Molecular and Cellular Biochemistry

, Volume 342, Issue 1–2, pp 95–100 | Cite as

l-Carnitine is essential to β-oxidation of quarried fatty acid from mitochondrial membrane by PLA2

  • Hiromi Yano
  • Eri Oyanagi
  • Yasuko Kato
  • Yoshiyuki Samejima
  • Junzo Sasaki
  • Kozo Utsumi


Mitochondrial β-oxidation is an important system involved in the energy production of various cells. In this system, the function of l-carnitine is essential for the uptake of fatty acids to mitochondria. However, it is unclear whether or not endogenous respiration, ADP-induced O2 consumption without substrates, is caused by l-carnitine treatment. In this study, we investigated whether l-carnitine is essential to the β-oxidation of quarried fatty acids from the mitochondrial membrane by phospholipase A2 (PLA2) using isolated mitochondria from the liver of rats. Intact mitochondria were incubated in a medium containing Pi, CoA and l-carnitine. The effect of l-carnitine treatment on ADP-induced mitochondrial respiration was observed without exogenous respiratory substrate. Increase in mitochondrial respiration was induced by treatment with l-carnitine in a concentration-dependent manner. Treatment with rotenone, a complex I blocker, completely inhibited ADP-induced oxygen consumption even in the presence of l-carnitine. Moreover, the l-carnitine dependent ADP-induced mitochondrial oxygen consumption did not increase when PLA2 inhibitors were treated before ADP treatment. The l-carnitine-dependent ADP-induced oxygen consumption did contribute to ATP productions but not heat generation via an uncoupling system. These results suggest that l-carnitine might be essential to the β-oxidation of quarried fatty acids from the mitochondrial membrane by PLA2.


Oxygen consumption ADP CoA β-oxidation Fatty acid Rat liver 



Carnitine palmitoyl transferase I


Organic cation/carnitine transporter 2


Phospholipase A2


Coenzyme A






Mefenamic acid


Aristolochic acid


Ethylene glycol tetraacetic acid


Ratio of respiratory control


Bovine serum albumin


Ca2+-independent PLA2



This study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan (C-#2100700).


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Copyright information

© Springer Science+Business Media, LLC. 2010

Authors and Affiliations

  • Hiromi Yano
    • 1
  • Eri Oyanagi
    • 2
  • Yasuko Kato
    • 3
  • Yoshiyuki Samejima
    • 1
  • Junzo Sasaki
    • 2
  • Kozo Utsumi
    • 2
  1. 1.Department of Health & Sports ScienceKawasaki University of Medical WelfareKurashikiJapan
  2. 2.Department of Cytology & HistologyOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesShikataJapan
  3. 3.Department of Clinical NutritionKawasaki University of Medical WelfareKurashikiJapan

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