Wogonin reduces cardiomyocyte apoptosis from mitochondrial release of cytochrome c to improve doxorubicin‑induced cardiotoxicity
- Authors:
- Published online on: January 7, 2022 https://doi.org/10.3892/etm.2022.11128
- Article Number: 205
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Copyright: © Wei et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Doxorubicin (DOX) is a double-edged sword as a classic anthracycline anti-tumor drug (1). On one hand, it is favored by doctors and patients because of its powerful anti-tumor effects (2). On the other hand, its dose accumulation and time-dependent cardiotoxicity concerns doctors and patients (3). The mechanism of cardiac toxicity caused by DOX is mostly related to the increase of oxidative stress, damage to mitochondrial function and finally apoptosis (4). Cytochrome c serves a key role in mitochondrial injury (5). The increased permeability of damaged mitochondrial membrane leads to the leakage of cytochrome c from mitochondria and finally leads to cardiomyocyte apoptosis (6). Although some drugs have been used in the prevention and treatment of DOX-induced cardiotoxicity for a number of years, the overall effect remains poor (7,8).
At present, dexrazoxane is the only anthracycline anti-tumor drug cardioprotective agent approved by the FDA (USA), but it is rarely used clinically in China due to its high price and lack of popularity (9,10). Therefore, it is urgent to find a more effective protective drug to protect the heart from the damage of anthracycline anti-tumor drugs.
Wogonin (WG; 5,7-dihydroxy-8-methoxyflavone), an important flavonoid extracted from Scutellaria baicalensis root, has been proved to possess anti-inflammatory, antioxidant, anti-allergic and anti-apoptotic properties (11,12). A number of studies have shown that it protects the heart from diabetes, obesity and ischemia-reperfusion injury (13-15). However, whether WG can protect heart from DOX damage remains to be elucidated.
In the present study, DOX was used to induce cardiac injury and WG was administered by gavage to observe its protective effect. The aim of the present study was to investigate the anti-apoptotic effect of WG on DOX-induced cardiotoxicity and its key mechanism.
Materials and methods
Materials
Wogonin (WG) and Doxorubicin (DOX), purity ≥98%, were purchased from MilliporeSigma. Malondialdehyde (MDA; cat. no. A003-1-1) and superoxide dismutase (SOD; cat. no. A001-1-1) test kits were obtained from Nanjing Jiancheng Bioengineering Institute. Brain natriuretic peptide (BNP; cat. no. 1608B), creatine kinase MB (CK-MB; cat. no. 6930B) and cardiac troponin T (cTnT; cat. no. 7278A) test kits were all purchased from Shanghai Meixuan Biotechnology Co., Ltd. ROS detection kit and CCK-8 cell viability and toxicity detection kit were purchased from Biosharp Life Sciences. The antibody of cytochrome c (cat. no. 11940), COX Ⅳ (cat. no. 4850), pro/cleaved-caspase-3 (cat. no. 14220S/cat. no. 9664S) and cleaved-caspase-9 (cat. no. 9507) were obtained from Cell Signaling Technology, Inc. All chemicals and reagents were analytical grade.
Animal model
The present study was approved by the Animal Ethics Committee of Hubei Medical College (approval no. 42000900000093). A total of 40 Male SD rats (weight, 150-180 g; age, 5-6 weeks) were obtained from the Hubei Medical College experimental animal center. Rats were randomly distributed equally into four groups: CON group (normal, n=10), WG group (WG gavage, 100 mg kg-1, n=10), DOX group (3 mg kg-1 DOX was injected via caudal vein once a week, n=10) and WG+THP group (3 mg kg-1 THP was injected via caudal vein once a week with WG gavage, 100 mg kg-1, n=10). The rats were kept at a standard room temperature of 22±3˚C, 45±10% humidity and 12-h light/dark cycle. The animals were supplied with standard laboratory food and ad libitum access to tap water before experiments. The dosages of DOX and WG in animal experiments referred to relevant studies (16-18).
