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Calcitonin production by rat thyroid tumours
The Journal of Endocrinology
|July 1, 1975
Summary
Calcitonin, a hormone, is present in normal rat C cells and secreted by C cell tumors. These rat tumors show similarities to human medullary carcinomata.
Area of Science:
- Endocrinology
- Oncology
- Immunohistochemistry
Background:
- C cell tumors in rats share similarities with human medullary carcinomata.
- Understanding calcitonin production in rat C cells and tumors is crucial.
Purpose of the Study:
- To investigate the presence and secretion of calcitonin in normal rat C cells and C cell tumors.
- To compare calcitonin levels in plasma of normal and tumor-bearing rats.
Main Methods:
- Immunolocalization techniques (indirect 'sandwich' method) were used on rat thyroid tissues.
- Plasma calcitonin levels were measured using an immunoradiometric assay.
- Both normal and tumor tissues were analyzed for calcitonin presence and distribution.
Main Results:
- Normal C cells and C cell tumors exhibited positive staining for calcitonin.
- Tumor cell staining intensity varied but was generally lower than normal C cells.
- Detectable plasma calcitonin levels were found in most rats, with significantly higher concentrations in rats with C cell tumors.
Conclusions:
- Calcitonin is present in normal rat C cells and is both contained and secreted by C cell tumors.
- Rat C cell tumors demonstrate functional similarities to human medullary carcinomata.
- These findings support the use of rat models for studying human thyroid C cell neoplasia.