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The parathyroid oxyphil cell content increases in patients with chronic kidney disease (CKD), and even more in patients treated with the calcimimetic cinacalcet and/or calcitriol for hyperparathyroidism. Oxyphil cells have significantly more calcium-sensing receptors than chief cells, suggesting that the calcium-sensing receptor and calcimimetics are involved in the transdifferentiation of a chief cell to an oxyphil cell type. Here, we compared the effect of the vitamin D analog paricalcitol (a less calcemic analog of calcitriol) and/or cinacalcet on the oxyphil cell content in patients with CKD to further investigate the genesis of these cells. Parathyroid tissue from four normal individuals and 27 patients with CKD who underwent parathyroidectomy for secondary hyperparathyroidism were analyzed. Prior to parathyroidectomy, patients had received the following treatment: seven with no treatment, seven with cinacalcet only, eight with paricalcitol only, or cinacalcet plus paricalcitol in five. Oxyphilic areas of parathyroid tissue, reported as the mean percent of total tissue area per patient, were normal, 1.03; no treatment, 5.3; cinacalcet, 26.7 (significant vs. no treatment); paricalcitol, 6.9 (significant vs. cinacalcet; not significant vs. no treatment); and cinacalcet plus paricalcitol, 12.7. Cinacalcet treatment leads to a significant increase in parathyroid oxyphil cell content but paricalcitol does not, reinforcing a role for the calcium-sensing receptor activation in the transdifferentiation of chief-to-oxyphil cell type. Thus, two conventional treatments for hyperparathyroidism have disparate effects on parathyroid composition, and perhaps function. This finding is provocative and may be useful when evaluating future drugs for hyperparathyroidism.
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