Open Access

Salidroside inhibits chronic myeloid leukemia cell proliferation and induces apoptosis by regulating the miR‑140‑5p/wnt5a/β‑catenin axis

  • Authors:
    • Danjun Chen
    • Cong Luo
  • View Affiliations

  • Published online on: September 2, 2021     https://doi.org/10.3892/etm.2021.10684
  • Article Number: 1249
  • Copyright: © Chen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Salidroside, an active ingredient of Rhodiola rosea, exhibits antitumor effects in various types of cancer. However, the role of salidroside in chronic myeloid leukemia (CML) has not been elucidated. In the presents study, cell viability was assessed by CCK‑8 assay, while apoptosis was detected by flow cytometry. Reverse transcription‑quantitative PCR analysis was used to examine the expression levels of miR‑140‑5p in human CML cell lines. The expression levels of apoptosis and cell cycle‑associated proteins and of the wnt5a/β‑catenin signaling pathway were determined by western blot analysis. Bioinformatic analysis and luciferase reporter assays were employed to investigate the association between miR‑140‑5p and wnt5a. The results revealed that exposure of CML cells to salidroside (80 µM) inhibited cell proliferation and promoted apoptosis. In addition, salidroside treatment led to the upregulation of miR‑140‑5p expression. Furthermore, the inhibition of wnt5a/β‑catenin signaling pathway and the pro‑apoptotic effects induced by salidroside were attenuated by miR‑140‑5p silencing. Notably, wnt5a was revealed to be a direct target of miR‑140‑5p. The present findings indicated that salidroside exerted anti‑CML effects through regulating miR‑140‑5p by suppressing the wnt5a/β‑catenin signaling pathway. The present study provided evidence of the therapeutic role of salidroside in CML.

Introduction

Chronic myeloid leukemia (CML) is a clonal malignant tumor resulting from hematopoietic disorders, with an incidence of 1-2/10,000 adults per year (1). Currently, the most effective treatment for CML is bone marrow transplantation. However, high risk of mortality and recurrence rates and the difficulty in obtaining a matched donor limit its application (2). Although many patients with CML have a response to hematopoietic stem cell implantation, refractory disease is common, and relapse represents the major cause of treatment failure (3). Therefore, it is urgent to understand the pathogenesis of CML and discover novel effective treatments for CML.

In most cases, CML arises owing to the aberrant formation of a chimeric gene for a constitutively active tyrosine kinase. Thus, tyrosine kinase inhibitors (TKIs) are approved for the first-line treatment of chronic phase CML (4). However, second-generation TKIs have cardiovascular risks that are greater than with imatinib treatment (5). To the best of our knowledge, traditional Chinese medicines or natural products exhibit advantages in tumor prevention and treatment (6,7). Several lines of evidence suggest that salidroside, a major active component of Rhodiola rosea which has been widely used as a tonic herb exhibiting antitumor properties in various cancers, may be a promising novel drug candidate for cancer therapy. For instance, salidroside reduced cell proliferation and induced G1 phase cell cycle arrest and apoptosis of renal cell carcinoma cells (8). In human colorectal cancer HT29 cells, salidroside enhanced autophagic effects by inducing apoptosis via the inactivation of PI3K/Akt/mTOR signaling pathway (9). Salidroside suppressed migration and invasion and induced apoptosis of poorly differentiated thyroid cancer cells via the inhibition of JAK2/STAT3 pathway (10). Furthermore, it has been shown that salidroside inhibited the malignant behaviors of gastric cancer cells (11). Kang et al (12) reported that salidroside induced the angiogenesis, migration and metastasis of breast cancer cells through the STAT3 signaling pathway. Yu et al (13) reported that salidroside was a potent inducer of apoptosis in human ovarian cancer cells through the p53 signaling pathway. Ren et al (14) reported that salidroside had anticarcinogenic activities in human lung cancer cells by suppressing proliferation, migration and invasion through AKT and MEK/ERK signaling. However, the potential antitumor function of salidroside in CML has not been extensively investigated.

