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Nivedha J, Vennila L, Sindhu G, Kanimozhi K, Raj TC. Investigating the Anticancer Potential of Biochanin A in KB Oral Cancer Cells Through the NFκB Pathway. Cell Biochem Funct 2024; 42:e4130. [PMID: 39364853 DOI: 10.1002/cbf.4130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2024] [Revised: 08/28/2024] [Accepted: 09/18/2024] [Indexed: 10/05/2024]
Abstract
Squamous cell carcinoma (SCC) is a malignancy primarily affecting squamous cells. Its development is linked to multiple risk factors, such as alcohol and tobacco consumption, human papillomavirus (HPV) infection, and Epstein-Barr Virus (EBV) infection. Biochanin A (BCA), a phytoestrogen extracted from red clover, has been extensively researched for its therapeutic properties. It spans antioxidant activity, anti-inflammatory effects, neuroprotection, cardioprotection, and anticancer potential in different bodily systems. However, its impact on oral cancer remains unexplored. Therefore, this investigation aims to assess the potential anticancer effects of BCA, specifically on KB oral cancer cells. This study utilized KB cells to evaluate the impact of BCA on various cellular parameters, including cell viability, apoptosis, intracellular ROS production, mitochondrial membrane potential, and cell migration. BCA treatment induced several notable effects on KB cells, including reduced cell viability, altered morphology suggestive of apoptosis, heightened oxidative stress, and alterations in mitochondrial membrane potential. Moreover, BCA treatment demonstrated an inhibitory effect on cell migration. The study further investigated the impact of BCA on antioxidant enzyme activities and lipid peroxidation, revealing decreased antioxidant enzyme activities and increased lipid peroxidation across different BCA concentrations (IC50 and IC90). Immunocytochemistry and qRT-PCR analyses unveiled that BCA treatment at varying doses (IC50 and IC90) downregulated the expression of nuclear factor-κB (NF-κB) subunits p50 and p65, pivotal players in cancer progression. In summary, this study sheds light on the promising potential of BCA as an anticancer therapeutic agent for treating oral cancer. Its demonstrated ability to induce apoptosis, perturb cellular functions, and modulate gene expression within cancer cells underscores its significance. Nonetheless, further research, particularly following animal studies, is imperative to comprehensively grasp the breadth of BCA's effects and its viability for clinical applications.
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Affiliation(s)
- Jayaseelan Nivedha
- Department of Bio-Chemistry & Bio-technology, Annamalai University, Chidambaram, Tamil Nadu, India
| | - Lakshmanan Vennila
- Department of Bio-Chemistry & Bio-technology, Annamalai University, Chidambaram, Tamil Nadu, India
| | - Ganapathy Sindhu
- Department of Bio-Chemistry & Bio-technology, Annamalai University, Chidambaram, Tamil Nadu, India
- Department of Biochemistry, Government Arts College (Autonomous), Kumbakonam, Tamil Nadu, India
| | - Kaliyamoorthi Kanimozhi
- Department of Bio-Chemistry & Bio-technology, Annamalai University, Chidambaram, Tamil Nadu, India
| | - Tani Carmel Raj
- Department of Bio-Chemistry & Bio-technology, Annamalai University, Chidambaram, Tamil Nadu, India
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Frimpong E, Bulusu R, Okoro J, Inkoom A, Ndemazie N, Rogers S, Zhu X, Han B, Agyare E. Development of novel pyrimidine nucleoside analogs as potential anticancer agents: Synthesis, characterization, and In-vitro evaluation against pancreatic cancer. Eur J Pharm Sci 2024; 196:106754. [PMID: 38554983 PMCID: PMC11229414 DOI: 10.1016/j.ejps.2024.106754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 03/18/2024] [Accepted: 03/25/2024] [Indexed: 04/02/2024]
Abstract
