Berberine Induces Autophagic Cell Death in Acute Lymphoblastic Leukemia by Inactivating AKT/mTORC1 Signaling
Authors Liu J, Liu P, Xu T, Chen Z, Kong H, Chu W, Wang Y, Liu Y
Received 19 November 2019
Accepted for publication 21 April 2020
Published 12 May 2020 Volume 2020:14 Pages 1813—1823
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 4
Editor who approved publication: Dr Sukesh Voruganti
Jian Liu,1 Peng Liu,2 Tiantian Xu,1 Zhiwei Chen,1 Huimin Kong,1 Weihong Chu,1 Yingchao Wang,1 Yufeng Liu1
1Department of Pediatrics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, People’s Republic of China; 2Department of Pediatric Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, People’s Republic of China
Correspondence: Jian Liu
The First Affiliated Hospital of Zhengzhou University, 1 East Jianshe Road, Zhengzhou 450052, People’s Republic of China
Introduction: Berberine has been reported to inhibit cancer cell growth by apoptosis induction and exhibits a protective role against cancer progression. The current study aims to investigate the effects of berberine on acute lymphoblastic leukemia (ALL) and the mechanism beyond apoptosis.
Methods: Cell viability was determined in ALL cell lines EU-6 and SKW-3 using trypan blue staining. Cell autophagy was determined by immunofluorescence and Western blot. ALL xenograft mice were established to investigate the anti-tumor effects of BBR. The molecular mechanism was explored in ALL cell lines using siRNA and signaling inhibitors.
Results: Herein, we show that berberine treatment significantly inhibits ALL cell viability and promotes cell death by inducing autophagy in a dose-dependent manner. Moreover, berberine significantly alleviates the aggressive pathological condition in ALL xenograft mice. Mechanistic studies exhibit that berberine induces autophagic death in ALL cells by inactivating AKT/mTORC1 signaling. Chemically targeting AKT/mTORC1 signaling controls berberine-induced cell autophagy in vitro, and blockade of autophagic process blunts berberine-alleviated pathological condition in vivo.
Discussion: In conclusion, our study reveals that berberine could induce ALL cell autophagic death by inactivating AKT/mTORC1 signaling that could be used to develop small molecule drug for ALL treatment.
Keywords: acute lymphoblastic leukemia, berberine, AKT/mTORC1, autophagy
Acute lymphoblastic leukemia (ALL) is an aggressive hematological malignancy caused by both B-cell and T-cell lymphoid lineage disorders. Even though most ALL patients show better prognosis in children, long-term survival remains poor in adult patients.1,2 In adults, about 75% of patients are developed from B-cell lymphoid lineage disorders, while the others are generated from T-cell lymphoid lineage disorders.3 There are several symptoms of ALL: frequent or severe nose bleeds, bleeding from the gums, bone pain, lumps caused by swollen lymph nodes in and around the neck, underarm, abdomen or groin as well as fever and shortness of breath.4 Furthermore, the infiltration of lymph nodes, liver, brain and spleen commonly occurs at the stage of diagnosis resulting in great challenges in the following treatment.5 In recent years, the 5-year survival rate for ALL patients has been improved owing to the enhanced supportive care and novel therapies, however, continuous therapy could also lead to adverse effects.6 As a consequence, it is urgent to uncover novel pathogenic mechanisms and develop related drugs for ALL treatment.
