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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Propriedades anti-inflamat?rias e antioxidantes dos extratos aquosos das folhas de Turnera subulata Sm. E Anacardium occidentale L. / Anti-inflammatory and antioxidant properties of aqueous extracts of Turnera subulata Sm. and Anacardium occidentale L.

Souza, Nat?lia Cabral 25 August 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-11-01T23:16:15Z No. of bitstreams: 1 NataliaCabralSouza_DISSERT.pdf: 6162949 bytes, checksum: a617efb8abda58ca56a363d6c5f97c62 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-11-16T21:48:54Z (GMT) No. of bitstreams: 1 NataliaCabralSouza_DISSERT.pdf: 6162949 bytes, checksum: a617efb8abda58ca56a363d6c5f97c62 (MD5) / Made available in DSpace on 2017-11-16T21:48:54Z (GMT). No. of bitstreams: 1 NataliaCabralSouza_DISSERT.pdf: 6162949 bytes, checksum: a617efb8abda58ca56a363d6c5f97c62 (MD5) Previous issue date: 2017-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Extratos vegetais s?o aplicados amplamente na medicina popular, principalmente na regi?o Nordeste do Brasil. O extrato das folhas de Turnera subulata e Anacardium occidentale, por exemplo, ? aplicado como alternativa no tratamento de diversas doen?as como diabetes, hipertens?o, dor cr?nica, c?ncer e inflama??es. Entretanto, apesar do seu amplo uso, os efeitos desses compostos ainda n?o est?o bem descritos. Deste modo, buscamos avaliar as propriedades antioxidantes e anti-inflamat?rias dos extratos das folhas de T. subulata e A. occidentale em um modelo de inflama??o in vitro, usando o lipopolissac?rideo como estimulo em macr?fagos da linhagem RAW 264.7. Para tanto, fizemos a quantifica??o de marcadores de resposta inflamat?ria na linhagem, assim como a sua capacidade de modula??o das prote?nas cinases ativadas por mit?geno (p38, ERK? e JNK). Adicionalmente, foram realizados ensaios de viabilidade pela rea??o com o brometo de 3-(4,5-dimetiltiazol-2-il)-2,5-difeniltetraz?lio e da sulforhodamina B, avalia??o da modula??o em fator de necrose tumoral alfa e interleucina-1?, al?m de ensaios espec?ficos para a avalia??o antioxidante como o de oxida??o de diclorofluoresce?na em tempo real, quantifica??o das esp?cies reativas do ?cido tiobarbit?rico, prote?nas tiol e carbonila??o de prote?nas. Os extratos apresentaram atividades antioxidantes e anti-inflamat?rias, por ser poss?vel observar que o co-tratamento com o extrato das folhas de T. subulata foi capaz de reduzir o estresse oxidativo nas c?lulas, produzido pela resposta inflamat?ria, tal como, possuiu a capacidade de modular diretamente a resposta inflamat?ria, modulando a atividade dos membros das vias prote?nas cinases ativadas por mit?geno. No extrato das folhas de A. occidentale, os resultados tamb?m demostraram atividade antioxidante, que foi observado a partir da diminui??o do dano oxidativo em macr?fagos tratados com as dosagens de 0,5 e 5 ?g/mL do extrato. Al?m disso, esse extrato reverteu os danos oxidativos e os par?metros inflamat?rios induzidos por lipopolissac?rideo nas c?lulas testadas, sendo capaz de inibir a libera??o do fator de necrose tumoral alfa e interleucina-1?. Marcadores inflamat?rios como receptor toll-like 4, receptor para produtos de glica??o avan?ada e CD40, que s?o induzidos por lipopolissac?rideo tamb?m foram modulados. Posteriormente avaliamos as vias de sinaliza??o envolvidas na resposta inflamat?ria mediada por lipopolissac?rideo. O extrato de A. occidentale bloqueou os efeitos do lipopolissac?rideo na fosforila??o de ERK?, SAPK/JNK e P38. Dessa forma, nossos resultados indicam os poss?veis efeitos antioxidantes e anti-inflamat?rios dos extratos aquosos de T. subulata e A. occidentale e demonstram os poss?veis mecanismos biol?gicos respons?veis por esses efeitos. / Plant extracts are widely applied in popular medicine, mainly in the Northeastern Brazil. The leaf extracts of Turnera subulata and Anacardium occidentale, for example, are applied as an alternative in the treatment of lots diseases such diabetes, hypertension, chronic pain, cancer and inflammation. Despite their wide use, the effects of these are still not well described. Thus, we to evaluate the antioxidant and anti-inflammatory properties of leaf extracts of T. subulata and A. occidentale in an in vitro inflammation model of using lipopolysaccharide macrophage RAW 264.7 cells. Therefore, we quantified the inflammatory response markers in the lineage, as well as its ability to modulate the MAPKs (p38, ERK? and JNK). In addition, MTT and SRB viability tests, TNF-? and IL-1? modulation evaluation were performed, as well as specific tests for antioxidant evaluation such as DCFH, TBARS, thiol proteins and carbonylation of proteins. The extracts presented antioxidant and anti-inflammatory activities, and it was possible to observe that co-treatment with the extract of leaf the T. subulata was able to reduce the oxidative stress in the cells, produced by the inflammatory response, the capacity for modulate directly the inflammatory response, altering the activity of MAPK pathway members. In the extract of leaf the A. occidentale the results also showed antioxidant activity, which was observed when the extract decreased the oxidative damage in cells of macrophages treated with the dosages of 0.5 and 5 ?g/mL. In addition, this extract reversed the oxidative damage and inflammatory parameters induced by lipopolysaccharide in the cells tested, being able to inhibit the release of TNF-? and IL-1?. Inflammatory markers such as TLR4, RAGE and CD40 that are induced by LPS were also modulated. Later, we evaluated the signaling pathways involved in the lipopolysaccharide-mediated inflammatory response. The extract of A. occidentale blocked the effects of lipopolysaccharide on the phosphorylation of ERK?, SAPK/ JNK and p38. In this way, our results indicate the possible antioxidant and anti-inflammatory effects of the aqueous extracts of T. subulata and A. occidentale and demonstrate the possible biological mechanisms responsible for these effects.

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