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Sun L, Amraei R, Rahimi N. NEDD4 regulates ubiquitination and stability of the cell adhesion molecule IGPR-1 via lysosomal pathway. J Biomed Sci 2021; 28:35. [PMID: 33962630 PMCID: PMC8103646 DOI: 10.1186/s12929-021-00731-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 04/28/2021] [Indexed: 11/10/2022] Open
Abstract
Background The cell adhesion molecule IGPR-1 regulates various critical cellular processes including, cell–cell adhesion, mechanosensing and autophagy and plays important roles in angiogenesis and tumor growth; however, the molecular mechanism governing the cell surface levels of IGPR-1 remains unknown. Results In the present study, we used an in vitro ubiquitination assay and identified ubiquitin E3 ligase NEDD4 and the ubiquitin conjugating enzyme UbcH6 involved in the ubiquitination of IGPR-1. In vitro GST-pulldown and in vivo co-immunoprecipitation assays demonstrated that NEDD4 binds to IGPR-1. Over-expression of wild-type NEDD4 downregulated IGPR-1 and deletion of WW domains (1–4) of NEDD4 revoked its effects on IGPR-1. Knockdown of NEDD4 increased IGPR-1 levels in A375 melanoma cells. Deletion of 57 amino acids encompassing the polyproline rich (PPR) motifs on the C-terminus of IGPR-1 nullified its binding with NEDD4. Furthermore, we demonstrate that NEDD4 promotes K48- and K63-dependent polyubiquitination of IGPR-1. The NEDD4-mediated polyubiquitination of IGPR-1 stimulates lysosomal-dependent degradation of IGPR-1 as the treatment of cells with the lysosomal inhibitors, bafilomycine or ammonium chloride increased IGPR-1 levels ectopically expressed in HEK-293 cells and in multiple endogenously IGPR-1 expressing human skin melanoma cell lines. Conclusions NEDD4 ubiquitin E3 ligase binds to and mediates polyubiquitination of IGPR-1 leading to its lysosomal-dependent degradation. NEDD4 is a key regulator of IGPR-1 expression with implication in the therapeutic targeting of IGPR-1 in human cancers. Supplementary Information The online version contains supplementary material available at 10.1186/s12929-021-00731-9.
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Affiliation(s)
- Linzi Sun
- Department of Pathology, School of Medicine, Boston University Medical Campus, 670 Albany Street, Boston, MA, 02118, USA
| | - Razie Amraei
- Department of Pathology, School of Medicine, Boston University Medical Campus, 670 Albany Street, Boston, MA, 02118, USA
| | - Nader Rahimi
- Department of Pathology, School of Medicine, Boston University Medical Campus, 670 Albany Street, Boston, MA, 02118, USA.
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Amraei R, Alwani T, Ho RXY, Aryan Z, Wang S, Rahimi N. Cell adhesion molecule IGPR-1 activates AMPK connecting cell adhesion to autophagy. J Biol Chem 2020; 295:16691-16699. [PMID: 32978258 PMCID: PMC7864065 DOI: 10.1074/jbc.ra120.014790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/22/2020] [Indexed: 01/17/2023] Open
Abstract
Autophagy plays critical roles in the maintenance of endothelial cells in response to cellular stress caused by blood flow. There is growing evidence that both cell adhesion and cell detachment can modulate autophagy, but the mechanisms responsible for this regulation remain unclear. Immunoglobulin and proline-rich receptor-1 (IGPR-1) is a cell adhesion molecule that regulates angiogenesis and endothelial barrier function. In this study, using various biochemical and cellular assays, we demonstrate that IGPR-1 is activated by autophagy-inducing stimuli, such as amino acid starvation, nutrient deprivation, rapamycin, and lipopolysaccharide. Manipulating the IκB kinase β activity coupled with in vivo and in vitro kinase assays demonstrated that IκB kinase β is a key serine/threonine kinase activated by autophagy stimuli and that it catalyzes phosphorylation of IGPR-1 at Ser220 The subsequent activation of IGPR-1, in turn, stimulates phosphorylation of AMP-activated protein kinase, which leads to phosphorylation of the major pro-autophagy proteins ULK1 and Beclin-1 (BECN1), increased LC3-II levels, and accumulation of LC3 punctum. Thus, our data demonstrate that IGPR-1 is activated by autophagy-inducing stimuli and in response regulates autophagy, connecting cell adhesion to autophagy. These findings may have important significance for autophagy-driven pathologies such cardiovascular diseases and cancer and suggest that IGPR-1 may serve as a promising therapeutic target.
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Affiliation(s)
- Razie Amraei
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA
| | - Tooba Alwani
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA
| | - Rachel Xi-Yeen Ho
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA
| | - Zahra Aryan
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA
| | - Shawn Wang
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA
| | - Nader Rahimi
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts, USA.