The present study proposed modification of 5-FU by conjugation with an acyl chloride and a 5-membered heterocyclic ring to improve its in-vitro cytotoxicity and metabolic stability. XYZ-I-71 and XYZ-I-73 were synthesized by introducing a tetrahydrofuran ring on 5-fluorocytosine (a precursor of 5-FU) and conjugation with octanoyl chloride and lauroyl chloride, respectively. The structure of the synthesized compounds was validated using NMR and micro-elemental analysis. The antiproliferative activity of the analogs was determined against MiaPaCa-2, PANC-1, and BxPC-3 pancreatic cancer cells. The analog's stability in human liver microsomes was quantified by HPLC. We found that the XYZ-I-73 (IC50 3.6 ± 0.4 μM) analog was most effective against MiaPaCa-2 cells compared to XYZ-I-71(IC50 12.3 ± 1.7 μM), GemHCl (IC50 24.2 ± 1.3 μM), Irinotecan (IC50 10.1 ± 1.5 μM) and 5-FU (IC50 13.2 ± 1.1 μM). The antiproliferative effects of this analog in Miapaca-2 cells is evident based on it having a 7-fold,3-fold, and 4-fold increased cytotoxic effect over Gem-HCl, Irinotecan, and 5-FU, respectively. On the other hand, XYZ-I-71 exhibited a 2-fold increased cytotoxic effect over Gem-HCl but a comparable cytotoxic effect to 5-FU and Irinotecan in MiaPaCa-2 cells. A similar trend of higher XYZ-I-73 inhibition was observed in PANC-1 and BxPC-3 cultures. For 48-h MiaPaCa-2 cell migration studies, XYZ-I-73 (5 μM) significantly reduced migration (# of migrated cells, 168 ± 2.9), followed by XYZ-I-71(315±2.1), Gem-HCl (762±3.1) and 5-FU (710 ± 3.2). PARP absorbance studies demonstrated significant inhibition of PARP expression of XYZ-I-73 treated cells compared to 5-FU, GemHCl, and XYZ-I-71. Further, BAX and p53 expressions were significantly increased in cells treated with XYZ-I-73 compared to 5-FU, GemHCl, and XYZ-I-71. In-vitro, metabolic stability studies showed that 80 ± 5.9% of XYZ-I-71 and XYZ-I-73 remained intact after 2 h exposure in liver microsomal solution compared to 5-FU. The XYZ-I-73 analog demonstrated a remarkable cytotoxic effect and improved in-vitro metabolic stability over the selected standard drugs and may have potential anticancer activity against pancreatic cancer.
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Affiliation(s)
- Esther Frimpong
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Raviteja Bulusu
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Joy Okoro
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Andriana Inkoom
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Nkafu Ndemazie
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States; Department of Internal Medicine, Richmond University Medical Center, Staten Island, NY, United States
| | - Sherise Rogers
- Department of Medicine, Division of Hematology and Oncology, University of Florida College of Medicine, Gainesville, FL, United States
| | - Xue Zhu
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Bo Han
- Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Edward Agyare
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL, United States.
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3
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Tawfeeq N, Lazarte JMS, Jin Y, Gregory MD, Lamango NS. Polyisoprenylated cysteinyl amide inhibitors deplete singly polyisoprenylated monomeric G-proteins in lung and breast cancer cell lines. Oncotarget 2023; 14:243-257. [PMID: 36961909 PMCID: PMC10038354 DOI: 10.18632/oncotarget.28390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2023] Open
Abstract
Finding effective therapies against cancers driven by mutant and/or overexpressed hyperactive G-proteins remains an area of active research. Polyisoprenylated cysteinyl amide inhibitors (PCAIs) are agents that mimic the essential posttranslational modifications of G-proteins. It is hypothesized that PCAIs work as anticancer agents by disrupting polyisoprenylation-dependent functional interactions of the G-Proteins. This study tested this hypothesis by determining the effect of the PCAIs on the levels of RAS and related monomeric G-proteins. Following 48 h exposure, we found significant decreases in the levels of KRAS, RHOA, RAC1, and CDC42 ranging within 20-66% after NSL-YHJ-2-27 (5 μM) treatment in all four cell lines tested, A549, NCI-H1299, MDA-MB-231, and MDA-MB-468. However, no significant difference was observed on the G-protein, RAB5A. Interestingly, 38 and 44% decreases in the levels of the farnesylated and acylated NRAS were observed in the two breast cancer cell lines, MDA-MB-231, and MDA-MB-468, respectively, while HRAS levels showed a 36% decrease only in MDA-MB-468 cells. Moreover, after PCAIs treatment, migration, and invasion of A549 cells were inhibited by 72 and 70%, respectively while the levels of vinculin and fascin dropped by 33 and 43%, respectively. These findings implicate the potential role of PCAIs as anticancer agents through their direct interaction with monomeric G-proteins.
