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Lin S, Tao C, Yan Q, Gao H, Qin L, Zhong Y, Yao Q, Zhang P, Yang J, Zou X, Xiao G. Pip5k1c expression in osteocytes regulates bone remodeling in mice. J Orthop Translat 2024; 45:36-47. [PMID: 38495744 PMCID: PMC10943313 DOI: 10.1016/j.jot.2023.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/22/2023] [Accepted: 10/24/2023] [Indexed: 03/19/2024] Open
Abstract
Research background The role of osteocytes in maintaining bone mass has been progressively emphasized. Pip5k1c is the most critical isoform among PIP5KIs, which can regulate cytoskeleton, biomembrane, and Ca2+ release of cells and participate in many processes, such as cell adhesion, differentiation, and apoptosis. However, its expression and function in osteocytes are still unclear. Materials and methods To determine the function of Pip5k1c in osteocytes, the expression of Pip5k1c in osteocytes was deleted by breeding the 10-kb mouse Dmp1-Cre transgenic mice with the Pip5k1cfl/fl mice. Bone histomorphometry, micro-computerized tomography analysis, immunofluorescence staining and western blotting were used to determine the effects of Pip5k1c loss on bone mass. In vitro, we explored the mechanism by siRNA knockdown of Pip5k1c in MLO-Y4 cells. Results Pip5k1c expression was decreased in osteocytes in senescent and osteoporotic tissues both in humans and mice. Loss of Pip5k1c in osteocytes led to a low bone mass in long bones and spines and impaired biomechanical properties in femur, without changes in calvariae. The loss of Pip5k1c resulted in the reduction of the protein level of type 1 collagen in tibiae and MLO-Y4 cells. Osteocyte Pip5k1c loss reduced the osteoblast and bone formation rate with high expression of sclerostin, impacting the osteoclast activities at the same time. Moreover, Pip5k1c loss in osteocytes reduced expression of focal adhesion proteins and promoted apoptosis. Conclusion Our studies demonstrate the critical role and mechanism of Pip5k1c in osteocytes in regulating bone remodeling. The translational potential of this article Osteocyte has been considered to a key role in regulating bone homeostasis. The present study has demonstrated that the significance of Pip5k1c in bone homeostasis by regulating the expression of collagen, sclerostin and focal adhesion expression, which provided a possible therapeutic target against human metabolic bone disease.
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Affiliation(s)
- Sixiong Lin
- Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Department of Spinal Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Chu Tao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Qinnan Yan
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Huanqing Gao
- State Key Laboratory of Genetic Engineering and School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Lei Qin
- Department of Orthopedics, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, 518000, China
| | - Yiming Zhong
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Qing Yao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Peijun Zhang
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Jiaming Yang
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
- Department of Orthopaedics & Traumatology, Stem Cells and Regenerative Medicine Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, China
| | - Xuenong Zou
- Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Department of Spinal Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China
| | - Guozhi Xiao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
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Oxman E, Li H, Wang HY, Zohn IE. Identification and functional analysis of rare HECTD1 missense variants in human neural tube defects. Hum Genet 2024; 143:263-277. [PMID: 38451291 PMCID: PMC11043113 DOI: 10.1007/s00439-024-02647-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 01/20/2024] [Indexed: 03/08/2024]
Abstract
Neural tube defects (NTDs) are severe malformations of the central nervous system that arise from failure of neural tube closure. HECTD1 is an E3 ubiquitin ligase required for cranial neural tube closure in mouse models. NTDs in the Hectd1 mutant mouse model are due to the failure of cranial mesenchyme morphogenesis during neural fold elevation. Our earlier research has linked increased extracellular heat shock protein 90 (eHSP90) secretion to aberrant cranial mesenchyme morphogenesis in the Hectd1 model. Furthermore, overexpression of HECTD1 suppresses stress-induced eHSP90 secretion in cell lines. In this study, we report the identification of five rare HECTD1 missense sequence variants in NTD cases. The variants were found through targeted next-generation sequencing in a Chinese cohort of 352 NTD cases and 224 ethnically matched controls. We present data showing that HECTD1 is a highly conserved gene, extremely intolerant to loss-of-function mutations and missense changes. To evaluate the functional consequences of NTD-associated missense variants, functional assays in HEK293T cells were performed to examine protein expression and the ability of HECTD1 sequence variants to suppress eHSP90 secretion. One NTD-associated variant (A1084T) had significantly reduced expression in HEK293T cells. All five NTD-associated variants (p.M392V, p.T801I, p.I906V, p.A1084T, and p.P1835L) reduced regulation of eHSP90 secretion by HECTD1, while a putative benign variant (p.P2474L) did not. These findings are the first association of HECTD1 sequence variation with NTDs in humans.
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Affiliation(s)
- Elias Oxman
- Center for Genetic Medicine Research, Children's Research Institute, Children's National Research and Innovation Campus, Children's National Hospital, Washington, DC, 20012, USA
| | - Huili Li
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO, 80309, USA
| | - Hong-Yan Wang
- Obstetrics and Gynecology Hospital, Institute of Reproduction and Development, State Key Laboratory of Genetic, Engineering at School of Life Sciences, Fudan University, Shanghai, 200011, China
| | - Irene E Zohn
- Center for Genetic Medicine Research, Children's Research Institute, Children's National Research and Innovation Campus, Children's National Hospital, Washington, DC, 20012, USA.
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Jin Y, Xue J. Lipid kinases PIP5Ks and PIP4Ks: potential drug targets for breast cancer. Front Oncol 2023; 13:1323897. [PMID: 38156113 PMCID: PMC10753794 DOI: 10.3389/fonc.2023.1323897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 11/29/2023] [Indexed: 12/30/2023] Open
Abstract
Phosphoinositides, a small group of lipids found in all cellular membranes, have recently garnered heightened attention due to their crucial roles in diverse biological processes and different diseases. Among these, phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2), the most abundant bis-phosphorylated phosphoinositide within the signaling system, stands notably connected to breast cancer. Not only does it serve as a key activator of the frequently altered phosphatidylinositol 3-kinase (PI3K) pathway in breast cancer, but also its conversion to phosphatidylinositol-3,4,5-triphosphate (PI(3,4,5)P3) is an important direction for breast cancer research. The generation and degradation of phosphoinositides intricately involve phosphoinositide kinases. PI(4,5)P2 generation emanates from the phosphorylation of PI4P or PI5P by two lipid kinase families: Type I phosphatidylinositol-4-phosphate 5-kinases (PIP5Ks) and Type II phosphatidylinositol-5-phosphate 4-kinases (PIP4Ks). In this comprehensive review, we focus on these two lipid kinases and delineate their compositions and respective cellular localization. Moreover, we shed light on the expression patterns and functions of distinct isoforms of these kinases in breast cancer. For a deeper understanding of their functional dynamics, we expound upon various mechanisms governing the regulation of PIP5Ks and PIP4Ks activities. A summary of effective and specific small molecule inhibitors designed for PIP5Ks or PIP4Ks are also provided. These growing evidences support PIP5Ks and PIP4Ks as promising drug targets for breast cancer.
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Affiliation(s)
- Yue Jin
- Department of Molecular Diagnosis, Northern Jiangsu People’s Hospital, Yangzhou University Clinical Medical College, Yangzhou, China
| | - Jian Xue
- Department of Emergency Medicine, Yizheng People’s Hospital, Yangzhou University Clinical Medical College, Yangzhou, China
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Jonas K, Prinz F, Ferracin M, Krajina K, Pasculli B, Deutsch A, Madl T, Rinner B, Slaby O, Klec C, Pichler M. MiR-4649-5p acts as a tumor-suppressive microRNA in triple negative breast cancer by direct interaction with PIP5K1C, thereby potentiating growth-inhibitory effects of the AKT inhibitor capivasertib. Breast Cancer Res 2023; 25:119. [PMID: 37803350 PMCID: PMC10559525 DOI: 10.1186/s13058-023-01716-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 09/20/2023] [Indexed: 10/08/2023] Open
Abstract
BACKGROUND Triple negative breast cancer (TNBC) is a particularly aggressive and difficult-to-treat subtype of breast cancer that requires the development of novel therapeutic strategies. To pave the way for such developments it is essential to characterize new molecular players in TNBC. MicroRNAs (miRNAs) constitute interesting candidates in this regard as they are frequently deregulated in cancer and contribute to numerous aspects of carcinogenesis. METHODS AND RESULTS Here, we discovered that miR-4649-5p, a miRNA yet uncharacterized in breast cancer, is associated with better overall survival of TNBC patients. Ectopic upregulation of the otherwise very low endogenous expression levels of miR-4646-5p significantly decreased the growth, proliferation, and migration of TNBC cells. By performing whole transcriptome analysis and physical interaction assays, we were able to identify the phosphatidylinositol phosphate kinase PIP5K1C as a direct target of miR-4649-5p. Downregulation or pharmacologic inhibition of PIP5K1C phenocopied the growth-reducing effects of miR-4649-5p. PIP5K1C is known to play an important role in migration and cell adhesion, and we could furthermore confirm its impact on downstream PI3K/AKT signaling. Combinations of miR-4649-5p upregulation and PIP5K1C or AKT inhibition, using the pharmacologic inhibitors UNC3230 and capivasertib, respectively, showed additive growth-reducing effects in TNBC cells. CONCLUSION In summary, miR-4649-5p exerts broad tumor-suppressive effects in TNBC and shows potential for combined therapeutic approaches targeting the PIP5K1C/PI3K/AKT signaling axis.
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Affiliation(s)
- Katharina Jonas
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
- Research Unit for Non-Coding RNA and Genome Editing in Cancer, Medical University of Graz, Graz, Austria
| | - Felix Prinz
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
- Research Unit for Non-Coding RNA and Genome Editing in Cancer, Medical University of Graz, Graz, Austria
| | - Manuela Ferracin
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Katarina Krajina
- Translational Oncology, II. Med Clinics Hematology and Oncology, Augsburg, Germany
| | - Barbara Pasculli
- Fondazione IRCCS Casa Sollievo della Sofferenza Laboratorio di Oncologia, San Giovanni Rotondo, FG, Italy
| | - Alexander Deutsch
- Division of Hematology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Tobias Madl
- Division of Molecular Biology and Biochemistry, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Medical University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Beate Rinner
- Department for Biomedical Research, Medical University of Graz, Graz, Austria
| | - Ondrej Slaby
- Department of Biology, Faculty of Medicine and Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Christiane Klec
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
- Research Unit for Non-Coding RNA and Genome Editing in Cancer, Medical University of Graz, Graz, Austria
| | - Martin Pichler
- Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.
- Research Unit for Non-Coding RNA and Genome Editing in Cancer, Medical University of Graz, Graz, Austria.
- Translational Oncology, II. Med Clinics Hematology and Oncology, Augsburg, Germany.
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Vaughan N, Scholz N, Lindon C, Licchesi JDF. The E3 ubiquitin ligase HECTD1 contributes to cell proliferation through an effect on mitosis. Sci Rep 2022; 12:13160. [PMID: 35915203 DOI: 10.1038/s41598-022-16965-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 07/19/2022] [Indexed: 11/26/2022] Open
Abstract
The cell cycle is tightly regulated by protein phosphorylation and ubiquitylation events. During mitosis, the multi-subunit cullin-RING E3 ubiquitin ligase APC/c functions as a molecular switch which signals for one cell to divide into two daughter cells, through the ubiquitylation and proteasomal degradation of mitotic cyclins. The contributions of other E3 ligase families during cell cycle progression remain less well understood. Similarly, the roles of ubiquitin chain types beyond homotypic K48 chains in S-phase or branched K11/K48 chains during mitosis, also remain to be fully determined. Our recent findings that HECTD1 ubiquitin ligase activity assembles branched K29/K48 ubiquitin linkages prompted us to evaluate HECTD1 function during the cell cycle. We used transient knockdown and genetic knockout to show that HECTD1 depletion in HEK293T and HeLa cells decreases cell number and we established that this is mediated through loss of ubiquitin ligase activity. Interestingly, we found that HECTD1 depletion increases the proportion of cells with aligned chromosomes (Prometa/Metaphase) and we confirmed this molecularly using phospho-Histone H3 (Ser28) as a marker of mitosis. Time-lapse microscopy of NEBD to anaphase onset established that HECTD1-depleted cells take on average longer to go through mitosis. In line with this data, HECTD1 depletion reduced the activity of the Spindle Assembly Checkpoint, and BUB3, a component of the Mitosis Checkpoint Complex, was identified as novel HECTD1 interactor. BUB3, BUBR1 or MAD2 protein levels remained unchanged in HECTD1-depleted cells. Overall, this study reveals a novel putative role for HECTD1 during mitosis and warrants further work to elucidate the mechanisms involved.
