tetano
Editor, Senior Moderator
Antiviral Res
. 2024 Jul 8:105960.
doi: 10.1016/j.antiviral.2024.105960. Online ahead of print. Cold-adapted influenza vaccine carrying three repeats of a respiratory syncytial virus (RSV) fusion glycoprotein epitope site protects BALB/c mice and cotton rats against RSV infection
Yongru Xu[SUP] 1 [/SUP], Fang Sun[SUP] 2 [/SUP], Zhengran Chuai[SUP] 3 [/SUP], Junyun Wang[SUP] 4 [/SUP], Zhifang Bai[SUP] 3 [/SUP], Chengrong Bian[SUP] 3 [/SUP], Xiliang Wang[SUP] 5 [/SUP], Zhongpeng Zhao[SUP] 5 [/SUP], Yongzhuang Liu[SUP] 6 [/SUP], Penghui Yang[SUP] 7 [/SUP]
Affiliations
Respiratory syncytial virus is the major cause of respiratory viral infections, particularly in infants, immunocompromised populations, and the elderly (over 65 years old), the prevention of RSV infection has become a priority. In this study, we generated a chimeric influenza virus, termed LAIV/RSV/HA-3F, using reverse genetics technology which contained three repeats of the RSV fusion protein neutralizing epitope site II to the N terminal in the background of the hemagglutinin (HA) gene of cold adapted influenza vaccine A/California/7/2009 ca. LAIV/RSV/HA-3F exhibited cold-adapted (ca) and attenuated (att) phenotype. BALB/c mice immunized intranasally with LAIV/RSV/HA-3F showed robust immunogenicity, inducing viral-specific antibody responses against both influenza and RSV, eliciting RSV-specific humoral, cellular and mucosal immune responses. LAIV/RSV/HA-3F also conferred protection as indicated by reduced viral titers and improved lung histopathological alterations against live RSV virus challenge. Mechanismly, single-cell RNA sequencing (scRNA-seq) and single-cell T cell antigen receptor (TCR) sequencing were employed to characterize the immune responses triggered by chimeric RSV vaccine, displaying that LAIV/RSV/HA-3F provided protection mainly via interferon-γ (IFN-γ). Moreover, we found that LAIV/RSV/HA-3F significantly inhibited viral replication in the challenged mouse lung and protected against subsequent RSV challenge in cotton rats without causing lung disease. Taken together, our findings demonstrated that LAIV/RSV/HA-3F has potential as a promising bivalent vaccine with dual purpose candidate for the prevention of influenza and RSV, and preclinical and clinical studies warrant further investigations.
Keywords: RSV vaccine; fusion glycoprotein; intranasal immunization; live attenuated influenza virus; respiratory syncytial virus.
. 2024 Jul 8:105960.
doi: 10.1016/j.antiviral.2024.105960. Online ahead of print. Cold-adapted influenza vaccine carrying three repeats of a respiratory syncytial virus (RSV) fusion glycoprotein epitope site protects BALB/c mice and cotton rats against RSV infection
Yongru Xu[SUP] 1 [/SUP], Fang Sun[SUP] 2 [/SUP], Zhengran Chuai[SUP] 3 [/SUP], Junyun Wang[SUP] 4 [/SUP], Zhifang Bai[SUP] 3 [/SUP], Chengrong Bian[SUP] 3 [/SUP], Xiliang Wang[SUP] 5 [/SUP], Zhongpeng Zhao[SUP] 5 [/SUP], Yongzhuang Liu[SUP] 6 [/SUP], Penghui Yang[SUP] 7 [/SUP]
Affiliations
- PMID: 38986872
- DOI: 10.1016/j.antiviral.2024.105960
Respiratory syncytial virus is the major cause of respiratory viral infections, particularly in infants, immunocompromised populations, and the elderly (over 65 years old), the prevention of RSV infection has become a priority. In this study, we generated a chimeric influenza virus, termed LAIV/RSV/HA-3F, using reverse genetics technology which contained three repeats of the RSV fusion protein neutralizing epitope site II to the N terminal in the background of the hemagglutinin (HA) gene of cold adapted influenza vaccine A/California/7/2009 ca. LAIV/RSV/HA-3F exhibited cold-adapted (ca) and attenuated (att) phenotype. BALB/c mice immunized intranasally with LAIV/RSV/HA-3F showed robust immunogenicity, inducing viral-specific antibody responses against both influenza and RSV, eliciting RSV-specific humoral, cellular and mucosal immune responses. LAIV/RSV/HA-3F also conferred protection as indicated by reduced viral titers and improved lung histopathological alterations against live RSV virus challenge. Mechanismly, single-cell RNA sequencing (scRNA-seq) and single-cell T cell antigen receptor (TCR) sequencing were employed to characterize the immune responses triggered by chimeric RSV vaccine, displaying that LAIV/RSV/HA-3F provided protection mainly via interferon-γ (IFN-γ). Moreover, we found that LAIV/RSV/HA-3F significantly inhibited viral replication in the challenged mouse lung and protected against subsequent RSV challenge in cotton rats without causing lung disease. Taken together, our findings demonstrated that LAIV/RSV/HA-3F has potential as a promising bivalent vaccine with dual purpose candidate for the prevention of influenza and RSV, and preclinical and clinical studies warrant further investigations.
Keywords: RSV vaccine; fusion glycoprotein; intranasal immunization; live attenuated influenza virus; respiratory syncytial virus.