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T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
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Spinal Nerves: Plexus II01:21

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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
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Nerve Supply of the GI Tract01:27

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The neuronal supply to the gastrointestinal (GI) tract is essential for regulating various functions, including digestion, absorption, and movement of food. This intricate network of nerves is known as the enteric nervous system (ENS), often referred to as the "second brain" of the body.
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Peripheral Nervous System: Ganglia and Nerves01:24

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The Peripheral Nervous System (PNS) is a crucial component of the body's neural network, extending beyond the central nervous system (CNS) to bridge the gap between the CNS and the external environment. It encompasses nerves, ganglia, and sensory receptors.
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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
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IL-17A Has Some Nerve!

James A Sanford1, Richard L Gallo1

  • 1Department of Dermatology, University of California San Diego, La Jolla, CA 92093, USA.

Immunity
|September 18, 2015
PubMed
Summary

Sensory neurons, specifically nociceptive fibers, are crucial for antifungal defense. These neurons influence skin immune cells and promote the production of IL-17A, enhancing the body's ability to fight fungal infections.

Area of Science:

  • Immunology
  • Neuroscience
  • Dermatology

Background:

  • Sensory neurons modulate skin inflammation.
  • The role of neurons in host antimicrobial defense remains largely unexplored.

Purpose of the Study:

  • To investigate the role of nociceptive sensory neurons in host antifungal defense.
  • To elucidate the mechanisms by which these neurons contribute to immune responses in the skin.

Main Methods:

  • Utilized mouse models to study sensory neuron function in the context of fungal skin infections.
  • Investigated the interaction between nociceptive fibers and dermal dendritic cells.
  • Assessed the induction of Interleukin-17A (IL-17A) in response to fungal stimuli.

Main Results:

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  • Demonstrated that nociceptive fibers in the dermis are critical for effective antifungal immunity.
  • Showed that these neurons influence the function of dermal dendritic cells.
  • Confirmed that nociceptive fibers induce the production of IL-17A, a key cytokine in antifungal defense.

Conclusions:

  • Nociceptive sensory neurons play a significant role in the skin's defense against fungal pathogens.
  • Targeting sensory neuron pathways could offer novel therapeutic strategies for fungal infections.