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Abstract
Atherosclerosis is the major cause of coronary artery disease (CAD) which includes unstable angina, myocardial infarction, and heart failure. The onset of atherogenesis, a process of atherosclerotic lesion formation in the intima of arteries, is driven by lipid accumulation, a vicious cycle of reactive oxygen species (ROS)-induced oxidative stress and inflammatory reactions leading to endothelial cell (EC) dysfunction, vascular smooth muscle cell (VSMC) activation, and foam cell formation which further fuel plaque formation and destabilization. In recent years, there is a surge in the number of publications reporting the involvement of circular RNAs (circRNAs) in the pathogenesis of cardiovascular diseases, cancers, and metabolic syndromes. These studies have advanced our understanding on the biological functions of circRNAs. One of the most common mechanism of action of circRNAs reported is the sponging of microRNAs (miRNAs) by binding to the miRNAs response element (MRE), thereby indirectly increases the transcription of their target messenger RNAs (mRNAs). Individual networks of circRNA-miRNA-mRNA associated with atherogenesis have been extensively reported, however, there is a need to connect these findings for a complete overview. This review aims to provide an update on atherogenesis-related circRNAs and analyze the circRNA-miRNA-mRNA interactions in atherogenesis. The atherogenic mechanisms and clinical relevance of each atherogenesis-related circRNA were systematically discussed for better understanding of the knowledge gap in this area.
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Affiliation(s)
- Kind-Leng Tong
- Department of Pharmacology, Faculty of Medicine, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Ke-En Tan
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Yat-Yuen Lim
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Xin-Yi Tien
- Department of Pharmacology, Faculty of Medicine, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Pooi-Fong Wong
- Department of Pharmacology, Faculty of Medicine, Universiti Malaya, 50603, Kuala Lumpur, Malaysia.
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Uemoto Y, Katsuta E, Kondo N, Wanifuchi-Endo Y, Fujita T, Asano T, Hisada T, Terada M, Kato A, Okuda K, Sugiura H, Komura M, Kato H, Osaga S, Takahashi S, Toyama T. Low HECTD1 mRNA expression is associated with poor prognosis and may be correlated with increased mitochondrial respiratory function in breast cancer. Am J Cancer Res 2022; 12:1593-1605. [PMID: 35530276 PMCID: PMC9077061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023] Open
Abstract
HECT domain E3 ubiquitin ligase 1 (HECTD1) has been reported to be a negative regulator of epithelial-mesenchymal transition and to decrease breast cancer invasion and metastasis. However, the clinical significance and detailed role of HECTD1 in breast cancer remain elusive. We investigated the role of HECTD1 in two large breast cancer cohorts at our institution and The Cancer Genome Atlas using mRNA expression and bioinformatics analysis. We also examined the prognostic significance of HECTD1 mRNA expression by multivariate analysis and HECTD1 protein expression by immunohistochemistry using our cohort. HECTD1 mRNA expression was significantly lower in breast cancer tissues compared with those in adjacent normal tissues (P<0.001). HECTD1 mRNA expression levels also differed among breast cancer subtypes. Decreased HECTD1 mRNA expression was significantly associated with aggressive tumor characteristics, including large tumor size and high histological grade. HECTD1 mRNA expression was inversely associated with mitochondrial cellular respiratory function (oxidative phosphorylation (P<0.001, FDR q-value <0.001) the respiratory chain complex (P<0.001, FDR q-value <0.001) and reactive oxygen species (P<0.001, FDR q-value <0.001), but not with epithelial-mesenchymal transition, in breast cancer tissues. Low expression of HECTD1 mRNA was associated with shorter disease-free survival (log-rank: P=0.013) and overall survival (log-rank: P=0.038) in breast cancer patients. Multivariate analysis also identified low HECTD1 mRNA expression level as an independent risk factor for disease-free (hazard ratio: 1.54, 95% confidence interval: 1.11-2.13, P=0.009) and overall (hazard ratio: 1.50, 95% confidence interval: 1.01-2.24, P=0.046) survival among breast cancer patients. There was no association of HECTD1 protein expression with HECTD1 mRNA expression and prognosis. In conclusion, we identified low expression of HECTD1 mRNA as an independent poor prognostic factor in breast cancer and showed that HECTD1 mRNA expression was inversely correlated with genes involved in mitochondrial cellular respiratory function in breast cancer.
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Affiliation(s)
- Yasuaki Uemoto
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Eriko Katsuta
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer CenterBuffalo, NY, USA
| | - Naoto Kondo
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Yumi Wanifuchi-Endo
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Takashi Fujita
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Tomoko Asano
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Tomoka Hisada
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Mitsuo Terada
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Akiko Kato
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Katsuhiro Okuda
- Department of Oncology, Immunology and Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Hiroshi Sugiura
- Department of Education and Research Center for Advanced Medicine, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Masayuki Komura
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Hiroyuki Kato
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Satoshi Osaga
- Clinical Research Management Center, Nagoya City University HospitalNagoya, Aichi, Japan
| | - Satoru Takahashi
- Department of Experimental Pathology and Tumor Biology, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
| | - Tatsuya Toyama
- Department of Breast Surgery, Nagoya City University Graduate School of Medical SciencesNagoya, Aichi, Japan
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Frey Y, Franz-Wachtel M, Macek B, Olayioye MA. Proteasomal turnover of the RhoGAP tumor suppressor DLC1 is regulated by HECTD1 and USP7. Sci Rep 2022; 12:5036. [PMID: 35322810 PMCID: PMC8943137 DOI: 10.1038/s41598-022-08844-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 03/09/2022] [Indexed: 11/16/2022] Open
Abstract
The Rho GTPase activating protein Deleted in Liver Cancer 1 (DLC1) is frequently downregulated through genetic and epigenetic mechanisms in various malignancies, leading to aberrant Rho GTPase signaling and thus facilitating cancer progression. Here we show that in breast cancer cells, dysregulation of DLC1 expression occurs at the protein level through rapid degradation via the ubiquitin–proteasome system. Using mass spectrometry, we identify two novel DLC1 interaction partners, the ubiquitin-ligase HECTD1 and the deubiquitinating enzyme ubiquitin-specific-processing protease 7 (USP7). While DLC1 protein expression was rapidly downregulated upon pharmacological inhibition of USP7, siRNA-mediated knockdown of HECTD1 increased DLC1 protein levels and impaired its degradation. Immunofluorescence microscopy analyses revealed that the modulation of HECTD1 levels and USP7 activity altered DLC1 abundance at focal adhesions, its primary site of action. Thus, we propose opposing regulatory mechanisms of DLC1 protein homeostasis by USP7 and HECTD1, which could open up strategies to counteract downregulation and restore DLC1 expression in cancer.
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Affiliation(s)
- Yannick Frey
- Institute of Cell Biology and Immunology, University of Stuttgart, Allmandring 31, 70569, Stuttgart, Germany
| | - Mirita Franz-Wachtel
- Proteome Center Tübingen, University of Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany
| | - Boris Macek
- Proteome Center Tübingen, University of Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany
| | - Monilola A Olayioye
- Institute of Cell Biology and Immunology, University of Stuttgart, Allmandring 31, 70569, Stuttgart, Germany. .,Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, 70569, Stuttgart, Germany.
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Huang G, Yang C, Guo S, Huang M, Deng L, Huang Y, Chen P, Chen F, Huang X. Adipocyte-specific deletion of PIP5K1c reduces diet-induced obesity and insulin resistance by increasing energy expenditure. Lipids Health Dis 2022; 21:6. [PMID: 34996482 PMCID: PMC8742433 DOI: 10.1186/s12944-021-01616-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 12/17/2021] [Indexed: 12/23/2022] Open
Abstract
Background Phosphatidylinositol 4-phosphate 5-kinase type I c (PIP5K1c) catalyses the synthesis of phospholipid phosphatidylinositol 4,5-bisphosphate (PIP2) by phosphorylating phosphatidylinositol 4 phosphate, which plays multiple roles in regulating focal adhesion formation, invasion, and cell migration signal transduction cascades. Here, a new physiological mechanism of PIP5K1c in adipocytes and systemic metabolism is reported. Methods Adipose-specific conditional knockout mice were generated to delete the PIP5K1c gene in adipocytes. In addition, in vitro research investigated the effect of PIP5K1c deletion on adipogenesis. Results Deletion of PIP5K1c in adipocytes significantly alleviated high fat diet (HFD)-induced obesity, hyperlipidaemia, hepatic steatosis, and insulin resistance. PIP5K1c deficiency in adipocytes also decreased adipocyte volume in HFD-induced obese mice, whereas no significant differences were observed in body weight and adipose tissue weight under normal chow diet conditions. PIP5K1c knockout in adipocytes significantly enhanced energy expenditure, which protected mice from HFD-induced weight gain. In addition, adipogenesis was markedly impaired in mouse stromal vascular fraction (SVF) from PIP5K1c-deleted mice. Conclusion Under HFD conditions, PIP5K1c regulates adipogenesis and adipose tissue homeostasis. Together, these data indicate that PIP5K1c could be a novel potential target for regulating fat accumulation, which could provide novel insight into the treatment of obesity. Supplementary Information The online version contains supplementary material available at 10.1186/s12944-021-01616-4.
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Affiliation(s)
- Guan Huang
- Department of Pathology, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Cuishan Yang
- Department of Nursing, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Sheng Guo
- Department of Medical Administration, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Miaoling Huang
- Department of Metabolism and Endocrinology, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Liping Deng
- Department of Metabolism and Endocrinology, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Ying Huang
- Department of Metabolism and Endocrinology, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Puxin Chen
- Department of Metabolism and Endocrinology, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China
| | - Feng Chen
- Department of Plastic Surgy, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine; Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China.
| | - Xiaohong Huang
- Department of Nursing, Shenzhen Clinical Medical College, Guangzhou University of Chinese Medicine, Longgang District Central Hospital of Shenzhen, Shenzhen, 518116, Guangdong, China.
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Tang Y, Zhou M, Huang R, Shen L, Yang L, Zhou Z, Ren H, Bai Y. Involvement of HECTD1 in LPS-induced astrocyte activation via σ-1R-JNK/p38-FOXJ2 axis. Cell Biosci 2021; 11:62. [PMID: 33781347 DOI: 10.1186/s13578-021-00572-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 03/12/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Astrocytes participate in innate inflammatory responses within the mammalian central nervous system (CNS). HECT domain E3 ubiquitin protein ligase 1 (HECTD1) functions during microglial activation, suggesting a connection with neuroinflammation. However, the potential role of HECTD1 in astrocytes remains largely unknown. RESULTS Here, we demonstrated that HECTD1 was upregulated in primary mouse astrocytes after 100 ng/ml lipopolysaccharide (LPS) treatment. Genetic knockdown of HECTD1 in vitro or astrocyte-specific knockdown of HECTD1 in vivo suppressed LPS-induced astrocyte activation, whereas overexpression of HECTD1 in vitro facilitated LPS-induced astrocyte activation. Mechanistically, we established that LPS activated σ-1R-JNK/p38 pathway, and σ-1R antagonist BD1047, JNK inhibitor SP600125, or p38 inhibitor SB203580 reversed LPS-induced expression of HECTD1, thus restored LPS-induced astrocyte activation. In addition, FOXJ2 functioned as a transcription factor of HECTD1, and pretreatment of primary mouse astrocytes with BD1047, SB203580, and SP600125 significantly inhibited LPS-mediated translocation of FOXJ2 into the nucleus. CONCLUSIONS Overall, our present findings suggest that HECTD1 participates in LPS-induced astrocyte activation by activation of σ-1R-JNK/p38-FOXJ2 pathway and provide a potential therapeutic strategy for neuroinflammation induced by LPS or any other neuroinflammatory disorders.
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11
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Singh S, Ng J, Sivaraman J. Exploring the "Other" subfamily of HECT E3-ligases for therapeutic intervention. Pharmacol Ther 2021; 224:107809. [PMID: 33607149 DOI: 10.1016/j.pharmthera.2021.107809] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/13/2020] [Accepted: 01/26/2021] [Indexed: 12/14/2022]
Abstract
The HECT E3 ligase family regulates key cellular signaling pathways, with its 28 members divided into three subfamilies: NEDD4 subfamily (9 members), HERC subfamily (6 members) and "Other" subfamily (13 members). Here, we focus on the less-explored "Other" subfamily and discuss the recent findings pertaining to their biological roles. The N-terminal regions preceding the conserved HECT domains are significantly diverse in length and sequence composition, and are mostly unstructured, except for short regions that incorporate known substrate-binding domains. In some of the better-characterized "Other" members (e.g., HUWE1, AREL1 and UBE3C), structure analysis shows that the extended region (~ aa 50) adjacent to the HECT domain affects the stability and activity of the protein. The enzymatic activity is also influenced by interactions with different adaptor proteins and inter/intramolecular interactions. Primarily, the "Other" subfamily members assemble atypical ubiquitin linkages, with some cooperating with E3 ligases from the other subfamilies to form branched ubiquitin chains on substrates. Viruses and pathogenic bacteria target and hijack the activities of "Other" subfamily members to evade host immune responses and cause diseases. As such, these HECT E3 ligases have emerged as potential candidates for therapeutic drug development.
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Affiliation(s)
- Sunil Singh
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, 117543, Singapore
| | - Joel Ng
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, 117543, Singapore
| | - J Sivaraman
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, 117543, Singapore.
