Name: preparation of a non-cardiomyocyte cell suspension for single-cell rna sequencing from a post-myocardial infarction adult mouse heart
Uploaded: 2023-02-03T12:40:00
Description: Watch this Scientific Journal Video about Preparation of a Non-Cardiomyocyte Cell Suspension for Single-Cell RNA Sequencing from a Post-Myocardial Infarction Adult Mouse Heart at JoVE.com

This work was supported by the Natural Science Funds of Zhejiang Province (LQ22H020010).

All the experiments were conducted in accordance with the guidelines for the care and use of laboratory animals at Zhejiang University and were approved by the Animal Advisory Committee at Zhejiang University.
1. Left anterior descending coronary artery ligation (LAD ligation) surgery
NOTE: Eight week old male C57BL/6J mice were used as models. The hearts were harvested 2 weeks after MI. Left anterior descending coronary artery ligation surgery was ca...

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This article aimed to describe a protocol to isolate single non-cardiomyocytes from mouse hearts post MI. The protocol can be applied to isolate different types of cells in the post-MI microenvironment with high quality, including immune cells, endothelial cells, and fibroblasts. Three essential factors are crucial for obtaining a high-quality cell suspension for single-cell sequencing. The first one is the setting of the enzymatic digestion. It is important to control the time of digestion and the volume and concentrati...

Myocardial infarction (MI) is one of the most common cardiovascular diseases, and its mortality increasing throughout the world1. MI is caused by an insufficient blood supply to the surrounding myocardium, which can be a result of a coronary artery blockage that occurs with atherosclerotic plaque rupture. Although percutaneous coronary intervention (PCI) has reduced the mortality rates of acute MI patients, the high prevalence of heart failure post MI remains a problem2. The key pathophysiology underlying post-MI heart failure is the body&#39;s compensatory response to cardiac injuries, which involves replacing the dead cardiac muscle with non-contractile fibrotic scars. These adaptive responses significantly rely on local inflammation mediated by the interactions between multiple cell types and cardiac tissue cells, and this inflammation is now considered as a potential therapeutic target to reduce fibrotic scar formation and, thus, protect against post-MI heart failure3,4. Interestingly, the microenvironment at the infarction site experiences a time-dependent transition in the infiltrating cell types and functions at different stages of MI1,5. Many studies have shown that non-cardiomyocytes (e.g., immune cells, fibroblasts, and endothelial cells) play central roles in post-MI inflammation and tissue repair5,6. In recent years, single-cell sequencing has been widely used as a powerful tool for elucidating the involvements and functions of non-cardiomyocytes in the post-MI microenviroment7,8. This provides insights into the pathophysiology of post-MI injury and repair and the development of potential therapies against post-MI heart failure.
High-throughput RNA sequencing (RNA-Seq) is a technique used to study entire transcriptomes in great detail using next-generation sequencing (NGS)7,8,9. Recently, the development of scRNA-Seq has revolutionized the biomedical research field. Compared with conventional bulk sequencing, scRNA-Seq analyses gene expression profiles and transcriptional heterogeneity at the single-cell level7,8. This technique significantly promotes the research of the cellular pathophysiology of MI9,10 by identifying different circulating cell types in the post-MI microenvironment and uncovering the interaction between cardiomyocytes and non-cardiomyocytes. These findings further contribute to uncovering novel therapeutic targets for post-MI heart failure. In general, the scRNA-seq-based post-MI experiment includes three main sections: (1) the establishment of post-MI animal model; (2) the preparation of the cell suspension; and (3) sample sequencing and data analysis. Noticeably, preparing the cell suspension is the most critical step in the preparation of the scRNA-Seq experiment because the quality of the cell suspension determines the accuracy of the results.
This protocol is designed to extract a non-cardiomyocyte cell suspension from the post-MI cardiac tissue; significantly, the specific details for maintaining cell viability and resolution are included. Meanwhile, the equipment used in this protocol, such as surgical kits for mice, rodent ventilators, and centrifuges, can be found in most animal experiment centers and biomedical laboratories, and, thus, the experiment cost of this protocol is relatively low. Furthermore, if considering time points and sites of infarction as variables, this protocol can be applied to simulate a wide range of clinical scenarios, especially for the post-MI complications.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Acridine Orange / Propidium Iodide Stain</td>
			<td>Logos biosystems</td>
			<td>F23001</td>
			<td></td>
		</tr>
		<tr>
			<td>Automated&#160;Cell&#160;Counter</td>
			<td>Logos biosystems</td>
			<td>L20001</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine Serum Albumin</td>
			<td>Servicebio</td>
			<td>G5001</td>
			<td>Cytoprotective effect</td>
		</tr>
		<tr>
			<td>Cell Counting Slides</td>
			<td>Logos biosystems</td>
			<td>L12001</td>
			<td></td>
		</tr>
		<tr>
			<td>Collagenase Type IV</td>
			<td>Gibco</td>
			<td>17104019</td>
			<td>Digestive enzymes</td>
		</tr>
		<tr>
			<td>Dispase II</td>
			<td>Sigma</td>
			<td>D4693</td>
			<td>Digestive enzymes</td>
		</tr>
		<tr>
			<td>Dnase I</td>
			<td>Roche</td>
			<td>11284932001</td>
			<td>Prevent cell clumping</td>
		</tr>
		<tr>
			<td>Falcon&#160;40&#956;m Cell Strainer</td>
			<td>Falcon</td>
			<td>352340</td>
			<td>Remove cell clumps</td>
		</tr>
		<tr>
			<td>Falcon&#160;70&#956;m Cell Strainer</td>
			<td>Falcon</td>
			<td>352350</td>
			<td>Remove undigested tissue and clumps</td>
		</tr>
		<tr>
			<td>Flow Cell Sorter</td>
			<td>Beckman Coulter</td>
			<td>B25982</td>
			<td></td>
		</tr>
		<tr>
			<td>Iodophor</td>
			<td>OU QING SI</td>
			<td>10054963976859</td>
			<td></td>
		</tr>
		<tr>
			<td>Needle Holder</td>
			<td>FST</td>
			<td>12061-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Ophthalmic Forceps</td>
			<td>RWD</td>
			<td>F14012-10</td>
			<td></td>
		</tr>
		<tr>
			<td>Ophthalmic Scissors</td>
			<td>RWD</td>
			<td>S11036-08</td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate Buffered Saline&#160;</td>
			<td>Servicebio</td>
			<td>G4202-500ML</td>
			<td></td>
		</tr>
		<tr>
			<td>RBC Lysis Buffer</td>
			<td>Beyotime</td>
			<td>C3702-120ml</td>
			<td>Remove red blood cells</td>
		</tr>
		<tr>
			<td>Rib Retractor</td>
			<td>FST</td>
			<td>17005-04</td>
			<td></td>
		</tr>
		<tr>
			<td>Rodent Ventilator</td>
			<td>Harvard</td>
			<td>730043</td>
			<td></td>
		</tr>
		<tr>
			<td>RPMI 1640 Medium</td>
			<td>Gibco</td>
			<td>11875093</td>
			<td>Solvent&#160;solution of enzyme</td>
		</tr>
		<tr>
			<td>Sterile Scissor</td>
			<td>RWD</td>
			<td>S14014-10</td>
			<td></td>
		</tr>
	</tbody>
</table>

