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Mhaidly N, Barake N, Trelcat A, Journe F, Saussez S, Descamps G. Bufalin Suppresses Head and Neck Cancer Development by Modulating Immune Responses and Targeting the β-Catenin Signaling Pathway. Cancers (Basel) 2024; 16:2739. [PMID: 39123466 PMCID: PMC11311268 DOI: 10.3390/cancers16152739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Revised: 07/26/2024] [Accepted: 07/29/2024] [Indexed: 08/12/2024] Open
Abstract
Bufalin, a cardiotonic steroid derived from the Chinese toad (Bufo gargarizans), has demonstrated potent anticancer properties across various cancer types, positioning it as a promising therapeutic candidate. However, comprehensive mechanistic studies specific to head and neck cancers have been lacking. Our study aimed to bridge this gap by investigating bufalin's mechanisms of action in head and neck cancer cells. Using several methods, such as Western blotting, immunofluorescence, and flow cytometry, we observed bufalin's dose-dependent reduction in cell viability, disruption of cell membrane integrity, and inhibition of colony formation in both HPV-positive and HPV-negative cell lines. Bufalin induces apoptosis through the modulation of apoptosis-related proteins, mitochondrial function, and reactive oxygen species production. It also arrests the cell cycle at the G2/M phase and attenuates cell migration while affecting epithelial-mesenchymal transition markers and targeting pivotal signaling pathways, including Wnt/β-catenin, EGFR, and NF-κB. Additionally, bufalin exerted immunomodulatory effects by polarizing macrophages toward the M1 phenotype, bolstering antitumor immune responses. These findings underscore bufalin's potential as a multifaceted therapeutic agent against head and neck cancers, targeting essential pathways involved in proliferation, apoptosis, cell cycle regulation, metastasis, and immune modulation. Further research is warranted to validate these mechanisms and optimize bufalin's clinical application.
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Affiliation(s)
- Nour Mhaidly
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons, Avenue du Champ de Mars, 8, 7000 Mons, Belgium; (N.M.); (N.B.); (A.T.); (S.S.)
| | - Noura Barake
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons, Avenue du Champ de Mars, 8, 7000 Mons, Belgium; (N.M.); (N.B.); (A.T.); (S.S.)
| | - Anne Trelcat
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons, Avenue du Champ de Mars, 8, 7000 Mons, Belgium; (N.M.); (N.B.); (A.T.); (S.S.)
| | - Fabrice Journe
- Laboratory of Clinical and Experimental Oncology (LOCE), Institute Jules Bordet, Université Libre de Bruxelles (ULB), 1000 Brussels, Belgium;
| | - Sven Saussez
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons, Avenue du Champ de Mars, 8, 7000 Mons, Belgium; (N.M.); (N.B.); (A.T.); (S.S.)
| | - Géraldine Descamps
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons, Avenue du Champ de Mars, 8, 7000 Mons, Belgium; (N.M.); (N.B.); (A.T.); (S.S.)
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2
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Zhang C, Ge L, Xie H, Liu X, Xun C, Chen Y, Chen H, Lu M, Chen P. Retinoic acid induced specific changes in the phosphoproteome of C17.2 neural stem cells. J Cell Mol Med 2024; 28:e18205. [PMID: 38506089 PMCID: PMC10951872 DOI: 10.1111/jcmm.18205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 01/16/2024] [Accepted: 02/20/2024] [Indexed: 03/21/2024] Open
Abstract
Retinoic acid (RA), a vitamin A derivative, is an effective cell differentiating factor which plays critical roles in neuronal differentiation induction and the production of neurotransmitters in neurons. However, the specific changes in phosphorylation levels and downstream signalling pathways associated with RA remain unclear. This study employed qualitative and quantitative phosphoproteomics approaches based on mass spectrometry to investigate the phosphorylation changes induced by RA in C17.2 neural stem cells (NSCs). Dimethyl labelling, in conjunction with TiO2 phosphopeptide enrichment, was utilized to profile the phosphoproteome of self-renewing and RA-induced differentiated cells in C17.2 NSCs. The results of our study revealed that, qualitatively, 230 and 14 phosphoproteins were exclusively identified in the self-renewal and RA-induced groups respectively. Quantitatively, we successfully identified and quantified 177 unique phosphoproteins, among which 70 exhibited differential phosphorylation levels. Analysis of conserved phosphorylation motifs demonstrated enrichment of motifs corresponding to cyclin-dependent kinase and MAPK in the RA-induced group. Additionally, through a comprehensive literature and database survey, we found that the differentially expressed proteins were associated with the Wnt/β-catenin and Hippo signalling pathways. This work sheds light on the changes in phosphorylation levels induced by RA in C17.2 NSCs, thereby expanding our understanding of the molecular mechanisms underlying RA-induced neuronal differentiation.
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Affiliation(s)
- Cheng Zhang
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life ScienceSouth China Normal UniversityGuangzhouPR China
| | - Lite Ge
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
- Hunan Provincial Key Laboratory of Neurorestoratology, the Second Affiliated HospitalHunan Normal UniversityChangshaPR China
- Department of Neurology, Second Xiangya HospitalCentral South UniversityChangshaPR China
| | - Huali Xie
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
| | - Xiaoqian Liu
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
| | - Chengfeng Xun
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
| | - Yan Chen
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
| | - Haiyan Chen
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
| | - Ming Lu
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
- Department of Neurology, Second Xiangya HospitalCentral South UniversityChangshaPR China
| | - Ping Chen
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life SciencesHunan Normal UniversityChangshaPR China
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Malyla V, De Rubis G, Paudel KR, Chellappan DK, Hansbro NG, Hansbro PM, Dua K. Berberine nanostructures attenuate ß-catenin, a key component of epithelial mesenchymal transition in lung adenocarcinoma. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2023; 396:3595-3603. [PMID: 37266589 PMCID: PMC10643271 DOI: 10.1007/s00210-023-02553-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 05/23/2023] [Indexed: 06/03/2023]
Abstract
Lung cancer (LC) is the leading cause of cancer-related deaths globally. It accounts for more than 1.9 million cases each year due to its complex and poorly understood molecular mechanisms that result in unregulated cell proliferation and metastasis. β-Catenin is a developmentally active protein that controls cell proliferation, metastasis, polarity and cell fate during homeostasis and aids in cancer progression via epithelial-mesenchymal transition. Therefore, inhibition of the β-catenin pathway could attenuate the progression of LC. Berberine, an isoquinoline alkaloid which is known for its anti-cancer and anti-inflammatory properties, demonstrates poor solubility and bioavailability. In our study, we have encapsulated berberine into liquid crystalline nanoparticles to improve its physiochemical functions and studied if these nanoparticles target the β-catenin pathway to inhibit the human lung adenocarcinoma cell line (A549) at both gene and protein levels. We observed for the first time that berberine liquid crystalline nanoparticles at 5 µM significantly attenuate the expression of the β-catenin gene and protein. The interaction between berberine and β-catenin was further validated by molecular simulation studies. Targeting β-catenin with berberine nanoparticles represents a promising strategy for the management of lung cancer progression.
