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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Olfactory dysfunction and autoimmunity: pathogenesis and new insights.

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Smell impairment is linked to autoimmune diseases due to system similarities. This review explores olfactory dysfunction, clinical aspects, and potential mechanisms in these conditions.

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Area of Science:

  • Neuroscience
  • Immunology
  • Otorhinolaryngology

Background:

  • Olfaction is crucial for environmental perception.
  • Smell impairment is increasingly recognized as a symptom of autoimmune diseases.
  • Shared biological pathways between olfactory and immune systems support this link.

Purpose of the Study:

  • To review current literature on olfactory dysfunction in autoimmune diseases.
  • To discuss the clinical manifestations of smell impairment in these conditions.
  • To offer insights into the pathogenesis and underlying mechanisms.

Main Methods:

  • Comprehensive literature search of human studies and animal models.
  • Analysis of existing research on olfactory system and immune system interactions.
  • Synthesis of findings related to autoimmune disease and smell dysfunction.

Main Results:

  • Evidence suggests a significant association between autoimmune diseases and olfactory dysfunction.
  • Clinical presentations vary, but smell impairment is a notable manifestation.
  • Pathogenic mechanisms likely involve complex interactions between immune responses and olfactory pathways.

Conclusions:

  • Olfactory dysfunction is a relevant clinical feature in autoimmune diseases.
  • Further research into pathogenesis can reveal therapeutic targets.
  • Understanding these connections can improve patient diagnosis and management.