Berberine (BBR), a natural alkaloid compound that existed in traditional Chinese medicine Coptis chinensis, shows remarkable pharmacological properties in the treatment of various diseases.7 For instance, BBR has been used as a hypolipidemic drug on diabetic mellitus for years.8 In addition, BBR performs anti-inflammatory and anti-thrombotic activities through inhibiting lipoxygenase and antioxidant properties.9 It has also been reported that BBR has the ability to suppress cell proliferation by inhibiting DNA and protein synthesis in vascular smooth muscle cells.10 Furthermore, BBR-induced cell cycle arrest at G1 phase and decreased the percentage of G2/M phase in lymphocytic Jurkat cells.11
Autophagy is a multistep process that characterized by bulk autophagosomes in the cytoplasm.12 Autophagy is identified to participate in the cellular homeostasis maintenance in normal cellular processes.13 Recently, signaling pathways that involve in the autophagy have been implicated. For instance, activation of ROS/JNK prominently induced autophagy in glioma cells.14 Protein disulfide isomerase family 6 (PDIA6) inhibits autophagy of non-small cell lung cancer cells through activating MAP4K1/JNK signaling.15 In addition, inactivation of PI3K/AKT/mTOR is proved to contribute to autophagy process in the mouse cerebral cortex and in human ALL.16,17 The role of BBR on autophagy has been widely studied on various disorders, including mitochondria dysfunction,18 neurodegenerative disease,19 heart disease,20 as well as cancers.21 The autophagy-related pathway AMPK/mTOR plays an important role on BBR ameliorating inflammation and cell apoptosis.22,23 However, it is unclear whether AKT/mTOR signaling mediates BBR-mediated autophagy on ALL.
Protein kinase B (PKB, also known as AKT) hyperactivation exists in the primary bone marrow samples from patients with ALL.24 The serine kinase mTOR, a downstream effector of AKT, controls cell proliferation in various cell processes. Various studies have identified that the inhibitors of mTORC1, such as rapamycin or RAD001 show anti-ALL activities.25 PI3K/AKT/mTOR had frequently been served as a target for ALL therapy26,27 and mediates autophagy process in various cell types.28,29
In this study, our aims are to investigate the effects of BBR on ALL. We find BBR caused ALL cell death by inducing autophagy. We also investigate the underlying mechanism responsible for BBR-induced autophagy. The findings will provide crucial insight into the application of BBR on ALL treatment.
Patients and Methods
A total of 26 patients aged between 4 and 71 years, already diagnosed with ALL at the First Affiliated Hospital of Zhengzhou University, were enrolled in this study. All the patients were diagnosed according to the cytomorphology, cytochemistry, molecular genetics, multipara meter flow cytometry and immunology.30 The details of the patients’ information are presented in Supplemental Table 1. This study was approved by the Ethical Committee of the First Affiliated Hospital of Zhengzhou University (No: 20170853), and all experiments were conducted according to the Declaration of Helsinki principles. All participants and their legal guardians signed written informed consent before the experiments.
Cell Culture and Transfection
ALL cell line EU-6 was purchased from American Type Culture Collection (ATCC). SKW-3 and Jurkat cells were purchased from the Cell Bank of the Chinese Academy of Science in Shanghai, and the phenotypes of the three cell lines were described previously.31 All cells were cultured in RPMI-1640 medium supplemented with 10% fetal bovine serum at 37°C and 5% CO2. For transfection, the siRNA targeting ATG5 (5ʹ-ACCGGAAACUCAUGGAAUA-3ʹ) and the negative control were constructed and transfected into Jurkat, EU-6 and SKW-3 cells using Lipofectamine 3000 following the manufacture’s protocol. Briefly, cells were cultured in Opti-MEM® I Reduced Serum Medium (Gibco, Thermo Fisher Scientific) containing 4 μg Lipofectamine®RNAiMAX (Invitrogen, ThermoFisher Scientific) with 100 nM of ATG5 siRNA or control siRNA for 24 h. Then, the medium was removed and replaced by RPMI containing 10% FBS for other 48 h culture.
Peripheral Blood Mononuclear Cells (PBMCs) Separation
PBMCs were isolated according to the previous study.32 Briefly, Ficoll-Hypaque density gradient separation (Sigma-Aldrich) was used to isolate PBMCs, which were then cultured in plastic dishes to remove adherent cells. After that cells were cultured in RPMI-1640 medium supplemented with 10% fetal bovine serum at 37°C and 5% CO2.
