Protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced acute myocardial infarction rat model through the PARP pathway

  • Authors:
    • Guowei Jia
    • Ming Zao
    • Xiaoyu Liu
  • View Affiliations

  • Published online on: June 6, 2017     https://doi.org/10.3892/mmr.2017.6695
  • Pages: 1596-1602
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Abstract

The present study investigated the protective effect of diethylcarbamazine in inhibiting nuclear factor (NF)-κB activation in isoproterenol‑induced acute myocardial infarction (AMI) rats through the poly ADP ribose polymerase (PARP) pathway. Male albino Wistar rats were injected subcutaneously with isoproterenol (100 mg/kg/day) for 2 days to induce an AMI model. Diethylcarbamazine (50 mg/kg) was administered by gavage for 12 days prior to the isoproterenol-induced AMI. It was noted that diethylcarbamazine significantly inhibited AMI‑induced casein kinase and lactate dehydrogenase levels, and reduced the AMI‑induced wet heart weight to body weight ratio in AMI rats. Diethylcarbamazine treatment significantly weakened reactive oxygen species production and reduced the levels of tumor necrosis factor (TNF)‑α, interleukin‑6 and NF‑κB/p65 in AMI rats. Western blotting demonstrated that diethylcarbamazine significantly suppressed the AMI‑induced inducible nitric oxide synthase (iNOS), transforming growth factor (TGF)‑β1, cyclooxygenase‑2 (COX‑2) and PARP protein expression in AMI rats. The results demonstrated that the protective effect of diethylcarbamazine inhibited isoproterenol‑induced AMI through the suppression of inflammation, iNOS, TGF‑β1, COX‑2 and the PARP pathway, and revealed the clinical potential of diethylcarbamazine for therapeutic and clinical applications.

Introduction

Myocardial infarction (MI) is a major cause of cardiovascular disease, mortality and disability (1). In China, millions die of acute MI (AMI), which is regarded as a major threat to human health (2). With the extensive employment of thrombolysis and cardiac intervention therapy, in addition to the rapid advancements in drug therapy for treating AMI, myocardium damage in patients with AMI has been greatly ameliorated and the prognosis markedly improved (3). However, there remain patients who cannot be aided with timely revascularization and so suffer irreversible death of the myocardium and ventricular reconstruction (4).

Ventricular reconstruction refers to the changes in the morphological structures of myocardial cells and the intercellular substance caused by the activation of neurohumoral regulatory mechanisms, inflammation and cytokines (5). Cardiac structures and functions become altered according to certain patterns (6). The progressive enlargement and changes in appearance of the ventriculus sinister include changes in ventricular volume, shape, ventricular wall thickness and cardiac structures, which lead to abnormalities of cardiac structure and hemodynamics, progressive dilation of the left ventricle and the decrease of systolic functions (7). Finally, heart failure and mortality may occur (8).

Poly ADP-ribose polymerase (PARP) is widely expressed in eukaryotic cells. Activated PARP is involved in DNA repair (9). Ischemia and hypoxia result in DNA damage and the excessive activation of PARP, can cause the exhaustion of ATP resources (10). As a result of such dysfunction, the cells die. The activities of PARP can be inhibited by 3-aminobenzamide, which can also reduce the consumption of ATP during the process of DNA repair (11). It has been employed for studying multiple tissue ischemic injuries and possesses potential for ischemic myocardium treatment (9).

Previous studies have identified that diethylcarbamazine can be used to inhibit vasoconstriction, reduce systemic arterial pressures and block hypoxic pulmonary vasoconstriction (12). As a diethylcarbamazine, hetrazan has been reported to inhibit the contraction of isolated vascular circles, decrease systemic arterial and pulmonary arterial pressure (13). Trials on animal models have suggested that intravenous injection of diethylcarbamazine can temporarily change cardiac functions and decrease the heart rate (14). The aim of the present study was to investigate the protective effect of diethylcarbamazine against isoproterenol-induced AMI in a rat model and investigate a possible mechanism for its protective effect.

Materials and methods

Animals, induction of AMI and experimental protocol

The present study was performed in accordance with the Guide for the Care and Use of Laboratory Animals of Cangzhou Central Hospital. Male albino Wistar rats (n=24; 230–250 g) were obtained from the Animal Experimental Center of Hebei Medical University (Shijiazhuang, China) and housed in standard polypropylene cages under a 12:12 h light:dark cycle at a constant temperature of 23±2°C and an ambient humidity of 55±5%. Isoproterenol (Sigma-Aldrich; Merck KGaA, Darmstadt, Germany) was injected subcutaneously to rats (100 mg/kg/day) to create the AMI model. All the rats were randomly divided into four groups consisting of 6 rats each: Sham, diethylcarbamazine, AMI model and AMI model + diethylcarbamazine group. In the sham and AMI model groups, normal rats and isoproterenol-induced AMI rats were injected with distilled water. In the diethylcarbamazine and the AMI model + diethylcarbamazine groups, diethylcarbamazine (50 mg/kg/day) was administered to the rats by gavage for 12 days, prior to induction of the AMI with isoproterenol.

