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2017 ; 18
(9
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Modulation of Immunogenicity and Conformation of HA1 Subunit of Influenza A Virus
H1/N1 Hemagglutinin in Tubular Immunostimulating Complexes
#MMPMID28869526
Sanina N
; Davydova L
; Chopenko N
; Kostetsky E
; Shnyrov V
Int J Mol Sci
2017[Sep]; 18
(9
): ä PMID28869526
show ga
The HA1 subunit of the influenza virus hemagglutinin (HA) is a valuable antigen
for the development of vaccines against flu due to the availability of most
antigenic sites which are conformational. Therefore, a novel adjuvanted antigen
delivery system, tubular immunostimulating complexes (TI-complexes) comprising
monogalactosyldiacylglycerol (MGDG) from different marine macrophytes as a lipid
matrix for an antigen, was applied to enhance the immunogenicity of recombinant
HA1 of influenza A H1N1 and to study the relation between its immunogenicity and
conformation. The content of anti-HA1 antibodies and cytokines was estimated by
ELISA after the immunization of mice with HA1 alone, and HA1 was incorporated in
TI-complexes based on different MGDGs isolated from green algae Ulva lactuca,
brown algae Sargassum pallidum, and seagrass Zostera marina. Conformational
changes of HA1 were estimated by differential scanning calorimetry and intrinsic
fluorescence. It was shown that the adjuvant activity of TI-complexes depends on
the microviscosity of MGDGs, which differently influence the conformation of HA1.
The highest production of anti-HA1 antibodies (compared with the control) was
induced by HA1 incorporated in a TI-complex based on MGDG from S. pallidum, which
provided the relaxation of the spatial structure and, likely, the proper
presentation of the antigen to immunocompetent cells.