RESUMO
Objective To investigate the association between CHI3L1 polymorphism and asthma in the Han population of Guangdong,and to explore the clinical values of chitinase-like protein YKL-40 in evaluating disease severity and monitoring the progression of the disease.Methods Total 251 objects were divided into asthma group (n=150)and control group(n=101).The single nucleotide polymorphism (SNP)at CHI3L1 gene was detected with Massarray method. The serum YKL-40 levels, total IgE levels, peripheral blood eosinophil percentage (Eos%)of the obj ects in asthma and control groups were detected. The asthma patients were divied into asthma exacergation group and stable group,and the serum YKL-40 levels were compared.Results The distribution of A/G at rs3806448 of CHI3L1 had significant difference between asthma and control groups (P<0.01 ), and the frequency of A allele at rs3806448 of the patients in asthma group was significantly higher than that in control group (OR= 1.93,95% CI=1.30-2.62,χ2=11.6,P<0.01).The serum YKL-40 levels,total IgE and Eos% of the patients with AA at rs3806448 were higher than those of the patients with GG or AG at rs3806448 (P<0.05);the FEV1% of the patients with AA was lower than those of the patients with GG or AG at rs3806448(P<0.01). The serum YKL-40 level of the patients in asthma group was significantly higher than that in normal control group (P<0.01),and the serum YKL-40 level of the patients in asthma exacergation group was higher than those in asthma stable group and normal control group(P<0.01).The serum YKL-40 level of the patients in asthma group was positively correlated with the peripheral blood Eos% and total IgE level(rEos=0.348,rIgE=0.437,P<0.01), and was negatively correlated with the lung function(r=-0.745,P<0.01). Conclusion The polymorphism of CHI3L1-rs3806448 may correlate with asthma of Han population in Guangdong area.The serum YKL-40 may be a new biomarker to evaluate asthma disease severity and helpful for monitoring illness stage.
RESUMO
At present ,the mechanism of highly pathogenic avian influenza H5N1 virus causing human infection or death is still not fully clear .In order to better understand the pathogenesis of the disease ,the rhesus macaques were infected with H5N1 virus (AF148678/ACGoose/Guangdong/11961H5N1) .We analyzed the clinical symptoms ,characteristics of the virus invades body ,pathological changes ,and immune response to discuss the pathogenesis of viral pneumonia induced by H 5N1 virus infection from the early time to the recovery time .The rhesus macaques were infected with H5N1 virus through nasal .Clinical signs were assessed daily ,and major organs and blood were collected for detection of blood routine analysis ,viruses were isola-ted and titrated from organs ,and pathologic and immunohistochemical were also conducted .As a result ,the rhesus macaques in-fected with H5N1 virus experienced fever ,dyspnea ,and anorexia .The respiratory tract was the major target of the virus and the virus could not replicate in organs outside the respiratory tract .Positive staining cells by immunohistochemistry were bronchial epithelial cells and alveolar macrophages .Rhesus macaques experienced temporary severe pneumonia after 1-3 days ,mainly be-cause of neutrophils infiltration ;gradual recovery 6 days later ,mainly with macrophage infiltration ;lung tissue presented recov-ery state after 14 days ,mainly with T lymphocytes infiltration .Finally ,we concluded that the predilection of the H 5N1 virus to infect the lower airway suggests that it may be a limiting factor in human-to-human transmissibility of the H5N1 virus .The pathogenesis may include virus invasion ,replication and immune injury .