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Porcine sialoadhesin (pSn; a sialic acid-binding lectin) and porcine CD163 (pCD163) are molecules that facilitate infectious entry of porcine reproductive and respiratory syndrome virus (PRRSV) into alveolar macrophages. In this study, it was shown that murine Sn (mSn) and human Sn (hSn), like pSn, can promote PRRSV infection of pCD163-expressing cells. Intact sialic acid-binding domains are crucial, since non-sialic acid-binding mutants of pSn, mSn and hSn did not promote infection. Endodomain-deletion mutants of pSn, mSn and hSn promoted PRRSV infection less efficiently, but also showed markedly reduced expression levels, making further research into the potential role of the Sn endodomain in PRRSV receptor activity necessary. These data further complement our knowledge on Sn as an important PRRSV receptor, and suggest - in combination with other published data - that species differences in the main PRRSV entry mediators Sn and CD163 do not account for the strict host species specificity displayed by the virus.

Porcine, murine and human sialoadhesin (Sn/Siglec-1/CD169): portals for porcine reproductive and respiratory syndrome virus entry into target cells