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Affiliation(s)
- Nada Tawfeeq
- Florida A&M University College of Pharmacy Pharmaceutical Sciences, Institute of Public Health, Tallahassee, FL 32307, USA
- Department of Pharmaceutical Chemistry, College of Clinical Pharmacy, Imam Abdulrahman bin Faisal University, Dammam, Eastern Province, Kingdom of Saudi Arabia
| | - Jassy Mary S Lazarte
- Florida A&M University College of Pharmacy Pharmaceutical Sciences, Institute of Public Health, Tallahassee, FL 32307, USA
| | - Yonghao Jin
- Florida A&M University College of Pharmacy Pharmaceutical Sciences, Institute of Public Health, Tallahassee, FL 32307, USA
| | - Matthew D Gregory
- Florida A&M University College of Pharmacy Pharmaceutical Sciences, Institute of Public Health, Tallahassee, FL 32307, USA
| | - Nazarius S Lamango
- Florida A&M University College of Pharmacy Pharmaceutical Sciences, Institute of Public Health, Tallahassee, FL 32307, USA
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Asong GM, Voshavar C, Amissah F, Bricker B, Lamango NS, Ablordeppey SY. An Evaluation of the Anticancer Properties of SYA014, a Homopiperazine-Oxime Analog of Haloperidol in Triple Negative Breast Cancer Cells. Cancers (Basel) 2022; 14:6047. [PMID: 36551533 PMCID: PMC9776707 DOI: 10.3390/cancers14246047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/02/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
Triple negative breast cancer (TNBC) is a type of breast cancer associated with early metastasis, poor prognosis, high relapse rates, and mortality. Previously, we demonstrated that SYA013, a selective σ2RL, could inhibit cell proliferation, suppress migration, reduce invasion, and induce mitochondria-mediated apoptosis in MDA-MB-231 cell lines, although we were unable to demonstrate the direct involvement of sigma receptors. This study aimed to determine the anticancer properties and mechanisms of action of SYA014, [4-(4-(4-chlorophenyl)-1,4-diazepan-1-yl)-1-(4-fluorophenyl)butan-1-one oxime], an oxime analogue of SYA013, the contribution of its sigma-2 receptor (σ2R) binding, and its possible synergistic use with cisplatin to improve anticancer properties in two TNBC cell lines, MDA-MB-231 (Caucasian) and MDA-MB-468 (Black). In the present investigation, we have shown that SYA014 displays anticancer properties against cell proliferation, survival, metastasis and apoptosis in the two TNBC cell lines. Furthermore, a mechanistic investigation was conducted to identify the apoptotic pathway by which SYA014 induces cell death in MDA-MB-231 cells. Since SYA014 has a higher binding affinity for σ2R compared to σ1R, we tested the role of σ2R on the antiproliferative property of SYA014 with a σ2R blockade. We also attempted to evaluate the combination effect of SYA014 with cisplatin in TNBC cells.
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Affiliation(s)
- Gladys M. Asong
- College of Pharmacy and Pharmaceutical Sciences, Institute of Public Health, Florida A&M University, Tallahassee, FL 32307, USA
| | - Chandrashekhar Voshavar
- College of Pharmacy and Pharmaceutical Sciences, Institute of Public Health, Florida A&M University, Tallahassee, FL 32307, USA
| | - Felix Amissah
- College of Pharmacy, Ferris State University, Big Rapids, MI 49307, USA
| | - Barbara Bricker
- College of Pharmacy and Pharmaceutical Sciences, Institute of Public Health, Florida A&M University, Tallahassee, FL 32307, USA
| | - Nazarius S. Lamango
- College of Pharmacy and Pharmaceutical Sciences, Institute of Public Health, Florida A&M University, Tallahassee, FL 32307, USA
| | - Seth Y. Ablordeppey
- College of Pharmacy and Pharmaceutical Sciences, Institute of Public Health, Florida A&M University, Tallahassee, FL 32307, USA
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5
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Wang C, Qu K, Wang J, Qin R, Li B, Qiu J, Wang G. Biomechanical regulation of planar cell polarity in endothelial cells. Biochim Biophys Acta Mol Basis Dis 2022; 1868:166495. [PMID: 35850177 DOI: 10.1016/j.bbadis.2022.166495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 07/09/2022] [Accepted: 07/11/2022] [Indexed: 01/03/2023]
Abstract
Cell polarity refers to the uneven distribution of certain cytoplasmic components in a cell with a spatial order. The planar cell polarity (PCP), the cell aligns perpendicular to the polar plane, in endothelial cells (ECs) has become a research hot spot. The planar polarity of ECs has a positive significance on the regulation of cardiovascular dysfunction, pathological angiogenesis, and ischemic stroke. The endothelial polarity is stimulated and regulated by biomechanical force. Mechanical stimuli promote endothelial polarization and make ECs produce PCP to maintain the normal physiological and biochemical functions. Here, we overview recent advances in understanding the interplay and mechanism between PCP and ECs function involved in mechanical forces, with a focus on PCP signaling pathways and organelles in regulating the polarity of ECs. And then showed the related diseases caused by ECs polarity dysfunction. This study provides new ideas and therapeutic targets for the treatment of endothelial PCP-related diseases.
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Affiliation(s)
- Caihong Wang
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, China
| | - Kai Qu
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, China
| | - Jing Wang
- Institute of Food and Nutrition Development, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Rui Qin
- College of Life Sciences, South-Central University for Nationalities, Wuhan, China
| | - Bingyi Li
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, China
| | - Juhui Qiu
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, China.
| | - Guixue Wang
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, China.
