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Previous issue date: 2015-10-27 / O uso terap?utico de plantas medicinais tem contribu?do desde a antiguidade de forma ben?fica para a sa?de. No entanto, muitas esp?cies carecem de evid?ncias cient?ficas que forne?am embasamento para a sua utiliza??o na pr?tica terap?utica. Neste contexto, encontra-se a esp?cie Genipa americana L. (Rubiaceae), conhecida popularmente como jenipapo e utilizada como antissifil?tica, antiulcerosa e anti-hemorr?gica, contra hematomas, como t?nico, afrodis?aco, etc. Visto que, essa esp?cie carece de estudos toxicol?gicos, o objetivo deste trabalho foi avaliar a toxicidade in vivo (toxicidade aguda e subcr?nica) e in vitro (citotoxicidade) do extrato dos frutos da G. americana. O extrato hidroetan?lico dos frutos de G. americana foi preparado por macera??o. Foi realizada uma an?lise fitoqu?mica preliminar para avaliar a presen?a de metab?litos secund?rios no extrato. No estudo da citotoxicidade do extrato (0,1; 1,0; 10; 100 e 1000 ?g/100?L) foram utilizadas linhagens de c?lulas normais (3T3) e tumorais (786-0, HepG2 e B16), analisados pelo ensaio do MTT. Para a avalia??o da toxicidade aguda (dose ?nica de 2000 mg/Kg) e subcr?nica (100, 500 e 1000 mg/Kg por 30 dias) foram utilizados camundongos Swiss de ambos os sexos. Ao final dos experimentos, amostras de sangue e ?rg?os foram coletados para an?lise. Os dados entre os grupos foram comparados pelo test T ou por ANOVA com p?s-teste de Dunnett com n?vel de signific?ncia de 5%. O estudo fitoqu?mico do extrato indicou principalmente a presen?a de irid?ides. Os ensaios de citotoxicidade apresentaram resultados de at? 70% de inibi??o celular frente ? linhagem de B16, na dose de 1000 ?g/100?L, e at? 29% frente ? linhagem 786-0, na dose de 10 ?g/100?L. O extrato n?o promoveu morte nas c?lulas 3T3 e HepG2. Durante as avalia??es in vivo, n?o houve mortes de animais. A an?lise das amostras de sangue revelou que os animais submetidos ? avalia??o da toxicidade aguda apresentaram leves altera??es hep?ticas, e que os animais submetidos ? avalia??o da toxicidade subcr?nica apresentaram altera??es no peso relativo do rim esquerdo e na concentra??o plasm?tica de ur?ia. N?o foram observadas diferen?as entre grupos testes e controles na avalia??o histopatol?gica dos ?rg?os coletados. Apesar das altera??es encontradas nos ensaios de toxicidade in vivo, segundo os crit?rios descritos pelos Guias OECD, sugere-se que o extrato hidroetan?lico dos frutos da G. americana seja classificado como de baixa toxicidade. A citotoxicidade do extrato sugere que omesmo possui potencial contra as linhagens de melanoma (B16) e carcinoma renal (786-0). / The therapeutic use of medicinal plants has contributed since antiquity in a beneficial way for health. However, many species lacks of scientific evidence which provide basis for their use in therapeutic practice. In this context is the Genipa americana L. species (Rubiaceae), popularly known as jenipapo and used to treat syfilis, ulcer and hemorrhagic disturbs. It's also used against bruising, as tonic and as aphrodisiac. Due this species lacks toxicological studies, the aim of this study was to evaluate the toxicity in vivo (acute and sub-chronic toxicity) and in vitro (cytotoxicity) of the hydroethanolic extract from G. americana fruits. The hydroethanolic extract of G. americana fruits was prepared by maceration. A preliminary phytochemical analysis was performed to assess the presence of secondary metabolites in the extract. The cytotoxicity study of the extract (0.1, 1.0, 10, 100 and 1000 mg / 100 ul) were performed against normal cells (3T3) and tumor (786-0, HepG2 and B16), analyzed by the MTT assay. To evaluate the acute (single dose of 2000 mg / Kg) and subchronic (100, 500 and 1000 mg / kg for 30 days) toxicity Swiss mice of both sexes were used. At the end of the experiment, blood samples and organs were collected for analysis. Data between groups were compared by t test or ANOVA with Dunnett's post-test with 5% significance level. The phytochemical study of the extracts mainly indicated the presence of iridoids. Results for cytotoxicity tests showed up to 70% inhibition of B16 cell line at a dose of 1000 mg / 100 ul, and up to 29% inhibition of 786-0 at a dose of 10 ug / 100 ul. The extract did not cause death in 3T3 and HepG2 cells. During the in vivo assays, there were no animal deaths. Analysis of blood samples revealed that the animals submitted to the evaluation of acute toxicity had changes in AST and ALT, and that the animals evaluated for subchronic toxicity showed changes in the relative wet weight of the kidney and plasma urea concentration. No differences were observed between groups on histopathological evaluation of the collected organs. Despite the changes found in the in vivo toxicity tests, using the criteria described by the OECD Guidelines, it is suggested that the hydroethanolic extract of the fruits of the G. americana is classified as low toxicity. The cytotoxicity of the extract suggests that they have potential against melanoma cell lines (B16).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20796 |
| Date | 27 October 2015 |
| Creators | Assis, Cinthya Saraiva de |
| Contributors | 70155780425, http://lattes.cnpq.br/4311626091295357, Kujbida, Paula da Silva, 28974955881, http://lattes.cnpq.br/2285854300593624, R?go, Moacyr Jesus Barreto de Melo, 05189077403, http://lattes.cnpq.br/7233767393471644, Langassner, Silvana Maria Zucolotto, Lemos, Telma Maria Ara?jo Moura |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS FARMACEUTICAS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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