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Qin Z, Cao H, Ni C, Han L, Wang R, Blasig R, Haseloff R, Qin Y, Lan J, Lou X, Ma P, Yao X, Wang L, Wang F, Zhu L, Lei N, Blasig IE. Claudin-12 deficiency inhibits tumor growth by impairing transendothelial migration of myeloid-derived suppressor cells. Cancer Res 2022; 82:2472-2484. [PMID: 35580275 DOI: 10.1158/0008-5472.can-21-3896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 02/23/2022] [Accepted: 05/13/2022] [Indexed: 11/16/2022]
Abstract
Migration of myeloid-derived suppressor cells (MDSCs) out of the circulation, across vascular walls, and into tumor is crucial for their immunosuppressive activity. A deeper understanding of critical junctional molecules and the regulatory mechanisms that mediate the extravasation of MDSCs could identify approaches to overcome cancer immunosuppression. In this study we used mice deficient in tight-junction protein Claudin-12 (Cldn12) compared to wild-type mice and found that loss of host Cldn12 inhibited the growth of transplanted tumors, reduced intratumoral accumulation of MDSCs, increased anti-tumor immune responses, and decreased tumor vescular density. Further studies revealed that Cldn12 expression on the cell surface of both MDSCs and endothelial cells is required for MDSCs transit across tumor vascular endothelial cells (ECs). Importantly, expression of Cldn12 in MDSCs was modulated by granulocyte-macrophage colony-stimulating factor (GM-CSF) in an AKT-dependent manner. Therefore, our results indicate that Cldn12 could serve as a promising target for restoring the anti-tumor response by interfering with MDSCs transendothelial migration.
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Affiliation(s)
- Zhihai Qin
- First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Hong Cao
- First Affiliated Hospital of Zhengzhou University, Zhenzhou, China
| | - Chen Ni
- First Affiliated Hospital of Zhengzhou University, ZhengZhou, Henan, China
| | - Le Han
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Ruoqi Wang
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Rosel Blasig
- Leibniz Institute of Molecular Pharmacology, Berlin, Germany
| | - Reiner Haseloff
- Leibniz Institute of Molecular Pharmacology, Berlin, Germany
| | - Yue Qin
- First Affiliated Hospital of Zhengzhou University, Zhenzhou, China
| | - Jie Lan
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Xiaohan Lou
- First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Pan Ma
- First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xiaohan Yao
- First Affiliated Hospital of Zhengzhou University, China
| | - Linlin Wang
- First Affiliated Hospital of Zhengzhou University, Zhenzhou, Henan, China
| | - Fei Wang
- First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Linyu Zhu
- Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | | | - Ingolf E Blasig
- Leibniz Institute of Molecular Pharmacology, Berlin, Germany
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Grune T, Blasig IE, Sitte N, Roloff B, Haseloff R, Davies KJ. Peroxynitrite increases the degradation of aconitase and other cellular proteins by proteasome. J Biol Chem 1998; 273:10857-62. [PMID: 9556559 DOI: 10.1074/jbc.273.18.10857] [Citation(s) in RCA: 208] [Impact Index Per Article: 8.0] [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: 12/26/2022] Open
Abstract
We report that exposure of aconitase to moderate concentrations of peroxynitrite, 3-morpholinosydnonimine (SIN-1; a superoxide- and nitric oxide-liberating substance), or hydrogen peroxide, inhibits the enzyme and enhances susceptibility to proteolytic digestion by the isolated 20 S proteasome. Exposure to more severe levels of oxidative stress, from these same agents, causes further inhibition of the enzymatic activity of aconitase but actually decreases its proteolytic breakdown by proteasome. It should be noted that the superoxide and nitric oxide liberated by SIN-1 decomposition react to form a steady flux of peroxynitrite. S-Nitroso-N-acetylpenicillamine, a compound that liberates nitric oxide alone, causes only a small loss of aconitase activity (25% or less) and has no effect on the proteolytic susceptibility of the enzyme. Proteasome also seems to be the main protease in cell lysates that can degrade aconitase after it has been oxidatively modified by exposure to peroxynitrite, SIN-1, or hydrogen peroxide. Using cell lysates isolated from K562 cells treated for several days with an antisense oligodeoxynucleotide to the initiation codon region of the C2 subunit of proteasome (a treatment which diminishes proteasome activity by 50-60%), the enhanced degradation of moderately damaged aconitase was essentially abolished. Other model proteins as well as complex mixtures of proteins, such as cell lysates, also exhibit enhanced proteolytic susceptibility after moderate SIN-1 treatment. Therefore we conclude that peroxynitrite reacts readily with proteins and that mild modification by peroxynitrite results in selective recognition and degradation by proteasome.
