1
|
Takekiyo T, Yamada N, Amo T, Nakazawa CT, Asano A, Ichimura T, Kato M, Yoshimura Y. Dissolution of Amyloid Aggregates by Direct Addition of Alkali Halides. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
2
|
Takekiyo T, Yamada N, Amo T, Asano A, Yoshimura Y. Triiodide ion-induced inhibition of amyloid aggregate formation: A case study of α-synuclein. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Sato S, Noda S, Torii S, Amo T, Ikeda A, Funayama M, Yamaguchi J, Fukuda T, Kondo H, Tada N, Arakawa S, Watanabe M, Uchiyama Y, Shimizu S, Hattori N. Homeostatic p62 levels and inclusion body formation in CHCHD2 knockout mice. Hum Mol Genet 2021; 30:443-453. [PMID: 33631794 DOI: 10.1093/hmg/ddab057] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/20/2021] [Accepted: 02/16/2021] [Indexed: 01/20/2023] Open
Abstract
Inactivation of constitutive autophagy results in the formation of cytoplasmic inclusions in neurones, but the relationship between impaired autophagy and Lewy bodies (LBs) remains unknown. α-Synuclein and p62, components of LBs, are the defining characteristic of Parkinson's disease (PD). Until now, we have analyzed mice models and demonstrated p62 aggregates derived from an autophagic defect might serve as 'seeds' and can potentially be a cause of LB formation. P62 may be the key molecule for aggregate formation. To understand the mechanisms of LBs, we analyzed p62 homeostasis and inclusion formation using PD model mice. In PARK22-linked PD, intrinsically disordered mutant CHCHD2 initiates Lewy pathology. To determine the function of CHCHD2 for inclusions formation, we generated Chchd2-knockout (KO) mice and characterized the age-related pathological and motor phenotypes. Chchd2 KO mice exhibited p62 inclusion formation and dopaminergic neuronal loss in an age-dependent manner. These changes were associated with a reduction in mitochondria complex activity and abrogation of inner mitochondria structure. In particular, the OPA1 proteins, which regulate fusion of mitochondrial inner membranes, were immature in the mitochondria of CHCHD2-deficient mice. CHCHD2 regulates mitochondrial morphology and p62 homeostasis by controlling the level of OPA1. Our findings highlight the unexpected role of the homeostatic level of p62, which is regulated by a non-autophagic system, in controlling intracellular inclusion body formation, and indicate that the pathologic processes associated with the mitochondrial proteolytic system are crucial for loss of DA neurones.
Collapse
Affiliation(s)
- Shigeto Sato
- Department of Neurology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Sachiko Noda
- Department of Neurology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Satoru Torii
- Department of Pathological Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Taku Amo
- Department of Applied Chemistry, National Defense Academy, Yokosuka 239-8686, Japan
| | - Aya Ikeda
- Department of Neurology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Manabu Funayama
- Research Institute for Diseases of Old Age, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Junji Yamaguchi
- Department of Cellular and Molecular Neuropathology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan.,Laboratory of Morphology and Image Analysis, Research Support Center, Juntendo University Graduate School of Medicine, 113-8421, Japan
| | - Takahiro Fukuda
- Division of Neuropathology, Department of Neuropathology, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Hiromi Kondo
- Histology Center, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Norihiro Tada
- Atopy Research Center, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Satoko Arakawa
- Department of Pathological Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Masahiko Watanabe
- Department of Anatomy, Faculty of Medicine, Hokkaido University, Sapporo 060-8638, Japan
| | - Yasuo Uchiyama
- Department of Cellular and Molecular Neuropathology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Shigeomi Shimizu
- Department of Pathological Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| |
Collapse
|
4
|
Amo T, Oji Y, Saiki S, Hattori N. Metabolomic analysis data of MPP +-exposed SH-SY5Y cells using CE-TOFMS. Data Brief 2021; 34:106707. [PMID: 33457479 PMCID: PMC7797368 DOI: 10.1016/j.dib.2020.106707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/14/2020] [Accepted: 12/28/2020] [Indexed: 11/15/2022] Open
Abstract
1-Methyl-4-phenylpyridinium (MPP+)-treated human neuroblastoma SH-SY5Y cells have been generally accepted as a cellular model for Parkinson's disease. This article contains metabolic analysis data of not only cell lysate but also culture supernatants to understand comprehensive metabolic disturbances in this model. Metabolic analysis employed by capillary electrophoresis time-of-flight mass spectrometry (CE-TOFMS). Data obtained by CE-TOFMS were processed to extract peak information including m/z, peak area, and migration time. The data provided in this manuscript have been analyzed and discussed in the research article entitled “Metabolomic analysis revealed mitochondrial dysfunction and aberrant choline metabolism in MPP+-exposed SH-SY5Y cells” [1].
