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Related Concept Videos

Neural Control of Respiration01:18

Neural Control of Respiration

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
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Depressants01:28

Depressants

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Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
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Physiology of Respiration II: Neurogenic Control of Respiration01:22

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The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
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Other Factors Affecting Respiration Centers01:17

Other Factors Affecting Respiration Centers

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Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
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Opioids depress breathing through two small brainstem sites.

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Opioid overdose deaths are rising, prompting research into opioid-induced respiratory depression. Scientists identified specific brainstem neurons in the preBötzinger Complex responsible for this dangerous side effect.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Pharmacology

Background:

  • Opioid overdose deaths have quadrupled in the US since 1999, with 130 daily fatalities.
  • Opioid-induced respiratory depression is a major cause of overdose fatalities.
  • Innovative solutions require identifying the neural circuits underlying respiratory depression.

Purpose of the Study:

  • To pinpoint the brain areas and cell types responsible for opioid-induced respiratory depression.
  • To understand the mechanisms by which opioids affect breathing control.
  • To identify potential targets for novel therapeutic interventions.

Main Methods:

  • Administered opioids to murine models to observe changes in breathing.
  • Locally eliminated the µ-Opioid receptor in the brainstem.
  • Utilized genetic tools to identify specific neurons in the preBötzinger Complex.

Main Results:

  • Identified two primary changes in murine breathing patterns after opioid administration.
  • Confirmed the involvement of the brainstem's respiratory circuitry.
  • Localized the critical brain site to the preBötzinger Complex.
  • Revealed that 70-140 neurons in the preBötzinger Complex mediate opioid sensitivity.

Conclusions:

  • The preBötzinger Complex is a critical site for opioid-induced respiratory depression.
  • A small population of neurons within this complex is responsible for opioid sensitivity.
  • Further characterization of these neurons could lead to therapies preventing respiratory depression while preserving pain relief.