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Related Concept Videos

Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...

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Related Experiment Video

Updated: May 25, 2026

Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
07:52

Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents

Published on: June 2, 2015

Positive feedback induced memory effect in ischemic preconditioning.

Jichen Shi1, Jian Xu, Xiaorong Zhang

  • 1School of Mathematical Sciences, Soochow University, Suzhou, Jiangsu 215006, PR China.

Journal of Theoretical Biology
|February 11, 2012
PubMed
Summary
This summary is machine-generated.

Ischemic preconditioning memory, a protective effect lasting days, is explained by intra-mitochondrial positive feedback. Stronger feedback mechanisms lead to longer memory duration, offering robust cardioprotection.

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10:13

Experimental Models to Study the Neuroprotection of Acidic Postconditioning Against Cerebral Ischemia

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Cellular Signaling

Background:

  • Ischemic preconditioning (IP) confers a protective effect against ischemia-reperfusion injury.
  • The memory of IP, a sustained protection lasting up to 3 days, is not fully understood.
  • Existing theories attribute IP memory to feed-forward signaling cascades.

Purpose of the Study:

  • To investigate the role of intra-mitochondrial positive feedback in sustaining the memory of ischemic preconditioning.
  • To mathematically model the relationship between positive feedback and memory duration.
  • To compare the efficacy of positive feedback mechanisms with feed-forward cascades.

Main Methods:

  • Development of a mathematical model to simulate intra-mitochondrial positive feedback.
  • Analysis of hysteresis response within the positive feedback loop.
  • Derivation of an explicit relationship between feedback strength and memory duration.

Main Results:

  • Positive feedback, utilizing hysteresis, can effectively prolong cardioprotection indefinitely.
  • A direct correlation exists: stronger positive feedback leads to longer memory duration.
  • Positive feedback mechanisms demonstrate superior robustness and efficiency compared to feed-forward cascades.

Conclusions:

  • Intra-mitochondrial positive feedback is a viable mechanism for sustaining the memory of ischemic preconditioning.
  • The strength of positive feedback directly dictates the duration of cardioprotective memory.
  • These findings have significant implications for developing novel therapeutic strategies and experimental approaches in cardiovascular medicine.