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Related Concept Videos

Chronic Obstructive Pulmonary Disease II: Emphysema01:23

Chronic Obstructive Pulmonary Disease II: Emphysema

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Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Related Experiment Video

Updated: Apr 21, 2026

Isolation of Mouse Respiratory Epithelial Cells and Exposure to Experimental Cigarette Smoke at Air Liquid Interface
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Cigarette smoke extract affects mitochondrial function in alveolar epithelial cells.

Korbinian Ballweg1, Kathrin Mutze1, Melanie Königshoff1

  • 1Comprehensive Pneumology Center (CPC), University Hospital Ludwig-Maximilians University, Helmholtz Zentrum München, Munich, Member of the German Center for Lung Research (DZL), Germany.

American Journal of Physiology. Lung Cellular and Molecular Physiology
|October 19, 2014
PubMed
Summary

Mild cigarette smoke exposure triggers mitochondrial hyperfusion in lung cells, an adaptive response that may paradoxically increase vulnerability to chronic obstructive pulmonary disease (COPD) pathogenesis.

Keywords:
chronic obstructive pulmonary diseaseemphysemaproteostasisstress-induced mitochondrial hyperfusion

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Area of Science:

  • Cell Biology
  • Pulmonary Medicine
  • Mitochondrial Dynamics

Background:

  • Cigarette smoke is a primary risk factor for chronic obstructive pulmonary disease (COPD).
  • Cellular stress from cigarette smoke activates oxidative stress and inflammatory pathways.
  • Mitochondrial fusion and fission dynamics are altered by cellular stress.

Purpose of the Study:

  • To investigate the mitochondrial response in alveolar epithelial cells to mild, non-toxic doses of cigarette smoke extract (CSE).
  • To characterize changes in mitochondrial morphology, gene expression, proteostasis, and function following CSE exposure.

Main Methods:

  • Treatment of murine lung epithelial (MLE)12 and primary mouse alveolar epithelial cells with CSE.
  • Analysis of mitochondrial morphology, expression of fusion/fission genes (e.g., mitofusin 2), mitochondrial proteostasis markers, membrane potential, and oxygen consumption.

Main Results:

  • CSE treatment induced significant mitochondrial hyperfusion in alveolar epithelial cells.
  • Increased expression of the mitochondrial fusion protein mitofusin 2 and elevated metabolic activity were observed.
  • No induction of mitochondrial unfolded protein response or mitophagy was detected, indicating intact mitochondrial proteostasis.

Conclusions:

  • Mitochondria in alveolar epithelial cells exhibit an adaptive prosurvival response to non-toxic CSE concentrations via hyperfusion.
  • This hyperfused state, while initially adaptive, may increase cellular vulnerability to sustained cigarette smoke exposure.
  • Cigarette smoke-induced mitochondrial hyperfusion could contribute to the pathogenesis of COPD.