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Mucin inhibition of lymphocyte function does not require specific mucin-ligand interactions
K P O'Boyle1, T Chen, S Kozlowski
1Division of Monoclonal Ab, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892, USA.
Scandinavian Journal of Immunology
|July 8, 2000
Summary
Mucins, large molecules on cell surfaces, act as physical barriers, inhibiting lymphocyte adhesion and T-cell activation. This mucin effect may explain poor prognosis in mucinous tumors.
Area of Science:
- Immunology
- Biochemistry
- Cell Biology
Background:
- Cell-surface mucins are large, highly glycosylated molecules implicated in modulating cell-cell interactions.
- Previous hypotheses suggested steric, charge, or signaling mechanisms for mucin-mediated inhibition.
Purpose of the Study:
- To investigate the inhibitory effects of bovine submaxillary mucin (BSM) on lymphocyte function.
- To determine if mucins exert a general inhibitory effect on lymphocyte adhesion and activation.
Main Methods:
- Co-immobilization of BSM with intercellular adhesion molecule-1 (ICAM-1) to assess lymphocyte adhesion.
- Co-immobilization of BSM with anti-CD3 antibodies to evaluate T lymphocyte activation.
Main Results:
- BSM significantly inhibited lymphocyte adhesion when co-immobilized with ICAM-1.
- BSM blocked T lymphocyte activation when co-immobilized with anti-CD3.
- The observed inhibition was primarily attributed to steric hindrance.
Conclusions:
- Mucins exert a general inhibitory effect on lymphocyte adhesion and activation, mainly through steric mechanisms.
- Mucins function as barriers to lymphocyte-tumor cell interactions.
- Mucin blockade of cell-cell interactions may contribute to the poor prognosis observed in mucinous tumors.