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van Houtum EJH, Kers-Rebel ED, Looman MW, Hooijberg E, Büll C, Granado D, Cornelissen LAM, Adema GJ. Tumor cell-intrinsic and tumor microenvironmental conditions co-determine signaling by the glycoimmune checkpoint receptor Siglec-7. Cell Mol Life Sci 2023; 80:169. [PMID: 37253806 DOI: 10.1007/s00018-023-04816-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/12/2023] [Accepted: 05/21/2023] [Indexed: 06/01/2023]
Abstract
Tumors create an immunosuppressive tumor microenvironment by altering protein expression, but also by changing their glycosylation status, like altered expression of sialoglycans. Sialoglycans are capped with sialic acid sugar residues and are recognized by Siglec immune receptors. Siglec-7 is an inhibitory immune receptor similar to PD-1, and is emerging as glycoimmune checkpoint exploited by cancer cells to evade the immune system. However, the exact cellular and molecular conditions required for Siglec-7-mediated immune cell inhibition remain largely unknown. Here, we report on the development of a chimeric Siglec-7 cell system that enables dissection of Siglec-7 signaling, rather than Siglec-7 binding. Antibody-induced clustering, sialic acid-containing polymers, and highly sialylated erythrocytes effectively induced Siglec-7 signaling, thereby validating functionality of this reporter system. Moreover, the system reveals tumor cell-dependent Siglec-7 signaling. Tumor-associated conditions important for Siglec-7 signaling were defined, such as Siglec-7 ligand expression levels, presence of the known Siglec-7 ligand CD43, and sialic acid availability for sialylation of glycans. Importantly, therapeutic targeting of the Siglec-7/sialic acid axis using a sialyltransferase inhibitor resulted in strong reduction of Siglec-7 signaling. In conclusion, using a newly established cellular tool, we defined a set of tumor-associated conditions that influence Siglec-7 signaling. Moreover, the system allows to assess the efficacy of novel cancer drugs interfering with the Siglec-7/sialic acid axis as immunotherapy to treat cancer.
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Affiliation(s)
- Eline J H van Houtum
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands
| | - Esther D Kers-Rebel
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands
| | - Maaike W Looman
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands
| | - Erik Hooijberg
- Department of Pathology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Christian Büll
- Department of Biomolecular Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Daniel Granado
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands
| | - Lenneke A M Cornelissen
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands
| | - Gosse J Adema
- Radiotherapy & OncoImmunology Laboratory, Department of Radiation Oncology, Radboud University Medical Center, Post 874, 6525 GA, Nijmegen, The Netherlands.
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Müller D, Schmitz J, Fischer K, Granado D, Groh AC, Krausel V, Lüttgenau SM, Amelung TM, Pavenstädt H, Weide T. Evolution of renal-disease factor APOL1 results in cis and trans orientations at the endoplasmic reticulum that both show cytotoxic effects. Mol Biol Evol 2021; 38:4962-4976. [PMID: 34323996 PMCID: PMC8557400 DOI: 10.1093/molbev/msab220] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The recent and exclusively in humans and a few other higher primates expressed APOL1 (apolipoprotein L1) gene is linked to African human trypanosomiasis (also known as African sleeping sickness) as well as to different forms of kidney diseases. Whereas APOL1’s role as a trypanolytic factor is well established, pathobiological mechanisms explaining its cytotoxicity in renal cells remain unclear. In this study, we compared the APOL family members using a combination of evolutionary studies and cell biological experiments to detect unique features causal for APOL1 nephrotoxic effects. We investigated available primate and mouse genome and transcriptome data to apply comparative phylogenetic and maximum likelihood selection analyses. We suggest that the APOL gene family evolved early in vertebrates and initial splitting occurred in ancestral mammals. Diversification and differentiation of functional domains continued in primates, including developing the two members APOL1 and APOL2. Their close relationship could be diagnosed by sequence similarity and a shared ancestral insertion of an AluY transposable element. Live-cell imaging analyses showed that both expressed proteins show a strong preference to localize at the endoplasmic reticulum (ER). However, glycosylation and secretion assays revealed that—unlike APOL2—APOL1 membrane insertion or association occurs in different orientations at the ER, with the disease-associated mutants facing either the luminal (cis) or cytoplasmic (trans) side of the ER. The various pools of APOL1 at the ER offer a novel perspective in explaining the broad spectrum of its observed toxic effects.
