Inflammation in Coronary Microvascular Dysfunction: Comparison
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Chronic low-grade inflammation is involved in coronary atherosclerosis, presenting multiple clinical manifestations ranging from asymptomatic to stable angina, acute coronary syndrome, heart failure and sudden cardiac death. Coronary microvasculature consists of vessels with a diameter less than 500 μm, whose potential structural and functional abnormalities can lead to inappropriate dilatation and an inability to meet the required myocardium oxygen demands. 

  • coronary microvascular dysfunction
  • atherosclerosis
  • imaging
  • biomarkers
  • risk factors
  • anti-inflammatory treatment

1. Introduction

Ischemic cardiac pain in the context of non-obstructed epicardial coronary arteries, a phenomenon frequently encountered in clinical cardiology practice, has been recognized as a clinical entity of increased cardiovascular risk when compared to control subjects [1][2], contrary to initial theories suggesting a nonthreatening disease progression [3]. Coronary microvascular dysfunction (CMVD) consists of the main etiologic factor of peripheral ischemia with “normal” epicardial coronary arteries. However, no definitive data exist on the pathophysiology, diagnosis and treatment of CMVD.
Coronary microvasculature consists of vessels with a diameter less than 500 μm, whose remodeling due to various stimuli could lead to structural and functional abnormalities and, consequently, result in inappropriate dilatation and the inability to meet the required oxygen demands. Known cardiovascular risk factors, such as diabetes mellitus and arterial hypertension, are implicated in this process due to their deleterious vascular effects. Ultimately, patients with CMVD could progress to a phenotype of heart failure with preserved ejection fraction, with variable prognosis due to a lack of disease-specific treatment [4].
Chronic low-grade inflammation is undoubtedly involved in coronary atherosclerosis. Importantly, favorable cardiovascular outcomes have been reported in recent trials of patients with documented coronary artery disease (CAD) receiving either broad based or target anti-inflammatory treatment [5][6][7]. Contemporary evidence suggests that an inflammatory background is also responsible for the development of CMVD [8]. Therefore, we review the latest data regarding CMVD epidemiology and diagnostic approach while elaborating on the speculated effects of inflammation and the potential therapeutic implications of immunomodulatory agents.

2. The Role of Inflammation in the Pathogenesis of CMVD

2.1. Principal Pathophysiologic Mechanisms

Evidence from studies in autoimmune rheumatic diseases have stressed the decreased nitric oxide (NO) bioavailability together with the high assembly of reactive oxygen species (ROS) as the link between the pro-inflammatory state and endothelial dysfunction observed in CMVD [9]. CMVD can be maintained by a variety of physiological processes that result in either impaired dilatation or enhanced constriction of coronary microvessels [9]. Following endothelial dysfunction, the ensuing inflammation and immune system dysregulation are driving forces accelerating the atherosclerotic process, consequently affecting the microvasculature. Several chemokines and cytokines are involved, with interleukin IL-1, IL-6 and TNF-α being crucial mediators of the inflammatory cascade [10]. Systemic inflammation is further exacerbated by pro-inflammatory circulating microparticles, which are believed to be responsible for NO modulation and cytokine release as well as monocyte recruitment [11]. These modifications eventually impede myocardial blood flow ability to adjust to variations in myocardial oxygen demand. Impaired vasodilation can be a result of either non-modified risk factors such as diabetes, obesity, and hypertension or either endothelium–independent mechanisms, referring to the development of nitrate resistance due to decreased cyclic GMP production [12]. The exacerbation of secreting oxygen species in contribution with reduced NO bioavailability drive a chain reaction of signaling events that promotes heart fibrosis and myocyte stiffness [13].
The normal coronary physiology is disrupted to varied degrees as a result of CMVD. Patients with hypertrophic cardiomyopathy and those with arterial hypertension have structural abnormalities that are responsible for the development of CMVD [14]. In patients with non-obstructive coronary disease, dysfunction of microvasculature can be a result of several factors, such as increased heart rate, reduced diastolic time, decreased driving blood pressure, and left ventricular inotropism, which need to be considered when assessing microvascular function. Finally, the coronary blood flow linearly affected by the pulsative pattern of the heart and the intramyocardial and intraventricular pressures. As such, abnormalities in the diastolic phase of the cardiac cycle altered the myocardial perfusion [12][15].

2.2. Hypertension

Chronic low-grade systemic inflammation seen in the cluster of comorbidities (i.e., diabetes mellitus, obesity, arterial hypertension) that are considered risk factors for CMVD merits specific attention [16][17] (Figure 1). Arterial hypertension increases the likelihood of death from ischemic heart disease over time. In developed countries, at least 30% of individuals have a history of hypertension, and it is independently related to poor cardiac prognosis following an acute myocardial infarction (MI) [18]. Severe microvascular damage inside the infarct zone presents promptly as microvascular blockage and affects approximately half of all STEMI patients. In patients with persistent microvascular obstruction, progressive irreversible capillary degradation occurs, leading to infarct zone hemorrhage, which is an independent predictor of death or heart failure long-term [19][20]. The underlying pathophysiology includes inflammatory stimuli paired with increased activation of the renin–angiotensin–aldosterone system, resulting in endothelium-dependent CMVD by recruiting cell adhesion molecules [21]. Oxidative stress is also central as an orchestrator or collaborator of inflammation in hypertension-related vascular aging through mediators such as osteoprotegerin and the Sphingosine Kinase 1 gene [22][23]. The increased oxidative stress could further potentiate the pro-inflammatory effects of matrix metalloproteinases (MMPs), through the promotion of a secretory endothelial cell phenotype which aids vascular aging [24] and, consequently, CMVD. Patients with hypertrophic cardiomyopathy and arterial hypertension have structural abnormalities that are responsible for the development of CMVD [14]. The morphological alterations found in each of these disorders are defined by unfavorable remodeling of intramural coronary arterioles, resulting in medial wall thickening (mostly due to smooth muscle hypertrophy and increased collagen deposition) and varying degrees of intimal thickening [25].
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Figure 1. Inflammatory mechanisms of cardiovascular risk factors implicated in coronary microvascular dysfunction. TMAO: trimethylamine N-oxide; NO: nitric oxide.

