Abstract
Homeostasis is one of the most fundamental concepts in understanding the physiological functions of bodies as well as the pathophysiology of diseases, and in a global view of system biology, is also a vital guiding principle for medicine. Because of the particular importance of ionic environment in neuronal functions, ion homeostasis is the most fundamental mechanism among all the brain homeostasis regulations, and most of the functional activities of the brain are highly dependent on the dynamic and relatively steady state of ionic environment. The concentrations of ions are in dynamic balance under physiological conditions, which depend on the complicated, but elaborate, regulatory mechanisms. The δ-opioid receptor (DOR) regulates a diverse array of physiological functions. DOR and its cognate endogenous opioids are widely expressed throughout the central nervous system and have an extensive interaction with ion channels, receptors, and transporters. DOR can regulate the release of many neurotransmitters, modify neuronal electrical activities and synaptic plasticity, and thereby tightly regulates ion homeostasis in neural activities. In this chapter, we will focus on the regulation of homeostasis of the key cations such as Na+, K+, Ca2+ in the brain under physiological conditions and the role of DOR in such homeostatic regulation. Almost all the previous studies regarding DOR-mediated regulation of ionic homeostasis under normoxic condition focused on intracellular Ca2+ activity. Few studies highlighted the regulation of K+ and Na+ homeostasis despite the functional coupling of DOR with K+ channels and Na+ channels. Overall, the predominant effect of DOR activation on Ca2+ entry is inhibitory. However, some studies show either mobilization of intracellular Ca2+ or stimulation of Ca2+ entry with opioid activation. In general, DOR signaling is inhibitory to Na+ influx and K+ efflux. In regard to this issue, we have recently made the first finding that DOR activation and expression reduces Na+ currents by targeting voltage-sensitive Na+ channels. The DOR effects have been demonstrated to occur through activation of different kind of G proteins, including Gi, Go, and even Gs classes.
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Abbreviations
- [Ca2+]i:
-
Cytosolic free Ca2+ concentrations
- [Ca2+]o:
-
Extracellular Ca2+ concentrations
- [K+]e:
-
Extracellular K+ concentrations
- [K+]i:
-
Intracellular K+ concentrations
- [Na+]i:
-
Intracellular Na+ concentrations
- [Na+]o:
-
Extracellular Na+ concentrations
- ACSF:
-
Artificial cerebrospinal fluid
- AMPARs:
-
AMPA receptors
- BBB:
-
Blood-brain barrier
- CCCP:
-
Carbonyl cyanide m-chlorophenyl hydrazone
- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- DA:
-
Dopamine
- DAG:
-
Diacylglycerol
- DAT:
-
Dopamine transporter
- DOR:
-
δ-Opioid receptor
- DRG:
-
Dorsal root ganglion
- EAAT:
-
Excitatory amino acid transporter (glutamate transporter, also as GluT in Table 5.3)
- eGFP:
-
Enhanced green fluorescent protein
- EPSPs/EPSCs:
-
Excitatory postsynaptic potentials/currents
- ER:
-
Endoplasmic reticulum
- GAT:
-
GABA transporter
- GIRK channels:
-
G-protein-activated inwardly rectifying K+ channels
- GPCRs:
-
G protein-coupled receptors
- i.c.v:
-
Intracerebroventricular
- iGluRs:
-
Ionotropic glutamate receptors
- IKir :
-
Inwardly rectifying K+ currents
- IMM:
-
Inner mitochondrial membrane
- IP3 :
-
Inositol triphosphate
- IP3Rs:
-
IP3 receptors
- IPSCs:
-
Inhibitory postsynaptic currents
- ISEs:
-
Ion-selective electrodes
- KOR:
-
κ-Opioid receptor
- LTD:
-
Long-term depression
- LTP:
-
Long-term potentiation
- MAM:
-
Mitochondria-associated membrane
- MAPK:
-
Mitogen-activated kinase
- MCU:
-
Mitochondrial Ca2+ uniporter
- mNCX:
-
Mitochondrial Na+/Ca2+ exchanger
- MOR:
-
μ-Opioid receptor
- nAChRs:
-
Nicotinic acetylcholine receptors
- NCX:
-
Na+/Ca2+ exchanger
- NKCC:
-
Na+-K+-2Cl− cotransporter
- NMDARs:
-
NMDA receptors
- NMDG+ :
-
N-methyl-D-glucamine
- NMR:
-
Nuclear magnetic resonance
- OMM:
-
Outer mitochondrial membrane
- PAG:
-
Midbrain periaqueductal gray
- PBFI:
-
Potassium-binding benzofuran isophtalate
- PIP2 :
-
Phosphatidylinositol 4,5-bisphosphate
- PLC:
-
Phospholipase C
- PMCA:
-
Plasma membrane Ca2+-ATPase
- PTP:
-
Permeability transition pores
- ROCs:
-
Receptor-operated channels
- RYRs:
-
Ryanodine receptors
- SBFI:
-
Sodium-binding benzofuran isophtalate
- SERCA:
-
Sarco-endoplasmic reticular Ca2+ ATPase
- SNAP:
-
Soluble N-ethylmaleimide sensitive factor Attachment Protein
- SNARE:
-
SNAP REceptor
- SOCs:
-
Store-operated Ca2+ entry channels
- STIM:
-
Stromal interaction molecules
- TEA:
-
Tetraethylammonium
- TMA+ :
-
Tetramethylammonium
- TRPCs:
-
Transient receptor potential channels
- TTX:
-
Tetrodotoxin
- VGCCs:
-
Voltage-gated Ca2+ channels
- VGSCs:
-
Voltage-gated sodium channels
- WT:
-
Wild type
- ΔΨm:
-
Mitochondrial potential
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Acknowledgements
This work was supported by NIH (AT-004422, and HD-034852) and Vivian L Smith Neurologic Foundation.
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Chao, D., Xia, Y. (2015). The Role of δ-Opioid Receptors in Brain Ionic Homeostasis Under Physiological Condition. In: Xia, Y. (eds) Neural Functions of the Delta-Opioid Receptor. Springer, Cham. https://doi.org/10.1007/978-3-319-25495-1_5
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