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Related Concept Videos

Autophagy01:27

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Delivery Pathways to the Lysosome

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Chronic Obstructive Pulmonary Disease II: Emphysema01:23

Chronic Obstructive Pulmonary Disease II: Emphysema

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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Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure
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Autophagy in pulmonary diseases.

Stefan W Ryter1, Kiichi Nakahira, Jeffrey A Haspel

  • 1Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. sryter@partners.org

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Autophagy, a cellular recycling process, is crucial for maintaining cell health and responding to stress. This review explores its role in the development of various pulmonary diseases.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pathology

Background:

  • Autophagy is a fundamental cellular process involving the degradation of cellular components via lysosomes.
  • It plays a vital role in maintaining cellular homeostasis, organelle quality control (e.g., mitochondria), and survival during starvation.
  • Autophagy is an inducible response to cellular stress and influences key cellular functions like programmed cell death, proliferation, inflammation, and immunity.

Purpose of the Study:

  • To review the multifaceted roles of autophagy in the pathogenesis of pulmonary diseases.
  • To highlight the involvement of autophagy in pulmonary vascular disease and acute and chronic lung conditions.

Main Methods:

  • Literature review focusing on the intersection of autophagy and pulmonary disease.
  • Analysis of existing research on the mechanisms linking autophagic activity to lung pathology.

Main Results:

  • Autophagy's role in disease pathogenesis is complex and can involve either insufficient or excessive autophagic activity.
  • Dysregulation of autophagy and its regulatory proteins is implicated in the development of various human diseases.
  • Specific emphasis is placed on the contribution of autophagy to pulmonary vascular diseases and acute/chronic lung diseases.

Conclusions:

  • Autophagy is a critical player in the pathogenesis of pulmonary diseases, with its dysregulation contributing to disease development.
  • Understanding the precise role of autophagy in lung diseases is essential for developing targeted therapeutic strategies.
  • Further research is needed to elucidate the specific mechanisms by which autophagy influences pulmonary vascular and parenchymal diseases.