Análise por PCR do efeito da terapia fotodinâmica em tumores mamários

Autores

DOI:

https://doi.org/10.33448/rsd-v10i12.20468

Palavras-chave:

Câncer; Expressão genética; Terapia fotodinâmica.

Resumo

A terapia fotodinâmica (TFD) é uma modalidade terapêutica promissora para o tratamento do câncer, incluindo tumores de mama. Os danos oxidativos causados pela TFD culminam na morte celular, indução da resposta imune e na consequente destruição do tumor. Este estudo teve como objetivo avaliar o perfil de expressão genética dos genes BCL-2, BAX e HER-2 e suas proteínas após o TFD, associando-o à necrose causada por essa terapia sob diferentes fluências. Vinte e oito ratas receberam uma única dose de 7,12 - dimetilbenzantraceno (DMBA - 80mg/kg), por gavage, para indução de tumor de mama. Após o crescimento dos tumores, os animais foram divididos em quatro grupos: G1 - grupo controle – tumor de mama não tratado – e grupos G2, G3 e G4 tratados com PDT usando Photogem@ como fotosensibilizante e irradiação intersticiais, com fluências de 50J/cm, 100J/cm e 150J/cm, respectivamente. Amostras de tumores foram colhidas para exame histológico por RT-qPCR. O RT-qPCR mostrou que o perfil de expressão genética de BCL-2, BAX e HER-2 não foi alterado após o TFD. Necrose hemorrágica e dano vascular e celular qualitativamente maior foram observados e correlacionados positivamente com a fluência. O TFD não parece induzir a modulação de genes relacionados à apoptose. Os resultados indicam que o tipo de morte celular estimulada pelo TFD no tumor mamário é a necrose.

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Publicado

26/09/2021

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FERREIRA, I.; SILVA, G. N. da .; FERREIRA-STRIXINO, J.; GRECCO, C. .; BAGNATO, V. S. .; SALVADORI, D. M. F. .; PINTO, J. G. .; ROCHA, N. S. Análise por PCR do efeito da terapia fotodinâmica em tumores mamários. Research, Society and Development, [S. l.], v. 10, n. 12, p. e459101220468, 2021. DOI: 10.33448/rsd-v10i12.20468. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/20468. Acesso em: 22 nov. 2024.

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Ciências da Saúde