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Related Concept Videos

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
Ischemic Stroke ll: Pathophysiology01:15

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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...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Ischemic Stroke l: Introduction01:15

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Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...

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Gathering Self-Initiated Rat Behavioral Data to Characterize Post-Stroke Deficits
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Published on: March 15, 2024

Time matters: Circadian effects on stroke pathophysiology.

Ester Licastro1,2, Rohan Mahesh Patil1,2,3, Yasin Eshraghi2,4

  • 1Division of Pharmacology, Department Neuroscience, School of Medicine, Federico II University of Naples, Naples, Italy.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|May 7, 2026
PubMed
Summary
This summary is machine-generated.

Circadian rhythms significantly impact ischemic brain damage, affecting treatment efficacy. Understanding these biological rhythms is crucial for improving stroke therapies and enhancing the translation of preclinical research to human clinical applications.

Keywords:
Strokebiomarkerscircadian rhythmimmune responsemetabolomicsingle cell

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Stroke Research

Background:

  • Ischemic brain damage severity varies depending on the time of day it occurs.
  • Discrepancies between nocturnal rodent models and diurnal humans regarding circadian rhythms may contribute to the 'lost in translation' crisis in stroke research.

Purpose of the Study:

  • To clarify the role of circadian rhythms in stroke.
  • To enhance the translatability of preclinical stroke studies.
  • To identify promising therapeutic strategies for stroke by examining biomarker and systemic biology changes.

Main Methods:

  • Review of recently published findings on circadian rhythms and stroke.
  • Analysis of changes in biomarkers and systemic biology following stroke induction in mice.
  • Investigation of metabolic responses to stroke in the brain, blood, and muscles.

Main Results:

  • Circadian rhythms influence the metabolic response to stroke.
  • Therapeutic efficacy for stroke appears greater during the rodent inactive phase.
  • Systemic biology and biomarker changes are observed following stroke, influenced by circadian timing.

Conclusions:

  • Studying circadian timing in stroke research is vital for improving treatment outcomes.
  • Aligning preclinical models with human circadian biology can enhance the translation of brain protective strategies.
  • Therapeutic interventions for stroke may be optimized by considering the time of day.