Efeitos da natação sobre os parâmetros morfofuncionais e imunológicos em um modelo murino de inflamação pulmonar induzido pelo alérgeno recombinante Blo t 5 do ácaro Blomia tropicalis

Abstract

Experimental models for lung inflammation have been commonly used to understand the pathophysiology of the inflammatory lung diseases. For the first time, we developed an experimental model of lung inflammation using the recombinant Blo t 5 protein (rBlo t 5) from the mite Blomia tropicalis, in order to analysis the effects promoted by swimming (TA) at moderate intensity in this model. The Blo t 5 sequence was cloned in pET28a vector and used to transform BL21 E. coli strain, and it was purified in a nickel affinity chromatography. Then, BALB/c mice were sensitized two times with 25 μg recombinant protein (i.p.) and 5 μg (i.n.) at intervals of 7 days, followed by four daily intranasally instillations, and submitted to swimming for 4 weeks. The tidal volume, respiratory frequency, volume-minute, levels of specific IgG antibodies and IgG subclasses (IgG1 and IgG2a), cytokines and lactate from blood were evaluated. We found an increase in tidal volume (p<0,001) after exposure to high concentrations of methacholine and increased levels of total IgG anti-rBlo t 5 (p<0.0001) and their subclasses in rBLOT5 group, with a decrease in these parameters in rBLOT5-TA group. There was a decrease in total cells (p<0,0001) and in the proinflammatory cytokines levels, like IL-6 (p<0,01), IFN-γ (p<0,05) and TNF (p<0,01) in rBLOT5-TA group. We can conclude that aerobic exercise, even at moderate intensity, is indicated for attenuation of pulmonary inflammatory process in lung diseases.