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12
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Lu G, Zhou B, He Y, Liu H, Luo S, Amos CI, Lee JE, Yang K, Qureshi A, Han J, Wei Q. Novel genetic variants of PIP5K1C and MVB12B of the endosome-related pathway predict cutaneous melanoma-specific survival. Am J Cancer Res 2020; 10:3382-3394. [PMID: 33163277 PMCID: PMC7642651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023] Open
Abstract
Endosomes regulate cell polarity, adhesion, signaling, immunity, and tumor progression, which may influence cancer outcomes. Here we evaluated associations between 36,068 genetic variants of 228 endosome-related pathway genes and cutaneous melanoma disease-specific survival (CMSS) using genotyping data from two previously published genome-wide association studies. The discovery dataset included 858 CM patients with 95 deaths from The University of Texas MD Anderson Cancer Center, and the replication dataset included 409 CM patients with 48 deaths from the Nurses' Health Study (NHS) and the Health Professionals Follow-up Study (HPFS). In multivariate Cox proportional hazards regression analysis, we found that two novel SNPs (PIP5K1C rs11666894 A>C and MVB12B rs12376285 C>T) predicted CMSS, with adjusted hazards ratios of 1.47 (95% confidence interval = 1.15-1.89 and P = 0.002) and 1.73 (1.30-2.31 and 0.0002), respectively. Combined analysis of risk genotypes of these two SNPs revealed a dose-dependent decrease in CMSS associated with an increased number of risk genotypes (P trend = 0.0002). Subsequent expression quantitative trait loci (eQTL) analysis revealed that PIP5K1C rs11666894 was associated with mRNA expression levels in lymphoblastoid cell lines from 373 European descendants (P<0.0001) and that MVB12B rs12376285 was associated with mRNA expression levels in cultured fibroblasts from 605 European-Americans (P<0.0001). Our findings suggest that novel genetic variants of PIP5K1C and MVB12B in the endosome-related pathway genes may be promising prognostic biomarkers for CMSS, but these results need to be validated in future larger studies.
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Affiliation(s)
- Guiqing Lu
- Department of Dermatology, BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical UniversityNanjing 210019, Jiangsu, China
- Duke Cancer Institute, Duke University Medical CenterDurham, NC 27710, USA
- Department of Population Health Sciences, Duke University School of MedicineDurham, NC 27710, USA
| | - Bingrong Zhou
- Duke Cancer Institute, Duke University Medical CenterDurham, NC 27710, USA
- Department of Population Health Sciences, Duke University School of MedicineDurham, NC 27710, USA
| | - Yuanmin He
- Duke Cancer Institute, Duke University Medical CenterDurham, NC 27710, USA
- Department of Population Health Sciences, Duke University School of MedicineDurham, NC 27710, USA
| | - Hongliang Liu
- Duke Cancer Institute, Duke University Medical CenterDurham, NC 27710, USA
- Department of Population Health Sciences, Duke University School of MedicineDurham, NC 27710, USA
| | - Sheng Luo
- Department of Biostatistics and Bioinformatics, Duke University School of MedicineDurham, NC 27710, USA
| | - Christopher I Amos
- Institute for Clinical and Translational Research, Baylor College of MedicineHouston, TX 77030, USA
| | - Jeffrey E Lee
- Department of Surgical Oncology, The University of Texas M.D. Anderson Cancer CenterHouston, TX 77030, USA
| | - Keming Yang
- Department of Nutrition, Harvard T.H. Chan School of Public HealthBoston, MA, USA
| | - Abrar Qureshi
- Department of Dermatology, Warren Alpert Medical School, Brown UniversityProvidence, RI 02903, USA
| | - Jiali Han
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s HospitalBoston, MA 02115, USA
- Department of Epidemiology, Fairbanks School of Public Health, Indiana UniversityIndianapolis, IN 46202, USA
| | - Qingyi Wei
- Duke Cancer Institute, Duke University Medical CenterDurham, NC 27710, USA
- Department of Population Health Sciences, Duke University School of MedicineDurham, NC 27710, USA
- Department of Medicine, Duke University School of MedicineDurham, NC 27710, USA
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13
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Zhou Y, Cheng X, Yang Y, Li T, Li J, Huang THM, Wang J, Lin S, Jin VX. Modeling and analysis of Hi-C data by HiSIF identifies characteristic promoter-distal loops. Genome Med 2020; 12:69. [PMID: 32787954 PMCID: PMC7425017 DOI: 10.1186/s13073-020-00769-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 07/28/2020] [Indexed: 01/04/2023] Open
Abstract
Current computational methods on Hi-C analysis focused on identifying Mb-size domains often failed to unveil the underlying functional and mechanistic relationship of chromatin structure and gene regulation. We developed a novel computational method HiSIF to identify genome-wide interacting loci. We illustrated HiSIF outperformed other tools for identifying chromatin loops. We applied it to Hi-C data in breast cancer cells and identified 21 genes with gained loops showing worse relapse-free survival in endocrine-treated patients, suggesting the genes with enhanced loops can be used for prognostic signatures for measuring the outcome of the endocrine treatment. HiSIF is available at https://github.com/yufanzhouonline/HiSIF .
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Affiliation(s)
- Yufan Zhou
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Xiaolong Cheng
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Yini Yang
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Tian Li
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Jingwei Li
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Tim H-M Huang
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Junbai Wang
- Department of Pathology, Oslo University Hospital - Norwegian Radium Hospital, Montebello, 0310, Oslo, Norway
| | - Shili Lin
- Department of Statistics, The Ohio State University, Columbus, OH, 43210, USA
| | - Victor X Jin
- Department of Molecular Medicine, University of Texas Health San Antonio, San Antonio, TX, 78229, USA.
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14
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Rangarajan ES, Primi MC, Colgan LA, Chinthalapudi K, Yasuda R, Izard T. A distinct talin2 structure directs isoform specificity in cell adhesion. J Biol Chem 2020; 295:12885-12899. [PMID: 32605925 DOI: 10.1074/jbc.ra119.010789] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 06/23/2020] [Indexed: 01/25/2023] Open
Abstract
Integrin receptors regulate normal cellular processes such as signaling, cell migration, adhesion to the extracellular matrix, and leukocyte function. Talin recruitment to the membrane is necessary for its binding to and activation of integrin. Vertebrates have two highly conserved talin homologs that differ in their expression patterns. The F1-F3 FERM subdomains of cytoskeletal proteins resemble a cloverleaf, but in talin1, its F1 subdomain and additional F0 subdomain align more linearly with its F2 and F3 subdomains. Here, we present the talin2 crystal structure, revealing that its F0-F1 di-subdomain displays another unprecedented constellation, whereby the F0-F1-F2 adopts a new cloverleaf-like arrangement. Using multiangle light scattering (MALS), fluorescence lifetime imaging (FLIM), and FRET analyses, we found that substituting the corresponding residues in talin2 that abolish lipid binding in talin1 disrupt the binding of talin to the membrane, focal adhesion formation, and cell spreading. Our results provide the molecular details of the functions of specific talin isoforms in cell adhesion.
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Affiliation(s)
- Erumbi S Rangarajan
- Cell Adhesion Laboratory, Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Marina C Primi
- Cell Adhesion Laboratory, Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Lesley A Colgan
- Neuronal Signal Transduction, Max Planck Florida Institute for Neuroscience, Jupiter, Florida, USA
| | - Krishna Chinthalapudi
- Cell Adhesion Laboratory, Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA
| | - Ryohei Yasuda
- Neuronal Signal Transduction, Max Planck Florida Institute for Neuroscience, Jupiter, Florida, USA
| | - Tina Izard
- Cell Adhesion Laboratory, Department of Integrative Structural and Computational Biology, The Scripps Research Institute, Jupiter, Florida, USA.
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15
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Chu H, Wang W, Luo W, Zhang W, Cheng Y, Huang J, Wang J, Dai X, Fang S, Chao J. CircHECTD1 mediates pulmonary fibroblast activation via HECTD1. Ther Adv Chronic Dis 2019; 10:2040622319891558. [PMID: 31832126 PMCID: PMC6887829 DOI: 10.1177/2040622319891558] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 11/04/2019] [Indexed: 11/16/2022] Open
Abstract
Background: Circular RNA (circRNA), a new class of noncoding RNA, has been shown to be important in silicosis due to its unique role as a transcription regulator or as a sponge of small RNA regulators. Here, the mechanisms underlying circHECTD1/HECTD1 in fibroblast activation and subsequent fibrosis induced by SiO2 were investigated. Methods: Primary human pulmonary fibroblasts (HPF-a) were utilized, combined with quantitative real-time PCR (qRT-PCR) and fluorescence in situ hybridization (FISH) assays. LC3B-LV-RFP lentivirus was used to evaluate the role of autophagy. The CRISPR/Cas9 system was applied to specifically knock down HECTD1, combined with MTT, BrdU, and migration assays, to explore the functional changes induced by SiO2. Results: After exposure to SiO2, the circHECTD1 level was decreased, which was associated with an increase in HECTD1 in HPF-a cells. SiO2-induced autophagy was reversed by either circHECTD1 overexpression or HECTD1 knockdown in HPF-a cells, with restored SiO2-induced fibroblast activation, proliferation, and migration via downstream autophagy. The lungs of mice exposed to SiO2 confirmed the upregulation of HECTD1 in pulmonary fibroblasts. Conclusions: Our data suggested a link between circHECTD1/HECTD1 and fibroblast activation with subsequent fibrosis induced by SiO2, providing novel insight into the potential of circHECTD1/HECTD1 to be a therapeutic target for silicosis.
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Affiliation(s)
- Han Chu
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Wei Wang
- Department of Respiratory Medicine, Nanjing Chest Hospital, Nanjing, Jiangsu, China
| | - Wei Luo
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Wei Zhang
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Yusi Cheng
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Jie Huang
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Jing Wang
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Xiaoniu Dai
- Department of Physiology, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Shencun Fang
- Department of Respiratory Medicine, Nanjing Chest Hospital, Nanjing, Jiangsu, China
| | - Jie Chao
- Department of Physiology, School of Medicine, Southeast University, 87 Dingjiaqiao Road, Nanjing, Jiangsu, 210009, China
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16
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Chen L, Luo W, Zhang W, Chu H, Wang J, Dai X, Cheng Y, Zhu T, Chao J. circDLPAG4/HECTD1 mediates ischaemia/reperfusion injury in endothelial cells via ER stress. RNA Biol 2019; 17:240-253. [PMID: 31607223 DOI: 10.1080/15476286.2019.1676114] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Background: Vascular endothelial cell dysfunction, characterized by cell apoptosis and migration, plays a crucial role in ischaemia/reperfusion (I/R) injury, a common aspect of cardiovascular diseases. Recent studies have suggested that non-coding RNAs, such as circular RNAs (circRNA), play a role in cell dysfunction in I/R injury, although the detailed mechanism is unclear.Methods: Human umbilical vein endothelial cells (HUVECs) were used for in vitro I/R model. Protein expression was detected by western blotting (WB) and immunocytochemistry. The CRISPR/Cas9 system, WB, cell viability assays, Hoechst staining and a 3D migration model were used to explore functional changes. RNA expression was evaluated using quantitative real-time PCR and a FISH assay combined with lentivirus transfection regulating circRNAs and miRNAs. A mouse myocardial I/R model using C57 mice was established to confirm the in vitro findings.Results: In HUVECs, I/R induced a significant time-dependent decrease in HECTD1 associated with an approximately 45% decrease in cell viability and increases in cell apoptosis and migration, which were attenuated by HECTD1 overexpression. I/R-induced upregulation of endoplasmic reticulum stress was also attenuated HECTD1 overexpression. Moreover, miR-143 mimics inhibited HECTD1 expression, which was restored by circDLGAP4 overexpression, providing insight as to the molecular mechanism of I/R-induced HECTD1 in endothelial cell dysfunction.Conclusion: Our results suggest a critical role for circDLGAP4 and HECTD1 in endothelial cell dysfunction induced by I/R, providing novel insight into potential therapeutic targets for the treatment of myocardial ischaemia.
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Affiliation(s)
- Lulu Chen
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China.,Department of Cardiology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Wei Luo
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Wei Zhang
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Han Chu
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Jing Wang
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Xiaoniu Dai
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Yusi Cheng
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China
| | - Tiebing Zhu
- Department of Cardiology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Jie Chao
- Department of Physiology, Medical School of Southeast University, Nanjing, Jiangsu, China.,Key Laboratory of Developmental Genes and Human Disease, Institute of Life Sciences, Southeast University, Nanjing, Jiangsu, China.,Department of Respiration, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
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17
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D'Alonzo D, Emch FH, Shen X, Bruder E, De Geyter C, Zhang H. Hectd1 is essential for embryogenesis in mice. Gene Expr Patterns 2019; 34:119064. [PMID: 31301385 DOI: 10.1016/j.gep.2019.119064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 07/08/2019] [Accepted: 07/08/2019] [Indexed: 12/17/2022]
Abstract
Many aspects of the functional role of the E3 ubiquitin ligase Hectd1 in embryogenesis and in cell biology still remain to be elucidated. In order to contribute to this task we now report the generation of a new transgenic mouse model for Hectd1 using the gene trap strategy. The HECT domain deletion mutant mouse was created by inserting a β-geo cassette into the Hectd1 locus. Mice homozygous for Hectd1-mutant showed early embryonic lethality with abnormal placental development and defective of neural tube closure resulting in exencephaly. The thickness of the placenta of both Hectd1-mutant homozygous and heterozygous mice was distinctly thinner than that of wildtype mice, the difference being most pronounced in the labyrinth layer of the placenta. We also addressed the temporal and spatial expression profiles of Hectd1 in adult tissues by X-gal staining. Hectd1 expression was detected in specific cell populations of most but not all tissues of the adult organism. Furthermore, the expression of Hectd1 was regulated by insulin and by both heat and hypoxia. Thus, our studies reveal that Hectd1 is indispensable for normal embryogenesis and fetal survival. The generation of this new Hectd1 mutant mouse model provides ample opportunities to study the function of Hectd1 in mammalian cells in detail.
