1
|
Lee GE, Bang G, Byun J, Lee CJ, Chen W, Jeung D, An HJ, Kang HC, Lee JY, Lee HS, Hong YS, Kim DJ, Keniry M, Kim JY, Choi JS, Fanto M, Cho SJ, Kim KD, Cho YY. Dysregulated CREB3 cleavage at the nuclear membrane induces karyoptosis-mediated cell death. Exp Mol Med 2024; 56:686-699. [PMID: 38480902 PMCID: PMC10985101 DOI: 10.1038/s12276-024-01195-1] [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: 09/01/2023] [Revised: 12/17/2023] [Accepted: 01/02/2024] [Indexed: 04/04/2024] Open
Abstract
Cancer cells often exhibit resistance to apoptotic cell death, but they may be vulnerable to other types of cell death. Elucidating additional mechanisms that govern cancer cell death is crucial for developing new therapies. Our research identified cyclic AMP-responsive element-binding protein 3 (CREB3) as a crucial regulator and initiator of a unique cell death mechanism known as karyoptosis. This process is characterized by nuclear shrinkage, deformation, and the loss of nuclear components following nuclear membrane rupture. We found that the N-terminal domain (aa 1-230) of full-length CREB3 (CREB3-FL), which is anchored to the nuclear inner membrane (INM), interacts with lamins and chromatin DNA. This interaction maintains a balance between the outward force exerted by tightly packed DNA and the inward constraining force, thereby preserving INM integrity. Under endoplasmic reticulum (ER) stress, aberrant cleavage of CREB3-FL at the INM leads to abnormal accumulation of the cleaved form of CREB3 (CREB3-CF). This accumulation disrupts the attachment of CREB3-FL to the INM, resulting in sudden rupture of the nuclear membrane and the onset of karyoptosis. Proteomic studies revealed that CREB3-CF overexpression induces a DNA damage response akin to that caused by UVB irradiation, which is associated with cellular senescence in cancer cells. These findings demonstrated that the dysregulation of CREB3-FL cleavage is a key factor in karyoptotic cell death. Consequently, these findings suggest new therapeutic strategies in cancer treatment that exploit the process of karyoptosis.
Collapse
Affiliation(s)
- Ga-Eun Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Geul Bang
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Ochang, Cheongju-si, Chungbuk, 28119, Republic of Korea
| | - Jiin Byun
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Cheol-Jung Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- Research Center for Materials Analysis, Korea Basic Science Institute, Daejeon, 34133, Republic of Korea
| | - Weidong Chen
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Dohyun Jeung
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Hyun-Jung An
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Han Chang Kang
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Joo Young Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Hye Suk Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Young-Soo Hong
- Anticancer Agent Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju-si, Chungbuk, 28116, Republic of Korea
| | - Dae Joon Kim
- Department of Immunology and Microbiology, School of Medicine, University of Texas Rio Grande Valley, Edinburg, TX, 78504, USA
| | - Megan Keniry
- Department of Biology, University of Texas Rio Grande Valley, Edinburg, TX, 78539, USA
| | - Jin Young Kim
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Ochang, Cheongju-si, Chungbuk, 28119, Republic of Korea
| | - Jin-Sung Choi
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea
| | - Manolis Fanto
- Department of Basic and Clinical Neuroscience, King's College London, Maurice Wohl Clinical Neuroscience Institute, London, UK
| | - Sung-Jun Cho
- University of Minnesota, Department of Medicine, 420 Delaware St SE, MMC 284, Minneapolis, MN, 55455, USA
| | - Kwang-Dong Kim
- Division of Applied Life Science (BK21 four), PMBBRC, Gyeongsang National University, Jinju, 52828, Korea
| | - Yong-Yeon Cho
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea.
- BK21-4th, and RCD Control∙Material Research Institute, College of Pharmacy, The Catholic University of Korea, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea.
| |
Collapse
|
2
|
Han N, Zhang Q, Tang X, Bai L, Yan L, Tang H. Hepatitis B Virus X Protein Modulates p90 Ribosomal S6 Kinase 2 by ERK to Promote Growth of Hepatoma Cells. Viruses 2023; 15:v15051182. [PMID: 37243268 DOI: 10.3390/v15051182] [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: 04/17/2023] [Revised: 05/10/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Hepatitis B virus (HBV) infection is a leading cause of hepatocellular carcinoma (HCC), one of the most prevalent malignant tumors worldwide that poses a significant threat to human health. The multifunctional regulator known as Hepatitis B virus X-protein (HBx) interacts with host factors, modulating gene transcription and signaling pathways and contributing to hepatocellular carcinogenesis. The p90 ribosomal S6 kinase 2 (RSK2) is a member of the 90 kDa ribosomal S6 kinase family involved in various intracellular processes and cancer pathogenesis. At present, the role and mechanism of RSK2 in the development of HBx-induced HCC are not yet clear. In this study, we found that HBx upregulates the expression of RSK2 in HBV-HCC tissues, HepG2, and SMMC-7721 cells. We further observed that reducing the expression of RSK2 inhibited HCC cell proliferation. In HCC cell lines with stable HBx expression, RSK2 knockdown impaired the ability of HBx to promote cell proliferation. The extracellularly regulated protein kinases (ERK) 1/2 signaling pathway, rather than the p38 signaling pathway, mediated HBx-induced upregulation of RSK2 expression. Additionally, RSK2 and cyclic adenosine monophosphate (cAMP) response element binding protein (CREB) were highly expressed and positively correlated in HBV-HCC tissues and associated with tumor size. This study showed that HBx upregulates the expression of RSK2 and CREB by activating the ERK1/2 signaling pathway, promoting the proliferation of HCC cells. Furthermore, we identified RSK2 and CREB as potential prognostic markers for HCC patients.
Collapse
Affiliation(s)
- Ning Han
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Disease, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Qingbo Zhang
- Jiangxi Qiushi Forensic Science Center, Nanchang 330096, China
| | - Xiaoqiong Tang
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Disease, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Lang Bai
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Disease, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Libo Yan
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Disease, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Hong Tang
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Disease, West China Hospital, Sichuan University, Chengdu 610041, China
| |
Collapse
|
3
|
Seo YH, Kim JY, Ryu SM, Hwang SY, Lee MH, Kim N, Son H, Lee AY, Kim HS, Moon BC, Jang DS, Lee J. New Sesquiterpene Glycosides from the Flowers of Aster koraiensis and Their Inhibition Activities on EGF- and TPA-Induced Cell Transformation. PLANTS (BASEL, SWITZERLAND) 2023; 12:1726. [PMID: 37111949 PMCID: PMC10146194 DOI: 10.3390/plants12081726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/07/2023] [Accepted: 04/18/2023] [Indexed: 06/19/2023]
Abstract
In total, four new eudesmane-type sesquiterpene glycosides, askoseosides A-D (1-4), and 18 known compounds (5-22) were isolated from the flowers of Aster koraiensis via chromatographic techniques. Chemical structures of the isolated compounds were identified by spectroscopic/spectrometric methods, including NMR and HRESIMS, and the absolute configuration of the new compounds (1 and 2) was performed by electronic circular dichroism (ECD) studies. Further, the anticancer activities of the isolated compounds (1-22) were evaluated using the epidermal growth factor (EGF)-induced as well as the 12-O-tetradecanoylphorbol 13-acetate (TPA)-induced cell transformation assay. Among the 22 compounds, compounds 4, 9, 11, 13-15, 17, 18, and 22 significantly inhibited both EGF- and TPA-induced colony growth. In particular, askoseoside D (4, EGF: 57.8%; TPA: 67.1%), apigenin (9, EGF: 88.6%; TPA: 80.2%), apigenin-7-O-β-d-glucuronopyranoside (14, EGF: 79.2%; TPA: 70.7%), and 1-(3',4'-dihydroxycinnamoyl) cyclopentane-2,3-diol (22, EGF: 60.0%; TPA: 72.1%) showed higher potent activities.
