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. 2024 Nov 8;135(11):1116-1118.
doi: 10.1161/CIRCRESAHA.124.324938. Epub 2024 Oct 1.

Pneumonia Induced Rise in Glucagon Promotes Endothelial Damage and Thrombogenicity

Affiliations

Pneumonia Induced Rise in Glucagon Promotes Endothelial Damage and Thrombogenicity

Pegah Ramezani Rad et al. Circ Res. .
No abstract available

Keywords: glucagon; injuries; pneumonia; thrombosis; vascular.

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Conflict of interest statement

None.

Figures

Figure.
Figure.
Glucagon increase caused by pneumococcal pneumonia promotes endothelial damage and thrombogenicity. Ai, C57BL/6J mice were randomly assigned to control or pneumonia groups and subjected to carotid injury (CI). Aii, Hematoxylin and eosin-stained lung images. Aiii, Lung injury scores per time point (n=6(t1)). Aiiii, Evans blue-stained injured carotid arteries 3 days post-CI. Bi, Plasma proteomics analyzed using RStudio (n=5(t1)). Bii, ELISA-measured glucagon levels in mice 48 hours and 10 days postinfection (p.i.; n=6, Control+CI n=8(t1)). Ci, Real-time oxygen consumption rate (OCR) in human aortic endothelial cells (HAECs) stimulated with glucagon for 6 hours. Ciii, ROS production after glucagon stimulation for 3 hours (n=6(ANOVA2)). Ciii, Scratch-wound healing assay with representative HAEC migration images. Di and Dii, ICAM-1 (intercellular adhesion molecule-1; n=6(ANOVA2)) and E-selectin (n=6(KW4)) expression in HAECs measured by flow cytometry as percentage of CD54+ or CD62E+ singlets. Diii, Quantification of THP-1 cell adhesion to HAECs under flow (n=8(ANOVA2)). Diiii, Quantification of CD42b+ coverage on HAEC monolayer (n=6, 100 nM glucagon, n=5(KW4)). Ei, Blood glucagon concentration measured by ELISA 48 hours p.i. in mice treated with liraglutide (n=6(t1)). Eii, Evans blue-stained injured carotid arteries 3 days post-CI (pneumonia group results are the same as in Aiiii). Fi, Thrombus formation in carotid arteries of control (n=6), pneumonia (n=6), and liraglutide (n=4(KW4)) groups at 3 time points. Fii, Time-course of thrombus area. Data were analyzed with GraphPad Prism 9 (mean±SEM). Normality was checked via the Shapiro-Wilk test. Normally distributed data were analyzed with unpaired 2-tailed Student t tests(t1) or 1-way ANOVA(ANOVA2) with Bonferroni post hoc tests. Nonparametric data were analyzed with Mann-Whitney U test U(MW3) or Kruskal-Wallis test(KW4) with Dunn post hoc tests. FCCP indicates carbonyl cyanide-p-trifluoromethoxyphenylhydrazone; ROS, reactive oxygen species; and THP-1, Tohoku Hospital Pediatrics-1, a human leukemia monocytic cell line.

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References

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