Loss of Regulatory Immune Function in Coronary Artery Disease Patients from the Indian Population

Association Between Coronary Artery Disease and Herpes Zoster: A Cohort Study in Taiwan

Background

Coronary artery disease (CAD) and herpes zoster represent significant health burdens, and their potential interrelationships remain understudied. This cohort study aimed to address the existing knowledge gap by systematically exploring whether people with CAD are at increased risk for developing herpes zoster.

Methods

Using the 2006-2015 claims data of the National Health Insurance Program in Taiwan, we identified participants aged ≥20 years with a new diagnosis of CAD as the CAD group. We selected sex- and age-matched participants without CAD as the non-CAD group. The incidence rate of herpes zoster at the end of follow-up was calculated. A multivariable Cox proportional hazards regression model was used to measure the hazard ratio and 95% CI for herpes zoster associated with covariables.

Results

The overall incidence rate of herpes zoster was 1.14-fold greater in the CAD group as compared with the non-CAD group (6.52 vs 5.74 per 1000 person-years; 95% CI, 1.08-1.20). After controlling for covariables, the adjusted hazard ratio of herpes zoster was 1.21 (95% CI, 1.14-1.27) for the CAD group as compared with the non-CAD group.

Conclusions

This cohort study provides valuable insights into the potential association between CAD and the risk of developing herpes zoster. The findings may have implications for preventive strategies of herpes zoster in people with CAD. Further research and collaboration with diverse groups will be critical to validate and extend our findings.

The interplay between T lymphocytes and macrophages in myocardial ischemia/reperfusion injury

Acute myocardial infarction is one of the most important causes of death in the world, causing a huge health and economic burden to the world. It is still a ticklish problem how to effectively prevent reperfusion injury while recovering the blood flow of ischemic myocardium. During the process of myocardial ischemia/reperfusion injury (MI/RI), the modulation of immune cells plays an important role. Monocyte/macrophage, neutrophils and endothelial cells initiate the inflammatory response and induce the release of various inflammatory cytokines, resulting in increased vascular permeability, tissue edema and damage. Meanwhile, T cells were recruited to impaired myocardium and release pro-inflammatory and anti-inflammatory cytokines. T cells and macrophages play important roles in keeping cardiac homeostasis and orchestrate tissue repair. T cells differentiation and macrophages polarization precisely regulates the tissue microenvironment in MI/RI, and shows cross action, but the mechanism is unclear. To identify potential intervention targets and propose ideas for treatment and prevention of MI/RI, this review explores the crosstalk between T lymphocytes and macrophages in MI/RI.

Dynamic changes of monocytes subsets predict major adverse cardiovascular events and left ventricular function after STEMI

We explored how dynamic changes in monocyte subset counts (as opposed to static values to specific time points), and their phagocytic and NFκB activity relate to major adverse cardiovascular events (MACE) and left ventricular ejection fraction (LVEF) in patients with ST-elevation myocardial infarction (STEMI). Changes in counts, phagocytic activity and intracellular levels of inhibitory κB kinase β (IKKβ) (a marker of NFκB activity) of monocyte subsets (CD14⁺⁺CD16^-CCR2⁺ [Mon1], CD14⁺⁺CD16⁺CCR2⁺ [Mon2] and CD14⁺CD16⁺⁺CCR2^- [Mon3]) were measured by flow cytometry in patients with STEMI at baseline, and again after one week, two weeks, and one month. LVEF was measured by echocardiography at baseline and six months after STEMI. Baseline data included 245 patients (mean ± SD age 60 ± 12 years; 22% female), who were followed for a median of 46 (19-61) months. Multivariate Cox regression demonstrated that more prominent dynamic reduction in Mon2 by week 1 (n = 37) was independently associated with fewer MACE (HR 0.06, 95% CI 0.01-0.55, p = 0.01). Also, less prominent reduction in Mon2 at month 1 (n = 24) was independently predictive of 6-month LVEF. None of the other dynamic changes in monocyte subsets were associated with changes in survival from MACE. Neither phagocytic activity nor IKKβ were associated with survival for each monocyte subset. We showed how distinct pattern of dynamic changes in Mon2 are related to both MACE risk and recovery of cardiac contractility. Further research is needed to understand the mechanism of the monocyte effect and possibilities of their pharmacological manipulation.

Heat shock protein 60 and cardiovascular diseases: An intricate love-hate story

Cardiovascular diseases (CVDs) are the result of complex pathophysiological processes in the tissues comprising the heart and blood vessels. Inflammation is the main culprit for the development of cardiovascular dysfunction, and it may be traced to cellular stress events including apoptosis, oxidative and shear stress, and cellular and humoral immune responses, all of which impair the system's structure and function. An intracellular chaperone, heat shock protein 60 (HSP60) is an intriguing example of a protein that may both be an ally and a foe for cardiovascular homeostasis; on one hand providing protection against cellular injury, and on the other triggering damaging responses through innate and adaptive immunity. In this review we will discuss the functions of HSP60 and its effects on cells and the immune system regulation, only to later address its implications in the development and progression of CVD. Lastly, we summarize the outcome of various studies targeting HSP60 as a potential therapeutic strategy for cardiovascular and other diseases.