Network Pharmacology to Explore the Mechanism of Prunella vulgaris L. Against Prolactinoma

Abstract

Objectives

Prolactinoma is a common intracranial tumor with a high incidence and serious harm to human health. At present, there is only one therapeutic drug in China, bromocriptine, and the Chinese herb Prunella vulgaris L. (P. vulgaris)(PV) has shown certain anti-prolactinoma effects in the early stage. We expect to develop a candidate drug against prolactinoma.

Materials and Methods

First, the extracts of P. vulgaris L.(PVE)were extracted with water, and the cell proliferation test of rat pituitary tumor cells MMQ was checked by the Cell Counting Kit-8 (CCK-8) assay. Then, core targets and correlative pathways were selected by the “protein–protein interaction” (PPI) network and the “PV–Target–Prolactinoma” network. The core targets and main components simulate the binding by molecular docking. Finally, the PVE and MMQ cells were used to verify the results.

Results

Through the CCK-8 assay, the PVE inhibited the proliferation of MMQ cells. From the network pharmacology, the 21 targets, 9 signaling pathways, and 20 gene ontology (GO) projects were attained (p < 0.05). As a result the estrogen receptor α (ESR1), RAC-alpha serine/threonine-protein kinase(AKT1), and mitogen-activated protein kinase 3(MAPK3)were the core targets of protein against prolactinomas, which was in line with western blotting analysis.

Conclusion

Our findings demonstrate that the PVE was verified against prolactinomas through the ESR1, MAPK3 targets, and the phosphoinositide 3-kinase/protein kinase B pathway.

Keywords

Prolactinoma network pharmacology molecular docking

Introduction

Prolactinoma is the most frequent pituitary neuroendocrine tumor, and recent epidemiological reviews have estimated that this tumor subtype accounts for 53% of pituitary neuroendocrine tumors (Inder & Jang, 2022). Prolactinoma causes various serious hazards to mankind’s health, for instance, amenorrhea, sexual dysfunction, galactorrhea, hyperprolactinemia, and infertility (Maiter, 2016; Zhou et al., 2018). In China, bromocriptine is a first-line drug against prolactinoma. Drug resistance frequently occurs, which brings clinical challenges (Wang et al., 2021; Xiao et al., 2020). Now that the pathogenesis of prolactinoma is unclear, drug development and therapeutic targets have occasion to be investigated imminently. So, seeking effective drugs with low side effects is essential. It has been reported that Traditional Chinese medicines have good effects on treating Prolactinoma, which has recently drawn the attention of scientists worldwide (Wei et al., 2017, 2018).

At present, although there are relevant reports of Prunella vulgaris (PV) in the treatment of other tumors, there are few studies on the effect of anti-prolactinoma (Gao & Xu, 2019; Lin et al., 2020; Luo et al., 2022). In previous studies, Ding et al. (2020) revealed that the prescription of Huiru Yizheng was effective in the treatment of prolactinoma, and its mechanism was linked to the inhibition of anomalous activation of the phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT)/mammalian target of rapamycin (mTOR) signal pathway (Wang et al., 2013, 2017). This prescription is composed of many kinds of Traditional Chinese medicine, but PV, as one of the medicinal materials, plays an important role. It has been demonstrated that PV has an extensive range of pharmacological functions, consisting of anti-tumor, anti-inflammatory, antibacterial, and antiviral effects by modern pharmacological studies (Pan et al., 2022). Therefore, we speculate that the PV has a certain efficacy in anti-prolactinoma therapy but its key active components and targets are still unknown.

As a representative research field, network pharmacology mainly utilizes bioinformatics to reveal the potentially complex relationships between multicomponent and multitargets, and its significant advantages can be directly verified through experiments based on the results displayed on the network (Li et al., 2021; Nogales et al., 2022). Molecular docking is a simulation method to predict the binding mode of receptor and ligand by analyzing the properties and interaction of receptor-ligand by the electric field force (Pinzi & Rastelli, 2019). It is mainly used for drug design and discovery based on the structure of receptors and ligands. The goal of this exploration is to use cyberpharmacology and molecular docking to forecast the possible targets and pathways of the anti-prolactinoma effect of the PV, combined with in vitro experiments, to further investigate the targets of anti-prolactinoma and mechanisms of the PV.