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Affiliation(s)
- Vamshikrishna Malyla
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Sydney, NSW, 2007, Australia
- Centre for Inflammation, Centenary Institute, Sydney, Sydney, NSW, 2050, Australia
- Australian Research Centre in Complementary and Integrative Medicine, Faculty of Health, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Gabriele De Rubis
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Sydney, NSW, 2007, Australia
- Australian Research Centre in Complementary and Integrative Medicine, Faculty of Health, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Keshav Raj Paudel
- Centre for Inflammation, Centenary Institute, Sydney, Sydney, NSW, 2050, Australia
- Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University, Bukit Jalil 57000, Kuala Lumpur, Malaysia
| | - Nicole G Hansbro
- Centre for Inflammation, Centenary Institute, Sydney, Sydney, NSW, 2050, Australia
- Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Philip M Hansbro
- Centre for Inflammation, Centenary Institute, Sydney, Sydney, NSW, 2050, Australia.
- Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Sydney, NSW, 2007, Australia.
- Centre for Inflammation, Centenary Institute, Sydney, Sydney, NSW, 2050, Australia.
- Australian Research Centre in Complementary and Integrative Medicine, Faculty of Health, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
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4
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Liu L, Yang X, Zhang J, Jiang W, Hou T, Zong Y, Bai H, Yang K, Yang X. Long non-coding RNA SNHG11 regulates the Wnt/β-catenin signaling pathway through rho/ROCK in trabecular meshwork cells. FASEB J 2023; 37:e22873. [PMID: 36929360 DOI: 10.1096/fj.202201733rrr] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 02/16/2023] [Accepted: 03/01/2023] [Indexed: 03/18/2023]
Abstract
Trabecular meshwork (TM) cell dysfunction is the leading cause of elevated intraocular pressure (IOP) and glaucoma. The long non-coding RNA (lncRNA) small nucleolar RNA host gene 11 (SNHG11) is associated with cell proliferation and apoptosis, but its biological functions and role in glaucoma pathogenesis remain unclear. In the present study, we investigated the role of SNHG11 in TM cells using immortalized human TM and glaucomatous human TM (GTM3 ) cells and an acute ocular hypertension mouse model. SNHG11 expression was depleted using siRNA targeting SNHG11. Transwell assays, quantitative real-time PCR analysis (qRT-PCR), western blotting, and CCK-8 assay were used to evaluate cell migration, apoptosis, autophagy, and proliferation. Wnt/β-catenin pathway activity was inferred from qRT-PCR, western blotting, immunofluorescence, and luciferase reporter and TOPFlash reporter assays. The expression of Rho kinases (ROCKs) was detected using qRT-PCR and western blotting. SNHG11 was downregulated in GTM3 cells and mice with acute ocular hypertension. In TM cells, SNHG11 knockdown inhibited cell proliferation and migration, activated autophagy, and apoptosis, repressing the Wnt/β-catenin signaling pathway, and activated Rho/ROCK. Wnt/β-catenin signaling pathway activity increased in TM cells treated with ROCK inhibitor. SNHG11 regulated Wnt/β-catenin signaling through Rho/ROCK by increasing GSK-3β expression and β-catenin phosphorylation at Ser33/37/Thr41 while decreasing β-catenin phosphorylation at Ser675. We demonstrate that the lncRNA SNHG11 regulates Wnt/β-catenin signaling through Rho/ROCK via β-catenin phosphorylation at Ser675 or GSK-3β-mediated phosphorylation at Ser33/37/Thr41, affecting cell proliferation, migration, apoptosis, and autophagy. Through its effects on Wnt/β-catenin signaling, SNHG11 is implicated in glaucoma pathogenesis and is a potential therapeutic target.
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Affiliation(s)
- Lu Liu
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Xuejiao Yang
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Jingjing Zhang
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Wenlan Jiang
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Tianyu Hou
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Yao Zong
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Haiqing Bai
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Kun Yang
- Medical Research Center, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
| | - Xian Yang
- Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao, People's Republic of China
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Kortüm B, Radhakrishnan H, Zincke F, Sachse C, Burock S, Keilholz U, Dahlmann M, Walther W, Dittmar G, Kobelt D, Stein U. Combinatorial treatment with statins and niclosamide prevents CRC dissemination by unhinging the MACC1-β-catenin-S100A4 axis of metastasis. Oncogene 2022; 41:4446-4458. [PMID: 36008464 PMCID: PMC9507965 DOI: 10.1038/s41388-022-02407-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 11/29/2022]
Abstract
Colorectal cancer (CRC) is the second-most common malignant disease worldwide, and metastasis is the main culprit of CRC-related death. Metachronous metastases remain to be an unpredictable, unpreventable, and fatal complication, and tracing the molecular chain of events that lead to metastasis would provide mechanistically linked biomarkers for the maintenance of remission in CRC patients after curative treatment. We hypothesized, that Metastasis-associated in colorectal cancer-1 (MACC1) induces a secretory phenotype to enforce metastasis in a paracrine manner, and found, that the cell-free culture medium of MACC1-expressing CRC cells induces migration. Stable isotope labeling by amino acids in cell culture mass spectrometry (SILAC-MS) of the medium revealed, that S100A4 is significantly enriched in the MACC1-specific secretome. Remarkably, both biomarkers correlate in expression data of independent cohorts as well as within CRC tumor sections. Furthermore, combined elevated transcript levels of the metastasis genes MACC1 and S100A4 in primary tumors and in blood plasma robustly identifies CRC patients at high risk for poor metastasis-free (MFS) and overall survival (OS). Mechanistically, MACC1 strengthens the interaction of β-catenin with TCF4, thus inducing S100A4 synthesis transcriptionally, resulting in elevated secretion to enforce cell motility and metastasis. In cell motility assays, S100A4 was indispensable for MACC1-induced migration, as shown via knock-out and pharmacological inhibition of S100A4. The direct transcriptional and functional relationship of MACC1 and S100A4 was probed by combined targeting with repositioned drugs. In fact, the MACC1-β-catenin-S100A4 axis by statins (MACC1) and niclosamide (S100A4) synergized in inhibiting cancer cell motility in vitro and metastasis in vivo. The MACC1-β-catenin-S100A4 signaling axis is causal for CRC metastasis. Selectively repositioned drugs synergize in restricting MACC1/S100A4-driven metastasis with cross-entity potential.
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Affiliation(s)
- Benedikt Kortüm
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Harikrishnan Radhakrishnan
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Fabian Zincke
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,German Cancer Consortium (DKTK), Heidelberg, Germany
| | | | - Susen Burock
- Charité University Hospital Berlin Centre 10 Charite Comprehensive Cancer Center, Berlin, Germany
| | - Ulrich Keilholz
- Charité University Hospital Berlin Centre 10 Charite Comprehensive Cancer Center, Berlin, Germany
| | - Mathias Dahlmann
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Wolfgang Walther
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Gunnar Dittmar
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Dennis Kobelt
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,German Cancer Consortium (DKTK), Heidelberg, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Ulrike Stein
- Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany. .,German Cancer Consortium (DKTK), Heidelberg, Germany.
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6
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Wang Y, Guo F. Group I PAKs in myelin formation and repair of the central nervous system: what, when, and how. Biol Rev Camb Philos Soc 2021; 97:615-639. [PMID: 34811887 DOI: 10.1111/brv.12815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 10/20/2021] [Accepted: 11/04/2021] [Indexed: 11/30/2022]
Abstract
p21-activated kinases (PAKs) are a family of cell division control protein 42/ras-related C3 botulinum toxin substrate 1 (Cdc42/Rac1)-activated serine/threonine kinases. Group I PAKs (PAK1-3) have distinct activation mechanisms from group II PAKs (PAK4-6) and are the focus of this review. In transformed cancer cells, PAKs regulate a variety of cellular processes and molecular pathways which are also important for myelin formation and repair in the central nervous system (CNS). De novo mutations in group I PAKs are frequently seen in children with neurodevelopmental defects and white matter anomalies. Group I PAKs regulate virtually every aspect of neuronal development and function. Yet their functions in CNS myelination and remyelination remain incompletely defined. Herein, we highlight the current understanding of PAKs in regulating cellular and molecular pathways and discuss the status of PAK-regulated pathways in oligodendrocyte development. We point out outstanding questions and future directions in the research field of group I PAKs and oligodendrocyte development.
