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Calcitriol, via its receptor (VDR) is a main regulator of PTH secretion and parathyroid cell proliferation. Recently, marked overrepresentation of the polymorphic VDR alleles b, a, and T was found in patients with primary hyperparathyroidism (pHPT), which suggests pathogenic importance in the disease. Using the ribonuclease protection assay, relative VDR and PTH messenger ribonucleic acid (mRNA) levels of parathyroid adenomas from 42 patients with sporadic pHPT were related to these VDR polymorphisms. The tumors of patients homozygous for the b, a, or T alleles demonstrated significantly lower VDR and higher PTH mRNA levels than those exhibiting the BB, AA, or tt genotypes (P &lt; 0.0001-0.02), whereas heterozygotes had intermediate values. A similar discrepancy was found when comparing the baT and non-baT haplotypes (0.042 +/- 0.005 vs. 0.064 +/- 0.004 for VDR; 34.4 +/- 3.7 vs. 21.6 +/- 2.2 for PTH; both P &lt; 0.005). The lower VDR mRNA levels associated with the b, a, and T alleles may affect the calcitriol-mediated control of parathyroid function and thereby contribute to the development of sporadic pHPT.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Vitamin D Receptor (VDR) and Parathyroid Hormone Messenger Ribonucleic Acid Levels Correspond to Polymorphic VDR Alleles in Human Parathyroid Tumors<sup>1</sup>

Vitamin D Receptor (VDR) and Parathyroid Hormone Messenger Ribonucleic Acid Levels Correspond to Polymorphic VDR Alleles in Human Parathyroid Tumors1

Vitamin D Receptor (VDR) and Parathyroid Hormone Messenger Ribonucleic Acid Levels Correspond to Polymorphic VDR Alleles in Human Parathyroid Tumors¹