Materials and Methods

Selection of Active Ingredients of the PV

The main active compounds of the PV were obtained by using the Traditional Chinese Medicine System pharmacology database and analysis platform (TCMSP; http://tcmspw.com/tcmsp.php; Ru et al., 2014; Tan et al., 2017). The pharmacokinetic process of ADME (absorption, distribution, metabolism, and excretion) is necessary for traditional Chinese medicine to exert its efficacy. Therefore, potential active substances were determined by oral bioavailability (OB) ≥ 30% and drug-likeness (DL) ≥ 0.18 (Su et al., 2007).

Acquisition of Candidate Targets

The screened active compounds were imported into the PubChem database (https://pubchem.ncbi.nlm.nih.gov/) to look up the SMILES number. Then, import them into the Swiss Target Prediction database (http://www.swisstargetprediction.ch), and the symbols of all the corresponding targets are obtained. Search for targets associated with prolactinoma with the keyword “prolactinoma” in the Genecards (https://www.genecards.org/; Tao et al., 2021). The core target between drug and disease was established by the VENN diagram.

Construction of the PV–Target–Prolactinoma Network

In this research, the network of the PV–target–prolactinoma was established by Cytoscape 3.8.0 software. Subsequently, the mechanism of the PV against prolactinoma was further analyzed.

The GO and KEGG Pathway Enrichment

The 21 key targets were put into DAVID 6.8 database (https://david.ncifcrf.gov/). The KEGG pathway and GO enrichment annotations are marked by “GENE OFFICIAL SYMBOL” and Homo sapiens. The top 20 correlative GO enrichment and top 10 correlative KEGG pathways were plotted into a bubble diagram.

Construction of the PPI Network of Core Target

The 21 key targets of PV against prolactinoma were put into the STRING database (https://string-db.org/), then set the species to Home sapiens and set the minimum required interaction score to “medium confidence (0.400)” to obtain a PPI network (Yuan et al., 2021). Import the TSV format of the PPI network into the Cytoscape 3.8.0 software. In topology analysis, the node value is usually greater than the median as a criterion for filtering the core target (Yuan et al., 2021).

Molecular Docking

In SYBYL-X 2.0 software, the binding ability of active substances to target proteins was assessed by Surflex-Dock module. Based on the PPI network and component–protein interactions, key components, and target protein molecules were selected for molecular docking. Download the construction of proteins directly from the PDB database, and modify it through SYBYL-X 2.0 software, including hydrogen addition, water removal, side chain repair, etc., to promote the reliability of molecular docking results (Feng et al., 2022). The 3D chemical structures of the active compositions were obtained from the PubChem database. A total score >7.0 indicates strong binding activity, a total score of 3.0–5.0 indicates moderate binding activity, and a total score of <3.0 indicates low binding activity (the lower the score, the lower the binding activity).

Drugs and Cell Culture

The PV(pharmaceutical batch number: 202208011) was supplied by Hubei Tianji Pharmaceutical Co. Ltd., and identified by Vice TCM Pharmacist Meng Junhua from Wuhan University Tongren Hospital. The PVE was extracted from 10 times the weight of the PV by refluxing water for 2 h and then condensed by evaporation. The following materials were occupied in this research: bromocriptine (Batch number: 35549; MedChem Express, New Jersey, USA). Rat prolactinoma tumor MMQ cell lines were suspended and cultured in DMEM (Gibco, Thermo Fisher Scientific, Inc.), medium containing 10% fetal bovine serum (FBS, Gibco, Thermo Fisher Scientific, Inc.) at 37℃, 5% CO₂ atmosphere. The cells were treated with the PVE (0, 40, 80, 160 µg/mL), bromocriptine for 48 h.

Cell Viability Assay

Cell viability was tested by a CCK-8 assay. Depending on the maker’s guidance, log-phase MMQ cells were collected and adjusted to 1×10⁵/mL. Different concentrations of the PVE (0, 40, 80, and 160 µg/mL) were individually added to each experimental group well. After being cultivated in an incubator for 48 h. The optical density values were tested at 450 nm. Then, calculate the cell survival rate and mortality rate.

Apoptosis Analysis

Apoptosis was detected by flow cytometry based on the manufacturer’s technical manuals. Cells were double-stained with PE Annexin V and 7-AAD for 15 min in the dark at room temperature and then analyzed by flow cytometry.