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Ho RXY, Tahboub R, Amraei R, Meyer RD, Varongchayakul N, Grinstaff M, Rahimi N. The cell adhesion molecule IGPR-1 is activated by and regulates responses of endothelial cells to shear stress. J Biol Chem 2019; 294:13671-13680. [PMID: 31341021 DOI: 10.1074/jbc.ra119.008548] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 07/19/2019] [Indexed: 12/17/2022] Open
Abstract
Vascular endothelial cells respond to blood flow-induced shear stress. However, the mechanisms through which endothelial cells transduce mechanical signals to cellular responses remain poorly understood. In this report, using tensile-force assays, immunofluorescence and atomic force microscopy, we demonstrate that immunoglobulin and proline-rich receptor-1 (IGPR-1) responds to mechanical stimulation and increases the stiffness of endothelial cells. We observed that IGPR-1 is activated by shear stress and tensile force and that flow shear stress-mediated IGPR-1 activation modulates remodeling of endothelial cells. We found that under static conditions, IGPR-1 is present at the cell-cell contacts; however, under shear stress, it redistributes along the cell borders into the flow direction. IGPR-1 activation stimulated actin stress fiber assembly and cross-linking with vinculin. Moreover, we noted that IGPR-1 stabilizes cell-cell junctions of endothelial cells as determined by staining of cells with ZO1. Mechanistically, shear stress stimulated activation of AKT Ser/Thr kinase 1 (AKT1), leading to phosphorylation of IGPR-1 at Ser-220. Inhibition of this phosphorylation prevented shear stress-induced actin fiber assembly and endothelial cell remodeling. Our findings indicate that IGPR-1 is an important player in endothelial cell mechanosensing, insights that have important implications for the pathogenesis of common maladies, including ischemic heart diseases and inflammation.
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Affiliation(s)
- Rachel Xi-Yeen Ho
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts 02118
| | - Rawan Tahboub
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts 02118
| | - Razie Amraei
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts 02118
| | - Rosana D Meyer
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts 02118
| | - Nitinun Varongchayakul
- Departments of Biomedical Engineering, Chemistry, and Medicine, Boston University, Boston, Massachusetts 02215
| | - Mark Grinstaff
- Departments of Biomedical Engineering, Chemistry, and Medicine, Boston University, Boston, Massachusetts 02215
| | - Nader Rahimi
- Department of Pathology, School of Medicine, Boston University Medical Campus, Boston, Massachusetts 02118
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Wang YHW, Meyer RD, Bondzie PA, Jiang Y, Rahimi I, Rezazadeh K, Mehta M, Laver NMV, Costello CE, Rahimi N. IGPR-1 Is Required for Endothelial Cell-Cell Adhesion and Barrier Function. J Mol Biol 2016; 428:5019-5033. [PMID: 27838321 DOI: 10.1016/j.jmb.2016.11.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 11/02/2016] [Accepted: 11/03/2016] [Indexed: 12/22/2022]
Abstract
Endothelial cell (EC) barrier function plays a prevalent regulatory mechanism for the integrity and homeostasis of blood vessels and modulates angiogenesis and immune responses. Cell adhesion molecules (CAMs) play a central role in the barrier function of ECs. Although Ig-containing and proline-rich receptor-1(IGPR-1) was recently identified as a novel CAM expressed in ECs, the molecular mechanisms underlying the function of IGPR-1 in ECs remain uncharacterized. In this report, we investigated the role of IGPR-1 in EC barrier function and the molecular mechanism of its activation in ECs. We demonstrate that IGPR-1 is localized to endothelial adherens junctions and, through trans-homophilic dimerization, regulates endothelial cell-cell adhesion and barrier function. Trans-homophilic dimerization of IGPR-1 stimulates the phosphorylation of serine 220 (Ser220), which is required for IGPR-1 to regulate endothelial barrier function and angiogenesis. Moreover, IGPR-1 chimera, which mimics the trans-homophilic dimerization of IGPR-1, induced a sustained phosphorylation of Ser220 upon stimulation with a ligand. Coordinated dimerization of IGPR-1 and its homophilic interaction modulates its adhesive function and Ser220 phosphorylation. This adhesive function of IGPR-1 contributes to the barrier function of ECs.
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Affiliation(s)
- Yun Hwa Walter Wang
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Rosana D Meyer
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Philip A Bondzie
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Yan Jiang
- Department of Biochemistry and Center for Biomedical Mass Spectrometry, School of Medicine, Boston University, Boston, MA, 02118 USA
| | - Ida Rahimi
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Kobra Rezazadeh
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Manisha Mehta
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Nora M V Laver
- Department of Ophthalmology, Tufts University School of Medicine, Boston, MA 02116, USA
| | - Catherine E Costello
- Department of Biochemistry and Center for Biomedical Mass Spectrometry, School of Medicine, Boston University, Boston, MA, 02118 USA
| | - Nader Rahimi
- Department of Pathology, Boston University School of Medicine, Boston, MA 02118, USA.
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