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Affiliation(s)
- Donato D'Alonzo
- Department of Biomedicine, University Hospital, University of Basel, Hebelstrasse 20, CH-4031, Basel, Switzerland
| | - Fabienne Hélène Emch
- Clinic of Gynecological Endocrinology and Reproductive Medicine, University Hospital, University of Basel, Spitalstrasse 21, CH-4031, Basel, Switzerland
| | - Xiaoli Shen
- Clinic of Gynecological Endocrinology and Reproductive Medicine, University Hospital, University of Basel, Spitalstrasse 21, CH-4031, Basel, Switzerland; Chongqing Reproductive and Genetics Institute, 64 Jing Tang ST, Yu Zhong District, Chongqing, 400013, PR China
| | - Elisabeth Bruder
- Institute of Pathology, University Hospital, University of Basel, Schönbeinstrasse 40, CH-4031, Basel, Switzerland
| | - Christian De Geyter
- Department of Biomedicine, University Hospital, University of Basel, Hebelstrasse 20, CH-4031, Basel, Switzerland; Clinic of Gynecological Endocrinology and Reproductive Medicine, University Hospital, University of Basel, Spitalstrasse 21, CH-4031, Basel, Switzerland
| | - Hong Zhang
- Department of Biomedicine, University Hospital, University of Basel, Hebelstrasse 20, CH-4031, Basel, Switzerland.
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18
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Sugrue KF, Sarkar AA, Leatherbury L, Zohn IE. The ubiquitin ligase HECTD1 promotes retinoic acid signaling required for development of the aortic arch. Dis Model Mech 2019; 12:dmm.036491. [PMID: 30578278 PMCID: PMC6361158 DOI: 10.1242/dmm.036491] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 12/10/2018] [Indexed: 12/16/2022] Open
Abstract
The development of the aortic arch is a complex process that involves remodeling of the bilaterally symmetrical pharyngeal arch arteries (PAAs) into the mature asymmetric aortic arch. Retinoic acid signaling is a key regulator of this process by directing patterning of the second heart field (SHF), formation of the caudal PAAs and subsequent remodeling of the PAAs to form the aortic arch. Here, we identify the HECTD1 ubiquitin ligase as a novel modulator of retinoic acid signaling during this process. Hectd1opm/opm homozygous mutant embryos show a spectrum of aortic arch abnormalities that occur following loss of 4th PAAs and increased SHF marker expression. This sequence of defects is similar to phenotypes observed in mutant mouse models with reduced retinoic acid signaling. Importantly, HECTD1 binds to and influences ubiquitination of the retinoic acid receptor, alpha (RARA). Furthermore, reduced activation of a retinoic acid response element (RARE) reporter is detected in Hectd1 mutant cells and embryos. Interestingly, Hectd1opm/+ heterozygous embryos exhibit reduced retinoic acid signaling, along with intermediate increased expression of SHF markers; however, heterozygotes show normal development of the aortic arch. Decreasing retinoic acid synthesis by reducing Raldh2 (also known as Aldh1a2) gene dosage in Hectd1opm/+ heterozygous embryos reveals a genetic interaction. Double heterozygous embryos show hypoplasia of the 4th PAA and increased incidence of a benign aortic arch variant, in which the transverse arch between the brachiocephalic and left common carotid arteries is shortened. Together, our data establish that HECTD1 is a novel regulator of retinoic acid signaling required for proper aortic arch development. Editor's choice: The HECTD1 ubiquitin ligase is a novel modulator of retinoic acid signaling during aortic arch development and provides a model for complex interactions underlying variations in aortic arch development.
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Affiliation(s)
- Kelsey F Sugrue
- Institute for Biomedical Sciences, The George Washington University, Washington, DC 20037, USA.,Center for Genetic Medicine Research, Children's National Health System, Washington, DC 20010, USA
| | - Anjali A Sarkar
- Center for Genetic Medicine Research, Children's National Health System, Washington, DC 20010, USA
| | - Linda Leatherbury
- Children's National Heart Institute, Children's National Health System, George Washington University School of Medicine, Washington, DC 20010, USA
| | - Irene E Zohn
- Center for Genetic Medicine Research, Children's National Health System, Washington, DC 20010, USA
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19
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Durand N, Borges S, Hall T, Bastea L, Döppler H, Edenfield BH, Thompson EA, Geiger X, Storz P. The phosphorylation status of PIP5K1C at serine 448 can be predictive for invasive ductal carcinoma of the breast. Oncotarget 2018; 9:36358-36370. [PMID: 30555634 PMCID: PMC6284740 DOI: 10.18632/oncotarget.26357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Accepted: 10/31/2018] [Indexed: 11/25/2022] Open
Abstract
Phosphatidylinositol-4-phosphate 5-kinase type-1C (PIP5K1C) is a lipid kinase that regulates focal adhesion dynamics and cell attachment through site-specific formation of phosphatidylinositol-4,5-bisphosphate (PI4,5P2). By comparing normal breast tissue to carcinoma in situ and invasive ductal carcinoma subtypes, we here show that the phosphorylation status of PIP5K1C at serine residue 448 (S448) can be predictive for breast cancer progression to an aggressive phenotype, while PIP5K1C expression levels are not indicative for this event. PIP5K1C phosphorylation at S448 is downregulated in invasive ductal carcinoma, and similarly, the expression levels of PKD1, the kinase that phosphorylates PIP5K1C at this site, are decreased. Overall, since PKD1 is a negative regulator of cell migration and invasion in breast cancer, the phosphorylation status of this residue may serve as an indicator of aggressiveness of breast tumors.
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Affiliation(s)
- Nisha Durand
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Sahra Borges
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Tavia Hall
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Ligia Bastea
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Heike Döppler
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Brandy H Edenfield
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | - E Aubrey Thompson
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
| | | | - Peter Storz
- Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Mayo Clinic, Jacksonville, FL 32224, USA
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20
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Li L, Kołodziej T, Jafari N, Chen J, Zhu H, Rajfur Z, Huang C. Cdk5-mediated phosphorylation regulates phosphatidylinositol 4-phosphate 5-kinase type I γ 90 activity and cell invasion. FASEB J 2018; 33:631-642. [PMID: 30040488 DOI: 10.1096/fj.201800296r] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Phosphatidylinositol 4-phosphate 5-kinase type I γ (PIPKIγ90) regulates cell migration, invasion, and metastasis. However, it is unknown how cellular signals regulate those processes. Here, we show that cyclin-dependent kinase 5 (Cdk5), a protein kinase that regulates cell migration and invasion, phosphorylates PIPKIγ90 at S453, and that Cdk5-mediated PIPKIγ90 phosphorylation is essential for cell invasion. Moreover, Cdk5-mediated phosphorylation down-regulates the activity of PIPKIγ90 and the secretion of fibronectin, an extracellular matrix protein that regulates cell migration and invasion. Furthermore, inhibition of PIPKIγ activity with the chemical inhibitor UNC3230 suppresses fibronectin secretion in a dose-dependent manner, whereas depletion of Cdk5 enhances fibronectin secretion. With total internal reflection fluorescence microscopy, we found that secreted fibronectin appears as round dots, which colocalize with Tks5 and CD9 but not with Zyxin. These data suggest that Cdk5-mediated PIPKIγ90 phosphorylation regulates cell invasion by controlling PIPKIγ90 activity and fibronectin secretion.-Li, L., Kołodziej, T., Jafari, N., Chen, J., Zhu, H., Rajfur, Z., Huang, C. Cdk5-mediated phosphorylation regulates phosphatidylinositol 4-phosphate 5-kinase type I γ 90 activity and cell invasion.
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Affiliation(s)
- Liqing Li
- Markey Cancer Center, University of Kentucky, Lexington, Kentucky, USA
| | - Tomasz Kołodziej
- Markey Cancer Center, University of Kentucky, Lexington, Kentucky, USA.,Faculty of Physics, Astronomy, and Applied Computer Science, Institute of Physics, Jagiellonian University, Krakow, Poland
| | - Naser Jafari
- Markey Cancer Center, University of Kentucky, Lexington, Kentucky, USA
| | - Jing Chen
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, USA; and
| | - Haining Zhu
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky, USA; and
| | - Zenon Rajfur
- Faculty of Physics, Astronomy, and Applied Computer Science, Institute of Physics, Jagiellonian University, Krakow, Poland
| | - Cai Huang
- Markey Cancer Center, University of Kentucky, Lexington, Kentucky, USA.,Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky, USA
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21
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Tran MH, Seo E, Min S, Nguyen QAT, Choi J, Lee UJ, Hong SS, Kang H, Mansukhani A, Jou I, Lee SY. NEDD4-induced degradative ubiquitination of phosphatidylinositol 4-phosphate 5-kinase α and its implication in breast cancer cell proliferation. J Cell Mol Med 2018; 22:4117-4129. [PMID: 29851245 PMCID: PMC6111810 DOI: 10.1111/jcmm.13689] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 04/21/2018] [Indexed: 12/15/2022] Open
Abstract
Phosphatidylinositol 4‐phosphate 5‐kinase (PIP5K) family members generate phosphatidylinositol 4,5‐bisphosphate (PIP2), a critical lipid regulator of diverse physiological processes. The PIP5K‐dependent PIP2 generation can also act upstream of the oncogenic phosphatidylinositol 3‐kinase (PI3K)/Akt pathway. Many studies have demonstrated various mechanisms of spatiotemporal regulation of PIP5K catalytic activity. However, there are few studies on regulation of PIP5K protein stability. Here, we examined potential regulation of PIP5Kα, a PIP5K isoform, via ubiquitin‐proteasome system, and its implication for breast cancer. Our results showed that the ubiquitin ligase NEDD4 (neural precursor cell expressed, developmentally down‐regulated gene 4) mediated ubiquitination and proteasomal degradation of PIP5Kα, consequently reducing plasma membrane PIP2 level. NEDD4 interacted with the C‐terminal region and ubiquitinated the N‐terminal lysine 88 in PIP5Kα. In addition, PIP5Kα gene disruption inhibited epidermal growth factor (EGF)‐induced Akt activation and caused significant proliferation defect in breast cancer cells. Notably, PIP5Kα K88R mutant that was resistant to NEDD4‐mediated ubiquitination and degradation showed more potentiating effects on Akt activation by EGF and cell proliferation than wild‐type PIP5Kα. Collectively, these results suggest that PIP5Kα is a novel degradative substrate of NEDD4 and that the PIP5Kα‐dependent PIP2 pool contributing to breast cancer cell proliferation through PI3K/Akt activation is negatively controlled by NEDD4.
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Affiliation(s)
- Mai Hoang Tran
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Eunjeong Seo
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Soohong Min
- School of Biological Sciences, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, Korea
| | - Quynh-Anh T Nguyen
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Juyong Choi
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Uk-Jin Lee
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Soon-Sun Hong
- Department of Biomedical Sciences, Inha University College of Medicine, Incheon, Korea
| | - Hyuk Kang
- Department of Chemistry, Ajou University, Suwon, Korea
| | - Alka Mansukhani
- Department of Microbiology, New York University School of Medicine, New York, NY, USA
| | - Ilo Jou
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
| | - Sang Yoon Lee
- Department of Biomedical Sciences, Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Korea
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22
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Aleidi SM, Yang A, Sharpe LJ, Rao G, Cochran BJ, Rye KA, Kockx M, Brown AJ, Gelissen IC. The E3 ubiquitin ligase, HECTD1, is involved in ABCA1-mediated cholesterol export from macrophages. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:359-368. [DOI: 10.1016/j.bbalip.2017.12.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 12/19/2017] [Accepted: 12/31/2017] [Indexed: 12/27/2022]
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23
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Fang S, Guo H, Cheng Y, Zhou Z, Zhang W, Han B, Luo W, Wang J, Xie W, Chao J. circHECTD1 promotes the silica-induced pulmonary endothelial-mesenchymal transition via HECTD1. Cell Death Dis 2018; 9:396. [PMID: 29540674 DOI: 10.1038/s41419-018-0432-1] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Excessive proliferation and migration of fibroblasts contribute to pulmonary fibrosis in silicosis, and both epithelial cells and endothelial cells participate in the accumulation of fibroblasts via the epithelial–mesenchymal transition (EMT) and the endothelial–mesenchymal transition (EndMT), respectively. A mouse endothelial cell line (MML1) was exposed to silicon dioxide (SiO2, 50 μg/cm2), and immunofluorescence and western blot analyses were performed to evaluate levels of specific endothelial and mesenchymal markers and to elucidate the mechanisms by which SiO2 induces the EndMT. Functional changes were evaluated by analyzing cell migration and proliferation. The mRNA and circular RNA (circRNA) levels were measured using qPCR and fluorescent in situ hybridization (FISH). Lung tissue samples from both Tie2-GFP mice exposed to SiO2 and silicosis patients were applied to confirm the observations from in vitro experiments. Based on the results from the current study, SiO2 increased the expression of mesenchymal markers (type I collagen (COL1A1), type III collagen (COL3A1) and alpha smooth muscle actin (α-SMA/Acta2)) and decreased the expression of endothelial markers (vascular endothelial cadherin (VE-Cad/Cdh 5) and platelet endothelial cell adhesion molecule-1 (PECAM1)), indicating the occurrence of the EndMT in response to SiO2 exposure both in vivo and in vitro. SiO2 concomitantly increased circHECTD1 expression, which, in turn, inhibited HECTD1 protein expression. SiO2-induced increases in cell proliferation, migration, and changes in marker levels were restored by either a small interfering RNA (siRNA) targeting circHECTD1 or overexpression of HECTD1 via the CRISPR/Cas9 system, confirming the involvement of the circHECTD1/HECTD1 pathway in the EndMT. Moreover, tissue samples from SiO2-exposed mice and silicosis patients confirmed the EndMT and change in HECTD1 expression. Our findings reveal a potentially new function for the circHECTD1/HECTD1 pathway and suggest a possible mechanism of fibrosis in patients with pulmonary silicosis.