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Tawfeeq N, Jin Y, Lamango NS. Synthetic Optimization and MAPK Pathway Activation Anticancer Mechanism of Polyisoprenylated Cysteinyl Amide Inhibitors. Cancers (Basel) 2021; 13:cancers13225757. [PMID: 34830912 PMCID: PMC8616522 DOI: 10.3390/cancers13225757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/14/2021] [Accepted: 11/15/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary RAS G-protein genes are frequently mutated and drive the progression of about 30% of human cancers. Polyisoprenylated cysteinyl amide inhibitors (PCAIs) offer a novel approach to address the decades-long anti-RAS drug development challenge. This manuscript reports on the continuous development of the PCAIs and their anticancer molecular mechanisms that involve strong activation of MAP kinase pathway enzymes. Abstract Abnormalities of the MAPK pathway play vital roles in cancer initiation and progression. RAS GTPases that are key upstream mediators of the pathway are mutated in 30% of human cancers. Polyisoprenylated cysteinyl amide inhibitors (PCAIs) were designed as potential targeted therapies against the RAS-driven cancers. The current study reports on the optimization of the PCAIs and the determination of their mechanisms of action in KRAS-mutant cancer cells. They display ClogP values ranging from 3.01 to 6.35, suppressing the viabilities of KRAS-mutant MDA-MB-231, A549, MIA PaCa-2, and NCI-H1299 cells in 2D and 3D cultures with EC50 values of 2.2 to 6.8, 2.2 to 7.6, 2.3 to 6.5 and 5.0 to 14 µM, respectively. When A549 cells were treated with the PCAIs, NSL-YHJ-2-27, for 48 h, no significant difference was observed in the levels of total or phosphorylated B- and C-Raf proteins. However, at 5 µM, it stimulated the phosphorylation of MEK1/2, ERK1/2, and p90RSK by 84%, 59%, and 160%, respectively, relative to controls. A non-farnesylated analog, NSL-YHJ-2-62, did not elicit similar effects. These data reveal that effects on the RAS-MAPK signaling axis most likely contribute to the anticancer effects of the PCAIs, possibly through the proapoptotic isoforms of p90RSK. The PCAIs may thus have the potential to serve the unmet therapeutic needs of patients with aberrant hyperactive G-protein signaling.
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Lamango NS, Nkembo AT, Ntantie E, Tawfeeq N. Polyisoprenylated Cysteinyl Amide Inhibitors: A Novel Approach to Controlling Cancers with Hyperactive Growth Signaling. Curr Med Chem 2021; 28:3476-3489. [PMID: 33176634 PMCID: PMC9175089 DOI: 10.2174/0929867327666201111140825] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 09/18/2020] [Accepted: 09/25/2020] [Indexed: 11/22/2022]
Abstract
Aberrant activation of monomeric G-protein signaling pathways drives some of the most aggressive cancers. Suppressing these hyperactivities has been the focus of efforts to obtain targeted therapies. Polyisoprenylated methylated protein methyl esterase (PMPMEase) is overexpressed in various cancers. Its inhibition induces the death of cancer cells that harbor the constitutively active K-Ras proteins. Furthermore, the viability of cancer cells driven by factors upstream of K-Ras, such as overexpressed growth factors and their receptors or the mutationally-activated receptors, is also susceptible to PMPMEase inhibition. Polyisoprenylated cysteinyl amide inhibitors (PCAIs) were thus designed to target cancers with hyperactive signaling pathways involving the G-proteins. The PCAIs were, however, poor inhibitors of PMPMEase, with Ki values ranging from 3.7 to 20 μM. On the other hand, they inhibited cell viability, proliferation, colony formation, induced apoptosis in cells with mutant K-Ras and inhibited cell migration and invasion with EC50 values of 1 to 3 μM. HUVEC tube formation was inhibited at submicromolar concentrations through their disruption of actin filament organization. At the molecular level, the PCAIs at 2 to 5 μM depleted monomeric G-proteins such as K-Ras, RhoA, Cdc42 and Rac1. The PCAIs also deplete vinculin and fascin that are involved in actin organization and function while disrupting vinculin punctates in the process. These demonstrate a polyisoprenylation-dependent mechanism that explains the observed PCAIs' inhibition of the proliferative, invasive and angiogenic processes that promote both tumor growth and metastasis.
