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Related Concept Videos

Overview of Cell Death01:30

Overview of Cell Death

Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
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Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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Cell death is the irreversible loss of cellular structure and function, representing the final stage of severe injury. It plays a key role in both normal physiology and disease.Types of Cell DeathThe two main types are necrosis and apoptosis, though others like necroptosis and pyroptosis also exist.Necrosis:Necrosis is an unregulated form of cell death caused by severe injury such as trauma, toxins, or ischemia. It is characterized by cell swelling, membrane loss, rupture, and leakage of...
Cellular Injury I: Introduction01:00

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Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...

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Cell sheet integrity and nanomechanical breakdown during programmed cell death.

Jiashan Wang1, Andrew E Pelling

  • 1Department of Physics, University of Ottawa, Ottawa, ON, Canada.

Medical & Biological Engineering & Computing
|June 11, 2010
PubMed
Summary
This summary is machine-generated.

Apoptosis involves nanomechanical changes. The extracellular matrix (ECM) reinforces cell monolayers during this process via fibronectin-actin interactions, preventing inflammatory disease pathogenesis.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Nanotechnology

Background:

  • Apoptosis is a vital physiological process crucial for organismal homeostasis and development.
  • While biochemically regulated, apoptosis also involves nanomechanical feedback between cellular signaling and the microenvironment.
  • Dysregulation of apoptotic nanomechanics can lead to inflammatory diseases due to premature cell debris release.

Purpose of the Study:

  • To investigate the nanomechanical changes during early apoptosis in human fibroblasts.
  • To examine the role of the extracellular matrix (ECM) in maintaining cell monolayer integrity during apoptosis.
  • To understand the molecular interactions that reinforce cell monolayers during apoptotic breakdown.

Main Methods:

  • Culturing human fibroblasts as single cells and monolayers.
  • Utilizing advanced techniques to probe nanomechanical properties during apoptosis.
  • Analyzing the interactions between the ECM components (fibronectin) and cellular structures (F-actin).

Main Results:

  • Human fibroblasts exhibit significant nanomechanical breakdown during early apoptosis.
  • The extracellular matrix (ECM) effectively maintains the integrity of cell monolayers.
  • Fibronectin-F-actin interactions (fibronexus junctions) reinforce cell monolayers during apoptotic breakdown.

Conclusions:

  • Apoptosis is a nanomechanical process influenced by the cellular microenvironment.
  • The ECM plays a critical role in regulating the breakdown of apoptotic cells, particularly in maintaining tissue structure.
  • Understanding these nanomechanical aspects of apoptosis offers new insights into preventing inflammatory diseases.