Western Blotting Analysis

Western blotting detected the expression of various proteins in the cells. At the end of the administration, the total protein of MMQ cells was extracted and its concentration was detected. The protein was separated and transferred to the polyvinylidene fluoride membrane by SDS-PAGE. The membrane is closed with 5% buttermilk at room temperature for 1 h, then incubated overnight in primary antibodies at 4°C. The antibodies used in this experiment were anti-BAX (1:2000); anti-ESR1 (1:2000); anti p-PI3K (1:2000); anti-mTOR (1:1000); anti p-AKT (1:1000); anti-MAPK3 (1:3000); anti p-AKT (1:2000); anti-PRL (1:6000); anti-Bcl-2 (1:2000), and cultured in secondary antibodies for 1h. The antibodies used were from Proteintech Co., Ltd. in China and Affinity in the USA. After elution, the TBST was exposed using electrochemical luminescence (ECL), and the gray values of the protein bands were determined by Image J.

Results

The PVE Repressed the Growth of MMQ Cells in vitro

The CCK-8 results have demonstrated that MMQ cell viability decreased significantly after 5, 10, 20, 40, 80, 160, and 320 µg/mL PVE treatment (Figure 1). The viability of MMQ cells treated for 48h with the 320 µg/mL PVE was 46.32%. Thus, the 40, 80, and 160 µg/mL PVE were selected for the subsequent experiment.

Figure 1.

Effects of the PVE on the Viability of MMQ Cells. After Treatment with the PVE for 48 h, the Viability of these Cells was Measured by CCK8 Assay. p <0.05, p < 0.01, and p <0.001 Vs. the Control Group.

Obtaining Active Compounds From the PV

The chemical composition database of the PV was built by exercising the TCMSP and PubChem databases. Finally, the 60 main components of PV were screened, and 11 active ingredients were obtained according to the values of OB ≥ 30% and DL ≥ 0.18, as shown in Table 1.

Table 1.

Active Ingredients of PV.

Mol ID	Molecular Weight	Molecule Name	OB (%)	DL
MOL000358	414.79	Beta-sitosterol	36.91	0.75
MOL000422	286.25	Kaempferol	41.88	0.24
MOL004355	412.77	Spinasterol	42.98	0.76
MOL000449	412.77	Stigmasterol	43.83	0.76
MOL004798	303.26	Delphinidin	40.63	0.28
MOL000006	286.25	Luteolin	36.16	0.25
MOL006767	339.34	Vulgaxanthin-I	56.14	0.26
MOL006772	412.77	Poriferasterol monoglucoside_qt	43.83	0.76
MOL006774	414.79	Stigmast-7-enol	37.42	0.75
MOL000737	302.25	Morin	46.23	0.27
MOL000098	302.25	Quercetin	46.43	0.28

Source: TCMSP (http://tcmspw.com/tcmsp.php).

Acquiring Intersection Targets

The 169 targets for the drug-active ingredients were gained through the PubChem database. Through the GeneCards database, 343 genes associated with prolactinoma were collected. The online mapping tool was used to import PV and prolactinoma-related targets, respectively, to draw the VENN diagram of drug-disease targets in Figure 2A, with a total of 21 intersection targets.

Figure 2.

VENN Diagram and the Enrichment Analysis of Candidate Genes and Signal Pathways. (A) VENN Diagram of Intersection Targets Between the PV and Prolactinoma. (B) Top 20 GO Enrichment Bubble Chart. (C) Top Nine KEGG Pathways Bubble Chart. The Size of Bubbles Grows as “Counts” Increase.

Target Biological Function Analysis of the PV in the Treatment of Prolactinoma

The GO function and KEGG pathway of 21 key anti-prolactinoma targets were implemented by operating the David database. By the GO function enrichment analysis (p <0.05), a total of 41 items were gained, which had a bearing on the biological functions of RNA polymerase II transcription factor activity, ligand-activated sequence-specific DNA binding RNA, steroid hormone receptor activity, enzyme binding. KEGG pathway enrichment analysis identified 9 signaling pathways (p <0.05), consisting of those pathways in cancer, estrogen signaling pathway, proteoglycans in cancer, bladder cancer, VEGF signaling pathway, prolactin signaling pathway, TNF signaling pathway endometrial cancer, and non-small cell lung cancer. The top 20 projects of GO and the top 9 signaling pathways are provided in Figure 2B and 2C.

