Role of Macrophages in Vascular Regeneration

AUTHORS

Shirin Saberianpour 1 , *

1 Vascular and Endovascular Surgery Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

How to Cite: Saberianpour S. Role of Macrophages in Vascular Regeneration, Multidiscip Cardio Annal. 2021 ; 12(1):e106056. doi: 10.5812/mca.106056.

ARTICLE INFORMATION

Multidisciplinary Cardiovascular Annals: 12 (1); e106056
Published Online: December 6, 2020
Article Type: Review Article
Received: June 13, 2020
Accepted: October 17, 2020
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Abstract

Angiogenesis is very important for most strategies for regenerative damaged organs. The natural inflammatory response can be affected by the activity of different types of macrophages and their cytokines. Macrophages exist in a wide variety of phenotypes. These macrophages can range from classic M1 to M2 macrophages. M2 macrophages themselves can include different types of subgroups. These types of macrophages are usually effective in vascular regeneration while M1 or classic macrophages play a role in chronic wounds. The macrophages move toward the M2 phenotype or inhibit the polarization of the macrophages toward the M1 phenotype. On the other hand, macrophage polarization can be affected by a variety of factors, such as different types of miRNAs. The process of vascular repair and enhancing the therapeutic potential of drug regulators the treatment of vascular damage through modification of macrophage polarization. Macrophages do this by various mechanisms, which are described in detail in this study. Finally, new therapeutic mechanisms aimed at macrophages in vascular disease are discussed.

1. Context

Inflammation is a complex process in which cells and various factors in a certain way protect tissues against various injuries. In fact, inflammation is a controlled outcome between inflammatory and anti-inflammatory factors during which the activity, proliferation, and chemotaxis of cells are regulated. Proliferation has a large number of inflammatory cells, blood vessels created by vasodilation, and a number of inflammatory mediators. There is also an area of damaged tissue that is deficient in relative oxygen, which is associated with vascular growth. In the process of inflammation, a set of cells and chemical agents are involved. In addition to involving endothelial cells, the angiogenesis process also involves other cells, including inflammatory cells. Among the cells, macrophages are very important. These cells are involved in the process of angiogenesis due to growth factors. These factors connect leukocytes to vascular endothelium and initiate the repair process. During injury, monocytes guide a number of inflammatory mediators and chemical agents to migrate to the affected area to activate macrophages, inflammatory agents and a number of R Factors. They help to repair the environment by causing damage to cells such as the endothelium, epithelium, or mesenchymal. They provide the conditions for tissue repair and angiogenesis. The role of macrophages in changing the polarization of these cells in improving angiogenesis has been described (1, 2).

2. Macrophage Phenotypic Diversity

Due to their phenotypic diversity, macrophages also show different functions in homeostasis. Different types of macrophages play a key role in guiding the immune response at different physiological stages, including growth, injury, and chronic inflammation. In addition, tissue-resident macrophages in many organs have unique gene profiles (3). And it performs the specific tasks necessary for a healthy body function (4). Significant advances in the design of specialized cellular diagnostic techniques have led to the specialized diagnosis of immune cell phenotypes, including macrophages. This leads to a deeper understanding of the different phenotypes of macrophages. Their origin and phenotype should be discussed (4, 5).

Macrophages can form different types of phenotypes under different factors. M1 phenotypes are usually formed under the influence of different cytokines such as IFN-γ, TNF-α and LPS to M1 phenotype, and in contrast to M2 macrophages which are formed under the influence of IL-4 cytokines and IL-10. These anti-inflammatory cytokines improve the angiogenesis process. In terms of metabolic pathways, M1 macrophages obtain energy from glycolysis and arginine pathways. M2 macrophages obtain their energy through oxidative pathways. M2s are classified according to their broad classification. For example, M2C usually represents inflammatory macrophages that suppress inflammatory cytokines (6-12).

3. Angiogenesis/Vascularization

Blood vessels deliver oxygen, metabolites, export wastes, and the formation of new blood vessels that is essential to improve tissue function after ischemia or tissue damage (13, 14).vascular function is undeniably associated with the preservation and repair of the damaged vascular (14). Endothelial precursor cells (EPCs) are involved in newly formed capillaries and stimulate ischemic tissue vessels (15). Endothelial precursor cells are transported from the bone marrow to the site of vascular injury, playing an important role in postoperative vascular repair. Biomechanical tracking Research shows that bone marrow-derived cells with EPC cell markers play an important role in vascular healing (16). One of the advantages of using EPC in vascular healing is the physical formation of new capillaries, which regulate processes such as angiogenesis during inflammation and recovery with the effect of paracrine (17). Like fat-producing hematopoietic cells, bone marrow, cells of mesenchymal origin, paracrine VEGF factors such as increase angiogenesis (18).

