptin, an obesity hormone that has been shown to promote breast cancer progression in an autocrine or paracrine way. Using MDA-MB-231 breast cancer cells, we found that (a) insulin stimulated leptin mRNA and protein expression, which was associated with increased activation of the leptin gene promoter; (b) insulin increased nuclear accumulation of transcription factors hypoxia inducible factor (HIF)-1α and Sp1 and their loading on the leptin promoter;…

LeptinTranscriptional ActivationCancer Researchmedicine.medical_specialtySmall interfering RNAChromatin ImmunoprecipitationSp1 Transcription FactorBlotting WesternFluorescent Antibody TechniqueBreast NeoplasmsEnzyme-Linked Immunosorbent AssayBiologyParacrine signallingPhosphatidylinositol 3-Kinasesbreast cancerInternal medicinemedicineHyperinsulinemiaTumor Cells CulturedHumansHypoglycemic AgentsInsulinRNA MessengerRNA Small InterferingAutocrine signallingLuciferasesPromoter Regions GeneticTranscription factorCell NucleusMitogen-Activated Protein Kinase 1Gene knockdownLeptin receptorMitogen-Activated Protein Kinase 3Reverse Transcriptase Polymerase Chain ReactionLeptinmedicine.diseaseHypoxia-Inducible Factor 1 alpha SubunitCell HypoxiaEndocrinologyOncologyCancer researchFemalehormones hormone substitutes and hormone antagonistsCancer research
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Mechanism of leptin expression in breast cancer cells: role of hypoxia-inducible factor-1α

2007

We reported previously that the obesity hormone leptin is overexpressed in breast cancer biopsies. Here, we investigated molecular mechanisms involved in this process, focusing on conditions that are associated with obesity, that is, hyperinsulinemia and induction of hypoxia. By using quantitative real-time PCR, immunofluorescent detection of proteins and enzyme-linked immunosorbent assays, we found that treatment of MCF-7 breast cancer cells with high doses of insulin or the hypoxia-mimetic agent CoCl2, or culturing the cells under hypoxic conditions significantly increased the expression of leptin mRNA and protein. Notably, the greatest leptin mRNA and protein expression were observed und…

Transcriptional ActivationCancer Researchmedicine.medical_specialtyActive Transport Cell NucleusBreast NeoplasmsBiologymedicine.disease_causeleptinbreast cancerInternal medicineCoactivatorGene expressionTumor Cells CulturedGeneticsmedicineHumansInsulinHIFp300-CBP Transcription FactorsPromoter Regions GeneticMolecular BiologyCell NucleusRegulation of gene expressionBinding SitesLeptin receptorLeptinPromoterCobaltHypoxia-Inducible Factor 1 alpha SubunitCell HypoxiaGene Expression Regulation NeoplasticEndocrinologyhyperinsulinemiaCarcinogenesisChromatin immunoprecipitationhormones hormone substitutes and hormone antagonistsProtein BindingOncogene
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