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Affiliation(s)
- Nazarius S. Lamango
- College of Pharmacy and Pharmaceutical Sciences Institute of Public Health, Florida A&M University, Tallahassee FL32307, USA
| | - Augustine T. Nkembo
- College of Pharmacy and Pharmaceutical Sciences Institute of Public Health, Florida A&M University, Tallahassee FL32307, USA
| | - Elizabeth Ntantie
- College of Pharmacy and Pharmaceutical Sciences Institute of Public Health, Florida A&M University, Tallahassee FL32307, USA
| | - Nada Tawfeeq
- College of Pharmacy and Pharmaceutical Sciences Institute of Public Health, Florida A&M University, Tallahassee FL32307, USA
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Asong G, Amissah F, Voshavar C, Nkembo AT, Ntantie E, Lamango NS, Ablordeppey SY. A Mechanistic Investigation on the Anticancer Properties of SYA013, a Homopiperazine Analogue of Haloperidol with Activity against Triple Negative Breast Cancer Cells. ACS OMEGA 2020; 5:32907-32918. [PMID: 33403252 PMCID: PMC7774091 DOI: 10.1021/acsomega.0c03495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 12/04/2020] [Indexed: 05/30/2023]
Abstract
Triple-negative breast cancer (TNBC) is one of the most malignant cancers associated with early metastasis, poor clinical prognosis, and high recurrence rate. TNBC is a distinct subtype of breast cancer that lacks estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor 2 receptors (HER2). Development of effective TNBC therapies has been limited partially due to the lack of specific molecular targets and chemotherapy involving different cytotoxic drugs suffers from significant side effects and drug-resistance development. Therefore, there is an unmet need for the development of novel and efficient therapeutic drugs with reduced side effects to treat TNBC. We have previously reported that certain analogues of haloperidol (a typical antipsychotic drug used for treating mental/mood disorders such as schizophrenia and bipolar disorder) suppress the viability of a variety of solid tumor cell lines, and we have identified 4-(4-(4-chlorophenyl)-1,4-diazepan-1-yl)-1-(4-fluoro-phenyl)butan-1-one (SYA013) with such antiproliferative properties. Interestingly, unlike haloperidol, SYA013 shows moderate selectivity toward σ2 receptors. In this study, we explored the potential of SYA013 in modulating the important biological events associated with cell survival and progression as well as the mechanistic aspects of apoptosis in a representative TNBC cell line (MDA-MB-231). Our results indicate that SYA013 inhibits the proliferation of MDA-MB-231 cells in a concentration-dependent manner and suppresses cell migration and invasion. Apoptotic studies were also conducted in MDA-MB-468 cells (cells derived from a 51-year old Black female with metastatic adenocarcinoma of the breast.). In addition, we have demonstrated that SYA013 induces MDA-MB-231 cell death through the intrinsic apoptotic pathway and may suppress tumor progression and metastasis. Taken together, our study presents a mechanistic pathway of the anticancer properties of SYA013 against TNBC cell lines and suggests a potential for exploring SYA013 as a lead agent for development against TNBC.
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Affiliation(s)
- Gladys
M. Asong
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Felix Amissah
- College
of Pharmacy, Ferris State University, Big Rapids, Michigan 49307, United States
| | - Chandrashekhar Voshavar
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Augustine T. Nkembo
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Elizabeth Ntantie
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Nazarius S. Lamango
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
| | - Seth Y. Ablordeppey
- College
of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, Florida 32307, United States
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Zhang Z, Nong L, Chen M, Gu X, Zhao W, Liu M, Cheng W. Baicalein suppresses vasculogenic mimicry through inhibiting RhoA/ROCK expression in lung cancer A549 cell line. Acta Biochim Biophys Sin (Shanghai) 2020; 52:1007-1015. [PMID: 32672788 DOI: 10.1093/abbs/gmaa075] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/06/2020] [Accepted: 03/09/2020] [Indexed: 12/19/2022] Open
Abstract
Vasculogenic mimicry (VM) refers to a new tubular network of the blood supply system with abundant extracellular matrix. VM is similar to capillaries but does not involve endothelial cells. As a traditional herbal medicine commonly used in China, baicalein possesses anti-inflammatory and lipoxygenase activities. However, the effects of baicalein on the process of VM formation in non-small cell lung cancer (NSCLC) and the underlying mechanisms have remained poorly understood. In this study, baicalein was found to inhibit the viability and motility of A549 cells and induced the breakage of the cytoskeletal actin filament network. In addition, baicalein significantly decreased the formation of VM and downregulated the expressions of VM-associated factors, such as VE-cadherin, EphA2, MMP14, MMP2, MMP9, PI3K and LAMC2, similar to the effects of ROCK inhibitors. Indeed, baicalein inhibited RhoA/ROCK expression in vitro and in vivo, suggesting the underlying mechanisms of reduced VM formation. Collectively, baicalein suppressed the formation of VM in NSCLC by targeting the RhoA/ROCK signaling pathway, indicating that baicalein might serve as an emerging drug for NSCLC.
