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CD44 expression and modulation on human neuroblastoma tumours and cell lines
European Journal of Cancer (Oxford, England : 1990)
|January 1, 1995
Summary
CD44 standard molecule expression is inversely related to MYCN amplification in neuroblastoma, a cancer of nerve cells. CD44 expression correlates with cell differentiation, not MYCN amplification, and can be modulated by specific agents.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- CD44, a cell surface glycoprotein, plays roles in lymphocyte homing, cell adhesion, and tumor metastasis.
- Alternative splicing of the CD44 gene generates variants involved in conferring metastatic potential to cancer cells.
- Neuroblastoma, a pediatric cancer, exhibits aggressive behavior and metastasis, often associated with MYCN protooncogene amplification.
Purpose of the Study:
- To investigate the relationship between CD44 standard molecule and isoform expression and MYCN amplification in neuroblastoma.
- To determine factors influencing CD44 expression in neuroblastoma, including differentiation and tumorigenic properties.
- To assess the effect of various agents on CD44 expression in neuroblastoma cell lines.
Main Methods:
- Immunohistochemical analysis of CD44 standard molecule expression in neuroblastoma tumor samples across different stages.
- Assessment of CD44 isoform expression in neuroblastoma specimens.
- Culturing and manipulation of neuroblastoma cell lines, including MYCN-expressing transfectants.
- Treatment of neuroblastoma cell lines with differentiation-inducing agents and cytokines/growth factors to evaluate CD44 expression modulation.
Main Results:
- CD44 standard molecule was highly expressed in early-stage neuroblastomas but inversely correlated with MYCN amplification in stage 4 tumors.
- No expression of tested CD44 isoforms was detected in any neuroblastoma specimen.
- CD44 expression in neuroblastoma cell lines was linked to differentiation state and tumorigenicity, not directly to MYCN amplification.
- Retinoic acid, bromodeoxyuridine, and phorbol ester upregulated CD44 expression during differentiation, while cytokines and growth factors had no effect.
Conclusions:
- MYCN amplification in neuroblastoma is associated with a lack of CD44 standard molecule expression, suggesting a role in tumor progression.
- CD44 expression in neuroblastoma is regulated by differentiation and lineage, independent of MYCN amplification.
- CD44 expression can be modulated by differentiation-inducing agents, offering potential therapeutic insights.