Function of the mitochondrial outer membrane as a diffusion barrier in health and diseases.

Abstract:

:The mitochondrial outer membrane separates the intermembrane space from the cytosol. The whole exchange of metabolites, cations and information between mitochondria and the cell occurs through the outer membrane. Experimental evidence is reviewed supporting the hypothesis of dynamic ADP compartmentation within the intermembrane space. The outer membrane creates a diffusion barrier for small molecules (adenine nucleotides, creatine phosphate, creatine etc.) causing rate-dependent concentration gradients as a prerequisite for the action of ADP shuttles via creatine kinases or adenylate kinases. If the outer membrane becomes leaky, cytochrome c and apoptosis-inducing factor can be released, leading to apoptosis, and as a bioenergetic consequence the cytosolic phosphorylation potential decreases. Leaky outer membranes can be detected in saponin-skinned fibres with spectrophotometric and oxygraphic methods. This is of special interest in respect to acute impairment of mitochondria during ischaemia/reperfusion.

journal_name

Biochem Soc Trans

authors

Gellerich FN,Trumbeckaite S,Opalka JR,Seppet E,Rasmussen HN,Neuhoff C,Zierz S

doi

10.1042/bst0280164

keywords:

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

164-9

issue

2

eissn

0300-5127

issn

1470-8752

journal_volume

28

pub_type

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