The Impact of Altered HCN1 Expression on Brain Function and Its Relationship with Epileptogenesis.
1. Curr Neuropharmacol. 2023;21(10):2070-2078. doi: 10.2174/1570159X21666230214110333. The Impact of Altered HCN1 Expression on Brain Function and Its Relationship with Epileptogenesis. Zhao K(1), Li Y(1), Yang X(2), Zhou L(1). Author information: (1)Department of Neurology, The Seventh Affliated Hospital of Sun Yet-sen University, No. 628, Zhenyuan Road, Xinhu Street, Guangming District, Shenzhen, China. (2)Guangzhou Laboratory, Guangzhou, No. 9 XingDaoHuanBei Road, Guangzhou International Bio Island, Guangzhou 510005, Guangdong Province, China. Hyperpolarization-activated cyclic nucleotide-gated cation channel 1 (HCN1) is predominantly expressed in neurons from the neocortex and hippocampus, two important regions related to epilepsy. Both animal models for epilepsy and epileptic patients show decreased HCN1 expression and HCN1-mediated Ih current. It has been shown in neuroelectrophysiological experiments that a decreased Ih current can increase neuronal excitability. However, some studies have shown that blocking the Ih current in vivo can exert antiepileptic effects. This paradox raises an important question regarding the causal relationship between HCN1 alteration and epileptogenesis, which to date has not been elucidated. In this review, we summarize the literature related to HCN1 and epilepsy, aiming to find a possible explanation for this paradox, and explore the correlation between HCN1 and the mechanism of epileptogenesis. We analyze the alterations in the expression and distribution of HCN1 and the corresponding impact on brain function in epilepsy. In addition, we also discuss the effect of blocking Ih on epilepsy symptoms. Addressing these issues will help to inspire new strategies to explore the relationship between HCN1 and epileptogenesis, and ultimately promote the development of new targets for epilepsy therapy. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net. DOI: 10.2174/1570159X21666230214110333 PMCID: PMC10556362 PMID: 37366350 [Indexed for MEDLINE] Conflict of interest statement: The authors declare no conflict of interest, financial or otherwise.
