International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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Oral symptom manifestations in patients with COVID-19: gustatory and saliva secretion dysfunctions and pathogenetic hypotheses

  • Joungmok Kim (Department of Oral Biochemistry and Molecular Biology, College of Dentistry, Kyung Hee University) ;
  • Jeong Hee Kim (Department of Oral Biochemistry and Molecular Biology, College of Dentistry, Kyung Hee University)
  • Received : 2024.08.29
  • Accepted : 2024.09.10
  • Published : 2024.09.30
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Abstract

Coronavirus disease 2019 (COVID-19) is a highly contagious illness caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This disease is characterized by a wide spectrum of symptoms, ranging from mild to severe, including fatal outcomes. This study aims to review gustatory and salivary secretion dysfunctions and determine their potential pathogenic mechanisms. Gustatory impairment and salivary dysfunction are prevalent among patients with acute COVID-19 and those recovering from the disease. The mouth serves as a critical entry route for SARS-CoV-2. The cells within the oral epithelium, taste buds, and minor and major salivary glands express key entry factors for SARS-CoV-2, including angiotensin-converting enzyme 2, transmembrane serine protease 2, and furin. The co-occurrence of gustatory and salivary secretion dysfunctions possibly has pathogenetic association with the following factors: the expression of SARS-CoV-2 cellular entry receptors in the taste buds and salivary glands and SARS-CoV-2-induced zinc deficiency, which is crucial for normal taste perception and saliva secretion. Furthermore, the cytokine storm triggered by COVID-19 contributes to secondary damage affecting gustatory and salivary functions.

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References

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