AVALIAÇÃO DOS EFEITOS DE NANOTUBOS DE CARBONO DE PAREDE MÚLTIPLA CARBOXILADOS EM CÉLULAS DO SISTEMA IMUNOLÓGICO

• Ano de defesa: 2010
• Autor(a) principal: Barbosa, Gabriela de Moraes
• Orientador(a): Rodrigues Junior, Luiz Carlos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Franciscana
• Programa de Pós-Graduação: Mestrado Acadêmico em Nanociências
• Departamento: Biociências e Nanomateriais
• País: BR
• Palavras-chave em Português: Nanotubos de carbono; esplenócitos; adjuvante; proliferação celular; linfócitos
• Palavras-chave em Inglês: carbon nanotubes; splenocytes; adjuvants; cell proliferation; lymphocytes
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS
• Link de acesso: http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/254; http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/340

The carbon nanotubes (CNTs) display exclusive properties which are of great interest to biotechnology area. The idea of utilizing CTNs as drug carriers, adjuvant for vaccines and biosensors is attracting much interest from scientific community. However, biocompatibility and toxicity in vitro and in vivo of these structures need to be investigated. The aim of this study was to determine the effects of functionalized multiwalled carbon nanotubes (MWCNTs) on cells of the immune system. For in vitro test, splenocytes and bone marrow cells were isolated from BALB/c female mice. The group of treated cells was cultured with carboxylic MWCNTs suspensions at different concentrations (1, 5 or 10 ng/mL), while the control group was only cultured with medium RMPI 1640 and 10% fetal calf serum (FCS). After 24, 48 and 72 hours of cultivation, the viability proliferation and interaction were analyzed by transmission electron microscopy (TEM) analysis of carboxylic MWCNTs with cells. In vivo study, carboxylic MWCNTs were administered intravenously with a concentration of 50 and 100 &#956;g. After 24 hours, splenocytes were isolated, labeled with anti-CD3+ and anti- B220+ antibodies and analyzed by Fluorescence Activated Cell Sorting (FACS). Total IgG production was determined in mice serum after 20 days of administration. The results showed no significant difference (p < 0.05) in the cell viability test of splenocytes, although it has been observed an increase in the frequency of cells directly proportional to the concentrations of carboxylic MWCNTs suspensions in the period of 48 hours. For marrow cells it was observed an inversion in the frequency of cells in the periods of 24 and 48 hours. Regarding the proliferation of splenocytes, groups of cells treated with carboxylic MWCNTs showed significant difference (p<0.05) when compared to control positive group (CpG oligonucleotide). In the analyses performed by TEM, it was not found any type of interaction of carboxylic MWCNTs with splenocytes treated with carboxylic MWCNTs in the concentration of 10 ng/mL. According to the analyses carried out by flow cytometry, the percentage of CD3+ cells and B220+ cells showed no significant difference in relation to the control group. In Enzyme Immunoassay (ELISA), the total IgG antibody production did not increase in the serum of mice treated with carboxylic MWCNTs when compared to control. Thus, the results in vitro and in vivo indicate that carboxylic MWCNTs did not present stimulatory effects on cells of the immune system and, at the same conditions, no cellular toxicity.