Circadian dependence of the acute immune response to myocardial infarction. (14th October 2021)

• Record Type: Journal Article
• Authors: Kilgallen, A B; Crnko, S; Feyen, D A M; Van Der Akker, F; Gremmels, H; Du Pre, B C; Sampiao Pinto, V M; Reijers, R; Doevendans, P A; De Jager, S C A; Sluijter, J P G; Van Laake, L W
• Is Part Of: European heart journal. Volume 42(2021)Supplement 1
• Publication Date: 2021-10-14
• Subjects: Leukocytes, Inflammation, Immunity; Cardiology -- Periodicals; Heart -- Diseases -- Periodicals; 616.12005
• DOI: 10.1093/eurheartj/ehab724.3232
• Languages: English
• ISSNs: 0195-668X

Abstract

Abstract: Aim: Circadian rhythms control many physiological processes, including numerous aspects of the immune system. Whether these immunological oscillations play a role in the pathophysiology after ischemic injury, such as myocardial infarction (MI), remains unclear. In this study, we aimed to characterize circadian rhythms during the acute inflammatory responses after MI. Methods and results: Balb/c mice were operated at Zeitgeber Time (ZT) 2, 8, 14 and 20. Three hours after MI, animals were terminated and blood and hearts were collected to assess immunological status and damage. We observed diurnal fluctuation in leukocyte numbers in the blood, peaking during the rest-phase (ZT2 and 8) of the circadian cycle. Interestingly, the homing and infiltration of neutrophils to the injured myocardium was more pronounced during the active-phase of the mice (ZT14 and 20), at which time higher levels of Troponin-T were measured in the serum. Higher neutrophil extravasation during the active phase (especially the sleep-to-wake transition, ZT14) was also correlated to greater chemokine release in the blood and adhesion molecule expression in the heart. Conclusion: The occurrence of a myocardial infarction during the early-morning hours leads to greater myocardial damage in patients. In the present study, we showed that the neutrophil response in the first hours after MI is stronger during the sleep-to-wake transition, thereby potentially playing a role in the worse clinical outcome observed during this time period. FUNDunding Acknowledgement: Type of funding sources: Public grant(s) – EU funding. Main funding source(s): This research received funding from the EU's H2020 research and innovation programme under Marie S. Curie cofund RESCUE grant agreement No 801540.