Tissue weights and histopathological examination

The animals were euthanized with 35 mg/kg pentobarbital 2 days after induction of the AMI model, and the hearts were removed and weighed. The wet heart weight to body weight ratio was calculated to assess the degree of myocardial weight gain. Hearts samples were fixed in 10% buffered formalin prior to being embedded in paraffin wax and sectioned at 5 µm thickness. Sections were stained with hematoxylin and eosin.

Measurement of casein kinase (CK), lactate dehydrogenase (LDH), reactive oxygen species (ROS), inflammation response and nuclear factor (NF)-κB activation

Serum samples were extracted from the vena cava following the isoproterenol-induced AMI model. Supernatant was collected at 5,000 × g for 10 min at 4°C. The CK (A032, Nanjing Jiancheng Bioengineering Institute, Nanjing, China), LDH (E-EL-R0338c), tumor necrosis factor (TNF)-α (−EL-R0019c), interleukin (IL) −6 (E-EL-R0015c, Elabscience) and NF-κB/p65 (E-EL-R0674c) (all from Elabscience Biotechnology, Co., Ltd., Bethesda, MD, USA) activities were measured using commercial ELISA kits according to the manufacturer's protocols.

Western blot analysis

Hearts were removed and then homogenized by a Wheaton overhead stirrer. Homogenates were centrifuged at 3,000 × g for 10 min and the supernatant collected. Protein concentrations were determined with a bicinchoninic acid protein assay kit (Thermo Scientific Inc., Waltham, MA, USA). The proteins (40 mg) were separated with 10% sodium dodecyl sulfate-polyacrylamide by gel electrophoresis and electrophoretically transferred onto nitrocellulose membranes (Bio-Rad Laboratories, Inc., Hercules, CA, USA). Membranes were blocked with 5% nonfat milk in TBS-0.1% Tween-20 (TBS-T) for 1 h and were incubated at room temperature, for 2 h, with anti-COX-2 (1:2,000), anti-transforming growth factor (TGF)-β1 (1:4,000), anti-inducible nitric oxide synthase (iNOS; 1:2,000), anti-PARP (1:3,000) and anti-β-actin (1:4,000) (all from Abcam, Cambridge, CA, USA). Following washing in TBS-T, the membranes were incubated with horseradish peroxidase-conjugated anti-rabbit secondary antibody (1:5,000; Abcam, CA, USA) for 1 h and 30 min at room temperature and visualized with an enhanced chemiluminescence reagent (Santa Cruz Biotechnology, Inc., Dallas, TX, USA). Intensity of each band was determined using the ImageJ program version 1.38 (National Institutes of Health, Bethesda, MD, USA).

Statistical analyses

Data are expressed as the mean ± standard deviation using SPSS 17.0 (SPSS, Inc., Chicago, IL, USA). One-way analysis of variance was used to assess differences between the groups, followed by Tukey's test. P<0.05 was considered to indicate a statistically significant difference.

Results

Protective effect of diethylcarbamazine inhibits cardiac function in isoproterenol-induced AMI rats

The protective effect of diethylcarbamazine on the cardiac function of isoproterenol-induced AMI rats was evaluated (Fig. 1). Following diethylcarbamazine treatment (50 mg/kg) for 12 days, no significant inter-group difference in cardiac functions was observed between the control and the diethylcarbamazine-alone groups (P>0.05). The levels of CK and LDH in the isoproterenol-induced AMI model group were higher compared with those of the control group (P<0.01). However, treatment with diethylcarbamazine significantly inhibited the AMI-induced CK and LDH levels in AMI rats (P<0.01).

Protective effect of diethylcarbamazine reduces the wet heart weight to body weight ratio in AMI rats

Following diethylcarbamazine treatment in AMI rats, the wet heart weight to body weight ratio of the control group was similar to the AMI model group. Compared with the control group, the wet heart weight to body weight ratio of the AMI model group was significantly increased (P<0.01). Treatment with diethylcarbamazine significantly reduced the AMI-induced wet heart weight to body weight ratio in AMI rats (P<0.01; Fig. 2).

Protective effect of diethylcarbamazine inhibits ROS production in AMI rats

To evaluate the protective effect of diethylcarbamazine on oxidative stress in AMI rats, ROS production was measured to estimate the protective effect of diethylcarbamazine on AMI (Fig. 3). No significant difference was observed between the control and diethylcarbamazine-alone groups (P>0.05). In the AMI model group, ROS production was significantly enhanced compared with the control group (P<0.01). Diethylcarbamazine treatment significantly weakened ROS production in AMI rats (P<0.01).

