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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2018.tde-30012018-101101
Document
Author
Full name
Jennifer Eliana Montoya Neyra
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Belizario, Jose Ernesto (President)
Malpartida, Humberto Miguel Garay
Santelli, Glaucia Maria Machado
Weinlich, Ricardo
Title in Portuguese
Modulação dos efeitos citotóxicos dos vemurafenibe pela cloroquina em células de melanoma maligno G-361: papel da dermicidina.
Keywords in Portuguese
Autofagia
BRAF
Cloroquina
Melanoma
Senescência
Vemurafenibe
Abstract in Portuguese
Neste estudo foram avaliados os efeitos farmacológicos do vemurafenibe (inibidor BRAFV600E) e da cloroquina (inibidor de autofagia) na viabilidade celular e crescimento tumoral das sublinhagens de melanoma:G361 pLKO que expressa dermicidina e G361 IBC I com silenciamento da expressão. As células G-361 responderam a vemurafenibe (2 μM) e cloroquina (100 μM), isoladamente ou combinadas, com aumento apoptose, e redução das taxas de senescência. Vemurafenibe (50 mg/kg / 21 dias) inibiu o crescimento tumoral em camundongos imunodeficientes independente da expressão da DCD. A combinação com Cloroquina (30 mg/kg) a cada 24 horas, acelerou, enquanto a cada 72 horas, reduziu o crescimento tumoral. Os tumores apresentaram alterações morfológicas e núcleos atípicos; e não expressaram os marcadores S100, HMB-45, Mela-A ou citoqueratinas. Este trabalho confirmar a eficácia do vemurafenibe e sugere o potencial adjuvante da cloroquina no tratamento de melanomas. O estudo também confirma o papel da dermcidina como oncogne e fator de crescimento de células de melanoma maligno.
Title in English
Modulation of cytotoxic effects of vemurafenib by chloroquine in malignant melanoma cells G-361: role of dermcidin.
Keywords in English
Apoptosis
Autophagy
BRAF
Chloroquine
Dermcidin
Melanoma
Senescence
Vemurafenib
Abstract in English
In this study we evaluated the pharmacological effects of vemurafenib ( inhibitor BRAFV600E) and chloroquine (autophagy inhibitor) in cell viability and tumor growth of two melanoma cell lines identified as G-361 pLKO, which expresses dermcidin, and G361 IBC I which silenced DCD expression. G-361 melanoma cells responded to vemurafenib (1-2 μM) and chloroquine (50-100 μM) alone or combined, with increased apoptosis rates, while decreasing senescent cells. Vemurafenib (50 mg/kg / 21 days) inhibited melanoma growth in immunodeficient mice independent of dermicidin. Chloroquine (30 mg/kg) in combination with vemurafenib, accelerated (at 24 hour interval), and reduced (at 72 hours interval), melanoma growth. Tumor tissues showed atypical cell morphology and nuclear histological patterns and melanocytic differentiation biomarkers S100, HMB-45, Melan-A or pancytokeratins were not. This work confirms the efficacy of vemurafenib and suggests potential adjuvant effect of chloroquine. It also confirms the role of dermcidin as growth factor and oncogene for melanoma cells.
 
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Publishing Date
2018-01-31
 
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