Cells were placed in a 96-well plate with a density of 2000 cells per well and cultured with different concentrations (0, 12.5, 25, 50 and 100 μM) of berberine chloride (St. Louis, MO, USA) according to previous studies.33 For mechanistic experiments, cells were treated with 100 μM BBR in the presence or absence of autophagy inhibitors 3-MA (1 mM) or Bafilomycin A1 (Baf A1, 0.5 μM), mTORC1 signaling inhibitor rapamycin (0.5 μM) or MHY1485 (2 μM) to validate the contribution of autophagy and AKT/mTORC1 signaling to the effects of BBR on cell autophagy. After 24 h culture, 10 μL Cell Counting Kit-8 (CCK-8) was added in each well and incubated for 1 h. Cell viability was detected using a microplate reader at the absorbance of 450 nm. The cells collected from different groups were stained by trypan blue (Sigma, USA) and evaluated under a microscope according to the manufacture’s instruction. The dead cells were stained in blue. The percentage of death cells was determined by counting total and blue cells in the five random microscopic fields.
After treatment, cells were harvested and lysed by RIPA buffer (Invitrogen). Total protein was measured by BCA protein assay kit (Beyotime Biotechnology, Shanghai, China), separated on 10% SDS-PAGE, and then transferred onto polyvinylidene fluoride (PVDF) and blocked with 5% skimmed milk for 1 h at room temperature. After three times washing with 1×TBST buffer, the PVDF membrane was incubated with the primary antibodies (anti-S6, 1:1000, Abcam; anti-p-S6, 1:1000, Abcam; anti-AKT, 1:500, Abcam; anti-p-AKT (T308), 1:500, Abcam; anti-p-AKT (S473), 1:1000, Abcam; LC3-I/II, 1:500, Abcam; GAPDH, 1:1000, Abcam; Beclin-1, 1:2000, Abcam; anti-ATG5, 1:1000, Abcam) at 4°C for 24 h. Next, the membrane was washed using 1×TBST and followed by incubation with horseradish peroxidase (HRP)-conjugated secondary antibody at room temperate for 1 h. The protein bands were visualized using enhanced chemiluminescence. GAPDH was used as an internal control.
For immunofluorescence, cells were fixed with PHEMO buffer for 10 min and permeabilized with 0.5% Triton X-100 at room temperature for 15 min. After washing with PBS three times, cells were incubated with 3% BSA for 30 min. The anti-LC3 antibody (Santa Cruz) at an appropriate concentration was incubated with the cells overnight at 4°C. Afterward, cells were incubated with Alexa Flour-conjugated goat anti-rabbit IgG at room temperature for 1 h. Images were visualized using confocal microscopy (Leica STED, Germany).
NOD-SCID mice (6–8 weeks) were housed in the ventilated cage with a temperature of 22± 2°C and a 12:12 h light/dark cycle. All mice were irradiated with a sublethal dose of 250 cGy γ-radiation using a radiation source before cell transplant as described previously.34 For WT ALL mice, NOD-SCID mice were intravenously (i.v.) injected with 1×106 WT ALL cells. To generate ATG5−/- ALL mice, NOD-SCID mice were i.v. injected with 1×106 siATG5 ALL cells. The different group mice were then orally administrated with BBR at a dose of 10 mg/kg/d for 2 weeks according to the previous study.35,36 The control mice were received the same volume of DMSO. The mice were assessed by flow cytometric analysis for human CD45+ cells in the bone marrow and spleen at 1 week after completion of treatment. The blood was sampled from the orbital venous, and the survival condition was recorded every day for 8 weeks. This study was approved by the Ethic Committee of The First Affiliated Hospital of Zhengzhou University (No: 20170881), and all experiments were handled in accordance with the animal care and use guidelines.