preparation of a non-cardiomyocyte cell suspension for single-cell rna sequencing from a post-myocardial infarction adult mouse heart

Myocardial infarction (MI) is one of the most common cardiovascular diseases, with increasing mortality worldwide. Non-cardiomyocytes account for more than half of the total cardiac cell population, and they contribute to adaptive compensations upon myocardial injury, including inflammatory responses, tissue repair, and scar formation. To study the post-MI cardiac microenvironment, single-cell RNA sequencing (scRNA-seq) is widely used to identify different cardiac cell types and intercellular communications. Among the procedures of scRNA-seq sample preparation, preparing the cell suspension is one of the most critical steps, because the cell viability can affect the quality of the scRNA-seq results. Therefore, we designed an experimental protocol for preparing a non-cardiomyocyte cell suspension from post-MI mouse hearts with an extra focus on improving the cell viability by choosing mild digestive enzymes, controlling the digestion time, and applying fluorescence-activated cell sorting (FACS). Finally, we isolated CD45+ cells from the non-cardiomyocyte cell suspension obtained through this protocol, and then we performed scRNA-seq.

A single-cell suspension with high vitality was obtained by implementing section 2 of this protocol. However, cell fragments could still be observed (Figure 1A); hence, fluorescence-activated cell sorting (FACS) was performed to further improve the quality16.After FACS, the average cell size reduces from 9.6 &#181;m to 9.1 &#181;m (Table 1), which suggests that the proportion of cell fragments can be effectively reduced in the cell suspension by FACS ...

Watch this Scientific Journal Video about Preparation of a Non-Cardiomyocyte Cell Suspension for Single-Cell RNA Sequencing from a Post-Myocardial Infarction Adult Mouse Heart at JoVE.com

Preparation of a Non-Cardiomyocyte Cell Suspension for Single-Cell RNA Sequencing from a Post-Myocardial Infarction Adult Mouse Heart

Here, we describe a protocol to isolate a sufficient amount of single non-cardiomyocytes with high viability from a post-myocardial infarction (MI) mouse heart. This can be used for subsequent single-cell sequencing, flow cytometry analysis, and primary cell culture.

Myocardial infarction (MI) is one of the most common cardiovascular diseases, with increasing mortality worldwide. Non-cardiomyocytes account for more ...

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