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Related Experiment Videos

Canine mast cell tumors express stem cell factor receptor.

M J Reguera1, R M Rabanal, A Puigdemont

  • 1Department of Patologia i Producció Animals, Universitat Autònoma de Barcelona, Spain.

The American Journal of Dermatopathology
|March 4, 2000
PubMed
Summary

Canine mast cell tumors (MCTs) consistently express the KIT receptor. KIT expression inversely correlates with tumor differentiation, making it a reliable marker for diagnosing canine mast cell tumors.

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Area of Science:

  • Veterinary Pathology
  • Molecular Biology
  • Oncology

Background:

  • The c-kit protooncogene encodes the KIT receptor tyrosine kinase, also known as the stem cell factor receptor.
  • KIT signaling is crucial for mast cell growth and differentiation.
  • Canine mast cell tumors (MCTs) are common skin neoplasms with variable behavior.

Purpose of the Study:

  • To investigate KIT protein expression in canine mast cell tumors (MCTs) and other skin neoplasms using immunohistochemistry.
  • To determine if KIT expression can serve as a diagnostic marker for canine MCTs.
  • To explore the correlation between KIT expression patterns and tumor grade.

Main Methods:

  • Immunohistochemical analysis of KIT expression in 23 canine MCTs, 10 histiocytomas, 5 malignant melanomas, and canine/human mast cell lines.

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  • Evaluation of KIT localization (cell membrane vs. cytoplasm) within mast cells.
  • Correlation of KIT expression intensity and patterns with tumor differentiation (grades I, II, III).

    • Main Results:

    • KIT was detected in all canine MCTs, with varying staining intensity.
    • Grade III MCTs exhibited the highest KIT expression, while Grade I MCTs showed the lowest.
    • KIT expression was specific to mast cells in normal skin and absent in other investigated neoplasms.
    • Two distinct KIT expression patterns were observed: cell membrane and cytoplasmic accumulation.

    Conclusions:

    • KIT is a highly reliable immunohistochemical marker for canine mast cells and MCTs.
    • KIT expression demonstrates an inverse correlation with the degree of tumor differentiation in canine MCTs.
    • The observed cytoplasmic accumulation of KIT in some MCTs warrants further investigation into its functional significance.