The Network of PV–target–prolactinoma and PPI Network Establishment and Analysis

In Figure 3A, the 21 key targets were imported into the Cytoscape to visualize the “PV–target–prolactinoma” relationship network. In Figure 3A, the nodes have unlike shapes and colors where red represents the PV, purple represents prolactinoma, blue represents compounds and green represents the key targets. After the STRING database was integrated, input a PPI network into the Cytoscape 3.8.0 software for analysis. As shown in Figure 3B, the PTGS2 (degree = 16), AKT1 (degree = 15), ESR1 (degree = 15), MAPK3 (degree = 14), and EGFR (degree = 14)were all greater than the median degree (degree = 9) and ranked in the top 5. We initially believe that the PVE may mainly act on these targets to treat prolactinoma.

Figure 3.

PPI Network and the Connection Between Active Ingredients and Targets. (A) Network of the Relationship Between the PV–target–prolactinoma. The Red, Purple, Blue, and Green Nodes Represent the PV, Prolactinoma, Active Ingredients, and Targets, Respectively. (B) PPI Network of the PV Targets to Treat Prolactinoma.

Molecular Docking Verification

The binding sites and binding scores can directly image the stability and interactivity of the docking model. Here, we used the SYBYL-X 2.0 software to conduct molecular docking of key components through the network of PV–target–prolactinoma and PPI network analysis and established the docking models of AKT1 and ESR1 with kaempferol, quercetin, and luteolin, respectively, as shown in Figure 4. It was indicated that multi-docking scores are greater than 4, showing that the binding between the ligand and the receptor was greatly firm, as shown in Table 2.

Figure 4.

Molecular Docking Diagrams Between the Main Ingredients of the PV and the Core Targets. (A) Molecular Docking Between Kaempferol and AKT1. Kaempferol and Three Protein Residues (ALA9, ASP292, G LY294, and ASP292) in AKT1 Bonded to Each Other Through Hydrogen Bonds. (B) Molecular Docking Between Quercetin and AKT1. Quercetin and Four Protein Residues (THR195, ALA9, ASP292, and GLY294) in AKT1 Bonded to Each Other Through Hydrogen Bonds. (C) Molecular Docking Between Luteolin and AKT1. Luteolin and Four Protein Residues (GLU228, ALA230, LYS179, and ASP292) in AKT1 Bonded to Each Other Through Hydrogen Bonds. (D) Molecular Docking Between Kaempferol and ESR1. Kaempferol and Six Protein Residues (LEU346, ALA350, ARG394, LEU387, GLY521, and HIS524) in ESR1 Bonded to Each Other Through Hydrogen Bonds. (E) Molecular Docking Between Luteolin and ESR1. Luteolin and Four Protein Residues (GLU353, ARG394, LEU387, and HIS524) in ESR1 Bonded to Each Other Through Hydrogen Bonds.

Table 2.

Docking Score.

Key Ingredients	Total Score
Key Ingredients	AKT1	ESR1
Kaempferol	5.67	5.28
Quercetin	5.56	/
Luteolin	3.92	4.58

Source: Calculated from the SYBYL-X 2.0 Software.

The PI3K/AKT Signaling Pathway Took Part in the Suppression of the PVE on PRL Secretion

In this study, bromocriptine was used as the positive control group, which is a common drug for treating prolactinoma. After treatment with 40, 80, and 160 µg/mL PVE, the protein expression of ESR1, MAPK3, mTOR, p-ATK/AKT and PI3K significantly reduced in MMQ cells (p <0.05 or p <0.01) (Figure 5A–F). Meanwhile, the expression of PRL also decreased markedly (p <0.01) (Figure 5G). These findings suggested that the PVE could inhibit PRL expression by influencing the PI3K/AKT signaling pathway.

Figure 5.

Effects of the PVE on the PI3K, AKT, p-AKT, mTOR, MAPK3, ESR1, and PRL in MMQ Cells for 48 Hours. (A) Western Blotting Images. (B) Statistical Analysis of the Expression of the PI3K. (C) Statistical Analysis of the Expression of the p-AKT. (D) Statistical Analysis of the Expression of the mTOR. (E) Statistical Analysis of the Expression of the MAPK3. (F) Statistical Analysis of the Expression of ESR1. (G) Statistical Analysis of the Expression of the PRL. *p <0.05 and **p <0.01 Vs. the Control Group (n = 3).