2.3. Diabetes

In individuals with diabetes mellitus (DM), CMVD is often the prodrome of overt CAD and is a strong predictor of complications and mortality [26][27][28]. Inflammation in DM, induced by oxidative stress and the dysfunctional endothelium, plays a key role in the development of CMVD through the augmented expression of adhesion molecules and inflammatory cytokines as well as the mobilization of vascular smooth muscle cells [29][30]. Vascular adhesion protein-1 (VAP-1), another molecule involved in the pathophysiology of DM, is also overexpressed by damaged endothelial cells, affecting leukocyte recruitment and advanced glycation end products (AGE) generation, thus promoting a pro-inflammatory state [31][32][33]. Chemokines such as CC-chemokine ligand 2–3 and CXC-chemokine ligand 8 have also been found to be involved in leukocyte mobilization and macrophage recruitment, resulting in an augmented inflammatory response in the setting of DM [34]. TNF-α values correlated with the levels of glucose and cystatin C, confirming that diabetes plays an orchestrating role in the progress of CMVD [35]. Coronary microvascular dysfunction has an independent relationship with cardiac or all-cause mortality in people with and without diabetes, allowing for incremental risk classification. Patients with diabetes and impaired CFR have by far more increased risk for cardiac events than those with normal CFR [36]. Importantly, studies have stressed the importance of strict glycemic control in maintaining vascular integrity [30][31], a finding that could be partly justified by attenuation of the above mentioned pro-inflammatory, DM-induced effects via optimal management [37][38].

2.4. Obesity

Weight status constitutes a significant role in the progression of atherosclerotic disease [39]. Obesity is characterized by excessive expansion of visceral white adipose tissue mass, also known as adiposopathy. Adiposopathy is comprised of adipocyte hypertrophy, decreased adipose tissue blood flow, altered oxygen levels within the tissue, a state of chronic low-grade inflammation and blunted lipid metabolism [40][41][42]. The latter includes impaired capacity for storing the surplus of dietary lipids, resulting in deposition of ectopic fat accumulating in body locations where it is not physiologically stored, such as the liver and muscle, and a shift to visceral adipose tissue (fat storage in the intraperitoneal and retroperitoneal spaces), contributing to increased circulating free fatty acids, oxidative stress, systemic inflammation, adipokine dysregulation and insulin resistance [40][41][42][43][44][45]. However, epicardial adipose tissue has several unique properties that distinguish it from other depots of visceral fat due to the common microcirculation of epicardial tissue and the underlying myocardium [46]. The accumulation of epicardial fat is closely associated with an impaired myocardial microcirculation, cardiac diastolic filling abnormalities, increased vascular stiffness, and left atrial dilatation in obese people [47][48]. More specifically, high levels of TNF-α induce the secretion of adhesion and chemoattractant molecules such as vascular cell adhesion molecule-1, intercellular adhesion molecule-1, and monocyte chemoattractant protein-1 while reducing nitric oxide availability. Resistin hormone stimulates the proliferation of smooth muscle cells and the over-secretion of endotelin-1, leading to endothelial dysfunction [49]. Obesity-related reductions in myocardial blood flow due to CMVD, combined with increased cardiac metabolic demand due to increases in ventricular mass, volume expansion, higher filling pressures, and greater cardiac output, may create a perfect background for the occurrence of myocardial oxygen supply–demand mismatch [36]. Finally, an unfavorable correlation was observed between CFR and increased LDL cholesterol where treatment with pioglitazone and lipid-lowering therapy seemed to improve CFR [50].

2.5. Gut Microbiota

This term describes the various commensal microbial species in the gastrointestinal tract [51]. During the last decade, several studies reported the potential association between gut microbiota and atherosclerosis [51][52]. Choline, betaine and L-carnitine are metabolized to trimethylamine (TMA) which is generated to trimethylamine N-oxide (TMAO), a gut microbe-dependent metabolite [51][52]. Studies showed that increased TMAO level induced the activation of NF-kappa B (NF-κB) pathway and increased the expression of pro-inflammatory genes including inflammatory cytokines, adhesion molecules and chemokines [53]. Oxidative stress and NOD-like receptor protein 3 (NLRP3) inflammasome activation could also be triggered by TMAO and inflammatory cytokines such as IL-18 and IL-1β released. As such, diet has an important role in affecting the concentration of TMAO levels and the progression of atherosclerosis [54][55]. Latest studies showed that the use of broad-spectrum antibiotics for 3 to 4 weeks suppressed TMAO levels, ameliorating age-related oxidative stress and arterial dysfunction in mice [56]. The ability of CAD patients’ microbiota to generate ‘secondary’ bile acids enhanced the variety of the bile acid pool in both feces and serum. Under a high fat diet, this mechanism impeded hepatic bile acid synthesis and resulted in higher blood cholesterol levels. The CAD microbiota enhanced circulatory lipopolysaccharides levels as well as pro-inflammatory cytokine expression, while activating intestinal and systemic T help responses and decreasing Treg cell dispersion [57]. Finally, the use of probiotics, synbiotics, and probiotic functional products in a study of 90 obese patients with CAD proved beneficial, controlling plasma TMAO and HDL-C levels [58]. Further studies are needed to evaluate the efficacy of inhibiting various steps of TMAO production for the management atherosclerotic disease.

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