FGF-23 transgenic mice demonstrate hypophosphatemic rickets with reduced expression of sodium phosphate cotransporter type IIa

• Published in: Biochemical and biophysical research communications Vol. 314; no. 2; pp. 409 - 414
• Main Authors: Shimada, Takashi, Urakawa, Itaru, Yamazaki, Yuji, Hasegawa, Hisashi, Hino, Rieko, Yoneya, Takashi, Takeuchi, Yasuhiro, Fujita, Toshiro, Fukumoto, Seiji, Yamashita, Takeyoshi
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 06.02.2004
• Subjects: 1,25-Dihydroxyvitamin D; Animals; Animals, Newborn; Bone and Bones - diagnostic imaging; FGF-23; Fibroblast Growth Factors - genetics; Fibroblast Growth Factors - physiology; Humans; Hypophosphatemic rickets; Immunohistochemistry; Kidney Tubules - metabolism; Mice; Mice, Transgenic; Plasmids - metabolism; Radiography; Reverse Transcriptase Polymerase Chain Reaction; Rickets - genetics; Sodium phosphate cotransporter type IIa; Sodium-Phosphate Cotransporter Proteins; Sodium-Phosphate Cotransporter Proteins, Type IIa; Symporters - biosynthesis; Symporters - genetics; Time Factors; Tissue Distribution; Transgenes; Vitamin D - analogs & derivatives; Vitamin D - blood; Sodium phosphate cotransporter type IIa; Hypophosphatemic rickets; FGF-23; 1,25-Dihydroxyvitamin D
• ISSN: 0006-291X; 1090-2104
• DOI: 10.1016/j.bbrc.2003.12.102

Fibroblast growth factor (FGF)-23 was identified as a causative factor of tumor-induced osteomalacia and also as a responsible gene for autosomal dominant hypophosphatemic rickets. To clarify the pathophysiological roles of FGF-23 in these diseases, we generated its transgenic mice. The transgenic mice expressing human FGF-23 reproduced the common clinical features of these diseases such as hypophosphatemia probably due to increased renal phosphate wasting, inappropriately low serum 1,25-dihydroxyvitamin D level, and rachitic bone. The renal phosphate wasting in the transgenic mice was accompanied by the reduced expression of sodium phosphate cotransporter type IIa in renal proximal tubules. These results reinforce the notion that the excessive action of FGF-23 plays a causative role in the development of several hypophosphatemic rickets/osteomalacia.