Angiogenesis after acute myocardial infarction: a bibliometric -based literature review

Abstract

Objective:

The prevalence of acute myocardial infarction, a severe ischemic cardiac disease, is on the rise annually. The establishment of coronary collateral circulation in the border zone of the infarct can effectively relieve myocardial ischemia and impede cell death, while angiogenesis can promote the formation of collateral circulation in the ischemic tissues. Over the past two decades, studies related to angiogenesis in acute myocardial infarction have increased rapidly. However, there is a lack of bibliometric studies in this particular field.

Methods:

For this study, we employed bibliometric analysis to outline focal points and patterns in scientific and clinical research. The collection of literature was gathered using the Web of Science Core Collection database. Bibliometric and visual analysis were conducted. Knowledge maps were generated using CiteSpace and VOSviewer software.

Results and conclusions:

With the deepening of the research, therapeutic angiogenesis will become a treatment direction for acute myocardial infarction in the future.

Introduction

Acute myocardial infarction (AMI) is a serious cardiovascular disease caused by rupture or erosion of an unstable atherosclerotic plaque, which trigger fatally thrombus obstruction of the lumen of the offender's coronary artery, ultimately leading to progressive myocardial tissue necrosis in the hypoperfused blood supply region (1). AMI remains one of the leading causes of cardiovascular death worldwide, as well as a major cause of chronic heart failure, severely affecting patients' life expectancy and long-term quality of survival (2). Currently, the application of secondary prevention agents for coronary artery disease and the rapid development of percutaneous coronary intervention (PCI) techniques have improved the survival of AMI patients and reduced the rate of recurrent MI (3). However, despite the prevalence of accessible and stringent in-time reperfusion therapy and advanced antithrombotic strategies, patients with severe left cardiac insufficiency remains intractable to be managed (4). These individuals have a very high probability of heart failure, which severely impairs the long-term prognosis (5). Therefore, additional therapeutic strategies for post-AMI are urgently needed.

In recent years, the mechanisms of angiogenesis in infarct border zone have attracted interest in the cardiovascular field. And researchers aim to explore new therapeutic directions for improving impaired cardiac function after myocardial infarction. Lumen occlusion of epicardial coronary arteries triggers irreversible damage to the coronary microcirculation, ultimately resulting in vascular disintegration within the infarct core (6). Myocardial tissue in the necrotic core undergoes necrosis due to ischemic irreversible injury. In the meantime, cardiomyocytes are lysed by proteolytic enzymes and release large amounts of cytokines to recruit neutrophils which participate in cardiac repair (7). Subsequently, sterile inflammatory response is initiated and the necrotic core is eventually replaced by granulation tissue, resulting in a collagen-rich scar formation (8). As the process of myocardial fibrosis varies between individuals, patients suffer different early deleterious changes in ventricular structure and function before scar formation (9). Notably, post-infarction angiogenesis offers novel therapeutic perspectives for saving the surviving ischaemic myocardium (10). Previous study indicated that cardiac repair after myocardial infarction includes a endothelial angiogenic response that initially begins in infarct border zone and spreads to the necrotic tissue (11). Angiogenesis is characterized by the sprouting of new vessels from the pre-existing myocardial capillary network (10). The repair of microvascular injury is largely dependent on the angiogenic rather than the arteriogenic response (12). In the initial phase, when exposed to stimulation by angiogenic signals, such as vascular growth factors, coronary endothelial cells are relaxed and detached from the vessel wall. Then, degradation of the basement membrane and extracellular matrix forms a temporary stroma (13, 14). The above process allows the endothelial cells to migrate and adhere to each other and to the extracellular matrix, a stage known as the sprouting of the endothelium. Subsequent hydrolytic remodeling of the extracellular matrix catalyzed by various enzymes ensures the stability of the pericyte-coated neovascularization and helps it to integrate into the coronary microcirculatory network (15).

