Publication: Localization of influenza virus sialoreceptors in equine respiratory tract
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Date
2008
Authors
Scocco, Paola ; Pedini, Vera
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
This study was performed to identify the
equine respiratory tract areas which express the specific
receptor for equine influenza virus; findings may be
useful to provide new ways to treat the infectious
disease. The present work aims to visualize in situ the
presence of sialoderivatives in the horse respiratory tract
in order to localize sialoderivatives acting as influenza
virus receptors. To this purpose, nasal mucosae, trachea,
bronchus and lung parenchyma were removed from 8
mature horses of both sexes. We performed sialic acid
characterization by means of mild and strong periodate
oxidation and saponification, combined with lectin
histochemistry and sialidase digestion, in addition to the
direct evidentiation of sialic acid residues. No
differences were shown between sexes. Sialic acid
residues are present in the nasal mucous cell secretion,
where they are linked to galactose by means of a2-3
linkage and are mainly C9 acetylated, and in the nasal
and tracheal epithelial lining, where they are represented
by periodate labile residues (a2-3)- and/or (a2-6)-
linked to galactose. Specific receptors for equine
influenza viruses are present at the nasal and tracheal
epithelial lining cell coat levels, and in some trachea
epithelial cells, but the horse possesses a preventive defence, which consists of the secretion of a mucous
layer at nasal level, which could specifically inactivate
the hemagglutinins of equine influenza virus; in
addition, it expresses other sialoreceptors which can
mask the influenza specific ones.
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