RESUMO
We explored whether nanoformulation of curcumin can cause better protective effect than free curcumin against arsenic-induced genotoxicity. Curcumin-loaded Poly(lactic-co-glycolic acid) nanoparticles (CUR-NP) were prepared by emulsion technique. The CUR-NP were water soluble and showed biphasic release pattern. Rats were divided into 5 groups of 6 each. Group I served as the control. Group II rats were exposed to sodium arsenite (25 ppm) daily through drinking water for 42 days. Groups III, IV and V were maintained as in Group II, however, they were also administered empty nanoparticle, curcumin (100 mg/kg bw) and CUR-NP (100 mg/kg bw), respectively, by oral gavage during the last 14 days of arsenic exposure. On the 43rd day, genotoxic effects were evaluated in bone marrow cells. Arsenic increased chromosomal aberrations, micronuclei formation and DNA damage. Both free curcumin and CUR-NP attenuated these arsenic-mediated genotoxic effects. However, the result suggests that nanoformulation have better protective effect than free curcumin at the same dose level.
Assuntos
Arsenitos/toxicidade , Curcumina/farmacologia , Dano ao DNA/efeitos dos fármacos , Nanopartículas/uso terapêutico , Compostos de Sódio/toxicidade , Análise de Variância , Animais , Células da Medula Óssea/metabolismo , Aberrações Cromossômicas/efeitos dos fármacos , Ensaio Cometa , Curcumina/química , Curcumina/uso terapêutico , Ácido Láctico/química , Ácido Láctico/uso terapêutico , Micronúcleos com Defeito Cromossômico/efeitos dos fármacos , Estrutura Molecular , Nanopartículas/química , Ácido Poliglicólico/química , Ácido Poliglicólico/uso terapêutico , Copolímero de Ácido Poliláctico e Ácido Poliglicólico , RatosRESUMO
A DNA vaccine for foot and mouth disease (FMD) based on mannosylated chitosan nanoparticles was evaluated in guinea pigs. The DNA construct was comprised of FMD virus full length-VP1 gene and outer membrane protein A (Omp A) gene of Salmonella typhimurium as a Toll-like receptor (TLR)-ligand in pVAC vector. Groups of guinea pigs immunized either intramuscularly or intra-nasally were evaluated for induction of virus neutralizing antibodies, Th1(IgG2) and Th2 (IgG1) responses, lymphocyte proliferation, reactive nitrogen intermediate production, secretory IgA for naso-mucosal immune response and protection upon homotypic type O virulent FMD virus challenge. The results indicate the synergistic effect of OmpA on the immunogenic potential of FMD DNA vaccine construct delivered using mannosylated chitosan nano-particles by different routes of administration. These observations suggest the substantial improvement in all the immunological parameters with enhanced protection in guinea pigs.