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The liberation of CD44
1Jagiellonian University, Faculty of Biotechnology, 30-387 Kraków, Poland. Cichy@mol.uj.edu
The Journal of Cell Biology
|June 11, 2003
Summary
CD44, a transmembrane receptor, has diverse roles beyond adhesion, including inflammation and cancer. New research reveals its functional fragments and three distinct phases: transmembrane, matrix-bound, and soluble, impacting cell behavior.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- CD44 was initially recognized as a transmembrane adhesion molecule involved in hyaluronan metabolism.
- Recent research has expanded the known functions of CD44 to include roles in inflammatory cell function, tumor growth, and metastasis.
- Posttranslational modifications of CD44 are critical in regulating its ligand-binding affinity.
Purpose of the Study:
- To review emerging evidence on functional fragments of CD44.
- To explore the liberation of CD44 fragments by enzymatic modification.
- To propose a model of CD44 existing in three distinct functional phases.
Main Methods:
- Literature review focusing on recent investigations of CD44.
- Analysis of evidence regarding enzymatic modification of CD44.
- Synthesis of findings to propose a novel model for CD44 function.
Main Results:
- CD44 exhibits functions beyond its role as a transmembrane receptor.
- Functional fragments of both the cytoplasmic and ectodomains of CD44 can be generated.
- Evidence suggests CD44 exists in three phases: transmembrane receptor, matrix component, and soluble protein.
Conclusions:
- CD44 functions extend beyond its traditional role, involving distinct phases with shared and unique biological activities.
- Posttranslational processing of CD44 is a key mechanism regulating its diverse functions and cell behavior.
- CD44 serves as a model for understanding how posttranslational modifications influence cellular processes.