Protective effect of diethylcarbamazine inhibits inflammation response in isoproterenol-induced AMI rats

TNF-α, IL-6 and NF-κB/p65 activity was detected using ELISA kits to evaluate the protective effect of diethylcarbamazine on AMI (Fig. 4). No significant difference was observed in the level of TNF-α, IL-6 and NF-κB/p65 between the control and the diethylcarbamazine-alone groups (P>0.05). Compared with control group, the level of TNF-α, IL-6 and NF-κB/p65 were significantly increased in the AMI model group (P<0.01). However, pretreatment with diethylcarbamazine significantly reduced the AMI-induced TNF-α, IL-6 and NF-κB/p65 levels (P<0.01).

Protective effect of diethylcarbamazine inhibits COX-2 expression in AMI rats

No significant inter-group difference was identified between the control and the diethylcarbamazine-alone groups for COX-2 expression (P>0.05). COX-2 expression in the AMI model group was higher compared with the control group (P<0.01; Fig. 5). Compared with the AMI model group, pretreatment with diethylcarbamazine noticeably reduced the AMI-induced COX-2 protein expression (P<0.01).

Protective effect of diethylcarbamazine reduces TGF-β1 expression in AMI rats

No significant changes were observed in protein expression of TGF-β1 between the control group and the diethylcarbamazine-alone group. The TGF-β1 protein expression was notably induced by AMI, compared with the control group (P<0.01). Diethylcarbamazine significantly suppressed the AMI-induced TGF-β1 protein expression (P<0.01; Fig. 6).

Protective effect of diethylcarbamazine reduces iNOS expression in AMI rats

To explore the protective effect of diethylcarbamazine on iNOS expression in AMI rats, iNOS protein expression was measured using western blotting (Fig. 7). No significant difference was observed between the control and the diethylcarbamazine-alone groups. Compared with the control group, iNOS protein expression was significantly increased in AMI rats (P<0.01). The activation of iNOS protein expression was significantly attenuated by diethylcarbamazine in AMI rats (P<0.01).

Protective effect of diethylcarbamazine inhibits PARP expression in AMI rats

To further explore the protective effect of diethylcarbamazine on PARP expression in AMI rats, PARP protein expression levels were measured using western blotting (Fig. 8). No significant difference was observed between the control and diethylcarbamazine-alone groups for PARP expression (P>0.05). However, AMI significantly increased PARP expression compared with the control group (P<0.01). Diethylcarbamazine significantly suppressed the AMI-induced PARP protein expression in AMI rats, compared with that of AMI model group (P<0.01).

Discussion

As a common cardiovascular disease, the morbidity of AMI is a leading health problem. With advances in medical technologies the mortality rates of AMI have decreased to a certain extent (7). However, survivors still experience complications, including recurrent AMI or refractory cardiac insufficiency (15). Data have demonstrated that mortality rates of AMI and cardiac failure are ~80% (15). Consequently, assessment of the myocardial systolic function of the whole and local left ventricle can accurately confirm the functional status of the ischemic myocardium; leading to an early diagnose of ischemic heart disease and useful prognosis (16). The present study investigated whether treatment with diethylcarbamazine significantly inhibited AMI-induced CK and LDH levels, and reduced the AMI-induced wet heart weight to body weight ratio in AMI rats.

An inflammatory response can be directly triggered by ROS produced by ischemic tissues (17). When the formation of ROS is much higher than the load of the endogenous antioxidant defense system, cellular damage, mediated by free radicals, occurs (18). ROS can trigger cascade reactions of inflammatory cytokines and chemotactic factors through activation of the inflammasome of myocardial cells (19). The formation of inflammasome can promote the production and activation of IL-1 which is a classic proinflammatory factor promoting the inflammatory mediator expression in infarcted myocardium (20). The present study identified that diethylcarbamazine treatment significantly weakened ROS production in AMI rats.

Inflammatory reactions have an important role in ventricular remodeling following AMI. Ventricular remodeling includes the inflammatory cascade triggered by myocyte necrosis at the infarcted zone, recruitment of inflammatory cells at the infarcted zone and upregulation of proinflammatory cytokines (21). Later, necrotic myocardial cells are replaced by collagenous fibers, resulting in the formation of glial scars, cardiomyocyte hypertrophy at the non-infarcted areas, degradation of myocardial matrix and reconstruction of matrix (22). This process involves the inflammatory responses and consequently the repair process following AMI is a complex development with related pathways mediated by inflammation as an important link (22). Continuous inflammatory responses following AMI triggers myocardial damage, fibrosis and the expansion of AMI, finally resulting in the deterioration of the cardiac function (22). A significant inhibition of TNF-α, IL-6 and NF-κB/p65 levels was observed following treatment with diethylcarbamazine in AMI rats.

