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Doctoral Thesis
DOI
10.11606/T.59.2012.tde-19092012-200623
Document
Author
Full name
Gisele Cristina Bolfarini
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2012
Supervisor
Committee
Tedesco, Antonio Claudio (President)
Bendhack, Lusiane Maria
Furriel, Rosa dos Prazeres Melo
Gaitani, Cristiane Masetto de
Tiera, Márcio José
Title in Portuguese
Avaliação fotobiológica da ftalocianina de zinco complexada à cucurbiturila aplicada na terapia fotodinâmica e na hipertermia celular
Keywords in Portuguese
Complexo de inclusão
Hipertermia Celular
lipossomas
Terapia Fotodinâmica
Abstract in Portuguese
A ação combinada da Terapia Fotodinâmica (TFD) e da Hipertermia (HPT), projetadas para trabalhar sinergicamente, pode levar a uma considerável regressão de tumores neoplásicos após mínimas doses de dissipação de calor e/ou fotossensitização luminosa. Nesse estudo foi proposto, inicialmente, a formação do complexo de inclusão entre o fármaco fotossensibilizante, ftalocianina de zinco (ZnPc) e a cucurbiturila (CB[7]), de modo a aumentar a solubilidade do fármaco e minimizar sua agregação. Além disso, foi proposto nanoencapsular o complexo em lipossomas, tornando-os bicompatíveis. O complexo de inclusão CB[7]:ZnPc foi preparado pelo método de co-evaporação complementado por liofilização e caracterizado por Ressonância Magnética Nuclear (RMN 1H), Calorimetria Diferencial Exploratória (DSC) e Difração de Raios-X (XDR). As formulações lipossomais foram preparadas pelo método de hidratação do filme lipídico e caracterizadas com relação ao tamanho das vesículas, potencial Zeta, índice de polidispersão e estabilidade. Nos estudos biológicos, utilizando a linhagem neoplásica B16-F10, foi feita uma comparação entre o complexo livre e encapsulado em lipossoma, a fim de estudar o lipossoma como um veículo de liberação de fármacos. Além desse estudo, foi avaliada a toxicidade do lipossoma contendo o complexo de inclusão e o fluido magnético (CB:ZnPc-MLp) na presença de luz e campo magnético. Esse resultado nos mostra que a aplicação da luz e do campo magnético em conjunto, consegue ser mais eficaz do que os mesmos aplicados separadamente, comprovando o efeito sinérgico.
Title in English
Evaluation of the photobiological Phthalocyanine Zinc complexed to Cucurbituril Applied in Photodynamic Therapy and Hyperthermia.
Keywords in English
Hyperthermia
Inclusion Complex
liposome
Photodynamic Therapy
Abstract in English
The combined action of photodynamic therapy (PDT) and hyperthermia (HPT), designed to work synergistically, may lead to a significant regression of neoplasic tumors after minimum doses of heat dissipation and / or light photosensitization. In this study was provided initially, the formation of an inclusion complex between the drug photosensitizer, zinc phthalocyanine (ZnPc) and cucurbit[7]uril (CB [7]) in order to increase the solubility of the drug and minimize aggregation. Furthermore, it was also proposed nanoencapsular liposome complex, making them biocompatible. The inclusion complex CB [7]: ZnPc was prepared by co-evaporation method complemented by lyophilization and characterized by nuclear magnetic resonance (1H-NMR), Differential Scanning Calorimetry (DSC) and X-ray diffraction (XDR). Liposomal formulations were prepared by lipid film hydration and characterized with respect to vesicle size, zeta potential, polydispersity and stability. In the biological studies, using neoplasic cell line B16-F10, a comparison was made between the free complex and the complex encapsulated in liposome in order to study the liposome as a carrier for drug delivery. In this study, we evaluated the toxicity of the liposome containing the inclusion complex and the magnetic fluid (CB: ZnPc-MLP) in the presence of magnetic field and light. This result shows that the application of light and magnetic field in combination are able to be more effective than the same applied separately, demonstrating the synergistic effect.
 
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Publishing Date
2013-03-26
 
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