Collapse
Affiliation(s)
- Taku Amo
- Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
| | - Yutaka Oji
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Shinji Saiki
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
- Corresponding authors.
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
- Corresponding authors.
| |
Collapse
|
5
|
|
6
|
Takekiyo T, Yamada N, Nakazawa CT, Amo T, Asano A, Yoshimura Y. Formation of α-synuclein aggregates in aqueous ethylammonium nitrate solutions. Biopolymers 2020; 111:e23352. [PMID: 32203628 DOI: 10.1002/bip.23352] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 02/27/2020] [Accepted: 02/28/2020] [Indexed: 02/04/2023]
Abstract
The effect of adding ethylammonium nitrate (EAN), which is an ionic liquid (IL), on the aggregate formation of α-synuclein (α-Syn) in aqueous solution has been investigated. FTIR and Raman spectroscopy were used to investigate changes in the secondary structure of α-Syn and in the states of water molecules and EAN. The results presented here show that the addition of EAN to α-Syn causes the formation of an intermolecular β-sheet structure in the following manner: native disordered state → polyproline II (PPII)-helix → intermolecular β-sheet (α-Syn amyloid-like aggregates: α-SynA). Although cations and anions of EAN play roles in masking the charged side chains and PPII-helix-forming ability involved in the formation of α-SynA, water molecules are not directly related to its formation. We conclude that EAN-induced α-Syn amyloid-like aggregates form at hydrophobic associations in the middle of the molecules after masking the charged side chains at the N- and C-terminals of α-Syn.
Collapse
Affiliation(s)
- Takahiro Takekiyo
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| | - Natsuki Yamada
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| | - Chikako T Nakazawa
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| | - Taku Amo
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| | - Atsushi Asano
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| | - Yukihiro Yoshimura
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan
| |
Collapse
|
7
|
Takekiyo T, Yamada N, Amo T, Yoshimura Y. Cover Image, Volume 112, Issue 2. Pept Sci (Hoboken) 2020. [DOI: 10.1002/pep2.24151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
8
|
Amo T, Oji Y, Saiki S, Hattori N. Metabolomic analysis revealed mitochondrial dysfunction and aberrant choline metabolism in MPP+-exposed SH-SY5Y cells. Biochem Biophys Res Commun 2019; 519:540-546. [DOI: 10.1016/j.bbrc.2019.09.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 09/09/2019] [Indexed: 11/29/2022]
|
9
|
Funayama M, Park J, Amo T, Funayama T, Akamatsu W, Sue C, Hattori N. CHCHD2 deficiency leads to mitochondrial dysfunction and increasing oxidative stress in human neuroblastoma SH-SY5Y cells. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Saiki S, Hatano T, Fujimaki M, Ishikawa KI, Mori A, Oji Y, Okuzumi A, Fukuhara T, Koinuma T, Imamichi Y, Nagumo M, Furuya N, Nojiri S, Amo T, Yamashiro K, Hattori N. Decreased long-chain acylcarnitines from insufficient β-oxidation as potential early diagnostic markers for Parkinson's disease. Sci Rep 2017; 7:7328. [PMID: 28779141 PMCID: PMC5544708 DOI: 10.1038/s41598-017-06767-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 06/19/2017] [Indexed: 01/09/2023] Open
Abstract
Increasing evidence shows that metabolic abnormalities in body fluids are distinguishing features of the pathophysiology of Parkinson’s disease. However, a non-invasive approach has not been established in the earliest or pre-symptomatic phases. Here, we report comprehensive double-cohort analyses of the metabolome using capillary electrophoresis/liquid chromatography mass-spectrometry. The plasma analyses identified 18 Parkinson’s disease-specific metabolites and revealed decreased levels of seven long-chain acylcarnitines in two Parkinson’s disease cohorts (n = 109, 145) compared with controls (n = 32, 45), respectively. Furthermore, statistically significant decreases in five long-chain acylcarnitines were detected in Hoehn and Yahr stage I. Likewise, decreased levels of acylcarnitine(16:0), a decreased ratio of acylcarnitine(16:0) to fatty acid(16:0), and an increased index of carnitine palmitoyltransferase 1 were identified in Hoehn and Yahr stage I of both cohorts, suggesting of initial β-oxidation suppression. Receiver operating characteristic curves produced using 12–14 long-chain acylcarnitines provided a large area of under the curve, high specificity and moderate sensitivity for diagnosing Parkinson’s disease. Our data demonstrate that a primary decrement of mitochondrial β-oxidation and that 12–14 long-chain acylcarnitines decreases would be promising diagnostic biomarkers for Parkinson’s disease.