Electrocardiography and echocardiography
Following the experiments, rats were anesthetized by ketamine (55 mg/kg) plus xylazine (15 mg/kg) (19). Following anesthesia, Doppler echocardiography of rats were measured by a Vivid E95 ultrasonic diagnostic instrument (General Electric Company) and ejection fraction (EF) and fractional shortening (FS) values in echocardiography were measured. electrocardiograms (ECG) of rats were recorded by BL-420E biological function measurement system (Chengdu Taimeng Technology Co., Ltd.) and the R-wave, T-wave and QT interval in ECG were measured.
Sample collection and processing
Under anesthesia, the rats were sacrificed by cervical dislocation. Blood samples were collected and centrifuged at 3,000 x g for 30 min at 4˚C immediately. The supernatant was collected and the levels of BNP, CK-MB, cTnT, SOD and MDA were measured immediately according to the kit instructions. Part of the left ventricular tissue was fixed in 10 times volume of 4% paraformaldehyde solution for 72 h at 4˚C. Then, following dehydration and infiltration, it was embedded in paraffin and sectioned at 4-5 µm thickness and finally stained according to the instructions of H&E and TUNEL staining kit (Beyotime Institute of Biotechnology) for 1 h at room temperature. The remaining heart tissue was cryopreserved at -80˚C.
Cell culture and treatment
The ventricular parts of neonatal SD rats were quickly separated under sterile conditions, cleaned and then cut into fragments with a diameter of less than 1 mm, digested by trypsin + type II collagenase, then filtered, centrifuged at 1,000 x g for 5 min at room temperature, suspended and seeded (~5x106 cells/well). Finally, primary rat cardiomyocytes were isolated by the differential adhesion method (5). The primary cardiomyocytes were divided into four groups: Normal group (CON), WG group (WG, 10 µM, 12 h), DOX group (DOX, 5 µM, 12 h), DOX and WG co-culture group (DOX, 5 µM + WG 10 µM, 12 h).
Western blotting
The mitochondria and cytoplasm of rat ventricular tissue and primary rat cardiomyocytes were separated according to the instructions of tissue or cell mitochondrial extraction kit (Beyotime Institute of Biotechnology). A BCA kit was used to determine the protein concentration thereafter. Then, ~30 µg heart tissue or cell lysate was loaded per lane onto 12% sodium dodecyl sulfate-polyacrylamide gel electrophoresis, after which proteins were transferred to an FL membrane (MilliporeSigma) at 4˚C for 2 h. After blocking with 5% blocking protein powder (non-fat milk powder; Beyotime Institute of Biotechnology) at room temperature for 2 h, the following primary antibodies were added and incubated overnight at 4˚C: Cyt C (1:1,000), pro/cleaved caspase-3 (cat. no. 14220S/cat. no. 9664S; 1:1,000), cleaved caspase-9 (cat. no. 9507; 1:1,000), COX IV (cat. no. 4850; 1:1,000) and GAPDH (cat. no. 10494-1-AP; 1:5,000). Subsequently, HRP-conjugated goat anti-rabbit IgG (H+L) secondary antibodies (1:10,000; Thermo Fisher Scientific, Inc.; cat. no. #31460) were added and incubated at room temperature for 1.5 h. The results of western blotting were analyzed using BeyoECL Plus (Beyotime Institute of Biotechnology) and Image Lab software (version 5.2.1; Bio-Rad Laboratories, Inc.). The specific protein expression levels were normalized to GAPDH or COX IV.
Reverse transcription-quantitative (RT-q) PCR
TRIzol® (Thermo Fisher Scientific, Inc.) was used to extract total RNA from frozen, crushed rat hearts and 5x106 cultured primary cardiac myocytes (n=3) in accordance with the manufacturers protocol, and quantified at 260 nm using a NanoPhotometer (cat. no. P300; Implen GmbH). The total RNA was transcribed in two steps by super script first strand synthesis system used in accordance with the manufacturers protocol (cat. no. K1073; Apexbio Technology LLC). The PCR products were quantified by SYBR Green PCR Master Mix (Applied Biosystems; Thermo Fisher Scientific, Inc.) and the results were standardized with β-Actin Gene expression. The thermocycling conditions were as follows: Initial denaturation at 95˚C for 30 sec, followed by 40 cycles of denaturation at 94˚C for 5 sec, annealing at 58˚C for 30 sec and extension at 70˚C for 5 sec. β-actin served as the internal reference gene and results were analyzed using the 2-ΔΔCq method (20). The primer sequences were: Voltage-dependent anion-selective channel 1 (VDAC-1): Forward ATGTCTTCACCAAGGGCTAT, Reverse TCTGGGTCACTCGGGATT; adenine nucleotide transporter 1 (ANT1): Forward TGGGCGACTGTATCATCAAG, Reverse TCACACTCTGGGCAATCATC; cyclophilin D (Cyp D): Forward TTCCATCTTATGCTCTTCACCG, Reverse GGTTGAAGAAGTCCTTGTCTGC; β-actin: Forward CTCTTCCAGCCTTCCTTCCT, Reverse AGCACTGTGTTGGCGTACAG.
