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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.
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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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An In-House-Built and Light-Emitting-Diode-Based Photodynamic Therapy Device for Enhancing Verteporfin Cytotoxicity in a 2D Cell Culture Model
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Photodynamic therapy and cell death pathways.

David Kessel1, Nancy L Oleinick

  • 1Wayne State University School of Medicine, Detroit, MI, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 17, 2010
PubMed
Summary
This summary is machine-generated.

Photodynamic therapy (PDT) can trigger both apoptosis and autophagy in cells. This study quantifies the relationship between PDT dose, cell survival, and the extent of these cell death pathways.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Photomedicine

Background:

  • Photodynamic therapy (PDT) involves photosensitized cells irradiated to cause phototoxic effects.
  • PDT can induce both apoptosis (programmed cell death) and autophagy (cellular self-degradation).

Purpose of the Study:

  • To characterize the dose-dependent relationship between PDT and cell survival in vitro.
  • To assess the apoptotic and autophagic responses to photodamage.

Main Methods:

  • Clonogenic assays were used to determine cell survival post-PDT.
  • Apoptosis was evaluated by observing condensed chromatin and activating caspases.
  • Autophagic flux was measured by LC3-II protein accumulation under varying autophagosome processing conditions.

Main Results:

  • Established a correlation between PDT dose and in vitro cell survival.
  • Quantified the extent of apoptosis and autophagy induced by photodamage.
  • Demonstrated distinct cellular responses to varying PDT doses.

Conclusions:

  • PDT induces both apoptosis and autophagy, with their extent correlating to the administered dose.
  • Understanding these pathways is crucial for optimizing PDT efficacy.
  • This research provides a framework for analyzing PDT-induced cell death mechanisms.