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Affiliation(s)
- Daria Müller
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Jürgen Schmitz
- Institute of Experimental Pathology, ZMBE, University of Münster, Von-Esmarch-Str. 56, Münster, D-48149, Germany
| | - Katharina Fischer
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Daniel Granado
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Ann-Christin Groh
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Vanessa Krausel
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Simona Mareike Lüttgenau
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Till Maximilian Amelung
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Hermann Pavenstädt
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
| | - Thomas Weide
- University Hospital of Münster (UKM), Internal Medicine D (MedD), Molecular Nephrology, Albert-Schweitzer-Campus 1 Building A14, Münster, 48149, Germany
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Granado D, Müller D, Krausel V, Kruzel-Davila E, Schuberth C, Eschborn M, Wedlich-Söldner R, Skorecki K, Pavenstädt H, Michgehl U, Weide T. Intracellular APOL1 Risk Variants Cause Cytotoxicity Accompanied by Energy Depletion. J Am Soc Nephrol 2017; 28:3227-3238. [PMID: 28696248 DOI: 10.1681/asn.2016111220] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 05/24/2017] [Indexed: 12/17/2022] Open
Abstract
Population genetic approaches have uncovered a strong association between kidney diseases and two sequence variants of the APOL1 gene, called APOL1 risk variant G1 and variant G2, compared with the nonrisk G0 allele. However, the mechanism whereby these variants lead to disease manifestation and, in particular, whether this involves an intracellular or extracellular pool of APOL1 remains unclear. Herein, we show a predominantly intracellular localization of APOL1 G0 and the renal risk variants, which localized to membranes of the endoplasmic reticulum in podocyte cell lines. This localization did not depend on the N-terminal signal peptide that mediates APOL1 secretion into the circulation. Additionally, a fraction of these proteins localized to structures surrounding mitochondria. In vitro overexpression of G1 or G2 lacking the signal peptide inhibited cell viability, triggered phosphorylation of stress-induced kinases, increased the phosphorylation of AMP-activated protein kinase, reduced intracellular potassium levels, and reduced mitochondrial respiration rates. These findings indicate that functions at intracellular membranes, specifically those of the endoplasmic reticulum and mitochondria, are crucial factors in APOL1 renal risk variant-mediated cell injury.