4. The General Role of Macrophages in Regeneration

There is considerable evidence that macrophages are key regulators of the angiogenesis process. They play different roles to ensure proper regeneration (19). It is established that the macrophage phenotype evolves the angiogenesis process (20). In an acute injury, with the onset of tissue repair, a large number of macrophage populations are transmitted to the injured place (21). Endothelial cells restore the vessels. This process eventually results in angiogenesis repair and scarring (22). Recently, an important molecular mechanism has been discovered in M2 macrophages that promotes angiogenesis, permeability, and the absorption of inflammatory cells in various human diseases. It can initiate angiogenesis from various mechanisms. This process itself causes HIF1α and VEGF-A (23, 24).

5. Paracrine Roles of Types of Macrophages in Angiogenesis

Macrophages secrete a variety of growth factors associated with angiogenesis (12). The secretion of VEGF-A by macrophages is important for the stimulation of angiogenesis in the repair of damaged tissues. Also, the polarization of macrophages will cause the secretion of growth factors that can again affect the angiogenesis process (25). By analyzing gene expression and angiocrine secretion profiles from different macrophage phenotypes, it was shown that M1 macrophages expressed genes involved in the onset of angiogenesis, including VEGF-A and FGF2 (12, 26) Studies have shown that M2a macrophages are able to secrete high levels of PDGF factor, while M2c macrophages secrete high levels of MMP-9, according to a study that analyzed macrophages within collagen scaffolds. It was shown in mice that different phenotypes were involved in the angiogenesis process (12, 27). Collagen scaffolding with macrophages can reduce the strength of angiogenesis because collagen scaffolding can act as a scaffold around the M2 macrophage to prevent it from working (28). In contrast, glutaraldehyde collagen scaffolds improve angiogenesis by using both M1 and M2 macrophages (29). M1 macrophages play a role in stimulating capillary germination, while M2 macrophages help stabilize arteries (30). Strategies for controlling macrophage dynamics may achieve more effective angiogenesis (30). In one study, concomitant delivery of CSF1 with VEGF-A in hydrogel implants resulted in stronger angiogenesis than VEGF-A alone (31). Therefore, it is important to consider which type of cell is in a ruler. Dynamic growth regulation and regeneration and how different cell types work together are important for angiogenesis process (32).

6. Macrophage Interactions with Other Cells for Enhancement of Angiogenesis

Macrophages with a number of other cells including endothelial cells, pericytes, and vascular smooth muscle cells are involved with inactive cells in cell-cell interactions (33, 34). These interactions regulate angiogenesis during embryonic development and in response to injury. Macrophage depletion in injured tissue leads to impaired vascular patterns that can be due to insufficient vascular repair. Phagocyte ability of macrophages has been shown to orient cell and cell communication with endothelial cells, which can be a bridge between two or more angiogenic buds (35, 36). In studies of the brain, brain cells and mouse development macrophage were connected with endothelial cells fusion (37, 38). Macrophages also influence the behaviors of vascular smooth muscle cells that are associated with the growth and remodeling of microcirculation (38). Recent studies have shown Macrophage polarization can be a good therapeutic goal to enhance repair in ischemic tissue areas (39).

7. Macrophage Differentiation into Vascular Cells

Macrophages may be able to differentiate vascular wall cells, including vascular smooth muscle cells, peritonitis, and endothelial cells (40). Smooth vascular muscle cells that inhabit the middle layer of large blood vessels can respond to damage in macrophages and mesenchymal stem cells (41). Macrophages are able to differentiate macrophages into SMCs (42). In the regulation of tumor angiogenesis, bone marrow-derived cells have been shown to be differentiated both in the peripheral environment and in macrophages. Distinguishing macrophages from peritonitis or macrophages to fibroblasts can have important implications for regulating angiogenesis fibrosis is an important factor (43). The expression of endothelial markers characteristic of CD31, VEGFR2, by a subset of monocytes, called myeloid vascular cells (MACs), provides another explanation for the observed phenotypic overlap (44). While MAC has been shown to play an angiogenic role and could serve as an alternative to angiogenesis M2 macrophages, their inability to differentiate into endothelial cells is a drawback to their use (45, 46).

8. Exosome‐Guided Phenotypic Switch of M1 to M2 Macrophages for Angiogenesis

A method of induction of macrophage polarization is the use of exosomes. Using exosomes has been proposed to directly convert M to M2 for effective angiogenesis. Pre-inflammatory M1 macrophages release a wide range of pre-inflammatory exosomes after damage (47). M1-Exosome exerts an anti-vascular effect. They also showed highly inflammatory miRNAs such as miR-155. miR-155 can be transferred to endothelial cells (ECS) and lead to inhibition of angiogenesis by regulating genes at reducing the angiogenic ability of ECs (48). Recent studies suggest that exosomes secreted by mesenchymal stem cells may be a new mechanism for the beneficial effect of MSCs transplantation after myocardial infarction. Studies showed that MSC-Exosome impairs myocardial in mice through miR-182 shuttles, which reduces the induction of macrophage polarization. Another study showed a new way to use MSC-Exosome as a potential treatment tool for angiogenesis (49, 50).