The present study aimed to elucidate whether salidroside could be used as a therapeutic agent to modulate the growth of CML cell lines and to further evaluate the antitumor potential of salidroside against CML. Considering the anticancer mechanisms of Chinese medicinal herbs targeting microRNAs (miRNAs), we herein examined the potential mechanisms underlying salidroside's antitumor properties by focusing on miRNAs (15,16). miR-140-5p is one of the most studied miRNAs in the field of human cancer (17,18). In regard of CML, miR-140-5p was observed to be downregulated in CML patients and CML cell lines, and the overexpression of miR-140-5p promoted CML cell apoptosis (19). Based on these previous observations, miR-140-5p was selected for further investigation. The findings of the present study may provide evidence for novel therapeutic strategies for CML.

Materials and methods

Cell lines

CML cell lines, K562 and KCL22, purchased from American Type Culture Collection, were cultured in RPMI-1640 media with fetal bovine serum (FBS), penicillin and streptomycin (all from Gibco; Thermo Fisher Scientific, Inc.) at 37˚C in a normoxic environment (5% CO2 and 95% air). Cells were incubated with 0, 20, 40, 60, 80 and 100 µM salidroside (Sigma-Aldrich; Merck KGaA; cat. no. 43866; analytical grade; purity ≥98.0%) for 12, 24, 48 and 72 h. When indicated, cells were transfected with miR-140-5p mimic (5'-GACUACGAUAUCGAGCCAUA-3'; 50 nM), inhibitor (5'-UGUACACACGAUUGACGUG-3'; 100 nM) or negative controls (NC; miR-NC, 5'-AGUCUAACGCGAGCGUAUAA-3'; 50 nM; inhibitor-NC, 5'-GGUAUUACAAAGGUCGCACAA-3'; 100 nM), which were obtained from Shanghai GenePharma Co., Ltd., by using Lipofectamine 2000 (Thermo Fisher Scientific, Inc.), according to the manufacturer's instructions. After 48 h, the cells were harvested for further experiments.

Cell viability assay

Cell viability was determined by CCK-8 assay (Beyotime Institute of Biotechnology). Briefly, CCK-8 solution (10 µl) was added to each well at 12, 24, 48 and 72 h. After incubation at 37˚C for 4 h, the absorbance was detected at 450 nm.

Cell apoptosis assay

K562 and KCL22 cells were inoculated in a six-well plate for 24 h. Next, the culture medium was replaced with a medium containing 10% FBS. After 24 h, the cells were harvested and stained with Annexin V-fluorescein isothiocyanate (FITC) and propidium iodide (PI) using a double-staining apoptosis detection kit (Invitrogen; Thermo Fisher Scientific, Inc.) following the manufacturer's protocols. Cell apoptosis was determined by flow cytometry analysis using a FACSCanto II flow cytometer (Becton-Dickinson and Company) and calculated using Cell Quest acquisition software (version 2.9; BD Biosciences).

RNA extraction and reverse transcription-quantitative PCR analysis

Total RNA was extracted from K562 and KCL22 cells by using TRIzol reagent (Invitrogen; Thermo Fisher Scientific, Inc.) and was reverse transcribed to cDNA by using MiRcute miRNA first-strand cDNA synthesis kit (Tiangen Biotech Co., Ltd.), according to the manufacturer's protocol. Relative expression levels of miR-140-5p were determined using MiRcute miRNA qPCR detection kit (Tiangen Biotech Co., Ltd.) on an ABI 7500 real-time PCR system (Applied Biosystems; Thermo Fisher Scientific, Inc.). The thermocycling conditions used for qPCR were as follows: Initial denaturation at 95˚C for 3 min; followed by 40 cycles of 12 sec at 95˚C and 40 sec at 62˚C; the fluorescence signal was collected after 40 cycles. Relative fold changes in mRNA expression were calculated using the formula 2-ΔΔCq method (20). U6 was used as an internal control. The primer sequences were as follows: miR-140-5p, forward, 5'-TGCGGCAGTGGTTTTACCCTATG-3' and reverse, 5'-CCAGTGCAGGGTCCGAGGT-3'; U6, forward, 5'-CTCGCTTCGGCAGCACATA-3' and reverse, 5'-AACGATTCACGAATTTGCGT-3'.

