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Neuroblastoma cell lines showing smooth muscle cell phenotypes
1Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan.
Summary
Neuroblastoma S-type cells express smooth muscle proteins, suggesting neural crest cells can differentiate into smooth muscle cells. This finding clarifies the origin of S-type neuroblastoma cells.
Area of Science:
- Oncology
- Developmental Biology
- Cell Biology
Background:
- Neuroblastoma is a neural crest-derived tumor.
- Human neuroblastoma cell lines present as neuroblastic (N)-type, substrate-adhesive (S)-type, and intermediate (I)-type.
- The origin of S-type cells remains unclear.
Purpose of the Study:
- To investigate the origin of S-type neuroblastoma cells.
- To determine if S-type cells exhibit smooth muscle cell characteristics.
Main Methods:
- Examined expression of smooth muscle-specific proteins (desmin, alpha-smooth muscle actin, basic calponin, SM1, SM2) in neuroblastoma cell lines.
- Utilized indirect immunofluorescence, Western blot, and reverse transcription-polymerase chain reaction (RT-PCR).
Main Results:
- Alpha-smooth muscle actin and basic calponin were detected in all seven cell lines.
- Desmin was found in two cell lines.
- SM1 and SM2 smooth muscle myosin heavy-chain isoforms were detected in S-type cell lines.
- N-type cells lacked these smooth muscle markers.
Conclusions:
- S-type neuroblastoma cells display immature or mature smooth muscle cell phenotypes.
- Neural crest cells possess the potential to differentiate into smooth muscle cells in humans.