Comparative studies of mucosal humoral and cellular immune responses to  2009 pandemic H1N1 influenza virus in mice.

Comparative studies of mucosal humoral and cellular immune responses to 2009 pandemic H1N1 influenza virus in mice. Acta Virol. 2019;63(2):203-210 Authors: Zhang YY, An J, Wang K, Han B, Liu YF, Jia HL, Li YS, Lei L, Jia N, Lv J Abstract The nasal-associated lymphoid tissues (NALTs), embedded in the submucosa of murine upper respiratory tract, represents an important site of induction for local mucosal immune responses to airborne pathogens and intranasal vaccines. Here, we systematically investigated the mucosal humoral and cellular immune responses of NALTs in mice infected with A/Beijing/501/2009 (BJ501) and A/Puerto Rico/8/1934 (PR8) viruses. Compared with PR8 infection, BJ501 induced a more rapid increase of virus-specific IgA and IgG antibodies in the nasal lavage fluid and a higher ratio of IgG1/IgG2a, indicating a stronger Th2 response to BJ501 in mucosal immunity. In addition, using virus-specific enzyme-linked immunospot assay (ELISpot assay), we observed higher and earlier responses of virus-specific IgA and IgG antibody-secreting cells (ASCs) and IFN-γ and IL-4 cytokine-secreting cells (CSCs) in NALTs of mice intranasally infected with BJ501 virus. In particular, the frequency of BJ501-specific IFN-γ-CSCs significantly correlated with the kinetics of BJ501 virus load in NALTs, suggesting an important role of IFN-γ-CSCs-associated mucosal cellular immune responses in BJ501 virus clearance. Collectively, BJ501 induced a...
Source: Acta Virologica - Category: Infectious Diseases Authors: Tags: Acta Virol Source Type: research