Despite PCI surgery and secondary prevention medications for coronary artery disease, the patient's necrotic myocardial cells failed to regenerate. The formation of scar tissue limits the contractility of the ventricles, which may still irreversibly lead to heart failure. Therefore, salvaging the infarct border zone myocardium, which still has partial physiological function, is essential for the repair of myocardial injury. In recent years, angiogenesis in infarct border zone have attracted interest in the cardiovascular field. And researchers aim to explore new therapeutic directions for improving impaired cardiac function after myocardial infarction. However, bibliometric studies in this area are still lacking. The objective of this research was to explore hot spots, trends, and potential therapeutic directions in the field of angiogenesis after AMI over the past 20 years through bibliometric analysis. Overall, our study may help to provide novel insights for future clinical practice regarding the therapeutic application of AMI.

Methods

Search methodologies and data collection

The database selected for data retrieval was the Science Citation Index Expanded (SCI-EXPANDED) from the Web of Science Core Collection (WoSCC) (12). Data was acquired from the aforementioned database on January 2nd. In the WOS database, the following keywords and strategies are used: #1, “angiogenesis”; #2, “acute myocardial infarction”; #3, “#1” AND “#2”. Articles from 2000 to 2024 (January 2nd, 2024) were identified. English was the selected language, and the document type included both articles and reviews. SCI-EXPANDED database was used to identify articles, and the associated data was entered into Excel 2019. The qualifying papers were analyzed independently by two writers. We exported the full record of data from WoSCC, including the number of annual publications; outputs of countries/regions, journals, authors and total citations; impact factor (IF) in 2022, Journal Citation Reports (JCR) 2022 and Hirsch index (H-index). All data were downloaded in TXT format, and renamed with the “download∗.txt” convention to ensure that they were read correctly by the CiteSpace and VOSviewer software.

Bibliometric analysis

Microsoft Excel 2019, VOSviewer, and CiteSpace were utilized for bibliometric and visual analysis of the relevant documents obtained from WoSCC. The standard competition ranking method determines the order of ranking. The ranking order is determined using the standard competition ranking method. Figure 1 illustrates the utilization of VOSViewer and CiteSpace for conducting bibliometric analysis and network visualization (12). Through the examination of important scholars' published keywords and key references, we have identified and determined the current research focal points and cutting-edge areas within this particular field.

Figure 1

The retrieved data were put into the CiteSpace 6.1. R2 software to produce visualized maps to analyse the cooccurrence, clustering, and bursts. The parameters of CiteSpace were set as follows: time slicing (from 2001-01-01 to 2024-01-02), years per slice (1), links (strength = cosine; scope = withinslices); pruning (pathfinder + pruning sliced network + pruning the merged network); and the term source and node types are flexible parameters according to specific needs. All the clusters were labelled by keywords, and the loglikelihood rate (LLR) was used as the clustering algorithm. Synonyms were combined in the obtained analysis map according to the actual situation.

Visualization of bibliometric network graphs was performed using VOSviewer v1.6.10.0 (13). To conduct this research, VOSviewer was employed to analyze organizations, authors and keywords. Publication numbers are represented by the size of nodes, the strength of relationships is indicated by the thickness of lines, and the era or cluster of publications is denoted by the color of nodes. We set the counting method as full counting; other thresholds were shown in the corresponding chapter. In the clustermap, the size of node reflects the co-occurrence frequencies, and the same color represents the same cluster; furthermore, the link indicates the co-occurrence relationship, and the thickness of the link depends on a calculated strength value, which is proportional to the number of publications two researchers co-authored or the number of publications in which two keywords occur together.

CiteSpace is furnished with cluster analysis and timeline perspectives, enabling the possibility of visually assessing knowledge domains (14). Keywords can be categorized and the most relevant hotspots for studies on angiogenesis and acute myocardial infarction can be discovered using cluster analysis.

Results

Distribution of countries/regions and institutions

Figure 2A shows that the 1,310 articles were published across 265 countries/regions. Several countries/regions collaborated on certain studies, relying on the statistical analysis (Figure 2B). According to the data presented in Table 1, the countries with the highest number of publications are China (354, 27.00%) and the United States (349, 26.62%). According to the analysis of centrality, from 2000 to 2024, the United States exhibited the greatest centrality score of 0.47, indicating that American scholars hold significant influence in this domain and maintain strong academic connections with researchers globally.

