Hyperglycemia and the novel Covid-19 infection: Possible pathophysiologic mechanisms.

Acutely ill patients present often with hyperglycemia (caused among other factors by endogenous stress-induced glucocorticoid hypersecretion) [1]. In preliminary reports, presenting clinical characteristics of patients with the novel Covid-19 infection, hyperglycemia was noted in 51% of cases [2]. Interestingly, transient hyperglycemia was also noted in patients with SARS (Severe Acute Respiratory Syndrome in 2003, caused by another coronavirus, closely related to Covid-19, SARS-CoV) [3]; the virus leads to transient impairment of pancreatic islet cell function [3]. Additionally, the also closely related, Middle Eastern Respiratory Syndrome (MERS in 2013) coronavirus (MERS-CoV) as well as human coronavirus-EMC are anchored to host cells via dipeptidyl peptidase 4 (DPP-4, which physiologically is implicated in the modulation of insulin action and as an enzyme plays a major role in glucose metabolism and is responsible for the degradation of incretins such as glucagon like peptide −1, GLP-1) [4], [5]. Thus, we believe that the hyperglycemia noted in patients with Covid-19 may be caused via such (or analogous) mechanisms; this remains to be assessed by ulterior studies. Nevertheless, the issue of hyperglycemia should not be overlooked, since it may lead to additional immune suppression and further complications [6].

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.