Collapse
Affiliation(s)
- Shinji Saiki
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Taku Hatano
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Motoki Fujimaki
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Kei-Ichi Ishikawa
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Akio Mori
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Yutaka Oji
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Ayami Okuzumi
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Takeshi Fukuhara
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Takahiro Koinuma
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Yoko Imamichi
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Miho Nagumo
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Norihiko Furuya
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan.,Department of Research and Therapeutics for Movement Disorders, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Shuko Nojiri
- Clinical Research Center, Juntendo University, Bunkyo, Tokyo, 113-8421, Japan
| | - Taku Amo
- Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, 239-8686, Japan
| | - Kazuo Yamashiro
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan. .,Department of Research and Therapeutics for Movement Disorders, Juntendo University School of Medicine, Bunkyo, Tokyo, 113-8421, Japan.
| |
Collapse
|
11
|
Funayama M, Ohe K, Amo T, Furuya N, Yamaguchi J, Saiki S, Li Y, Ogaki K, Ando M, Yoshino H, Tomiyama H, Nishioka K, Hasegawa K, Saiki H, Satake W, Mogushi K, Sasaki R, Kokubo Y, Kuzuhara S, Toda T, Mizuno Y, Uchiyama Y, Ohno K, Hattori N. CHCHD2 mutations in autosomal dominant late-onset Parkinson's disease: a genome-wide linkage and sequencing study. Lancet Neurol 2015; 14:274-82. [DOI: 10.1016/s1474-4422(14)70266-2] [Citation(s) in RCA: 189] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
12
|
Amo T, Saiki S, Sawayama T, Sato S, Hattori N. Detailed analysis of mitochondrial respiratory chain defects caused by loss of PINK1. Neurosci Lett 2014; 580:37-40. [PMID: 25092611 DOI: 10.1016/j.neulet.2014.07.045] [Citation(s) in RCA: 28] [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: 05/06/2014] [Revised: 07/10/2014] [Accepted: 07/25/2014] [Indexed: 11/26/2022]
Abstract
Mutations in PTEN-induced putative kinase 1 (PINK1) cause recessive forms of Parkinson's disease (PD). PINK1 acts upstream of parkin, regulating mitochondrial elimination (mitophagy) in cultured cells treated with mitochondrial uncouplers that cause mitochondrial depolarization. PINK1 loss-of-function decreases mitochondrial membrane potential, resulting in mitochondrial dysfunction, although the exact function of PINK1 in mitochondria has not been fully elucidated. We have previously found that PINK1 deficiency causes a decrease in mitochondrial membrane potential, which is not due to a proton leak, but to respiratory chain defects. Here, we examine mitochondrial respiratory chain defects in PINK1-deficient cells, and find both complex I and complex III are defective. These results suggest that mitochondrial respiratory chain defects may be associated with PD pathogenesis caused by mutations in the PINK1 gene.
Collapse
Affiliation(s)
- Taku Amo
- Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan.
| | - Shinji Saiki
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Tadashi Sawayama
- Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
| | - Shigeto Sato
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| |
Collapse
|
13
|
Chihara N, Amo T, Tokunaga A, Yuzuriha R, Wolf AM, Asoh S, Suzuki H, Uchida E, Ohta S. Mitochondrial DNA alterations in colorectal cancer cell lines. J NIPPON MED SCH 2011; 78:13-21. [PMID: 21389643 DOI: 10.1272/jnms.78.13] [Citation(s) in RCA: 7] [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] [Indexed: 11/19/2022]
Abstract
Somatic mutations of mitochondrial DNA (mtDNA) have been reported in different types of cancers and are suggested to play roles in metastasis, cancer development and response to anticancer agents. To predict potential roles of mtDNA alterations in colorectal cancer, we determined the entire mtDNA sequence of eleven human-derived colorectal cancer cell lines and compared with the revised Cambridge Reference Sequence to identify nucleotide alterations. Four homoplasmic and six heteroplasmic alterations were found to be novel. Among them, homoplasmic G6709A (MT-CO1) and G14804A (MT-CYB) alterations cause amino acid changes in the highly conserved residues. Heteroplasmic G1576A (MT-RNR1) and G2975A (MT-RNR2) alterations are expected to make the stem structure of mitochondrial ribosomal RNAs unstable. These nucleotide alterations are candidates that could play important roles in cancer.