Figure 2

Table 1 displays the top 10 most efficient organizations, comprising of seven Chinese institutions, two American institutions, and one German institution. Goethe University Frankfurt (21, 1.60%) and the Chinese Academy of Medical Sciences (21, 1.60%) stood out as highly productive institutions, highlighting their significant influence in the area of angiogenesis in acute myocardial infarction research (Figure 3A). The data indicates that Chinese Academy of Medical Sciences (0.09) and Nanjing Medical University (0.09) exhibit significant betweenness centrality, indicating their active engagement in collaborations with other institutions. Furthermore, it is evident that China's establishments exhibit a significant degree of collaboration, with fifty percent being ranked among the top 10 most productive institutions. By fully utilizing its regional advantages, China has acquired significant educational influence in this domain. Goethe University Frankfurt had the highest ranking for bursts among monitored institutions, with a burst period from 2003 to 2012 (Figure 3B). It was followed by Stanford University, which experienced a burst from 2011 to 2016, and Southern Medical University, which had a burst from 2020 to 2024.

Figure 3

Analysis of authors

Analyzing core authors is beneficial for investigating the dispersion of documents. When evaluating primary authors, it is important to take into account factors like H-index and the overall count of citations. 8,099 authors published a total of 1,310 publications. From 2000 to 2023, Table 2 showcases a collection of the top ten primary contributors in this field. Stefanie Dimmeler holds the record for the highest number of published articles. Stefanie Dimmeler emerged as the frontrunner with 24 papers and a grand total of 66,942 citations. However, it was Gregory Yoke Hong Lip from the University of Livepool who claimed the top spot with an impressive total of 158,001 citations (n = 158,001) (Table 2). In Table 2, Gregory Yoke Hong Lip and Andreas M. Zeiher had h-index scores of 152 and 138, respectively. Figure 4A depicted the coauthorship relations of a thousand authors. Figure 4A displays the visualization map, illustrating the strong partnership among Stefanie Dimmeler, Ahmed Abdel-latif, and Young sup Yoon. Despite the gathering of many up-and-coming scientists (orange and yellow dots) and teams on the subject (Figure 4A), angiogenesis in AMI continues to be a significant field of fascination. Yung-Lung Chen achieved the highest ranking for author burst monitoring (Figure 4B), with Stefanie Dimmeler experiencing a burst between 2003 and 2004, and Hon-Kan Yip having a burst from 2013 to 2020.

Figure 4

Analysis of journals and and the top 10 high-cited articles

Among the 480 academic journals, the three most prominent scholarly publications are Circulation (occurring 46 times), Circulation research (occurring 37 times), and Plos one (occurring 28 times). Out of the top 15 journals (Table 3), the United States represented 46.67% (7/15), while England accounted for 13.33% (2/15). The top 15 active journals accounted for 24.79% of all publications, with a total of 325 articles being published. Among journals that published more than 14 articles, Circulation had the highest impact factor (IF 2022 = 39.918), closely followed by European heart journal (IF 2022 = 35.855) and Journal of the American college of cardiology (IF 2022 = 27.203). More than 520 citations were received by 50 journals, with Circulation (n = 1,199) and Circulation research (n = 1,015) being the journals with the highest number of citations. According to the findings in Table 3, a more detailed examination of the top 15 frequently referenced journals revealed that together they accounted for 32.82% of all citations.

The overlay of journals in Figure 5, depicted in a dual-map format, illustrated the distribution of topics covered by the journals. All the journals cover different study areas, which are represented by the labels on the map. On the left side of the map, the journals that were cited appeared, whereas the journals that were citing appeared on the right side. Distinct colored lines represent the reference paths, starting from the citation map and ending there. The current map had four primary citation routes. Studies commonly referenced in the journals of Molecular/Biology/Immunology and Medicine/Medical/Clinical were published in the journals of Molecular/Biology/Genetics and Health/Nursing/Medicine. Table 4 comprises the ten most noteworthy studies that garnered significant interest from researchers. Circulation, in which three of the top ten extensively cited original publications were released, exert a notable scientific impact on academic achievement and experts in the domain. Notably, a 2005 study by Werner et al. (15) was given 1,726 citations. The article from Urbich et al. (16) received 1,491 times of citations.

