Expression of Fibroblast Growth Factor 23, Vitamin D Receptor, and Sclerostin in Bone Tissue from Hypercalciuric Stone Formers
Overview
Authors
Affiliations
Background And Objectives: Increased bone resorption, low bone formation, and abnormal mineralization have been described in stone formers with idiopathic hypercalciuria. It has been previously shown that the receptor activator of NF-κB ligand mediates bone resorption in idiopathic hypercalciuria (IH). The present study aimed to determine the expression of fibroblast growth factor 23 (FGF-23), vitamin D receptor (VDR), and sclerostin in bone tissue from IH stone formers.
Design, Setting, Participants, & Measurements: Immunohistochemical analysis was performed in undecalcified bone samples previously obtained for histomorphometry from 30 transiliac bone biopsies of idiopathic hypercalciuria stone-forming patients between 1992 and 2002 and 33 healthy individuals (controls). Serum parameters were obtained from their medical records.
Results: Histomorphometry disclosed 21 IH patients with high and 9 IH patients with normal bone resorption. Importantly, eroded surfaces (ES/BS) from IH patients but not controls were significantly correlated with VDR immunostaining in osteoblasts (r=0.51; P=0.004), sclerostin immunostaining in osteocytes (r=0.41; P=0.02), and serum 1,25-dihydroxyvitamin D (r=0.55; P<0.01). Of note, both VDR and sclerostin immunostaining were significantly correlated with serum 1,25-dihydroxyvitamin D in IH patients (r=0.52; P=0.01 and r=0.53; P=0.02, respectively), although VDR and sclerostin expression did not differ between IH and controls. IH patients with high bone resorption exhibited a significantly stronger sclerostin immunostaining than IH patients with normal bone resorption. FGF-23 expression in osteocytes from IH patients did not differ from controls and was not correlated with any histomorphometric parameter.
Conclusions: These findings suggest the contribution of VDR and sclerostin, as well as 1,25-dihydroxyvitamin D, to increase bone resorption in idiopathic hypercalciuria but do not implicate FGF-23 in the bone alterations seen in these patients.
Heilberg I, Carvalho A, Denburg M Curr Osteoporos Rep. 2024; 22(6):576-589.
PMID: 39356465 DOI: 10.1007/s11914-024-00888-w.
Serum sclerostin is associated with recurrent kidney stone formation independent of hypercalciuria.
Rodriguez D, Gurevich E, Mohammadi Jouabadi S, Pastor Arroyo E, Ritter A, Estoppey Younes S Clin Kidney J. 2024; 17(1):sfad256.
PMID: 38186870 PMC: 10768761. DOI: 10.1093/ckj/sfad256.
Urinary Calcium Is Associated with Serum Sclerostin among Stone Formers.
Rodrigues F, Ormanji M, Pietrobom I, Matos A, de Borst M, Heilberg I J Clin Med. 2023; 12(15).
PMID: 37568429 PMC: 10420207. DOI: 10.3390/jcm12155027.
Vascular Calcification Is Associated with Fetuin-A and Cortical Bone Porosity in Stone Formers.
Rodrigues F, Neves R, Ormanji M, Esper P, Gaspar M, Pereira R J Pers Med. 2022; 12(7).
PMID: 35887617 PMC: 9319706. DOI: 10.3390/jpm12071120.
Beta-thalassaemia major: Prevalence, risk factors and clinical consequences of hypercalciuria.
Aliberti L, Gagliardi I, Gamberini M, Ziggiotto A, Verrienti M, Carnevale A Br J Haematol. 2022; 198(5):903-911.
PMID: 35768889 PMC: 9542302. DOI: 10.1111/bjh.18345.