Collapse
Affiliation(s)
- Young-Hye Seo
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| | - Ji-Young Kim
- Department of Biomedical and Pharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Seung-Mok Ryu
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| | - Sun-Young Hwang
- College of Korean Medicine, Dongshin University, Naju 58245, Republic of Korea
| | - Mee-Hyun Lee
- College of Korean Medicine, Dongshin University, Naju 58245, Republic of Korea
| | - Nahyun Kim
- Division of Forest Industrial Materials, Department of Forest Products and Industry, National Institute of Forest Science, Seoul 02455, Republic of Korea
| | - Hojun Son
- Forest Medicinal Resources Research Center, National Institute of Forest Science, Yeongju 36040, Republic of Korea
| | - A-Yeong Lee
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| | - Hyo-Seon Kim
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| | - Byeong-Cheol Moon
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| | - Dae-Sik Jang
- Department of Biomedical and Pharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jun Lee
- Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine (KIOM), Naju 58245, Republic of Korea
| |
Collapse
|
4
|
Lucia Ruiz Benitez M, Severo Sabedra Sousa F, Peter Furtado I, Carlos Rodrigues Junior J, Victoria Mascarenhas Borba M, Vieira Segatto N, Tabarelli G, Klein Couto G, Júlia Damé Fonseca Paschoal M, Silveira Pacheco B, E. D. Rodrigues O, Collares T, Kömmling Seixas F. Chiral β‐arylchalcogenium azide induce apoptosis and regulate Oxidative Damage on Human Bladder Cancer Cells. ChemistrySelect 2022. [DOI: 10.1002/slct.202203207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Martha Lucia Ruiz Benitez
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
- School of Basic and Biomedical Sciences Universidad Simón Bolívar Barranquilla Colombia
| | - Fernanda Severo Sabedra Sousa
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Izadora Peter Furtado
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - João Carlos Rodrigues Junior
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Msc. Victoria Mascarenhas Borba
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Natália Vieira Segatto
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Greice Tabarelli
- LabSelen-NanoBio - Chemistry Department Federal University of Santa Maria, Santa Maria Rio Grande do Sul Brazil
| | - Gabriela Klein Couto
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Msc. Júlia Damé Fonseca Paschoal
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Bruna Silveira Pacheco
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Oscar E. D. Rodrigues
- LabSelen-NanoBio - Chemistry Department Federal University of Santa Maria, Santa Maria Rio Grande do Sul Brazil
| | - Tiago Collares
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| | - Fabiana Kömmling Seixas
- Laboratory of Cancer Biotechnology, Technology Development Center Federal University of Pelotas Pelotas Rio Grande do Sul Brazil
| |
Collapse
|
5
|
Wu HZ, Li LY, Jiang SL, Li YZ, Shi XM, Sun XY, Li Z, Cheng Y. RSK2 promotes melanoma cell proliferation and vemurafenib resistance via upregulating cyclin D1. Front Pharmacol 2022; 13:950571. [PMID: 36210843 PMCID: PMC9541206 DOI: 10.3389/fphar.2022.950571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 07/06/2022] [Indexed: 11/17/2022] Open
Abstract
BRAF inhibitors are commonly used in targeted therapies for melanoma patients harboring BRAFV600E mutant. Despite the benefit of vemurafenib therapy, acquired resistance during or after treatment remains a major obstacle in BRAFV600E mutant melanoma. Here we found that RSK2 is overexpressed in melanoma cells and the high expression of RSK2 indicates poor overall survival (OS) in melanoma patients. Overexpression of RSK2 leads to vemurafenib resistance, and the deletion of RSK2 inhibits cell proliferation and sensitizes melanoma cells to vemurafenib. Mechanistically, RSK2 enhances the phosphorylation of FOXO1 by interacting with FOXO1 and promoting its subsequent degradation, leading to upregulation of cyclin D1 in melanoma cells. These results not only reveal the presence of a RSK2-FOXO1-cyclin D1 signaling pathway in melanoma, but also provide a potential therapeutic strategy to enhance the efficacy of vemurafenib against cancer.
Collapse
Affiliation(s)
- Hai-Zhou Wu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Lan-Ya Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Shi-Long Jiang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yi-Zhi Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
| | - Xiao-Mei Shi
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Xin-Yuan Sun
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Zhuo Li
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- *Correspondence: Yan Cheng, ; Zhuo Li,
| | - Yan Cheng
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Hunan Provincial Engineering Research Centre of Translational Medicine and Innovative Drug, Changsha, China
- *Correspondence: Yan Cheng, ; Zhuo Li,
| |
Collapse
|
6
|
Zhang X, Guo Y, Xiao T, Li J, Guo A, Lei L, Jin C, Long Q, Su J, Yin M, Liu H, Chen C, Zhou Z, Zhu S, Tao J, Hu S, Chen X, Peng C. CD147 mediates epidermal malignant transformation through the RSK2/AP-1 pathway. J Exp Clin Cancer Res 2022; 41:246. [PMID: 35964097 PMCID: PMC9375950 DOI: 10.1186/s13046-022-02427-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 07/01/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Malignant transformation of the epidermis is an essential process in the pathogenesis of cutaneous squamous-cell carcinoma (cSCC). Although evidence has demonstrated that CD147 plays key roles in various tumors, the role of CD147 in epidermal malignant transformation in vivo remains unclear.
Methods
Epidermal CD147-overexpression or knockout (EpiCD147-OE or EpiCD147-KO) transgenic mouse models were generated for in vivo study. RNA-sequencing and q-PCR were performed to identify the differentially expressed genes. Immunohistochemistry and flow cytometry were performed to investigate the role of CD147 in regulating myeloid-derived suppressor cells (MDSCs). Immunoprecipitation, EMSA and ChIP assays were performed to investigate the mechanism of CD147 in cell transformation.
Results
We found that specific overexpression of CD147 in the epidermis (EpiCD147-OE) induces spontaneous tumor formation; moreover, a set of chemokines and cytokines including CXCL1, which play essential function in MDSC recruitment, were significantly upregulated in EpiCD147-OE transgenic mice. As expected, overexpression of CD147 in the epidermis remarkably facilitated tumorigenesis by increasing the rate of tumor initiation and the number and size of tumors in the DMBA/TPA mouse model. Interestingly, the expression of CXCL1 and the infiltration of MDSCs were dramatically increased in EpiCD147-OE transgenic mice. Our findings also showed that knockdown of CD147 attenuated EGF-induced malignant transformation as well as CXCL1 expression in HaCaT cells. Consistently, CD147 was found overexpressed in cutaneous squamous cell carcinoma (cSCC), and positively related with the expression of CD33, a myeloid-associated marker. We further identified RSK2, a serine/threonine kinase, as an interacting partner of CD147 at the binding site of CD147D207-230. The interaction of CD147 and RSK2 activated RSK2, thus enhancing AP-1 transcriptional activation. Furthermore, EMSAs and ChIP assays showed that AP-1 could associate with the CXCL1 promoter. Importantly, RSK2 inhibitor suppressed the tumor growth in DMBA/TPA mouse model by inhibiting the recruitment of MDSCs.
Conclusion
Our findings demonstrate that CD147 exerts a key function in epidermal malignant transformation in vivo by activating keratinocytes and recruiting MDSCs via the RSK2/AP-1 pathway.
Collapse
|
7
|
Li Y, Yu P, Long J, Tang L, Zhang X, Zhou Z, Cao D, Su J, Chen X, Peng C. A novel ribosomal protein S6 kinase 2 inhibitor attenuates the malignant phenotype of cutaneous malignant melanoma cells by inducing cell cycle arrest and apoptosis. Bioengineered 2022; 13:13555-13570. [PMID: 36700473 PMCID: PMC9275999 DOI: 10.1080/21655979.2022.2080364] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Malignant melanoma (MM) is a highly life-threatening tumor causing the majority of the cutaneous cancer-related deaths. Previously, ribosomal protein S6 kinase 2 (RSK2), the downstream effector of the MAPK pathway, represents a therapeutic target in melanoma. AE007 is discovered as a targeted RSK2 inhibitor, and subsequent results showed that AE007 inhibits RSK2 by directly binding to its protein kinase domain. AE007 causes cell cycle arrest and cellular apoptosis, thereby dramatically inhibiting proliferation, migration, and invasion of melanoma cells. Nevertheless, melanocytes and keratinocytes are not affected by this compound. In addition, suppression of RSK2 abrogates the inhibitory effect of AE007 on melanoma cell proliferation. AE007 treatment significantly inhibits the expression of Cyclin D1, Cyclin B1, CDK2, and Bcl-2, while raises the cleavage of PARP. Moreover, RNA sequencing results show that AE007 treatment can affect the genes expression profile, including the expression of cell cycle and DNA replication genes. In conclusion, AE007 is a promising melanoma therapeutic agent by targeting RSK2.
Collapse
Affiliation(s)
- Yayun Li
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Pian Yu
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jing Long
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ling Tang
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xu Zhang
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhe Zhou
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - DongSheng Cao
- Hunan Key Laboratory of Processed Food for Special Medical Purpose, Central South University of Forestry and Technology, Hunan, China
| | - Juan Su
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xiang Chen
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China,Xiang Chen Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Cong Peng
- Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Clinical Research Center for Cancer Immunotherapy, Xiangya Hospital, Central South University, Changsha, Hunan, China,National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Central South University, Changsha, Hunan, China,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China,CONTACT Cong Peng Department of Dermatology, Hunan Engineering Research Center of Skin Health and Disease, Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Hospital, Central South University, Changsha, Hunan, China
| |
Collapse
|
8
|
Kaempferol sensitizes cell proliferation inhibition in oxaliplatin-resistant colon cancer cells. Arch Pharm Res 2021; 44:1091-1108. [PMID: 34750753 DOI: 10.1007/s12272-021-01358-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 11/02/2021] [Indexed: 10/19/2022]
Abstract
Resolution to chemoresistance is a major challenge in patients with advanced-stage malignancies. Thus, identification of action points and elucidation of molecular mechanisms for chemoresist human cancer are necessary to overcome this challenge. In this study, we provide important evidence that kaempferol targeting RSKs might be a strategy to reduce the oxaliplatin-resistant colon cancer cells. We found that MAPK and PI3K-AKT signaling were increased in oxaliplatin (Ox)-resistant HCT116 (HCT116-OxR) cells compared to Ox-sensitive HCT116 (HCT116-OxS) cells. Comparison of cell sensitivities using SP600125 (JNK inhibitor), SB206580 (p38 kinase inhibitor), or MK-2206 (AKT inhibitor) revealed that cell proliferation inhibition was strongly observed in HT29 cells compared to that in HCT116 cells in both OxS and OxR cells. Interestingly, SP600125, SB206580, and MK-2206 treatment showed higher cell proliferation inhibition in OxS cells than that in OxR cells in both HCT116 and HT29 cells, except following treatments with 10 µM of SP600125, and 30 µM of SB206580. In comparison to magnolin and aschantin, kaempferol showed the strongest inhibitory effect on cell proliferation in both HCT116 and HT29 cells. Importantly, HCT116- and HT29-OxR cells showed higher sensitivities to cell proliferation inhibition than those of HCT116- and HT29-OxS cells, resulting in the accumulation of cells at the G2/M-phases of the cell cycle. Finally, we showed that AP-1 transactivation activity was markedly decreased by kaempferol in HCT116- and HT29-OxR cells compared to the activity levels in HCT116- and HT29-OxS cells. Taken together, the results demonstrate that kaempferol-mediated AP-1 inhibition might be an important signaling mechanism to resolve the chemoresistance of Ox-resistant colon cancer cells.
