5 research outputs found

    Alterations in lipid transfer to High-Density Lipoprotein (HDL) and activity of paraoxonase-1 in HIV+ patients AlteraçÔes na transferĂȘncia de lĂ­pides para a lipoproteĂ­na de alta densidade (HDL) e atividade da paroxonase 1 em pacientes HIV+

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    HIV+ patients often develop alterations of the plasma lipids that may implicate in development of premature coronary artery disease. High-density lipoprotein (HDL) has an important role in preventing atherogenesis and the aim of this study was to investigate aspects of HDL function in HIV+ patients. HIV+ patients (n = 48) and healthy control subjects (n = 45) of both sexes with similar age were studied. Twenty-five were not being treated with antiretroviral agents, 13 were under reverse transcriptase inhibitor nucleosidic and non-nucleosidic (NRTI+NNRTI) and 10 were under NRTI + protease inhibitors (NRTI+PI) treatment. Paraoxonase 1 (PON1) activity and the transfer of free and esterified cholesterol, tryglicerides and phospholipids from a lipidic nanoemulsion to HDL were analyzed. In comparison with healthy controls, HIV+ patients presented low PON-1 activity and diminished transfer of free cholesterol and tryglicerides. In contrast, phospholipid transfer was increased in those patients, whereas the transfer of cholesteryl esters was unchanged. NRTI+NNRTI increases the transfer of cholesteryl esters and triglycerides but in NRTI+PI there was no difference in respect to non-treated HIV+ patients. HDL from HIV+ patients has smaller antioxidant properties, as shown by lower PON-1 activity, and the transfer of lipids to this lipoprotein fraction is also altered, suggesting that HDL function is defective in those patients.<br>Pacientes HIV+ freqĂŒentemente desenvolvem alteraçÔes no metabolismo de lĂ­pides que podem influir no desenvolvimento de doença arterial coronĂĄria. A lipoproteĂ­na de alta densidade (HDL) tem papel importante na prevenção da aterogĂȘnese. Para investigar aspectos funcionais da HDL na doença, foram estudados 48 pacientes HIV+ e 45 indivĂ­duos-controle saudĂĄveis de ambos os sexos, com idade semelhantes. Vinte e cinco pacientes HIV+ nĂŁo recebiam terapia antirretroviral, 13 estavam sob tratamento com inibidores nucleosĂ­dicos de transcriptase reversa e nĂŁo-nucleosĂ­dicos (NRTI+NNRTI) e 10 sob tratamento com NRTI e inibidor de protease (NRTI+PI). Analisou-se a atividade da paroxonase 1 e a transferĂȘncia de colesterol livre e esterificado, triglicĂ©rides e fosfolipĂ­dios de uma nanoemulsĂŁo lipĂ­dica para a HDL. Pacientes HIV+ apresentaram menor atividade da paroxonase 1 e menor transferĂȘncia de colesterol livre e triglicĂ©rides em relação aos indivĂ­duos saudĂĄveis. A transferĂȘncia de fosfolipĂ­dios foi maior nesses pacientes, mas a transferĂȘncia de Ă©ster de colesterol foi similar. NRTI+NNRTI aumenta a transferĂȘncia de Ă©ster de colesterol e triglicĂ©rides, mas em NRTI+PI nĂŁo houve diferença comparando com os pacientes HIV+ nĂŁo tratados. A HDL de pacientes HIV+ tem propriedades antioxidantes reduzidas, evidenciada pela menor atividade da paraxonase 1, e transferĂȘncia de lipĂ­dios alterada, sugerindo que a HDL apresente função defeituosa nestes pacientes

    Host Defence Cryptides from Human Apolipoproteins: Applications in Medicinal Chemistry

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