Síntese e caracterização de ácido-all-trans-retinoico incorporado a nanofibras poliméricas e seus efeitos sobre células de osteossarcoma
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Data
2018-05-02
Autores
Girondi, Camila Miorelli
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Universidade Estadual Paulista (Unesp)
Resumo
As nanofibras (NF) podem ser sintetizadas por meio de eletrofiação, um método simples que permite incorporação de fármacos em biopolímeros que apresentam a vantagem de serem liberados de forma gradual. Policaprolactona (PCL) apresenta a vantagem de poder ser eletrofiada permitindo a incorporação de fármacos. Os ácidos retinoicos são fármacos empregados no tratamento de osteossarcoma, mas, apresentam efeitos colaterais. O ATRA (all-trans-retinoic-acid) é o mais comum entre os retinoides. Os objetivos deste estudo foram: sintetizar e caracterizar NF, incorporar o fármaco a elas e verificar a liberação ao meio de cultura; realizar testes de citoxicidade e genotoxicidade tais como: crescimento, integridade, viabilidade e micronúcleo de células MG63 tratadas com NF incorporada com ATRA e analisar a secreção das citocinas pró inflamatórias: IL-1β, IL-6 e TNF-α por meio do teste ELISA. As NF sintetizadas por meio da eletrofiação foram caracterizadas morfologicamente e bioquimicamente por meio de microscopia eletrônica de varredura (MEV) e estudo do espectro de infravermelho da transformada de Fourrier (FTIR): Os testes in vitro foram realizados utilizando uma linhagem de células imortalizadas de osteossarcoma, MG63. Os ensaios incluídos nesse estudo foram divididos em grupos compostos por: [C (controle puro), ATRA (controle positivo), NF (controle negativo) e NF + ATRA (grupo experimental).] Em todos os grupos foram realizados testes de viabilidade celular (MTT), micronúcleo e ELISA sob os tempos de 3, 7 e 14 dias. A liberação do fármaco através do sistema de NF+ATRA foi comprovada pelo FTIR. Os demais resultados encontrados foram avaliados através do teste ANOVA one-way, no qual o método apresentou-se eficiente, mostrando diferença estatística de p=0,00, sendo signficante para todos os períodos de tempo nos testes de MTT e MN, além de ser verificada a secreção de citocinas proinflamatórias IL-1β e IL-6, comprovando os efeitos citotóxicos e genotoxicos sob células MG63 mostrando a efetividade da técnica. Podendo ser uma alternativa para o tratamento.
Nanofibers (NF) can be synthesized by electro-spinning, a simple method that allows incorporation of drugs into biopolymers that have the advantage of being released gradually. Polycaprolactone (PCL) has the advantage that it can be electrophied allowing the incorporation of drugs. Retinoic acids are drugs used in the treatment of osteosarcoma, but have side effects. ATRA (all-trans-retinoicacid) is the most common retinoid. The objectives of this study were: to synthesize and characterize NF, to incorporate the drug to them and to verify the release to the culture medium; perform cytotoxicity and genotoxicity tests such as: growth, integrity, viability and micronucleus of N63-treated NF-treated cells with ATRA and to analyze the secretion of pro-inflammatory cytokines: IL-1β, IL-6 and TNFα by the ELISA . The NF synthesized by electrophilation were characterized morphologically and biochemically by scanning electron microscopy (SEM) and Fourrier Transform Infrared Spectrum (FTIR) study: In vitro tests were performed using an immortalized osteosarcoma cell line, MG63. The trials included in this study were divided into groups composed of: C (pure control), ATRA (positive control), NF (negative control) and NF + ATRA (experimental group). All groups were tested for cell viability (MTT), micronucleus and ELISA under the times of 3, 7 and 14 days. Release of the drug through the NF + ATRA system was confirmed by FTIR. The other results were evaluated using the oneway ANOVA test, in which the method was efficient, showing a statistical difference of p = 0.00, being significant for all time periods in the MTT and MN tests, besides the secretion of proinflammatory cytokines IL-1β and IL-6, proving the cytotoxic and genotoxic effects under MG63 cells, showing the effectiveness of the technique. It may be an alternative to treatment
Nanofibers (NF) can be synthesized by electro-spinning, a simple method that allows incorporation of drugs into biopolymers that have the advantage of being released gradually. Polycaprolactone (PCL) has the advantage that it can be electrophied allowing the incorporation of drugs. Retinoic acids are drugs used in the treatment of osteosarcoma, but have side effects. ATRA (all-trans-retinoicacid) is the most common retinoid. The objectives of this study were: to synthesize and characterize NF, to incorporate the drug to them and to verify the release to the culture medium; perform cytotoxicity and genotoxicity tests such as: growth, integrity, viability and micronucleus of N63-treated NF-treated cells with ATRA and to analyze the secretion of pro-inflammatory cytokines: IL-1β, IL-6 and TNFα by the ELISA . The NF synthesized by electrophilation were characterized morphologically and biochemically by scanning electron microscopy (SEM) and Fourrier Transform Infrared Spectrum (FTIR) study: In vitro tests were performed using an immortalized osteosarcoma cell line, MG63. The trials included in this study were divided into groups composed of: C (pure control), ATRA (positive control), NF (negative control) and NF + ATRA (experimental group). All groups were tested for cell viability (MTT), micronucleus and ELISA under the times of 3, 7 and 14 days. Release of the drug through the NF + ATRA system was confirmed by FTIR. The other results were evaluated using the oneway ANOVA test, in which the method was efficient, showing a statistical difference of p = 0.00, being significant for all time periods in the MTT and MN tests, besides the secretion of proinflammatory cytokines IL-1β and IL-6, proving the cytotoxic and genotoxic effects under MG63 cells, showing the effectiveness of the technique. It may be an alternative to treatment
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Ácido all-trans-retinoico, Eletrofiação, Nanofibras, Policaprolactona, Cultura de células, Osteossarcoma, All-trans-retinoic acid, Electrospray, Nanofibres, Polycaprolactone, Culture of cells, Osteosarcoma