Collapse
|
9
|
Ullah R, Yin Q, Snell AH, Wan L. RAF-MEK-ERK pathway in cancer evolution and treatment. Semin Cancer Biol 2021; 85:123-154. [PMID: 33992782 DOI: 10.1016/j.semcancer.2021.05.010] [Citation(s) in RCA: 146] [Impact Index Per Article: 48.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/03/2021] [Accepted: 05/06/2021] [Indexed: 12/13/2022]
Abstract
The RAF-MEK-ERK signaling cascade is a well-characterized MAPK pathway involved in cell proliferation and survival. The three-layered MAPK signaling cascade is initiated upon RTK and RAS activation. Three RAF isoforms ARAF, BRAF and CRAF, and their downstream MEK1/2 and ERK1/2 kinases constitute a coherently orchestrated signaling module that directs a range of physiological functions. Genetic alterations in this pathway are among the most prevalent in human cancers, which consist of numerous hot-spot mutations such as BRAFV600E. Oncogenic mutations in this pathway often override otherwise tightly regulated checkpoints to open the door for uncontrolled cell growth and neoplasia. The crosstalk between the RAF-MEK-ERK axis and other signaling pathways further extends the proliferative potential of this pathway in human cancers. In this review, we summarize the molecular architecture and physiological functions of the RAF-MEK-ERK pathway with emphasis on its dysregulations in human cancers, as well as the efforts made to target the RAF-MEK-ERK module using small molecule inhibitors.
Collapse
Affiliation(s)
- Rahim Ullah
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Qing Yin
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Aidan H Snell
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA
| | - Lixin Wan
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA; Department of Cutaneous Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, 33612, USA.
| |
Collapse
|
10
|
RSK2 protects human breast cancer cells under endoplasmic reticulum stress through activating AMPKα2-mediated autophagy. Oncogene 2020; 39:6704-6718. [PMID: 32958832 DOI: 10.1038/s41388-020-01447-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/14/2020] [Accepted: 08/24/2020] [Indexed: 01/07/2023]
Abstract
Autophagy can protect stressed cancer cell by degradation of damaged proteins and organelles. However, the regulatory mechanisms behind this cellular process remain incompletely understood. Here, we demonstrate that RSK2 (p90 ribosomal S6 kinase 2) plays a critical role in ER stress-induced autophagy in breast cancer cells. We demonstrated that the promotive effect of RSK2 on autophagy resulted from directly binding of AMPKα2 in nucleus and phosphorylating it at Thr172 residue. IRE1α, an ER membrane-associated protein mediating unfolded protein response (UPR), is required for transducing the signal for activation of ERK1/2-RSK2 under ER stress. Suppression of autophagy by knockdown of RSK2 enhanced the sensitivity of breast cancer cells to ER stress both in vitro and in vivo. Furthermore, we demonstrated that inhibition of RSK2-mediated autophagy rendered breast cancer cells more sensitive to paclitaxel, a chemotherapeutic agent that induces ER stress-mediated cell death. This study identifies RSK2 as a novel controller of autophagy in tumor cells and suggests that targeting RSK2 can be exploited as an approach to reinforce the efficacy of ER stress-inducing agents against cancer.
Collapse
|
11
|
Garg C, Sharma H, Garg M. Skin photo-protection with phytochemicals against photo-oxidative stress, photo-carcinogenesis, signal transduction pathways and extracellular matrix remodeling-An overview. Ageing Res Rev 2020; 62:101127. [PMID: 32721499 DOI: 10.1016/j.arr.2020.101127] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 07/04/2020] [Accepted: 07/15/2020] [Indexed: 12/19/2022]
Abstract
Excessive exposure of skin to UV radiation triggers the generation of oxidative stress, inflammation, immunosuppression, apoptosis, matrix-metalloproteases production, and DNA mutations leading to the onset of photo ageing and photo-carcinogenesis. At the molecular level, these changes occur via activation of several protein kinases as well as transcription pathways, formation of reactive oxygen species, and release of cytokines, interleukins and prostaglandins together. Current therapies available on the market only provide limited solutions and exhibit several side effects. The present paper provides insight into scientific studies that have elucidated the positive role of phytochemicals in counteracting the UV-induced depletion of antioxidant enzymes, increased lipid peroxidation, inflammation, DNA mutations, increased senescence, dysfunctional apoptosis and immune suppression. The contribution of phytochemicals to the downregulation of expression of oxidative-stress sensitive transcription factors (Nrf2, NF-Kb, AP-1 and p53) and protein kinases (MSK, ERK, JNK, p38 MAPK, p90RSK2 and CaMKs) involved in inflammation, apoptosis, immune suppression, extracellular matrix remodelling, senescence, photo ageing and photo-carcinogenesis, is also discussed. Conclusively, several phytochemicals hold potential for the development of a viable solution against UV irradiation-mediated photo ageing, photo-carcinogenesis and related manifestations.
Collapse
|
12
|
Zhang X, Cai L, Zhao S, Long J, Li J, Wu L, Su J, Zhang J, Tao J, Zhou J, Chen X, Peng C. CX-F9, a novel RSK2 inhibitor, suppresses cutaneous melanoma cells proliferation and metastasis through regulating autophagy. Biochem Pharmacol 2019; 168:14-25. [DOI: 10.1016/j.bcp.2019.06.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 06/12/2019] [Indexed: 02/06/2023]
|
13
|
RSK2-Mediated ELK3 Activation Enhances Cell Transformation and Breast Cancer Cell Growth by Regulation of c-fos Promoter Activity. Int J Mol Sci 2019; 20:ijms20081994. [PMID: 31018569 PMCID: PMC6515335 DOI: 10.3390/ijms20081994] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 04/17/2019] [Accepted: 04/19/2019] [Indexed: 12/14/2022] Open
Abstract
Ribosomal S6 kinase 2 (RSK2), regulated by Ras/Raf/MEKs/ERKs, transmits upstream activation signals to downstream substrates including kinases and transcription and epigenetic factors. We observed that ELK members, including ELK1, 3, and 4, highly interacted with RSK2. We further observed that the RSK2-ELK3 interaction was mediated by N-terminal kinase and linker domains of RSK2, and the D and C domains of ELK3, resulting in the phosphorylation of ELK3. Importantly, RSK2-mediated ELK3 enhanced c-fos promoter activity. Notably, chemical inhibition of RSK2 signaling using kaempferol (a RSK2 inhibitor) or U0126 (a selective MEK inhibitor) suppressed EGF-induced c-fos promoter activity. Moreover, functional deletion of RSK2 by knockdown or knockout showed that RSK2 deficiency suppressed EGF-induced c-fos promoter activity, resulting in inhibition of AP-1 transactivation activity and Ras-mediated foci formation in NIH3T3 cells. Immunocytofluorescence assay demonstrated that RSK2 deficiency reduced ELK3 localization in the nucleus. In MDA-MB-231 breast cancer cells, knockdown of RSK2 or ELK3 suppressed cell proliferation with accumulation at the G1 cell cycle phase, resulting in inhibition of foci formation and anchorage-independent cancer colony growth in soft agar. Taken together, these results indicate that a novel RSK2/ELK3 signaling axis, by enhancing c-Fos-mediated AP-1 transactivation activity, has an essential role in cancer cell proliferation and colony growth.