Collapse
Affiliation(s)
- Naoto Chihara
- Department of Biochemistry and Cell Biology, Institute of Development and Aging Sciences, Graduate School of Medicine, Nippon Medical School, Kanagawa, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Shinmura K, Tamaki K, Sano M, Nakashima-Kamimura N, Wolf AM, Amo T, Ohta S, Katsumata Y, Fukuda K, Ishiwata K, Suematsu M, Adachi T. Caloric restriction primes mitochondria for ischemic stress by deacetylating specific mitochondrial proteins of the electron transport chain. Circ Res 2011; 109:396-406. [PMID: 21700931 DOI: 10.1161/circresaha.111.243097] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
RATIONALE Caloric restriction (CR) confers cardioprotection against ischemia/reperfusion injury. However, the exact mechanism(s) underlying CR-induced cardioprotection remain(s) unknown. Recent evidence indicates that Sirtuins, NAD(+)-dependent deacetylases, regulate various favorable aspects of the CR response. Thus, we hypothesized that deacetylation of specific mitochondrial proteins during CR preserves mitochondrial function and attenuates production of reactive oxygen species during ischemia/reperfusion. OBJECTIVE The objectives of the present study were (1) to investigate the effect of CR on mitochondrial function and mitochondrial proteome and (2) to investigate what molecular mechanisms mediate CR-induced cardioprotection. METHODS AND RESULTS Male 26-week-old Fischer344 rats were randomly divided into ad libitum-fed and CR (40% reduction) groups for 6 months. No change was observed in basal mitochondrial function, but CR preserved postischemic mitochondrial respiration and attenuated postischemic mitochondrial H(2)O(2) production. CR decreased the level of acetylated mitochondrial proteins that were associated with enhanced Sirtuin activity in the mitochondrial fraction. We confirmed a significant decrease in the acetylated forms of NDUFS1 and cytochrome bc1 complex Rieske subunit in the CR heart. Low-dose resveratrol treatment mimicked the effect of CR on deacetylating them and attenuated reactive oxygen species production during anoxia/reoxygenation in cultured cardiomyocytes without changing the expression levels of manganese superoxide dismutase. Treatment with nicotinamide completely abrogated the effect of low-dose resveratrol. CONCLUSIONS These results strongly suggest that CR primes mitochondria for stress resistance by deacetylating specific mitochondrial proteins of the electron transport chain. Targeted deacetylation of NDUFS1 and/or Rieske subunit might have potential as a novel therapeutic approach for cardioprotection against ischemia/reperfusion.
Collapse
Affiliation(s)
- Ken Shinmura
- Division of Geriatric Medicine, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Toyomizu M, Kikusato M, Kawabata Y, Azad MAK, Inui E, Amo T. Meat-type chickens have a higher efficiency of mitochondrial oxidative phosphorylation than laying-type chickens. Comp Biochem Physiol A Mol Integr Physiol 2011; 159:75-81. [PMID: 21300168 DOI: 10.1016/j.cbpa.2011.01.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 01/17/2011] [Accepted: 01/29/2011] [Indexed: 11/29/2022]
Abstract
Meat-type chickens show high feed efficiency and have a very rapid growth rate compared with laying-type chickens. To clarify whether the type-specific difference in feed conversion efficiency is involved in mitochondrial bioenergetics, modular kinetic analysis was applied to oxidative phosphorylation in skeletal muscle mitochondria of both type chickens. Mitochondria from skeletal muscle of meat-type chickens showed greater substrate oxidation and phosphorylating activities, and less proton leak than those of the laying-type, resulting in a higher efficiency of oxidative phosphorylation. Gene expression and protein content of uncoupling protein (avUCP) but not adenine nucleotide translocase (avANT) gene expression were lower in skeletal muscle mitochondria of meat-type chickens than the laying-type. The current results regarding a higher efficiency of oxidative phosphorylation and UCP content may partially support the high feed efficiency of meat-type chickens.
