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World J Clin Cases. Aug 26, 2021; 9(24): 6969-6978
Published online Aug 26, 2021. doi: 10.12998/wjcc.v9.i24.6969
Multiple immune function impairments in diabetic patients and their effects on COVID-19
Zhong-Hua Lu, Wei-Li Yu, Yun Sun
Zhong-Hua Lu, Wei-Li Yu, Yun Sun, Department of Critical Care Medicine, The Second Affiliated Hospital, Anhui Medical University, Hefei 230601, Anhui Province, China
Author contributions: Lu ZH and Sun Y participated in the conception and drafted the manuscript; Yu WL helped draft the manuscript; all authors read and approved the final manuscript.
Supported by Doctoral Research Fund Project of the Second Affiliated Hospital of Anhui Medical University, No. 2018BSJJ005; and Clinical Medicine Discipline Construction Project of Anhui Medical University, No. 2021 Lcxk026.
Conflict-of-interest statement: The authors declare that they have no competing interests to disclose.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Yun Sun, MD, Associate Professor, Chief Doctor, Teacher, Department of Critical Care Medicine, The Second Affiliated Hospital, Anhui Medical University, No. 678 Furong Road, Hefei 230601, Anhui Province, China. sunyun15@163.com
Received: January 28, 2021
Peer-review started: January 28, 2021
First decision: February 25, 2021
Revised: March 18, 2021
Accepted: July 5, 2021
Article in press: July 5, 2021
Published online: August 26, 2021
Abstract

Coronavirus disease 2019 (COVID-19), which is caused by severe acute respiratory syndrome coronavirus 2, poses a significant threat to public health worldwide, and diabetes is considered a risk factor for the rapid progression and poor prognosis of COVID-19. Limited immune function is a clinical feature of COVID-19 patients, and diabetes patients have defects in innate and adaptive immune functions, which may be an important reason for the rapid progression and poor prognosis of COVID-19 in patients with diabetes. We review the possible multiple effects of immune impairment in diabetic patients on the immune responses to COVID-19 to provide guidance for the diagnosis and treatment of diabetic patients with COVID-19.

Keywords: COVID-19, Diabetes, Immune function, SARS-CoV-2

Core Tip: Diabetes is an important predictor of coronavirus disease 2019 (COVID-19) morbidity and mortality. The immune response impairment presented by diabetes mellitus (DM) may be among the underlying mechanisms of the association between diabetes and COVID-19. DM patients with uncontrolled hyperglycemia are more prone to develop severe COVID-19 due to T cell dysfunction. Therefore, DM is often associated with impaired innate and adaptive immune function, thus greatly increasing the risk of severe acute respiratory syndrome coronavirus 2 infection in DM patients.