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Affiliation(s)
- Yan Wang
- Department of Neurology, Shriners Hospitals for Children/School of Medicine, Institute for Pediatric Regenerative Medicine (IPRM), University of California, Davis, 2425 Stockton Blvd, Sacramento, CA, 95817, U.S.A
| | - Fuzheng Guo
- Department of Neurology, Shriners Hospitals for Children/School of Medicine, Institute for Pediatric Regenerative Medicine (IPRM), University of California, Davis, 2425 Stockton Blvd, Sacramento, CA, 95817, U.S.A
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7
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Knockdown of PAK1 Inhibits the Proliferation and Invasion of Non-Small Cell Lung Cancer Cells Through the ERK Pathway. Appl Immunohistochem Mol Morphol 2021; 28:602-610. [PMID: 31394555 DOI: 10.1097/pai.0000000000000803] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The p21-activated kinase (PAK) family of serine/threonine kinases plays a pivotal role in various human tumors, as supported by our previous report on the overexpressed PAK isoforms in non-small cell lung cancer (NSCLC). To better understand the role of PAKs in tumorigenesis, the authors examined PAK1 expression patterns and its significance in NSCLC. It was demonstrated by immunohistochemical staining that PAK1 was increased and localized in the cytoplasm in 151 of 207 cases. High levels of PAK1 expression correlated with a histologic type of tumor (squamous cell carcinoma), tumor node metastasis stage, and lymph nodal status. We also examined the biological role of PAK1 in lung cancer cell lines transfected with PAK1-small interfering RNA. Decreased expression of PAK1 inhibited lung cancer cell proliferation and invasion, which is the major cause of lung cancer malignancy. Downregulated expression of PAK1 hampered rapidly accelerated fibrosarcoma/mitogen-activated extracellular signal-regulated kinase/extracellular signal-regulated kinase pathway activity but did not affect Wnt/β-catenin signaling. Our findings suggest that PAK1 is an important oncogene in NSCLC, as decreased expression of PAK1 inhibited the proliferation and invasion of NSCLC cells by blocking the ERK pathway. These results provide evidence for using PAK1 inhibition as potential anticancer therapy.
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Frick A, Khare V, Jimenez K, Dammann K, Lang M, Krnjic A, Gmainer C, Baumgartner M, Mesteri I, Gasche C. A Novel PAK1-Notch1 Axis Regulates Crypt Homeostasis in Intestinal Inflammation. Cell Mol Gastroenterol Hepatol 2020; 11:892-907.e1. [PMID: 33189893 PMCID: PMC7900837 DOI: 10.1016/j.jcmgh.2020.11.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS p21-activated kinase-1 (PAK1) belongs to a family of serine-threonine kinases and contributes to cellular pathways such as nuclear factor-κB (NF-κB), mitogen-activated protein kinase (MAPK), phosphatidylinositol 3-kinase/protein kinase B (PI3K/AKT), and Wingless-related integration site(Wnt)/β-catenin, all of which are involved in intestinal homeostasis. Overexpression of PAK1 is linked to inflammatory bowel disease as well as colitis-associated cancer (CAC), and similarly was observed in interleukin (IL)10 knockout (KO) mice, a model of colitis and CAC. Here, we tested the effects of PAK1 deletion on intestinal inflammation and carcinogenesis in IL10 KO mice. METHODS IL10/PAK1 double-knockout (DKO) mice were generated and development of colitis and CAC was analyzed. Large intestines were measured and prepared for histology or RNA isolation. Swiss rolls were stained with H&E and periodic acid-Schiff. Co-immunoprecipitation and immunofluorescence were performed using intestinal organoids, SW480, and normal human colon epithelial cells 1CT. RESULTS When compared with IL10 KO mice, DKOs showed longer colons and prolonged crypts, despite having higher inflammation and numbers of dysplasia. Crypt hyperproliferation was associated with Notch1 activation and diminished crypt differentiation, indicated by a reduction of goblet cells. Gene expression analysis indicated up-regulation of the Notch1 target hairy and enhancer of split-1 and the stem cell receptor leucin-rich repeat-containing G-protein-coupled receptor 5 in DKO mice. Interestingly, the stem cell marker olfactomedin-4 was present in colonic tissue. Increased β-catenin messenger RNA and cytoplasmic accumulation indicated aberrant Wnt signaling. Co-localization and direct interaction of Notch1 and PAK1 was found in colon epithelial cells. Notch1 activation abrogated this effect whereas silencing of PAK1 led to Notch1 activation. CONCLUSIONS PAK1 contributes to the regulation of crypt homeostasis under inflammatory conditions by controlling Notch1. This identifies a novel PAK1-Notch1 axis in intestinal pathophysiology of inflammatory bowel disease and CAC.
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Affiliation(s)
- Adrian Frick
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Vineeta Khare
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Kristine Jimenez
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Kyle Dammann
- Department of Surgery, Saint Luke's University Hospital Bethlehem, Bethlehem, Pennsylvania
| | - Michaela Lang
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Anita Krnjic
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Christina Gmainer
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Maximilian Baumgartner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | | | - Christoph Gasche
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria.
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Coordinated dysregulation of cancer progression by the HER family and p21-activated kinases. Cancer Metastasis Rev 2020; 39:583-601. [PMID: 32820388 DOI: 10.1007/s10555-020-09922-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 07/25/2020] [Indexed: 12/20/2022]
Abstract
Most epithelial cancer types are polygenic in nature and are driven by coordinated dysregulation of multiple regulatory pathways, genes, and protein modifications. The process of coordinated regulation of cancer promoting pathways in response to extrinsic and intrinsic signals facilitates the dysregulation of several pathways with complementary functions, contributing to the hallmarks of cancer. Dysregulation and hyperactivation of cell surface human epidermal growth factor receptors (HERs) and cytoskeleton remodeling by p21-activated kinases (PAKs) are two prominent interconnected aspects of oncogenesis. We briefly discuss the discoveries and significant advances in the area of coordinated regulation of HERs and PAKs in the development and progression of breast and other epithelial cancers. We also discuss how initial studies involving heregulin signaling via HER3-HER2 axis and HER2-overexpressing breast cancer cells not only discovered a mechanistic role of PAK1 in breast cancer pathobiology but also acted as a bridge in generating a broader cancer research interest in other PAK family members and cancer types and catalyzed establishing the role of PAKs in human cancer, at-large. In addition, growth factor stimulation of the PAK pathway also helped to recognize new facets of PAKs, connecting the PAK pathway to oncogenesis, nuclear signaling, gene expression, mitotic progression, DNA damage response, among other phenotypic responses, and shaped the field of PAK cancer research. Finally, we recount some of the current limitations of HER- and PAK-directed therapeutics in counteracting acquired therapeutic resistance and discuss how cancer's as a polygenic disease may be best targeted with a polygenic approach.
