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Cellular Injury V: Apoptosis and Autophagy01:22

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...
Overview of Cell Death01:30

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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...
Apoptosis01:30

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
Cellular Injury IlI: Cellular Death01:11

Cellular Injury IlI: Cellular Death

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...
Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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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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Use of LysoTracker to Detect Programmed Cell Death in Embryos and Differentiating Embryonic Stem Cells
12:44

Use of LysoTracker to Detect Programmed Cell Death in Embryos and Differentiating Embryonic Stem Cells

Published on: October 11, 2012

Cell death in mammalian development.

C Penaloza1, S Orlanski, Y Ye

  • 1Department of Biology, Queens College and Graduate Center of the City University of New York, Flushing, New York 11367, USA.

Current Pharmaceutical Design
|January 29, 2008
PubMed
Summary
This summary is machine-generated.

Cell death is crucial for embryonic development, shaping organs and preventing anomalies. Understanding the genetic regulation of cell death pathways is key to comprehending developmental processes.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Cell death is a fundamental process during embryogenesis, essential for proper tissue organization and organogenesis.
  • Aberrations in the timing, extent, or pattern of cell death can result in significant developmental abnormalities.

Purpose of the Study:

  • To review the types and distribution of cell death in developing mammalian embryos.
  • To discuss the gene products that regulate these cell death processes.

Main Methods:

  • This review synthesizes existing research on cell death during mammalian embryonic development.
  • It examines observations linking genetic regulation to cell death pathways.

Main Results:

  • Cell death plays a critical role in sculpting the embryo and determining organ function.
  • Genetic studies reveal that while some gene product alterations have no effect, others profoundly impact development.

Conclusions:

  • Understanding the diverse pathways of cell death and their genetic regulators is vital for deciphering developmental control.
  • Further research into these pathways can illuminate the mechanisms underlying developmental anomalies.