Abstract
Cell death after stroke involves apoptotic, autophagocytic and necrotic mechanisms which may cause the release of cytosolic proteins to the extracellular space. Aldolase C (AldC) is the brain specific isoform of the glycolytic enzyme fructose-1,6-bisphosphate aldolase. According to its characteristic striped expression pattern in the adult cerebellum AldC is also termed zebrin II. Here, we demonstrate release of AldC into the cerebrospinal fluid (CSF) after stroke in vivo. Studies with cell cultures confirmed that AldC is released to the extracellular space after hypoxia. Moreover, addition of purified recombinant AldC to networks of cortical neurons plated on multielectrode arrays reversibly inhibited the spontaneous generation of action potentials at AldC concentrations which can be expected to occur after lesions of the human cerebral cortex. This mechanism could be relevant in the pathogenesis of the electrophysiological changes in the penumbra region after stroke.
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Abbreviations
- ABTS:
-
2,2′-Azino-bis(3-ethylbenzthiazoline-6-sulfonic acid)
- A.d.:
-
Aqua dest (H2O)
- AldA:
-
Aldolase A
- AldB:
-
Aldolase B
- AldC:
-
Aldolase C
- BSA:
-
Bovine serum albumin
- CSF:
-
Cerebrospinal fluid
- DTT:
-
Dithiothreitol
- ECL:
-
Enhanced chemiluminescence
- FBP:
-
Fructose-1,6-bisphosphate
- GAP:
-
Glycerinaldehyde-3-phosphate
- GDH:
-
Glycerol-3-phosphate-dehydrogenase
- IPTG:
-
Isopropyl-β-d-thiogalactopyranosid
- kDa:
-
kilo Dalton
- LB:
-
Luria Bertani
- MRI:
-
Magnetic resonance imaging
- PBS:
-
Phosphate buffered saline
- PMSF:
-
Phenyl methyl sulfonyl fluoride
- RT:
-
Room temperature
- SDS-PAGE:
-
Sodium dodecylsulfate-polyacrylamide gel electrophoresis
- TBS:
-
Tris buffered saline
- TIM:
-
Triose-phosphate-isomerase
- TTX:
-
Tetrodotoxin
- WB:
-
Western blot
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Acknowledgments
We thank Norbert Rösel for excellent technical assistance and Prof. Richard Hawkes for the gift of the zebrin II antibody. This study was supported in part by the BMFZ of the Heinrich-Heine-University (Germany) and the Pinguin-Stiftung (Düsseldorf/Germany).
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Stephanie Linke and Philipp Goertz contributed equally.
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Linke, S., Goertz, P., Baader, S.L. et al. Aldolase C/Zebrin II is Released to the Extracellular Space after Stroke and Inhibits the Network Activity of Cortical Neurons. Neurochem Res 31, 1297–1303 (2006). https://doi.org/10.1007/s11064-006-9169-9
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DOI: https://doi.org/10.1007/s11064-006-9169-9