Collapse
|
14
|
Sechi M, Lall RK, Afolabi SO, Singh A, Joshi DC, Chiu SY, Mukhtar H, Syed DN. Fisetin targets YB-1/RSK axis independent of its effect on ERK signaling: insights from in vitro and in vivo melanoma models. Sci Rep 2018; 8:15726. [PMID: 30356079 PMCID: PMC6200766 DOI: 10.1038/s41598-018-33879-w] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 10/06/2018] [Indexed: 12/14/2022] Open
Abstract
The anti-proliferative activity of dietary flavonoid fisetin has been validated in various cancer models. Establishing its precise mechanism of action has proved somewhat challenging given the multiplicity of its targets. We demonstrated that YB-1 promotes epithelial-to-mesenchymal transition and its inhibition suppressed tumor cell proliferation and invasion. The p90 ribosomal S6 kinase (RSK), an important ERK effector, activates YB-1 to drive melanoma growth. We found that fisetin treatment of monolayer/3-D melanoma cultures resulted in YB-1 dephosphorylation and reduced transcript levels. In parallel, fisetin suppressed mesenchymal markers and matrix-metalloproteinases in melanoma cells. Data from cell-free/cell-based systems indicated that fisetin inhibited RSK activity through binding to the kinase. Affinity studies for RSK isoforms evaluated stronger interaction for RSK2 than RSK1. Competition assays performed to monitor binding responses revealed that YB-1 and RSK2 do not compete, rather binding of fisetin to RSK2 promotes its binding to YB-1. Fisetin suppressed YB-1/RSK signaling independent of its effect on ERK, and reduced MDR1 levels. Comparable efficacy of fisetin and vemurafenib for inhibiting melanoma growth was noted albeit through divergent modulation of ERK. Our studies provide insight into additional modes of regulation through which fisetin interferes with melanoma growth underscoring its potential therapeutic efficacy in disease progression.
Collapse
Affiliation(s)
- Mario Sechi
- Department of Chemistry and Pharmacy, University of Sassari, Sassari, Italy
| | - Rahul K Lall
- Department of Dermatology, University of Wisconsin, Madison, USA
| | - Saheed O Afolabi
- Department of Dermatology, University of Wisconsin, Madison, USA
| | - Anant Singh
- Department of Dermatology, University of Wisconsin, Madison, USA
| | - Dinesh C Joshi
- Department of Neuroscience, University of Wisconsin, Madison, USA
| | - Shing-Yan Chiu
- Department of Neuroscience, University of Wisconsin, Madison, USA
| | - Hasan Mukhtar
- Department of Dermatology, University of Wisconsin, Madison, USA
| | - Deeba N Syed
- Department of Dermatology, University of Wisconsin, Madison, USA.
| |
Collapse
|
15
|
Zhan S, Li J, Wang T, Ge W. Quantitative Proteomics Analysis of Sporadic Medullary Thyroid Cancer Reveals FN1 as a Potential Novel Candidate Prognostic Biomarker. Oncologist 2018; 23:1415-1425. [PMID: 29739896 DOI: 10.1634/theoncologist.2017-0399] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 03/23/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Sporadic medullary thyroid cancer (MTC) is a rare neuroendocrine tumor. Currently, although the diagnosis of sporadic MTC is relatively simple, the need to discover novel candidate prognostic biomarkers for sporadic MTC and investigate the underlying mechanism involved in this rare disease is urgent. MATERIALS AND METHODS We employed tandem mass tag-based liquid chromatography-mass spectrometry to identify and analyze differentially expressed proteins (DEPs) in sporadic MTC. Western blotting was used to validate the DEPs. Immunohistochemistry was performed to investigate FN1 and RPS6KA3 in an independent set of sporadic MTC tissues. Immunohistochemical data were analyzed by different statistical methods. RESULTS Three hundred eighty-eight DEPs were identified in mass spectrometry, mainly involved in the extracellular matrix, cytoskeletal remodeling, or oxidoreductase activity. Among them, THBS1, MMP9, FN1, RPS6KA3, SYT1, and carcinoembryonic antigen were successfully validated by Western blot. In addition, FN1 and RPS6KA3, enriched in extracellular matrix (ECM) remodeling and the mitogen-activated protein kinase (MAPK) signaling pathway, respectively, were investigated in an independent set of sporadic MTC tissues. Receiver-operator characteristic curve analysis showed that FN1 and RPS6KA3 can be used for discriminating sporadic MTC tumorous tissues from paired normal thyroid tissues, and the clinical biomarker calcitonin was positively correlated with FN1 and RPS6KA3 in tumorous tissues. Furthermore, the immunohistochemical scores of FN1 in tumorous tissue showed an inverse relationship with tumor classification, lymph node classification, and American Joint Committee on Cancer stage. Through univariate and multivariate analysis for progression-free survival, we also found that low FN1 expression in tumorous tissues was an independent worse prognostic factor for progression-free survival. CONCLUSION We identified that the pathophysiology of sporadic MTC involve numerous pathways, including the synaptic vesicle pathway, the MAPK signaling pathway, and the ECM remodeling pathway. Furthermore, our study also identified FN1 as novel prognostic biomarkers related to the pathophysiologic changes in sporadic MTC. IMPLICATIONS FOR PRACTICE Proteomic dissection and prognostic biomarkers are scarce in sporadic medullary thyroid cancer (MTC). This article reports the use of proteomics technology to comprehensively investigate the molecular mechanisms of sporadic MTC, which resulted in the identification of FN1 as a novel candidate prognostic biomarker.
Collapse
Affiliation(s)
- Shaohua Zhan
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, National Key Laboratory of Medical Molecular Biology & Department of Immunology, Beijing, People's Republic of China
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, People's Republic of China
| | - Jinming Li
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, People's Republic of China
| | - Tianxiao Wang
- Key Laboratory of Carcinogenesis and Translational Research, Department of Head and Neck Surgery, Peking University Cancer Hospital & Institute, Beijing, People's Republic of China
| | - Wei Ge
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, National Key Laboratory of Medical Molecular Biology & Department of Immunology, Beijing, People's Republic of China
| |
Collapse
|
16
|
Truong VL, Kong AN, Jeong WS. Red Ginseng Oil Inhibits TPA-Induced Transformation of Skin Epidermal JB6 Cells. J Med Food 2017; 21:380-389. [PMID: 29271701 DOI: 10.1089/jmf.2017.4082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Red ginseng oil (RGO) has been shown to possess anti-inflammatory and hepatoprotective activity. In this study, we evaluated the inhibitory effect of RGO on 12-O-tetradecanoylphorbol-13-acetate (TPA)-stimulated neoplastic transformation of JB6 P+ cells. RGO pretreatment abolished the transformation of JB6 P+ cells challenged by TPA. RGO suppressed the transactivation of activator protein-1 (AP-1) and nuclear factor kappa B (NF-κB) transcription factors as well as protein levels of cyclooxygenase-2, cyclin D1, cyclin E, and Bcl-2 in the TPA-treated cells. Additionally, TPA-induced phosphorylations of extracellular signal-regulated kinases, 90 kDa ribosomal S6 kinase 2, c-Jun N-terminal kinases, and glycogen synthase kinase 3β were downregulated in the presence of RGO. Furthermore, RGO induced the nuclear factor erythroid 2-related factor 2 (Nrf2)-mediated antioxidant enzyme heme oxygenase-1 (HO-1) expression, and effectively blocked the overproduction of TPA-induced reactive oxygen species. These results suggest that RGO exerts a potent chemopreventive activity in skin cell model.
Collapse
Affiliation(s)
- Van-Long Truong
- 1 Department of Food and Life Sciences, College of BNIT, Inje University , Gimhae, Korea
| | - Ah Ng Kong
- 2 Department of Pharmaceutics, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway, New Jersey, USA
| | - Woo-Sik Jeong
- 1 Department of Food and Life Sciences, College of BNIT, Inje University , Gimhae, Korea
| |
Collapse
|
17
|
Rasmussen MK, Nielsen J, Kjellerup RB, Andersen SM, Rittig AH, Johansen C, Iversen L, Gesser B. Protein phosphatase 2Cδ/Wip1 regulates phospho-p90RSK2 activity in lesional psoriatic skin. J Inflamm Res 2017; 10:169-180. [PMID: 29290690 PMCID: PMC5735993 DOI: 10.2147/jir.s152869] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Objectives P90 ribosomal S6 kinase (RSK) 1 and 2 are serine/threonine protein kinases believed to mediate proliferation and apoptosis via the extracellular signal-regulated kinases (ERK1/2) signaling pathway. Macrophage migration inhibitory factor (MIF) and epidermal growth factor (EGF) are activators of this pathway and are elevated in the serum of patients with psoriasis compared with healthy controls. Studies on COS-7 cell cultures have shown that protein phosphatase 2Cδ (PP2Cδ) decreases the activity of RSK2 following EGF stimulation. We therefore hypothesize that PP2Cδ regulates RSK2 activity in psoriasis. Methods In paired biopsies from nonlesional (NL) and lesional (L) skins, we analyzed the level of RSK1, 2 phosphorylation and the expression of PP2Cδ isoforms, integrin-linked kinase-associated serine/threonine phosphatase (ILKAP) and wild-type p53-induced phosphatase 1 (Wip1) by Western blotting, immunofluorescence and coimmunoprecipitation with monoclonal antibody for RSK2. The induction of Wip1 by MIF or EGF was studied in cultured normal human keratinocytes. Results The protein level of RSK1, 2 phosphorylated at T573/T577 was significantly increased in L compared with NL psoriatic skin, while phosphorylation at S380/S386 was reduced in L compared with NL psoriatic skin when assayed by Western blotting and immunofluorescence microscopy. ILKAP expression was significantly higher in L than in NL skin, whereas Wip1 was expressed in similar amounts but showed increased coimmunoprecipitation with RSK2 in L compared with NL psoriatic skin. In cultured normal human keratinocytes stimulated with MIF, Wip1 phosphorylation and Wip1 expression were increased after 24 hours, but not when costimulated with dimethyl fumarate (DMF). The increased coimmunoprecipitation of Wip1 with RSK2 was significantly induced by EGF or MIF activation at 24 hours and could be significantly inhibited by DMF or the ERK1/2 inhibitor PD98059. Conclusion The complex formation of Wip1 with RSK2 indicates a direct interaction reducing P-RSK2 (S386) activation in L skin and indicates that Wip1 has a role in the pathogenesis of psoriasis.
