Abstract
The human chemokine stromal cell-derived factor-1 (SDF-1) or CXCL12 is involved in several homeostatic processes and pathologies through interaction with its cognate G protein-coupled receptor CXCR4. Recent research has shown that CXCL12 is present in the lungs and circulation of patients with coronavirus disease 2019 (COVID-19). However, the question whether the detected CXCL12 is bioactive was not addressed. Indeed, the activity of CXCL12 is regulated by NH2- and COOH-terminal post-translational proteolysis, which significantly impairs its biological activity. The aim of the present study was to characterize proteolytic processing of CXCL12 in broncho-alveolar lavage (BAL) fluid and blood plasma samples from critically ill COVID-19 patients. Therefore, we optimized immunosorbent tandem mass spectrometry proteoform analysis (ISTAMPA) for detection of CXCL12 proteoforms. In patient samples, this approach uncovered that CXCL12 is rapidly processed by site-specific NH2- and COOH-terminal proteolysis and ultimately degraded. This proteolytic inactivation occurred more rapidly in COVID-19 plasma than in COVID-19 BAL fluids, whereas BAL fluid samples from stable lung transplantation patients and the non-affected lung of lung cancer patients (control groups) hardly induced any processing of CXCL12. In COVID-19 BAL fluids with high proteolytic activity, processing occurred exclusively NH2-terminally and was predominantly mediated by neutrophil elastase. In low proteolytic activity BAL fluid and plasma samples, NH2- and COOH-terminal proteolysis by CD26 and carboxypeptidases were observed. Finally, protease inhibitors already approved for clinical use such as sitagliptin and sivelestat prevented CXCL12 processing and may therefore be of pharmacological interest to prolong CXCL12 half-life and biological activity in vivo.
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This work was supported by research grants from Katholieke Universiteit Leuven (KU Leuven; C1 grant C16/17/010) and Fonds Wetenschappelijk Onderzoek-Vlaanderen (FWO-Vlaanderen; grant G0F8822N). This work was also supported by a KU Leuven (CONTAGIOUS) and a University Hospitals Leuven (UZ Leuven; KOOR project) internal grant. SC received a PhD fellowship from FWO-Vlaanderen (grant number 11A4220N). ACDC is supported by a Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) PhD fellowship. REM is a Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Research Fellow and supported by a FWO-Vlaanderen FAPESP bilateral agreement research grant (2021/05519-0).
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SC, FB, MG, and PP designed the experiments. SC, FB, NP, MM, ACDC, and EM performed the experiments and analyzed the data. JK, CA, CJ, PVM, EW, PM, GH, BV, RV, and JW were involved in collection of patient samples and clinical data analysis. REM provided resources. SC and FB visualized the data. JW, MG, and PP supervised this study. SC and FB wrote the original draft of this manuscript. All the authors reviewed, edited, and approved the final version of the manuscript.
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Cambier, S., Beretta, F., Pörtner, N. et al. Proteolytic inactivation of CXCL12 in the lungs and circulation of COVID-19 patients. Cell. Mol. Life Sci. 80, 234 (2023). https://doi.org/10.1007/s00018-023-04870-0
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DOI: https://doi.org/10.1007/s00018-023-04870-0