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. 2022 Mar;6(3):e2100752.
doi: 10.1002/smtd.202100752. Epub 2022 Jan 13.

Single-Cell RNA Sequencing Reveals the Temporal Diversity and Dynamics of Cardiac Immunity after Myocardial Infarction

Kaiyu Jin  1 , Shan Gao  2   3 , Penghui Yang  1 , Rongfang Guo  1 , Dan Li  2   3 , Yunsha Zhang  4 , Xiaoyan Lu  1 , Guanwei Fan  2   3   5 , Xiaohui Fan  1   5   6
Affiliations

Single-Cell RNA Sequencing Reveals the Temporal Diversity and Dynamics of Cardiac Immunity after Myocardial Infarction

Kaiyu Jin et al. Small Methods. 2022 Mar.

Abstract

Myocardial infarction (MI) is strongly associated with the temporal regulation of cardiac immunity. However, a variety of current clinical trials have failed because of the lack of post-MI immunomodulating/anti-inflammatory targets. Single-cell RNA sequencing analysis of the cardiac Cd45+ immune cell at 0, 3, 7, and 14 d after injury in a mouse left anterior descending coronary artery ligation model is performed. Major immune cell populations, distinct subsets, and dynamic changes are identified. Macrophages (Mø) are most abundant, peaking at 3 d after infarction. Mø-5 and Mø-6 are the predominant infiltrated subsets at this time point, with strong expression of inflammatory factors. Further analysis demonstrates that suppressing these sets attenuated pathological MI progression by preventing subsequent leukocyte extravasation and adverse remodeling. Abundant apoptotic neutrophils and a profibrotic macrophage subset on days 7 and 14, respectively, are also detected. These results provide a basis for developing cell type- and time-specific interventions in MI.

Keywords: cardiac immune populations; macrophages; myocardial infarction; single-cell RNA sequencing; temporal dynamics.

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