Comparative distribution of human and avian type sialic acid influenza receptors in the pig.

BMC Veterinary Research
Rahul NelliKin-Chow Chang

Abstract

A major determinant of influenza infection is the presence of virus receptors on susceptible host cells to which the viral haemagglutinin is able to bind. Avian viruses preferentially bind to sialic acid alpha2,3-galactose (SAalpha2,3-Gal) linked receptors, whereas human strains bind to sialic acid alpha2,6-galactose (SAalpha2,6-Gal) linked receptors. To date, there has been no detailed account published on the distribution of SA receptors in the pig, a model host that is susceptible to avian and human influenza subtypes, thus with potential for virus reassortment. We examined the relative expression and spatial distribution of SAalpha2,3-GalG(1-3)GalNAc and SAalpha2,6-Gal receptors in the major organs from normal post-weaned pigs by binding with lectins Maackia amurensis agglutinins (MAA II) and Sambucus nigra agglutinin (SNA) respectively. Both SAalpha2,3-Gal and SAalpha2,6-Gal receptors were extensively detected in the major porcine organs examined (trachea, lung, liver, kidney, spleen, heart, skeletal muscle, cerebrum, small intestine and colon). Furthermore, distribution of both SA receptors in the pig respiratory tract closely resembled the published data of the human tract. Similar expression patterns of SA receptors bet...Continue Reading

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Methods Mentioned

BETA
confocal microscopy

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