Abstract
The expression of voltage-gated Ca2+ channels on astrocytes in culture has already been shown 20 years ago (MacVicar, 1984). A detailed investigation has recently identified a large variety of subtypes present in cultured cells, both on the protein and mRNA level, namely α1B (N-type), α1c (L-type), α1D (L-type), α1E (R-type), and α1G (T-type), but not α1A (P/Q-type) channels (Latour et al., 2003). The expression of Ca channels in astrocytes in situ is controversial. There was no evidence found for Ca2+ channels in astrocytes in acute slices from the visual cortex or the CA1 hippocampal region of developing rats and the depolarization-induced [Ca2+]i increases in astrocytes was solely attributed to the activation of metabotropic receptors by neurotransmitters, such as glutamate, released by synaptic terminals upon depolarization (Carmignoto et al., 1998). In contrast, freshly isolated astrocytes from 2–6 week old rat hippocampi showed verapamil-sensitive increases in Ca2+ due to depolarization by high K+ supporting the presence of voltage-gated Ca2+ channels (Fraser et al., 1995). For more details on Ca2+ channels see also Chapter 7.
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Abbreviations
- trans:
-
ACPD: (1S,3R)-1-Aminocyclopentane-1,3-dicarboxylic acid
- AMPA (R):
-
α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (receptor)
- BAPTA:
-
1,2-bis-(o-minophenoxy)ethanie-N,N,N’,N’-tetraacetic acid
- C5a, C3a:
-
Complement factor 5a, etc.
- [Ca2+]i :
-
Cytosolic free calcium concentration
- CaSK:
-
Calcium sensing receptor CCL21 Chemokine CCL21
- CCR:
-
Chemokine receptor binding CC type chemokines
- CNS:
-
Central nervous system
- CRAC:
-
Calcium release activated channel
- Cx:
-
Connexins, various gap junction proteins
- CXCR:
-
Chemokine receptor binding CXC type chemokines
- ET:
-
Endothelin
- GABA:
-
γ-amino butyric acid
- GABAARs GABAA :
-
receptors
- GluRs:
-
Glutamate receptors
- mGluRs:
-
Metabotropic glutamate receptors
- gp 120 HIV:
-
envelop glycoprotein 120
- IFN:
-
γ: Interferon gamma
- IL:
-
Interleukin
- InsP3(R):
-
Inositol trisphosphate (receptor)
- LPA:
-
Lysophosphatidic acid
- LPS:
-
Lipopolysaccharide
- MIP:
-
Macrophage inflammatory protein
- MRF:
-
microglial response factor
- NE:
-
Norepinephrine
- NMDA(R):
-
N-methyl-D-aspartate receptors
- NO:
-
Nitric oxide
- PAR:
-
Protease activated receptor
- PTX:
-
Pertussis toxin
- TNFα:
-
Tumor necrosis factor alpha
- TTX:
-
Tetrodotoxin
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Kettenmann, H., Schipke, C.G. (2004). Calcium signaling in glia. In: Hatton, G.I., Parpura, V. (eds) Glial ⇔ Neuronal Signaling. Springer, Boston, MA. https://doi.org/10.1007/978-1-4020-7937-5_12
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