9. miRNA-Mediated Macrophage Polarization

Non-coding miRNAs are small molecules’ that can regulate gene expression and network cellular processes (51). The gene and cellular regulators associated with miRNA in macrophage polarization were developed using microarray and RT-Qpcr techniques. miRNAs that modulate the polarity of macrophages may have the potential to treat inflammatory diseases. Recent findings in the expression of miRNA expression in polar macrophages of mice and human resources and a summary of how these miRNAs are regulated polarization of macrophages (Table 1) (52, 53).

Table 1. lists some of these miRNAs
PolarizationmiRNA
M1miR-181a, miR-204-5p, miR-451, miR-125a-3p, miR-125a-3p, miR-155, miR-127, miR-155, miR-125b, miR-9, miR-155-5p
M2miR-125-5p, miR-125a-5p, miR-223, miR-146a, miR-132, MiR-34a, miR-146a-3p, miR-125a-5p, miR-124

10. Signaling Pathway in Angiogenesis by Macrophages

Studies have shown that both macrophages and proteins secreted in the Wnt signaling pathway regulate angiogenesis. Therefore, according to observations, some macrophages mediate the effects of angiogenesis, and in fact, macrophages represent Wnt ligands (54). Interferon IFN-γ and lipopolysaccharide (LPS), two potent inflammatory agents known to regulate Wnt5a protein levels in macrophages. In addition, Wnt5a can automatically control regenerative signaling (55, 56). Given that Wnt5a inhibits the expression of several inflammatory cytokines in endothelial cells, including IL-6 and IL-8, the Wnt5a factor has a direct effect on endothelial cell proliferation, migration, and Tie-2 expression (57). It is therefore assumed that Wnt5a, derived from macrophages, regulates angiogenesis through two direct and indirect mechanisms at different levels. In addition, Wnt5a has also been shown to regenerate macrophage chemotherapy protein, CCL2, in endothelial cells. It is possible that macrophage-derived Wnt5a could be indirectly conductive. Macrophages are involved in these vessels and the genetic approaches involved reduce the risks of macrophages that can destroy the regeneration and persistence of these vessels after delivery. Further investigation showed that the secretion of conventional Wnt protein macrophages, Wnt7b, is necessary for this process. In particular, the secretion of Ang-2 from the peritonitis causes Wnt7b expression in macrophages (58, 59). Wnt7b can stimulate the entry of vascular EC into phase S of the cell cycle (58). Angiopoietin-2 secretion inhibits Angiopoietin-1-mediated survival signaling in the endothelial cell, as well as β-catenin signaling to induce cell cycle entry and subsequent apoptosis (60).

11. Macrophages as a Potential Target for Vascular Disease

Different therapeutic agent, which has been used in the generation, is anticipated to help researchers solve more clinical problems. A number of these therapeutic agents are performed to improve vascular disease and with the aim of macrophages. A number of these factors can help polarize macrophages in the position of vascular damage. The following table examines a number of these factors and therapeutic mechanisms. (Table 2)

Table 2. A number of Vascular Diseases Aimed at Macrophages
DefectionMechanismReferences
Chronic kidney disease (CKD)VEGF therapy was largely driven by modulation of renal macrophages toward VEGF-expressing M2 phenotype(61)
Intimal hyperplasiaDecreasing the miR-150 increases the high ratio of macrophages to M1 to M2, which in turn will cause hyperplasia.(62)
Atherosclerosis Different macrophage phenotypes have different effects on plaque progress.(63)
WoundsMesenchymal cells can stimulate the functional repair of vascular endothelial cells by regenerating macrophage phenotypes(64)
Peripheral Artery Disease Increased expression of VEGF165b in macrophages causes a M1-like phenotype that directly interferes with angiogenesis.(65)
Abdominal aortic aneurysm (AAA)Montelukast induces M2 macrophage polarization and prevents AAA formation(66)
Choroid neovascularizationMetalloproteinases–3 (TIMP-3) as a pro-angiogenic microenvironment, playing a modulating M2 polarization.(67)
Intracranial aneurysms Prostaglandin E receptor subtype 2 (EP2)antagonists in macrophages (68)

12. Conclusions

In recent years, studies on the role of macrophages in the process of many injuries have been studied. One of the most important aspects is to study the polarization of macrophages in the face of various physiological situations. The polarization of macrophages can be affected by internal or external factors. Macrophages themselves can control repair processes by using their own function or by secreting extracellular material. Macrophages play a major role in the repair of vascular structures. It can occur during vascular disease by modifying macrophage polarization and factor secretion.

Acknowledgements

Footnotes

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