PTH and 1.25 vitamin D response to a low-calcium diet is associated with bone mineral density in renal stone formers

Pasch, Andreas; Frey, Felix J; Eisenberger, Ute; Mohaupt, Markus G; Bonny, Olivier (2008). PTH and 1.25 vitamin D response to a low-calcium diet is associated with bone mineral density in renal stone formers. Nephrology, dialysis, transplantation, 23(8), pp. 2563-70. Oxford: Oxford University Press 10.1093/ndt/gfn091

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BACKGROUND: Renal calcium stones and hypercalciuria are associated with a reduced bone mineral density (BMD). Therefore, the effect of changes in calcium homeostasis is of interest for both stones and bones. We hypothesized that the response of calciuria, parathyroid hormone (PTH) and 1.25 vitamin D to changes in dietary calcium might be related to BMD. METHODS: A single-centre prospective interventional study of 94 hyper- and non-hypercalciuric calcium stone formers consecutively retrieved from our stone clinic. The patients were investigated on a free-choice diet, a low-calcium diet, while fasting and after an oral calcium load. Patient groups were defined according to lumbar BMD (z-score) obtained by dual X-ray absorptiometry (group 1: z-score <-0.5, n = 30; group 2: z-score -0.5-0.5, n = 36; group 3: z-score >0.5, n = 28). The effect of the dietary interventions on calciuria, 1.25 vitamin D and PTH in relation to BMD was measured. RESULTS: An inverse relationship between BMD and calciuria was observed on all four calcium intakes (P = 0.009). On a free-choice diet, 1.25 vitamin D and PTH levels were identical in the three patient groups. However, the relative responses of 1.25 vitamin D and PTH to the low-calcium diet were opposite in the three groups with the highest increase of 1.25 vitamin D in group 1 and the lowest in group 3, whereas PTH increase was most pronounced in group 3 and least in group 1. CONCLUSION: Calcium stone formers with a low lumbar BMD exhibit a blunted response of PTH release and an apparently overshooting production of 1.25 vitamin D following a low-calcium diet.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Dermatology, Urology, Rheumatology, Nephrology, Osteoporosis (DURN) > Clinic of Nephrology and Hypertension

UniBE Contributor:

Pasch, Andreas; Frey, Felix Julius; Eisenberger, Ute and Mohaupt, Markus

ISSN:

0931-0509

ISBN:

18398019

Publisher:

Oxford University Press

Language:

English

Submitter:

Markus Georg Mohaupt

Date Deposited:

04 Oct 2013 15:06

Last Modified:

27 Apr 2018 10:11

Publisher DOI:

10.1093/ndt/gfn091

PubMed ID:

18398019

Web of Science ID:

000258143300022

BORIS DOI:

10.7892/boris.28734

URI:

https://boris.unibe.ch/id/eprint/28734 (FactScience: 128099)

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