Collapse
Affiliation(s)
- Mads K Rasmussen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Jakob Nielsen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | | | - Stine M Andersen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Anne H Rittig
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Claus Johansen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Lars Iversen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Borbala Gesser
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| |
Collapse
|
18
|
Im JY, Kim BK, Lee JY, Park SH, Ban HS, Jung KE, Won M. DDIAS suppresses TRAIL-mediated apoptosis by inhibiting DISC formation and destabilizing caspase-8 in cancer cells. Oncogene 2017; 37:1251-1262. [DOI: 10.1038/s41388-017-0025-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 08/16/2017] [Accepted: 09/27/2017] [Indexed: 11/09/2022]
|
19
|
Kim JE, Heo YS, Lee KW. Osajin Inhibits Solar UV-Induced Cyclooxygenase-2 Expression Through Direct Inhibition of RSK2. J Cell Biochem 2017; 118:4080-4087. [PMID: 28409880 DOI: 10.1002/jcb.26063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 04/13/2017] [Indexed: 01/10/2023]
Abstract
Solar ultraviolet light (sUV) has been shown to promote the development of skin disorders including inflammation, photoaging, and skin carcinogenesis. Osajin is the major bioactive isoflavone present in the fruit of Maclura pomifera, commonly referred to as the Osage orange. In this study, we observed that osajin inhibited sUV-induced cyclooxygenase (COX)-2 protein expression in both HaCaT and JB6 cells. COX-2 is a major mediator of skin inflammation. sUV activated the transcription factors nuclear factor-κB and activator protein-1 which, in turn, induces COX-2 expression. Osajin inhibited transactivation of these transcription factors. We identified RSK2 as an inhibitory target of osajin by screening against 68 kinases related to inflammation. Osajin binds with RSK2 directly in an ATP-competitive manner. Computer modeling simulated a plausible binding orientation between osajin and RSK2. Osajin inhibited sUV-induced phosphorylation of histone H3, a substrate of RSK2. However, sUV-induced phosphorylation of extracellular signal-regulated kinases, p38 kinase, c-Jun N-terminal kinase and Akt, which are signaling factors upstream of RSK2, was unchanged in the presence of osajin. The anti-inflammatory effects and molecular mechanism of osajin suggest that it may have utility as a functional food for skin health and cosmetic ingredient. J. Cell. Biochem. 118: 4080-4087, 2017. © 2017 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Jong-Eun Kim
- Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Goyang, Republic of Korea.,WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence, Seoul National University, Seoul, Republic of Korea.,Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Yong-Seok Heo
- Department of Chemistry, Konkuk University, Seoul, Republic of Korea
| | - Ki Won Lee
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence, Seoul National University, Seoul, Republic of Korea
| |
Collapse
|
20
|
Cho YY. RSK2 and its binding partners in cell proliferation, transformation and cancer development. Arch Pharm Res 2016; 40:291-303. [DOI: 10.1007/s12272-016-0880-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 12/17/2016] [Indexed: 12/31/2022]
|
21
|
Utepbergenov D, Hennig PM, Derewenda U, Artamonov MV, Somlyo AV, Derewenda ZS. Bacterial Expression, Purification and In Vitro Phosphorylation of Full-Length Ribosomal S6 Kinase 2 (RSK2). PLoS One 2016; 11:e0164343. [PMID: 27732676 PMCID: PMC5061434 DOI: 10.1371/journal.pone.0164343] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 09/24/2016] [Indexed: 02/06/2023] Open
Abstract
Ribosomal S6 kinases (RSK) play important roles in cell signaling through the mitogen-activated protein kinase (MAPK) pathway. Each of the four RSK isoforms (RSK1-4) is a single polypeptide chain containing two kinase domains connected by a linker sequence with regulatory phosphorylation sites. Here, we demonstrate that full-length RSK2-which is implicated in several types of cancer, and which is linked to the genetic Coffin-Lowry syndrome-can be overexpressed with high yields in Escherichia coli as a fusion with maltose binding protein (MBP), and can be purified to homogeneity after proteolytic removal of MBP by affinity and size-exclusion chromatography. The purified protein can be fully activated in vitro by phosphorylation with protein kinases ERK2 and PDK1. Compared to full-length RSK2 purified from insect host cells, the bacterially expressed and phosphorylated murine RSK2 shows the same levels of catalytic activity after phosphorylation, and sensitivity to inhibition by RSK-specific inhibitor SL0101. Interestingly, we detect low levels of phosphorylation in the nascent RSK2 on Ser386, owing to autocatalysis by the C-terminal domain, independent of ERK. This observation has implications for in vivo signaling, as it suggests that full activation of RSK2 by PDK1 alone is possible, circumventing at least in some cases the requirement for ERK.
Collapse
Affiliation(s)
- Darkhan Utepbergenov
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America
| | - Paulina M Hennig
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America.,Department of Molecular Genetics, University of Lodz, Lodz, Poland
| | - Urszula Derewenda
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America
| | - Mykhaylo V Artamonov
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America
| | - Avril V Somlyo
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America
| | - Zygmunt S Derewenda
- Department of Molecular Physiology and Biological Physics, University of Virginia, School of Medicine, Charlottesville, Virginia, United States of America
| |
Collapse
|
22
|
Abstract
INTRODUCTION The p90 ribosomal S6 kinases (RSK) are a family of Ser/Thr protein kinases that are downstream effectors of MEK1/2-ERK1/2. Increased RSK activation is implicated in the etiology of multiple pathologies, including numerous types of cancers, cardiovascular disease, liver and lung fibrosis, and infections. AREAS COVERED The review summarizes the patent and scientific literature on small molecule modulators of RSK and their potential use as therapeutics. The patents were identified using World Intellectual Property Organization and United States Patent and Trademark Office databases. The compounds described are predominantly RSK inhibitors, but a RSK activator is also described. The majority of the inhibitors are not RSK-specific. EXPERT OPINION Based on the overwhelming evidence that RSK is involved in a number of diseases that have high mortalities it seems surprising that there are no RSK modulators that have pharmacokinetic properties suitable for in vivo use. MEK1/2 inhibitors are in the clinic, but the efficacy of these compounds appears to be limited by their side effects. We hypothesize that targeting the downstream effectors of MEK1/2, like RSK, are an untapped source of drug targets and that they will generate less side effects than MEK1/2 inhibitors because they regulate fewer effectors.
Collapse
Affiliation(s)
- Katarzyna A Ludwik
- a Department of Pathology, Microbiology & Immunology , Vanderbilt University , Nashville , TN , USA
| | - Deborah A Lannigan
- a Department of Pathology, Microbiology & Immunology , Vanderbilt University , Nashville , TN , USA.,b Department of Cancer Biology , Vanderbilt University , Nashville , TN , USA
| |
Collapse
|
23
|
Qiu Q, Jiang J, Lin L, Cheng S, Xin D, Jiang W, Shen J, Hu Z. Downregulation of RSK2 influences the biological activities of human osteosarcoma cells through inactivating AKT/mTOR signaling pathways. Int J Oncol 2016; 48:2508-20. [PMID: 27082640 DOI: 10.3892/ijo.2016.3481] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 02/18/2016] [Indexed: 11/06/2022] Open
Abstract
RSK2 (90 kDa ribosomal S6 kinase) is a downstream effector of the Ras/ERK (extracellular signal-regulated kinase) signaling pathway that has major functions in cell biological activities, including regulating nuclear signaling, cell cycle progression, cell proliferation, cell growth, protein synthesis, cell migration and cell survival, and is expressed in most types of human malignant tumors, including lung cancer, prostate and breast tumors, skin cancer and osteosarcomas (OS). RSK2 was found to be essential for osteosarcoma formation. To investigate whether RSK2 is expressed at high levels in human osteosarcome tissues and whether its expression is correlated with the aggressive biological behavior of osteosarcoma cell line (OCLs), we assessed the association between RSK2 expression and OS cell progression, as well as the effects of RSK2 inhibition on the biological activities of osteosarcoma cells. We performed immunohistochemistry to analyze the expression of RSK2 in specimens from 30 humans with osteosarcoma, and 15 normal tissues. RSK2 gene expression levels in 30 specimens with osteosarcoma were significantly higher than those of normal tissues. We performed RNA interference on three OCLs to evaluate cell apoptosis, cell growth, cell proliferation, cell motility, chemosensitivity and oncogenicity. After transfection with RSK2 shRNA, increased cell apoptosis, cell growth inhibition, cell cycle progression, weaker cell proliferation, cell migration and weaker tumor formation were observed in all OCLs. These results suggested that RSK2 expression may mediate the biological activities of OS cells and RSK2 may be an effective therapeutic target for the treatment of osteosarcomas. The AKT/mTOR, MAPK/ERK/c-Fos and Bcl2/Bax pathways were analysed to clarify the mechanisms involved.