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10
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Wang B, Li X, Liu L, Wang M. β-Catenin: oncogenic role and therapeutic target in cervical cancer. Biol Res 2020; 53:33. [PMID: 32758292 PMCID: PMC7405349 DOI: 10.1186/s40659-020-00301-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/28/2020] [Indexed: 12/23/2022] Open
Abstract
Cervical cancer is a common and fatal malignancy of the female reproductive system. Human papillomavirus (HPV) is the primary causal agent for cervical cancer, but HPV infection alone is insufficient to cause the disease. Actually, most HPV infections are sub-clinical and cleared spontaneously by the host immune system; very few persist and eventually develop into cervical cancer. Therefore, other host or environmental alterations could also contribute to the malignant phenotype. One of the candidate co-factors is the β-catenin protein, a pivotal component of the Wnt/β-catenin signaling pathway. β-Catenin mainly implicates two major cellular activities: cell–cell adhesion and signal transduction. Recent studies have indicated that an imbalance in the structural and signaling properties of β-catenin leads to various cancers, such as cervical cancer. In this review, we will systematically summarize the role of β-catenin in cervical cancer and provide new insights into therapeutic strategies.
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Affiliation(s)
- Bingqi Wang
- Department of Laboratory Medicine, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
| | - Xianping Li
- Department of Laboratory Medicine, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
| | - Lei Liu
- Department of Laboratory Medicine, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China
| | - Min Wang
- Department of Laboratory Medicine, The Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, China.
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Dammann K, Khare V, Coleman C, Berdel H, Gasche C. p-21 Activated Kinase as a Molecular Target for Chemoprevention in Diabetes. Geriatrics (Basel) 2018; 3:geriatrics3040073. [PMID: 31011108 PMCID: PMC6371191 DOI: 10.3390/geriatrics3040073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/12/2018] [Accepted: 10/16/2018] [Indexed: 12/26/2022] Open
Abstract
Hypothesis: Anti-diabetic drugs modulate p-21 activated kinase (PAK) signaling. Introduction: Type 2 diabetes mellitus (T2DM) is a chronic inflammatory disease associated with increased cancer risk. PAK signaling is implicated in cellular homeostasis when regulated, and cancer when unrestrained. Recent reports provided a role for PAK signaling in glucose homeostasis, but the role of PAKs in the pathogenesis of T2DM is unknown. Here, we performed a mini-meta-analysis to explore if anti-diabetic drugs modify PAK signaling pathways, and provide insight regarding modulation of these pathways, to potentially reduce diabetes-associated cancer risk. Methods: PAK interacting partners in T2DM were identified using the online STRING database. Correlation studies were performed via systematic literature review to understand the effect of anti-diabetic drugs on PAK signaling. A mini-meta-analysis correlated multiple clinical studies and revealed the overall clinical response rate and percentage of adverse events in piogliazone (n = 53) and metformin (n = 91) treated patients with PAK-associated diseases. Results: A total of 30 PAK interacting partners were identified (10: reduced beta-cell mass; 10: beta-cell dysfunction; 10: obesity-insulin resistance), which were highly associated with Wnt, and G-protein signaling. The anti-diabetic drug metformin activated signaling pathways upstream; whereas pioglitazone inhibited pathways downstream of PAK. Overall, clinical response upon pioglitazone treatment was 53%. Seventy-nine percent of pioglitazone and 75% of metformin treated patients had adverse events. Pioglitazone reduced molecular-PAK biomarkers of proliferation (Ki67 and CyclinD1), and metformin had the opposite effect. Conclusions: PAK signaling in T2DM likely involves Wnt and G-protein signaling, which may be altered by the anti-diabetic drugs metformin and pioglitazone. Apart from the therapeutic limitations of adverse events, pioglitazone may be promising in chemoprevention. However long-term multi-centered studies, which initiate pioglitazone treatment early will be required to fully assess the full potential of these drugs.
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Affiliation(s)
- Kyle Dammann
- Department of Clinical Medicine, Medical University of the Americas, Devens, MA 01434, USA.
| | - Vineeta Khare
- Department of Internal Medicine III, Medical University of Vienna, Vienna 1090, Austria.
| | - Clyde Coleman
- Department of Surgery, University of Kentucky HealthCare, Lexington, KY 40536, USA.
| | - Henrik Berdel
- Department of Acute Care and Trauma Surgery, University of Kentucky HealthCare, Lexington, KY 40536, USA.
| | - Christoph Gasche
- Department of Internal Medicine III, Medical University of Vienna, Vienna 1090, Austria.
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12
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Chow HY, Dong B, Valencia CA, Zeng CT, Koch JN, Prudnikova TY, Chernoff J. Group I Paks are essential for epithelial- mesenchymal transition in an Apc-driven model of colorectal cancer. Nat Commun 2018; 9:3473. [PMID: 30150766 PMCID: PMC6110733 DOI: 10.1038/s41467-018-05935-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 08/02/2018] [Indexed: 02/05/2023] Open
Abstract
p21-activated kinases (Paks) play an important role in oncogenic signaling pathways and have been considered as potential therapeutic targets in various cancers. Most studies of Pak function employ gene knock-out or knock-down methods, but these approaches result in loss of both enzymatic and scaffolding properties of these proteins, and thus may not reflect the effects of small molecule inhibitors. Here we use a transgenic mouse model in which a specific peptide inhibitor of Group I Paks is conditionally expressed in response to Cre recombinase. Using this model, we show that inhibition of endogenous Paks impedes the transition of adenoma to carcinoma in an Apc-driven mouse model of colorectal cancer. These effects are mediated by inhibition of Wnt signaling through reduced β-catenin activity as well as suppression of an epithelial-mesenchymal transition program mediated by miR-200 and Snai1. These results highlight the potential therapeutic role of Pak1 inhibitors in colorectal cancer.
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Affiliation(s)
- H Y Chow
- Cancer Center, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, 610041, Chengdu, Sichuan, China
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - B Dong
- Cancer Center, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, 610041, Chengdu, Sichuan, China
| | - C A Valencia
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - C T Zeng
- Cancer Center, National Clinical Research Center for Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, 610041, Chengdu, Sichuan, China
| | - J N Koch
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - T Y Prudnikova
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - J Chernoff
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA.
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13
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Shukla V, Popli P, Kaushal JB, Gupta K, Dwivedi A. Uterine TPPP3 plays important role in embryo implantation via modulation of β-catenin†. Biol Reprod 2018; 99:982-999. [DOI: 10.1093/biolre/ioy136] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 06/11/2018] [Indexed: 12/22/2022] Open
Affiliation(s)
- Vinay Shukla
- Division of Endocrinology, CSIR- Central Drug Research Institute, Lucknow-226031, UP, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CDRI Campus, Lucknow, India
| | - Pooja Popli
- Division of Endocrinology, CSIR- Central Drug Research Institute, Lucknow-226031, UP, India
| | - Jyoti Bala Kaushal
- Division of Endocrinology, CSIR- Central Drug Research Institute, Lucknow-226031, UP, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CDRI Campus, Lucknow, India
| | - Kanchan Gupta
- Division of Endocrinology, CSIR- Central Drug Research Institute, Lucknow-226031, UP, India
| | - Anila Dwivedi
- Division of Endocrinology, CSIR- Central Drug Research Institute, Lucknow-226031, UP, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CDRI Campus, Lucknow, India
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14
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Impaired Wnt Signaling in the Prefrontal Cortex of Alzheimer's Disease. Mol Neurobiol 2018; 56:873-891. [PMID: 29804228 DOI: 10.1007/s12035-018-1103-z] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 05/01/2018] [Indexed: 12/25/2022]
Abstract
Wnt pathway is involved in synaptic plasticity and neuronal survival, and alterations in Wnt signaling have previously been reported both in aging and neurodegenerative diseases, including Alzheimer's disease (AD). This study sought to evaluate Wnt signaling pathway interplay integrity across prefrontal lobe structures in AD patients compared to normal aging. Using the open-access BrainCloud™ database, 84 gene expression profiles and clustering effect were analyzed in the dorsomedial prefrontal cortex (PFC) across a time span of 21-78 years of age. Next, expression levels of the selected genes were investigated in post-mortem brain tissue from 30 AD patients and 30 age-matched controls in three interdependent brain areas of the PFC. Results were assessed in relation to Braak stage and cognitive impairment of the patients. We found a general age-related factor in Wnt pathway genes with a group of genes being closely interrelated in their expression across the time span investigated in healthy individuals. This interrelation was altered in the AD brains studied, as several genes presented aberrant transcription, even though not always being altered at protein levels. Noteworthy, beta(β)-catenin and glycogen synthase kinase 3-beta (GSK3β) showed a dynamic switch in protein levels and activity, especially in the orbitofrontal cortex and the medial frontal gyrus. A significant decrease in β-catenin protein levels were inversely associated with increased GSK3β tyrosine activating phosphorylation, in addition to downstream effects associated with disease progression and cognitive decline. This study is the first that comprehensively evaluates Wnt signaling pathway in the prefrontal cortical lobe structures of AD brains, in relation to age-related coordinated Wnt signaling changes. Our findings further support that increased kinase activity of GSK3β is associated with AD pathology in the PFC.
