Heart failure due to a variety of causes is accompanied by an upregulation of cytokines, such as tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta) and interleukin-6 (IL-6).
Interleukin 6 (IL-6), which is elevated in patients with congestive heart failure and acts as both a chronic marker of inflammation and an acute-phase reactant, is associated with myocardial damage.
IL-6 concentration in the plasma of <i>TNFα</i> A-allele carriers at months 1 and 12 after CABG was higher in the HF group compared to the non-HF group (1 month after CABG: 5.3 ± 3.4 vs. 3.1 ± 2.9, p<0.05; 12 months after CABG: 4.2 ± 3,9 vs. 1.4 ± 1.2, p<0.01, respectively).
A total of 559 Danish subjects with severe chronic HF enrolled in the previously reported Echocardiography and Heart Outcome Study were genotyped for three SNPs in IL6, nine in the IL-6 receptor gene (IL6R), and two in the IL-6 signal transducer gene (IL6ST).
Accordingly, we have examined IL-6-related cytokines in chronic CHF in humans by analysing gene and protein expression in myocardium derived from patients with end-stage heart failure and donor hearts.
After adjusting for eGFR, albuminuria, and other traditional cardiovascular risk factors, anemia (1.37, 95% CI 1.09, 1.72, <i>P</i>=0.006), insulin resistance (1.16, 95% CI 1.04, 1.28, <i>P</i>=0.006), hemoglobin A1c (1.27, 95% CI 1.14, 1.41, <i>P</i><0.001), interleukin-6 (1.15, 95% CI 1.05, 1.25, <i>P</i>=0.002), and tumor necrosis factor-α (1.10, 95% CI 1.00, 1.21, <i>P</i>=0.05) were all significantly and directly associated with incidence of heart failure.
After further adjustment for biomarkers (high-sensitivity C-reactive protein, lipoprotein-associated phospholipase A<sub>2</sub> activity, high-sensitivity troponin I, and B-type natriuretic peptide), IL-6 remained significantly associated with the risk of major adverse cardiovascular events (adj HR Q4:Q1 1.43, 95% CI 1.09-1.88) and cardiovascular death or heart failure (adj HR 1.79, 95% CI 1.22-2.63).
BACKGROUND This study investigated the expression of the BCL2 and BAX mRNA, inflammatory cytokines, interleukin-1ß (IL-1ß), IL-6, and tumor necrosis factor-alpha (TNF-alpha), and cardiac function in patients with chronic heart failure (CHF).
Both adrenergic stimulation and high levels of interleukin-6 (IL-6) indicate an unfavorable outcome in patients with myocardial infarction or heart failure.
Cardiotrophin-1 (CT-1), a stress-induced cytokine that belongs to the interleukin 6 family, is released by cells in response to potentially harmful stresses and plays a pivotal role in congestive heart failure, hypertension and arterial stiffness.
Circulating plasma concentrations of pro-inflammatory cytokines (e.g., tumor necrosis factor [TNF]-alpha and interleukin [IL]-6) are elevated in patients with heart failure and these cytokines have been shown to down-regulate CYP enzyme activity.
Decreased anabolism because of alterations in the insulin-like growth factor 1 (IGF-1)/growth hormone (GH) axis and increased catabolism induced by proinflammatory cytokines like tumor necrosis factor α (TNF-α) and interleukin 6 (IL-6) have been reported to contribute to muscle wasting in chronic heart failure (CHF).
In addition, the levels of IL-6, TNF-α and IL-1β decreased to 154.41 ± 7.72 pg/mg protein, 110.02 ± 6.96 pg/mg protein and 39.39 ± 5.27 pg/mg protein, respectively; the relative activity of p38 MAPK decreased to 2.60 ± 0.40 in CHF + SOJ group.
In conclusion, RORα protects against ANG II-mediated pathological hypertrophy and heart failure by suppressing the IL-6-STAT3 pathway and enhancing mitochondrial function.
In contrast, it has been reported that elevated serum levels of IL-6 cytokines and gp130 proteins are strong prognostic markers for morbidity and mortality in patients with heart failure or after myocardial infarction.
In the CRS1 group, the mRNA expression of IL-6, IL-18 and NGAL resulted significantly higher in TECs incubated with CRS1 plasma compared with those incubated with plasma from HF and CTR (p < 0.01).
In this context, CHF is associated with overexpression of pro-inflammatory cytokines, such as tumor necrosis factor-α, interleukin (IL)-1, and IL-6, which are activated in response to environmental injury.
In women with signs and symptoms of ischemia, non-obstructive CAD and preserved EF, elevated IL-6 predicted HF hospitalization and all-cause mortality, while SAA level was only associated with all-cause mortality.
Increasing evidence suggests that development of heart failure involves activation of stress-response inflammatory cytokines, including tumor necrosis factor-alpha and interleukin-6.