Figure 5

Analysis of co-cited references

The top ten co-cited references related to angiogenesis in acute myocardial infarction are shown in Table 5. With 80 citations, Kai C Wollert had the most overall citations. Second place went to Volker Schächinger with 79 citations. The top ten journals with the highest impact factors were Lancet (IF 2022 = 202.731), New England Journal of Medicine (IF 2022 = 176.079), and Nature Medicine (IF 2022 = 87.241), according to the rankings.

The study of the co-citation network is visually depicted in Figure 6A. The analysis revealed that the modularity Q achieved a value of 0.7407, while the weighted mean silhouette S showed a remarkable score of 0.9146, indicating a robust clustering effect and a uniform network. CiteSpace employed 45,911 co-cited references, employing a year as the temporal segment, encompassing the period from 2000 to 2023. The chosen subset consisted of the top 10% of extensively cited references, which were utilized to illustrate the co-citations (Figure 6B). Additionally, Figure 6B presents the co-citation references in a chronological view. The Figure 6B illustrates the evolution of research trends over time. According to the clustering results, it could potentially be divided into 13 clusters. A reference timeline was used to visualize areas of research hotspots. The cluster labels were assigned based on the most common terms found in each cluster. According to Figure 6B, cluster #0 (stem cell from bone marrow), #2 (progenitor of blood vessels), #4 (cell that gives rise to blood vessels), #6 (factor that promotes liver cell growth), #8 (complication of diabetes related to blood vessels), and #10 (process of maintaining balance) initiated earlier. On the other hand, cluster #1 (exosome released by cells) and #5 (maintenance of heart stability) are still in progress, indicating they are at the forefront.

Figure 6

Keyword analysis

A grand total of 4,384 keywords were extracted, with 261 occurring a minimum of ten times and 50 occurring a minimum of 50 times. With the exception of “angiogenesis” and “acute myocardial infarction”, it is evident that transplantation emerged as the predominant term (n = 228), closely followed by endothelial progenitor cells (n = 219) and progenitor cells (n = 197). Figure 7A displays overlay maps consisting of circles and labels to represent high-frequency keywords, with each cluster represented by a different color. Figure 7A displays five separate research directions represented by clusters that are colored red, green, blue, yellow, and purple. The main keywords of red cluster are endothelial growth factor, apoptosis, inflammation and atherosclerosis. The green cluster is characterized by the presence of endothelial progenitor cells, progenitor cells, and mesenchymal stem cells. Blue cluster is characterized by heart, cardiomyocytes and repair. Ischemia, blood flow, and arteriogenesis are the main focus of the yellow cluster. Purple cluster mainly include neovascularization, regeneration and mobilization. The intensity of the bursts in the keywords served as a notable indication of the frontiers, focal points, and developing patterns in the study as time progressed. Keyword bursts are frequently cited keywords that have been significantly mentioned over time. According to Figure 7B, the extracellular vesicle exhibited the most intense bursts (strength = 13.62), followed by colony stimulating factor (strength = 10.74) and inflammation (strength = 9.18). It is noteworthy that the study fields “injury” (2016–2023), “extracellular vesicle” (2017–2023), “inflammation” (2017–2023), “mechanism” (2017–2023), “activation” (2018–2023), “migration” (2018–2023) and “microrna” (2020–2023) are in burst until 2023, indicating that some study areas have recently been given considerable attention.

