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Radical Reactivity: Nucleophilic Radicals

Radical Reactivity: Nucleophilic Radicals

Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For instance, consider...

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Strategies for Study of Neuroprotection from Cold-preconditioning

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Neuroprotection by radical avoidance: search for suitable agents.

Rüdiger Hardeland¹

¹Johann Friedrich Blumenbach Institute of Zoology and Anthropology, University of Göttingen, Berliner str. 28, D-37073 Göttingen, Germany. rhardel@gwdg.de

Molecules (Basel, Switzerland)

|December 25, 2009

Summary

Free radicals contribute to neurodegeneration, but targeting primary causes like calcium imbalance and mitochondrial issues is key. Melatonin and other compounds show promise in reducing free radical formation by addressing these root causes.

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Published on: September 2, 2010

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Targeted Neuronal Injury for the Non-Invasive Disconnection of Brain Circuitry

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Published on: September 27, 2020

Area of Science:

Neuroscience
Biochemistry
Pharmacology

Background:

Neurodegeneration is linked to free radical damage, but increased reactive oxygen and nitrogen species are often consequences, not primary causes.
Cellular dysfunctions, including calcium homeostasis disturbances, mitochondrial issues, and circadian system decline, initiate detrimental free radical formation.
Existing free radical scavengers are insufficient to manage high pathological levels, necessitating interventions at primary dysfunction sources.

Purpose of the Study:

To explore therapeutic strategies targeting the primary causes of free radical formation in neurodegeneration.
To evaluate interventions aimed at preventing calcium overload, mitochondrial dysfunction, and circadian disruption.
To compare the potential of various drugs, including L-theanine, nitrones, resveratrol, leptin, and melatonin, in mitigating free radical generation.

Main Methods:

Review of existing literature on neurodegeneration, free radical biology, and potential therapeutic agents.
Analysis of mechanisms by which cellular dysfunctions contribute to oxidative stress.
Comparative assessment of drug candidates based on their ability to address primary causes of free radical formation.

Main Results:

L-theanine and nitrones can counteract excitotoxicity and mitochondrial radical formation.
Resveratrol may promote mitochondrial biogenesis, while leptin can attenuate mitochondrial electron leakage.
Melatonin demonstrates broad efficacy by regulating antioxidant enzymes and addressing multiple primary causes, with good tolerability.

Conclusions:

Interventions focused on preventing primary cellular dysfunctions are more effective than solely relying on radical scavenging.
Melatonin emerges as a promising candidate due to its multifaceted action on key pathways involved in free radical generation.
Further research into these agents could lead to novel therapeutic approaches for neurodegenerative diseases.