Collapse
Affiliation(s)
- Quanhe Qiu
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Jing Jiang
- Department of Clinical Laboratory, The Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, P.R. China
| | - Liangbo Lin
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Si Cheng
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Daqi Xin
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Neimenggu Medical University, Huhehaote, Neimeng 010030, P.R. China
| | - Wei Jiang
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Jieliang Shen
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Zhenming Hu
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| |
Collapse
|
24
|
Kim JE, Lee KW. Silkworm Thorn Stem Extract Targets RSK2 and Suppresses Solar UV-Induced Cyclooxygenase-2 Expression. Int J Mol Sci 2015; 16:25096-107. [PMID: 26506342 PMCID: PMC4632792 DOI: 10.3390/ijms161025096] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/30/2015] [Accepted: 10/10/2015] [Indexed: 12/27/2022] Open
Abstract
Excessive exposure to solar UV (sUV) is associated with numerous human skin disorders, such as carcinogenesis, skin photoaging and skin inflammation. Silkworm Thorn (Cudraniatricuspidata, SW) is a plant belonging to the Moraceae family and widely present throughout Korea, China, and Japan. Most parts of the tree (including the fruit, leaf, stem, root, and bark) is consumable as a functional food or tea. In this study, we found that SW extract (SWE) inhibited the elevated expression of sUV-induced cyclooxygenase (COX)-2 levels in both HaCaT and JB6 cells. Levels of nuclear factor-κB and activator protein-1, two crucial transcription factors involved in COX-2 expression, were elevated by sUV treatment. Treatment with SWE abolished this activation. SWE also inhibited sUV-induced histone H3 phosphorylation. However, sUV-induced phosphorylation of Akt, c-Jun N-terminal kinase and p38 kinase remained unchanged in the presence of SWE. SWE inhibited RSK2 activity, and pull-down assays using SWE-Sepharose beads revealed that SWE binds directly with RSK2 in an ATP-competitive manner. These results suggest a potential for SWE to be developed as a cosmeceutical material and functional food constituent for the promotion of skin health.
Collapse
Affiliation(s)
- Jong-Eun Kim
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, Korea.
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA.
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Korea.
| | - Ki Won Lee
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence, Seoul National University, Seoul 151-921, Korea.
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Korea.
| |
Collapse
|
25
|
Abstract
RSK2 is a downstream signaling protein of ERK1 and ERK2 and plays a key role in physiological homeostasis. For this reason, RSK2 is a highly conserved protein among the p90RSK family members. In its location in the signaling pathway, RSK2 is a kinase just upstream of transcription and epigenetic factors, and a few kinases involved in cell cycle regulation and protein synthesis. Moreover, activation of RSK2 by growth factors is directly involved in cell proliferation, anchorage-independent cell transformation and cancer development. Direct evidences regarding the etiological roles of RSK2 in cancer development in humans have been published by our research group illustrating that elevated total- and phospho-RSK2 protein levels mediated by ERK1 and ERK2 are higher in skin cancer tissues compared to normal skin tissues. Notably, it has been shown that RSK2 ectopic expression in JB6 Cl41 cells induces cell proliferation and anchorage- independent cell transformation. Importantly, knockdown of RSK2 suppresses Ras-mediated foci formation and anchorage-independent colony growth of cancer cells. Kaempferol is a one of the natural compounds showing selectivity in inhibiting RSK2 activity in epidermal growth factor-induced G1/S cell cycle transition and cell transformation. Thus, ERKs/RSK2 signaling axis is an important target signaling molecule in chemoprevention.
Collapse
Affiliation(s)
- Sun-Mi Yoo
- College of Pharmacy, The Catholic University of Korea, Bucheon, Korea
| | - Sung Jun Cho
- University Honors Program, Twin Cities College of Liberal Arts, University of Minnesota, Minneapolis, MN, USA
| | - Yong-Yeon Cho
- College of Pharmacy, The Catholic University of Korea, Bucheon, Korea
| |
Collapse
|
26
|
Lee CJ, Lee MH, Yoo SM, Choi KI, Song JH, Jang JH, Oh SR, Ryu HW, Lee HS, Surh YJ, Cho YY. Magnolin inhibits cell migration and invasion by targeting the ERKs/RSK2 signaling pathway. BMC Cancer 2015; 15:576. [PMID: 26253302 PMCID: PMC4529708 DOI: 10.1186/s12885-015-1580-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 07/27/2015] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Magnolin is a natural compound abundantly found in Magnolia flos, which has been traditionally used in oriental medicine to treat headaches, nasal congestion and anti-inflammatory reactions. Our recent results have demonstrated that magnolin targets the active pockets of ERK1 and ERK2, which are important signaling molecules in cancer cell metastasis. The aim of this study is to evaluate the effects of magnolin on cell migration and to further explore the molecular mechanisms involved. METHODS Magnolin-mediated signaling inhibition was confirmed by Western blotting using RSK2(+/+) and RSK2(-/-) MEFs, A549 and NCI-H1975 lung cancer cells, and by NF-κB and Cox-2 promoter luciferase reporter assays. Inhibition of cell migration by magnolin was examined by wound healing and/or Boyden Chamber assays using JB6 Cl41 and A549 human lung cancer cells. The molecular mechanisms involved in cell migration and epithelial-to-mesenchymal transition were determined by zymography, Western blotting, real-time PCR and immunocytofluorescence. RESULTS Magnolin inhibited NF-κB transactivation activity by suppressing the ERKs/RSK2 signaling pathway. Moreover, magnolin abrogated the increase in EGF-induced COX-2 protein levels and wound healing. In human lung cancer cells such as A549 and NCI-H1975, which harbor constitutive active Ras and EGFR mutants, respectively, magnolin suppressed wound healing and cell invasion as seen by a Boyden chamber assay. In addition, it was observed that magnolin inhibited MMP-2 and -9 gene expression and activity. The knockdown or knockout of RSK2 in A549 lung cancer cells or MEFs revealed that magnolin targeting ERKs/RSK2 signaling suppressed epithelial-to-mesenchymal transition by modulating EMT marker proteins such as N-cadherin, E-cadherin, Snail, Vimentin and MMPs. CONCLUSIONS These results demonstrate that magnolin inhibits cell migration and invasion by targeting the ERKs/RSK2 signaling pathway.
Collapse
Affiliation(s)
- Cheol-Jung Lee
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Mee-Hyun Lee
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Sun-Mi Yoo
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Kyung-Il Choi
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Ji-Hong Song
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Jeong-Hoon Jang
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea. .,College of Pharmacy, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea.
| | - Sei-Ryang Oh
- Natural Medicine Research Center, Korea Research Institute of Bioscience & Biotechnology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, ChungBuk, 363-883, Republic of Korea.
| | - Hyung-Won Ryu
- Natural Medicine Research Center, Korea Research Institute of Bioscience & Biotechnology, 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gun, ChungBuk, 363-883, Republic of Korea.
| | - Hye-Suk Lee
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| | - Young-Joon Surh
- College of Pharmacy, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea.
| | - Yong-Yeon Cho
- College of Pharmacy, The Catholic University of Korea, 43, Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea.
| |
Collapse
|
27
|
Chung BM, Arutyunov A, Ilagan E, Yao N, Wills-Karp M, Coulombe PA. Regulation of C-X-C chemokine gene expression by keratin 17 and hnRNP K in skin tumor keratinocytes. ACTA ACUST UNITED AC 2015; 208:613-27. [PMID: 25713416 PMCID: PMC4347647 DOI: 10.1083/jcb.201408026] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Interaction between K17 and hnRNP K regulates CXCR3 signaling in an RSK-dependent fashion to promote epithelial tumor cell growth and invasion. High levels of the intermediate filament keratin 17 (K17) correlate with a poor prognosis for several types of epithelial tumors. However, the causal relationship and underlying mechanisms remain undefined. A recent study suggested that K17 promotes skin tumorigenesis by fostering a specific type of inflammation. We report here that K17 interacts with the RNA-binding protein hnRNP K, which has also been implicated in cancer. K17 is required for the cytoplasmic localization of hnRNP K and for its role in regulating the expression of multiple pro-inflammatory mRNAs. Among these are the CXCR3 ligands CXCL9, CXCL10, and CXCL11, which together form a signaling axis with an established role in tumorigenesis. The K17–hnRNP K partnership is regulated by the ser/thr kinase RSK and required for CXCR3-dependent tumor cell growth and invasion. These findings functionally integrate K17, hnRNP K, and gene expression along with RSK and CXCR3 signaling in a keratinocyte-autonomous axis and provide a potential basis for their implication in tumorigenesis.
