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Expression Patterns of TRPC1 in Cortical Lesions from Patients with Focal Cortical Dysplasia
Zhenle Zang1, Song Li1, Wei Zhang1
1Department of Neurosurgery, Xinqiao Hospital, Third Military Medical University, 183 Xinqiao Main Street, Shapingba District, Chongqing, 400037, China.
Abstract:
Focal cortical dysplasia (FCD) is known as a common cause of chronic refractory epilepsy, but the underlying mechanisms of the factors that lead to FCD-related epilepsy are unclear. Previous studies have shown that canonical transient receptor potential channels (TRPCs) might be involved in the process of epileptogenesis. Canonical transient receptor potential channel 1 (TRPC1), which is ubiquitously expressed in the brain, has been shown to be involved in epileptiform bust firing in knockout mice. In this study, we examined the expression of TRPC1 in FCD type Ia (FCDIa), FCD type IIa (FCDIIa), and FCD type IIb (FCDIIb) surgical specimens from patients and age-matched autopsy control samples. Real-time quantitative PCR and western blotting indicated that TRPC1 mRNA and protein levels were increased in FCDIa, FCDIIa, and FCDIIb samples compared to control samples. Immunohistochemistry results revealed that TRPC1 was mainly distributed in microcolumns, dysmorphic neurons, and balloon cells. Further double immunofluorescent staining showed that TRPC1 was co-localized with glutamatergic and GABAergic markers. Taken together, our results demonstrate that the overexpression and specific cellular location of TRPC1 might be related to the epileptogenesis of FCD.
Insights
Canonical transient receptor potential channel 1 (TRPC1) is overexpressed in focal cortical dysplasia (FCD) brain tissue. This suggests TRPC1 may play a role in FCD-related epilepsy development.
Area of Science:
- Neuroscience
- Molecular Biology
- Epilepsy Research
Background:
- Focal cortical dysplasia (FCD) is a leading cause of intractable epilepsy.
- The molecular mechanisms driving FCD-associated epileptogenesis remain largely unknown.
- Canonical transient receptor potential channels (TRPCs) are implicated in neuronal excitability and epilepsy.
Purpose of the Study:
- To investigate the expression and cellular localization of Canonical transient receptor potential channel 1 (TRPC1) in different types of FCD.
- To determine the potential role of TRPC1 in the epileptogenesis of FCD.
Main Methods:
- Analysis of TRPC1 mRNA and protein levels in FCD surgical specimens (FCDIa, FCDIIa, FCDIIb) and control samples using real-time quantitative PCR and Western blotting.
- Immunohistochemistry to determine TRPC1 distribution in FCD tissues.
- Double immunofluorescent staining to assess TRPC1 co-localization with neuronal markers.
Main Results:
- TRPC1 mRNA and protein levels were significantly elevated in all FCD subtypes compared to controls.
- TRPC1 was predominantly localized in microcolumns, dysmorphic neurons, and balloon cells within FCD tissues.
- TRPC1 showed co-localization with both glutamatergic and GABAergic markers.
Conclusions:
- Overexpression of TRPC1 in FCD tissues suggests its involvement in the pathogenesis of FCD-related epilepsy.
- The specific cellular localization of TRPC1 in key FCD cellular abnormalities points to its functional role in epileptogenesis.
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