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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

Envolvimento da endotelina-1, de receptores (TRPV1 E NMDA) e da substÃncia p na neuropatia sensitiva perifÃrica induzida pelo agente antineoplÃsico oxaliplatina / Involvement of endothelin-1, receptors (TRPV1 and NMDA) and neuropeptide sp in peripheral sensitive neuropathy induced by antineoplastic agent oxaliplatin

Renata Bessa Pontes 27 August 2015 (has links)
nÃo hà / IntroduÃÃo: A neurotoxicidade cumulativa à uma toxicidade que pode advir da terapia à base de oxaliplatina (OXL), que à a 3 geraÃÃo de agentes platinos com amplo espectro de atividade antitumoral, incluindo cÃncer colorretal, ovariano e pulmonar. A neurotoxicidade associada à OXL gera uma toxicidade dose-limitante, crÃnica, a neuropatia sensitiva perifÃrica (NSP). Objetivo: Investigar o envolvimento da endotelina-1, de receptores TRPV1 e NMDA e da substÃncia P envolvidos na patogÃnese da neuropatia sensitiva perifÃrica induzida pelo agente antineoplÃsico oxaliplatina. Materiais e mÃtodos: O estudo foi aprovado pelo Comità de Ãtica em Pesquisa Animal da UFC (protocolo n 75/12). Camundongos Swiss machos (20g) foram prÃ-tratados com antagonistas de receptores de endotelina-1 (Bosentana 100mg/kg, VO; BQ-123 e BQ-788 30Âl, intraplantar) e antagonistas do receptor TRPV1 (capsazepina, 5mg/kg, IP), antagonista do receptor NK-1 da Substancia P (apreptanto, 1mg/kg, IP) e antagonista de receptores NMDA (MK-801, 0,5mg/kg, IP) 30 minutos antes da administraÃÃo de OXL (1mg/kg, IV) por 4 semanas e meia. Paralelamente foram realizados testes nociceptivos para avaliar o desenvolvimento da neuropatia sensitiva perifÃrica. A hipernocicepÃÃo foi avaliada pelo teste de imersÃo da cauda (TIC) em Ãgua fria (10ÂC) ou aquecida (43ÂC) e pelo teste Von Frey (HPM). Em seguida, foi realizado imunofluorescÃncia do segmento medular e gÃnglio da raiz dorsal e RT-PCR. Resultados: Como resultados observou-se que com o prÃ-tratamento ao uso de OXL que houve atenuaÃÃo da hiperalgesia da NSP induzida por OXL. Ao realizar a administraÃÃo de antagonistas seletivos de endotelina-1 intraplantar na pata direita observou-se reduÃÃo significativa na hiperalgesia na pata direita (tratada) em comparaÃÃo à pata esquerda (controle). Ao analisar a expressÃo gÃnica para cFos, NK-1 e o receptor de endotelina B, observou-se que houve reduÃÃo significativa da expressÃo dos marcadores no grupo prÃ-tratado com Bosentana ao comparar com o grupo OXL, que demonstrou a expressÃo aumentada para esses marcadores. ConclusÃo: Conclui-se no presente estudo que hà evidÃncias do papel da endotelina-1, de receptores (TRPV1 e NMDA) e da substÃncia P na patogÃnese da NSP induzida pelo agente antineoplÃsico OXL. / Introduction: The cumulative neurotoxicity is a toxicity that can result from oxaliplatin-based therapy (OXL), which is the 3rd generation platinum agent with broad spectrum of antitumor activity, including colorectal, ovarian and lung cancer. Neurotoxicity associated with OXL generates a dose-limiting toxicity, chronic, peripheral sensory neuropathy (NSP). Objective: To investigate the involvement of endothelin-1, TRPV1 receptors and NMDA and substance P involved in the pathogenesis of peripheral sensory neuropathy induced by oxaliplatin antineoplastic agent. Methods: Male Swiss mice (20g) were pre-treated with antagonists of endothelin-1 receptors (Bosentan 100mg / kg orally; BQ-123 and BQ-788 30μl, intraplantar) and TRPV1 receptor antagonists (capsazepine, 5mg / kg , IP), antagonist of NK-1 receptor for substance P (apreptanto, 1 mg / kg, IP), and a NMDA receptor antagonist (MK-801, 0.5mg / kg, IP) 30 minutes before administration of OXL (1mg / kg, IV) for 4.5 weeks. Parallel nociceptive tests performed to assess the development of peripheral sensory neuropathy. The hyperalgesia assessed by the tail immersion test (ICT) in cold water (10 C) or warm (43 C) and test Von Frey (HPM). Then it was performed spinal segment, and the dorsal root ganglion immunofluorescence and RT-PCR the Ethics Committee approved the study for Animal Research UFC (Protocol 75/12). Results: The results observed when using the antagonists, as a pretreatment to the use of OXL there was attenuation of the induced hyperalgesia (NSP) OXL. Upon administration of selective antagonists of endothelin in the right paw was significant reduction in paw hyperalgesia in the right (treated) compared to the left paw (control). By analyzing the gene expression of cFos, NK-1 and endothelin B receptor, it was observed that there was significant reduction of expression of the markers in pre-treated bosentan group versus OXL group that showed increased expression for these markers. Conclusion: It was concluded in this study that there is evidence of the role of endothelin-1 receptors (TRPV1 and NMDA) and substance SP in the pathogenesis of NSP induced antineoplastic agent OXL.

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