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15
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Chen Y, Peng Y, Yu J, Chen T, Wu Y, Shi L, Li Q, Wu J, Fu X. Invasive Fusobacterium nucleatum activates beta-catenin signaling in colorectal cancer via a TLR4/P-PAK1 cascade. Oncotarget 2018; 8:31802-31814. [PMID: 28423670 PMCID: PMC5458249 DOI: 10.18632/oncotarget.15992] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/20/2017] [Indexed: 12/15/2022] Open
Abstract
The underlying mechanism of Fusobacterium nucleatum (Fn) in the carcinogenesis of colorectal cancer (CRC) is poorly understood. Here, we examined Fn abundance in CRC tissues, as well as β-catenin, TLR4 and PAK1 protein abundance in Fn positive and Fn negative CRCs. Furthermore, we isolated a strain of Fn (F01) from a CRC tissue and examined whether Fn (F01) infection of colon cancer cells activated β-catenin signaling via the TLR4/P-PAK1/P-β-catenin S675 cascade. Invasive Fn was abundant in 62.2% of CRC tissues. TLR4, PAK1 and nuclear β-catenin proteins were more abundant within Fn-positive over Fn-negative CRCs (P < 0.05). Fn and its lipopolysaccharide induced a significant increase in TLR4/P-PAK1/P-β-catenin S675/C-myc/CyclinD1 protein abundance, as well as in the nuclear translocation of β-catenin. Furthermore, inhibition of TLR4 or PAK1 prior to challenge with Fn significantly decreased protein abundance of P-β-catenin S675, C-myc and Cyclin D1, as well as nuclear β-catenin accumulation. Inhibition of TLR4 significantly decreased P-PAK1 protein abundance, and for the first time, we observed an interaction between TLR4 and P-PAK1 using immunoprecipitation. Our data suggest that invasive Fn activates β-catenin signaling via a TLR4/P-PAK1/P-β-catenin S675 cascade in CRC. Furthermore, TLR4 and PAK1 could be potential pharmaceutical targets for the treatment of Fn-related CRCs.
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Affiliation(s)
- Yongyu Chen
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Yan Peng
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Jiahui Yu
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Ting Chen
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Yaxin Wu
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Lei Shi
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Qing Li
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Jiao Wu
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
| | - Xiangsheng Fu
- Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Sichuan, 646000, China
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16
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Kovacs D, Migliano E, Muscardin L, Silipo V, Catricalà C, Picardo M, Bellei B. The role of Wnt/β-catenin signaling pathway in melanoma epithelial-to-mesenchymal-like switching: evidences from patients-derived cell lines. Oncotarget 2017; 7:43295-43314. [PMID: 27175588 PMCID: PMC5190024 DOI: 10.18632/oncotarget.9232] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 04/10/2016] [Indexed: 12/13/2022] Open
Abstract
Deregulations or mutations of WNT/β-catenin signaling have been associated to both tumour formation and progression. However, contradictory results concerning the role of β-catenin in human melanoma address an open question on its oncogenic nature and prognostic value in this tumour. Changes in WNT signaling pathways have been linked to phenotype switching of melanoma cells between a highly proliferative/non-invasive and a slow proliferative/metastatic condition. We used a novel panel of cell lines isolated from melanoma specimens, at initial passages, to investigate phenotype differences related to the levels and activity of WNT/β-catenin signaling pathway. This in vitro cell system revealed a marked heterogeneity that comprises, in some cases, two distinct tumour-derived subpopulations of cells presenting a different activation level and cellular distribution of β-catenin. In cells derived from the same tumor, we demonstrated that the prevalence of LEF1 (high β-catenin expressing cells) or TCF4 (low β-catenin expressing cells) as β-catenin partner for DNA binding, is associated to the expression of two distinct profiles of WNT-responsive genes. Interestingly, melanoma cells expressing relative low level of β-catenin and an invasive markers signature were associated to the TNF-α-induced pro-inflammatory pathway and to the chemotherapy resistance, suggesting that the co-existence of melanoma subpopulations with distinct biological properties could influence the impact of chemo- and immunotherapy.
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Affiliation(s)
- Daniela Kovacs
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Emilia Migliano
- Department of Plastic and Reconstructive Surgery, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Luca Muscardin
- Dermatopathological Laboratory, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Vitaliano Silipo
- Department of Oncologic Dermatology, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Caterina Catricalà
- Department of Oncologic Dermatology, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Mauro Picardo
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Barbara Bellei
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
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17
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Kumar R, Sanawar R, Li X, Li F. Structure, biochemistry, and biology of PAK kinases. Gene 2016; 605:20-31. [PMID: 28007610 DOI: 10.1016/j.gene.2016.12.014] [Citation(s) in RCA: 151] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 11/24/2016] [Accepted: 12/14/2016] [Indexed: 02/07/2023]
Abstract
PAKs, p21-activated kinases, play central roles and act as converging junctions for discrete signals elicited on the cell surface and for a number of intracellular signaling cascades. PAKs phosphorylate a vast number of substrates and act by remodeling cytoskeleton, employing scaffolding, and relocating to distinct subcellular compartments. PAKs affect wide range of processes that are crucial to the cell from regulation of cell motility, survival, redox, metabolism, cell cycle, proliferation, transformation, stress, inflammation, to gene expression. Understandably, their dysregulation disrupts cellular homeostasis and severely impacts key cell functions, and many of those are implicated in a number of human diseases including cancers, neurological disorders, and cardiac disorders. Here we provide an overview of the members of the PAK family and their current status. We give special emphasis to PAK1 and PAK4, the prototypes of groups I and II, for their profound roles in cancer, the nervous system, and the heart. We also highlight other family members. We provide our perspective on the current advancements, their growing importance as strategic therapeutic targets, and our vision on the future of PAKs.
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Affiliation(s)
- Rakesh Kumar
- Department of Biochemistry and Molecular Medicine, School of Medicine and Health Sciences, George Washington University, Washington, DC 20037, USA; Cancer Biology Program, Rajiv Gandhi Center of Biotechnology, Thiruvananthapuram 695014, India.
| | - Rahul Sanawar
- Cancer Biology Program, Rajiv Gandhi Center of Biotechnology, Thiruvananthapuram 695014, India
| | - Xiaodong Li
- Department of Cell Biology, Key Laboratory of Medical Cell Biology, Chinese Ministry of Education, China Medical University, Shenyang 110122, China
| | - Feng Li
- Department of Cell Biology, Key Laboratory of Medical Cell Biology, Chinese Ministry of Education, China Medical University, Shenyang 110122, China.
