1
|
Ng VH, Spencer Z, Neitzel LR, Nayak A, Loberg MA, Shen C, Kassel SN, Kroh HK, An Z, Anthony CC, Bryant JM, Lawson A, Goldsmith L, Benchabane H, Hansen AG, Li J, D'Souza S, Lebensohn AM, Rohatgi R, Weiss WA, Weiss VL, Williams C, Hong CC, Robbins DJ, Ahmed Y, Lee E. The USP46 complex deubiquitylates LRP6 to promote Wnt/β-catenin signaling. Nat Commun 2023; 14:6173. [PMID: 37798301 PMCID: PMC10556042 DOI: 10.1038/s41467-023-41836-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 03/11/2021] [Accepted: 09/20/2023] [Indexed: 10/07/2023] Open
Abstract
The relative abundance of Wnt receptors plays a crucial role in controlling Wnt signaling in tissue homeostasis and human disease. While the ubiquitin ligases that ubiquitylate Wnt receptors are well-characterized, the deubiquitylase that reverses these reactions remains unclear. Herein, we identify USP46, UAF1, and WDR20 (USP46 complex) as positive regulators of Wnt signaling in cultured human cells. We find that the USP46 complex is similarly required for Wnt signaling in Xenopus and zebrafish embryos. We demonstrate that Wnt signaling promotes the association between the USP46 complex and cell surface Wnt coreceptor, LRP6. Knockdown of USP46 decreases steady-state levels of LRP6 and increases the level of ubiquitylated LRP6. In contrast, overexpression of the USP46 complex blocks ubiquitylation of LRP6 by the ubiquitin ligases RNF43 and ZNFR3. Size exclusion chromatography studies suggest that the size of the USP46 cytoplasmic complex increases upon Wnt stimulation. Finally, we show that USP46 is essential for Wnt-dependent intestinal organoid viability, likely via its role in LRP6 receptor homeostasis. We propose a model in which the USP46 complex increases the steady-state level of cell surface LRP6 and facilitates the assembly of LRP6 into signalosomes via a pruning mechanism that removes sterically hindering ubiquitin chains.
Collapse
Affiliation(s)
- Victoria H Ng
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
- Program in Cancer Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Zachary Spencer
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, 03755, USA
| | - Leif R Neitzel
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Anmada Nayak
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, 20057, USA
| | - Matthew A Loberg
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, 37232, USA
| | - Chen Shen
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, 20057, USA
| | - Sara N Kassel
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Heather K Kroh
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, 37232, USA
| | - Zhenyi An
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, 94158, USA
- Department of Pediatrics, University of California San Francisco, San Francisco, CA, 94158, USA
| | - Christin C Anthony
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Jamal M Bryant
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Amanda Lawson
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Lily Goldsmith
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Hassina Benchabane
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, 03755, USA
| | - Amanda G Hansen
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
- STEMCELL Technologies, 1618 Station Street, Vancouver, BC, V6A 1B6, Canada
| | - Jingjing Li
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Starina D'Souza
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Andres M Lebensohn
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Rajat Rohatgi
- Departments of Biochemistry, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - William A Weiss
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, 94158, USA
- Department of Pediatrics, University of California San Francisco, San Francisco, CA, 94158, USA
| | - Vivian L Weiss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, 37232, USA
| | - Charles Williams
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Charles C Hong
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - David J Robbins
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, 20057, USA
| | - Yashi Ahmed
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, 03755, USA.
| | - Ethan Lee
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA.
- Program in Cancer Biology, Vanderbilt University, Nashville, TN, 37232, USA.
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, 37232, USA.
