Inhibition of respiration in mitochondria and in digitonin-treated rat hepatocytes by podophyllotoxin.

Abstract:

:The effects of the microtubular inhibitor, podophyllotoxin, on mitochondrial respiration were determined using isolated, digitonin-permeabilized hepatocytes and isolated mitochondria. In hepatocytes, podophyllotoxin (1.5 mM) inhibited coupled and uncoupled respiration of both FAD and NAD-linked substrates. In mitochondria, podophyllotoxin inhibited State III respiration, prevented the return to State IV respiration, and inhibited uncoupled respiration. There was no inhibition of ascorbate/TMPD oxidation in either the hepatocytes or the mitochondria. Podophyllotoxin had no effect upon oligomycin inhibition of coupled respiration. Oligomycin had no effect on the podophyllotoxin-inhibition of uncoupled respiration in either hepatocytes or mitochondria. The results indicate that podophyllotoxin alters electron flow at a site early in the electron transport chain.

journal_name

Mol Cell Biochem

authors

Horrum MA,Jennett RB,Ecklund RE,Tobin RB

doi

10.1007/BF00219331

subject

Has Abstract

pub_date

1986-06-01 00:00:00

pages

79-85

issue

1

eissn

0300-8177

issn

1573-4919

journal_volume

71

pub_type

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