Establishment and Characterization of a Cell Line (S-RMS1) Derived from an Infantile Spindle Cell Rhabdomyosarcoma...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Spindle cell rhabdomyosarcoma (S-RMS) is a rare tumor, recently reclassified as a distinct subtype.
• S-RMS is characterized by specific gene fusions, including NCOA2, NCOA1, and VGLL2.

Purpose of the Study:

• To establish and characterize a novel cell line (S-RMS1) from an infantile S-RMS case.
• To investigate the molecular profile of S-RMS1, particularly its SRF-NCOA2 gene fusion.

Main Methods:

• Establishment of the S-RMS1 cell line from patient tumor tissue.
• Morphological and molecular analyses, including whole genome sequencing and Western blot.
• Comparison with existing RMS cell lines (RH30, RD18).

Main Results:

• S-RMS1 cells exhibited fibroblast-like morphology and expressed key myogenic markers (MyoD-1, myogenin, desmin, smooth muscle actin).
• Whole genome sequencing confirmed the SRF-NCOA2 gene fusion and matched the tumor's genetic profile.
• Differential gene expression observed, including downregulation of AKT-p, YAP-p, TGFßR1, Mef2C, and upregulation of endoglin, GATA6.

Conclusions:

• This study reports the first established cell line (S-RMS1) from infantile S-RMS with SRF-NCOA2 gene fusion.
• S-RMS1 serves as a crucial preclinical model for understanding the molecular mechanisms of this rare RMS subtype.