| |
Collapse
|
2
|
Spencer ZT, Ng VH, Benchabane H, Siddiqui GS, Duwadi D, Maines B, Bryant JM, Schwarzkopf A, Yuan K, Kassel SN, Mishra A, Pimentel A, Lebensohn AM, Rohatgi R, Gerber SA, Robbins DJ, Lee E, Ahmed Y. The USP46 deubiquitylase complex increases Wingless/Wnt signaling strength by stabilizing Arrow/LRP6. Nat Commun 2023; 14:6174. [PMID: 37798281 PMCID: PMC10556106 DOI: 10.1038/s41467-023-41843-0] [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: 12/19/2021] [Accepted: 09/20/2023] [Indexed: 10/07/2023] Open
Abstract
The control of Wnt receptor abundance is critical for animal development and to prevent tumorigenesis, but the mechanisms that mediate receptor stabilization remain uncertain. We demonstrate that stabilization of the essential Wingless/Wnt receptor Arrow/LRP6 by the evolutionarily conserved Usp46-Uaf1-Wdr20 deubiquitylase complex controls signaling strength in Drosophila. By reducing Arrow ubiquitylation and turnover, the Usp46 complex increases cell surface levels of Arrow and enhances the sensitivity of target cells to stimulation by the Wingless morphogen, thereby increasing the amplitude and spatial range of signaling responses. Usp46 inactivation in Wingless-responding cells destabilizes Arrow, reduces cytoplasmic accumulation of the transcriptional coactivator Armadillo/β-catenin, and attenuates or abolishes Wingless target gene activation, which prevents the concentration-dependent regulation of signaling strength. Consequently, Wingless-dependent developmental patterning and tissue homeostasis are disrupted. These results reveal an evolutionarily conserved mechanism that mediates Wnt/Wingless receptor stabilization and underlies the precise activation of signaling throughout the spatial range of the morphogen gradient.
Collapse
Affiliation(s)
- Zachary T Spencer
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Victoria H Ng
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Hassina Benchabane
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Ghalia Saad Siddiqui
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Deepesh Duwadi
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Ben Maines
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Jamal M Bryant
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Anna Schwarzkopf
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Kai Yuan
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Sara N Kassel
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA
| | - Anant Mishra
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Ashley Pimentel
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Andres M Lebensohn
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Rajat Rohatgi
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Scott A Gerber
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH, 03766, USA
| | - David J Robbins
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, 20057, USA
| | - Ethan Lee
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, 37232, USA.
| | - Yashi Ahmed
- Department of Molecular and Systems Biology and the Dartmouth Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA.
| |
Collapse
|
3
|
Pilat JM, Brown RE, Chen Z, Berle NJ, Othon AP, Washington MK, Anant SA, Kurokawa S, Ng VH, Thompson JJ, Jacobse J, Goettel JA, Lee E, Choksi YA, Lau KS, Short SP, Williams CS. SELENOP modifies sporadic colorectal carcinogenesis and WNT signaling activity through LRP5/6 interactions. J Clin Invest 2023; 133:e165988. [PMID: 37166989 PMCID: PMC10313376 DOI: 10.1172/jci165988] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 10/06/2022] [Accepted: 05/09/2023] [Indexed: 05/12/2023] Open
Abstract
Although selenium deficiency correlates with colorectal cancer (CRC) risk, the roles of the selenium-rich antioxidant selenoprotein P (SELENOP) in CRC remain unclear. In this study, we defined SELENOP's contributions to sporadic CRC. In human single-cell cRNA-Seq (scRNA-Seq) data sets, we discovered that SELENOP expression rose as normal colon stem cells transformed into adenomas that progressed into carcinomas. We next examined the effects of Selenop KO in a mouse adenoma model that involved conditional, intestinal epithelium-specific deletion of the tumor suppressor adenomatous polyposis coli (Apc) and found that Selenop KO decreased colon tumor incidence and size. We mechanistically interrogated SELENOP-driven phenotypes in tumor organoids as well as in CRC and noncancer cell lines. Selenop-KO tumor organoids demonstrated defects in organoid formation and decreases in WNT target gene expression, which could be reversed by SELENOP restoration. Moreover, SELENOP increased canonical WNT signaling activity in noncancer and CRC cell lines. In defining the mechanism of action of SELENOP, we mapped protein-protein interactions between SELENOP and the WNT coreceptors low-density lipoprotein receptor-related proteins 5 and 6 (LRP5/6). Last, we confirmed that SELENOP-LRP5/6 interactions contributed to the effects of SELENOP on WNT activity. Overall, our results position SELENOP as a modulator of the WNT signaling pathway in sporadic CRC.
