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Liu Y, Chen P, Qi D, Chen L. Glaucocalyxin A Inhibits the Malignancies of Gastric Cancer Cells by Downregulating MDM2 and RNF6 via MiR-3658 and the SMG1-UPF mRNA Decay Pathway. Front Oncol 2022; 12:871169. [PMID: 35814430 PMCID: PMC9258495 DOI: 10.3389/fonc.2022.871169] [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: 02/07/2022] [Accepted: 05/23/2022] [Indexed: 12/16/2022] Open
Abstract
Gastric cancer (GC) ranks as the most common gastrointestinal cancer and is among the leading causes of cancer death worldwide. Glaucocalyxin A (GLA), an entkauranoid diterpene isolated from Rab-dosia japonica var., possesses various bioactivities. To date, the data on the effect of GLA on GC are still minimal, and the molecular mechanisms remain largely unknown. Herein, we found that GLA could significantly inhibit the proliferation, cell adhesion, and invasion of HGT-1, SNU-1, SNU-6, and NCI-N87 GC cells in a dose-dependent manner. GLA enhanced the apoptosis of the GC cells as evidenced by the increased caspase-3 activity and the elevated levels of cleaved caspase-3 and cleaved PARP in GC cells in the presence of GLA. We then showed that the downregulation of Murine Double Minute Clone 2 (MDM2) and Ring Finger Protein 6 (RNF6) by GLA was implicated in the GLA-induced inhibition of the GC cells. Furthermore, MDM2 and RNF6 were identified as the targets of miR-3658 that was downregulated in the GC cells and upregulated by GLA. Moreover, it was shown that miR-3658 was hypermethylated in the GC cells, and GLA could rescue the expression of miR-3658 via demethylation by abrogating EZH2-mediated epigenetic silencing. In addition to the miR-3658-MDM2/RNF6 regulatory axis, activation of the SMG1-UPF mRNA decay pathway contributed to the downregulation of MDM2 and RNF6 by GLA in the GC cells. The inhibitory effect of GLA on gastric cancer and the expression of MDM2 and RNF6 was also validated in in vivo study. Our findings suggest that has the therapeutic potential for GC by downregulating oncogenes via posttranscriptional regulation.
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Affiliation(s)
- Yanqi Liu
- Department of Gastroenterology, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, China
| | - Ping Chen
- Department of Gastroenterology, The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, China
- *Correspondence: Ping Chen,
| | - Daqing Qi
- Department of Medical Affairs, Hangzhou Huqingyu Hall Pharmaceutical Co., Ltd., Hangzhou, China
| | - Linhui Chen
- Department of Medical Affairs, Hangzhou Huqingyu Hall Pharmaceutical Co., Ltd., Hangzhou, China
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Najar MA, Aravind A, Dagamajalu S, Sidransky D, Ashktorab H, Smoot DT, Gowda H, Prasad TSK, Modi PK, Chatterjee A. Hyperactivation of MEK/ERK pathway by Ca 2+ /calmodulin-dependent protein kinase kinase 2 promotes cellular proliferation by activating cyclin-dependent kinases and minichromosome maintenance protein in gastric cancer cells. Mol Carcinog 2021; 60:769-783. [PMID: 34437731 DOI: 10.1002/mc.23343] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 01/04/2023]
Abstract
Although CAMKK2 is overexpressed in several cancers, its role and relevant downstream signaling pathways in gastric cancer (GC) are poorly understood. Treatment of AGS GC cells with a CAMKK2 inhibitor, STO-609, resulted in decreased cell proliferation, cell migration, invasion, colony-forming ability, and G1/S-phase arrest. Quantitative phosphoproteomics in AGS cells with the CAMKK2 inhibitor led to the identification of 9603 unique phosphosites mapping to 3120 proteins. We observed decreased phosphorylation of 1101 phosphopeptides (1.5-fold) corresponding to 752 proteins upon CAMKK2 inhibition. Bioinformatics analysis of hypo-phosphorylated proteins revealed enrichment of MAPK1/MAPK3 signaling. Kinase enrichment analysis of hypo-phosphorylated proteins using the X2K Web tool identified ERK1, cyclin-dependant kinase 1 (CDK1), and CDK2 as downstream substrates of CAMKK2. Moreover, inhibition of CAMKK2 and MEK1 resulted in decreased phosphorylation of ERK1, CDK1, MCM2, and MCM3. Immunofluorescence results were in concordance with our mass spectroscopy data and Western blot analysis results. Taken together, our data reveal the essential role of CAMKK2 in the pathobiology of GC through the activation of the MEK/ERK1 signaling cascade.
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Affiliation(s)
- Mohd A Najar
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Anjana Aravind
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Shobha Dagamajalu
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - David Sidransky
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Hassan Ashktorab
- Department of Medicine, Howard University, Washington, District of Columbia, USA
| | - Duane T Smoot
- Department of Medicine, Meharry Medical Center, Nashville, Tennessee, USA
| | - Harsha Gowda
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India.,Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India.,Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - T S Keshava Prasad
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Prashant K Modi
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Aditi Chatterjee
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India.,Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India.,Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
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Timóteo M, Tavares A, Cruz S, Campos C, Medeiros R, Sousa H. Association of Murine Double Minute 2 polymorphisms with gastric cancer: A systematic review with meta-analysis. Biomed Rep 2021; 15:69. [PMID: 34257965 DOI: 10.3892/br.2021.1445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 04/20/2021] [Indexed: 01/09/2023] Open
Abstract
Gastric cancer (GC) is the 5th most common type of cancer, with the 3rd highest mortality rate worldwide in both sexes. Murine double minute 2 (MDM2) protein is the major negative regulator of p53, and genetic polymorphisms in this gene have shown to be associated with several types of cancer. In the present study, a literature search was performed using PubMed and Scopus with the following key word combinations 'gastric cancer AND polymorphism AND MDM2'. Studies were carefully revised according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines to identify eligible studies that matched the inclusion criteria. Statistical analysis was performed to assess the association between the different genetic polymorphisms and GC risk, by calculating the odds ratios (OR) and the confidence intervals (CI), with a 5% level of significance. A total of 11 manuscripts studied MDM2 polymorphisms in GC: rs937283 (n=1), rs3730485 (n=1) and rs2279744 (n=9). Both the rs937283 and rs3730485 reports showed an association with GC; however, there was only one study on each of these polymorphisms in the literature. A meta-analysis was performed for the rs2279744 polymorphism, of which studies showed a positive association between the G allele and risk of GC, either in the dominant model (OR=1.46; 95% CI 1.21-1.75; P<0.001) or recessive model (OR 1.65; 95% CI 1.45-1.87; P<0.001). In conclusion, genetic polymorphisms in MDM2 seemed to be associated with an increased risk of GC development, nevertheless, the number of studies were relatively low and the studied populations were primarily Chinese. The present meta-analysis emphasizes the need for additional studies in other populations to corroborate the association of these polymorphisms with GC.
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Affiliation(s)
- Mafalda Timóteo
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal
| | - Ana Tavares
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal.,Pathology Department, Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal
| | - Sara Cruz
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal
| | - Carla Campos
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal.,Microbiology Service, Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal
| | - Rui Medeiros
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal.,Virology Service, Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal.,Research Department, Portuguese League Against Cancer (Liga Portuguesa Contra o Cancro-Núcleo Regional do Norte), 4200-172 Porto, Portugal
| | - Hugo Sousa
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal.,Virology Service, Portuguese Oncology Institute of Porto, 4200-072 Porto, Portugal
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