During the inflammatory response process, iNOS is activated and excessive nitric oxide (NO) is produced, an important factor in the death of transplanted cells (23). As an important signal transduction molecule, NO serves an essential role in physiological processes and has important effects on the progression of a number of diseases (24). In the present study, diethylcarbamazine significantly increased iNOS protein expression in AMI rats. da Silva et al (14) indicated that diethylcarbamazine prevented alcohol-induced liver injury via NF-κB, COX-2 and iNOS in C57BL/6 mice.

As major effector cells of myocardial fibrosis, myofibroblasts can proliferate, synthesize and secrete a number of bioactivators, resulting in the increase of collagen deposition in mesenchyme, disproportionality and disordered arrangement, which are the pathological basis of AMI. The functions of TGF-β1 in this process have been investigated (25). TGF-β1 has strong chemotaxis to fibroblasts, which stimulates it to secrete a considerable amount of extracellular matrix (12). Studies have suggested that the expression of collagen I and III would increase in cardiac muscle tissues with TGF-β1 (25,26). The present study demonstrated that diethylcarbamazine significantly suppressed the AMI-induced expression of TGF-β1 protein. Rocha et al (27) confirmed that diethylcarbamazine reduces chronic inflammation and fibrosis in liver injury by decreasing IL-1β, COX-2, NF-κB, interferon-γ and TGF-β expression.

When stimulated by hypoxia-ischemia and pro-inflammatory factors, high levels of arachidonate is released and prostaglandin (PG) H2 synthesis is catalyzed by COX-1 and COX-2. Although their catalyzation principles are similar, the catalytic action rate of COX-2 on arachidonic acid is four times that of COX-1 (28). Under the actions of modifying enzymes, PGH2 can be transformed into other PGs, including PGE2, PGI2, PGD2 and thromboxane A2. PGs exert their systemic effects via autocrine and paracrine mechanisms with signal switching conducted in the surrounding environment (29). The upregulation of COXs in myocardial cells can increase the contents of PGs in cardiac muscle tissues and can therefore has an important regulatory role in myocardial cells. A previous study indicated that COX-2 has a harmful role in ischemic myocardium and the inhibition of COX-2 can effectively protect the myocardium (30). In the present study, diethylcarbamazine significantly reduced the AMI-induced COX-2 protein expression in rats. Ribeiro et al (31) demonstrated that diethylcarbamazine attenuates carrageenan-induced lung injury in rats via COX-2 and iNOS expression.

A key factor for necrocytosis or apoptosis is the level of ATP. If there is a store of ATP, injured cells tend to undergo apoptosis (32). If energy is depleted, necrocytosis occurs. As a selective inhibitor of PARP, 3-aminobenzamide can reduce the consumption of ATP in injured cells and transform necrotic cells to normal cells. A PARP inhibitor can significantly reduce the death of ischemic neurons and protect against injury caused by reperfusion following focal cerebral ischemia (9). The increase of PARP activation increases cell death. When ischemic damage is mild and DNA injuries are rather limited, DNA repair takes the lead and cells tolerate ischemia and survive. Following severe ischemic damage, multiple DNA damage and DNA repair mechanisms are activated; however, PARP inhibition is initiated by apoptosis signaling, which can be harmful or beneficial (11). Therefore, using an optimal dose of PARP inhibitors has a significant value in overcoming these damaged mechanisms. The present study identified that diethylcarbamazine significantly suppressed AMI-induced PARP protein expression in rats. Santos et al (13) suggested that diethylcarbamazine inhibits NF-κB activation via PARP in mice with acute carrageenan-induced lung injury.

In conclusion, to the best of our knowledge, the present study is the first to demonstrate that the protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced AMI rats and exerts a protective effect on AMI through the suppression of inflammation, iNOS, TGF-β1, COX-2 and PARP, revealing the clinical potential of diethylcarbamazine for therapeutic and clinical applications.

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Spandidos Publications style
Jia G, Zao M and Liu X: Protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced acute myocardial infarction rat model through the PARP pathway. Mol Med Rep 16: 1596-1602, 2017
APA
Jia, G., Zao, M., & Liu, X. (2017). Protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced acute myocardial infarction rat model through the PARP pathway. Molecular Medicine Reports, 16, 1596-1602. https://doi.org/10.3892/mmr.2017.6695
MLA
Jia, G., Zao, M., Liu, X."Protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced acute myocardial infarction rat model through the PARP pathway". Molecular Medicine Reports 16.2 (2017): 1596-1602.
Chicago
Jia, G., Zao, M., Liu, X."Protective effect of diethylcarbamazine inhibits NF-κB activation in isoproterenol-induced acute myocardial infarction rat model through the PARP pathway". Molecular Medicine Reports 16, no. 2 (2017): 1596-1602. https://doi.org/10.3892/mmr.2017.6695