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FGF23 modulates the effects of erythropoietin on gene expression in renal epithelial cells.

ABSTRACT: Background:FGF23 plays an important role in calcium-phosphorus metabolism. Other roles of FGF23 have recently been reported, such as commitment to myocardium enlargement and immunological roles in the spleen. In this study, we aimed to identify the roles of FGF23 in the kidneys other than calcium-phosphorus metabolism. Methods:DNA microarrays and bioinformatics tools were used to analyze gene expression in mIMCD3 mouse renal tubule cells following treatment with FGF23, erythropoietin and/or an inhibitor of ERK. Results:Three protein-coding genes were upregulated and 12 were downregulated in response to FGF23. Following bioinformatics analysis of these genes, PPAR? and STAT3 were identified as candidate transcript factors for mediating their upregulation, and STAT1 as a candidate for mediating their downregulation. Because STAT1 and STAT3 also mediate erythropoietin signaling, we investigated whether FGF23 and erythropoietin might show interactive effects in these cells. Of the 15 genes regulated by FGF23, 11 were upregulated by erythropoietin; 10 of these were downregulated following cotreatment with FGF23. Inhibition of ERK, an intracellular mediator of FGF23, reversed the effects of FGF23. However, FGF23 did not influence STAT1 phosphorylation, suggesting that it impinges on erythropoietin signaling through other mechanisms. Conclusion:Our results suggest cross talk between erythropoietin and FGF23 signaling in the regulation of renal epithelial cells.

SUBMITTER: Yashiro M

PROVIDER: S-EPMC5894721 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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FGF23 modulates the effects of erythropoietin on gene expression in renal epithelial cells.

Yashiro Mitsuru M Ohya Masaki M Mima Toru T Ueda Yumi Y Nakashima Yuri Y Kawakami Kazuki K Ishizawa Yohei Y Yamamoto Shuto S Kobayashi Sou S Yano Takurou T Tanaka Yusuke Y Okuda Kouji K Sonou Tomohiro T Shoshihara Tomohiro T Iwashita Yuko Y Iwashita Yu Y Tatsuta Kouichi K Matoba Ryo R Negi Shigeo S Shigematsu Takashi T

International journal of nephrology and renovascular disease 20180404

<h4>Background</h4>FGF23 plays an important role in calcium-phosphorus metabolism. Other roles of FGF23 have recently been reported, such as commitment to myocardium enlargement and immunological roles in the spleen. In this study, we aimed to identify the roles of FGF23 in the kidneys other than calcium-phosphorus metabolism.<h4>Methods</h4>DNA microarrays and bioinformatics tools were used to analyze gene expression in mIMCD3 mouse renal tubule cells following treatment with FGF23, erythropoie ...[more]

PMID: 29670389

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Project description:Excess fibroblast growth factor 23 (FGF23), excess PTH, and an increase in extracellular calcium cause hypophosphatemia by lowering the maximum renal phosphate reabsorption threshold (TmP/GFR). We recently reported two cases of X-linked hypophosphatemia (XLH) with severe tertiary hyperparathyroidism who had normalization of TmP/GFR upon being rendered hypoparathyroid following total parathyroidectomy, despite marked excess in both C-terminal FGF23 (cFGF23) and intact FGF23 (iFGF23). We explored the effects of FGF23, PTH, and calcium on TmP/GFR in a cross-sectional study (n =?74) across a spectrum of clinical cases with abnormalities in TmP/GFR, PTH, and FGF23. This comprised three groups: FGF23-dependent hypophosphatemia (n =?27), hypoparathyroidism (HOPT; n =?17), and chronic kidney disease (n =?30). Measurements included TmP/GFR, cFGF23, PTH, ionized calcium, vitamin D metabolites, and bone turnover markers. The combined effect of cFGF23, PTH, and ionized calcium on TmP/GFR was modeled using hierarchical multiple regression and was probed by moderation analysis with PROCESS. Modeling analysis showed independent effects on TmP/GFR by cFGF23, PTH, and ionized calcium in conjunction with a weak but significant effect of the interaction term for PTH and FGF23; probing showed that the effect was most prominent during PTH deficiency. Teriparatide 20??g daily was self-administered for 28?days by one case of X-linked hypophosphatemia with hypoparathyroidism (XLH-HOPT) to assess the response of TmP/GFR, cFGF23, iFGF23, nephrogenous cyclic adenosine monophosphate (NcAMP), vitamin D metabolites, and bone turnover markers. After 28?days, TmP/GFR was lowered from 1.10?mmol/L to 0.48?mmol/L; this was accompanied by increases in NcAMP, ionized calcium, and bone turnover markers. In conclusion, the effect of FGF23 excess on TmP/GFR is altered by PTH such that the effect is ameliorated by hypoparathyroidism and the effect is augmented by hyperparathyroidism. © 2020 The Authors. JBMR Plus published by Wiley Periodicals LLC. on behalf of American Society for Bone and Mineral Research.

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FGF23 modulates the effects of erythropoietin on gene expression in renal epithelial cells.

Publications

FGF23 modulates the effects of erythropoietin on gene expression in renal epithelial cells.

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