L-Lactate transport into rat heart mitochondria and reconstruction of the L-lactate/pyruvate shuttle.

نویسندگان

  • Daniela Valenti
  • Lidia de Bari
  • Anna Atlante
  • Salvatore Passarella
چکیده

In vitro reconstruction of the L-lactate/pyruvate shuttle has been performed, which allows NADH oxidation outside rat heart mitochondria. Such a shuttle occurs due to the combined action of the novel mitochondrial L-lactate/pyruvate antiporter, which differs from the monocarboxylate carrier, and the mitochondrial L-lactate dehydrogenase. The rate of L-lactate/pyruvate antiport proved to regulate the shuttle in vitro.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Occurrence of the malate-aspartate shuttle in various tumor types.

The activity of the malate-aspartate shuttle for the reoxidation of cytoplasmic reduced nicotinamide adenine dinucleotide (NADH) by mitochondria was assessed in six lines of rodent ascites tumor cells (two strains of Ehrlich ascites carcinoma, Krebs II carcinoma, Novikoff hepatoma, AS-30D hepatoma, and L1210 mouse leukemia). All the tumor cells examined showed mitochondrial reoxidation of cytop...

متن کامل

Oxidation of reduced cytosolic nicotinamide adenine dinucleotide by the malate-aspartate shuttle in the K-562 human leukemia cell line.

The activity of the malate-aspartate shuttle for the reoxidation of reduced cytosolic nicotinamide adenine dinucleotide (NADH) by mitochondria was studied in a line of human myeloid leukemia cells (K-562). The tumor cells showed mitochondrial reoxidation of cytosolic NADH, as evidenced by the accumulation of pyruvate, when incubated aerobically with L-lactate. The involvement of the respiratory...

متن کامل

Role of mitochondrial lactate dehydrogenase and lactate oxidation in the intracellular lactate shuttle.

To evaluate the potential role of mitochondrial lactate dehydrogenase (LDH) in tissue lactate clearance and oxidation in vivo, isolated rat liver, cardiac, and skeletal muscle mitochondria were incubated with lactate, pyruvate, glutamate, and succinate. As well, alpha-cyano-4-hydroxycinnamate (CINN), a known monocarboxylate transport inhibitor, and oxamate, a known LDH inhibitor were used. Mito...

متن کامل

Lactate is always the end product of glycolysis

Through much of the history of metabolism, lactate (La(-)) has been considered merely a dead-end waste product during periods of dysoxia. Congruently, the end product of glycolysis has been viewed dichotomously: pyruvate in the presence of adequate oxygenation, La(-) in the absence of adequate oxygenation. In contrast, given the near-equilibrium nature of the lactate dehydrogenase (LDH) reactio...

متن کامل

The kinetics of transport of lactate and pyruvate into rat hepatocytes. Evidence for the presence of a specific carrier similar to that in erythrocytes.

Time courses of L-lactate and pyruvate uptake into isolated rat hepatocytes were measured in a citrate-based medium to generate a pH gradient (alkaline inside), by using the silicone-oil-filtration technique at 0 degrees C to minimize metabolism. At low concentrations of lactate and pyruvate (0.5 mM), transport was inhibited by over 95% by 5 mM-alpha-cyano-4-hydroxycinnamate, whereas at higher ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Biochemical journal

دوره 364 Pt 1  شماره 

صفحات  -

تاریخ انتشار 2002