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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...
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Apoptosis01:30

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
Normal cells contain receptors that prevent them from being recognized by phagocytes.

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Updated: Jul 11, 2026

Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations
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Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations

Published on: January 10, 2015

Nicotine and apoptosis.

Reinhard Zeidler1, Kaj Albermann, Stephan Lang

  • 1ENT-Department, University of Munich, c/o GSF-Forschungszentrum, Marchioninistr. 25, 81377 Munich, Germany. zeidler@gsf.de

Apoptosis : an International Journal on Programmed Cell Death
|September 12, 2007
PubMed
Summary

Nicotine, found in cigarettes, influences apoptosis, a key cell process. This review explores how nicotine impacts apoptosis, potentially contributing to cancer and obstructive diseases.

Area of Science:

  • Cell Biology
  • Oncology
  • Immunology

Background:

  • Cigarette smoking is linked to numerous diseases.
  • Nicotine, the addictive component, affects non-neuronal cells, including immune cells.
  • Nicotine's role as a 'tumor enhancer' is debated, despite not being a carcinogen itself.

Purpose of the Study:

  • To review how nicotine influences apoptotic processes.
  • To examine nicotine's direct involvement in the etiology of cancer and obstructive diseases.

Main Methods:

  • Literature review of studies on nicotine and apoptosis.
  • Analysis of nicotine's interaction with nicotinic acetylcholine receptors.
  • Examination of nicotine's effects on biological processes like angiogenesis and immunity.

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High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)
11:38

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

Published on: May 10, 2016

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Methods to Evaluate Cytotoxicity and Immunosuppression of Combustible Tobacco Product Preparations
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Using Nicotine in a Silica-Exposed Mouse Model to Promote Lung Epithelial-Mesenchymal Transition
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Using Nicotine in a Silica-Exposed Mouse Model to Promote Lung Epithelial-Mesenchymal Transition

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High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)
11:38

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

Published on: May 10, 2016

Main Results:

  • Nicotine binds to nicotinic acetylcholine receptors.
  • Nicotine disrupts critical biological processes including apoptosis, angiogenesis, and cell-mediated immunity.
  • Nicotine's influence on apoptosis is implicated in pathological conditions.

Conclusions:

  • Nicotine directly impacts apoptotic processes.
  • Nicotine's role in deregulating apoptosis contributes to the development of diseases like cancer and obstructive conditions.
  • Further research is needed to fully elucidate nicotine's mechanisms in disease etiology.