Hematologic Parameter Test
The blood parameters, such as red blood cells (RBC), white blood cells (WBC) and hemoglobin, were detected using an automatic blood cell analyzer according to the manufacture’s instruction.
All experiments were repeated at least three independent times. Results were presented as mean±SD. Student’s t-test was used for comparisons between groups, while Statistical significance among multiple groups was analyzed using a one-way analysis of variance. p<0.05 was considered as statistically significant.
BBR Promotes ALL Cell Death
To determine the potential effects of BBR on ALL, ALL cell lines Jurkat, EU-6 and SKW-3 were treated by BBR with different concentrations of 0, 12.5, 25, 50 and 100 μM. Cell viability and death were determined using CCK-8 and trypan blue staining, respectively. It showed that BBR treatment induced a significantly reduced viability of Jurkat, EU-6 and SKW-3 in a dose-dependent manner (Figure 1A). To confirm the effects of BBR on ALL, the peripheral blood mononuclear cells (PBMCs) were separated from peripheral blood of ALL patients and subjected to BBR for in vitro treatment. The results revealed that BBR treatment incurred a significantly reduced viability of PBMCs in a dose-dependent manner (Figure 1A). Consistently, BBR treatment led to an increased death of Jurkat, EU-6, SKW-3 and PBMCs in a dose-dependent manner (Figure 1B). The above data indicated that BBR-induced ALL cell death.
BBR Induces Autophagic Death in ALL Cells
The previous study reported BBR promoted autophagic cell death in lung cancer cells.37,38 Next, we investigated whether or not autophagic changes occurred on ALL cell lines and ALL-derived PBMCs after BBR treatment by detecting the autophagic markers light chain 3 (LC3) and Beclin 1. The results showed that BBR treatment increased the percentage of LC3-positive cells in a dosage-dependent manner (Figure 2A and B). Consistently, the expressions of Beclin-1 and LC3-II were all increased by BBR in a dosage-dependent manner (Figure 2C). These findings suggested that BBR treatment induced autophagic death in ALL cells.
Inhibition of Autophagy Reverses BBR-Induced Decreased Cell Viability
Next, we chemically verified the autophagic effects of BBR on ALL cells using autophagy inhibitors 3-methyladenine (3-MA) and Bafilomycin A1 (Baf A1). Jurkat, EU-6, SKW-3 and PBMC cells were treated by BBR in the presence or absence of 3-MA or Baf A1, respectively. Intriguingly, both 3-MA and Baf A1 significantly rescued BBR-induced decreased cell viability (Figure 3A). Meanwhile, we genetically verified the autophagic effects using siRNA targeting autophagic mediator ATG5 in Jurkat, EU-6 and SKW-3 (Supplemental Figure 1). The knockdown of ATG5 significantly reversed BBR-induced decreased cell viability and blunted BBR-induced cell autophagy in ALL cells (Figure 3B and C). Taken together, these results indicated that BBR-induced ALL cells into autophagic death.
BBR Induces ALL Cell Autophagy by Inactivating AKT/mTORC1 Signaling
Previous studies showed that AKT/mTORC1 signaling mediated cell autophagy in hepatocytes,28 colorectal cancer cells,39 human lung and pancreatic cancer cells.40 Here, we investigated whether AKT/mTORC1 signaling was involved in BBR-induced autophagy in ALL cells. EU-6 cells were treated with different concentrations of BBR, and the protein expressions of AKT/mTORC1 signaling-associated proteins S6, AKT and their phosphorylated proteins (p-S6, p-AKT) were detected. We found BBR treatment markedly inhibited activation of AKT/mTORC1 signaling as showed by the decreased protein expressions of p-S6, p-AKT in a dosage-dependent manner (Figure 4A). To validate AKT/mTORC1 is responsible for the BBR-induced autophagy in ALL cells, EU-6 cells were treated with BBR in the presence or absence of mTORC1 inhibitor rapamycin or activator MHY1485, respectively. It showed that rapamycin exacerbated BBR-induced decreased expressions of p-S6, p-AKT. Conversely, MHY1485 significantly attenuated BBR-induced inhibition of AKT/mTORC1 signaling (Figure 4B). Moreover, Inhibition or activation of AKT/mTORC1 signaling also increased or decreased BBR-induced cell autophagy as showed by the increased or decreased autophagic markers Beclin-3 and LC3-II as well as the percentage of LC3-positive cells, respectively (Figure 4B and C). The results indicated that BBR-induced ALL cell autophagy via inactivating AKT/mTORC1 signaling pathway.