Collapse
Affiliation(s)
| | - Rachel E. Brown
- Program in Cancer Biology
- Medical Scientist Training Program, and
| | - Zhengyi Chen
- Program in Chemical and Physical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
- Epithelial Biology Center, VUMC, Nashville, Tennessee, USA
| | - Nathaniel J. Berle
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
| | | | - M. Kay Washington
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | | | - Suguru Kurokawa
- Department of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka, Japan
| | | | | | - Justin Jacobse
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
- Willem Alexander Children’s Hospital, Leiden University Medical Center, Leiden, Netherlands
- Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA
| | - Jeremy A. Goettel
- Program in Cancer Biology
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
- Center for Mucosal Inflammation and Cancer, VUMC, Nashville, Tennessee, USA
| | - Ethan Lee
- Program in Cancer Biology
- Epithelial Biology Center, VUMC, Nashville, Tennessee, USA
- Department of Cell and Developmental Biology and
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Yash A. Choksi
- Program in Cancer Biology
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
- Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA
- Center for Mucosal Inflammation and Cancer, VUMC, Nashville, Tennessee, USA
| | - Ken S. Lau
- Program in Chemical and Physical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
- Epithelial Biology Center, VUMC, Nashville, Tennessee, USA
- Center for Mucosal Inflammation and Cancer, VUMC, Nashville, Tennessee, USA
- Department of Cell and Developmental Biology and
- Department of Surgery, VUMC, Nashville, Tennessee, USA
| | - Sarah P. Short
- Program in Cancer Biology
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
- Center for Mucosal Inflammation and Cancer, VUMC, Nashville, Tennessee, USA
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Christopher S. Williams
- Program in Cancer Biology
- Medical Scientist Training Program, and
- Department of Medicine, Vanderbilt University Medical Center (VUMC), Nashville, Tennessee, USA
- Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA
- Center for Mucosal Inflammation and Cancer, VUMC, Nashville, Tennessee, USA
| |
Collapse
|
4
|
Kassel S, Hanson AJ, Benchabane H, Saito-Diaz K, Cabel CR, Goldsmith L, Taha M, Kanuganti A, Ng VH, Xu G, Ye F, Picker J, Port F, Boutros M, Weiss VL, Robbins DJ, Thorne CA, Ahmed Y, Lee E. USP47 deubiquitylates Groucho/TLE to promote Wnt-β-catenin signaling. Sci Signal 2023; 16:eabn8372. [PMID: 36749823 PMCID: PMC10038201 DOI: 10.1126/scisignal.abn8372] [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] [Indexed: 02/09/2023]
Abstract
The Wnt-β-catenin signal transduction pathway is essential for embryonic development and adult tissue homeostasis. Wnt signaling converts TCF from a transcriptional repressor to an activator in a process facilitated by the E3 ligase XIAP. XIAP-mediated monoubiquitylation of the transcriptional corepressor Groucho (also known as TLE) decreases its affinity for TCF, thereby allowing the transcriptional coactivator β-catenin to displace it on TCF. Through a genome-scale screen in cultured Drosophila melanogaster cells, we identified the deubiquitylase USP47 as a positive regulator of Wnt signaling. We found that USP47 was required for Wnt signaling during Drosophila and Xenopus laevis development, as well as in human cells, indicating evolutionary conservation. In human cells, knockdown of USP47 inhibited Wnt reporter activity, and USP47 acted downstream of the β-catenin destruction complex. USP47 interacted with TLE3 and XIAP but did not alter their amounts; however, knockdown of USP47 enhanced XIAP-mediated ubiquitylation of TLE3. USP47 inhibited ubiquitylation of TLE3 by XIAP in vitro in a dose-dependent manner, suggesting that USP47 is the deubiquitylase that counteracts the E3 ligase activity of XIAP on TLE. Our data suggest a mechanism by which regulated ubiquitylation and deubiquitylation of TLE enhance the ability of β-catenin to cycle on and off TCF, thereby helping to ensure that the expression of Wnt target genes continues only as long as the upstream signal is present.
Collapse
Affiliation(s)
- Sara Kassel
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Alison J. Hanson
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Hassina Benchabane
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH 03755, USA
| | - Kenyi Saito-Diaz
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Carly R. Cabel
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, Tucson, AZ 85724, USA
| | - Lily Goldsmith
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Muhammad Taha
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH 03755, USA
| | - Aksheta Kanuganti
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH 03755, USA
| | - Victoria H. Ng
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - George Xu
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Fei Ye
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Julia Picker
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH 03755, USA
| | - Fillip Port
- German Cancer Research Center (DKFZ), Division Signaling and Functional Genomics and Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Michael Boutros
- German Cancer Research Center (DKFZ), Division Signaling and Functional Genomics and Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Vivian L. Weiss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - David J. Robbins
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA
| | - Curtis A. Thorne
- Department of Cellular and Molecular Medicine, University of Arizona Cancer Center, Tucson, AZ 85724, USA
| | - Yashi Ahmed
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH 03755, USA
- Corresponding authors. (Y.A.), (E.L.)
