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Ionic storm in hypoxic/ischemic stress: can opioid receptors subside it?
1Yale University School of Medicine, Department of Pediatrics, New Haven, CT 06520, USA.
Progress in Neurobiology
|December 29, 2009
Summary
Activation of delta-opioid receptors (DOR) protects neurons from oxygen deprivation by maintaining ionic balance. DOR signaling inhibits sodium influx and calcium increase, crucial for neuronal survival during hypoxic/ischemic stress.
Area of Science:
- Neuroscience
- Cellular Biology
- Neuroprotection
Background:
- Mammalian neurons are highly susceptible to oxygen deprivation and blood supply insufficiency, leading to hypoxic/ischemic encephalopathy.
- Hypoxia/ischemia disrupts neuronal ionic homeostasis, causing ion influx/efflux and subsequent injury or death.
- Opioid receptor activation, particularly delta-opioid receptors (DOR), demonstrates neuroprotective effects against hypoxic/ischemic damage.
Purpose of the Study:
- To review the mechanisms by which delta-opioid receptors (DOR) protect neurons against hypoxic/ischemic insults.
- To elucidate the role of DOR in maintaining ionic homeostasis during oxygen deprivation.
- To discuss the signaling pathways underlying DOR-mediated neuroprotection.
Main Methods:
- Review of existing literature on hypoxic/ischemic injury and opioid receptor function.
- Analysis of experimental data on DOR activation and its effects on neuronal ion transport.
- Exploration of signaling pathways, including protein kinase C (PKC) and protein kinase A (PKA).
Main Results:
- DOR activation is neuroprotective against hypoxic/ischemic stress.
- DOR signaling counteracts the disruption of ionic homeostasis by inhibiting sodium influx and reducing intracellular calcium increase.
- DOR-mediated protection involves a PKC-dependent and PKA-independent pathway and regulates sodium channels.
Conclusions:
- Delta-opioid receptors (DOR) play a critical role in neuronal survival under hypoxic/ischemic conditions.
- DOR activation preserves ionic homeostasis, mitigating neuronal injury caused by oxygen deprivation.
- Targeting DOR represents a potential therapeutic strategy for hypoxic/ischemic encephalopathy.
Keywords:
Ca2+ channelsK+ channelsNa+ channelshypoxia/ischemiaionic homeostasisneuroprotectionopioidsδ-opioid receptorMore Related Videos
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