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Characterization of a human rhabdomyosarcoma cell strain in tissue culture
Abstract:
A new human rhabdomyosarcoma cell strain, designated KYM-1, has been established from a neck tumor found in a 9-month-old infant. The cultured cells were round and mainly free-floating or in a moniliform pattern with a population doubling time of 75 hours. In stained preparations, the cells were pleomorphic and had a single round or oval nucleus in non-striated cytoplasm. However, the intracellular presence of myogenic markers was clearly shown by enzyme-immunochemical stains. An ultrastructural feature of the KYM-1 cells was the presence of numerous intermediate filaments in the perinuclear area and around the Golgi complexes which were associated with abundant cell organelles and aggregates of glycogen granules. High viscosity of the spent culture medium was attributed to hyaluronic acid, identified by electrophoresis and hyaluronidase digestion, and immunological and biochemical analyses revealed that the increased concentration of plasminogen activator activity found in the culture medium was almost wholly of the tissue plasminogen activator type. The KYM-1 cells also contained high concentrations of alkaline phosphatase activity. Tumorigenicity of the cells was confirmed by heterotransplantation into hamsters treated with anti-thymocyte serum.
Insights
A new human rhabdomyosarcoma cell line, KYM-1, was established from infant neck tumors. This cell line exhibits myogenic markers and tumorigenicity, offering a valuable model for rhabdomyosarcoma research.
Area of Science:
- Cell Biology
- Oncology
- Biochemistry
Background:
- Rhabdomyosarcoma is a pediatric soft tissue sarcoma.
- Establishing new cell lines is crucial for understanding cancer biology and developing therapies.
Purpose of the Study:
- To establish and characterize a new human rhabdomyosarcoma cell line (KYM-1).
- To investigate the biological and biochemical properties of the KYM-1 cell line.
Main Methods:
- Cell culture and morphological analysis.
- Enzyme-immunochemical staining for myogenic markers.
- Ultrastructural examination using electron microscopy.
- Biochemical analysis of culture medium (hyaluronic acid, plasminogen activator activity, alkaline phosphatase).
- Heterotransplantation into immunocompromised hamsters.
Main Results:
- The KYM-1 cell line was successfully established from an infant neck tumor.
- Cells displayed pleomorphic morphology with myogenic markers, intermediate filaments, and glycogen granules.
- Culture medium was rich in hyaluronic acid and tissue plasminogen activator activity.
- KYM-1 cells showed high alkaline phosphatase activity and were tumorigenic in vivo.
Conclusions:
- The KYM-1 cell line represents a novel human rhabdomyosarcoma model.
- This cell line possesses distinct cellular and biochemical characteristics relevant to rhabdomyosarcoma.
- KYM-1 cells provide a valuable tool for future research into rhabdomyosarcoma pathogenesis and treatment.