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Affiliation(s)
- Zhe Zhang
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
| | - Li Nong
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Menglei Chen
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
| | - Xiaoli Gu
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
| | - Weiwei Zhao
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
| | - Minghui Liu
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
| | - Wenwu Cheng
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China, and
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10
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Nkembo AT, Amissah F, Ntantie E, Poku RA, Salako OO, Ikpatt OF, Lamango NS. Polyisoprenylated Cysteinyl Amide Inhibitors Deplete K-Ras and Induce Caspase-dependent Apoptosis in Lung Cancer Cells. Curr Cancer Drug Targets 2020; 19:838-851. [PMID: 30914025 DOI: 10.2174/1568009619666190325144636] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 03/01/2019] [Accepted: 03/10/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND Non-small cell lung cancers (NSCLC) harboring mutation-induced dysregulation of Ras signaling present some of the most difficult-to-manage cases, since directly targeting the constitutively active mutant Ras proteins has not resulted in clinically useful drugs. Therefore, modulating Ras activity for targeted treatment of cancer remains an urgent healthcare need. OBJECTIVE In the current study, we investigated a novel class of compounds, the polyisoprenylated cysteinyl amide inhibitors (PCAIs), for their anticancer molecular mechanisms using the NSCLC cell panel with K-Ras and/or other mutant genes. METHODS The effect of the PCAIs on intracellular K-Ras levels, cell viability, apoptosis, spheroid and colony formation were determined. RESULTS Treatment of the lung cancer cells with the PCAIs, NSL-RD-035, NSL-BA-036, NSL-BA- 040 and NSL-BA-055 resulted in concentration-dependent cell death in both K-Ras mutant (A549, NCI-H460, and NCI-H1573), N-Ras mutant (NCI-H1299) and other (NCI-H661, NCI-H1975, NCIH1563) NSCLC cells. The PCAIs at 1.0 -10 μM induced the degeneration of 3D spheroid cultures, inhibited clonogenic cell growth and induced marked apoptosis via the extrinsic pathway. The most potent of the PCAIs, NSL-BA-055, at 5 μM induced a seven-fold increase in the activity of caspase- 3/7 and a 75% selective depletion of K-Ras protein levels relative to GAPDH in A549 cells that correlated with PCAIs-induced apoptosis. NSL-BA-040 and NSL-BA-055 also induced the phosphorylation of MAP kinase (ERK 1/2). CONCLUSION Taken together, PCAIs may be potentially useful as targeted therapies that suppress NSCLC progression through disruption of Ras-mediated growth signaling.
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Affiliation(s)
- Augustine T Nkembo
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
| | - Felix Amissah
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
| | - Elizabeth Ntantie
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
| | - Rosemary A Poku
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
| | - Olufisayo O Salako
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
| | - Offiong Francis Ikpatt
- Department of Pathology, School of Medicine, University of Miami, Miami, FL, 33136, United States
| | - Nazarius S Lamango
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, United States
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11
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Abdelkarim H, Banerjee A, Grudzien P, Leschinsky N, Abushaer M, Gaponenko V. The Hypervariable Region of K-Ras4B Governs Molecular Recognition and Function. Int J Mol Sci 2019; 20:ijms20225718. [PMID: 31739603 PMCID: PMC6888304 DOI: 10.3390/ijms20225718] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/09/2019] [Accepted: 11/11/2019] [Indexed: 12/25/2022] Open
Abstract
The flexible C-terminal hypervariable region distinguishes K-Ras4B, an important proto-oncogenic GTPase, from other Ras GTPases. This unique lysine-rich portion of the protein harbors sites for post-translational modification, including cysteine prenylation, carboxymethylation, phosphorylation, and likely many others. The functions of the hypervariable region are diverse, ranging from anchoring K-Ras4B at the plasma membrane to sampling potentially auto-inhibitory binding sites in its GTPase domain and participating in isoform-specific protein-protein interactions and signaling. Despite much research, there are still many questions about the hypervariable region of K-Ras4B. For example, mechanistic details of its interaction with plasma membrane lipids and with the GTPase domain require further clarification. The roles of the hypervariable region in K-Ras4B-specific protein-protein interactions and signaling are incompletely defined. It is also unclear why post-translational modifications frequently found in protein polylysine domains, such as acetylation, glycation, and carbamoylation, have not been observed in K-Ras4B. Expanding knowledge of the hypervariable region will likely drive the development of novel highly-efficient and selective inhibitors of K-Ras4B that are urgently needed by cancer patients.
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Affiliation(s)
- Hazem Abdelkarim
- Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago (UIC), Chicago, IL 60607, USA; (H.A.); (P.G.); (N.L.); (M.A.)
| | - Avik Banerjee
- Department of Chemistry, University of Illinois at Chicago (UIC), Chicago, IL 60612, USA;
| | - Patrick Grudzien
- Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago (UIC), Chicago, IL 60607, USA; (H.A.); (P.G.); (N.L.); (M.A.)
| | - Nicholas Leschinsky
- Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago (UIC), Chicago, IL 60607, USA; (H.A.); (P.G.); (N.L.); (M.A.)
| | - Mahmoud Abushaer
- Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago (UIC), Chicago, IL 60607, USA; (H.A.); (P.G.); (N.L.); (M.A.)
| | - Vadim Gaponenko
- Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago (UIC), Chicago, IL 60607, USA; (H.A.); (P.G.); (N.L.); (M.A.)
