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Endocrine, Metabolic & Immune Disorders - Drug Targets

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ISSN (Print): 1871-5303
ISSN (Online): 2212-3873

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General Research Article

Increased Circulatory Extrarenal 1α,25-Dihydroxyvitamin D3 in Bilaterally Nephrectomized Rats

Author(s): Murat Dabak*, Durrin O. Dabak, Tuncay Kuloglu, Ersoy Baydar, Hakan Bulut and Ozgur Ozoner

Volume 20, Issue 9, 2020

Page: [1523 - 1530] Pages: 8

DOI: 10.2174/1871530320666200530222426

Price: $65

Abstract

Background: Extrarenal 1α,25-dihydroxyvitamin D3 (1,25-D) locally produced by immune cells plays crucial roles in the regulation of the immune system. However, in vivo status of extrarenal 1,25-D and 25-hydroxyvitamin D (25-D) in acute inflammatory conditions are unknown.

Objective: The aim of this study was to determine the extrarenal 1,25-D level in circulation in bilaterally nephrectomized rats, induced by low-dose lipopolysaccharide (LPS).

Methods: Renal 1,25-D synthesis was terminated through bilateral nephrectomy in rats. The rats received intraperitoneal LPS (50 μg/kg BW) three times and the experiment was ended 24 hours after nephrectomy. Serum 1,25-D, 25-D, calcium, phosphorus, intact parathyroid hormone, and calcitonin levels were measured and immunohistochemistry was applied to detect the sources of extrarenal 1,25- D synthesis.

Results: Circulatory 1,25-D concentration remarkably increased in both LPS-treated and non-treated bilaterally nephrectomized rats. Elevated circulatory 1,25-D did not have hypercalcemic endocrinal effects. The increased 1,25-D level also resulted in a concurrent rapid and dramatic depletion of circulatory 25-D.

Conclusion: Extrarenal 1,25-D could enter into the systemic circulation and, therefore, might have systemic effects besides its autocrine and paracrine functions.

Keywords: 1α, 25-dihydroxyvitamin D3, 25-hydroxyvitamin D, inflammation, extrarenal, anephric, rat.

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