Calcified Tissue International

, Volume 104, Issue 2, pp 201–206 | Cite as

Nephronectin Expression is Inhibited by Inorganic Phosphate in Osteoblasts

  • Tadashi Kato
  • Atsushi YamadaEmail author
  • Kiyohito Sasa
  • Kentaro Yoshimura
  • Naoko Morimura
  • Hiroaki Ogata
  • Akiko Sakashita
  • Ryutaro Kamijo
Original Research


Nephronectin (Npnt), an extracellular matrix protein, is known to be a ligand of integrin α8β1, and it has also been known to play critical roles as various organs. In the present study, elevated extracellular inorganic phosphate (Pi) strongly inhibited the expression of Npnt in MC3T3-E1 cells, while the existence of extracellular calcium (Ca) was indispensable for its effect. Furthermore, Pi-induced inhibition of Npnt gene expression was recovered by inhibitors of both sodium-dependent Pi transporter (Pit) and fibroblast growth factor receptors (Fgfrs). These results demonstrated that Npnt gene expression is regulated by extracellular Pi via Pit and Fgfrs.


Nephronectin Phosphate Calcium MC3T3-E1 FGFR 



This work was supported in part by the Project to Establish Strategic Research Center for Innovative Dentistry by the Ministry of Education, Culture, Sports, Science and Technology of Japan (S1411009), the Private University Research Branding Project from MEXT of Japan, and Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (16K15782, 15H05016, 15K11051, 17K09737).

Author Contributions

TK, AY, KS, KY, NM, HO, AS, and RK involved in study concept. AY, KS, and RK: involved in formal analysis; AY, HO, AS, and RK acquired funding; TK investigated the study; TK, AY, and RK applied methodology for the study; AY and RK administrated the project; HO, AS, and RK collected the resources; AY and RK supervised and validated the study; TK and AY wrote the original manuscript; TK, AY, and RK reviewed and edited the original manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflicts of interest in regard to this study.

Human and Animal Rights and Informed Consent

All animal experiments were performed in accordance with the guide for care and use of laboratory animals and approved by the Showa University Animal Care Use and Committee.

Supplementary material

223_2018_484_MOESM1_ESM.tif (48 kb)
Supplementary material 1 (TIF 48 KB)
223_2018_484_MOESM2_ESM.tif (45 kb)
Supplementary material 2 (TIF 44 KB)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Tadashi Kato
    • 1
    • 2
  • Atsushi Yamada
    • 1
    Email author
  • Kiyohito Sasa
    • 1
  • Kentaro Yoshimura
    • 1
  • Naoko Morimura
    • 3
  • Hiroaki Ogata
    • 2
  • Akiko Sakashita
    • 2
  • Ryutaro Kamijo
    • 1
  1. 1.Department of Biochemistry, School of DentistryShowa UniversityShinagawaJapan
  2. 2.Department of Internal MedicineShowa University Northern Yokohama HospitalTsuzuki, YokohamaJapan
  3. 3.Department of Integrative PhysiologyShiga University of Medical ScienceOtsuJapan

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