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CD99 type II is a determining factor for the differentiation of primitive neuroectodermal cells
Eun Jung Lee1, Hyun Gyu Lee, Sung Hye Park
1Department of Pathology, College of Medicine, Seoul National University, Seoul, Korea.
Experimental & Molecular Medicine
|December 4, 2003
Summary
The CD99 molecule influences cell behavior. CD99 type II acts as a negative regulator in neural differentiation, impacting nerve system development.
Area of Science:
- Cell Biology
- Neuroscience
- Immunology
Background:
- CD99 is a cell surface molecule involved in cell adhesion and activation.
- Two subtypes, CD99 type I and type II, have been identified.
- CD99 is expressed on various immune cells and somatic cells.
Purpose of the Study:
- To investigate the correlation between neural differentiation and CD99 subtype expression.
- To determine the role of CD99 subtypes in neural precursor cell differentiation.
Main Methods:
- Studied CD99 subtype expression in three differentiated cell lines (CADO-ES1, RD-ES, SH-N-SY5Y).
- Induced neural differentiation in RD-ES cells using N6,2'-dibutyryl-cAMP (db-cAMP).
- Transfected RD-ES cells with cDNA for CD99 type I-GFP and CD99 type II-GFP.
Main Results:
- Neural differentiation led to down-regulation of CD99 type II, while CD99 type I remained constant.
- RD-ES cells treated with db-cAMP exhibited neurite formation and reduced CD99 type II expression.
- Transfection with CD99 type II-GFP prevented neural differentiation in RD-ES cells.
Conclusions:
- CD99 type II expression is inversely correlated with neural differentiation.
- CD99 type II functions as a negative regulator in the neural differentiation of precursor cells.
- Findings suggest a role for CD99 type II in nerve system development.