Collapse
Affiliation(s)
- Byung Min Chung
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| | - Artem Arutyunov
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| | - Erika Ilagan
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| | - Nu Yao
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| | - Marsha Wills-Karp
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| | - Pierre A Coulombe
- Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205 Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205 Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205 Department of Biochemistry and Molecular Biology and Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health; and Department of Biological Chemistry, Department of Dermatology, and Department of Oncology, School of Medicine, Johns Hopkins University, MD 21205
| |
Collapse
|
28
|
Skin cancer and new treatment perspectives: A review. Cancer Lett 2015; 357:8-42. [DOI: 10.1016/j.canlet.2014.11.001] [Citation(s) in RCA: 195] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 10/31/2014] [Accepted: 11/04/2014] [Indexed: 12/25/2022]
|
29
|
Lee CJ, Lee MH, Cho YY. Fibroblast and Epidermal Growth Factors Utilize Different Signaling Pathways to Induce Anchorage-independent Cell Transformation in JB6 Cl41 Mouse Skin Epidermal Cells. J Cancer Prev 2014; 19:199-208. [PMID: 25337589 PMCID: PMC4189506 DOI: 10.15430/jcp.2014.19.3.199] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 09/11/2014] [Accepted: 09/12/2014] [Indexed: 11/25/2022] Open
Abstract
Background: Extracellular stimulation of cells with growth factors such as epidermal growth factor (EGF) induces cell proliferation and cell transformation. Although fibroblast growth factor (FGF) is a well-known family member of growth factors and acts as a ligand of FGF receptor (FGFR), a receptor tyrosine kinase, in cytoplasmic membrane, the tumor promoter potential of FGF has not been clearly understood. Methods: The role of FGF as a tumor promoter was determined measuring its effects of cell proliferation and transformation by the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium and anchorage-independent cell transformation assays, respectively. The antibody specificity of phospho-RSK2 Tyr529 was determined by Western blotting using a purified FGFR kinase domain in vitro and the membrane fraction of JB6 Cl41 cells ex vivo. The signaling pathways mediated by FGF or EGF were determined by the comparisons of phosphorylation inhibitory efficacy using signaling inhibitors including kaempferol. Results: FGF acted as a tumor promoter. FGF induced cell proliferation by stimulation of G1/S cell cycle transition, and anchorage-independent cell transformation in JB6 Cl41 cells. FGF-induced FGFR phosphorylation was suppressed by kaempferol treatment in a dose dependent manner. Interestingly, FGF stimulation utilized a non-canonical signaling pathway to activate RSK2 and activating transcription factor (ATF)-1, which was not transduced by EGF stimulation. Importantly, kaempferol inhibited tyrosine phosphorylation of FGFR by FGF stimulation and nuclear accumulation of phospho-ATF-1 at Ser63. Moreover, although kaempferol, 4’-N-benzoyl staurosporine (PKC412), 2-(2’-amino-3’-methoxyphenyl)oxanaphthalen-4-one (PD98059) and 1,4-diamino-2,3-dicyano-1,4-bis(2-aminophenylthio)buta-diene (U0126) inhibited EGF-induced anchorage-independent cell transformation in JB6 Cl41 cells, FGF-induced cell transformation in soft agar was only inhibited by PKC412 and kaempferol, but not by PD98059 and U0126. Conclusions: FGF acts as a tumor promoter and dual inhibition of kaempferol on the kinase activities of FGFR3 and RSK2 suppresses the FGF-induced neoplastic cell transformation through a non-canonical signaling pathway which is not utilized by EGF stimulation.
Collapse
Affiliation(s)
- Cheol-Jung Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon, Korea
| | - Mee-Hyun Lee
- College of Pharmacy, The Catholic University of Korea, Bucheon, Korea
| | - Yong-Yeon Cho
- College of Pharmacy, The Catholic University of Korea, Bucheon, Korea
| |
Collapse
|
30
|
Yang G, Fu Y, Malakhova M, Kurinov I, Zhu F, Yao K, Li H, Chen H, Li W, Lim DY, Sheng Y, Bode AM, Dong Z, Dong Z. Caffeic acid directly targets ERK1/2 to attenuate solar UV-induced skin carcinogenesis. Cancer Prev Res (Phila) 2014; 7:1056-66. [PMID: 25104643 PMCID: PMC4185237 DOI: 10.1158/1940-6207.capr-14-0141] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Caffeic acid (3,4-dihydroxycinnamic acid) is a well-known phenolic phytochemical present in coffee and reportedly has anticancer activities. However, the underlying molecular mechanisms and targeted proteins involved in the suppression of carcinogenesis by caffeic acid are not fully understood. In this study, we report that caffeic acid significantly inhibits colony formation of human skin cancer cells and EGF-induced neoplastic transformation of HaCaT cells dose-dependently. Caffeic acid topically applied to dorsal mouse skin significantly suppressed tumor incidence and volume in a solar UV (SUV)-induced skin carcinogenesis mouse model. A substantial reduction of phosphorylation in mitogen-activated protein kinase signaling was observed in mice treated with caffeic acid either before or after SUV exposure. Caffeic acid directly interacted with ERK1/2 and inhibited ERK1/2 activities in vitro. Importantly, we resolved the cocrystal structure of ERK2 complexed with caffeic acid. Caffeic acid interacted directly with ERK2 at amino acid residues Q105, D106, and M108. Moreover, A431 cells expressing knockdown of ERK2 lost sensitivity to caffeic acid in a skin cancer xenograft mouse model. Taken together, our results suggest that caffeic acid exerts chemopreventive activity against SUV-induced skin carcinogenesis by targeting ERK1 and 2.
Collapse
Affiliation(s)
- Ge Yang
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
- Physiology and Pathophysiology, Basic Medical College, Zhengzhou University, ZhengZhou, 450001, China
- The First Affiliated Hospital of Zhengzhou University, ZhengZhou, 450001, China
| | - Yang Fu
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
- The First Affiliated Hospital of Zhengzhou University, ZhengZhou, 450001, China
| | - Margarita Malakhova
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Igor Kurinov
- Cornell University, NE-CAT, APS, Argonne, IL 60439, USA
| | - Feng Zhu
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Ke Yao
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Haitao Li
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Hanyong Chen
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Wei Li
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Do Young Lim
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Yuqiao Sheng
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
- Physiology and Pathophysiology, Basic Medical College, Zhengzhou University, ZhengZhou, 450001, China
- The First Affiliated Hospital of Zhengzhou University, ZhengZhou, 450001, China
| | - Ann M. Bode
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| | - Ziming Dong
- Physiology and Pathophysiology, Basic Medical College, Zhengzhou University, ZhengZhou, 450001, China
| | - Zigang Dong
- The Hormel Institute, University of Minnesota, Austin, Minnesota, 55912, USA
| |
Collapse
|
31
|
Yao K, Chen H, Liu K, Langfald A, Yang G, Zhang Y, Yu DH, Kim MO, Lee MH, Li H, Bae KB, Kim HG, Ma WY, Bode AM, Dong Z, Dong Z. Kaempferol targets RSK2 and MSK1 to suppress UV radiation-induced skin cancer. Cancer Prev Res (Phila) 2014; 7:958-967. [PMID: 24994661 DOI: 10.1158/1940-6207.capr-14-0126] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Solar UV (SUV) irradiation is a major factor in skin carcinogenesis, the most common form of cancer in the United States. The MAPK cascades are activated by SUV irradiation. The 90 kDa ribosomal S6 kinase (RSK) and mitogen and stress-activated protein kinase (MSK) proteins constitute a family of protein kinases that mediate signal transduction downstream of the MAPK cascades. In this study, phosphorylation of RSK and MSK1 was upregulated in human squamous cell carcinoma (SCC) and SUV-treated mouse skin. Kaempferol, a natural flavonol, found in tea, broccoli, grapes, apples, and other plant sources, is known to have anticancer activity, but its mechanisms and direct target(s) in cancer chemoprevention are unclear. Kinase array results revealed that kaempferol inhibited RSK2 and MSK1. Pull-down assay results, ATP competition, and in vitro kinase assay data revealed that kaempferol interacts with RSK2 and MSK1 at the ATP-binding pocket and inhibits their respective kinase activities. Mechanistic investigations showed that kaempferol suppresses RSK2 and MSK1 kinase activities to attenuate SUV-induced phosphorylation of cAMP-responsive element binding protein (CREB) and histone H3 in mouse skin cells. Kaempferol was a potent inhibitor of SUV-induced mouse skin carcinogenesis. Further analysis showed that skin from the kaempferol-treated group exhibited a substantial reduction in SUV-induced phosphorylation of CREB, c-Fos, and histone H3. Overall, our results identify kaempferol as a safe and novel chemopreventive agent against SUV-induced skin carcinogenesis that acts by targeting RSK2 and MSK1.