Figure 7

Discussion

We analyzed and summarized the key contents covered by the original articles and review articles included in this study. Original research articles focus on emerging strategies for therapeutic angiogenesis after myocardial infarction, and scholars around the world are actively using cutting-edge molecular biology methods to explore different angiogenesis stimulation therapies to improve the long-term prognosis of patients with myocardial infarction. The important contents of original research articles are summarized as follows: Encouraging angiogenesis in the infarcted region is crucial for treating the aftereffects of AMI by reestablishing blood flow. In summary, these studies highlight various therapeutic strategies aimed at enhancing angiogenesis and improving cardiac function following acute myocardial infarction, including MSC therapy, exosomes, growth factors, and pharmacological agents. These approaches are underpinned by molecular mechanisms like VEGF signaling, miRNA regulation, and the SIRT1/mTOR pathway. Meanwhile, these studies investigate various therapeutic strategies to promote angiogenesis and improve heart function following AMI in animal models, focusing on different agents, such as traditional herbal remedies, Tie-2 receptors, low-intensity pulsed ultrasound (LIPUS) therapy, and bone marrow mesenchymal stem cell (BMEC)-derived exosomes (MSC-Exo). Gene therapy and biological factors are crucial in heart repair, with biological factors being more effective but having issues like a short half-life and easy inactivation. Overall, these studies demonstrate several promising approaches—growth factors therapy, gene therapy, biomaterials, herbal supplementation, Tie-2 modulation, MSC therapy, and exosome treatments—as viable options to enhance angiogenesis and mitigate heart tissue damage following AMI. There is a continued need to examine the therapeutic mechanisms driven by these novel approaches, especially when the molecules impacting the disease are not yet known. Even though there are several industrialization challenges for MSCs and exosomes, their potential in functional research, diagnosis, and treatment of diseases like AMI is evident. Additionally, there is still a great deal to discover about drug carriers and regenerative medicine and treatments, which have vast potential for growth in the future.

Review articles focus on the pathophysiological mechanisms of angiogenesis after myocardial infarction and its molecular signal transduction pathways. The key points of the review articles are summarized as follows: AMI causes significant damage to the coronary microcirculation, resulting in vascular rupture and capillary rarefaction. Tissue repair after AMI involves a strong angiogenic response that starts from the infarct edge zone and expands to the necrotic core area. Technological advances have provided new mechanistic understanding of angiogenesis after AMI, which may become a target for improving cardiac function. Studies have shown that new capillary structures are mainly formed by angiogenesis sprouting from existing endothelial cells (ECs) in the infarct edge zone, with little contribution from non-ECs. Single-cell RNA sequencing showed that ECs in infarcted hearts can be divided into clusters with different gene expression signatures, which may reflect functionally different cell populations. EC-specific multi-lineage tracing revealed clonal expansion of EC subpopulations after AMI. Tissue repair involves the interaction of multiple cell types, mainly through secreted proteins and their receptors. Although we are just beginning to understand the complexity of this intercellular communication, macrophages and fibroblast populations have emerged as the main drivers of the angiogenic response after AMI. Animal data support the concept of enhancing the endogenous angiogenic response after AMI to reduce scarring and adverse left ventricular remodeling. Thus, an improved understanding of infarct angiogenesis creates multiple therapeutic opportunities. In preclinical development, all proangiogenic strategies should be tested in animal models that replicate the cardiovascular risk factors and pharmacological treatments commonly prescribed to patients with acute MI. Given that most patients now do well after AMI, clinical translation will require careful selection of patients who require proangiogenic treatment.

General information

The estimation of research advancements in angiogenesis in AMI can be based on the quantity and pattern of yearly publications. The study analyzed a total of 1,310 publications from 2000 to 2024, which consisted of 1,021 articles (77.88%) and 289 reviews (22.06%) sourced from 480 different journals. Based on CiteSpace and VOSviewer software, we implemented a bibliometric analysis to analyze studies related to the field of angiogenesis in AMI published in the WoSCC database. China has made the largest contribution to this field compared to many other countries. China, with a combined total of 354 articles, stands out as the most industrious nation due to its possession of four out of the five leading productive institutions (Chinese Academy of Medical Science, Chang Gung University, Nanjing Medical University, and China Medical University) and four out of the ten most productive researchers. Moreover, the close partnership between China and other nations has significantly contributed to the advancement of global communication and academic growth in this particular domain. Studying author collaborative networks helps comprehend influential scholars and the collaborative bond among researchers. Stefanie Dimmeler, hailing from Germany, emerged as the foremost author in terms of publication count. Stefanie Dimmeler's works have predominantly appeared in prestigious publications such as the European Heart Journal, Circulation, and Nature Communications. The most influential publication by Stefanie Dimmeler, titled “Endothelial progenitor cells: characterization and role in vascular biology”, was published in Circulation Research in 2004 (16). Their view showcased the crucial involvement of endothelial progenitor cells in neovascularization, also known as angiogenesis, among patients diagnosed with coronary artery disease. According to their report, it is possible that the mechanism is connected to the discharge of proangiogenic substances in a paracrine fashion, suggesting that the circulating cells that give rise to endothelial cells have the ability to save ischemic tissue (16). In 2006, Stefanie Dimmeler and his colleague, Gian Paolo Fadini, updated advances in the clinical application of endothelial progenitor cells in the treatment of ischemic heart disease in a review titled “Critical Reevaluation of Endothelial Progenitor Cell Phenotypes for Therapeutic and Diagnostic Use” in the Circulation Research. This study summarized the powerful differentiation capacity of endothelial progenitor cells allows them to display dynamic cellular phenotypes across time and space (25). In addition, a detailed biological functional characterization of endothelial progenitor cells using directed differentiation cell culture assays is meaningful, which can help to explore the potential of endothelial progenitor cells as biomarkers for predicting cardiovascular disease risk (25).