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24
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Cheng X, Zheng J, Li G, Göbel V, Zhang H. Degradation for better survival? Role of ubiquitination in epithelial morphogenesis. Biol Rev Camb Philos Soc 2018; 93:1438-1460. [PMID: 29493067 DOI: 10.1111/brv.12404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 01/31/2018] [Accepted: 02/05/2018] [Indexed: 02/06/2023]
Abstract
As a prevalent post-translational modification, ubiquitination is essential for many developmental processes. Once covalently attached to the small and conserved polypeptide ubiquitin (Ub), a substrate protein can be directed to perform specific biological functions via its Ub-modified form. Three sequential catalytic reactions contribute to this process, among which E3 ligases serve to identify target substrates and promote the activated Ub to conjugate to substrate proteins. Ubiquitination has great plasticity, with diverse numbers, topologies and modifications of Ub chains conjugated at different substrate residues adding a layer of complexity that facilitates a huge range of cellular functions. Herein, we highlight key advances in the understanding of ubiquitination in epithelial morphogenesis, with an emphasis on the latest insights into its roles in cellular events involved in polarized epithelial tissue, including cell adhesion, asymmetric localization of polarity determinants and cytoskeletal organization. In addition, the physiological roles of ubiquitination are discussed for typical examples of epithelial morphogenesis, such as lung branching, vascular development and synaptic formation and plasticity. Our increased understanding of ubiquitination in epithelial morphogenesis may provide novel insights into the molecular mechanisms underlying epithelial regeneration and maintenance.
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Affiliation(s)
- Xiaoxiang Cheng
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China
| | - Jun Zheng
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China
| | - Gang Li
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China
| | - Verena Göbel
- Department of Pediatrics, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114,, U.S.A
| | - Hongjie Zhang
- Faculty of Health Sciences, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China
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25
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Duhamel S, Goyette MA, Thibault MP, Filion D, Gaboury L, Côté JF. The E3 Ubiquitin Ligase HectD1 Suppresses EMT and Metastasis by Targeting the +TIP ACF7 for Degradation. Cell Rep 2018; 22:1016-1030. [PMID: 29386124 DOI: 10.1016/j.celrep.2017.12.096] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 10/28/2017] [Accepted: 12/23/2017] [Indexed: 12/20/2022] Open
Abstract
Cancer cells exploit the epithelial-to-mesenchymal transition (EMT) program to become metastatic. Cytoskeletal regulators are required in mesenchymal cells where they promote EMT and EMT-induced migration. In a search for regulators of metastasis, we conducted shRNA screens targeting the microtubule plus-end tracking proteins (+TIPs). We show that the +TIP ACF7 is essential both for the maintenance of the EMT program and to promote migration. We find that the E3 ubiquitin ligase HectD1 promotes ACF7-proteasome-mediated degradation. Depletion of HectD1 stabilized ACF7, and this enhanced EMT and migration. Decreased HectD1 expression increased metastases in mouse models and conferred increased resistance to the cytotoxic drug cisplatin. A retrospective analysis of biopsies from breast cancer patients also reveals a correlation between higher ACF7 or lower HectD1 expression with poor clinical outcomes. Together, these results suggest that the control of ACF7 levels by HectD1 modulates EMT and the efficiency of metastasis.
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Affiliation(s)
- Stéphanie Duhamel
- Montreal Clinical Research Institute (IRCM), Montréal, QC H2W 1R7, Canada
| | - Marie-Anne Goyette
- Montreal Clinical Research Institute (IRCM), Montréal, QC H2W 1R7, Canada; Molecular Biology Programs, Université de Montréal, Montréal, QC H3T 1J4, Canada
| | | | - Dominic Filion
- Montreal Clinical Research Institute (IRCM), Montréal, QC H2W 1R7, Canada
| | - Louis Gaboury
- Institute for Research in Immunology and Cancer (IRIC), Université de Montréal, Montréal, QC H3C 3J7, Canada; Department of Pathology and Cell Biology, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Jean-François Côté
- Montreal Clinical Research Institute (IRCM), Montréal, QC H2W 1R7, Canada; Molecular Biology Programs, Université de Montréal, Montréal, QC H3T 1J4, Canada; Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, QC H3C 3J7, Canada; Department of Anatomy and Cell Biology, McGill University, Montréal, QC H3A 0C7, Canada.
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26
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Bai Y, Zhang Y, Han B, Yang L, Chen X, Huang R, Wu F, Chao J, Liu P, Hu G, Zhang JH, Yao H. Circular RNA DLGAP4 Ameliorates Ischemic Stroke Outcomes by Targeting miR-143 to Regulate Endothelial-Mesenchymal Transition Associated with Blood-Brain Barrier Integrity. J Neurosci 2018; 38:32-50. [PMID: 29114076 PMCID: PMC6705810 DOI: 10.1523/jneurosci.1348-17.2017] [Citation(s) in RCA: 283] [Impact Index Per Article: 47.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 10/24/2017] [Accepted: 10/29/2017] [Indexed: 01/01/2023] Open
Abstract
Circular RNAs (circRNAs) are highly expressed in the CNS and regulate physiological and pathophysiological processes. However, the potential role of circRNAs in stroke remains largely unknown. Here, we show that the circRNA DLGAP4 (circDLGAP4) functions as an endogenous microRNA-143 (miR-143) sponge to inhibit miR-143 activity, resulting in the inhibition of homologous to the E6-AP C-terminal domain E3 ubiquitin protein ligase 1 expression. circDLGAP4 levels were significantly decreased in the plasma of acute ischemic stroke patients (13 females and 13 males) and in a mouse stroke model. Upregulation of circDLGAP4 expression significantly attenuated neurological deficits and decreased infarct areas and blood-brain barrier damage in the transient middle cerebral artery occlusion mouse stroke model. Endothelial-mesenchymal transition contributes to blood-brain barrier disruption and circDLGAP4 overexpression significantly inhibited endothelial-mesenchymal transition by regulating tight junction protein and mesenchymal cell marker expression. Together, the results of our study are illustrative of the involvement of circDLGAP4 and its coupling mechanism in cerebral ischemia, providing translational evidence that circDLGAP4 serves as a novel therapeutic target for acute cerebrovascular protection.SIGNIFICANCE STATEMENT Circular RNAs (circRNAs) are involved in the regulation of physiological and pathophysiological processes. However, whether circRNAs are involved in ischemic injury, particularly cerebrovascular disorders, remains largely unknown. Here, we demonstrate a critical role for circular RNA DLGAP4 (circDLGAP4), a novel circular RNA originally identified as a sponge for microRNA-143 (miR-143), in ischemic stroke outcomes. Overexpression of circDLGAP4 significantly attenuated neurological deficits and decreased infarct areas and blood-brain barrier damage in the transient middle cerebral artery occlusion mouse stroke model. To our knowledge, this is the first report describing the efficacy of circRNA injection in an ischemic stroke model. Our investigation suggests that circDLGAP4 may serve as a novel therapeutic target for acute ischemic injury.
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Affiliation(s)
- Ying Bai
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Yuan Zhang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Bing Han
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Li Yang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Xufeng Chen
- Emergency Department, Jiangsu Province Hospital, Nanjing 210029, China
| | - Rongrong Huang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Fangfang Wu
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Jie Chao
- Department of Physiology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Pei Liu
- Department of Epidemiology and Biostatistics, School of Public Health, Southeast University, Nanjing 210009, China
| | - Gang Hu
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, Nanjing 210029, China
| | - John H Zhang
- Department of Anesthesiology, School of Medicine, Loma Linda University, Loma Linda, California 92354, and
| | - Honghong Yao
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China,
- Institute of Life Sciences, Key Laboratory of Developmental Genes and Human Disease, Southeast University, Nanjing 210096, China
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27
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Zhou Z, Jiang R, Yang X, Guo H, Fang S, Zhang Y, Cheng Y, Wang J, Yao H, Chao J. circRNA Mediates Silica-Induced Macrophage Activation Via HECTD1/ZC3H12A-Dependent Ubiquitination. Am J Cancer Res 2018; 8:575-592. [PMID: 29290828 PMCID: PMC5743568 DOI: 10.7150/thno.21648] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 10/12/2017] [Indexed: 12/16/2022] Open
Abstract
Rationale: Phagocytosis of silicon dioxide (SiO2) into lung cells causes an inflammatory cascade that results in fibroblast proliferation and migration, followed by fibrosis. Circular RNAs (circRNAs) are a subclass of non-coding RNAs detected within mammalian cells; however, researchers have not determined whether circRNAs are involved in the pathophysiological process of silicosis. The upstream molecular mechanisms and functional effects on cell apoptosis, proliferation and migration were investigated to elucidate the role of circRNAs in SiO2-induced inflammation in pulmonary macrophages. Methods: Primary cultures of alveolar macrophages from healthy donors and patients as well as the RAW264.7 macrophage cell line were used to explore the functions of circHECTD1 (HECT domain E3 ubiquitin protein ligase 1) in macrophage activation. Results: The results of the experiments indicated that 1) SiO2 concomitantly decreased circHECTD1 levels and increased HECTD1 protein expression; 2) circHECTD1 and HECTD1 were involved in SiO2-induced macrophage activation via ubiquitination; and 3) SiO2-activated macrophages promoted fibroblast proliferation and migration via the circHECTD1/HECTD1 pathway. Tissue samples from silicosis patients confirmed the upregulation of HECTD1. Conclusions: Our study elucidated a link between SiO2-induced macrophage activation and the circHECTD1/HECTD1 pathway, thereby providing new insight into the potential use of HECTD1 in the development of novel therapeutic strategies for treating silicosis.
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28
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Oikonomaki M, Bady P, Hegi ME. Ubiquitin Specific Peptidase 15 (USP15) suppresses glioblastoma cell growth via stabilization of HECTD1 E3 ligase attenuating WNT pathway activity. Oncotarget 2017; 8:110490-502. [PMID: 29299163 DOI: 10.18632/oncotarget.22798] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/13/2017] [Indexed: 01/12/2023] Open
Abstract
Expression based prediction of new genomic alterations in glioblastoma identified the de-ubiquitinase Ubiquitin Specific Peptidase 15 (USP15) as potential tumor suppressor gene associated with genomic deletions (11%). Ectopic expression of USP15 in glioblastoma cell-lines reduced colony formation and growth in soft agar, while overexpression of its functional mutant had the opposite effect. Evaluation of the protein binding network of USP15 by Mass Spectrometry in glioblastoma cells uncovered eight novel interacting proteins, including HECT Domain Containing E3 Ubiquitin Protein Ligase 1 (HECTD1), whose mouse homologue has been associated with an inhibitory effect on the WNT-pathway. USP15 de-ubiquitinated and thereby stabilized HECTD1 in glioblastoma cells, while depletion of USP15 led to decreased HECTD1 protein levels. Expression of USP15 in glioblastoma cells attenuated WNT-pathway activity, while expression of the functional mutant enhanced the activity. Modulation of HECTD1 expression pheno-copied the effects observed for USP15. In accordance, human glioblastoma display a weak but significant negative correlation between USP15 and AXIN2 expression. Taken together, the data provide evidence that USP15 attenuates the canonical WNT pathway mediated by stabilization of HECTD1, supporting a tumor suppressing role of USP15 in a subset of glioblastoma.
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29
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Li L, Li X, Qi L, Rychahou P, Jafari N, Huang C. The role of talin2 in breast cancer tumorigenesis and metastasis. Oncotarget 2017; 8:106876-106887. [PMID: 29290996 PMCID: PMC5739781 DOI: 10.18632/oncotarget.22449] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Accepted: 10/25/2017] [Indexed: 12/19/2022] Open
Abstract
Recent studies show that talin2 has a higher affinity to β-integrin tails and is indispensable for traction force generation and cell invasion. However, its roles in cell migration, cancer cell metastasis and tumorigenesis remain to be determined. Here, we used MDA-MB-231 human breast cancer cells as a model to define the roles of talin2 in cell migration, invasion, metastasis and tumorigenesis. We show here that talin2 knockdown (KD) inhibited cell migration and focal adhesion dynamics, a key step in cell migration, and that talin2 knockout (KO) inhibited cell invasion and traction force generation, the latter is crucial for cell invasion. Re-expression of talin2WT in talin2-KO cells restored traction force generation and cell invasion, but that of talin2S339C, a β-integrin-binding deficient mutant, did not. Moreover, talin2 KO (or KD) suppressed tumorigenesis and metastasis in mouse xenograft models. However, surprisingly, re-expression of talin2WT in talin2-KO cells did not rescue tumorigenesis. Thus, talin2 is required for breast cancer cell migration, invasion, metastasis and tumorigenesis, although exogenous expression of high levels of talin2 could inhibit tumorigenesis.
