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Mojdami ZD, Barbour A, Oveisi M, Sun C, Fine N, Saha S, Marks C, Elebyary O, Watson E, Tenenbaum H, Azarpazhooh A, Glogauer M. The Effect of Intensity-Modulated Radiotherapy to the Head and Neck Region on the Oral Innate Immune Response and Oral Microbiome: A Prospective Cohort Study of Head and Neck Tumour Patients. Int J Mol Sci 2022; 23:ijms23179594. [PMID: 36076990 PMCID: PMC9456060 DOI: 10.3390/ijms23179594] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/12/2022] [Accepted: 08/19/2022] [Indexed: 12/02/2022] Open
Abstract
Neutrophils, also known as polymorphonuclear leukocytes (PMNs), form a significant component of the innate host response, and the consequence of the interaction between the oral microbiota and PMNs is a crucial determinant of oral health status. The impact of radiation therapy (RT) for head and neck tumour (HNT) treatment on the oral innate immune system, neutrophils in particular, and the oral microbiome has not been thoroughly investigated. Therefore, the objective of this study was to characterize RT-mediated changes in oral neutrophils (oPMNs) and the oral microbiome in patients undergoing RT to treat HNTs. Oral rinse samples were collected prior to, during and post-RT from HNT patients receiving RT at Dental Oncology at Princess Margaret Cancer Centre. The oPMNs counts and activation states were analysed using flow cytometry, and the oral microbiome was analysed using 16S rRNA gene sequencing. Statistically significant (p < 0.05) drops in oPMN counts and the activation states of the CD11b, CD16, CD18, CD64 and H3Cit markers from pre-RT to post-RT were observed. Moreover, exposure to RT caused a significant reduction in the relative abundance of commensal Gram-negative bacteria and increased the commensal Gram-positive microbes. Ionizing radiation for the treatment of HNTs simultaneously decreased the recruitment of oPMNs into the oral cavity and suppressed their activation state. The oral microbiome composition post-RT was altered significantly due to RT which may favour the colonization of specific microbial communities unfavourable for the long-term development of a balanced oral microbiome.
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Affiliation(s)
- Zahra Dorna Mojdami
- Dental Oncology and Maxillofacial Prosthetics Clinic, Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Abdelahhad Barbour
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
- Correspondence: (A.B.); (M.G.)
| | - Morvarid Oveisi
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Chunxiang Sun
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Noah Fine
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Sourav Saha
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Cara Marks
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Omnia Elebyary
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Erin Watson
- Dental Oncology and Maxillofacial Prosthetics Clinic, Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
| | - Howard Tenenbaum
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
- Centre for Advanced Dental Research and Care, Department of Dentistry, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada
| | - Amir Azarpazhooh
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
- Centre for Advanced Dental Research and Care, Department of Dentistry, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada
| | - Michael Glogauer
- Dental Oncology and Maxillofacial Prosthetics Clinic, Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
- Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1X3, Canada
- Centre for Advanced Dental Research and Care, Department of Dentistry, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada
- Correspondence: (A.B.); (M.G.)
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