The Pro-apoptotic Mechanism Fluences the Inhibitory Effects of the PVE on MMQ Cells

After treatment with 40, 80, and 160 µg/mL PVE for 48h, the apoptosis rate was checked. As a result, the 160 µg/mL PVE could trigger apoptosis in MMQ cells (Figure 6A). We discovered that the PVE lowered the expression of Bcl-2, but made no difference to the expression of BAX (Figure 6B).

Figure 6.

Effects of the PVE on the Bcl-2 and BAX in MMQ Cells for 48 Hours. (A) Apoptosis Rate of MMQ Cells Treated with the PVE (40, 80, and 160 µg/mL) was Detected by Annexin V-FITC and PI Double Staining. (B) Western Blotting Images and Analysis of the Bcl-2 and BAX Protein Expression After the PVE Treatment of MMQ Cells. *p <.05 and **p <0.01 Vs. the Control Group (n = 3).

Discussion

As one of the most effective choices of medicine, Chinese herbal medicine is also the most common medicine in China (Wang et al., 2018). The PVE has a good anti-cancer influence, which has further caught our attention to study (Wang et al., 2019; Zhang et al., 2020). Thus, the research plumbed the function and mechanism of the PVE on prolactinoma in MMQ cells. We utilized cyberpharmacology to explain the possible composition and action mechanism of the PVE. Finally, we successfully verified this through cell experiments. The results confirmed that the PVE may inhibit the proliferation of prolactinoma. The CCK-8 results suggested that the PVE had an anti-prolactinoma role. Interestingly, the ESR1, AKT1, and MAPK3 ranked among the top five in the analysis of cyberpharmacology. It was reported that the AKT and ESR1 inhibitors were often used to treat prolactinoma (Gao et al., 2017; Roof et al., 2018; Tang et al., 2019). This is consistent with our results and also validates the correctness of cyberpharmacology. Thus, the PVE might be an AKT or ESR1 inhibitor against prolactinoma. And we utilized the SYBYL-X 2.0 software to perform the molecular docking and described the probable binding sites of the PVE with relevant proteins. Therefore, elaborating on the ESR1 and AKT1 correlative pathways is consistent with our work objectives.

Estrogen plays a key role in the occurrence of prolactinoma, a possible mechanism is binding to the estrogen receptor, a nuclear steroid hormone receptor in the pituitary, consisting of Estrogen receptor α and Estrogen receptor β (Lv et al., 2012). ESR1, as one of the estrogen receptors, widely regulates various life activities. Estrogen could quickly and constantly activate membrane receptors through the PI3K/Akt and MAPK/ERK signaling pathways (Knowlton & Lee, 2012). Multiple reports have confirmed that the high expression of ESR1 could accelerate the occurrence of pituitary prolactinoma and kick start the progression of pituitary tumor (Delgrange et al., 2015). AKT1, as a member of AKT kinase, takes part in cellular progress, namely cell proliferation, apoptosis, and glucose metabolism. The PI3K/AKT pathway has formerly been reported to be connected with prolactinoma development (Dworakowska et al., 2009; Ferraris, 2022). It was shown that the PVE markedly suppressed the expression of AKT1 and Bcl-2/BAX protein. Thus, the PVE led to the apoptosis of MMQ cells by suppressing the PI3K/AKT1 pathway. Apoptosis, as one form of programmed cell death, refers to the orderly death of cells under the control of genes so as to hold a steady internal environment. A lot of natural drugs have been demonstrated to trigger apoptosis by intrinsic pathways (Xu et al., 2015). When the standards of oncogene signaling increase or DNA harm occurs, the inner pathway is induced, and the whole inner pathway is controlled by the Bcl-2 protein family. The Bcl-2 family contains both anti-apoptotic and pro-apoptotic proteins, which together adjust apoptosis. It was demonstrated that the PVE markedly decreased the expression of Bcl-2/BAX in MMQ cells. Consequently, the anti-prolactinoma effect of the PVE had a connection with apoptosis. Finally, it is not hard to show that PVE may be a potential candidate drug against prolactinoma. So, our work is meaningful.