Western blotting

RIPA lysis buffer (Beyotime Institute of Biotechnology) was used to extract the protein from cultured cells. Total protein concentration was determined using a bicinchoninic acid protein assay kit (Beyotime Institute of Biotechnology) according to the manufacturer's instructions. Equal amounts (40 µg/lane) of protein were loaded onto a 12% SDS-PAGE gel and then electroblotted onto polyvinylidene fluoride membranes. Following blocking with 5% skimmed milk for 2 h at room temperature, these membranes were incubated with primary antibodies (1:1,000 dilution) overnight at 4˚C. The primary antibodies were (Cell Signaling Technology, Inc.): Cyclin D1 (cat. no. 55506), p21 (cat. no. 2947), Bcl-2 (cat. no. 3498), Bax (cat. no. 5023), pro-caspase-3 (cat. no. 14220), cleaved caspase-3 (cat. no. 9579) and β-actin (cat. no. 4970). The next day, membranes were incubated at room temperature for 2 h with FITC-labeled IgG secondary antibodies (cat. no. 7074; 1:2,000 dilution; Cell Signaling Technology, Inc.). The bands were visualized using Novex ECL HRP chemiluminescent substrate reagent kit (Invitrogen; Thermo Fisher Scientific, Inc.) and the protein expression levels were quantified using ImageJ software (version 1.6.0; National Institutes of Health).

Luciferase activity assay

Binding sites for miR-140-5p on the 3'untranslated region (UTR) of wnt5a were identified using the StarBase database (http://starbase.sysu.edu.cn/) (21) and were confirmed by performing a dual luciferase reporter assay. The 3'-UTR region of wnt5a encompassing the putative miR-140-5p binding site was amplified using PCR and was subsequently sub-cloned into the psiCHECK-2 dual luciferase vector (Promega Corporation). K562 and KCL22 cells were co-transfected with wnt5a recombinant plasmids [wild-type (wnt5a-WT) or mutant (wnt5a-Mut)] and miR-140-5p mimic or miR-NC using Lipofectamine® 2000 (Thermo Fisher Scientific, Inc.). After 48 h transfection, luciferase activity was determined using the dual luciferase assay kit after adding firefly or Renilla luciferase reagents (Promega Corporation), according to the manufacturer's instructions.

Statistical analysis

Data were expressed as mean ± standard deviation. Comparisons were assessed using SPSS 19.0 (IBM Corp.). Differences between two groups were analyzed by Student's t-test. Comparisons between multiple groups were performed by one-way analysis of variance followed by Tukey's post hoc test. P<0.05 was considered to indicate a statistically significant difference.

Results

Salidroside inhibits proliferation and downregulates cell cycle-related protein expression in CML cells

The effects of salidroside on the proliferation and cell cycle-related protein expression of CML cells were first determined. In the present study, human CML cell lines K562 and KCL22 were treated with different concentrations (0, 20, 40, 60, 80 and 100 µM) of salidroside for 12, 24, 48 and 72 h. Then, changes in cell viability were monitored by CCK-8 assay. The results revealed that, compared with the untreated cells, salidroside decreased the numbers of viable K562 (Fig. 1A) and KCL22 (Fig. 1B) cells in a dose and time-dependent manner. Since the IC50 of viability was presented at the concentration of 80 µM following 24 h treatment, the 80 µM dose and the 24 h timepoint were selected for further experimental treatments with salidroside in the present study. Next, changes in expression levels of cell cycle regulatory proteins were assessed. Western blotting revealed that salidroside treatment resulted in the upregulation of p21 and the downregulation of Cyclin D1 expression levels in K562 and KCL22 cells (Fig. 1C and D). These data suggested that salidroside suppressed the proliferation of human CML cells and regulated cell cycle-related proteins.

Salidroside promotes the apoptosis of CML cells

Furthermore, the effects of salidroside on CML cell apoptosis were assessed. The results showed that after treatment with 80 µM salidroside for 24 h, K562 and KCL22 cell apoptosis was induced, as demonstrated by flow cytometry analysis with Annexin V-FITC/PI double staining (Fig. 2A and B). In addition, the proapoptotic protein Bax and apoptosis marker protein cleaved caspase-3 were significantly upregulated, while the antiapoptotic protein Bcl-2 expression was decreased, following treatment of K562 and KCL22 cells with salidroside, as evidenced by western blotting (Fig. 2C and D). These data indicated that salidroside had proapoptotic effects on cultured human CML cells.

