Abstract
Although the parathyroid water-clear cell is very rare, it has clinical significance because of its association with parathyroid hyperplasia or adenoma. SAMP6, a substrain of senescence-accelerated mouse, was developed as an animal model for senile osteoporosis. We investigated the morphology of the parathyroid glands in SAMP6 and age-matched normal mouse SAMR1. The parathyroid water-clear cells, which contained numerous vacuoles and the crystalloid inclusions, were found in SAMP6 mice at 5, 8 and 12 months of age. It was noted that the number of water-clear cells increased with aging, which are fairly consistent with the change of the serum parathyroid hormone (PTH) level. We did not find any water-clear cells in the parathyroid glands of SAMR1 mice. The existence of water-clear cells may represent hyperfunction of the parathyroid glands in SAMP6.
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