Statistical analysis
Data were presented as mean ± SD. The significance of differences between groups were analyzed statistically using one way analysis of variance (ANOVA), followed by a Tukey's multiple-comparison post hoc test. P<0.05 was considered to indicate a statistically significant difference.
Results
WG improves the abnormalities of echocardiography and ECG in DOX rats
At the end of the experiment, a certain number of succumbed in DOX group and the mortality was ~30% (7 survived and 3 succumbed). There was no mortality the in other groups.
Following DOX administration, echocardiography and ECG changes occurred in rats, suggesting that DOX caused cardiac injury in rats. Echocardiography (Fig. 1A) showed a decrease in EF (Fig. 1C) and FS (Fig. 1D) in rats. However, the changes of EF and FS were reversed following WG treatment. Similar to echocardiography, DOX also caused ECG (Fig. 1B) abnormalities in rats, which were characterized by increased R wave (Fig. 1E) and T wave (Fig. 1F) and prolonged QT interval (Fig. 1G). WG treatment also reversed these changes.
WG improves myocardial injury and increase of oxidative stress in DOX rats
Myocardial injury is often accompanied by the increase of serum myocardial injury markers and myocardial oxidative stress (21). In the DOX rat model, the contents of serum cTnT (Fig. 1H), CK-MB (Fig. 1I) and BNP (Fig. 1J) increased. However, the above myocardial injury markers decreased following WG treatment. Similarly, in myocardial tissue, SOD activity (Fig. 2A), glutathione (GSH) content (Fig. 2C) and CAT content (Fig. 2D) decreased and MDA content (Fig. 2B) increased. WG effectively alleviated the abnormal oxidative stress. These results suggested that WG effectively alleviated the heart injury caused by DOX and the abnormal increase of oxidative stress.
WG improves DOX induced cardiac tissue damage and cardiomyocyte apoptosis in rats
DOX caused the disorder of cardiac tissue arrangement, the increase of cell gap and the abnormality of nucleus in rats. The related changes were alleviated following WG treatment (Fig. 2F). As shown in Fig. 2E, TUNEL staining showed that there was no cardiomyocyte apoptosis in CON and WG group, but there was regional cardiomyocyte apoptosis in DOX injection group. The treatment of WG effectively improved DOX-induced cardiomyocyte apoptosis. The quantitative results were shown in Fig. 2G.
Effect of WG on DOX-induced apoptosis-related signal pathway in rats
Mitochondrial membranes are composed of Cyp D, VDAC1 and ANT1. Abnormal increased permeability cause cytochrome c to leak into cytoplasm from mitochondria and start caspase related apoptosis signal pathway. The mRNA level of the components of mitochondrial membranes was detected by RT-qPCR. The results showed that the mRNA expressions of Cyp D, VDAC1 and ANT1 in DOX model rats were significantly higher than those in the control group (Fig. 3A). As shown in Fig. 3A, the mRNA levels of these genes in the WG group were significantly lower than those in the DOX group, which showed that under the action of WG, there were fewer mitochondrial permeability conversion pores composed of the above components than DOX group, which inhibited the release of cytochrome c from mitochondria to cytoplasm.