Salidroside affects CML cell proliferation, apoptosis and cell cycle-related protein expression by upregulating miR-140-5p

The results of qPCR analysis demonstrated that, in both CML cell lines, treatment with salidroside resulted in the upregulation of miR-140-5p expression (Fig. 3A). Furthermore, silencing of miR-140-5p expression by using a miR-140-5p-specific inhibitor (Fig. 3B) reversed the effects of salidroside on cell proliferation (Fig. 3C and D), on the Cyclin D1 and p21 protein expression (Fig. 3E and F), on cell apoptosis (Fig. 3G and H), and on the the protein levels of Bcl-2, Bax and cleaved caspase-3 (Fig. 3I and J). Additionally, when miR-140-5p was overexpressed by transfection with a miR-140-5p mimic (Fig. S1A), the cell viability was significantly inhibited (Fig. S1B), while cell apoptosis was significantly increased (Fig. S1C and D) for both K562 and KCL22 cell lines. The present results indicated that salidroside might influence CML cells through the regulation of miR-140-5p.

Salidroside regulates the miR-140-5p/wnt5a/β-catenin axis in CML cells

Finally, the potential involvement of miR-140-5p in salidroside-modulated signaling pathways was investigated. The online bioinformatic database StarBase was used to identify potential target genes of miR-140-5p. According to the analysis, wnt5a was predicted to be a potential target gene of miR-140-5p. The predicted binding sites between miR-140-5p and wnt5a are presented in Fig. 4A. In order to investigate whether miR-140-5p regulated wnt5a expression by directly binding to its 3'UTR, a luciferase reporter assay was performed. The results showed that miR-140-5p overexpression significantly decreased the luciferase activity of wnt5a-WT, whereas K562 and KCL22 cells co-transfected with Wnt5a-Mut and miR-140-5p mimic showed no obvious changes in their luciferase activity (Fig. 4B and C). In addition, ectopic expression of miR-140-5p in K562 and KCL22 cells resulted in a decrease of Wnt5a protein expression levels (Fig. 4D). These findings indicated that wnt5a was a direct target of miR-140-5p in CML cells. The present study then explored whether miR-140-5p could mediate the effects of salidroside on the wnt5a/β-catenin pathway. As shown in Fig. 4E and F, the protein expression levels of Wnt5a and β-catenin were significantly decreased by salidroside. Conversely, miR-140-5p inhibition reversed this effect.

Discussion

The present study provided the first demonstration of the antitumor mechanism of salidroside in CML. The current findings revealed that salidroside accelerated CML cell apoptosis and inhibited proliferation through downregulation of miR-140-5p and the wnt5a/β-catenin signaling pathway.

A previous study has shown that salidroside inhibited the growth of K562 cells in a dose and time-dependent manner, and induced apoptosis (22). Similarly, the present results demonstrated that salidroside significantly reduced the cell viability of two CML cell lines (K562 and KCL22) in a concentration-dependent manner. In addition, salidroside at 80 µM significantly reduced CML cell proliferation, and induced apoptosis. In the cell cycle progression, Cyclin D1, a regulatory subunit of cyclin-dependent kinase (CDK)4 and CDK6, is required for G1/S transition of the cell cycle to entry into the S-phase (23). p21 is a potent CDK inhibitor by abrogating all cyclin-CDK complexes and thus functions as a regulator of cell cycle progression at G1 and S phases (24). Qie et al (23) and Ren et al (14) found that salidroside could cause G1-phase arrest, a decrease of cyclin D1 expression and an increase of p21 expression in breast cancer cells and lung cancer cells. The current study revealed that salidroside treatment resulted in a decrease in the expression of Cyclin D1, but an increase in the expression of p21, in K562 and KCL22 cells.

Extensive research on miRNAs has confirmed that they serve important roles in the occurrence and development of CML by acting as oncogenes or tumor suppressors (25). Among them, the antitumor roles of miR-140-5p have been described in multiple types of human cancer by regulating tumor cell proliferation, apoptosis and cell cycle progression (26). A previous study has demonstrated that miR-140-5p was downregulated in CML and its overexpression was associated with the proliferation and apoptosis of CML cells by targeting SIX homeobox 1(19). Based on this previous literature, the present study speculated that targeting miR-140-5p might be a promising strategy for CML treatment. The present study further revealed that the addition of salidroside upregulated the expression of miR-140-5p in CML cells, implying that miR-140-5p might be implicated in the antitumor effects of salidroside.

