Mitochondrial Function in Lung Health and Disease pp 161-176 | Cite as
Mitochondrial Function in Lung Health and Disease
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Abstract
The mitochondrion is a membrane-enclosed organelle found in most eukaryotic cells. In addition to supplying cellular energy, mitochondria are involved in a range of other processes, such as signaling and cell death. The mitochondrion is able to sense PO2 throughout the progressive reduction of cytochrome c with increasing hypoxia. This information is converted into an increase in reactive oxygen species production at complex III that acts as cell signal. Such signal is believed to be responsible for phenomena such as hypoxic vasoconstriction, activation of HIF, and internalization of the sodium-potassium pump of the alveolar epithelium. Mitochondrial DNA mutations are frequent in cancer cells. These mutations lead to an impaired oxidative metabolism and to decreased susceptibility to apoptosis. These two features are needed for survival of the cancer cell. There are two major signaling pathways of apoptosis and one of them involves the mitochondria. Apoptosis plays an important role in most lung diseases in two different ways. First, failure to clear unwanted cells by apoptosis will prolong the inflammation; second, excessive apoptosis may cause diseases. Finally the skeletal muscle dysfunction associated with COPD involves the loss of oxidative capacity, mainly due to the loss of mitochondrial density.
Keywords
Apoptosis Mitochondria Permeability transition pore Electron transport chain Reactive oxygen species Hypoxic vasoconstriction Cell signaling Skeletal muscle dysfunction Remodeling HIF Mitochondrial DNA mutationsAbbreviations
- AMPK
AMP-activated protein kinase
- Apaf1
Apoptotic protease activating factor 1
- ATP
Adenosine triphosphate
- Bax
Bcl-2-associated X protein
- Bcl-2
B-cell lymphoma 2
- CD95
Cluster of differentiation 95
- Cl
Chlorine
- CoA
Coenzyme A
- COPD
Chronic obstructive pulmonary disease
- COX
Cytochrome c oxidase
- CS
Citrate synthase
- DNA
Deoxyribonucleic acid
- ENa
Amiloride-sensitive sodium channels
- FADD
Fas-associated death domain protein
- Fas
FAS receptor (FasR) also known as apoptosis antigen 1
- FasL
Fas ligand
- H2O2
Hydrogen peroxide
- HIF
Hypoxia-inducible factor
- HO-1
Heme oxygenase 1
- IMS
Intermembrane space
- IPF
Idiopathic pulmonary fibrosis
- mDNA
Mitochondrial DNA
- MPT
Mitochondrial permeability transition
- Na
Sodium
- NRS
Nitrosative reactive species
- O2
Molecular oxygen
- p53
Tumor protein 53
- PHD2
Prolyl hydroxylase domain-containing protein 2
- PO2
Oxygen pressure
- PTP
Permeability transition pore
- roGFP
Mutated variant of green fluorescent protein
- ROS
Reactive oxygen species
- SDH
Succinate dehydrogenase
- SMD
Skeletal muscle dysfunction
- SOD
Superoxide dismutase
- TNF
Tumor necrosis factor
- TRADD
TNF receptor-associated death domain
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