Futoshi Kuribayashi
   Department     ,
Article types 原著
Language English
Peer review Peer reviewed
Title Changes of energy matabolism induced by 1-Methyl-4-Phenylpyridinium (MPP+) - related compounds in rat pheochromocytoma PC12 cells.
Journal Formal name:Archives of biochemistry and biophysics
Abbreviation:Arch. Biochem. Biophys.
ISSN code:0003-9861
Volume, Issue, Page 337(1),75-80頁
Author and coauthor Kang Dongchon, Miyako Kenichi, Kuribayashi Futoshi, Hasegawa Eiji, Athushi Mitsumoto, Nagano Tetsuo, Takeshige Koichiro.
Publication date 1997/01
Summary We examined effects of three structurally related pyridinium compounds, 1-methyl-4-phenylpyridinium (MPP+), paraquat, and 1-methyl-4-(4'-nitrophenyl) pyridinium (analog 1), on the energy metabolism in pheochromocytoma PC12 cells. MPP+ inhibited the intracellular NADH oxidation by the mitochondrial respiratory chain, judging from the decrease of the cytosolic NAD+/NADH ratio. Paraquat enhanced the oxidation of NADH and decreased intracellular ATP more than MPP+. The inhibition of the mitochondrial respiration by MPP+ was partially compensated by enhanced glycolysis, while paraquat inhibited glycolysis at the level of hexokinase probably due to the intracellular production of oxygen radicals. Analog 1 moderately enhanced glycolysis, moderately increased a cytosolic ratio of NAD+/NADH, and caused only a slight decline of intracellular ATP. Paraquat was the most cytotoxic of the three compounds. Thus, the three structurally related compounds, MPP+, paraquat, and analog 1, showed different effects on the mitochondrial respiratory chain and the glycolytic pathway in PC 12 cells. Their properties found in the cells well reflected those obtained by using bovine heart submitochondrial particles.