Abstract
Congenital diseases that could result in hyperphosphatemia at an early age include hyperphosphatemic familial tumoral calcinosis (HFTC)/hyperostosis-hyperphosphatemia syndrome (HHS) and congenital hypoparathyroidism/pseudohypoparathyroidism due to the insufficient activity of fibroblast growth factor (FGF) 23 and parathyroid hormone. HFTC/HHS is a rare autosomal recessive disease caused by inactivating mutations in the FGF23, UDP-N-acetyl-alpha-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase 3 (GALNT3), or Klotho (KL) genes, resulting in the excessive cleavage of active intact FGF23 (FGF23, GALNT3) or increased resistance to the action of FGF23 (KL). Massive ectopic calcification, known as tumoral calcinosis (TC), is seen in periarticular soft tissues, typically in the hip, elbow, and shoulder in HFTC/HHS, reducing the range of motion. However, other regions, such as the eye, intestine, vasculature, and testis, are also targets of ectopic calcification. The other symptoms of HFTC/HHS are painful hyperostosis of the lower legs, dental abnormalities, and systemic inflammation. Low phosphate diets, phosphate binders, and phosphaturic reagents such as acetazolamide are the treatment options for HFTC/HHS and have various consequences, which warrant the development of novel therapeutics involving recombinant FGF23.
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Acknowledgements
This work was supported in part by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science. We also want to thank Prof. Yaacov Frishberg from Shaare Zedek Medical Center in Israel for providing us a roentgenographic image of an affected patient.
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Funding was provided by Ministry of Health, Labour and Welfare (Grant Nos. 18K09018 and 19H03676).
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Ito, N., Fukumoto, S. Congenital Hyperphosphatemic Conditions Caused by the Deficient Activity of FGF23. Calcif Tissue Int 108, 104–115 (2021). https://doi.org/10.1007/s00223-020-00659-6
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DOI: https://doi.org/10.1007/s00223-020-00659-6