IBMM, UMR 5247 CNRS, Université de Montpellier, ENSCM, 1919 Route de Mende, 34293 Montpellier, France.
Published: May 2022
AI Article Synopsis
Article Abstract
Several mutations on neuronal voltage-gated Ca channels (VGCC) have been shown to cause neurological disorders and contribute to the initiation of epileptic seizures, migraines, or cerebellar degeneration. Analysis of the functional consequences of these mutations mainly uses heterologously expressed mutated channels or transgenic mice which mimic these pathologies, since direct electrophysiological approaches on brain samples are not easily feasible. We demonstrate that mammalian voltage-gated Ca channels from membrane preparation can be microtransplanted into oocytes and can conserve their activity. This method, originally described to study the alteration of GABA receptors in human brain samples, allows the recording of the activity of membrane receptors and channels with their native post-translational processing, membrane environment, and regulatory subunits. The use of hippocampal, cerebellar, or cardiac membrane preparation displayed different efficacy for transplanted Ca channel activity. This technique, now extended to the recording of Ca channel activity, may therefore be useful in order to analyze the calcium signature of membrane preparations from unfixed human brain samples or normal and transgenic mice.
The complex pathology of Parkinson's disease (PD) requires comprehensive understanding and multi-pronged interventions for communication between nerve cells. Despite new developments in nanotechnology in the treatment of PD, in-depth exploration of their biological effects, in particular, the specific mechanisms of inflammation inhibition are lacking. Herein, using the stable cascade catalysis channel formed by polydopamine (PDA), imidazole groups, and Cu ions, a microgel system comprising functional monomers [superoxide dismutase (SOD) with double bonds, PDA, 2-methacryloyloxy ethyl phosphorylcholine (MPC), and Cu ions] is proposed for managing PD.
Allergic inflammation is closely related to the activation of mast cells (MCs), which is regulated by its intracellular Ca level, but the intake and effects of the intracellular Ca remain unclear. The Ca influx is controlled by members of Ca channels, among which calcium voltage-gated channel subunit alpha1 C (Ca1.2) is the most robust.
Objective: Resistance to antiseizure medications (ASMs) is a major challenge in the treatment of patients with epilepsy. Despite numerous newly marketed ASMs, the proportion of drug-resistant people with epilepsy has not significantly decreased over the years. Therefore, novel and innovative seizure models for preclinical drug screening are highly desirable.
Two-pore domain, outwardly rectifying potassium (TOK) channels are exclusively expressed in fungi. Human fungal pathogen TOK channels are potential antifungal targets, but TOK channel modulation in general is poorly understood. Here, we discovered that TOK (CaTOK) is regulated by extracellular pH, in contrast to TOK channels from other fungal species tested.
Introduction: Carbonated water (CarbW) affects the swallowing function associated with the action of the brainstem. In addition, CarbW ingestion promotes mean blood flow in the middle cerebral artery, which is associated with blood flow to the frontal and temporal lobes. In this milieu, studies regarding the effect of drinking CarbW on brain activity are of significance.