Collapse
Affiliation(s)
- Ke Yao
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912.,Pathophysiology Department, Basic Medical College, Zhengzhou University, No.100 Kexue Road, Henan, China, 450001
| | - Hanyong Chen
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Kangdong Liu
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912.,Pathophysiology Department, Basic Medical College, Zhengzhou University, No.100 Kexue Road, Henan, China, 450001
| | - Alyssa Langfald
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Ge Yang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912.,Pathophysiology Department, Basic Medical College, Zhengzhou University, No.100 Kexue Road, Henan, China, 450001
| | - Yi Zhang
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912.,Pathophysiology Department, Basic Medical College, Zhengzhou University, No.100 Kexue Road, Henan, China, 450001
| | - Dong Hoon Yu
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Myoung Ok Kim
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Mee-Hyun Lee
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Haitao Li
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Ki Beom Bae
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Hong-Gyum Kim
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Wei-Ya Ma
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Ann M Bode
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| | - Ziming Dong
- Pathophysiology Department, Basic Medical College, Zhengzhou University, No.100 Kexue Road, Henan, China, 450001
| | - Zigang Dong
- The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912
| |
Collapse
|
32
|
Wang T, Xuan X, Li M, Gao P, Zheng Y, Zang W, Zhao G. Astragalus saponins affect proliferation, invasion and apoptosis of gastric cancer BGC-823 cells. Diagn Pathol 2013; 8:179. [PMID: 24152941 PMCID: PMC3818446 DOI: 10.1186/1746-1596-8-179] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Accepted: 10/22/2013] [Indexed: 12/19/2022] Open
Abstract
Background Astragalus memebranaceus is a traditional Chinese herbal medicine used in treatment of common cold, diarrhea, fatigue, anorexia and cardiac diseases. Recently, there are growing evidences that Astragalus extract may be a potential anti-tumorigenic agent. Some research showed that the total saponins obtained from Astragalus membranaceus possess significant antitumorigenic activity. Gastric cancer is one of the most frequent cancers in the world, almost two-thirds of gastric cancer cases and deaths occur in less developed regions. But the effect of Astragalus membranaceus on proliferation, invasion and apoptosis of gastric cancer BGC-823 cells remains unclear. Methods Astragalus saponins were extracted. Cells proliferation was determined by CCK-8 assay. Cell cycle and apoptosis were detected by the flow cytometry. Boyden chamber was used to evaluate the invasion and metastasis capabilities of BGC-823 cells. Tumor growth was assessed by subcutaneous inoculation of cells into BALB/c nude mice. Results The results demonstrated that total Astragalus saponins could inhibit human gastric cancer cell growth both in vitro and in vivo, in additional, Astragalus saponins deceased the invasion ability and induced the apoptosis of gastric cancer BGC-823 cells. Conclusions Total Astragalus saponins inhibited human gastric cancer cell growth, decreased the invasion ability and induced the apoptosis. This suggested the possibility of further developing Astragalus as an alternative treatment option, or perhaps using it as adjuvant chemotherapeutic agent in gastric cancer therapy.
Collapse
Affiliation(s)
| | | | | | | | | | - Wenqiao Zang
- Department of Microbiology and Immunology, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou, People's Republic of China.
| | | |
Collapse
|
33
|
Lee CJ, Lee MH, Lee JY, Song JH, Lee HS, Cho YY. RSK2-induced stress tolerance enhances cell survival signals mediated by inhibition of GSK3β activity. Biochem Biophys Res Commun 2013; 440:112-8. [PMID: 24055036 DOI: 10.1016/j.bbrc.2013.09.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 09/07/2013] [Indexed: 12/30/2022]
Abstract
Our previous studies demonstrated that RSK2 plays a key role in cell proliferation and transformation induced by tumor promoters such as epidermal growth factor (EGF) in mouse and human skin cells. However, no direct evidence has been found regarding the relationship of RSK2 and cell survival. In this study, we found that RSK2 interacted and phosphorylated GSK3β at Ser9. Notably, GSK3β phosphorylation at Ser9 was suppressed in RSK2(-/-) MEFs compared with RSK2(+/+) MEFs by stimulation of EGF and calcium ionophore A23187, a cellular calcium stressor. In proliferation, we found that RSK2 deficiency suppressed cell proliferation compared with RSK2(+/+) MEFs. In contrast, GSK3β(-/-) MEFs induced the cell proliferation compared with GSK3β(+/+) MEFs. Importantly, RSK2(-/-) MEFs were induced severe cellular morphology change by A23187 and enhanced G1/G0 and sub-G1 accumulation of the cell cycle phase compared with RSK2(+/+) MEFs. The sub-G1 induction in RSK2(-/-) MEFs by A23187 was correlated with increase of cytochrome c release, caspase-3 cleavage and apoptotic DNA fragmentation compared with RSK2(+/+) MEFs. Notably, return back of RSK2 into RSK2(-/-) MEFs restored A23187-induced morphological change, and decreased apoptosis, apoptotic DNA fragmentation and caspase-3 induction compared with RSK2(-/-)/mock MEFs. Taken together, our results demonstrated that RSK2 plays an important role in stress-tolerance and cell survival, resulting in cell proliferation and cancer development.
Collapse
Affiliation(s)
- Cheol-Jung Lee
- Integrated Research Institute of Pharmaceutical Sciencies, College of Pharmacy, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea
| | | | | | | | | | | |
Collapse
|
34
|
Arul N, Cho YY. A Rising Cancer Prevention Target of RSK2 in Human Skin Cancer. Front Oncol 2013; 3:201. [PMID: 23936765 PMCID: PMC3733026 DOI: 10.3389/fonc.2013.00201] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 07/23/2013] [Indexed: 02/06/2023] Open
Abstract
RSK2 is a p90 ribosomal S6 kinase family (p90(RSK)) member regulating cell proliferation and transformation induced by tumor promoters such as epithelial growth factor (EGF) and 12-O-tetradecanoylphorbol-13-acetate. This family of p90(RSK) has classified as a serine/threonine kinase that respond to many growth factors, peptide hormones, neurotransmitters, and environmental stresses such as ultraviolet (UV) light. Our recent study demonstrates that RSK2 plays a key role in human skin cancer development. Activation of RSK2 by EGF and UV through extracellular-activated protein kinases signaling pathway induces cell cycle progression, cell proliferation, and anchorage-independent cell transformation. Moreover, knockdown of RSK2 by si-RNA or sh-RNA abrogates cell proliferation and cell transformation of non-malignant human skin keratinocyte, and colony growth of malignant melanoma (MM) cells in soft agar. Importantly, activated and total RSK2 protein levels are highly detected in human skin cancer tissues including squamous cell carcinoma, basal-cell carcinoma, and MM. Kaempferol and eriodictyol are natural substances to inhibit kinase activity of the RSK2 N-terminal kinase domain, which is a critical kinase domain to transduce their activation signals to the substrates by phosphorylation. In this review, we discuss the role of RSK2 in skin cancer, particularly in activation of signaling pathways and potent natural substances to target RSK2 as chemopreventive and therapeutic agents.
Collapse
Affiliation(s)
- Narayanasamy Arul
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Republic of Korea
| | - Yong-Yeon Cho
- College of Pharmacy, The Catholic University of Korea, Bucheon-si, Republic of Korea
| |
Collapse
|
35
|
Utepbergenov D, Derewenda ZS. The unusual mechanism of inhibition of the p90 ribosomal S6 kinase (RSK) by flavonol rhamnosides. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:1285-91. [PMID: 23541530 DOI: 10.1016/j.bbapap.2013.03.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Accepted: 03/19/2013] [Indexed: 12/21/2022]
Abstract
All known protein kinases share a bilobal kinase domain with well conserved structural elements. Because of significant structural similarities of nucleotide binding pocket, the development of highly selective kinase inhibitors is a very challenging task. Flavonols, naturally occurring plant metabolites, have long been known to inhibit kinases by mimicking the adenine moiety. Interestingly, recent data show that some flavonol glycosides are more selective, although underlying mechanisms were unknown. Crystallographic data from our laboratory revealed that the N-terminal kinase domain of p90 ribosomal S6 kinase, isoform 2, binds three different flavonol rhamnosides in a highly unusual manner, distinct from other kinase inhibitor interactions. The kinase domain undergoes a reorganization of several structural elements in response to the binding of the inhibitors. Specifically, the main β-sheet of the N-lobe undergoes a twisting rotation by ~56° around an axis passing through the N- and C-lobes, leading to the restructuring of the canonical ATP-binding pocket into pockets sterically adapted to the inhibitor shape. The flavonol rhamnosides appear to adopt compact, but strained conformations with the rhamnose moiety swept under the B-ring of flavonol, unlike the structure of the free counterparts in solution. These data suggest that the flavonol glycoside scaffold could be used as a template for new inhibitors selective for the RSK family. This article is part of a Special Issue entitled: Inhibitors of Protein Kinases (2012).
Collapse
Affiliation(s)
- Darkhan Utepbergenov
- Department of Molecular Physiology & Biological Physics, University of Virginia, Charlottesville, PO Box 800736, VA 22908, USA
| | | |
Collapse
|