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18
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The guanine nucleotide exchange factor Net1 facilitates the specification of dorsal cell fates in zebrafish embryos by promoting maternal β-catenin activation. Cell Res 2016; 27:202-225. [PMID: 27910850 DOI: 10.1038/cr.2016.141] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Revised: 09/18/2016] [Accepted: 09/27/2016] [Indexed: 12/14/2022] Open
Abstract
Wnt/β-catenin signaling is essential for the initiation of dorsal-ventral patterning during vertebrate embryogenesis. Maternal β-catenin accumulates in dorsal marginal nuclei during cleavage stages, but its critical target genes essential for dorsalization are silent until mid-blastula transition (MBT). Here, we find that zebrafish net1, a guanine nucleotide exchange factor, is specifically expressed in dorsal marginal blastomeres after MBT, and acts as a zygotic factor to promote the specification of dorsal cell fates. Loss- and gain-of-function experiments show that the GEF activity of Net1 is required for the activation of Wnt/β-catenin signaling in zebrafish embryos and mammalian cells. Net1 dissociates and activates PAK1 dimers, and PAK1 kinase activation causes phosphorylation of S675 of β-catenin after MBT, which ultimately leads to the transcription of downstream target genes. In summary, our results reveal that Net1-regulated β-catenin activation plays a crucial role in the dorsal axis formation during zebrafish development.
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19
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Kumar R, Li DQ. PAKs in Human Cancer Progression: From Inception to Cancer Therapeutic to Future Oncobiology. Adv Cancer Res 2016; 130:137-209. [PMID: 27037753 DOI: 10.1016/bs.acr.2016.01.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Since the initial recognition of a mechanistic role of p21-activated kinase 1 (PAK1) in breast cancer invasion, PAK1 has emerged as one of the widely overexpressed or hyperactivated kinases in human cancer at-large, allowing the PAK family to make in-roads in cancer biology, tumorigenesis, and cancer therapeutics. Much of our current understanding of the PAK family in cancer progression relates to a central role of the PAK family in the integration of cancer-promoting signals from cell membrane receptors as well as function as a key nexus-modifier of complex, cytoplasmic signaling network. Another core aspect of PAK signaling that highlights its importance in cancer progression is through PAK's central role in the cross talk with signaling and interacting proteins, as well as PAK's position as a key player in the phosphorylation of effector substrates to engage downstream components that ultimately leads to the development cancerous phenotypes. Here we provide a comprehensive review of the recent advances in PAK cancer research and its downstream substrates in the context of invasion, nuclear signaling and localization, gene expression, and DNA damage response. We discuss how a deeper understanding of PAK1's pathobiology over the years has widened research interest to the PAK family and human cancer, and positioning the PAK family as a promising cancer therapeutic target either alone or in combination with other therapies. With many landmark findings and leaps in the progress of PAK cancer research since the infancy of this field nearly 20 years ago, we also discuss postulated advances in the coming decade as the PAK family continues to shape the future of oncobiology.
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Affiliation(s)
- R Kumar
- School of Medicine and Health Sciences, George Washington University, Washington, DC, United States; Rajiv Gandhi Center of Biotechnology, Thiruvananthapuram, India.
| | - D-Q Li
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai, China; Key Laboratory of Breast Cancer in Shanghai, Shanghai Medical College, Fudan University, Shanghai, China; Key Laboratory of Epigenetics in Shanghai, Shanghai Medical College, Fudan University, Shanghai, China.
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20
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Dammann K, Khare V, Lang M, Claudel T, Harpain F, Granofszky N, Evstatiev R, Williams JM, Pritchard DM, Watson A, Gasche C. PAK1 modulates a PPARγ/NF-κB cascade in intestinal inflammation. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1853:2349-60. [PMID: 26036343 PMCID: PMC4576212 DOI: 10.1016/j.bbamcr.2015.05.031] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/13/2015] [Accepted: 05/28/2015] [Indexed: 02/07/2023]
Abstract
P21-activated kinases (PAKs) are multifunctional effectors of Rho GTPases with both kinase and scaffolding activity. Here, we investigated the effects of inflammation on PAK1 signaling and its role in colitis-driven carcinogenesis. PAK1 and p-PAK1 (Thr423) were assessed by immunohistochemistry, immunofluorescence, and Western blot. C57BL6/J wildtype mice were treated with a single intraperitoneal TNFα injection. Small intestinal organoids from these mice and from PAK1-KO mice were cultured with TNFα. NF-κB and PPARγ were analyzed upon PAK1 overexpression and silencing for transcriptional/translational regulation. PAK1 expression and activation was increased on the luminal intestinal epithelial surface in inflammatory bowel disease and colitis-associated cancer. PAK1 was phosphorylated upon treatment with IFNγ, IL-1β, and TNFα. In vivo, mice administered with TNFα showed increased p-PAK1 in intestinal villi, which was associated with nuclear p65 and NF-κB activation. p65 nuclear translocation downstream of TNFα was strongly inhibited in PAK1-KO small intestinal organoids. PAK1 overexpression induced a PAK1-p65 interaction as visualized by co-immunoprecipitation, nuclear translocation, and increased NF-κB transactivation, all of which were impeded by kinase-dead PAK1. Moreover, PAK1 overexpression downregulated PPARγ and mesalamine recovered PPARγ through PAK1 inhibition. On the other hand PAK1 silencing inhibited NF-κB, which was recovered using BADGE, a PPARγ antagonist. Altogether these data demonstrate that PAK1 overexpression and activation in inflammation and colitis-associated cancer promote NF-κB activity via suppression of PPARγ in intestinal epithelial cells.
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Affiliation(s)
- Kyle Dammann
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Vineeta Khare
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Michaela Lang
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Thierry Claudel
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Hans Popper Laboratory for Molecular Hepatology, Vienna, Austria
| | - Felix Harpain
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Nicolas Granofszky
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Rayko Evstatiev
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria
| | - Jonathan M Williams
- Department of Gastroenterology, University of Liverpool, Liverpool, United Kingdom
| | - D Mark Pritchard
- Department of Gastroenterology, University of Liverpool, Liverpool, United Kingdom
| | - Alastair Watson
- Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - Christoph Gasche
- Medical University of Vienna, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Vienna, Austria.