- Correspondence: ; Tel.: +312-355-4839
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12
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Li Y, Gu J, Xu F, Zhu Q, Ge D, Lu C. Novel methylation-driven genes identified as prognostic indicators for lung squamous cell carcinoma. Am J Transl Res 2019; 11:1997-2012. [PMID: 31105813 PMCID: PMC6511754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 01/28/2019] [Indexed: 06/09/2023]
Abstract
Lung cancer remains the leading cause of cancer death. DNA methylation plays an essential role in carcinogenesis through regulating gene expression and gene alternative splicing. However, the role of methylation in the tumorigenesis of lung squamous cell carcinoma (SCC) and its association with prognosis remains unclear. Here, we used an integrative approach to evaluate the prognostic value of epigenetic processes in lung SCC by examining the data provided by The Cancer Genome Atlas (TCGA). We found that the mean methylation level was significantly decreased in lung SCC. We also identified methylation-driven genes which were associated with cancer-related pathways. The multivariate Cox regression analysis showed four methylation-driven genes, GCSAM, GPR75, NHLRC1, and TRIM58, could be served as prognostic indicators for lung SCC. Validation on two external GEO datasets showed consistent methylation alterations of the four genes. These findings may have important implications in the understanding of the potential therapeutic method for lung SCC.
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Affiliation(s)
- Yin Li
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
| | - Jie Gu
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
| | - Fengkai Xu
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
| | - Qiaoliang Zhu
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
| | - Di Ge
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
| | - Chunlai Lu
- Department of Thoracic Surgery, Zhongshan Hospital, Fudan University Shanghai, P. R. China
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Zeng J, Xie S, Liu Y, Shen C, Song X, Zhou GL, Wang C. CDK5 Functions as a Tumor Promoter in Human Lung Cancer. J Cancer 2018; 9:3950-3961. [PMID: 30410599 PMCID: PMC6218768 DOI: 10.7150/jca.25967] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 08/19/2018] [Indexed: 12/12/2022] Open
Abstract
Cyclin-dependent kinase 5 (CDK5), an atypical member of the cyclin-dependent kinase family, plays an important role in the nervous system. Recent studies have shown that CDK5 is also associated with tumors. However, few studies have been done to investigate the mechanism underlying the connection between CDK5 and cancers. To explore the role of CDK5 in cancers by using an extensive bioinformatics data mining process. We mined the transcriptional, survival, functions and structure of CDK5 gene through databases and in vitro experiments. We found that higher CDK5 expression levels in most cancer cell lines while lower expression in liver and brain cancer cell lines. High expression of CDK5 was associated with shorter overall survival (OS) in lung cancer. In addition, high expression level of CDK5 promoted lung cancer cells proliferation and metastasis. Inhibited CDK5 decreases CAP1 phosphorylation. CDK5 may prove to be a valid target of anticancer therapies.
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Affiliation(s)
- Jie Zeng
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
| | - Shuanshuan Xie
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
| | - Yang Liu
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
| | - Changxing Shen
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
| | - Xiaolian Song
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
| | - Guo-Lei Zhou
- Department of Biological Sciences, Arkansas State University, State University, AR 72467, USA.,Molecular Biosciences Program, Arkansas State University, State University, AR 72467, USA
| | - Changhui Wang
- Department of Respiratory Medicine, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, PR China
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14
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Qin Y, Chen K, Gu W, Dong X, Lei R, Chang Y, Bai X, Xia S, Zeng L, Zhang J, Ma S, Li J, Li S, Xing G. Small size fullerenol nanoparticles suppress lung metastasis of breast cancer cell by disrupting actin dynamics. J Nanobiotechnology 2018; 16:54. [PMID: 29935539 PMCID: PMC6015447 DOI: 10.1186/s12951-018-0380-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 06/14/2018] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Tumor metastasis is the primary cause of mortality in cancer patients. Migratory breast cancer cells in lymphatic and blood vessels seek new sites and form metastatic colonies in the lung and bone, and then these cancer cells often wreak considerable havoc. With advances in nanotechnology, nanomaterials and nanotechnologies are widely applied in tumor therapy. In this paper, small size fullerenol nanoparticles, which are separated by isoelectric focusing electrophoresis (IFE) for discrepancy of isoelectric point (pI), are used in the study of tumor metastasis. RESULTS In this study, the commendable inhibition of tumor metastasis was uncovered by intravenous injection of purified fullerenol fraction with special surface charge and functional groups, which was separated by IFE for discrepancy of pI. By investigating the actin dynamics in several cancer cell lines, we found these small size fullerenol nanoparticles disturbed actin dynamics. Young's modulus detection and cell migration assays revealed that fullerenol lowered stiffness and restrained migration of breast cancer cells. Filopodia, the main supporting structures of actin bundles, are important for cell motility and adhesion. Scanning electron microscopy showed that fullerenol reduced the number and length of filopodia. Simultaneously, the inhibition of integrin to form clusters on filopodias, which was likely induced by reorganizing of actin cytoskeleton, impacted cancer cell adhesion and motility. CONCLUSIONS With intravenous injection of these fullerenol nanoparticles, tumor metastasis is well inhibited in vivo. The underlying mechanism most likely to be attributed to the effect of fullerenol nanoparticles on disturbing actin dynamics. With the disordered actin fiber, cell function is varied, including decreased cell stiffness, reduced filopodia formation, and inactivated integrin.