By contrast, western blotting was used to detect the changes of mitochondrial membrane permeability related apoptosis signal pathway. The results showed that the expression of mitochondrial cytochrome c protein in DOX rats was significantly lower compared with the control group (Fig. 3B), while the expression of cytoplasmic cytochrome c protein was significantly higher compared with that in the control group (Fig. 3D). This indicated that cytochrome c leaked from mitochondria into the cytoplasm. In addition, the cytoplasmic cleaved-caspase-9/3 of DOX model rats was significantly higher compared with of the control group, while pro-caspase-3 was significantly lower compared with of the control group (Fig. 3D). This suggests that caspase dependent apoptosis was activated. However, compared with DOX group, WG treatment group effectively reversed the above changes (Fig. 3B and D). The semi-quantitative analysis results were shown in Fig. 3C and E.
Effect of WG on DOX-induced apoptosis-related signal pathway in cardiomyocytes
In order to verify whether WG has the same protective effect on DOX induced-cardiomyocyte apoptosis in cells, a DOX cell model we cultured and treated with WG. As with the animal experiments, WG prevented the abnormal increase of mitochondrial membrane permeability caused by DOX, the leakage of cytochrome c from mitochondria into cytoplasm and the activation of caspase dependent apoptosis pathway in DOX cell group.
Specifically, WG effectively inhibited the significant increase of Cyp D, VDAC1 and ANT1 mRNA expression (Fig. 4A), the significant decrease of mitochondrial cytochrome c (Fig. 4B) and cytoplasmic pro-caspase-3 protein expression (Fig. 4D) and the significant increase of cytoplasmic cytochrome c and cleaved-caspase-9/3 (Fig. 4D) protein expression caused by DOX. The semi-quantitative analysis results were shown in Fig. 4C and E.
Discussion
Doxorubicin (DOX) is an anthracycline anti-tumor antibiotic, which has a wide spectrum of anti-tumor effects (2). It is commonly used in the treatment of acute leukemia, breast cancer, malignant lymphoma and bronchial lung cancer (22-24). However, its clinical application is seriously limited due to its dose-dependent and time-dependent cardiotoxicity (3,7,25). The cardiotoxicity of DOX is often manifested as arrhythmia, myocardial conduction disorder, myocarditis, cardiomyopathy and heart failure (26). Traditional wisdom suggests that the safe cumulative dose of DOX is 550 mg/m2 (27). However, there are obvious individual differences in the cardiotoxicity of DOX and there is no absolute safe dose (28). Previous studies have confirmed that cardiomyocyte apoptosis serves a very important role in DOX-induced cardiotoxicity (29,30). DOX leads to a large amount of ROS accumulation and calcium overload in cells and destroys the permeability of mitochondrial membrane (31,32). A large number of pro-apoptotic factors such as cytochrome c enter the cytoplasm from mitochondria, activate the caspase pathway, initiate the endogenous apoptosis pathway and finally lead to cardiomyocyte death (33). Other studies also found that DOX can cause abnormal mitochondrial morphology and structure, lipid deposition and irregular arrangement of myofilaments, accompanied by myofilament breakage and dissolution (4,10). This indicates that mitochondrial function serves an important role in DOX induced heart injury.
WG, also known as 5,7-dihydroxy-8-methoxyflavone, is a flavonoid extracted from the root of Scutellaria baicalensis. It has significant pharmacological effects in a variety of diseases, such as anti-inflammatory, anti-apoptosis, anti-oxidation, cell cycle regulation and anti-cancer and leukemia (13,15). In addition, WG also shows powerful cardioprotective effect in animal models (14,15), but its pharmacological effect in heart injury caused by DOX remains to be elucidated. The present study showed that 100 mg/kg WG improved the changes of echocardiography and ECG induced by DOX and decreased the serum levels of BNP, CK-MB and cTnT (34). Elevated levels of cardiac markers suggested that DOX caused myocardial injury, but WG effectively alleviated the heart injury caused by DOX.
In the present study, it was also observed that the serum SOD, GSH and CAT increased and the serum MDA level decreased in DOX rats following WG treatment, indicating that WG exerts an anti-oxidant effect. Relevant studies have pointed out that WG significantly reduces the myocardial infarction area, serum cardiac markers, lipid peroxidation products (MDA) and inflammatory markers in myocardial infarction rats. Significantly upregulating the expression of Nrf2 and HO-1 protein has also been demonstrated, which has a powerful myocardial protective effect on myocardial injury (11,13,15).
