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The Journal of Physiological Sciences

, Volume 68, Issue 1, pp 33–41 | Cite as

Eicosapentaenoic acid triggers Ca2+ release and Ca2+ influx in mouse cerebral cortex endothelial bEND.3 cells

  • King-Chuen Wu
  • Kar-Lok Wong
  • Mei-Ling Wang
  • Lian-Ru Shiao
  • Iat-Lon Leong
  • Chi-Li Gong
  • Ka-Shun Cheng
  • Paul Chan
  • Yuk-Man LeungEmail author
Original Paper

Abstract

Eicosapentaenoic acid (EPA), an omega-3 fatty acid abundant in fish oil, protects endothelial cells (EC) from lipotoxicity and triggers EC NO release. The latter is related to an elevation of cytosolic Ca2+. Although EPA has been shown to cause human EC cytosolic Ca2+ elevation, the mechanism is unclear. Microfluorimetric imaging was used here to measure free cytosolic Ca2+ concentration. EPA was shown to cause intracellular Ca2+ release in mouse cerebral cortex endothelial bEND.3 cells; interestingly, the EPA-sensitive intracellular Ca2+ pool(s) appeared to encompass and was larger than the Ca2+ pool mobilized by sarcoplasmic-endoplasmic reticulum Ca2+-ATPase inhibition by cyclopiazonic acid. EPA also opened a Ca2+ influx pathway pharmacologically distinct from store-operated Ca2+ influx. Surprisingly, EPA-triggered Ca2+ influx was Ni2+-insensitive; and EPA did not trigger Mn2+ influx. Further, EPA-triggered Ca2+ influx did not involve Na+–Ca2+ exchangers. Thus, our results suggest EPA triggered unusual mechanisms of Ca2+ release and Ca2+ influx in EC.

Keywords

Eicosapentaenoic acid Endothelial cells Ca2+ release Ca2+ influx 

Notes

Acknowledgements

Y.M.L, K.L.W and K.S.C would like to thank China Medical University, Taiwan, and the Ministry of Science and Technology of Taiwan for providing funding (103-2320-B-039-015-; 104-2320-B-039-030-; 104-2320-B-039-013-; 105-2320-B-039-028-; DMR-106-086; DMR-106-089). K.C.W would like to thank Chang Gung Memorial Hospital, Chiayi, for support (CMRPG6F0291).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interests.

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Copyright information

© The Physiological Society of Japan and Springer Japan 2016

Authors and Affiliations

  • King-Chuen Wu
    • 1
    • 2
  • Kar-Lok Wong
    • 3
  • Mei-Ling Wang
    • 4
  • Lian-Ru Shiao
    • 4
  • Iat-Lon Leong
    • 5
  • Chi-Li Gong
    • 4
  • Ka-Shun Cheng
    • 3
    • 6
  • Paul Chan
    • 7
  • Yuk-Man Leung
    • 4
    Email author
  1. 1.Department of AnesthesiologyChang Gung Memorial HospitalChiayiTaiwan
  2. 2.Chang Gung University of Science and TechnologyChiayiTaiwan
  3. 3.Department of AnesthesiologyChina Medical University HospitalTaichungTaiwan
  4. 4.Department of PhysiologyChina Medical UniversityTaichungTaiwan
  5. 5.Division of Cardiology, Department of Internal MedicineKiang Wu HospitalMacauChina
  6. 6.Department of AnesthesiologyThe Qingdao University Yuhuangding HospitalYantaiChina
  7. 7.Division of Cardiology, Department of MedicineTaipei Medical University Wan Fang HospitalTaipeiTaiwan

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