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Affiliation(s)
- Yanxia Qin
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006 China
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Kui Chen
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Weihong Gu
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Xinghua Dong
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Ruihong Lei
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Yanan Chang
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Xue Bai
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Shibo Xia
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Li Zeng
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Jiaxin Zhang
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
- University of Chinese Academy of Sciences, Beijing, 100049 People’s Republic of China
| | - Sihan Ma
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Juan Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
| | - Shan Li
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006 China
| | - Gengmei Xing
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
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15
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Ntantie E, Allen MJ, Fletcher J, Nkembo AT, Lamango NS, Ikpatt OF. Suppression of focal adhesion formation may account for the suppression of cell migration, invasion and growth of non-small cell lung cancer cells following treatment with polyisoprenylated cysteinyl amide inhibitors. Oncotarget 2018; 9:25781-25795. [PMID: 29899821 PMCID: PMC5995249 DOI: 10.18632/oncotarget.25372] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 04/21/2018] [Indexed: 12/27/2022] Open
Abstract
Migratory cells form extracellular matrix attachments called focal-adhesions. Focal adhesion assembly and disassembly are regulated by the Rho family of small GTPases. We previously reported that polyisoprenylated cysteinyl amide inhibitors (PCAIs) suppress Rho protein levels, disrupting F-actin cytoskeleton remodeling in the formation of lamellipodia and filopodia. In this study, we investigated whether these observations effect focal adhesion formation, which involves cell surface receptors known as integrins and several signaling/adaptor proteins such as vinculin, α-actinin, Rock kinases and phospho-Myosin Light Chain-2 (p-MLC-2), that foster the linkage of the actin cytoskeleton to the extracellular matrix. We observed that treatment of H1299 cells with 5 μM PCAIs for 24 h markedly diminished the level of full-length integrin α4 by at least 24% relative to controls. PCAIs at 5 μM, diminished the levels of vinculin by at least 50%. Immunofluorescent analysis showed at least a 76% decrease in the number of vinculin-focal adhesion punctates. In addition, PCAIs diminished Rock1 levels by 25% and its substrate, p-MLC-2 by 75%. PCAIs did not significantly alter the levels of integrin β5, α-actinin, and Rock2, suggesting that the effects of the PCAIs are target specific. Our data indicate that the PCAIs alter the levels of the Rho proteins and their effectors to abrogate their functions in cytoskeleton remodeling thereby suppressing focal adhesion formation. This in turn results in a PCAIs-induced decrease in cell invasion, thus making the PCAIs propitious agents for the inhibition of cancer growth and metastasis.
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Affiliation(s)
- Elizabeth Ntantie
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Michaela J. Allen
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Jerrine Fletcher
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Augustine T. Nkembo
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Nazarius S. Lamango
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Offiong F. Ikpatt
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
- Department of Pathology, University of Miami, Coral Gables, FL 33027, USA
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16
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Abstract
Background Like many members of the Enterobacteriaceae family, Yersinia ruckeri has the ability to invade non professional phagocytic cells. Intracellular location is advantageous for the bacterium because it shields it from the immune system and can help it cross epithelial membranes and gain entry into the host. In the present manuscript, we report on our investigation regarding the mechanisms of Y. ruckeri’s invasion of host cells. Results A gentamycin assay was applied to two isolates, belonging to both the biotype 1 (ATCC 29473) and biotype 2 (A7959–11) and using several cell culture types: Atlantic Salmon Kidney, Salmon Head Kidney and, Chinook salmon embryos cells at both low and high passage numbers. Varying degrees of sensitivity to Y. ruckeri infection were found between the cell types and the biotype 1 strain was found to be more invasive than the non-motile biotype 2 isolate. Furthermore, the effect of six chemical compounds (Cytochalasin D, TAE 226, vinblastine, genistein, colchicine and, N-acetylcysteine), known to interfere with bacterial invasion strategies, were investigated. All of these compounds had a significant impact on the ability of the bacterium to invade host cells. Changes in the concentration of bacterial cells over time were investigated and the results suggested that neither isolate could survive intracellularly for sustained periods. Conclusions These results suggest that Y. ruckeri can gain entrance into host cells through several mechanisms, and might take advantage of both the actin and microtubule cytoskeletal systems.
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