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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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Isolating Intestinal Stem Cells from Adult Drosophila Midguts by FACS to Study Stem Cell Behavior During Aging
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Mitochondrial dynamics regulates Drosophila intestinal stem cell differentiation.

Hansong Deng1,2, Shigeo Takashima3,4, Manash Paul3,5

  • 11Shanghai East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, 20092 China.

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Summary

Mitochondrial fusion is crucial for stem cell differentiation. Disrupting fusion in Drosophila intestinal stem cells prevents differentiation, but this defect can be rescued by inhibiting fission or reducing reactive oxygen species (ROS).

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Mitochondrial Biology

Background:

  • Stem/progenitor cell differentiation involves increased mitochondrial mass and complexity.
  • Mitochondrial dynamics (fusion and fission) are vital for induced pluripotent stem cells (iPSCs) but their role in in vivo stem cell differentiation is unclear.

Purpose of the Study:

  • To investigate the role of mitochondrial dynamics, specifically fusion, in the in vivo differentiation of Drosophila intestinal stem cells (ISCs).

Main Methods:

  • Utilized Drosophila intestinal stem cells (ISCs) and RNA interference (RNAi) to manipulate mitochondrial dynamics (opa1 for fusion, Drp1 for fission).
  • Assessed mitochondrial membrane potential, ATP levels, reactive oxygen species (ROS) production, cell proliferation, apoptosis, and differentiation marker expression.
  • Employed ROS scavengers and genetic inhibition of fission to rescue differentiation defects.

Main Results:

  • Drosophila ISC differentiation is accompanied by continuous mitochondrial fusion.
  • Inhibition of mitochondrial fusion (opa1 RNAi) in ISCs led to reduced mitochondrial membrane potential, decreased ATP, and increased ROS.
  • Suppressed fusion resulted in a failure of progenitor cells to differentiate, with no effect on proliferation or apoptosis.
  • The differentiation defect was rescued by inhibiting mitochondrial fission (Drp1) or by using a ROS scavenger, which also down-regulated JNK activity.

Conclusions:

  • Mitochondrial fusion is essential for the developmental switch in stem cell fate during differentiation.
  • Mitochondrial dynamics, particularly fusion, play a critical role in regulating stem cell differentiation pathways.
  • ROS signaling, potentially mediated by JNK, is involved in the differentiation defects caused by impaired mitochondrial fusion.