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21
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Dammann K, Khare V, Harpain F, Lang M, Kurtovic A, Mesteri I, Evstatiev R, Gasche C. PAK1 promotes intestinal tumor initiation. Cancer Prev Res (Phila) 2015; 8:1093-101. [PMID: 26304465 DOI: 10.1158/1940-6207.capr-15-0205-t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 08/04/2015] [Indexed: 11/16/2022]
Abstract
p21-activated kinase 1 (PAK1) is a serine/threonine kinase that is overexpressed in colorectal cancer. PAK1 is a target of mesalamine [5-aminosylicylic acid (5-ASA)], a common drug for the treatment of ulcerative colitis with prospective chemopreventive properties. Here, we investigated whether PAK1 deletion impedes tumorigenesis in murine intestinal cancer models. Ten-week-old APC(min) or APC(min)/PAK1(-/-) mice were monitored for 8 weeks, euthanized, and assessed for tumor number and size. Six- to 8-week-old PAK1(-/-) and wild-type (WT) mice received one 10 mg/kg intraperitoneal injection of azoxymethane (AOM) and four cycles of 1.7% dextran sodium sulfate (DSS) for 4 days followed by 14 days of regular water. Mice also received 5-ASA via diet. Tumor incidence and size was assessed via colonoscopy and pathology. Molecular targets of PAK1 and 5-ASA were evaluated via immunohistochemistry (IHC) in both models. PAK1 deletion reduced tumor multiplicity and tumor burden but did not alter average tumor size in APC(min) mice. IHC revealed that PAK1 deletion reduced p-AKT, β-catenin, and c-Myc expression in APC(min) adenomas. Colonoscopy and pathologic analysis revealed that PAK1 deletion reduced tumor multiplicity without affecting tumor size in AOM/DSS-treated mice. 5-ASA treatment and PAK1 deletion impeded tumor multiplicity and dysplastic lesions in AOM/DSS mice. IHC further revealed that 5-ASA blocked β-catenin signaling via inhibition of PAK1/p-AKT. These data indicate that PAK1 contributes to initiation of intestinal carcinogenesis.
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Affiliation(s)
- Kyle Dammann
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Vineeta Khare
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Felix Harpain
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Michaela Lang
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Azra Kurtovic
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Ildiko Mesteri
- Clinical Institute of Pathology, Medical University of Vienna, Vienna, Austria
| | - Rayko Evstatiev
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Christoph Gasche
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria.
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22
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Khare V, Dammann K, Asboth M, Krnjic A, Jambrich M, Gasche C. Overexpression of PAK1 promotes cell survival in inflammatory bowel diseases and colitis-associated cancer. Inflamm Bowel Dis 2015; 21:287-96. [PMID: 25569743 PMCID: PMC4345971 DOI: 10.1097/mib.0000000000000281] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 10/09/2014] [Indexed: 12/16/2022]
Abstract
BACKGROUND Chronic gut inflammation predisposes to the development of colorectal cancer and increased mortality. Use of mesalamine (5-ASA) in the treatment of ulcerative colitis modulates the risk of neoplastic progression. p21 activated kinase 1 (PAK1) mediates 5-ASA activity by orchestrating MAPK signaling, Wnt-β catenin pathway, and cell adhesion; all implicated in the colon carcinogenesis. We evaluated the role of PAK1 in IBD and in colitis-associated cancer (CAC). METHODS AND RESULTS PAK1 expression was scored by immunohistochemistry in human samples from IBD, CAC, and in normal mucosa. Compared with controls, a higher PAK1 expression was detected in IBD which further increased in CAC. The consequence of PAK1 overexpression was investigated using normal diploid colon epithelial cells (HCEC-1CT), which showed higher proliferation and decreased apoptosis on overexpression of PAK1. Analysis of IBD and CAC samples showed activation of AKT (p-AKT). However, mTOR pathway was activated in IBD but not in CAC. Treatment of cells with specific inhibitors (PD98059/LY294002/rapamycin) of growth signaling pathways (MEK/PI3K/mTOR) demonstrated that in HCEC-1CT, PAK1 expression is regulated by MEK, PI3K, and mTOR. In colorectal cancer cell lines, PAK1, and beta-catenin expression correlated and inhibition of PAK1 and addition of 5-ASA elicited similar molecular affects by reducing ERK and AKT activation. Moreover, 5-ASA disrupted PAK1 interaction and colocalization with β-catenin. CONCLUSIONS Our data indicate that (1) PAK1 is upregulated in IBD and CAC (2) PAK1 overexpression is associated with activation of PI3K-AKT/mTOR prosurvival pathways in IBD.
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Affiliation(s)
- Vineeta Khare
- Christian Doppler Laboratory for Molecular Cancer Chemoprevention Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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Cuello-Carrión FD, Shortrede JE, Alvarez-Olmedo D, Cayado-Gutiérrez N, Castro GN, Zoppino FCM, Guerrero M, Martinis E, Wuilloud R, Gómez NN, Biaggio V, Orozco J, Gago FE, Ciocca LA, Fanelli MA, Ciocca DR. HER2 and β-catenin protein location: importance in the prognosis of breast cancer patients and their correlation when breast cancer cells suffer stressful situations. Clin Exp Metastasis 2015; 32:151-68. [DOI: 10.1007/s10585-015-9694-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 01/06/2015] [Indexed: 12/11/2022]
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Yin J, Zeng F, Wu N, Kang K, Yang Z, Yang H. Interleukin-8 promotes human ovarian cancer cell migration by epithelial-mesenchymal transition induction in vitro. Clin Transl Oncol 2014; 17:365-70. [PMID: 25373532 DOI: 10.1007/s12094-014-1240-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 10/01/2014] [Indexed: 12/14/2022]
Abstract
PURPOSE It has been well established that high serum levels of interleukin-8 (IL-8) in ovarian cancer result in a poor clinical outcome. Thus, the aim of this study was investigating the role of IL-8 in ovarian cancer development. METHODS Two human ovarian cancer cell lines (SKOV3 and OVCAR3) were cocultured with IL-8 (100 ng/L) for 24 h, then cell migration was determined by transwell assay. Epithelial-mesenchymal transition (EMT)-associated proteins including E-cadherin and β-catenin, and phosphorylation status of β-catenin were investigated by Western blot analysis. RESULTS After treatment with IL-8 (100 ng/L) for 24 h, transwell assay result showed that the number of migrated ovarian cells increased significantly. Western blot analysis revealed that protein levels of E-cadherin were decreased, while that of β-catenin were elevated both in IL-8 pretreated SKOV3 and OVCAR3 cells. We further found that phosphorylation status of β-catenin were elevated either in cytoplasm or in nucleus of these two ovarian cancer cell lines after treatment with IL-8 for 24 h. CONCLUSIONS Our data suggest that IL-8 induces EMT in ovarian cancer cells and implicates its potential role in enhancing ovarian cancer cell metastasis.
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Affiliation(s)
- J Yin
- Department of Gynecology, The Ninth People's Hospital of Chongqing, 69 JiaLing Road, Chongqing, 400700, People's Republic of China
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Dammann K, Khare V, Gasche C. Republished: tracing PAKs from GI inflammation to cancer. Postgrad Med J 2014; 90:657-68. [PMID: 25335797 PMCID: PMC4222351 DOI: 10.1136/postgradmedj-2014-306768rep] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/07/2014] [Accepted: 04/10/2014] [Indexed: 12/20/2022]
Abstract
P-21 activated kinases (PAKs) are effectors of Rac1/Cdc42 which coordinate signals from the cell membrane to the nucleus. Activation of PAKs drive important signalling pathways including mitogen activated protein kinase, phospoinositide 3-kinase (PI3K/AKT), NF-κB and Wnt/β-catenin. Intestinal PAK1 expression increases with inflammation and malignant transformation, although the biological relevance of PAKs in the development and progression of GI disease is only incompletely understood. This review highlights the importance of altered PAK activation within GI inflammation, emphasises its effect on oncogenic signalling and discusses PAKs as therapeutic targets of chemoprevention.
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Affiliation(s)
- Kyle Dammann
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Vineeta Khare
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Christoph Gasche
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
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26
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Abstract
P-21 activated kinases (PAKs) are effectors of Rac1/Cdc42 which coordinate signals from the cell membrane to the nucleus. Activation of PAKs drive important signalling pathways including mitogen activated protein kinase, phospoinositide 3-kinase (PI3K/AKT), NF-κB and Wnt/β-catenin. Intestinal PAK1 expression increases with inflammation and malignant transformation, although the biological relevance of PAKs in the development and progression of GI disease is only incompletely understood. This review highlights the importance of altered PAK activation within GI inflammation, emphasises its effect on oncogenic signalling and discusses PAKs as therapeutic targets of chemoprevention.
