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Influence of cholesterol synthesis and absorption on expression of proteins of the cholesterol reverse transport in HepG2 and CACO-2 cells

Grant number: 09/15125-8
Support type:Regular Research Grants
Duration: February 01, 2010 - January 31, 2012
Field of knowledge:Health Sciences - Pharmacy
Principal Investigator:Rosario Dominguez Crespo Hirata
Grantee:Rosario Dominguez Crespo Hirata
Home Institution: Faculdade de Ciências Farmacêuticas (FCF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Inhibitors of cholesterol synthesis (statins) and intestinal absorption (ezetimibe) are potent lowering-cholesterol drugs that reduce the risk for coronary events mainly due to the reduction of plasma low-density lipoprotein (LDL) cholesterol. Statins may also affect the concentration of high-density lipoprotein (HDL) cholesterol, known as atheroprotective, mainly due to its role on cholesterol reverse transport (CRT). However, the response to HDL cholesterol to treatment with statins is highly variable. Therefore, it is of interest to study the regulatory mechanism of proteins involved in CRT, such as ATP-binding cassette transporter A1 e G1 (ABCA1 e ABCG1), apolipoprotein E (ApoE) and scavenger receptor BI (SRBI), mediated by lowering-cholesterol drugs. This study aims to investigate the effects of statins and ezetimibe on expression of ABCA1, ABCG1, ApoE e SRBI in human hepatocyte (HepG2) and enterocyte (Caco-2) cell lines. The cells will be incubated with different concentrations of lowering-cholesterol drugs to evaluate cellular viability and fragmentation by optic microscopy and flow citometry. The mRNA expression of ABCA1, ABCG1, ApoE and SRBI will be measured by quantitative real time PCR (PCRq) and the protein expression will be evaluated by Western blotting and flow citometry. The activity of transcription factors involved in regulation of these genes, such as LXR±, LXR² and SREBP2, will be analyzed by electrophoresis mobility shift assay (EMSA) that allows to situdy the DNA-proteins interactions. The effects of lowering-lipid drugs on transcript stability will be measured by PCRq. The results of this study will contribute to the knowledge of the mechanisms involved on modulation of proteins of the CRT by lowering-lipid drugs. This knowledge would aid the development of new pharmacological strategies that increase HDL in plasma and reduce coronary events in individuals with cardiovascular risk. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CERDA, ALVARO; ISSA, MUSTAFA H.; GENVIGIR, FABIANA D. V.; ROHDE, CINTIA B.; CAVALLI, SELMA A.; BERTOLAMI, MARCELO C.; FALUDI, ANDRE A.; HIRATA, MARIO H.; HIRATA, ROSARIO D. C. Atorvastatin and hormone therapy influence expression of ABCA1, APOA1 and SCARB1 in mononuclear cells from hypercholesterolemic postmenopausal women. JOURNAL OF STEROID BIOCHEMISTRY AND MOLECULAR BIOLOGY, v. 138, p. 403-409, NOV 2013. Web of Science Citations: 7.
CERDA, ALVARO; GENVIGIR, FABIANA D. V.; WILLRICH, MARIA A. V.; ARAZI, SIMONE S.; BERNIK, MARCIA M. S.; DOREA, EGIDIO L.; BERTOLAMI, MARCELO C.; FALUDI, ANDRE A.; HIRATA, MARIO H.; HIRATA, ROSARIO D. C. Apolipoprotein E mRNA expression in mononuclear cells from normolipidemic and hypercholesterolemic individuals treated with atorvastatin. LIPIDS IN HEALTH AND DISEASE, v. 10, NOV 10 2011. Web of Science Citations: 6.
CERDA, ALVARO; GENVIGIR, FABIANA DALLA VECCHIA; RODRIGUES, ALICE CRISTINA; VIEIRA WILLRICH, MARIA ALICE; DOREA, EGIDIO LIMA; SILVEIRA BERNIK, MARCIA MARTINS; ARAZI, SIMONE SORKIN; DE OLIVEIRA, RAQUEL; HIRATA, MARIO HIROYUKI; CRESPO HIRATA, ROSARIO DOMINGUEZ. Influence of Polymorphisms and Cholesterol-Lowering Treatment on SCARB1 mRNA Expression. JOURNAL OF ATHEROSCLEROSIS AND THROMBOSIS, v. 18, n. 8, p. 640-651, 2011. Web of Science Citations: 9.
GENVIGIR, FABIANA DALLA VECCFHIA; RODRIGUES, ALICE CRISTINA; CERDA, ALVARO; ARAZI, SIMONE SORKIN; VIEIRA WILLRICH, MARIA ALICE; OLIVEIRA, RAQUEL; HIRATA, MARIO HIROYUKI; DOREA, EGIDIO LIMA; BERNIK, MARCIA MARTINS; CURI, RUI; HIRATA, ROSARIO DOMINGUEZ CRESPO. Effects of lipid-lowering drugs on reverse cholesterol transport gene expressions in peripheral blood mononuclear and HepG2 cells. PHARMACOGENOMICS, v. 11, n. 9, p. 1235-1246, SEP 2010. Web of Science Citations: 16.

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