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Affiliation(s)
- Liqing Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Xiang Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Lei Qi
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Piotr Rychahou
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Naser Jafari
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Cai Huang
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA.,Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY 40506, USA
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30
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Qi L, Jafari N, Li X, Chen Z, Li L, Hytönen VP, Goult BT, Zhan CG, Huang C. Talin2-mediated traction force drives matrix degradation and cell invasion. J Cell Sci 2017; 129:3661-3674. [PMID: 27694340 DOI: 10.1242/jcs.185959] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 08/18/2016] [Indexed: 12/19/2022] Open
Abstract
Talin binds to β-integrin tails to activate integrins, regulating cell migration, invasion and metastasis. There are two talin genes, TLN1 and TLN2, encoding talin1 and talin2, respectively. Talin1 regulates focal adhesion dynamics, cell migration and invasion, whereas the biological function of talin2 is not clear and, indeed, talin2 has been presumed to function redundantly with talin1. Here, we show that talin2 has a much stronger binding to β-integrin tails than talin1. Replacement of talin2 Ser339 with Cys significantly decreased its binding to β1-integrin tails to a level comparable to that of talin1. Talin2 localizes at invadopodia and is indispensable for the generation of traction force and invadopodium-mediated matrix degradation. Ablation of talin2 suppressed traction force generation and invadopodia formation, which were restored by re-expressing talin2 but not talin1. Furthermore, re-expression of wild-type talin2 (but not talin2S339C) in talin2-depleted cells rescued development of traction force and invadopodia. These results suggest that a strong interaction of talin2 with integrins is required to generate traction, which in turn drives invadopodium-mediated matrix degradation, which is key to cancer cell invasion.
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Affiliation(s)
- Lei Qi
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA Veterans Affairs Medical Center, Lexington, KY 40502, USA
| | - Naser Jafari
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA Veterans Affairs Medical Center, Lexington, KY 40502, USA
| | - Xiang Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Zaozao Chen
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Liqing Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA
| | - Vesa P Hytönen
- BioMediTech, University of Tampere, 33520 Tampere, Finland and Fimlab Laboratories, Tampere 33520, Finland
| | - Benjamin T Goult
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK
| | - Chang-Guo Zhan
- Molecular Modeling and Biopharmaceutical Center, College of Pharmacy, University of Kentucky, Lexington, KY 40506, USA
| | - Cai Huang
- Markey Cancer Center, University of Kentucky, Lexington, KY 40506, USA Veterans Affairs Medical Center, Lexington, KY 40502, USA Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY 40506, USA
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31
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Li H, Xiao N, Wang Y, Wang R, Chen Y, Pan W, Liu D, Li S, Sun J, Zhang K, Sun Y, Ge X. Smurf1 regulates lung cancer cell growth and migration through interaction with and ubiquitination of PIPKIγ. Oncogene 2017; 36:5668-80. [DOI: 10.1038/onc.2017.166] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 03/31/2017] [Accepted: 04/26/2017] [Indexed: 12/12/2022]
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32
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Yuan Y, Li L, Zhu Y, Qi L, Azizi L, Hytönen VP, Zhan CG, Huang C. The molecular basis of talin2's high affinity toward β1-integrin. Sci Rep 2017; 7:41989. [PMID: 28155884 DOI: 10.1038/srep41989] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/04/2017] [Indexed: 01/16/2023] Open
Abstract
Talin interacts with β-integrin tails and actin to control integrin activation, thus regulating focal adhesion dynamics and cell migration. There are two talin genes, Tln1 and Tln2, which encode talin1 and talin2, and it is generally believed that talin2 functions redundantly with talin1. However, we show here that talin2 has a higher affinity to β1-integrin tails than talin1. Mutation of talin2 S339 to leucine, which can cause Fifth Finger Camptodactyly, a human genetic disease, completely disrupted its binding to β–integrin tails. Also, substitution of talin1 C336 with Ser enhanced the affinity of talin1, whereas substitution of talin2 S339 with Cys diminished that of talin2. Further computational modeling analysis shows that talin2 S339 formed a hydrogen bond with E353, which is critical for inducing key hydrogen bonds between talin2 N326 and β1-integrin R760, and between talin2 K327 and β1-integrin D759. Mutation at any of these residues significantly diminished the interaction of talin2 with β1- integrin tails. These hydrogen bonds were not observed in talin1/β1-integrin, but did exist in talin1C336S/β1-integrin complex. These results suggest that talin2 S339 forms a hydrogen bond with E353 to mediate its high affinity to β1-integrin.
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Jafari N, Kim H, Park R, Li L, Jang M, Morris AJ, Park J, Huang C. CRISPR-Cas9 Mediated NOX4 Knockout Inhibits Cell Proliferation and Invasion in HeLa Cells. PLoS One 2017; 12:e0170327. [PMID: 28099519 DOI: 10.1371/journal.pone.0170327] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 01/03/2017] [Indexed: 11/19/2022] Open
Abstract
Increased expression of NOX4 protein is associated with cancer progression and metastasis but the role of NOX4 in cell proliferation and invasion is not fully understood. We generated NOX4 knockout HeLa cell lines using the CRISPR-Cas9 gene editing system to explore the cellular functions of NOX4. After transfection of CRISPR-Cas9 construct, we performed T7 endonuclease 1 assays and DNA sequencing to generate and identify insertion and deletion of the NOX4 locus. We confirmed the knockout of NOX4 by Western blotting. NOX4 knockout cell lines showed reduced cell proliferation with an increase of sub-G1 cell population and the decrease of S/G2/M population. Moreover, NOX4 deficiency resulted in a dramatic decrease in invadopodium formation and the invasive activity. In addition, NOX4 deficiency also caused a decrease in focal adhesions and cell migration in HeLa cells. These results suggest that NOX4 is required for both efficient proliferation and invasion of HeLa cells.
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Thompson PM, Ramachandran S, Case LB, Tolbert CE, Tandon A, Pershad M, Dokholyan NV, Waterman CM, Campbell SL. A Structural Model for Vinculin Insertion into PIP 2-Containing Membranes and the Effect of Insertion on Vinculin Activation and Localization. Structure 2017; 25:264-275. [PMID: 28089450 DOI: 10.1016/j.str.2016.12.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 11/10/2016] [Accepted: 12/12/2016] [Indexed: 12/20/2022]
Abstract
Vinculin, a scaffolding protein that localizes to focal adhesions (FAs) and adherens junctions, links the actin cytoskeleton to the adhesive super-structure. While vinculin binds to a number of cytoskeletal proteins, it can also associate with phosphatidylinositol 4,5-bisphosphate (PIP2) to drive membrane association. To generate a structural model for PIP2-dependent interaction of vinculin with the lipid bilayer, we conducted lipid-association, nuclear magnetic resonance, and computational modeling experiments. We find that two basic patches on the vinculin tail drive membrane association: the basic collar specifically recognizes PIP2, while the basic ladder drives association with the lipid bilayer. Vinculin mutants with defects in PIP2-dependent liposome association were then expressed in vinculin knockout murine embryonic fibroblasts. Results from these analyses indicate that PIP2 binding is not required for localization of vinculin to FAs or FA strengthening, but is required for vinculin activation and turnover at FAs to promote its association with the force transduction FA nanodomain.
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Affiliation(s)
- Peter M Thompson
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Srinivas Ramachandran
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Lindsay B Case
- Cell Biology and Physiology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Caitlin E Tolbert
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Arpit Tandon
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Mihir Pershad
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Nikolay V Dokholyan
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Clare M Waterman
- Cell Biology and Physiology Center, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sharon L Campbell
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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Shen X, Jia Z, D'Alonzo D, Wang X, Bruder E, Emch FH, De Geyter C, Zhang H. HECTD1 controls the protein level of IQGAP1 to regulate the dynamics of adhesive structures. Cell Commun Signal 2017; 15:2. [PMID: 28073378 PMCID: PMC5225595 DOI: 10.1186/s12964-016-0156-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 12/06/2016] [Indexed: 12/21/2022] Open
Abstract
Background Cell migration including collective cell movement and individual cell migration are crucial factors in embryogenesis. During the spreading/migration of cells, several types of adhesive structures physically interacting with the extracellular matrix (ECM) or with another cell have been described and the formation and maturation of adhesion structures are coordinated, however the molecular pathways involved are still not fully understood. Results We generated a mouse embryonic fibroblast line (MEF) from homozygous mutant (Hectd1R/R, Hectd1Gt(RRC200)) mouse of the E3 ubiquitin ligase for inhibin B receptor (Hectd1). Detailed examination of cell motion on MEF cells demonstrated that loss of Hectd1 resulted in accelerated cell spreading and migration but impaired directionality of migration. In Hectd1R/R cells paxillin and zyxin were largely mis-localized, whereas their expression levels were unchanged. In addition the formation of focal adhesions (FAs) was impaired and the focal complexes (FXs) were increased. We further identified HECTD1 as a key regulator of IQGAP1. IQGAP1 co-localized together with HECTD1 in the leading edge of cells. HECTD1 interacted with IQGAP1 and regulated its degradation through ubiquitination. Over-expression of IQGAP1 in control MEF phenocopied the spreading and migration defects of Hectd1R/R cells. In contrast, siRNA-mediated knockdown of IQGAP1 rescued the defects in cellular movement of Hectd1R/R cells. Conclusions The E3 ligase activity of Hectd1 regulates the protein level of IQGAP1 through ubiquitination and therefore mediates the dynamics of FXs including the recruitment of paxillin and actinin. IQGAP1 is one of the effectors of HECTD1. Electronic supplementary material The online version of this article (doi:10.1186/s12964-016-0156-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xiaoli Shen
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland.,Present Address: Chongqing Reproductive and Genetics Institute, 64 Jing Tang ST, Yu Zhong District, Chongqing, 400013, China
| | - Zanhui Jia
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland.,Present Address: 2nd hospital of Jilin University, Changchun, China
| | - Donato D'Alonzo
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland
| | - Xinggang Wang
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland
| | - Elisabeth Bruder
- Pathologie, Universitätsspital Basel, Schönbeinstrasse 40, CH-4031, Basel, Switzerland
| | - Fabienne Hélène Emch
- Clinic of Gynecological Endocrinology and Reproductive Medicine, University Hospital, University of Basel, Basel, Switzerland
| | - Christian De Geyter
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland.,Clinic of Gynecological Endocrinology and Reproductive Medicine, University Hospital, University of Basel, Basel, Switzerland
| | - Hong Zhang
- Department of Biomedicine, University Hospital, University of Basel, Basel, Switzerland. .,Department of Biomedicine, University of Basel, Hebelstra. 20, CH-4031, Basel, Switzerland.
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Jafari N, Zheng Q, Li L, Li W, Qi L, Xiao J, Gao T, Huang C. p70S6K1 (S6K1)-mediated Phosphorylation Regulates Phosphatidylinositol 4-Phosphate 5-Kinase Type I γ Degradation and Cell Invasion. J Biol Chem 2016; 291:25729-25741. [PMID: 27780861 DOI: 10.1074/jbc.m116.742742] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 10/22/2016] [Indexed: 11/06/2022] Open
Abstract
Phosphatidylinositol 4-phosphate 5-kinase type I γ (PIPKIγ90) ubiquitination and subsequent degradation regulate focal adhesion assembly, cell migration, and invasion. However, it is unknown how upstream signals control PIPKIγ90 ubiquitination or degradation. Here we show that p70S6K1 (S6K1), a downstream target of mechanistic target of rapamycin (mTOR), phosphorylates PIPKIγ90 at Thr-553 and Ser-555 and that S6K1-mediated PIPKIγ90 phosphorylation is essential for cell migration and invasion. Moreover, PIPKIγ90 phosphorylation is required for the development of focal adhesions and invadopodia, key machineries for cell migration and invasion. Surprisingly, substitution of Thr-553 and Ser-555 with Ala promoted PIPKIγ90 ubiquitination but enhanced the stability of PIPKIγ90, and depletion of S6K1 also enhanced the stability of PIPKIγ90, indicating that PIPKIγ90 ubiquitination alone is insufficient for its degradation. These data suggest that S6K1-mediated PIPKIγ90 phosphorylation regulates cell migration and invasion by controlling PIPKIγ90 degradation.
