副猪嗜血杆菌的分离鉴定及药敏试验

2011年从辽宁省采集以多发性纤维素性浆膜炎为主要特征的病猪肺脏、心包液、血液等病料,通过分离培养、生化试验和PCR检测等方法确认分离到1株副猪嗜血杆菌Hps LN111013,同时应用多种药物对该菌株进行了药物敏感性试验及分析;结果表明该菌株在形态、培养特性和生化试验等方面与国内其他地区所分离到的菌株基本一致,纸片法药敏试验证明本菌对氟苯尼考、头孢噻呋、洛美沙星最为敏感。本研究为进一步确认辽宁省副猪嗜血杆菌流行菌株的血清型和基因型,查明其传染来源和遗传变异情况奠定了基础,为制定辽宁省副猪嗜血杆菌病防控措施提供依据。     

Nontypeable Hemophilus influenzae induces inflammatory response of bronchial epithelial cells via NF-κB activation and histone deacetylase activity reduction

AIM: To investigate the effect of nontypeable Hemophilus influenzae (NTHi) on the inflammatory response of bronchial epithelial cells, and to preliminarily explore its mechanism. METHODS: The human normal bronchial epithelial BEAS-2B cells were cultured, and the expression levels of interleukin-8 (IL-8) and granulocyte-macrophage colony-stimulating factor (GM-CSF) in the supernatant were measured by ELISA and RT-qPCR after infection with NTHi at MOI=10. The levels of IκBα and the phosphoacetylation of histones were determined by Western blot, and then the expression of histone deacetylase (HDAC) and the enzyme activity of HDAC were detected. The binding activity of NF-κB and IL-8 was measured by electrophoretic mobility shift assay and chromatin immunoprecipitation. Finally, the expression levels of GM-CSF and IL-8 were measured after pretreatment with NF-κB and HDAC inhibitors. RESULTS: The expression levels of IL-8 and GM-CSF in the culture supernatant of BEAS-2B cells were significantly increased (P<0.05) after infection with NTHi at MOI=10. In addition, infection with NTHi significantly down-regulated the expression of cytoplasmic IκBα and enhanced the DNA-binding activity of NF-κB. The phosphoacetylation of histones H3 and H4 and the binding of IL-8 and RNA polymerase II were also significantly increased after infection with NTHi. The expression level and enzyme activity of intracellular HDAC were also significantly reduced (P<0.05) after infection with NTHi. The expression levels of GM-CSF and IL-8 were significantly reduced after pretreatment with NF-κB inhibitor (P<0.05), while the secretion of IL-8 was significantly increased after pretreatment with HDAC inhibitor (P<0.05). CONCLUSION: NTHi inhibits the expression and activity of HDAC by activating the NF-κB signaling pathway, and promotes the secretion of IL-8 and GM-CSF in bronchial epithelial cells, thereby aggravating the inflammatory response.     

猪胸膜肺炎嗜血杆菌血清学调查—2—ME试管凝集试验

应用2巯基乙醇(2—ME)试管凝集反应对1987年由黑龙江省哈尔滨市、齐齐哈尔市、佳木斯市肉联厂及牡丹江地区密山县收集的317头份猪血清进行了猪胸膜肺炎嗜血杆菌(以下简称H.P)抗体检测,阳性反应为38头份(占11.98％),其中H.P1型阳性反应为17头份,H.P4型阳性反应为21头份。抗体滴度最高达1:80。可见,我国猪群中已感染猪胸膜肺炎嗜血杆菌。