Abstract
Epilepsy is a common and refractory neurological disorder, but the neuronal regulatory mechanisms of epileptogenesis remain largely unclear. Activity-dependent transcription of genes for neurotrophins such as brain-derived neurotrophic factor (BDNF) has been shown to promote epileptogenesis; however, little is known about factors that may act as intrinsic, homeostatic or counterbalancing mechanisms. Using rodent models, here we show that limbic seizure activity upregulated NRG1–ErbB4 signaling and that epileptogenesis was inhibited by infusing NRG1 intracerebrally but exacerbated by neutralizing endogenous NRG1 with soluble ErbB4 extracellular domain, by inhibiting ErbB4 activation or by deleting the Erbb4 gene. Furthermore, specific depletion of ErbB4 in parvalbumin-expressing interneurons abolished NRG1-mediated inhibition of epileptogenesis and promoted kindling progression, resulting in increased spontaneous seizures and exuberant mossy fiber sprouting. In contrast, depleting ErbB4 in CaMKIIα-positive pyramidal neurons had no effect. Thus, NRG1-induced activation of ErbB4 in parvalbumin-expressing inhibitory interneurons may serve as a critical endogenous negative-feedback mechanism to suppress limbic epileptogenesis.
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Acknowledgements
We thank M. Gassmann (University of Basel) for kindly supplying us with heart-rescued Erbb4−/− mice, C. Lai (Indiana University) for Erbb4loxP/loxP mice, S. Arber (University of Basel) for Pvalb-cre mice and G. Schütz (German Cancer Research Center) for Camk2a-iCre and Camk2a-CreER mice. We also thank T.-M. Gao (Southern Medical University) for help concerning transgenic mice and M. Sliwkowski (Genentech) for NRG1. We are grateful to J.O. McNamara and M.-M. Poo for their comments on this work. We also thank Y.-J. Xin, X.-Y. Feng, L. Huang, B. Lu and Y. Shen for their help on genotyping, animal models and histological experiments. This work was supported in part by grants from the 973 Program (2011CBA00407), National Natural Science Foundation of China (30925016; 31021063) and Chinese Academy of Sciences (XDA01020305) to Z.Q.X. and from the US National Institutes of Health to L.M.
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G.-H.T., Y.-Y.L. and Z.-Q.X. designed the project; G.-H.T., Y.-Y.L., X.-L.H. and D.-M.Y. performed the research; L.M. provided laboratory sources of reagents and transgenic mice. G.-H.T., Y.-Y.L., L.M. and Z.-Q.X. interpreted the data and wrote the paper.
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Tan, GH., Liu, YY., Hu, XL. et al. Neuregulin 1 represses limbic epileptogenesis through ErbB4 in parvalbumin-expressing interneurons. Nat Neurosci 15, 258–266 (2012). https://doi.org/10.1038/nn.3005
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DOI: https://doi.org/10.1038/nn.3005
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