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Affiliation(s)
- Kyle Dammann
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Vineeta Khare
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
| | - Christoph Gasche
- Department of Medicine III, Division of Gastroenterology and Hepatology and Christian Doppler Laboratory for Molecular Cancer Chemoprevention, Medical University of Vienna, Vienna, Austria
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27
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Abstract
p21-Activated protein kinases (PAKs) are centrally involved in a plethora of cellular processes and functions. Their function as effectors of small GTPases Rac1 and Cdc42 has been extensively studied during the past two decades, particularly in the realms of cell proliferation, apoptosis, and hence tumorigenesis, as well as cytoskeletal remodeling and related cellular events in health and disease. In recent years, a large number of studies have shed light onto the fundamental role of group I PAKs, most notably PAK1, in metabolic homeostasis. In skeletal muscle, PAK1 was shown to mediate the function of insulin on stimulating GLUT4 translocation and glucose uptake, while in pancreatic β-cells, PAK1 participates in insulin granule localization and vesicle release. Furthermore, we demonstrated that PAK1 mediates the cross talk between insulin and Wnt/β-catenin signaling pathways and hence regulates gut proglucagon gene expression and the production of the incretin hormone glucagon-like peptide-1 (GLP-1). The utilization of chemical inhibitors of PAK and the characterization of Pak1(-/-) mice enabled us to gain mechanistic insights as well as to assess the overall contribution of PAKs in metabolic homeostasis. This review summarizes our current understanding of PAKs, with an emphasis on the emerging roles of PAK1 in glucose homeostasis.
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28
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Lien WH, Polak L, Lin M, Lay K, Zheng D, Fuchs E. In vivo transcriptional governance of hair follicle stem cells by canonical Wnt regulators. Nat Cell Biol 2014; 16:179-90. [PMID: 24463605 PMCID: PMC3984009 DOI: 10.1038/ncb2903] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 11/29/2013] [Indexed: 02/07/2023]
Abstract
Hair follicle stem cells (HFSCs) regenerate hair in response to Wnt signalling. Here, we unfold genome-wide transcriptional and chromatin landscapes of β-catenin-TCF3/4-TLE circuitry, and genetically dissect their biological roles within the native HFSC niche. We show that during HFSC quiescence, TCF3, TCF4 and TLE (Groucho) bind coordinately and transcriptionally repress Wnt target genes. We also show that β-catenin is dispensable for HFSC viability, and if TCF3/4 levels are sufficiently reduced, it is dispensable for proliferation. However, β-catenin is essential to activate genes that launch hair follicle fate and suppress sebocyte fate determination. TCF3/4 deficiency mimics Wnt-β-catenin-dependent activation of these hair follicle fate targets; TCF3 overexpression parallels their TLE4-dependent suppression. Our studies unveil TCF3/4-TLE histone deacetylases as a repressive rheostat, whose action can be relieved by Wnt-β-catenin signalling. When TCF3/4 and TLE levels are high, HFSCs can maintain stemness, but remain quiescent. When these levels drop or when Wnt-β-catenin levels rise, this balance is shifted and hair regeneration initiates.
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Affiliation(s)
- Wen-Hui Lien
- Howard Hughes Medical Institute, Laboratory of Mammalian Cell Biology and Development, The Rockefeller University, New York, New York 10065, USA
| | - Lisa Polak
- Howard Hughes Medical Institute, Laboratory of Mammalian Cell Biology and Development, The Rockefeller University, New York, New York 10065, USA
| | - Mingyan Lin
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Kenneth Lay
- Howard Hughes Medical Institute, Laboratory of Mammalian Cell Biology and Development, The Rockefeller University, New York, New York 10065, USA
| | - Deyou Zheng
- Department of Genetics, Albert Einstein College of Medicine, Bronx, New York 10461, USA
- Department of Neurology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Elaine Fuchs
- Howard Hughes Medical Institute, Laboratory of Mammalian Cell Biology and Development, The Rockefeller University, New York, New York 10065, USA
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Arias-Romero LE, Villamar-Cruz O, Huang M, Hoeflich KP, Chernoff J. Pak1 kinase links ErbB2 to β-catenin in transformation of breast epithelial cells. Cancer Res 2013; 73:3671-82. [PMID: 23576562 DOI: 10.1158/0008-5472.can-12-4453] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
p21-Activated kinase-1 (Pak1) is frequently upregulated in human breast cancer and is required for transformation of mammary epithelial cells by ErbB2. Here, we show that loss of Pak1, but not the closely related Pak2, leads to diminished expression of β-catenin and its target genes. In MMTV-ErbB2 transgenic mice, loss of Pak1 prolonged survival, and mammary tissues of such mice showed loss of β-catenin. Expression of a β-catenin mutant bearing a phospho-mimetic mutation at Ser 675, a specific Pak1 phosphorylation site, restored transformation to ErbB2-positive, Pak1-deficient mammary epithelial cells. Mice bearing xenografts of ErbB2-positive breast cancer cells showed tumor regression when treated with small-molecule inhibitors of Pak or β-catenin, and combined inhibition by both agents was synergistic. These data delineate a signaling pathway from ErbB2 to Pak to β-catenin that is required for efficient transformation of mammary epithelial cells, and suggest new therapeutic strategies in ErbB2-positive breast cancer.
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MESH Headings
- Animals
- Apoptosis/drug effects
- Apoptosis/genetics
- Blotting, Western
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/prevention & control
- Cell Line
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Cell Survival/drug effects
- Cell Survival/genetics
- Cell Transformation, Neoplastic/drug effects
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Dose-Response Relationship, Drug
- Epithelial Cells/drug effects
- Epithelial Cells/metabolism
- Humans
- Mice
- Mice, Inbred ICR
- Mice, Knockout
- Mice, SCID
- Mice, Transgenic
- Pyrazoles/pharmacology
- Pyrroles/pharmacology
- RNA Interference
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/metabolism
- Xenograft Model Antitumor Assays
- beta Catenin/genetics
- beta Catenin/metabolism
- p21-Activated Kinases/genetics
- p21-Activated Kinases/metabolism
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Affiliation(s)
- Luis E Arias-Romero
- Cancer Biology Program and Department of Pathology, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
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Regulation of adherens junction dynamics by phosphorylation switches. JOURNAL OF SIGNAL TRANSDUCTION 2012; 2012:125295. [PMID: 22848810 PMCID: PMC3403498 DOI: 10.1155/2012/125295] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/21/2012] [Accepted: 05/22/2012] [Indexed: 12/15/2022]
Abstract
Adherens junctions connect the actin cytoskeleton of neighboring cells through transmembrane cadherin receptors and a network of adaptor proteins. The interactions between these adaptors and cadherin as well as the activity of actin regulators localized to adherens junctions are tightly controlled to facilitate cell junction assembly or disassembly in response to changes in external or internal forces and/or signaling. Phosphorylation of tyrosine, serine, or threonine residues acts as a switch on the majority of adherens junction proteins, turning "on" or "off" their interactions with other proteins and/or their enzymatic activity. Here, we provide an overview of the kinases and phosphatases regulating phosphorylation of adherens junction proteins and bring examples of phosphorylation events leading to the assembly or disassembly of adherens junctions, highlighting the important role of phosphorylation switches in regulating their dynamics.
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