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Exp Clin Endocrinol Diabetes 2024; 132(02): 91-97
DOI: 10.1055/a-2237-8863
Article

Bilirubin Down-Regulates Oxidative Stress and Fibroblast Growth Factor 23 Expression in UMR106 Osteoblast-Like Cells

Steffen Rausch
1   University of Hohenheim, Department of Physiology, Stuttgart, Germany
,
Katharina Hammerschmidt
1   University of Hohenheim, Department of Physiology, Stuttgart, Germany
,
Martina Feger
1   University of Hohenheim, Department of Physiology, Stuttgart, Germany
,
Libor Vítek
2   Fourth Department of Internal Medicine and Institute of Medical Biochemistry and Laboratory Diagnostics, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic
,
Michael Föller
1   University of Hohenheim, Department of Physiology, Stuttgart, Germany
› Author Affiliations Funding Information Deutsche Forschungsgemeinschaft — http://dx.doi.org/10.13039/501100001659; Fo695/2–1
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Abstract

Introduction Fibroblast growth factor 23 (FGF23) is a major regulator of phosphate and vitamin D metabolism in the kidney, and its higher levels in plasma are associated with poorer outcomes in kidney and cardiovascular diseases. It is produced by bone cells upon enhanced oxidative stress and inhibits renal phosphate reabsorption and calcitriol (active form of vitamin D) production. Bilirubin, the final product of the heme catabolic pathway in the vascular bed, has versatile biological functions, including antioxidant and anti-inflammatory effects. This study explored whether bilirubin alters FGF23 production.

Methods Experiments were performed using UMR106 osteoblast-like cells. Fgf23 transcript levels were determined by quantitative real-time polymerase chain reaction, C-terminal and intact FGF23 protein levels were determined by enzyme-linked immunosorbent assay, and cellular oxidative stress was assessed by CellROX assay.

Results Unconjugated bilirubin down-regulated Fgf23 gene transcription and FGF23 protein abundance; these effects were paralleled by lower cellular oxidative stress levels. Also, conjugated bilirubin reduced Fgf23 mRNA abundance.

Conclusion Bilirubin down-regulates FGF23 production in UMR106 cells, an effect likely to be dependent on the reduction of cellular oxidative stress.

Key words

Klotho - ROS - phosphate

Supplementary Material



Publication History

Received: 07 June 2023
Received: 14 December 2023

Accepted: 18 December 2023

Article published online:
19 February 2024

© 2024. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 

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