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Updated: Jun 26, 2026
A Unified Methodological Framework for Vestibular Schwannoma Research
Published on: June 20, 2017
[Expression of S518 phosphorylated Merlin and its interaction with CD44 in vestibular schwannoma]
Li-hui Cai1, Hao Wu, Jing-rong Lü
1Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Jiaotong University, Shanghai 200092, China.
Objective:
To investigate the impact of S518 phosphorylation in Merlin on the interaction with CD44 in vestibular schwannoma and the tumor growth.
Methods:
Thirty-five samples of vestibular schwannoma were identified by pathology. Immunohistopathology and western blot were employed to analyze the expression and localization of S518 phosphorylated Merlin in the tumor tissues. Nerve tissues that were collected during other surgical operation were used as control. The expression level of S518 phosphorylated Merlin was compared with clinical stages, tumor size, clinical course and cystic degeneration. Immunoprecipitation was used to evaluate the impact of S518 phosphorylation in Merlin on the interaction with CD44.
Results:
In vestibular schwannoma, Merlin was phosphorylated at S518 and demonstrated perinuclear localization. The S518 phosphorylation level was much lower in the normal control nerve tissues than that in vestibular schwannoma tissues. There was no correlation between the phosphorylation level on Merlin and clinical stages, tumor size, clinical course and cystic degeneration. The S518 phosphorylated Merlin bound CD44 was higher than wild-type Merlin bound CD44 in vestibular schwannoma tissues.
Conclusions:
The affinity of Merlin to CD44 was increased after phosphorylation at S518. Different cellular biological results might be triggered through binding to wild type Merlin and S518 phosphorylated Merlin.
Insights
Phosphorylation of Merlin at S518 increases its binding affinity to CD44 in vestibular schwannoma. This interaction may influence tumor growth and cellular behavior.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cellular Biology
Background:
- Vestibular schwannoma is a tumor affecting the nerve sheath.
- Merlin protein plays a role in tumor suppression.
- CD44 is implicated in cell adhesion and tumor progression.
Purpose of the Study:
- To investigate the effect of S518 phosphorylation of Merlin on its interaction with CD44.
- To assess the impact of this interaction on vestibular schwannoma growth.
Main Methods:
- Analysis of 35 vestibular schwannoma samples using immunohistopathology and western blot.
- Comparison of S518 phosphorylated Merlin levels with clinical parameters.
- Evaluation of Merlin-CD44 interaction via immunoprecipitation.
Main Results:
- S518 phosphorylated Merlin was found in vestibular schwannoma tissues with perinuclear localization.
- Phosphorylation levels were significantly higher in tumors than in normal nerve tissue.
- S518 phosphorylated Merlin showed increased binding to CD44 compared to wild-type Merlin.
Conclusions:
- Merlin phosphorylation at S518 enhances its affinity for CD44.
- This altered interaction may lead to distinct cellular outcomes in vestibular schwannoma.
