Abstract
Astrocytes perform various homeostatic functions in the nervous system beyond that of a supportive or metabolic role for neurons. A growing body of evidence indicates that astrocytes are crucial for central respiratory chemoreception. This review presents a classical overview of respiratory central chemoreception and the new evidence for astrocytes as brainstem sensors in the respiratory response to hypercapnia. We review properties of astrocytes for chemosensory function and for modulation of the respiratory network. We propose that astrocytes not only mediate between CO2/H+ levels and motor responses, but they also allow for two emergent functions: (1) Amplifying the responses of intrinsic chemosensitive neurons through feedforward signaling via gliotransmitters and; (2) Recruiting non-intrinsically chemosensitive cells thanks to volume spreading of signals (calcium waves and gliotransmitters) to regions distant from the CO2/H+ sensitive domains. Thus, astrocytes may both increase the intensity of the neuron responses at the chemosensitive sites and recruit of a greater number of respiratory neurons to participate in the response to hypercapnia.
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Abbreviations
- 5-HT:
-
5-hydroxytryptamine (Serotonin)
- ACh:
-
Acetylcholine
- aCSF:
-
Artificial cerebrospinal fluid
- AMPAR:
-
α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor
- ANP:
-
Atrial natriuretic peptide
- ATP:
-
Adenosine triphosphate
- CA:
-
Carbonic anhydrase enzyme
- CCHS:
-
Central congenital hypoventilation syndrome
- CNS:
-
Central nervous system
- CNO:
-
Clozapine-N-oxide
- CO2 :
-
Carbon dioxide
- CNQX:
-
6-cyano-7-nitroquinoxaline-2,3-dione—competitive AMPA/kainate receptor antagonist
- cNTS:
-
Caudal nucleus tractus solitarius
- CSF:
-
Cerebrospinal fluid
- cVLM:
-
Caudal ventrolateral medulla
- cVRG:
-
Caudal ventral respiratory group
- Cx:
-
Connexins
- DRC:
-
Dorsal respiratory columns
- EPSP:
-
Excitatory postsynaptic potentials
- GABA:
-
γ-aminobutyric acid
- GFAP:
-
Glial fibrillary acidic protein
- KF:
-
Pontine Kölliker-Fuse nucleus
- KO:
-
Knock out
- LC:
-
Locus coeruleus
- LDT:
-
Laterodorsal tegmental nucleus
- LPBR:
-
Lateral parabrachial nucleus
- LTP:
-
Long-term potentiation
- mRVLM:
-
Medial portion of the rostral ventrolateral medulla
- MS:
-
Methionine sulfoximine
- NK1R:
-
Neurokinin 1 receptor
- NMDA:
-
N-methyl-D-aspartate
- NMDAR:
-
N-methyl-D-aspartate receptor
- NO:
-
Nitric oxide
- NTS:
-
Nucleus tractus solitarius
- PaCO2 :
-
Partial arterial pressure of carbon dioxide
- PCO2 :
-
Partial pressure of carbon dioxide
- PaO2 :
-
Partial arterial pressure of oxygen
- PF-LHA:
-
Perifornical-lateral hypothalamic area
- PNS:
-
Peripheral nervous system
- PPADS:
-
Pyridoxal-phosphate-6-azophenyl-2=,4=-disulfonate
- PPT:
-
Pedunculopontine tegmental nucleus
- preBötC:
-
PreBötzinger Complex
- ORX:
-
Orexin
- ORX-KO:
-
Prepro-orexin knockout mice
- RN:
-
Medullary raphe nucleus
- RPG:
-
Respiratory pattern generator
- RTN/pFRG:
-
Retrotrapezoid/parafacial respiratory group
- RVL:
-
Nucleus reticularis rostroventrolateralis
- RVLM:
-
Rostral ventrolateral medulla
- rVRG:
-
Rostral ventral respiratory group
- SERT:
-
Serotonin transporter
- SIDS:
-
Sudden infant death syndrome
- SP:
-
Substance P
- SSP-SAP:
-
Saporin–substance P conjugate
- TH:
-
Tyrosine hydroxylase
- TIRF:
-
Total internal reflection fluorescence
- TRH:
-
Thyrotropin releasing hormone
- TRP:
-
Channels Transient receptor potential channels
- TS-eEPSCs:
-
Tractus solitaries-evoked excitatory postsynaptic currents
- VLM:
-
Ventrolateral medullary surface
- VMS:
-
Ventral medullary surface
- VRC:
-
Ventral respiratory columns
- VRG:
-
Ventral respiratory group
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Acknowledgments
Support from Grants Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) #1130874 (JE), Comisión Nacional de Ciencia y Tecnología (CONICYT) #21140669 (MJ Olivares), Comisión Nacional de Ciencia y Tecnología (CONICYT) #21120594 (S Beltrán-Castillo). DICYT-USACH (JE).
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Eugenín León, J., Olivares, M.J., Beltrán-Castillo, S. (2016). Role of Astrocytes in Central Respiratory Chemoreception. In: von Bernhardi, R. (eds) Glial Cells in Health and Disease of the CNS. Advances in Experimental Medicine and Biology, vol 949. Springer, Cham. https://doi.org/10.1007/978-3-319-40764-7_6
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