Volume 13, Issue 10 pp. 1926-1936
ORIGINAL ARTICLE

Calprotectin in chronic rhinosinusitis eosinophil extracellular traps

Sang Hyeon Ahn MD, PhD

Sang Hyeon Ahn MD, PhD

Department of Otorhinolaryngology, Bundang Jesaeng General Hospital, Daejin Medical Center, Seongnam, South Korea

Department of Medicine, The Graduate School of Yonsei University, Seoul, South Korea

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Kyu Ha Shin MD

Kyu Ha Shin MD

Department of Otorhinolaryngology, Bundang Jesaeng General Hospital, Daejin Medical Center, Seongnam, South Korea

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Jun Taek Oh MD

Jun Taek Oh MD

Department of Otorhinolaryngology, Bundang Jesaeng General Hospital, Daejin Medical Center, Seongnam, South Korea

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Sang Chul Park MD, PhD

Sang Chul Park MD, PhD

Department of otorhinolaryngology, Hallym University Kangnam Sacred Heart Hospital, Seoul, South Korea

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Min-Seok Rha MD, PhD

Min-Seok Rha MD, PhD

Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea

Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea

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Soo In Kim BS

Soo In Kim BS

Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea

Korea Mouse Sensory Phenotyping Center, Seoul, South Korea

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Hyung-Ju Cho MD, PhD

Hyung-Ju Cho MD, PhD

Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea

Korea Mouse Sensory Phenotyping Center, Seoul, South Korea

The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, South Korea

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Joo-Heon Yoon MD, PhD

Joo-Heon Yoon MD, PhD

Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea

Korea Mouse Sensory Phenotyping Center, Seoul, South Korea

The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, South Korea

Global Research Laboratory for Allergic Airway Disease, Yonsei University College of Medicine, Seoul, South Korea

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Chang-Hoon Kim MD, PhD

Corresponding Author

Chang-Hoon Kim MD, PhD

Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea

Korea Mouse Sensory Phenotyping Center, Seoul, South Korea

The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, South Korea

Medical Research Center, Yonsei University College of Medicine, Seoul, South Korea

Correspondence

Chang-Hoon Kim, MD, PhD, Department of Otorhinolaryngology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemoon-gu, 03722 Seoul, South Korea.

Email: [email protected]

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First published: 17 March 2023
Citations: 1

Abstract

Background

Calprotectin is an antimicrobial peptide primarily secreted by neutrophils. Furthermore, calprotectin secretion increases in patients with chronic rhinosinusitis (CRS) with polyps (CRSwNP) and positively correlates with neutrophil markers. However, CRSwNP is known to be associated with type 2 inflammation related to tissue eosinophilia. Therefore, the authors investigated calprotectin expression in eosinophils and eosinophil extracellular traps (EETs) and explored the associations between tissue calprotectin and the clinical findings of patients with CRS.

Methods

A total of 63 patients participated, and patients diagnosed with CRS were classified based on the Japanese Epidemiological Survey of Refractory Eosinophilic Chronic Rhinosinusitis (JESREC) score. The authors performed hematoxylin and eosin staining, immunohistochemistry, immunofluorescence with calprotectin, myeloperoxidase (MPO), major basic protein (MBP), and citrullinated histone H3 with the participant's tissues. Finally, correlations between calprotectin and the clinical data were examined.

Results

Calprotectin-positive cells are co-localized not only in MPO-positive cells but also in MBP-positive cells in human tissues. Calprotectin was also involved in EETs and neutrophil extracellular traps. The number of calprotectin-positive cells in the tissue was positively correlated with the number of tissue and blood eosinophils. In addition, calprotectin in the tissue is associated with the olfactory function, Lund–Mackay computed tomography score, and JESREC score.

Conclusions

Calprotectin, known to be secreted by neutrophils, in CRS was also expressed in eosinophils. In addition, calprotectin, which functions as an antimicrobial peptide, may play an important role in the innate immune response based on its EET involvement. Therefore, calprotectin expression could reflect as a disease severity biomarker for CRS.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

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