Research hotspots and emerging frontiers

The term “Keywords with strongest citation bursts” refers to the timeframe in which the related research received extensive citations. It implies that the researchers have given careful consideration to the documents, potentially emphasizing the ongoing change and trends in this domain. Analysing the role of angiogenesis's involvement in AMI research can be achieved by identifying the strongest citation bursts associated with a specific keyword. In this case, CiteSpace primarily focused on the research topics of “injury”, “extracellular vesicle” and “inflammation”.

Microvascular injury after AMI

Although PCI can open the lumen of narrowed or even occluded coronary arteries in time to restore myocardial perfusion and save ischemic myocardial tissue (3, 4). However, it has been shown that even after opening acute epicardial vessel occlusion, about half of the AMI patients suffered coronary microvascular dysfunction (CMD), which severely compromises the clinical benefit as well as the long-term prognosis of patients (26). CMD refer to the structural and functional impairment of coronary microvessels, resulting in reduced coronary blood flow levels and ultimately myocardial tissue ischemia in the donor region (27). According to prior research, PCI has been found to successfully achieve TIMI flow class III in 95% of STEMI patients. However, approximately 50% of patients are unable to restore proper perfusion in the distal coronary microcirculation, leading to the development of coronary microcirculation disorders. These disorders are associated with adverse prognostic events, including heart failure and cardiac death (28). The main manifestations of coronary microcirculatory ischemia/reperfusion injury are microvascular obstruction, cellular occlusion, and extravascular compression (e.g., edema and intramyocardial hemorrhage), which are mainly caused by atherosclerotic plaque occlusion in distal coronary arteries (29). Prolonged ischemia of the epicardial coronary arteries leads to irreversible damage to the coronary microvascular endothelium within the downstream perfused region (30). Animal studies conducted previously have indicated that the microvascular network in the boundaries of the infarct remains intact in terms of its fundamental physiological structure, while the microvascular network in the central region of the infarct has suffered complete destruction (31). It is striking that reactive oxygen species generated during ischemia-reperfusion and immune cell-derived pro-inflammatory cytokines in subsequent injury repair are both promoters of vascular endothelial cell injury and extracellular messengers that activate angiogenesis within the infarct margin (32, 33). Precise therapeutic approaches for endothelial cell damage in CMD is lacking, however, there is great anticipation for research on strategies to manage myocardial infarction with non-obstructive coronary arteries (MINOCA) and ischemia with non-obstructive coronary artery disease (INOCA) (34).

Triggers of postinfarction angiogenesis

Hypoxia acts as a strong inducer of angiogenesis in development, the equilibrium of adult tissues, and various diseases. Hypoxia-inducible factors (HIF-1 and HIF-2) are strongly expressed in the endocardium and epicardium near the necrotic infarct center and infarct border zone, enhancing capillary density and blood flow in the infarct area to promote angiogenesis after infarction (35). Moreover, recruitment of a great amount of inflammatory cells is necessary for tissue lysis and resorption during the coagulative necrosis process of myocardial tissue in the infarct core (36). On the one hand, neutrophils, the earliest natural immune cells involved in the necrotic process, release large amounts of lysosomal enzymes to hydrolyze the organelles, subcellular organelles, and fragmented nuclei in the necrotic core and finally absorb them through the blood vessels and lymphatic vessels (36, 37). On the other hand, the infiltration of large numbers of leukocytes will also release large amounts of inflammatory factors that will further cause damage to the myocardial tissue in the infarct border zone, and even eventually cause ventricular remodeling and left ventricular dilatation (38). In addition, critical for angiogenesis, vascular endothelial growth factor alongside placental growth factor (PGF) play essential roles, with studies indicating that, following MI in rats, endothelial cells within the infarct area express VEGFR2 for at least 7 days (39).