Inhibition of AKT/mTORC1 Intensifies BBR-Induced Decreased Cell Viability
Next, we confirmed whether inhibition of AKT/mTORC1 intensified BBR-induced decreased cell viability. Jurkat, EU-6, SKW-3 and PBMC cells were treated by BBR in the presence or absence of MHY1485 or rapamycin, respectively. As it is presented in Figure 5A, MHY1485 or rapamycin treatment significantly attenuated or intensified BBR-induced reduced cell viability, respectively. Meanwhile, the increased dead cells induced by BBR were also significantly decreased or enhanced by MHY1485 or rapamycin treatment, respectively (Figure 5B). These data suggested that AKT/mTORC1 signaling is involved in BBR-induced ALL cell death.
BBR Treatment Alleviates Leukemia Condition in ALL Xenograft Mice
Next, the therapeutic effect of BBR on ALL was investigated in vivo. The NOD-SCID mice were intravenously injected with EU-6 cells to establish the ALL xenograft mice. Then, the mice were administrated with BBR or the same volume of solution as the control. It was showed that BBR treatment significantly enhanced the total survival rate and reduced leukemia condition in ALL xenograft mice (Figure 6A and B). Moreover, the numbers of human-derived CD45-positive cells in bone marrow and spleen are reduced in BBR-treated ALL mice as compared with ALL mice (Figure 6C and D). Of note, the levels of red blood cell and hemoglobin are no different in control and BBR-treated mice (Supplemental Figure 2).
In vivo Knockdown of ATG5 Results in Aggressive Pathological Condition
To investigate the molecular mechanism underlying the anti-leukemia effect of BBR on ALL in vivo, the ALL xenograft mice bearing ATG5 deficiency were established by injection of EU-6 cells with ATG5 knockdown. Then, the mice were treated with BBR as above. As it is presented in Figure 7A and B, the wild type (WT) ALL and ATG5 deficiency ALL mice (ATG5−/-) exhibited lower survival rate and obvious leukemia condition with a higher level of leukocyte numbers (about 3.62×109, 3.67×109) as compared with healthy mice (about 0.98×109, Figure 6A). BBR treatment significantly increased survival rate and alleviated leukemia condition in both WT and ATG5−/- ALL mice. More importantly, ATG5 knockdown significantly abrogated BBR-caused reversion of survival rate and leukemia condition compared with WT ALL mice. The number of human-derived CD45-positive cells in bone marrow and spleen is increased in ATG5−/- ALL mice as compared in ALL mice after BBR treatment (Figure 7C and D). Meanwhile, either BBR treatment or ATG5 knockdown did not affect the levels of red blood cells and hemoglobin in mice (Supplemental Figure 3). These results demonstrated that BBR alleviated ALL leukemia condition through mediating the autophagy process.
In the present study, we investigated the anti-tumor effects and potential mechanism of BBR on ALL. We find that BBR inhibits ALL cell viability and induces autophagy. While autophagy inhibitors 3-MA and Baf A1 could significantly reverse BBR-reduced cell viability. Mechanistic research revealed that AKT/mTORC1 was inactivated by BBR, and inhibition of AKT/mTORC1 activation enhanced BBR-induced cell death. Consistently, the in vivo experiments affirmed that knockdown of ATG5 blunted the ameliorating effects of BBR and resulted in an aggressive pathological condition. This study indicates that BBR served as a preferable agent to efficiently alleviate ALL by promoting autophagic cell death.
