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Mucin gene structure and expression: protection vs. adhesion
B J Van Klinken1, J Dekker, H A Büller
1Academic Medical Center, Amsterdam, The Netherlands.
The American Journal of Physiology
|November 1, 1995
Summary
Mucins, proteins with extensive O-glycosylation, serve dual roles in cell protection and adhesion. Cloning mucin cDNAs advances understanding of these epithelial and leukocyte-associated molecules.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Mucins are large glycoproteins with diverse biological functions.
- Two main classes exist: epithelium-associated and endothelium/leukocyte-associated mucins.
- Their structure, characterized by extensive O-glycosylation, results in a filamentous conformation.
Purpose of the Study:
- To describe two distinct classes of mucins: epithelium-associated and endothelium/leukocyte-associated.
- To elucidate the dual role of mucins as protective barriers and adhesion molecules.
- To highlight the significance of mucin cDNA cloning in understanding their structure and function.
Main Methods:
- Application of molecular biology techniques.
- Molecular analyses of mucin cDNAs.
- Literature review and synthesis of existing data.
Main Results:
- Epithelial mucins are primarily involved in cytoprotection.
- Endothelial and leukocyte mucins function as adhesion molecules in immune responses (lymphocyte homing, activation, inflammation).
- Mucins' filamentous structure, due to O-glycosylation, enables barrier formation but can be overridden by specific cell receptors.
Conclusions:
- Mucin cDNA cloning is crucial for understanding mucin structure and function.
- Mucins exhibit a dual nature, acting as both protective barriers and mediators of cell adhesion.
- The distinct roles of epithelial and endothelial/leukocyte mucins are highlighted, emphasizing their importance in cellular processes and disease initiation.