Applications of therapeutic angiogenesis in cardiac injury

The repair of post-ischemic injury also relies on angiogenesis, which involves the creation of new blood vessels from existing ones. As a cellular therapy to rescue ischemic myocardium, promoting angiogenesis is a potential way to improve left ventricular dysfunction after ischemic myocardial injury (40). This is achieved mainly through the stimulation of vascular endothelial cells within the infarct border zone to generate blood vessels. According to recent research, the primary physiological foundation of angiogenesis involves the stimulation, growth, and movement of vascular endothelial cells, along with the development and reinforcement of newly generated sprouts (12, 41). This is a complex multistep process involving multiple cells. When the myocardium is chronically ischemic, firstly, the small arteries in the coronary vascular network are anastomosed with each other (42). Then a new collateral circulation is established, which bypasses the myocardial tissue at the site of blood flow interruption. Eventually, the blood supply status of the distal ischemic tissue is improved (42). However, after myocardial infarction, the myocardium itself can trigger an angiogenic response that differs from the endothelial progenitor cell differentiation during embryonic development (43). Ischemic myocardium recruits endothelial progenitor cells to infiltrate the ischaemic zones, which subsequently differentiate into mature endothelial cells. In another regulatory mode, the myocardium regulates the adjacent endothelial cells by paracrine regulation, which proliferate into a new capillary network at the site of injury (44). However, the pro-angiogenic capacity possessed by ischaemic myocardium following myocardial infarction is limited (45). Therefore, the proangiogenic therapy of ischemic border zone is considered a promising therapeutic strategy to improve cardiovascular function after AMI. Analysis of key terms indicates that the research interest is gradually transitioning from treating cardiovascular conditions with mesenchymal stem cells (MSCs) to exploring the heart-protective functions and molecular mechanisms of MSC-exosomes.

Properties of MSCs in biology and its role in ischemia

Adult mesenchymal stem cells (MSCs) are self-renewing and have multi-directional differentiation potential. MSCs, under appropriate induction conditions, have the ability to transform into different types of tissue cells including bone, cartilage, adipose tissue, tendons, muscles, and nerves (46, 47). Currently, stem cell transplantation is an important tool for therapeutic angiogenesis. Most recent cell transplatation technologies for treatment of ischemic diseases are still in preclinical research phase, including haematopoietic stem cells, vascular endothelial cells and MSCs (48). Notably, MSC has advantages such as easy to obtain, along with simple to amplify and easy to genetically modify, which makes them highly advantageous in the treatment of ischemic diseases (49). Based on their origin, MSCs are categorized into varieties such as those from bone marrow (BMMSCs), adipose tissue (ADSCs), and the umbilical cord (ucMSCs) (50). Previous genomic and proteomic analyses have shown that MSCs can secrete more than 200 pro-angiogenic substances, of which soluble vascular growth factors have received the most attention (51). The secretion of vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), and hepatocyte growth factor (HGF) by mesenchymal stem cells (MSCs) is crucial for the migration of vascular endothelial cells and the formation of blood vessels (52). Gnecchi et al. illustrated that injection of MSC pretreatment medium into the residual surviving myocardial tissue of rats after myocardial infarction for 72 h reducted the infarct size of in rats and decreased the proportion of apoptotic myocytes (53). Kamihata et al. demonstrated that after MSC were transplanted into the ischemic myocardial region in AMI pigs for 3 weeks, capillary density in this ischemic region was increased and collateral perfusion was improved (54). Additionally, numerous recent studies have shown that MSCs primarily aid in restoring cardiac function through their paracrine effects, particularly involving the role of exosomes (55, 56).

