In the present study, we report the sequences and characterization of the porcine
integrin cDNAs encoding alphav, beta3, beta6 and beta8 subunits and compare them to
those of other species. The coding sequences for the porcine alphav, beta3, beta6
and beta8 subunits were found to be 3141, 2289, 2367 and 2304 nucleotides in length,
encoding 1046, 762, 788 and 767-amino-acid-residue protein, respectively. The porcine
integrin alphav, beta3, beta6 and beta8 subunit shares common structural and functional
elements with their counterparts from the other species. Phylogenetic trees showed
that the porcine alphav, beta3, beta6 and beta8 were clustered into the Artiodactyla
group, together with those of camels, sheep, and cattle, that are susceptible to FMDV
infection. Real-time RT-PCR was used to investigate expression of the integrins alphavbeta3,
alphavbeta6 and alphavbeta8 in different tissues of pigs in order to determine the
role of these receptors in tissue tropism. Expression analysis showed that alphavbeta6
and alphavbeta8 mRNA expression were detected at high levels in tissues known to support
replication of FMDV. Tissue distribution pattern of alphavbeta3 mRNA seems to be unrelated
to the known tissue tropism of FMDV. This study provided the first data of porcine
integrins for the further studies of the FMDV pathogenesis in pigs.
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