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Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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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. 
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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
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Methamphetamine inhibits antigen processing, presentation, and phagocytosis.

Zsolt Tallóczy1, Jose Martinez, Danielle Joset

  • 1Department of Neurology, Columbia University, New York, New York, United States of America.

Plos Pathogens
|February 20, 2008
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Summary

Chronic methamphetamine (Meth) abuse directly suppresses immune cells like dendritic cells and macrophages. This impairs the body's ability to fight infections, increasing HIV and AIDS-related pathogen risks.

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Area of Science:

  • Immunology
  • Cell Biology
  • Infectious Diseases

Background:

  • Methamphetamine (Meth) abuse affects over 35 million people globally.
  • Chronic Meth use is linked to a twofold higher risk of HIV acquisition and secondary infections, particularly in those with multiple sexual partners.

Purpose of the Study:

  • To investigate the direct impact of Methamphetamine on immune cells.
  • To elucidate the cellular mechanisms underlying Methamphetamine's immunosuppressive effects.

Main Methods:

  • Assessing Methamphetamine's effects on dendritic cells and macrophages at pharmacological concentrations.
  • Investigating Methamphetamine's influence on organelle pH gradients and related cellular processes.
  • Evaluating Methamphetamine's impact on the phagocytosis and antigen presentation capabilities of immune cells.
  • Examining Methamphetamine's effects on the intracellular replication and killing of AIDS-related pathogens like Candida albicans and Cryptococcus neoformans.

Main Results:

  • Methamphetamine directly suppresses dendritic cells and macrophages.
  • Methamphetamine disrupts the pH gradient in acidic organelles, inhibiting phagocytosis and antigen presentation.
  • Methamphetamine facilitates the replication and impairs the killing of major AIDS-related pathogens.

Conclusions:

  • Methamphetamine exerts previously unreported direct immunosuppressive effects on key immune cells.
  • These effects contribute to an increased susceptibility to infections and exacerbate Acquired Immunodeficiency Syndrome (AIDS) pathology.
  • Understanding these mechanisms is crucial for addressing the health consequences of Methamphetamine abuse in vulnerable populations.