Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release.
Epsilon toxin (ET) produced by C. perfringens types B and D is a highly potent pore-forming toxin. ET-intoxicated animals express severe neurological disorders that are thought to result from the formation of vasogenic brain edemas and indirect neuronal excitotoxicity. The cerebellum is a predilecti...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2010-09-01
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| Series: | PLoS ONE |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20941361/?tool=EBI |
| _version_ | 1811307534469824512 |
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| author | Etienne Lonchamp Jean-Luc Dupont Laetitia Wioland Raphaël Courjaret Corinne Mbebi-Liegeois Emmanuel Jover Frédéric Doussau Michel R Popoff Jean-Louis Bossu Jean de Barry Bernard Poulain |
| author_facet | Etienne Lonchamp Jean-Luc Dupont Laetitia Wioland Raphaël Courjaret Corinne Mbebi-Liegeois Emmanuel Jover Frédéric Doussau Michel R Popoff Jean-Louis Bossu Jean de Barry Bernard Poulain |
| author_sort | Etienne Lonchamp |
| collection | DOAJ |
| description | Epsilon toxin (ET) produced by C. perfringens types B and D is a highly potent pore-forming toxin. ET-intoxicated animals express severe neurological disorders that are thought to result from the formation of vasogenic brain edemas and indirect neuronal excitotoxicity. The cerebellum is a predilection site for ET damage. ET has been proposed to bind to glial cells such as astrocytes and oligodendrocytes. However, the possibility that ET binds and attacks the neurons remains an open question. Using specific anti-ET mouse polyclonal antibodies and mouse brain slices preincubated with ET, we found that several brain structures were labeled, the cerebellum being a prominent one. In cerebellar slices, we analyzed the co-staining of ET with specific cell markers, and found that ET binds to the cell body of granule cells, oligodendrocytes, but not astrocytes or nerve endings. Identification of granule cells as neuronal ET targets was confirmed by the observation that ET induced intracellular Ca(2+) rises and glutamate release in primary cultures of granule cells. In cultured cerebellar slices, whole cell patch-clamp recordings of synaptic currents in Purkinje cells revealed that ET greatly stimulates both spontaneous excitatory and inhibitory activities. However, pharmacological dissection of these effects indicated that they were only a result of an increased granule cell firing activity and did not involve a direct action of the toxin on glutamatergic nerve terminals or inhibitory interneurons. Patch-clamp recordings of granule cell somata showed that ET causes a decrease in neuronal membrane resistance associated with pore-opening and depolarization of the neuronal membrane, which subsequently lead to the firing of the neuronal network and stimulation of glutamate release. This work demonstrates that a subset of neurons can be directly targeted by ET, suggesting that part of ET-induced neuronal damage observed in neuronal tissue is due to a direct effect of ET on neurons. |
| first_indexed | 2024-04-13T09:06:00Z |
| format | Article |
| id | doaj.art-d8915b8ca71749f7a48be7d3dd3969ce |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T09:06:00Z |
| publishDate | 2010-09-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-d8915b8ca71749f7a48be7d3dd3969ce2022-12-22T02:52:59ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-09-0159e1304610.1371/journal.pone.0013046Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. Etienne LonchampJean-Luc DupontLaetitia WiolandRaphaël CourjaretCorinne Mbebi-LiegeoisEmmanuel JoverFrédéric DoussauMichel R PopoffJean-Louis BossuJean de BarryBernard PoulainEpsilon toxin (ET) produced by C. perfringens types B and D is a highly potent pore-forming toxin. ET-intoxicated animals express severe neurological disorders that are thought to result from the formation of vasogenic brain edemas and indirect neuronal excitotoxicity. The cerebellum is a predilection site for ET damage. ET has been proposed to bind to glial cells such as astrocytes and oligodendrocytes. However, the possibility that ET binds and attacks the neurons remains an open question. Using specific anti-ET mouse polyclonal antibodies and mouse brain slices preincubated with ET, we found that several brain structures were labeled, the cerebellum being a prominent one. In cerebellar slices, we analyzed the co-staining of ET with specific cell markers, and found that ET binds to the cell body of granule cells, oligodendrocytes, but not astrocytes or nerve endings. Identification of granule cells as neuronal ET targets was confirmed by the observation that ET induced intracellular Ca(2+) rises and glutamate release in primary cultures of granule cells. In cultured cerebellar slices, whole cell patch-clamp recordings of synaptic currents in Purkinje cells revealed that ET greatly stimulates both spontaneous excitatory and inhibitory activities. However, pharmacological dissection of these effects indicated that they were only a result of an increased granule cell firing activity and did not involve a direct action of the toxin on glutamatergic nerve terminals or inhibitory interneurons. Patch-clamp recordings of granule cell somata showed that ET causes a decrease in neuronal membrane resistance associated with pore-opening and depolarization of the neuronal membrane, which subsequently lead to the firing of the neuronal network and stimulation of glutamate release. This work demonstrates that a subset of neurons can be directly targeted by ET, suggesting that part of ET-induced neuronal damage observed in neuronal tissue is due to a direct effect of ET on neurons.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20941361/?tool=EBI |
| spellingShingle | Etienne Lonchamp Jean-Luc Dupont Laetitia Wioland Raphaël Courjaret Corinne Mbebi-Liegeois Emmanuel Jover Frédéric Doussau Michel R Popoff Jean-Louis Bossu Jean de Barry Bernard Poulain Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. PLoS ONE |
| title | Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. |
| title_full | Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. |
| title_fullStr | Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. |
| title_full_unstemmed | Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. |
| title_short | Clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release. |
| title_sort | clostridium perfringens epsilon toxin targets granule cells in the mouse cerebellum and stimulates glutamate release |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20941361/?tool=EBI |
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