Thesis (Ph. D.)--Case Western Reserve University, 2008. / [School of Medicine] Department of Biochemistry. Includes bibliographical references.

Thesis (Ph. D.)--University of Michigan, 1997. / Includes bibliographical references.

Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xiii, 172 p.; also includes graphics (some col.). Includes bibliographical references (p. 131-172 ). Available online via OhioLINK's ETD Center

Thesis (Ph.D.)--University of Michigan, 1997. / Includes bibliographical references.

This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).

This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).

Thesis (Ph. D.)--Virginia Commonwealth University, 2009. / Prepared for: Dept. of Medicinal Chemistry. Title from title-page of electronic thesis. Bibliography: leaves 126-138.

Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references.

Orientador: Claudia Herrera Tambeli / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-20T01:36:46Z (GMT). No. of bitstreams: 1 Macedo_CristinaGomesde_M.pdf: 777542 bytes, checksum: 9fba5bed6fd851b4349bf4812dda8d33 (MD5) Previous issue date: 2012 / Resumo: Disfunções temporomandibulares são condições dolorosas que envolvem a articulação temporomandibular e os músculos mastigatórios com maior prevalência, severidade e duração no sexo feminino. Recentemente foi demonstrado que a testosterona apresenta um efeito protetor ao diminuir o risco de ratos desenvolverem dor na Articulação Temporomandibular (ATM), o que explica pelo menos em parte, a menor prevalência de dor no sexo masculino. No entanto, o mecanismo através do qual a testosterona induz o efeito protetor em machos não é conhecido. Assim, o objetivo deste trabalho foi investigar se o efeito protetor da testosterona é mediado pela ativação do sistema opióide endógeno no sistema nervoso central e quais os subtipos de receptores opióides estão envolvidos nesse efeito protetor sobre o desenvolvimento de dor na ATM em ratos. Para o procedimento experimental foram usados ratos machos Wistar (230-300 g), intactos, gonadectomizados (Gx) e sham gonadectomizados (sham Gx) e a injeção de formalina 0,5% na ATM foi usada como estímulo nociceptivo. Para testar o envolvimento de um mecanismo neural central dependente da ativação do sistema opióide, os animais receberam injeção de naloxona, antagonista não seletivo de receptores opióides, CTOP, Naltrindole e Nor-BNI, antagonistas opióides seletivos para os subtipos de receptores opióides mu (µ ), delta e capa (µ ), respectivamente na região do núcleo sensorial trigeminal, antes do teste da formalina na ATM. A administração da Naloxona (15?g) antagonista não seletivo ou a combinação dos antagonistas de receptor µ opióide CTOP (30µ g/10µ l) mais o de receptor µ opióide Nor- BNI (90µ g/10µ l) aumentou significativamente a nocicepção induzida pela formalina 0,5% na ATM em ratos sham Gx, mas não em ratos Gx (31.09%, n = 6 e 26,9%, n = 6; respectivamente) A resposta de ratos intactos a estes tratamentos foi semelhante à de ratos sham Gx. Em contraste, a administração de cada antagonista de receptores opióides sozinhos ou a combinação de CTOP (30µ g/10µ l) mais o antagonista do receptor delta opióide Naltrindole (90µ g/10µ l) ou de Nor-BNI (90µ g/10µ l) mais Naltrindole (90µ g/10µ l) não afetou a nocicepção induzida pela formalina 0,5% em ratos Gx, intactos e sham Gx. Estes resultados sugerem que o efeito protetor da testosterona no desenvolvimento da dor na ATM depende da liberação de opióides endógenos e a subseqüente ativação dos receptores opióides mu e capa no sistema nervoso central. Conclui-se que a ativação individual dos subtipos de receptores é insuficiente enquanto que a co-ativação dos receptores opióides µ e k é necessária para mediar o efeito protetor da testosterona / Abstract: Temporomandibular Joints (TMJ) dysfunctions are painful conditions involving the masticatory muscles and temporomandibular joint with higher prevalence, severity and duration in females. Recently it was shown that testosterone has a protective effect by reducing the risk of rat develop pain in TMJ, which explains at least in part, the lower prevalence of pain in males. However, the mechanism through which the testosterone induces protective effect in males is not known. Thus, the aim of this study was to investigate whether the protective effect of testosterone is mediated by activation of endogenous opioid system in the central nervous system and what subtypes of opioid receptors are involved in this protective effect on the development of TMJ pain in rats. For the experimental procedure Intact, gonadectomized and sham Wistar (230-300g) male rats were used and all experimental procedures were approved by the Ethics Committee in Animal Research at the UNICAMP. The TMJ injection of 0.5% formalin was used as a nociceptive stimulus. The nociceptive behavior was quantified for 45 minutes and used as a quantitative nociceptive behavior measure that was defined as the cumulative total number of seconds that the animal spent rubbing the orofacial region asymmetrically with the ipsilateral fore or hind paw plus the number of head flinches counted during the observation period. Administration of the opioid receptor antagonist naloxone 15 mg or the combination of the mu-opioid receptor antagonists CTOP (30µ g/10µ l) plus the kappa-opioid receptor antagonist nor-binaltorphimine (90µ g/10µ l), significantly increased TMJ 0.5% formalin-induced nociception in sham (31.09%, n=6 and 26.9%, n=6; respectively) but not in gonadectomized rats. The response of intact rats to these treatments was similar to that of sham rats. In contrast, the administration of each opioid receptor antagonist alone or the combination of CTOP (30µg/10µ l) plus the delta-opioid receptor antagonist Naltrindole (90µ g/10µ l) or of Nor-binaltorphimine (90µ g/10µ l) plus Naltrindole (90µ g/10µ l) did not affect TMJ 0.5% formalin-induced nociception in intact, sham and gonadectomized rats. These findings suggest that the protective effect of testosterone on TMJ pain development depends on the release of endogenous opioids and on the subsequent activation of mu and kappa opioid receptors in the central nervous system. The conclusion is that the selective activation of individual receptor subtypes is insufficient while the co-activation of µ and k opioid receptors is necessary to mediate the protective effect of testosterone / Mestrado / Fisiologia Oral / Mestre em Odontologia

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 7 uppsatser.