Effects of Humoral Hypercalcemia of Malignancy and Gallium Nitrate on Thyroid C Cells in Nude Mice: Immunohistochemical and Ultrastructural Investigations
Free accessResearch articleFirst published online May, 1994
Effects of Humoral Hypercalcemia of Malignancy and Gallium Nitrate on Thyroid C Cells in Nude Mice: Immunohistochemical and Ultrastructural Investigations
Immunohistochemical and ultrastructural investigations of thyroid C cells were conducted in male nude (athymic) mice bearing a serially transplantable canine adenocarcinoma (CAC-8) model of humoral hypercalcemia of malignancy following subcutaneous administration of gallium nitrate. The following four groups were investigated: 1) vehicle-treated non-tumor-bearing control mice; 2) non-tumor-bearing mice treated with gallium nitrate; 3) vehicle-treated hypercalcemic mice bearing CAC-8; and 4) CAC-8 tumor-bearing mice treated with gallium nitrate. Gallium nitrate-treated tumor-bearing mice had a significant decrease in serum calcium as compared with tumor-bearing controls. C cells of non-tumor-bearing mice stained intensely for calcitonin and calcitonin gene-related peptide and weakly for chromogranin A and neuron-specific enolase. In C cells of both vehicle- and gallium-treated tumor-bearing mice, immunoreactive staining was decreased for calcitonin, calcitonin gene-related peptide, and chromogranin A, whereas there was a moderate increase in staining for neuron-specific enolase. Ultrastructurally, thyroid C cells in hypercalcemic tumor-bearing control and gallium-treated mice were hypertrophic and markedly degranulated as compared with those of non-tumor-bearing controls. Hypertrophic C cells contained few mature secretory granules, a well-developed Golgi apparatus, and lamellar arrays of rough endoplasmic reticulum. There was no evidence of C-cell hyperplasia. Immunohistochemical and ultrastructural findings revealed that C cells in mice with cancer-associated hypercalcemia were primarily in the actively synthesizing phase of the secretory cycle and had diminished immunoreactivity for calcitonin, calcitonin gene-related peptide, and chromogranin A. Gallium nitrate did not alter immunohistochemical or ultrastructural features of chronically stimulated C cells even though serum calcium was reduced.
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