Berberine, the widely studied isoquinoline alkaloids, could be used to protect against disorders, such as inflammation, diabetes, hyperlipidemia, parasites, reactive oxygen species, as well as cancers, showed its protective role on ALL in the present study.41 Berberine has a very low oral bioavailability and toxicity. It is widely distributed in liver, kidney and fat and has a round 36 h for plasma concentration maintenance.42 No significant changes in hematological or biochemical parameters were detected in mice treated with berberine.36 It has been reported that autophagy induces cell death and maintains the stability of body by clearing the dysfunctional organelles and incorrect folding proteins.43,44 Recently, autophagy has been implicated in various human diseases and showed an active role against tumors.45,46 For instance, quercetin inhibits cell growth of hepatocellular carcinoma via promoting autophagy in mice.47 Dioscin promotes alveolar macrophage autophagy and further alleviates crystalline silica-induced pulmonary inflammation and fibrosis.48 Accumulating studies also demonstrated that autophagy is involved in the treatment of ALL.49,50 In the present study, we found that BBR-induced cell death by promoting autophagy in ALL cells, indicating the therapeutic role of BBR on ALL. It has been reported that more than 40 autophagy-related genes (ATGs) are involved in the regulation of autophagy,51 among which ATG5 is recognized as a key marker for autophagosome formation. ATG5 can promote autophagy and inhibit endoplasmic reticulum (ER) stress.52 Specifically, microtubule-associated protein 1 light chain 3 (LC3) is considered as a specific marker for autophagosome formation and beclin-1 is widely used in assessing autophagy status. In the current study, we found that BBR treatment significantly increased LC3-I, LC3-II and beclin-1 expression, while ATG5 knockdown abolished the effect of BBR-induced autophagy. The above findings strongly revealed that the anti-ALL role of BBR is attributed to the activation of the autophagic process.
mTORC1 activation is responded to diversity stimuli, such as cytokines, growth factors and antigen receptors.53 And the elevated activity of mTORC1 is observed in various diseases, including neurodegeneration, cancers and metabolic disorders.54 The dysregulated mTORC1 also mediates tumor cell behaviors, for example, mTORC1 regulates cell growth and autophagy in colorectal cancer cells.55 The activation of mTORC1 contributes to cancer cell survival.56 In addition, the hyperactivation of AKT/mTORC1 results in excessive cancer cell proliferation, as well as the impaired autophagy-mediated cell death.40 In the present study, the expression of AKT/mTORC1 markers p-S6 and p-AKT was decreased in BBR-exposed ALL cells. Further, blocking of AKT/mTORC1 by rapamycin significantly promoted autophagy activation and cell death, and in turn suppressed cell viability, and ultimately resulted in an alleviated pathological condition of ALL. The data verified AKT/mTORC1 signaling is involved in BBR-induced cell autophagy in ALL.
In summary, we focused on the pharmacological property of BBR in treating ALL and found that BBR treatment significantly ameliorated ALL condition by promoting tumor cell autophagic death. The further mechanistic study revealed that BBR promoted cell autophagy by inactivation of the AKT/mTORC1 signaling pathway. Our study first identified BBR ameliorates ALL by inducing autophagy and that might be used as a potential agent for ALL treatment.
BBR, berberine; ALL, acute lymphoblastic leukemia; PDIA6, protein disulfide isomerase family 6; WT, wild type; WBC, white blood cell; RBC, red blood cell; ATGs, autophagy-related genes; ATCC, American Type Culture Collection; HRP, horseradish peroxidase; i.v, intravenously; LC3, light chain 3; ER, endoplasmic reticulum.
This study was supported by a grant from the National Natural Science Foundation of China (No. 81600133 to J.L.).
The authors declare no conflicts of interest in this work.
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