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Affiliation(s)
- T Grune
- Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, California 90089-0191, USA
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Grune T, Müller K, Zöllner S, Haseloff R, Blasig IE, David H, Siems W. Evaluation of purine nucleotide loss, lipid peroxidation and ultrastructural alterations in post-hypoxic hepatocytes. J Physiol 1997; 498 ( Pt 2):511-22. [PMID: 9032698 PMCID: PMC1159220 DOI: 10.1113/jphysiol.1997.sp021877] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
1. Hypoxic alterations in isolated rat hepatocytes were demonstrated by a 90% ATP loss during 60 min of ischaemia and temporary increases of nucleotide degradation products. 2. The oxidative stress during reoxygenation was demonstrated in these cells by a decrease in reduced glutathione (GSH) concentration (30%) and a threefold increase in lipid peroxidation products such as 4-hydroxynonenal and thiobarbituric acid-reactive substances (TBA-RSs). The tremendous GSH loss could not be balanced by the slight oxidized glutathione (GSSG) increase during reoxygenation. 3. For the first time the involvement of free radicals was directly demonstrated using electron spin resonance (ESR) spectroscopy in reoxygenated liver cells. Using the spin trap 5,5-dimethylpyrroline-1-oxide (DMPO), a carbon-centred radical and the adduct of the hydroxyl radical could be detected during early reoxygenation. 4. Morphological alteration of cells was observed, beginning during hypoxia and increasing during post-hypoxic reoxygenation. Electron microscopic findings of hypoxic and post-hypoxic cell damage included pyknosis of nuclei, spherical transformation of mitochondria and increased number of vesicles.
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Affiliation(s)
- T Grune
- Medical Faculty (Charité), Humboldt-University Berlin, Germany
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Pissarek M, Jänichen F, Blasig IE, Haseloff R, Keller T, Tapp E, Krause EG. Cardioprotective potency of the radical scavenger S-2-(3 aminopropylamino) ethylphosphorothioic acid in the post-ischaemic rat heart. Mol Cell Biochem 1995; 145:121-9. [PMID: 7675032 DOI: 10.1007/bf00935484] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
S-2-(3 aminopropylamino) ethylphosphorothioic acid (WR-2721) shown to surpass radical scavenging thiols in their radioprotective efficacy in cancer-type diseases has been tested for its protective potential in the reperfused heart. We investigated the radical scavenger properties of the compound in a radical generating system in vitro as well as in isolated rat hearts subjected to 30 min ischaemia and 30 min reperfusion with the electron-paramagnetic resonance spin trap technique. The action on high-energy phosphates is observed by means of phosphorus-31 nuclear magnetic resonance (NMR) spectroscopy while its influence on left ventricular systolic segmental length change (SSLC) during 60 min reperfusion following 60 min regional ischaemia was assessed with a fibreoptic system in anaesthetized open-chest rats. WR-2721 (0.1 mM) reduced the vascular concentration of radical adduct in isolated hearts by up to 78% (275 +/- 84% of pre-ischaemic baseline values vs 1260 +/- 413%, p < 0.05) between 5 and 12.5 min reperfusion. This was accompanied by a reduction of the left ventricular end diastolic pressure to pre-ischaemic values at 30 min of reperfusion (9 +/- 6 mmHg vs 42 +/- 8 mmHg in the absence of WR-2721, p < 0.02). An accelerated recovery of creatine phosphate levels (78 +/- 5% of pre-ischaemia values vs 41 +/- 5% within 60 min reperfusion: p < 0.05) was observed under similar conditions with NMR-spectroscopy, although the post-ischaemic tissue content of adenosine triphosphate was not affected.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M Pissarek
- Research Institute of Molecular Pharmacology, Berlin, Germany
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