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Affiliation(s)
- Naser Jafari
- From the Markey Cancer Center and.,the Veterans Affairs Medical Center, Lexington, Kentucky 40502
| | | | | | - Wei Li
- From the Markey Cancer Center and
| | - Lei Qi
- From the Markey Cancer Center and
| | | | | | - Cai Huang
- From the Markey Cancer Center and .,the Veterans Affairs Medical Center, Lexington, Kentucky 40502.,the Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky 40506 and
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Beard SM, Smit RB, Chan BG, Mains PE. Regulation of the MEI-1/MEI-2 Microtubule-Severing Katanin Complex in Early Caenorhabditis elegans Development. G3 (Bethesda) 2016; 6:3257-68. [PMID: 27527792 DOI: 10.1534/g3.116.031666] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
After fertilization, rapid changes of the Caenorhabditis elegans cytoskeleton occur in the transition from meiosis to mitosis, requiring precise regulation. The MEI-1/MEI-2 katanin microtubule-severing complex is essential for meiotic spindle formation but must be quickly inactivated to allow for proper formation of the mitotic spindle. MEI-1/MEI-2 inactivation is dependent on multiple redundant pathways. The primary pathway employs the MEL-26 substrate adaptor for the CUL-3/cullin-based E3 ubiquitin ligase, which targets MEI-1 for proteosomal degradation. Here, we used quantitative antibody staining to measure MEI-1 levels to determine how other genes implicated in MEI-1 regulation act relative to CUL-3/MEL-26. The anaphase-promoting complex/cyclosome, APC/C, the DYRK (Dual-specificity tyrosine-regulated kinase), MBK-2, and the CUL-2-based E3 ubiquitin ligase act together to degrade MEI-1, in parallel to MEL-26/CUL-3. CUL-2 is known to keep MEL-26 low during meiosis, so CUL-2 apparently changes its target from MEL-26 in meiosis to MEI-1 in mitosis. RFL-1, an activator of cullin E3 ubiquitin ligases, activates CUL-2 but not CUL-3 for MEI-1 elimination. HECD-1 (HECT/Homologous to the E6AP carboxyl terminus domain) E3 ligase acts as a MEI-1 activator in meiosis but functions as an inhibitor during mitosis, without affecting levels of MEI-1 or MEI-2. Our results highlight the multiple layers of MEI-1 regulation that are required during the switch from the meiotic to mitotic modes of cell division.
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Sun M, Cai J, Anderson RA, Sun Y. Type I γ Phosphatidylinositol Phosphate 5-Kinase i5 Controls the Ubiquitination and Degradation of the Tumor Suppressor Mitogen-inducible Gene 6. J Biol Chem 2016; 291:21461-21473. [PMID: 27557663 DOI: 10.1074/jbc.m116.736041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/11/2016] [Indexed: 12/15/2022] Open
Abstract
Mitogen-inducible gene 6 (Mig6) is a tumor suppressor, and the disruption of Mig6 expression is associated with cancer development. Mig6 directly interacts with epidermal growth factor receptor (EGFR) to suppress the activation and downstream signaling of EGFR. Therefore, loss of Mig6 enhances EGFR-mediated signaling and promotes EGFR-dependent carcinogenesis. The molecular mechanism modulating Mig6 expression in cancer remains unclear. Here we demonstrate that type I γ phosphatidylinositol phosphate 5-kinase i5 (PIPKIγi5), an enzyme producing phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2), stabilizes Mig6 expression. Knockdown of PIPKIγi5 leads to the loss of Mig6 expression, which dramatically enhances and prolongs EGFR-mediated cell signaling. Loss of PIPKIγi5 significantly promotes Mig6 protein degradation via proteasomes, but it does not affect the Mig6 mRNA level. PIPKIγi5 directly interacts with the E3 ubiquitin ligase neuronal precursor cell-expressed developmentally down-regulated 4-1 (NEDD4-1). The C-terminal domain of PIPKIγi5 and the WW1 and WW2 domains of NEDD4-1 are required for their interaction. The C2 domain of NEDD4-1 is required for its interaction with PtdIns(4,5)P2 By binding with NEDD4-1 and producing PtdIns(4,5)P2, PIPKIγi5 perturbs NEDD4-1-mediated Mig6 ubiquitination and the subsequent proteasomal degradation. Thus, loss of NEDD4-1 can rescue Mig6 expression in PIPKIγi5 knockdown cells. In this way, PIPKIγi5, NEDD4-1, and Mig6 form a novel molecular nexus that controls EGFR activation and downstream signaling.
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Affiliation(s)
- Ming Sun
- From the Philips Institute for Oral Health Research, School of Dentistry and Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298 and
| | - Jinyang Cai
- From the Philips Institute for Oral Health Research, School of Dentistry and Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298 and
| | - Richard A Anderson
- the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
| | - Yue Sun
- From the Philips Institute for Oral Health Research, School of Dentistry and Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298 and
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Abstract
INTRODUCTION The labyrinthine zone of the placenta is where exchange of nutrients and waste occurs between maternal and fetal circulations. Proper development of the placental labyrinth is essential for successful growth of the developing fetus and abnormalities in placental development are associated with intrauterine growth restriction (IUGR), preeclampsia and fetal demise. Our previous studies demonstrate that Hectd1 is essential for development of the junctional and labyrinthine zones of the placenta. Here we further characterize labyrinthine zone defects in the Hectd1 mutant placenta. METHODS The structure of the mutant placenta was compared to wildtype littermates using histological methods. The expression of cell type specific markers was examined by immunohistochemistry and in situ hybridization. RESULTS Hectd1 is expressed in the labyrinthine zone throughout development and the protein is enriched in syncytiotrophoblast layer type I cells (SynT-I) and Sinusoidal Trophoblast Giant cells (S-TGCs) in the mature placenta. Mutation of Hectd1 results in pale placentas with frequent hemorrhages along with gross abnormalities in the structure of the labyrinthine zone including a smaller overall volume and a poorly elaborated fetal vasculature that contain fewer fetal blood cells. Examination of molecular markers of labyrinthine trophoblast cell types reveals increased Dlx3 positive cells and Syna positive SynT-I cells, along with decreased Hand1 and Ctsq positive sinusoidal trophoblast giant cells (S-TGCs). DISCUSSION Together these defects indicate that Hectd1 is required for development of the labyrinthine zonethe mouse placenta.
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Affiliation(s)
- Anjali A Sarkar
- Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010, USA
| | - Julia A Sabatino
- Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010, USA
| | - Kelsey F Sugrue
- Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010, USA; Institute for Biomedical Sciences, The George Washington University, Washington, DC 20052, USA
| | - Irene E Zohn
- Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010, USA; Institute for Biomedical Sciences, The George Washington University, Washington, DC 20052, USA.
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Li W, Hu Y, Oh S, Ma Q, Merkurjev D, Song X, Zhou X, Liu Z, Tanasa B, He X, Chen AY, Ohgi K, Zhang J, Liu W, Rosenfeld MG. Condensin I and II Complexes License Full Estrogen Receptor α-Dependent Enhancer Activation. Mol Cell 2015; 59:188-202. [PMID: 26166704 DOI: 10.1016/j.molcel.2015.06.002] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/11/2015] [Accepted: 06/02/2015] [Indexed: 11/21/2022]
Abstract
Enhancers instruct spatio-temporally specific gene expression in a manner tightly linked to higher-order chromatin architecture. Critical chromatin architectural regulators condensin I and condensin II play non-redundant roles controlling mitotic chromosomes. But the chromosomal locations of condensins and their functional roles in interphase are poorly understood. Here we report that both condensin complexes exhibit an unexpected, dramatic estrogen-induced recruitment to estrogen receptor α (ER-α)-bound eRNA(+) active enhancers in interphase breast cancer cells, exhibiting non-canonical interaction with ER-α via its DNA-binding domain (DBD). Condensins positively regulate ligand-dependent enhancer activation at least in part by recruiting an E3 ubiquitin ligase, HECTD1, to modulate the binding of enhancer-associated coactivators/corepressors, including p300 and RIP140, permitting full eRNA transcription, formation of enhancer:promoter looping, and the resultant coding gene activation. Collectively, our results reveal an important, unanticipated transcriptional role of interphase condensins in modulating estrogen-regulated enhancer activation and coding gene transcriptional program.
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Le OTT, Cho OY, Tran MH, Kim JA, Chang S, Jou I, Lee SY. Phosphorylation of phosphatidylinositol 4-phosphate 5-kinase γ by Akt regulates its interaction with talin and focal adhesion dynamics. Biochim Biophys Acta 2015; 1853:2432-43. [PMID: 26149501 DOI: 10.1016/j.bbamcr.2015.07.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 06/17/2015] [Accepted: 07/03/2015] [Indexed: 11/16/2022]
Abstract
The type I phosphatidylinositol 4-phosphate 5-kinase (PIP5K) family members and their lipid product, phosphatidylinositol 4,5-bisphosphate (PIP2) are important regulators of actin cytoskeleton. PIP5Kγ 90kDa (PIP5Kγ90), an isoform of PIP5K, localizes to focal adhesions (FAs) and is activated via its interaction with the cytoskeletal protein, talin. Currently, regulatory signaling pathways of talin-PIP5Kγ90 interaction related to FA dynamics and cell motility are not well understood. Considering the presence of Akt consensus motifs in PIP5Kγ90, we examined a potential link of Akt activation to talin-PIP5Kγ90 interaction. We found that Akt phosphorylated PIP5Kγ90 specifically at serine 555 (S555) in vitro and in epidermal growth factor (EGF)-treated cells phosphoinositide 3-kinase-dependently. EGF treatment suppressed talin-PIP5Kγ90 interaction and PIP2 levels. Similarly, a phosphomimetic mutant (S555D), but not non-phosphorylatable mutant (S555A), of PIP5Kγ90 had reduced talin binding affinity, lowered PIP2 levels, and was dislocated from FAs. The S555D mutant also caused decreases in actin stress fibers and vinculin-positive FAs. Moreover, assembly and disassembly of FAs were enhanced by S555D expression and EGF-induced cell migration was relatively low in S555A-expressing cells compared to wild-type-expressing cells. PIP5Kγ87, a PIP5Kγ splice variant lacking the talin binding motif, was phosphorylated by Akt, which, however, hardly affected PIP2 levels. Taken together, our results suggested that Akt-mediated PIP5Kγ90 S555 phosphorylation is a novel regulatory point for talin binding to control PIP2 level at the FAs, thereby modulating FA dynamics and cell motility.
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Affiliation(s)
- Oanh Thi Tu Le
- Department of Biomedical Sciences, Neuroscience Graduate Program, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea.
| | - Oh Yeon Cho
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul 110-799, South Korea
| | - Mai Hoang Tran
- Department of Biomedical Sciences, Neuroscience Graduate Program, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea
| | - Jung Ah Kim
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul 110-799, South Korea
| | - Sunghoe Chang
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul 110-799, South Korea; Biomembrane Plasticity Research Center, Seoul National University College of Medicine, Seoul 110-799, South Korea.
| | - Ilo Jou
- Department of Biomedical Sciences, Neuroscience Graduate Program, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea; Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea; Department of Pharmacology, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea.
| | - Sang Yoon Lee
- Department of Biomedical Sciences, Neuroscience Graduate Program, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea; Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon, Gyeonggi 443-721, South Korea.
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Slater JH, Culver JC, Long BL, Hu CW, Hu J, Birk TF, Qutub AA, Dickinson ME, West JL. Recapitulation and Modulation of the Cellular Architecture of a User-Chosen Cell of Interest Using Cell-Derived, Biomimetic Patterning. ACS Nano 2015; 9:6128-38. [PMID: 25988713 PMCID: PMC5292984 DOI: 10.1021/acsnano.5b01366] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Heterogeneity of cell populations can confound population-averaged measurements and obscure important findings or foster inaccurate conclusions. The ability to generate a homogeneous cell population, at least with respect to a chosen trait, could significantly aid basic biological research and development of high-throughput assays. Accordingly, we developed a high-resolution, image-based patterning strategy to produce arrays of single-cell patterns derived from the morphology or adhesion site arrangement of user-chosen cells of interest (COIs). Cells cultured on both cell-derived patterns displayed a cellular architecture defined by their morphology, adhesive state, cytoskeletal organization, and nuclear properties that quantitatively recapitulated the COIs that defined the patterns. Furthermore, slight modifications to pattern design allowed for suppression of specific actin stress fibers and direct modulation of adhesion site dynamics. This approach to patterning provides a strategy to produce a more homogeneous cell population, decouple the influences of cytoskeletal structure, adhesion dynamics, and intracellular tension on mechanotransduction-mediated processes, and a platform for high-throughput cellular assays.
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Affiliation(s)
- John H. Slater
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, United States
| | - James C. Culver
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States
| | - Byron L. Long
- Department of Bioengineering, Rice University, Houston, Texas, United States
| | - Chenyue W. Hu
- Department of Bioengineering, Rice University, Houston, Texas, United States
| | - Jingzhe Hu
- Department of Bioengineering, Rice University, Houston, Texas, United States
| | - Taylor F. Birk
- Department of Bioengineering, Rice University, Houston, Texas, United States
| | - Amina A. Qutub
- Department of Bioengineering, Rice University, Houston, Texas, United States
| | - Mary E. Dickinson
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, Texas, United States
| | - Jennifer L. West
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, United States
- Address correspondence to:
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Thapa N, Choi S, Tan X, Wise T, Anderson RA. Phosphatidylinositol Phosphate 5-Kinase Iγ and Phosphoinositide 3-Kinase/Akt Signaling Couple to Promote Oncogenic Growth. J Biol Chem 2015; 290:18843-54. [PMID: 26070568 DOI: 10.1074/jbc.m114.596742] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Indexed: 11/06/2022] Open
Abstract
The assembly of signaling complexes at the plasma membrane is required for the initiation and propagation of cellular signaling upon cell activation. The class I PI3K and the serine/threonine-specific protein kinase Akt signaling pathways (PI3K/Akt) are often activated in tumors. These pathways are initiated by the generation of phosphatidylinositol 3,4,5-triphosphate (PIP3) by PI3K-mediated phosphorylation of phosphatidylinositol 4,5-biphosphate (PIP2), synthesized by phosphatidylinositol 4-phosphate 5-kinase (PIPKI) enzymes. The mechanism of how tumor cells recruit and organize the PIP2-synthesizing enzymes with PI3K in the plasma membrane for activation of PI3K/Akt signaling is not defined. Here, we demonstrated a role for the phosphatidylinositol 4-phosphate 5-kinase Iγ (PIPKIγ) in PI3K/Akt signaling. PIPKIγ is overexpressed in triple-negative breast cancers. Loss of PIPKIγ or its focal adhesion-targeting variant, PIPKIγi2, impaired PI3K/Akt activation upon stimulation with growth factors or extracellular matrix proteins in different tumor cells. PIPKIγi2 assembles into a complex containing Src and PI3K; Src was required for the recruitment of PI3K enzyme into the complex. PIPKIγi2 interaction with Src and its lipid kinase activity were required for promoting PI3K/Akt signaling. These results define a mechanism by which PIPKIγi2 and PI3K are integrated into a complex regulated by Src, resulting in the spatial generation of PIP2, which is the substrate PI3K required for PIP3 generation and subsequent Akt activation. This study elucidates the mechanism by which PIP2-generating enzyme controls Akt activation upstream of a PI3K enzyme. This pathway may represent a signaling nexus required for the survival and growth of metastasizing and circulating tumor cells in vivo.
