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相关概念视频

Cholinergic Antagonists: Therapeutic Uses01:26

Cholinergic Antagonists: Therapeutic Uses

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Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal...
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Cholinergic Neurons: Neurotransmission01:23

Cholinergic Neurons: Neurotransmission

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+....
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Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

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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...
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Cholinergic Antagonists: Pharmacokinetics01:24

Cholinergic Antagonists: Pharmacokinetics

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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相关实验视频

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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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第6层是小鼠听觉皮层中胆固醇调节的枢纽.

Lucas G Vattino1,2, Kameron K Clayton1,2, Troy A Hackett3

  • 1Eaton-Peabody Laboratories, Massachusetts Eye and Ear, 243 Charles St, Boston, MA 02114, United States.

Cerebral cortex (New York, N.Y. : 1991)
|January 22, 2026
PubMed
概括

基本前脑胆能神经元 (BFCN) 通过不同的途径调节听觉皮层. 它们通过不同的受体激活第6层金字塔神经元 (L6-PNs) 和第1层抑制神经元 (L1-INs),影响大脑状态和感知.

关键词:
乙烯基胆是一种基本前脑的前脑.第六层:皮质体层神经元.通过神经调节进行神经调节.尼古丁性和肌肉性受体.

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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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科学领域:

  • 神经科学是一个神经科学.
  • 细胞神经科学 细胞神经科学
  • 系统神经科学 系统神经科学

背景情况:

  • 基本前脑胆能神经元 (BFCNs) 广泛刺激听觉皮层 (ACtx).
  • 乙胆 (ACh) 通过1层抑制神经元 (L1-INs) 上的尼古丁受体 (nAChRs) 快速调节皮质电路.
  • 在更深层的皮质层中BFCN的作用仍然不太清楚.

研究的目的:

  • 研究BFCN对更深层皮层的功能影响,特别是第6层金字塔神经元 (L6-PNs).
  • 确定参与L6-PNs的BFCN调制的特定乙胆受体.
  • 为了阐明BFCN用于皮层电路调制的并行路径.

主要方法:

  • 多复杂的 in situ 标签,以分析在皮层层和细胞类型中的受体表达.
  • 在体内光遗传激活BFCN轴突以研究不同皮层神经元反应.
  • 急性切片电生理学记录BFCN激活后L6-PNs中的后突触潜力.

主要成果:

  • 第6层金字塔神经元 (L6-PNs) 表达不同的尼古丁性 (nAChR) 和肌肉性 (mAChR) 乙胆受体子单元.
  • 光遗传BFCN激活导致了2-6层的持续调制,但特别是在L6层的快速阶段激活.
  • 在L6-PNs中,BFCN激活引起了快速的nAChR介导激发和较慢的mAChR介导抑制.

结论:

  • BFCN通过不同的途径调节皮质电路,涉及L1-INs和刺激性L6-PNs.
  • 胆固醇控制涉及并行路径,将快速的,短暂的调制与更慢的,持续的调节合起来.
  • 这些平行通路通过差异性受体和电路参与来塑造皮质感知和可塑性.