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Affiliation(s)
| | | | | | | | - Christian Schuberth
- Institute of Cell Dynamics and Imaging, and Cells in Motion (CiM) Cluster of Excellence (EXC1003), University of Münster, Münster, Germany; and
| | - Melanie Eschborn
- Department of Neurology, University Hospital of Münster, Münster, Germany
| | - Roland Wedlich-Söldner
- Institute of Cell Dynamics and Imaging, and Cells in Motion (CiM) Cluster of Excellence (EXC1003), University of Münster, Münster, Germany; and
| | - Karl Skorecki
- Department of Nephrology, Rambam Health Care Campus, Haifa, Israel.,Departments of Genetics and Developmental Biology, Rappaport Faculty of Medicine and Research Institute, Technion, Israel Institute of Technology, Haifa, Israel
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Schulze U, Vollenbröker B, Kühnl A, Granado D, Bayraktar S, Rescher U, Pavenstädt H, Weide T. Cellular vacuolization caused by overexpression of the PIKfyve-binding deficient Vac14L156R is rescued by starvation and inhibition of vacuolar-ATPase. Biochimica et Biophysica Acta (BBA) - Molecular Cell Research 2017; 1864:749-759. [DOI: 10.1016/j.bbamcr.2017.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 02/09/2017] [Accepted: 02/15/2017] [Indexed: 12/28/2022]
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Djuric I, Siebrasse JP, Schulze U, Granado D, Schlüter MA, Kubitscheck U, Pavenstädt H, Weide T. The C-terminal domain controls the mobility of Crumbs 3 isoforms. Biochimica et Biophysica Acta (BBA) - Molecular Cell Research 2016; 1863:1208-17. [DOI: 10.1016/j.bbamcr.2016.03.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 03/07/2016] [Accepted: 03/08/2016] [Indexed: 01/12/2023]
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Schulze U, Vollenbröker B, Braun DA, Van Le T, Granado D, Kremerskothen J, Fränzel B, Klosowski R, Barth J, Fufezan C, Wolters DA, Pavenstädt H, Weide T. The Vac14-interaction network is linked to regulators of the endolysosomal and autophagic pathway. Mol Cell Proteomics 2014; 13:1397-411. [PMID: 24578385 DOI: 10.1074/mcp.m113.034108] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The scaffold protein Vac14 acts in a complex with the lipid kinase PIKfyve and its counteracting phosphatase FIG4, regulating the interconversion of phosphatidylinositol-3-phosphate to phosphatidylinositol-3,5-bisphosphate. Dysfunctional Vac14 mutants, a deficiency of one of the Vac14 complex components, or inhibition of PIKfyve enzymatic activity results in the formation of large vacuoles in cells. How these vacuoles are generated and which processes are involved are only poorly understood. Here we show that ectopic overexpression of wild-type Vac14 as well as of the PIKfyve-binding deficient Vac14 L156R mutant causes vacuoles. Vac14-dependent vacuoles and PIKfyve inhibitor-dependent vacuoles resulted in elevated levels of late endosomal, lysosomal, and autophagy-associated proteins. However, only late endosomal marker proteins were bound to the membranes of these enlarged vacuoles. In order to decipher the linkage between the Vac14 complex and regulators of the endolysosomal pathway, a protein affinity approach combined with multidimensional protein identification technology was conducted, and novel molecular links were unraveled. We found and verified the interaction of Rab9 and the Rab7 GAP TBC1D15 with Vac14. The identified Rab-related interaction partners support the theory that the regulation of vesicular transport processes and phosphatidylinositol-modifying enzymes are tightly interconnected.
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Affiliation(s)
- Ulf Schulze
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Beate Vollenbröker
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Daniela A Braun
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Truc Van Le
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Daniel Granado
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Joachim Kremerskothen
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany
| | - Benjamin Fränzel
- ‖Analytical Chemistry NC4/72, Biomolecular Mass Spectrometry/Proteincenter, Ruhr-University Bochum, Universitätsstr. 150, D-44801 Bochum, Germany
| | - Rafael Klosowski
- ‖Analytical Chemistry NC4/72, Biomolecular Mass Spectrometry/Proteincenter, Ruhr-University Bochum, Universitätsstr. 150, D-44801 Bochum, Germany
| | - Johannes Barth
- ‡‡Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, D-48143 Muenster, Germany
| | - Christian Fufezan
- ‡‡Institute of Plant Biology and Biotechnology, University of Muenster, Schlossplatz 8, D-48143 Muenster, Germany
| | - Dirk A Wolters
- ‖Analytical Chemistry NC4/72, Biomolecular Mass Spectrometry/Proteincenter, Ruhr-University Bochum, Universitätsstr. 150, D-44801 Bochum, Germany
| | - Hermann Pavenstädt
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany;
| | - Thomas Weide
- From the ‡Department of Internal Medicine D, Molecular Nephrology, University Hospital of Muenster, Albert-Schweitzer Campus 1, A14, D-48149 Muenster, Germany;
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