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Decreased circulating dipeptidyl peptidase-4 enzyme activity is prognostic for severe outcomes in COVID-19 inpatients

TLDR
Investigation of serum circulating DPP4 activity in patients with COVID-19 disease found a significant decrease was found in study groups of higher disease severity and is a strong prognostic biomarker of mortality.
Abstract
Aim: To investigate the serum circulating DPP4 activity in patients with COVID-19 disease. Materials & methods: Serum samples from 102 hospitalized COVID-19 patients and 43 post-COVID-19 plasma donors and 39 SARS-CoV-2 naive controls and their medical data were used. Circulating DPP4 activities according to different COVID-19 disease peak severity (WHO) groups at sampling and at peak were assessed. Results: A significant decrease (p < 0.0001) in serum DPP4 activity was found in study groups of higher disease severity. When the circulating DPP4 activity was assessed as a prognostic marker, the logistic regression (p = 0.0023) indicated that the enzyme activity is a predictor of mortality (median 9.5 days before death) with receiver operating characteristic area under the curves of 73.33% (p[area = 0.5] < 0.0001) as single predictor and 83.45% (p[area = 0.5] < 0.0001) in combination with age among hospitalized patients with COVID-19. Conclusion: Decreased circulating DPP4 activity is associated with severe COVID-19 disease and is a strong prognostic biomarker of mortality.

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Role of Dipeptidyl Peptidase-4 (DPP4) on COVID-19 Physiopathology

TL;DR: It is shown that the broad spectrum of functions regulated by DPP4 is performed both as a protease enzyme, as well as an interacting partner of other molecules on the cell surface, which indicates that the pathogenetic links between COVID-19 and diabetes mellitus and the hyperinflammatory response are severe.
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The many facets of CD26/dipeptidyl peptidase 4 and its inhibitors in disorders of the CNS – a critical overview

TL;DR: For a number of diseases, use of DPP4 inhibitors has been shown to have a disease-mitigating effect, however, these beneficial effects should mostly be attributed to the depression of “peripheral” DPP 4, since currently used DPP3 inhibitors are not able to pass through the intact blood–brain barrier.
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Saxagliptin Cardiotoxicity in Chronic Heart Failure: The Role of DPP4 in the Regulation of Neuropeptide Tone

TL;DR: In this article , the authors established a cellular platform to investigate DPP4 inhibition and the role of its neuropeptide substrates substance P (SP) and NPY (NPY).
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Effect of DPP4/CD26 expression on SARS-CoV-2 susceptibility, immune response, adenosine (derivatives m62A and CD) regulations on patients with cancer and healthy individuals

TL;DR: In this paper , the authors used the Human Protein Atlas, Monaco, and Schmiedel databases to analyze the expression of DPP4 in human tissues and immune cells, and the association between DPP 4 expression and survival in various tumor tissues was compared using GEPIA 2.
References
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Journal ArticleDOI

Clinical course and risk factors for mortality of adult inpatients with COVID-19 in Wuhan, China: a retrospective cohort study.

TL;DR: Wang et al. as discussed by the authors used univariable and multivariable logistic regression methods to explore the risk factors associated with in-hospital death, including older age, high SOFA score and d-dimer greater than 1 μg/mL.
Journal ArticleDOI

SARS and MERS: recent insights into emerging coronaviruses

TL;DR: The emergence of Middle East respiratory syndrome coronavirus (MERS-CoV) in 2012 marked the second introduction of a highly pathogenic coronav virus into the human population in the twenty-first century, and the current state of development of measures to combat emerging coronaviruses is discussed.
Journal ArticleDOI

Dipeptidyl peptidase 4 is a functional receptor for the emerging human coronavirus-EMC

TL;DR: Dipeptidyl peptidase 4 (DPP4; also known as CD26) is identified as a functional receptor for hCoV-EMC and will contribute critically to the understanding of the pathogenesis and epidemiology of this emerging human coronavirus, and may facilitate the development of intervention strategies.
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