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Tsuji S, Matsuzaki H, Iseki M, Nagasu A, Hirano H, Ishihara K, Ueda N, Honda Y, Horiuchi T, Nishikomori R, Morita Y, Mukai T. Functional analysis of a novel G87V TNFRSF1A mutation in patients with TNF receptor-associated periodic syndrome. Clin Exp Immunol 2019; 198:416-429. [PMID: 31429073 DOI: 10.1111/cei.13365] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/14/2019] [Indexed: 12/17/2022] Open
Abstract
Tumor necrosis factor (TNF) receptor-associated periodic syndrome (TRAPS) is an autoinflammatory disease that is caused by heterozygous mutations in the TNFRSF1A gene. Although more than 150 TNFRSF1A mutations have been reported to be associated with TRAPS phenotypes only a few, such as p.Thr79Met (T79M) and cysteine mutations, have been functionally analyzed. We identified two TRAPS patients in one family harboring a novel p.Gly87Val (G87V) mutation in addition to a p.Thr90Ile (T90I) mutation in TNFRSF1A. In this study, we examined the functional features of this novel G87V mutation. In-vitro analyses using mutant TNF receptor 1 (TNF-R1)-over-expressing cells demonstrated that this mutation alters the expression and function of TNF-R1 similar to that with the previously identified pathogenic T79M mutation. Specifically, cell surface expression of the mutant TNF-R1 in transfected cells was inhibited with both G87V and T79M mutations, whereas the T90I mutation did not affect this. Moreover, peripheral blood mononuclear cells (PBMCs) from TRAPS patients harboring the G87V and T90I mutations showed increased mitochondrial reactive oxygen species (ROS). Furthermore, the effect of various Toll-like receptor (TLR) ligands on inflammatory responses was explored, revealing that PBMCs from TRAPS patients are hyper-responsive to TLR-2 and TLR-4 ligands and that interleukin (IL)-8 and granulocyte-macrophage colony-stimulating factor (GM-CSF) are likely to be involved in the pathogenesis of TRAPS. These findings suggest that the newly identified G87V mutation is one of the causative mutations of TRAPS. Our findings based on unique TRAPS-associated mutations provide novel insight for clearer understanding of inflammatory responses, which would be basic findings of developing a new therapeutic and prophylactic approach to TRAPS.
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Affiliation(s)
- S Tsuji
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - H Matsuzaki
- Department of Life Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, Shobara, Hiroshima, Japan
| | - M Iseki
- Department of Immunology and Molecular Genetics, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - A Nagasu
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - H Hirano
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - K Ishihara
- Department of Immunology and Molecular Genetics, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - N Ueda
- Department of Internal Medicine, Miyazaki Prefectural Miyazaki Hospital, Miyazaki, Japan
| | - Y Honda
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Horiuchi
- Department of Internal Medicine, Kyushu University Beppu Hospital, Beppu, Oita, Japan
| | - R Nishikomori
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Y Morita
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - T Mukai
- Department of Rheumatology, Kawasaki Medical School, Kurashiki, Okayama, Japan
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Abstract
The effect of polyamines on F1-ATPase catalyzed reactions has been studied through the use of submitochondrial particles and F1-ATPase. ATP degradation catalyzed by submitochondrial particles and F1-ATPase was inhibited by spermine and spermidine. Spermine's inhibition was much greater than spermidine's effect. In contrast, P1-ATP exchange and succinate dependent ATP synthesis catalyzed by submitochondrial particles were both stimulated by spermine. The inhibition of ATPase activity by polyamines probably occurs through polyamine's replacement of Mg2+ on ATP, for the following reasons. (a) The ATPase activity inhibited by spermine was partially recovered when Mg2+ was added. (b) Spermine bound to ATP and phospholipids but not to F1-ATPase; yet spermine inhibited the ATPase reaction catalyzed by F1-ATPase, a protein free of phospholipid. (c) The binding of spermine to ATP was inhibited by Mg2+. The ATP content in polyamine-deficient cells definitely was lower than that in normal cells. On the basis of these results, the possible role of spermine in keeping the ATP concentration at a high level is discussed.
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Affiliation(s)
- K Igarashi
- Faculty of Pharmaceutical Sciences, Chiba University
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