Conclusion

In summary, utilizing cyberpharmacology, molecular docking, and cell experiments in vitro, our research revealed that the PVE decreased the expression of ESR1 and MAPK3, thereby inhibiting the PI3K/AKT pathway, causing the apoptosis of prolactinoma. However, due to the multi-ingredient and multitarget characteristics of the PV against prolactinoma, we intend to conduct more in-depth research on its material basis and other mechanisms and focus on the development of it as a drug preparation for treating prolactinoma in the future.

Footnotes

Abbreviations

AKT: RAC-alpha serine/threonine-protein kinase; BAX: Apoptosis regulator BAX; Bcl: Apoptosis regulator Bcl-2; GO: Gene ontology; KEGG: Kyoto encyclopedia of genes and genomes; MAPK3: Mitogen-activated protein kinase 3; mTOR: Serine/threonine-protein kinase; PI3K: Phosphatidylinositol 3-kinase; PPI: Protein–protein interaction; PRL: Prolactin.

Acknowledgements

The authors thank Yu Zhang for excellent technical support, Jun-hua Meng and Yong-gang Chen for critically reviewing the manuscript.

Author’s Contribution

HZ and PN: designed the research and completed the experiment. HZ and Y-C: drafted the manuscript, PN and YZ: consulted literature and completed data statistics. XW: assisted in solving the experimental challenges. JM and Y-C: were major contributors in reviewing the manuscript. JM, PN, and YC: contributed equally to this study, and are both listed as first authors. HZ and Y-C: are rightfully corresponding authors. All authors have read the final manuscript and approved of the submission.

Data Availability Statement

The data that support the findings of this study are available from the corresponding authors upon reasonable request.

Declaration of Conflicting Interests

The authors declared no potential conflicts of interest with respect to the research, authorship and/or publication of this article.

Funding

This work was supported by Hubei Provincial Central Guidance Local Science and Technology Development Project [grant number 2020ZYYD026], Major Projects in Wuhan (WZ21M03) and Wuhan Municipal Health Commission scientific research project [Grant number WZ22A01].

Statement of Informed Consent and Ethical Approval

All experiments were approved by the Ethics Committee of Tongren Hospital Affiliated to Wuhan University.

ORCID iD

Hong Zhang

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Network Pharmacology to Explore the Mechanism of Prunella vulgaris L. Against Prolactinoma

Abstract

Objectives

Materials and Methods

Results

Conclusion

Keywords

Introduction

Materials and Methods

Selection of Active Ingredients of the PV

Acquisition of Candidate Targets

Construction of the PV–Target–Prolactinoma Network

The GO and KEGG Pathway Enrichment

Construction of the PPI Network of Core Target

Molecular Docking

Drugs and Cell Culture

Cell Viability Assay

Apoptosis Analysis

Western Blotting Analysis

Results

The PVE Repressed the Growth of MMQ Cells in vitro

Effects of the PVE on the Viability of MMQ Cells. After Treatment with the PVE for 48 h, the Viability of these Cells was Measured by CCK8 Assay. *p <0.05, **p < 0.01, and ***p <0.001 Vs. the Control Group.

Obtaining Active Compounds From the PV

Active Ingredients of PV.

Acquiring Intersection Targets

VENN Diagram and the Enrichment Analysis of Candidate Genes and Signal Pathways. (A) VENN Diagram of Intersection Targets Between the PV and Prolactinoma. (B) Top 20 GO Enrichment Bubble Chart. (C) Top Nine KEGG Pathways Bubble Chart. The Size of Bubbles Grows as “Counts” Increase.

Target Biological Function Analysis of the PV in the Treatment of Prolactinoma

The Network of PV–target–prolactinoma and PPI Network Establishment and Analysis

Molecular Docking Verification

Docking Score.

The PI3K/AKT Signaling Pathway Took Part in the Suppression of the PVE on PRL Secretion

The Pro-apoptotic Mechanism Fluences the Inhibitory Effects of the PVE on MMQ Cells

Discussion

Conclusion

Footnotes

Abbreviations

Acknowledgements

Author’s Contribution

Data Availability Statement

Declaration of Conflicting Interests

Funding

Statement of Informed Consent and Ethical Approval

ORCID iD

References

Effects of the PVE on the Viability of MMQ Cells. After Treatment with the PVE for 48 h, the Viability of these Cells was Measured by CCK8 Assay. p <0.05, p < 0.01, and p <0.001 Vs. the Control Group.