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Mucin Inhibition of Lymphocyte Function does not Require Specific Mucin‐Ligand Interactions

Mucins are large highly glycosylated molecules that have been postulated to interfere with certain cell-cell interactions. Steric, charge and specific signalling effects have been postulated for the inhibition by cell-surface mucin molecules. In this report we evaluate the inhibitory effects of bovine submaxillary mucin (BSM), a mucin without specific lymphocyte interactions, on lymphocyte function. BSM inhibits the adhesion of lymphocytes when coimmobilized with intercellular adhesion molecule-1 (ICAM-1) and blocks the activation of T lymphocytes when coimmobilized with anti-CD3. These data demonstrate a general mucin effect on lymphocyte adhesion and activation that is primarily steric in nature and implicates mucins as general barriers to lymphocyte-tumour cell interactions. Mucin blockade of cell-cell interactions may explain why mucinous tumours are often associated with a poor prognosis.