The role of exosomes in MI

Exosomes, varieties of extracellular vesicles, are formed by the release of intracellular endosomes into the extracellular compartment by cytosolic vomiting (57). They range from approximately 30–150 nm in diameter and have a cup-like morphology. Investigations have revealed that exosomes are packed with various bioactive compounds, including proteins, lipids, and genetic elements (58). They selectively attach their membrane proteins to ligands on the target cell membrane, facilitating intercellular communication through the transfer of bioactive molecules (59). At the same time, exosomes can help target-cells perform a large number of cellular functions, including cell proliferation or cell differentiation, angiogenesis, stress response and immune signalling (60). Chen et al. demonstrated that exosomes improved cardiac remodelling, inhibited collagen deposition, promoted angiogenesis and thus reduced infarction rate in infarcted rats (61). Geng et al. found that exosomes extracted from the serum of AMI patients were closely associated with the repair and regeneration of cardiac tissue after MI (62). Ribeiro-Rodrigues et al. illustrated that exosomes isolated by cardiomyocytes under ischaemic conditions exhibit high levels of MMP, which promotes endothelial cell proliferation and sprouting (63). In addition, their results showed that ischaemic-exosomes were relatively rich in miR-222 and miR-143, which exerted a partial pro-angiogenic effect after myocardial infarction (63).

The mechanisms of MSC-exosomes in angiogenesis

Numerous studies have demonstrated that MSC- Exosomes are capable of suppressing programmed cell death (PCD) and fibrosis, promoting blood vessel formation, and ameliorating the ischemic myocardial microenvironment (64). Wang et al. found that MSC-EVs contain high levels of miR-210, and following treatment with MSC-EVs, there is a reduction in the expression of the target gene Efna3 in HUVECs. Therefore, the pro-angiogenic activity of the MSC-EVs might be linked to a mechanism dependent on miR-210-Efna3 (65). Another study discovered that transplanting exosomes containing miR-132 into the ischemic hearts of mice significantly promotes neovascularization around the infarcted area by targeting RASA1, thereby protecting cardiac function (66). Further research indicates that in HUVECs treated with ADMSC-Exosomes, there is an upregulation in the expression of the angiogenic genes Ang1 and FLK1, and a downregulation of the anti-angiogenic gene Vash1 and TSP1. Concurrently, miR-125a enhances angiogenesis through the suppression of the vascular growth inhibitor DLL4 (67). Experiments with a chronic ischemic pig model revealed that BMMsc-Exosomes enhance capillary and arteriolar growth by upregulating the MAPK and AKT/eNOS signaling pathways, which improves blood flow in ischemic myocardial tissues and increasing cardiac output (68). By targeting ADAMTS16, the upregulated miR-29b-3p delivered by BMMsc-Exosomes improves myocardial angiogenesis and remodeling in MI rats (69). Following myocardial infarction, miR-543 in exosomes derived from human mesenchymal stem cells targets COL4A1, thereby facilitating the proliferation, migration, invasion, and angiogenesis of heart microvascular endothelial cells (70). To conclude, there is no doubt that MSC-Exosomes have a profound ability to ameliorate cardiac function and advance angiogenesis.

Limitations

This paper presents a bibliometric study on angiogenesis in AMI, which is being presented for the first time. However, it is important to acknowledge certain limitations. Initially, the deadline for the research investigation was established as January 2nd 2024; however, due to ongoing publications in the WOS database, new studies were excluded from the final bibliometric collection. Additionally, our research solely focused on articles and reviews due to limitations in methodology and software algorithms, thus excluding other forms of studies that explored angiogenesis in AMI. Furthermore, the variability in the quality of the publications contained within the WOS database, along with researchers' varying emphasis on different research focal points at different periods, could potentially diminish the precision of the topological analysis.

Conclusion

A bibliometric analysis was conducted on the knowledge map, hotspots, and frontiers of AMI research related to angiogenesis. China and the United States remain leaders in this field, showcasing their scholars' remarkable academic impact and productivity. Stefanie Dimmeler from Goethe University Frankfurt was the main writer who exerted a significant scholarly impact on the discipline. The current research included important journals such as Circulation, European Heart Journal, New England Journal of Medicine, and Journal of the American College of Cardiology. Moreover, we determined the management strategies for microvascular injury after AMI and therapeutic angiogenesis as research spotlight in the future.

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