| | - Ethan Lee
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Corresponding authors. (Y.A.), (E.L.)
| |
Collapse
|
5
|
Shukri WNA, Ng VH, Ismail AK. A case of cough induced rib fracture with subcutaneous emphysema and pneumothorax. Med J Malaysia 2019; 74:551-552. [PMID: 31929488] [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] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Coughing is an important reflex mechanism which enhances the clearance of secretions and particulates from the airways, however repetitive muscle strain due to prolonged coughing may cause the uncommon complication of stress fracture of the ribs. The following is an unusual case of cough induced multiple rib fractures associated with subcutaneous emphysema and pneumothorax which was missed in the emergency setting. Delayed diagnosis and treatment would have been avoided if this uncommon condition was considered as a possibility.
Collapse
Affiliation(s)
- W N A Shukri
- Universiti Kebangsaan Malaysia Medical Centre, Hospital Canselor Tuanku Muhriz, Faculty of Medicine, Department of Emergency Medicine, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur, Malaysia.
| | - V H Ng
- Universiti Kebangsaan Malaysia Medical Centre, Hospital Canselor Tuanku Muhriz, Faculty of Medicine, Department of Emergency Medicine, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur, Malaysia
| | - A K Ismail
- Universiti Kebangsaan Malaysia Medical Centre, Hospital Canselor Tuanku Muhriz, Faculty of Medicine, Department of Emergency Medicine, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur, Malaysia
| |
Collapse
|
6
|
Thompson JJ, Short SP, Parang B, Brown RE, Li C, Ng VH, Saito-Diaz K, Choksi YA, Washington MK, Smith JJ, Fingleton B, Brand T, Lee E, Coffey RJ, Williams CS. Blood vessel epicardial substance reduces LRP6 receptor and cytoplasmic β-catenin levels to modulate Wnt signaling and intestinal homeostasis. Carcinogenesis 2019; 40:1086-1098. [PMID: 30689807 PMCID: PMC8067673 DOI: 10.1093/carcin/bgz007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 12/19/2018] [Accepted: 01/18/2019] [Indexed: 12/16/2022] Open
Abstract
Blood vessel epicardial substance (BVES, otherwise known as POPDC1) is an integral membrane protein known to regulate tight junction formation and epithelial-mesenchymal transition. BVES is underexpressed in a number of malignancies, including colorectal cancer. BVES loss leads to activation of the Wnt pathway, suggesting that decreased BVES expression functionally contributes to tumorigenesis. However, the mechanism by which BVES modulates Wnt signaling is unknown. Here, we confirm that BVES loss increases β-catenin protein levels, leads to Wnt pathway activation in a ligand-independent fashion and coordinates with Wnt ligand to further increase Wnt signaling. We show that BVES loss increases levels and activation of the Wnt co-receptor, LRP6, in cell lines, murine adenoma tumoroids and human-derived colonoids. We also demonstrate that BVES interacts with LRP6. Finally, murine tumor modeling using a Wnt-driven genetic model and a chemically induced model of colorectal carcinogenesis demonstrate that BVES loss increases tumor multiplicity and dysplasia. Together, these results implicate BVES as an inhibitor of Wnt signaling, provide one of the first examples of a tight junction-associated protein regulating Wnt receptor levels, and expand the number of putative molecular targets for therapeutic intervention in colorectal cancer.
