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Related Concept Videos

Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
Stimulants01:29

Stimulants

Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

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...
CNS Depressants: Alcohol and Nicotine01:27

CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
Bias in Epidemiological Studies01:29

Bias in Epidemiological Studies

Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:

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Related Experiment Video

Updated: Jun 18, 2026

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
08:47

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Published on: February 10, 2012

Nicotine Versus Non-Nicotine Constituents in Neurodegenerative Risk: Evidence from Multivariable Mendelian

Tonghui Wang1, Man Wu2, Lan Liang2

  • 1Department of Epidemiology and Health Statistics, School of Public Health, Xi'an Jiaotong University, Health Science Center, Xi'an, Shaanxi, P.R. China.

Current Neuropharmacology
|June 17, 2026
PubMed
Summary

Nicotine exposure increases Alzheimer's disease risk but protects against tremor and early cognitive impairment. Non-nicotine tobacco compounds also pose risks for cognitive decline.

Keywords:
Alzheimer’s diseaseMendelian randomizationParkinson’s disease.amyotrophic lateral sclerosisnicotine

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Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
10:04

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Related Experiment Videos

Last Updated: Jun 18, 2026

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
08:47

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Published on: February 10, 2012

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
10:04

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Area of Science:

  • Neuroscience
  • Genetics
  • Epidemiology

Background:

  • Nicotine's complex effects on nicotinic acetylcholine receptors are known, but its independent role in neurodegenerative diseases is unclear due to confounding factors in tobacco smoke.
  • The rise of electronic nicotine delivery systems necessitates a clearer understanding of nicotine's specific impact on neurological health.
  • Mendelian randomization was employed to disentangle the effects of nicotine from other tobacco toxicants.

Purpose of the Study:

  • To genetically differentiate the causal effects of nicotine exposure from non-nicotine smoking-related factors on major neurodegenerative diseases.
  • To investigate the impact of nicotine and non-nicotine constituents on Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, tremor, and cognitive impairment.

Main Methods:

  • Utilized univariable and multivariable Mendelian randomization (MR) analyses.
  • Employed summary-level data for cigarettes per day (CPD) and nicotine metabolite ratio (NMR) against individual-level, smoking-stratified UK Biobank data (n=337,334).
  • Assessed causal effects on six neurodegenerative outcomes: Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis (ALS), tremor, early cognitive impairment (EC), and other neurodegenerative diseases (OND).

Main Results:

  • Nicotine exposure was identified as a causal risk factor for Alzheimer's disease (AD) in both ever and current smokers.
  • Nicotine demonstrated a causal protective effect against tremor and early cognitive impairment (EC) specifically in current smokers.
  • Non-nicotine tobacco constituents were found to be risk factors for EC in former smokers.

Conclusions:

  • Nicotine exposure presents a dual role, increasing AD risk while offering protection against tremor and EC.
  • Non-nicotine components of tobacco smoke are significant risk factors for the development of early cognitive impairment.
  • These findings highlight the distinct neurological impacts of nicotine versus other tobacco constituents, informing therapeutic strategies.