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Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
Published on: September 1, 2015
Mineral bone disease in autosomal dominant polycystic kidney disease
Berenice Gitomer1, Renata Pereira2, Isidro B Salusky2
1Division of Renal Diseases and Hypertension, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado, USA.
Insights
Autosomal dominant polycystic kidney disease (ADPKD) patients show altered bone metabolism with lower bone formation rates. However, ADPKD does not increase fracture risk in end-stage kidney disease patients.
Area of Science:
- Nephrology
- Bone Biology
- Metabolic Diseases
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) is a genetic disorder often leading to chronic kidney disease.
- Bone health in early-stage ADPKD patients remains understudied.
- Previous research in animal models indicates Pkd1 disruption affects bone density.
Purpose of the Study:
- To investigate the bone phenotype in adult ADPKD patients with early-stage chronic kidney disease.
- To analyze bone turnover markers and bone biology in ADPKD patients.
- To assess fracture risk in ADPKD patients with end-stage kidney disease.
Main Methods:
- Biochemical markers of mineral metabolism were measured in 944 patients.
- Bone biopsies from 20 ADPKD patients and 17 healthy controls underwent histomorphometry and immunohistochemistry.
- Fracture risk was analyzed in end-stage kidney disease patients initiating hemodialysis.
Main Results:
- ADPKD patients had higher intact fibroblast growth factor 23 and lower total alkaline phosphatase.
- Bone biopsies revealed significantly lower osteoid volume/bone volume and bone formation rate in ADPKD patients compared to controls.
- End-stage kidney disease due to ADPKD was not associated with increased fracture risk compared to diabetes or other kidney disease etiologies.
Conclusions:
- Individuals with ADPKD exhibit distinct bone metabolic profiles, including elevated FGF23 and reduced bone formation.
- Despite altered bone biology, ADPKD does not appear to elevate fracture risk in end-stage kidney disease.
- Further research may elucidate the long-term skeletal implications of ADPKD.
Abstract:
Mice with disruption of Pkd1 in osteoblasts demonstrate reduced bone mineral density, trabecular bone volume and cortical thickness. To date, the bone phenotype in adult patients with autosomal dominant polycystic kidney disease (ADPKD) with stage I and II chronic kidney disease has not been investigated. To examine this, we characterized biochemical markers of mineral metabolism, examined bone turnover and biology, and estimated risk of fracture in patients with ADPKD. Markers of mineral metabolism were measured in 944 patients with ADPKD and other causes of kidney disease. Histomorphometry and immunohistochemistry were compared on bone biopsies from 20 patients with ADPKD with a mean eGFR of 97 ml/min/1.73m2 and 17 healthy individuals. Furthermore, adults with end stage kidney disease (ESKD) initiating hemodialysis between 2002-2013 and estimated the risk of bone fracture associated with ADPKD as compared to other etiologies of kidney disease were examined. Intact fibroblast growth factor 23 was higher and total alkaline phosphatase lower in patients with compared to patients without ADPKD with chronic kidney disease. Compared to healthy individuals, patients with ADPKD demonstrated significantly lower osteoid volume/bone volume (0.61 vs. 1.21%) and bone formation rate/bone surface (0.012 vs. 0.026 μm3/μm2/day). ESKD due to ADPKD was not associated with a higher risk of fracture as compared to ESKD due to diabetes (age adjusted incidence rate ratio: 0.53 (95% confidence interval 0.31, 0.74) or compared to other etiologies of kidney disease. Thus, individuals with ADPKD have lower alkaline phosphatase, higher circulating intact fibroblast growth factor 23 and decreased bone formation rate. However, ADPKD is not associated with higher rates of bone fracture in ESKD.
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