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Department of Pathology, National Institute of Infectious Diseases,
Yakult Central Institute for Microbiological Research, and
Institute of Medical Science, University of Tokyo, Tokyo, Japan; and
Research Center for Biologicals, Kitasato Institute, Saitama, Japan
The role of secretory IgA in conferring cross-protective immunity
was examined in polymeric (p)IgR knockout (KO) mice immunized
intranasally with different inactivated vaccines prepared from
A/PR/8/34 (H1N1), A/Yamagata/120/86 (H1N1), A/Beijing/262/95 (H1N1),
and B/Ibaraki/2/85 viruses and infected with the A/PR/8/34 virus in the
upper respiratory tract (RT)-restricting volume. In wild-type mice,
immunization with A/PR/8/34 or its variant (A/Yamagata/120/86 and
A/Beijing/262/95) vaccines conferred complete protection or partial
cross-protection against infection, while the B-type virus vaccine
failed to provide protection. The protection or cross-protection was
accompanied by an increase in the nasal A/PR/8/34
hemagglutinin-reactive IgA concentration, which was estimated to be
>30 times the serum IgA concentration and much higher than the nasal
IgG concentration. In contrast, the blockade of transepithelial
transport of dimeric IgA in pIgR-KO mice reduced the degree of
protection or cross-protection, in parallel with the marked increase in
serum IgA concentration and the decrease in nasal IgA concentration
(
20 and 0.3 times those in wild-type mice, respectively). The
degree of the reduction of protection or cross-protection was
moderately reversed by the low but non-negligible level of nasal IgA,
transudates from the accumulated serum IgA. These results, together
with the absence of the IgA-dependent cross-protection in the lower RT
and the unaltered level of nasal or serum IgG in wild-type and pIgR-KO
mice, confirm that the actively secreted IgA plays an important role in
cross-protection against variant virus infection in the upper RT, which
cannot be substituted by serum IgG.
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