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Nuclear Stability03:18

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
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Related Experiment Video

Updated: Jan 27, 2026

Hypoxic Preconditioning of Marrow-derived Progenitor Cells As a Source for the Generation of Mature Schwann Cells
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Hypoxic Preconditioning of Marrow-derived Progenitor Cells As a Source for the Generation of Mature Schwann Cells

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Müller Cells Stabilize Microvasculature through Hypoxic Preconditioning.

Kepeng Ou1,2, Sonja Mertsch1, Sofia Theodoropoulou2

  • 1Laboratory for Experimental Ophthalmology, University of Düsseldorf, Düsseldorf, Germany.

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|March 29, 2019
PubMed
Summary

Hypoxic preconditioning of Müller cells protects retinal endothelial cells by suppressing HIF-1α activation. This finding offers a novel therapeutic strategy for preventing vision loss caused by retinal neovascularization.

Keywords:
AngiogenesisHypoxiaHypoxic preconditioningMüller cellsVascular permeability

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Isolation of Primary Mouse Retinal Glial Müller Cells
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Isolation of Primary Mouse Retinal Glial Müller Cells
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Isolation of Primary Mouse Retinal Glial Müller Cells

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Background:

  • Retinal hypoxia drives vision loss via ischemia and neovascularization.
  • Müller cells are crucial for retinal neurovascular unit stability.
  • Hypoxia-inducible factor 1-alpha (HIF-1α) activation contributes to pathological angiogenesis.

Purpose of the Study:

  • To test if Müller cells stabilize the neurovascular unit by suppressing HIF-1α activation.
  • To investigate the protective mechanisms of hypoxic preconditioning in Müller cells.
  • To explore the role of Müller cells in regulating retinal vascular integrity.

Main Methods:

  • Tube formation and vascular permeability assays assessed angiogenesis.
  • Seahorse XF assay measured mitochondrial respiration.
  • Gene and protein expression analyzed via qRT-PCR, ELISA, and Western blot.

Main Results:

  • Hypoxia induced proangiogenic factors VEGF and ANGPTL-4, increasing vascular permeability.
  • Hypoxic preconditioning of Müller cells attenuated HIF-1α activation.
  • This preconditioning inhibited mTOR and induced aerobic glycolysis, stabilizing endothelial cells.

Conclusions:

  • Hypoxic preconditioning of Müller cells protects endothelial cells.
  • Suppression of HIF-1α activation is a key protective mechanism.
  • This highlights a potential therapeutic target for vision-threatening retinal diseases.