H7N9禽流感病毒(AIV)感染人类的情况最先出现在中国,而且具有很高的突变性。2013年首次在人类身上分离出的是低致病性H7N9禽流感病毒,发展到2017年,已经出现高致病性H7N9禽流感病毒,严重威胁动物和人类的生命健康安全,同时,还会对社会...H7N9禽流感病毒(AIV)感染人类的情况最先出现在中国,而且具有很高的突变性。2013年首次在人类身上分离出的是低致病性H7N9禽流感病毒,发展到2017年,已经出现高致病性H7N9禽流感病毒,严重威胁动物和人类的生命健康安全,同时,还会对社会的稳定和经济发展有一定的影响。综述通过NCBI(National Center for Biotechnology Information)和GISAID数据库收集了中国国内2001~2021年共4641条有关H7N9的数据,拟通过流行病学的角度来说明H7N9禽流感病毒在中国的发生、发展以及在时间、空间和种群间的分布情况,同时总结中国对H7N9所引起的大流行所采取的防控措施,以期为后续的疫情防控措施规划提供依据。展开更多
H7N9 subtype avian influenza virus poses a great challenge for poultry industry.Newcastle disease virus(NDV)-vectored H7N9 avian influenza vaccines(NDV_(vec)H7N9)are effective in disease control because they are prote...H7N9 subtype avian influenza virus poses a great challenge for poultry industry.Newcastle disease virus(NDV)-vectored H7N9 avian influenza vaccines(NDV_(vec)H7N9)are effective in disease control because they are protective and allow mass administration.Of note,these vaccines elicit undetectable H7N9-specific hemagglutination-inhibition(HI)but high IgG antibodies in chickens.However,the molecular basis and protective mechanism underlying this particular antibody immunity remain unclear.Herein,immunization with an NDV_(vec)H7N9 induced low anti-H7N9 HI and virus neutralization titers but high levels of hemagglutinin(HA)-binding IgG antibodies in chickens.Three residues(S150,G151 and S152)in HA of H7N9 virus were identified as the dominant epitopes recognized by the NDV_(vec)H7N9 immune serum.Passively transferred NDV_(vec)H7N9 immune serum conferred complete protection against H7N9 virus infection in chickens.The NDV_(vec)H7N9 immune serum can mediate a potent lysis of HA-expressing and H7N9 virus-infected cells and significantly suppress H7N9 virus infectivity.These activities of the serum were significantly impaired after heat-inactivation or treatment with complement inhibitor,suggesting the engagement of the complement system.Moreover,mutations in the 150-SGS-152 sites in HA resulted in significant reductions in cell lysis and virus neutralization mediated by the NDV_(vec)H7N9 immune serum,indicating the requirement of antibody-antigen binding for complement activity.Therefore,antibodies induced by the NDV_(vec)H7N9 can activate antibody-dependent complement-mediated lysis of H7N9 virus-infected cells and complement-mediated neutralization of H7N9 virus.Our findings unveiled a novel role of the complement in protection conferred by the NDV_(vec)H7N9,highlighting a potential benefit of engaging the complement system in H7N9 vaccine design.展开更多
文摘H7N9禽流感病毒(AIV)感染人类的情况最先出现在中国,而且具有很高的突变性。2013年首次在人类身上分离出的是低致病性H7N9禽流感病毒,发展到2017年,已经出现高致病性H7N9禽流感病毒,严重威胁动物和人类的生命健康安全,同时,还会对社会的稳定和经济发展有一定的影响。综述通过NCBI(National Center for Biotechnology Information)和GISAID数据库收集了中国国内2001~2021年共4641条有关H7N9的数据,拟通过流行病学的角度来说明H7N9禽流感病毒在中国的发生、发展以及在时间、空间和种群间的分布情况,同时总结中国对H7N9所引起的大流行所采取的防控措施,以期为后续的疫情防控措施规划提供依据。
基金supported by the earmarked fund for China Agriculture Research System(CARS-40)the Key Research and Development Project of Yangzhou(Modern Agriculture),China(YZ2022052)the‘‘High-end Talent Support Program’’of Yangzhou University,China。
文摘H7N9 subtype avian influenza virus poses a great challenge for poultry industry.Newcastle disease virus(NDV)-vectored H7N9 avian influenza vaccines(NDV_(vec)H7N9)are effective in disease control because they are protective and allow mass administration.Of note,these vaccines elicit undetectable H7N9-specific hemagglutination-inhibition(HI)but high IgG antibodies in chickens.However,the molecular basis and protective mechanism underlying this particular antibody immunity remain unclear.Herein,immunization with an NDV_(vec)H7N9 induced low anti-H7N9 HI and virus neutralization titers but high levels of hemagglutinin(HA)-binding IgG antibodies in chickens.Three residues(S150,G151 and S152)in HA of H7N9 virus were identified as the dominant epitopes recognized by the NDV_(vec)H7N9 immune serum.Passively transferred NDV_(vec)H7N9 immune serum conferred complete protection against H7N9 virus infection in chickens.The NDV_(vec)H7N9 immune serum can mediate a potent lysis of HA-expressing and H7N9 virus-infected cells and significantly suppress H7N9 virus infectivity.These activities of the serum were significantly impaired after heat-inactivation or treatment with complement inhibitor,suggesting the engagement of the complement system.Moreover,mutations in the 150-SGS-152 sites in HA resulted in significant reductions in cell lysis and virus neutralization mediated by the NDV_(vec)H7N9 immune serum,indicating the requirement of antibody-antigen binding for complement activity.Therefore,antibodies induced by the NDV_(vec)H7N9 can activate antibody-dependent complement-mediated lysis of H7N9 virus-infected cells and complement-mediated neutralization of H7N9 virus.Our findings unveiled a novel role of the complement in protection conferred by the NDV_(vec)H7N9,highlighting a potential benefit of engaging the complement system in H7N9 vaccine design.
