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Ultraviolet B activated 1,25(OH)2D affects the level of fibroblast growth factor-23 in human

Authors
 Ju Hee Lee ; Kyoung Min Kim ; Yumie Rhee ; Sung-Kil Lim ; Yoon Kee Park ; Do Young Kim ; Han Seok Choi ; Dong Yeob Shin 
Citation
 Endocrine Journal, Vol.60(1) : 81~86, 2013 
Journal Title
 Endocrine Journal 
ISSN
 0918-8959 
Issue Date
2013
Abstract
Fibroblast growth factor 23 (FGF-23) is known as a phosphaturic factor regulating phosphate homeostasis. Several studies suggest that dietary phosphate, serum phosphate and 1,25-dihydroxyvitamin D [1,25(OH)(2)D] are candidate regulators of FGF-23. While the human studies, which modulated the dietary or serum phosphate showed in rather controversial results, manipulation of the active vitamin D definitely affected FGF-23 in animals. This study was conducted to elucidate the relationship between active vitamin D directly stimulated by ultraviolet B (UVB) exposure and FGF-23 level in human. Ten healthy young adults were recruited to get the UVB exposure thrice a week at sub-minimal erythemal dose with gradual increment by 10% only for 4 weeks. Serum calcium, phosphate, mineral-related hormones and bone turnover markers were analyzed before and after the UVB exposure every 4 week for 12 whole weeks. Twenty five-hydroxyvitamin D [25(OH)D] increased by 115% (19.8 ng/mL to 40.5 ng/mL, p < 0.001) after 4 weeks of UVB exposure. While 1,25(OH)(2)D increased by 75% (49.9 pg/mL to 64.4 pg/mL, p < 0.001) then both level decreased after 4 weeks of withdrawal. C-telopeptide peaked at 2nd week then decreased, while osteocalcin increased gradually. FGF-23 started to increase from the 4th week of UVB exposure then significantly at the 4th week after withdrawal of UVB (27.8 pg/mL to 41.4 pg/mL, p < 0.05). UVB exposure effectively increased 1,25(OH)(2)D with delayed stimulatory effect on FGF-23. This result could support the regulatory loop of 1,25(OH)(2)D and FGF-23 in human, FGF-23 regulation by 1,25(OH)(2)D.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/86236
DOI
10.1507/endocrj.EJ12-0199
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Dermatology
1. 연구논문 > 1. College of Medicine > Dept. of Internal Medicine
Yonsei Authors
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