Accumulating studies have highlighted the involvement of several signaling pathways in the initiation and development of CML, including NF-κB (27), JAK/STAT (28), and PI3K/AKT/mTOR (29). In recent years, several reports have proposed that salidroside displays its antitumor activities via the modulation of p53(13), JAK2/STAT3(30) and Wnt/β-catenin (31) signaling pathways. Cha et al (32) uncovered that miR-140-5p suppressed gastric cancer cell proliferation and invasion by regulating WNT1 expression. Han et al (33) showed that miR-140-5p promoted the cerebral protective effects of dexmedetomidine against hypoxic-ischemic brain damage in neonatal rats by targeting Wnt1 through the negative regulation of the Wnt/β-catenin signaling pathway. Zhao et al (34) reported that miR-140-5p hindered cell proliferation, invasion and tumorigenesis by targeting SRY-box transcription factor 4 via inactivation of the Wnt/β-catenin and NF-κB signaling pathways in malignant melanoma. The present study further investigated whether Wnt/β-catenin signaling was involved in the antitumor action of salidroside in CML cells, because Wnt5a was identified as a target of miR-140-5p. Additionally, the present results demonstrated that salidroside treatment blocked the activation of the Wnt5a/β-catenin signaling pathway. Notably, the effects of salidroside on the Wnt5a/β-catenin signaling pathway were partially reversed by miR-140-5p inhibition, suggesting that salidroside blocked the Wnt5a/β-catenin signaling pathway possibly through the upregulation of miR-140-5p. The present study has nonetheless several limitations. Firstly, clinical evaluations and in vivo experiments were not performed at this time. Furthermore, a detailed cell cycle analysis is needed to further evaluate the effects of salidroside on K562 and KCL22 cyclin expressions. In addition, other molecules and signaling pathways may be involved in the antitumor effects of salidroside and future studies will be required to elucidate these.

In conclusion, the present findings confirmed the antitumor properties of salidroside in CML via the inhibition of Wnt5a/β-catenin signaling pathway by upregulating miR-140-5p expression. Further studies are needed to confirm the potential of salidroside as a therapeutic agent in CML.

Supplementary Material

Overexpression of miR-140-5p affects cell viability, apoptosis and apoptosis-related protein expression in CML cells. K562 and KCL22 cells were transfected with miR-140-5p mimic or mimic-NC. (A) The transfection efficiency was confirmed by reverse transcription-quantitative PCR. (B) CCK-8 assay was performed to assess cell viability. (C) Apoptosis was measured by flow cytometry. (D) The protein expression levels of Bcl-2, Bax, pro-caspase-3 and cleaved caspase-3 were determined by western blot analysis. Resultsfor Bcl-2 and Bax were plotted as fold-ratios relative to β-actin. Results for cleaved caspase-3 were plotted as fold-ratios relative topro-caspase-3. ***P<0.001 vs. mimic-NC. CML, chronic myeloid leukemia; NC, negative control; OD, optical density.

Acknowledgements

Not applicable.

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Authors' contributions

CL designed the study. CL and DC performed the experiments, analyzed the data and prepared the manuscript. CL reviewed the manuscript. All authors read and approved the final manuscript. CL and DC confirm the authenticity of all the raw data. All authors agree to be accountable for all aspects of the research in ensuring that the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Chen D and Chen D: Salidroside inhibits chronic myeloid leukemia cell proliferation and induces apoptosis by regulating the miR‑140‑5p/wnt5a/β‑catenin axis. Exp Ther Med 22: 1249, 2021
APA
Chen, D., & Chen, D. (2021). Salidroside inhibits chronic myeloid leukemia cell proliferation and induces apoptosis by regulating the miR‑140‑5p/wnt5a/β‑catenin axis. Experimental and Therapeutic Medicine, 22, 1249. https://doi.org/10.3892/etm.2021.10684
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Chen, D., Luo, C."Salidroside inhibits chronic myeloid leukemia cell proliferation and induces apoptosis by regulating the miR‑140‑5p/wnt5a/β‑catenin axis". Experimental and Therapeutic Medicine 22.5 (2021): 1249.
Chicago
Chen, D., Luo, C."Salidroside inhibits chronic myeloid leukemia cell proliferation and induces apoptosis by regulating the miR‑140‑5p/wnt5a/β‑catenin axis". Experimental and Therapeutic Medicine 22, no. 5 (2021): 1249. https://doi.org/10.3892/etm.2021.10684