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Pain01:20

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Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Analgesia and Pain Management01:25

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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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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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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Protease-activated receptor 2 signalling pathways: a role in pain processing.

Yanju Bao1, Wei Hou, Baojin Hua

  • 1Guang'anmen Hospital, China Academy of Chinese Medical Science, Department of Oncology , Beixiange 5, Xicheng District, Beijing 100053 , China +86 10 88001221 ; +86 10 88001430 ; baoyanju@126.com ; houwei1964@sohu.com ; huabaojin@sohu.com.

Expert Opinion on Therapeutic Targets
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Protease-activated receptor 2 (PAR2) plays a key role in pain, including chronic, neuropathic, and cancer pain. Understanding PAR2 signaling pathways may reveal new therapeutic targets for pain management.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • Pain is a complex condition with neurophysiological, behavioral, and psychosocial aspects.
  • Chronic pain often resists current treatments, highlighting the need for novel therapeutic targets.
  • Protease-activated receptor 2 (PAR2) is increasingly implicated in the pathogenesis of various pain types.

Purpose of the Study:

  • To review the role of the PAR2 signaling pathway in pain.
  • To describe the basic mechanisms of PAR2 activation and expression in the nervous system.
  • To outline the intracellular signaling pathways activated by PAR2.

Main Methods:

  • Literature review of studies on PAR2 and pain.
  • Analysis of PAR2 expression and activation mechanisms.
  • Description of intracellular signaling cascades downstream of PAR2.

Main Results:

  • PAR2 activation is observed in several pain disease models.
  • PAR2 is activated by nerve injury and serine proteases.
  • PAR2 signaling is crucial for pain development and maintenance.

Conclusions:

  • The role of PAR2 in pain processing is increasingly evident.
  • PAR2 activation is linked to pain development and maintenance, suggesting its potential as a therapeutic target.
  • Further research is needed to clarify PAR2's causal role and optimize potential PAR2-directed therapies.