Compared with DOX group, WG decreased the levels of cytosolic cytochrome c and cleaved-caspase-3/9 protein and increased mitochondrial cytochrome c. At the same time, WG also reduced the levels of VDAC1, ANT1 and Cyp D mRNA and the reduction of mitochondrial cytochrome c release at the gene level, thus reducing the occurrence of apoptosis; this is similar to the results of Zhang et al (33) on the cardiotoxicity of another anthracycline in rats. Mitochondrial function and its role in maintaining cellular redox/oxidation balance are the basis of regulating cellular homeostasis (35). ROS is the main by-product of normal mitochondrial metabolism and stable internal environment (36). Under physiological conditions, the balance between ROS generation and clearance is highly controlled (37). DOX causes excessive accumulation of ROS and upregulates oxidation, which may lead to serious mitochondrial damage, cell damage and death and lead to the failure of the whole organ and organism (38,39). Mitochondrial permeability transition pore (mPTP) serves a central role in regulating cell death (40). A number of factors, such as high concentration of ROS, seem to lead to the opening of mPTP (41). The mPTP is hypothesized to be regulated by VDAC in mitochondrial outer membrane, ANT in mitochondrial inner membrane and Cyp D in mitochondrial matrix (40,42). The abnormal increase of mPTP permeability from various reasons leads to apoptosis through mitochondrial mediated pathway (43). In short, DOX significantly increases the level of cytochrome c in cytoplasm and the expression of cleaved-caspase-3/9 protein and decreases the level of cytochrome c in mitochondria. Cytochrome c is not only an important factor for mitochondria to promote apoptosis, but also a key factor for the initiation of apoptosis signal pathway (44,45). Once released, cytochrome c forms a complex with Apaf1 and pre-caspase-9, which activates cleaved-caspase-9/3, resulting in programmed cell death (45,46). The opening of mPTP leads to mitochondrial depolarization and mitochondrial membrane potential dissipation, followed by progressive mitochondrial swelling and the loss of soluble components of respiratory chain, which eventually leads to the rupture of mitochondrial outer membrane and the leakage of proteins from mitochondria to cytoplasm, thus accelerating the occurrence of apoptosis (47,48). The present study showed that WG reversed the opening of mPTP and reduced the release of apoptotic factors cytochrome c into the cytoplasm, so as to prevent apoptosis. DOX can directly activate cardiomyocyte apoptosis by reducing Bcl-2/Bax ratio (49). Previous studies have noted that the high expression of Bcl-2 can enhance the resistance of cells to most DNA damage factors and inhibit the apoptosis of target cells caused by most chemotherapeutic drugs and that the Bax gene, which inhibits Bcl-2, is the main apoptosis gene in human body (50,51). The proportional relationship between Bax/Bcl-2 protein is one of the key factors to determine the inhibitory effect on apoptosis (5,52). However, whether WG also has the ability to change the increase of Bax/Bcl-2 ratio caused by DOX to resist cardiomyocyte apoptosis remains to be elucidated.
In conclusion, the present study showed that WG significantly reduced DOX-induced cardiac toxicity in rats. The anti-apoptotic activity may be partly responsible for the cardioprotective effect of WG. The present study reported that WG reduces the release of cytochrome c by changing mitochondrial permeability and serve an anti-apoptotic role to achieve cardiac protection. However, more studies are required to determine the specific mechanism of WG's anti-apoptotic effect and promote the clinical application of WG in the future. The present study also lacked the corresponding positive drug control of mitochondrial protective agents and the specific difference between WG and traditional cardiovascular protective drugs is not clear; this will also be the further direction of research.
Acknowledgements
Not applicable.
Funding
Funding: No funding was received.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Authors' contributions
YW, JZ, JX, JCha, XY, JuW, JChe and JiW substantially contributed to the conception and the design of the study, and in the acquisition, analysis and interpretation of the data. JZ and JX contributed to manuscript drafting or critical revisions on intellectual content. YW and JZ approved the final manuscript version to be published. YW and JZ agreed to be accountable for all aspects of the work, so that any questions relating to research integrity or scientific accuracy in any part of the study are appropriately investigated and resolved. YW and JZ confirm the authenticity of all the raw data. All authors have read and approved the final manuscript.
Ethics approval and consent to participate
The present study was approved by the Animal Ethics Committee of Hubei Medical College.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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