使用星座药理学来表征来自Conus ateralbus的新型α-Conotoxin
Jorge L B Neves1,2, Cristoval Urcino2, Kevin Chase2
1Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR-LA), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal.
Marine drugs
|March 27, 2024
概括
我们发现了一种新的α-conotoxin (αCtx-AtIA) 来自Conus ateralbus,可以选择性地准α7尼古丁性乙胆受体 (nAChRs). 这种显示出研究nAChRs和相关神经疾病的潜力.
科学领域:
- 生物化学 生物化学
- 神经科学是一个神经科学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 螺的毒液含有针对离子通道和受体的生物活性.
- α-Conotoxins (αCtx) 是研究尼古丁乙胆受体 (nAChRs) 和它们在神经疾病中的作用的关键工具.
研究的目的:
- 发现和描述一个新的α-conotoxin,αCtx-AtIA,来自*Conus ateralbus*.
- 为了研究αCtx-AtIA的nAChR亚型选择性概况.
- 为了确定有助于αCtx-AtIA活动的关键残留物.
主要方法:
- 合成αCtx-AtIA及其类似物.
- 基于成像的星座药理学对小鼠DRG神经元的测定.
- 两电极电压对表达特定小鼠nAChR亚型 (α3β4,α6/α3β4,α7) 的卵细胞的电生理学.
主要成果:
- αCtx-AtIA在α7 nAChRs中选择性抑制了ACh诱导的流入,特别是使用全调节器PNU-120596.6.
- αCtx-AtIA对α3β4和α6/α3β4nAChRs的效力较低.
- 与αCtx-PeIA相比,αCtx-AtIA证明了对α7nAChRs的强度和选择性得到改善.
- 已确定Trp18残留物对αCtx-AtIA的活性至关重要.
结论:
- αCtx-AtIA是一种新型α-毒素,对α7 nAChRs具有很高的选择性.
- 这种共毒毒素是α7 nAChR研究的宝贵药理工具.
- 了解αCtx-AtIA与nAChRs的相互作用可以进一步了解nAChR相关的神经疾病.
更多相关视频
相关概念视频
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
2.2K
Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
2.2K
The Two-State Receptor Model
1.9K
The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
The binding affinity of a drug determines its interaction with...
1.9K
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
954
Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
The direct-acting...
954
Drug-Receptor Interaction: Agonist
2.5K
Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous...
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous...
2.5K
Cholinergic Receptors: Nicotinic
2.7K
Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
2.7K
Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action
1.8K
Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
1.8K