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Affiliation(s)
- Narendra Thapa
- From the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
| | - Suyong Choi
- From the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
| | - Xiaojun Tan
- From the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
| | - Thomas Wise
- From the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
| | - Richard A Anderson
- From the Molecular and Cellular Pharmacology Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin 53706
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45
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Liu X, Liu J, Lester JD, Pijut SS, Graf GA. ABCD2 identifies a subclass of peroxisomes in mouse adipose tissue. Biochem Biophys Res Commun 2014; 456:129-34. [PMID: 25446110 DOI: 10.1016/j.bbrc.2014.11.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 11/13/2014] [Indexed: 10/24/2022]
Abstract
ATP-binding cassette transporter D2 (D2) is an ABC half transporter that is thought to promote the transport of very long-chain fatty acyl-CoAs into peroxisomes. Both D2 and peroxisomes increase during adipogenesis. Although peroxisomes are essential to both catabolic and anabolic lipid metabolism, their function, and that of D2, in adipose tissues remain largely unknown. Here, we investigated the D2 localization and the proteome of D2-containing organelles, in adipose tissue. Centrifugation of mouse adipose homogenates generated a fraction enriched with D2, but deficient in peroxisome markers including catalase, PEX19, and ABCD3 (D3). Electron microscopic imaging of this fraction confirmed the presence of D2 protein on an organelle with a dense matrix and a diameter of ∼ 200 nm, the typical structure and size of a microperoxisome. D2 and PEX19 antibodies recognized distinct structures in mouse adipose. Immunoisolation of the D2-containing compartment confirmed the scarcity of PEX19 and proteomic profiling revealed the presence of proteins associated with peroxisome, endoplasmic reticulum (ER), and mitochondria. D2 is localized to a distinct class of peroxisomes that lack many peroxisome proteins, and may associate physically with mitochondria and the ER.
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Affiliation(s)
- Xiaoxi Liu
- Department of Pharmaceutical Sciences, Saha Cardiovascular Research Center, Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States.
| | - Jingjing Liu
- Department of Pharmaceutical Sciences, Saha Cardiovascular Research Center, Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States.
| | - Joshua D Lester
- Department of Pharmaceutical Sciences, Saha Cardiovascular Research Center, Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States.
| | - Sonja S Pijut
- Department of Pharmaceutical Sciences, Saha Cardiovascular Research Center, Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States.
| | - Gregory A Graf
- Department of Pharmaceutical Sciences, Saha Cardiovascular Research Center, Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States.
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46
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Sarkar AA, Nuwayhid SJ, Maynard T, Ghandchi F, Hill JT, Lamantia AS, Zohn IE. Hectd1 is required for development of the junctional zone of the placenta. Dev Biol 2014; 392:368-80. [PMID: 24855001 DOI: 10.1016/j.ydbio.2014.05.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 05/06/2014] [Accepted: 05/07/2014] [Indexed: 01/17/2023]
Abstract
The placenta plays a critical role in the growth and survival of the fetus. Here we demonstrate that the Homologous to the E6-AP Carboxyl Terminus (HECT) domain E3 ubiquitin ligase, Hectd1, is essential for development of the mouse placenta. Hectd1 is widely expressed during placentation with enrichment in trophoblast giant cells (TGCs) and other trophoblast-derived cell subtypes in the junctional and labyrinth zones of the placenta. Disruption of Hectd1 results in mid-gestation lethality and intrauterine growth restriction (IUGR). Variable defects in the gross structure of the mutant placenta are found including alterations in diameter, thickness and lamination. The number and nuclear size of TGCs is reduced. Examination of subtype specific markers reveals altered TGC development with decreased expression of Placental lactogen-1 and -2 (Pl1 and Pl2) and increased expression of Proliferin (Plf). Reduced numbers of spongiotrophoblasts and glycogen trophoblasts were also found at the junctional zone of the Hectd1 mutant placenta. Finally, there was an increase in immature uterine natural killer (uNK) cells in the maternal decidua of the Hectd1 mutant placenta. Proliferation and apoptosis are differentially altered in the layers of the placenta with an increase in both apoptosis and proliferation in the maternal decidua, a decrease in proliferation and increase in apoptosis in the labyrinth layer and both unchanged in the junctional zone. Together these data demonstrate that Hectd1 is required for development of multiple cell types within the junctional zone of the placenta.
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47
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Shi J, Wang Y, Zeng L, Wu Y, Deng J, Zhang Q, Lin Y, Li J, Kang T, Tao M, Rusinova E, Zhang G, Wang C, Zhu H, Yao J, Zeng YX, Evers BM, Zhou MM, Zhou BP. Disrupting the interaction of BRD4 with diacetylated Twist suppresses tumorigenesis in basal-like breast cancer. Cancer Cell 2014; 25:210-25. [PMID: 24525235 PMCID: PMC4004960 DOI: 10.1016/j.ccr.2014.01.028] [Citation(s) in RCA: 356] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 09/23/2013] [Accepted: 01/24/2014] [Indexed: 12/12/2022]
Abstract
Twist is a key transcription activator of epithelial-mesenchymal transition (EMT). It remains unclear how Twist induces gene expression. Here we report a mechanism by which Twist recruits BRD4 to direct WNT5A expression in basal-like breast cancer (BLBC). Twist contains a "histone H4-mimic" GK-X-GK motif that is diacetylated by Tip60. The diacetylated Twist binds the second bromodomain of BRD4, whose first bromodomain interacts with acetylated H4, thereby constructing an activated Twist/BRD4/P-TEFb/RNA-Pol II complex at the WNT5A promoter and enhancer. Pharmacologic inhibition of the Twist-BRD4 association reduced WNT5A expression and suppressed invasion, cancer stem cell (CSC)-like properties, and tumorigenicity of BLBC cells. Our study indicates that the interaction with BRD4 is critical for the oncogenic function of Twist in BLBC.
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MESH Headings
- Acetylation
- Animals
- Blotting, Western
- Breast Neoplasms/genetics
- Breast Neoplasms/pathology
- Breast Neoplasms/prevention & control
- Carcinoma, Basal Cell/genetics
- Carcinoma, Basal Cell/pathology
- Carcinoma, Basal Cell/prevention & control
- Cell Cycle Proteins
- Cell Transformation, Neoplastic
- Female
- Fluorescent Antibody Technique
- HeLa Cells
- Histone Acetyltransferases/metabolism
- Humans
- Immunoenzyme Techniques
- Lysine Acetyltransferase 5
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Neoplasm Invasiveness
- Neoplastic Stem Cells/pathology
- Nuclear Proteins/antagonists & inhibitors
- Nuclear Proteins/chemistry
- Nuclear Proteins/genetics
- Nuclear Proteins/metabolism
- Positive Transcriptional Elongation Factor B/metabolism
- Promoter Regions, Genetic/genetics
- Proto-Oncogene Proteins/metabolism
- RNA Polymerase II/metabolism
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Transcription Factors/chemistry
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription, Genetic
- Tumor Cells, Cultured
- Twist-Related Protein 1/antagonists & inhibitors
- Twist-Related Protein 1/metabolism
- Wnt Proteins/metabolism
- Wnt-5a Protein
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Affiliation(s)
- Jian Shi
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Yifan Wang
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, and Collaborative Innovation Center of Cancer Medicine, Guangzhou 510060, China
| | - Lei Zeng
- Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Yadi Wu
- Department of Molecular and Biomedical Pharmacology, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Jiong Deng
- Department of Pathophysiology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, and Translation Medicine Center, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Qiang Zhang
- Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Yiwei Lin
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Junlin Li
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Tiebang Kang
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, and Collaborative Innovation Center of Cancer Medicine, Guangzhou 510060, China
| | - Min Tao
- Department of Oncology, the First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Elena Rusinova
- Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Guangtao Zhang
- Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Chi Wang
- Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Haining Zhu
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Jun Yao
- Department of Molecular and Cellular Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
| | - Yi-Xin Zeng
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, and Collaborative Innovation Center of Cancer Medicine, Guangzhou 510060, China
| | - B Mark Evers
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Department of Surgery, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA
| | - Ming-Ming Zhou
- Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Binhua P Zhou
- Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, College of Medicine, University of Kentucky, Lexington, KY 40506, USA; Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, and Collaborative Innovation Center of Cancer Medicine, Guangzhou 510060, China.
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Wu T, Kooi CV, Shah P, Charnigo R, Huang C, Smyth SS, Morris AJ. Integrin-mediated cell surface recruitment of autotaxin promotes persistent directional cell migration. FASEB J 2013; 28:861-70. [PMID: 24277575 DOI: 10.1096/fj.13-232868] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Autotaxin (ATX) is a secreted lysophospholipase D (lysoPLD) that binds to integrin adhesion receptors. We dissected the roles of integrin binding and lysoPLD activity in stimulation of human breast cancer and mouse aortic vascular smooth muscle cell migration by ATX. We compared effects of wild-type human ATX, catalytically inactive ATX, an integrin binding-defective ATX variant with wild-type lysoPLD activity, the isolated ATX integrin binding N-terminal domain, and a potent ATX selective lysoPLD inhibitor on cell migration using transwell and single-cell tracking assays. Stimulation of transwell migration was reduced (18 or 27% of control, respectively) but not ablated by inactivation of integrin binding or inhibition of lysoPLD activity. The N-terminal domain increased transwell migration (30% of control). ATX lysoPLD activity and integrin binding were necessary for a 3.8-fold increase in the fraction of migrating breast cancer cell step velocities >0.7 μm/min. ATX increased the persistent directionality of single-cell migration 2-fold. This effect was lysoPLD activity independent and recapitulated by the integrin binding N-terminal domain. Integrin binding enables uptake and intracellular sequestration of ATX, which redistributes to the front of migrating cells. ATX binding to integrins and lysoPLD activity therefore cooperate to promote rapid persistent directional cell migration.
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Affiliation(s)
- Tao Wu
- 1University of Kentucky, 741 South Limestone St., Lexington KY 40536, USA. A.J.M.,
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Abstract
Integrin receptors provide a dynamic, tightly-regulated link between the extracellular matrix (or cellular counter-receptors) and intracellular cytoskeletal and signalling networks, enabling cells to sense and respond to their chemical and physical environment. Talins and kindlins, two families of FERM-domain proteins, bind the cytoplasmic tail of integrins, recruit cytoskeletal and signalling proteins involved in mechanotransduction and synergize to activate integrin binding to extracellular ligands. New data reveal the domain structure of full-length talin, provide insights into talin-mediated integrin activation and show that RIAM recruits talin to the plasma membrane, whereas vinculin stabilizes talin in cell-matrix junctions. How kindlins act is less well-defined, but disease-causing mutations show that kindlins are also essential for integrin activation, adhesion, cell spreading and signalling.
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Affiliation(s)
- David A Calderwood
- Departments of Pharmacology and of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520, USA. david.calderwood@ yale.edu
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50
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Abstract
Recent discoveries have unveiled the roles of a complicated network of E3 ubiquitin ligases in regulating cell migration machineries. The E3 ubiquitin ligases Smurf1 and Cul/BACURD ubiquitinate RhoA to regulate stress fiber formation and cell polarity, and ASB2α ubiquitinates filamins to modulate cytoskeletal stiffness, thus regulating cell spreading and cell migration. HACE1, XIAP, and Skp1-Cul1-F-box bind to Rac1 and cause its ubiquitination and degradation, thus suppressing lamellipodium protrusions, while PIAS3, a SUMO ligase, activates Rac1 to promote lamellipodium dynamics. Smurf1 also enhances Rac1 activation but it does not ubiquitinate Rac1. Both Smurf1 and HECTD1 regulate focal adhesion (FA) assembly and (or) disassembly through ubiquitinating the talin head domain and phosphatidylinositol 4 phosphate 5-kinase type I γ (PIPKIγ90), respectively. Thus, E3 ubiquitin ligases regulate stress fiber formation, cell polarity, lamellipodium protrusions, and FA dynamics through ubiquitinating the key proteins that control these processes.
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Affiliation(s)
- Shishan Deng
- Markey Cancer Center and Department of Molecular & Biomedical Pharmacology; University of Kentucky; Lexington, KY USA
| | - Cai Huang
- Markey Cancer Center and Department of Molecular & Biomedical Pharmacology; University of Kentucky; Lexington, KY USA
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