Collapse
Affiliation(s)
- Joshua J Thompson
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Sarah P Short
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Bobak Parang
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Rachel E Brown
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Chenxuan Li
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Victoria H Ng
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Kenyi Saito-Diaz
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Yash A Choksi
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Mary K Washington
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Jesse Joshua Smith
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Barbara Fingleton
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Thomas Brand
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Ethan Lee
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Robert J Coffey
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
- Veterans Affairs Tennessee Valley Health Care System, Nashville, TN, USA
| | - Christopher S Williams
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
- Veterans Affairs Tennessee Valley Health Care System, Nashville, TN, USA
| |
Collapse
|
7
|
Ng VH, Hang BI, Sawyer LM, Neitzel LR, Crispi EE, Rose KL, Popay TM, Zhong A, Lee LA, Tansey WP, Huppert S, Lee E. Phosphorylation of XIAP at threonine 180 controls its activity in Wnt signaling. J Cell Sci 2018; 131:jcs.210575. [PMID: 29678905 DOI: 10.1242/jcs.210575] [Citation(s) in RCA: 8] [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: 09/04/2017] [Accepted: 04/16/2018] [Indexed: 11/20/2022] Open
Abstract
X-linked inhibitor of apoptosis (XIAP) plays an important role in preventing apoptotic cell death. XIAP has been shown to participate in signaling pathways, including Wnt signaling. XIAP regulates Wnt signaling by promoting the monoubiquitylation of the co-repressor Groucho/TLE family proteins, decreasing its affinity for the TCF/Lef family of transcription factors and allowing assembly of transcriptionally active β-catenin-TCF/Lef complexes. We now demonstrate that XIAP is phosphorylated by GSK3 at threonine 180, and that an alanine mutant (XIAPT180A) exhibits decreased Wnt activity compared to wild-type XIAP in cultured human cells and in Xenopus embryos. Although XIAPT180A ubiquitylates TLE3 at wild-type levels in vitro, it exhibits a reduced capacity to ubiquitylate and bind TLE3 in human cells. XIAPT180A binds Smac (also known as DIABLO) and inhibits Fas-induced apoptosis to a similar degree to wild-type XIAP. Our studies uncover a new mechanism by which XIAP is specifically directed towards a Wnt signaling function versus its anti-apoptotic function. These findings have implications for development of anti-XIAP therapeutics for human cancers.
Collapse
Affiliation(s)
- Victoria H Ng
- Program in Cancer Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Brian I Hang
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Leah M Sawyer
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Leif R Neitzel
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Emily E Crispi
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Kristie L Rose
- Vanderbilt Mass Spectrometry Research Center Proteomics Core, Nashville, TN 37232, USA
| | - Tessa M Popay
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Alison Zhong
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Laura A Lee
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - William P Tansey
- Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Stacey Huppert
- Division of Gastroenterology, Hepatology, and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Ethan Lee
- Program in Cancer Biology, Vanderbilt University, Nashville, TN 37232, USA .,Department of Cell & Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA.,Vanderbilt Ingram Cancer Center, Vanderbilt Medical Center, Nashville, TN 37232, USA
| |
Collapse
|
8
|
Broadus MR, Chen TW, Neitzel LR, Ng VH, Jodoin JN, Lee LA, Salic A, Robbins DJ, Capobianco AJ, Patton JG, Huppert SS, Lee E. Identification of a Paralog-Specific Notch1 Intracellular Domain Degron. Cell Rep 2016; 15:1920-9. [PMID: 27210761 DOI: 10.1016/j.celrep.2016.04.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 03/14/2016] [Accepted: 04/19/2016] [Indexed: 01/13/2023] Open
Abstract
Upon Notch pathway activation, the receptor is cleaved to release the Notch intracellular domain (NICD), which translocates to the nucleus to activate gene transcription. Using Xenopus egg extracts, we have identified a Notch1-specific destruction signal (N1-Box). We show that mutations in the N1-Box inhibit NICD1 degradation and that the N1-Box is transferable for the promotion of degradation of heterologous proteins in Xenopus egg extracts and in cultured human cells. Mutation of the N1-Box enhances Notch1 activity in cultured human cells and zebrafish embryos. Human cancer mutations within the N1-Box enhance Notch1 signaling in transgenic zebrafish, highlighting the physiological relevance of this destruction signal. We find that binding of the Notch nuclear factor, CSL, to the N1-Box blocks NICD1 turnover. Our studies reveal a mechanism by which degradation of NICD1 is regulated by the N1-Box to minimize stochastic flux and to establish a threshold for Notch1 pathway activation.
Collapse
Affiliation(s)
- Matthew R Broadus
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA; Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Tony W Chen
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Leif R Neitzel
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Victoria H Ng
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Jeanne N Jodoin
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Laura A Lee
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Adrian Salic
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - David J Robbins
- Molecular Oncology Program, Division of Surgical Oncology, Dewitt Daughtry Family Department of Surgery, University of Miami, Miami, FL 33136, USA; Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Anthony J Capobianco
- Molecular Oncology Program, Division of Surgical Oncology, Dewitt Daughtry Family Department of Surgery, University of Miami, Miami, FL 33136, USA; Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - James G Patton
- Department of Biological Sciences, Vanderbilt University, Nashville, TN 37232, USA
| | - Stacey S Huppert
- Division of Gastroenterology, Hepatology, and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
| | - Ethan Lee
- Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA; Vanderbilt Ingram Cancer Center, Vanderbilt Medical Center, Nashville, TN 37232, USA.
| |
Collapse
|