Collapse
Affiliation(s)
- Masaaki Toyomizu
- Science of Biological Function, Life Science, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan.
| | | | | | | | | | | |
Collapse
|
16
|
Amo T, Sato S, Saiki S, Wolf AM, Toyomizu M, Gautier CA, Shen J, Ohta S, Hattori N. Mitochondrial membrane potential decrease caused by loss of PINK1 is not due to proton leak, but to respiratory chain defects. Neurobiol Dis 2010; 41:111-8. [PMID: 20817094 DOI: 10.1016/j.nbd.2010.08.027] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 08/17/2010] [Accepted: 08/25/2010] [Indexed: 10/19/2022] Open
Abstract
Mutations in PTEN-induced putative kinase 1 (PINK1) cause a recessive form of Parkinson's disease (PD). PINK1 is associated with mitochondrial quality control and its partial knock-down induces mitochondrial dysfunction including decreased membrane potential and increased vulnerability against mitochondrial toxins, but the exact function of PINK1 in mitochondria has not been investigated using cells with null expression of PINK1. Here, we show that loss of PINK1 caused mitochondrial dysfunction. In PINK1-deficient (PINK1(-/-)) mouse embryonic fibroblasts (MEFs), mitochondrial membrane potential and cellular ATP levels were decreased compared with those in littermate wild-type MEFs. However, mitochondrial proton leak, which reduces membrane potential in the absence of ATP synthesis, was not altered by loss of PINK1. Instead, activity of the respiratory chain, which produces the membrane potential by oxidizing substrates using oxygen, declined. H(2)O(2) production rate by PINK1(-/-) mitochondria was lower than PINK1(+/+) mitochondria as a consequence of decreased oxygen consumption rate, while the proportion (H(2)O(2) production rate per oxygen consumption rate) was higher. These results suggest that mitochondrial dysfunctions in PD pathogenesis are caused not by proton leak, but by respiratory chain defects.
Collapse
Affiliation(s)
- Taku Amo
- Department of Biochemistry and Cell Biology, Institute of Development and Aging Sciences, Graduate School of Medicine, Nippon Medical School, 1-396 Kosugi-cho, Nakahara-ku, Kawasaki 211-8533, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Nishino N, Tamori Y, Tateya S, Kawaguchi T, Shibakusa T, Mizunoya W, Inoue K, Kitazawa R, Kitazawa S, Matsuki Y, Hiramatsu R, Masubuchi S, Omachi A, Kimura K, Saito M, Amo T, Ohta S, Yamaguchi T, Osumi T, Cheng J, Fujimoto T, Nakao H, Nakao K, Aiba A, Okamura H, Fushiki T, Kasuga M. FSP27 contributes to efficient energy storage in murine white adipocytes by promoting the formation of unilocular lipid droplets. J Clin Invest 2008; 118:2808-21. [PMID: 18654663 DOI: 10.1172/jci34090] [Citation(s) in RCA: 186] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Accepted: 05/21/2008] [Indexed: 01/08/2023] Open
Abstract
White adipocytes are unique in that they contain large unilocular lipid droplets that occupy most of the cytoplasm. To identify genes involved in the maintenance of mature adipocytes, we expressed dominant-negative PPARgamma in 3T3-L1 cells and performed a microarray screen. The fat-specific protein of 27 kDa (FSP27) was strongly downregulated in this context. FSP27 expression correlated with induction of differentiation in cultured preadipocytes, and the protein localized to lipid droplets in murine white adipocytes in vivo. Ablation of FSP27 in mice resulted in the formation of multilocular lipid droplets in these cells. Furthermore, FSP27-deficient mice were protected from diet-induced obesity and insulin resistance and displayed an increased metabolic rate due to increased mitochondrial biogenesis in white adipose tissue (WAT). Depletion of FSP27 by siRNA in murine cultured white adipocytes resulted in the formation of numerous small lipid droplets, increased lipolysis, and decreased triacylglycerol storage, while expression of FSP27 in COS cells promoted the formation of large lipid droplets. Our results suggest that FSP27 contributes to efficient energy storage in WAT by promoting the formation of unilocular lipid droplets, thereby restricting lipolysis. In addition, we found that the nature of lipid accumulation in WAT appears to be associated with maintenance of energy balance and insulin sensitivity.
Collapse
Affiliation(s)
- Naonobu Nishino
- Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Amo T, Yadava N, Oh R, Nicholls DG, Brand MD. Experimental assessment of bioenergetic differences caused by the common European mitochondrial DNA haplogroups H and T. Gene 2008; 411:69-76. [PMID: 18280061 PMCID: PMC2270349 DOI: 10.1016/j.gene.2008.01.007] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2007] [Revised: 01/15/2008] [Accepted: 01/15/2008] [Indexed: 12/01/2022]
Abstract
Studies of both survival after sepsis and sperm motility in human populations have shown significant associations with common European mitochondrial DNA haplogroups, and have led to proposals that mitochondria bearing haplogroup H have different bioenergetic capacities than those bearing haplogroup T. However, the validity of such associations assumes that there are no non-random influences of nuclear genes or other factors. Here, we removed the effect of any differences in nuclear genes by constructing transmitochondrial cybrids harbouring mitochondria with either haplogroup H or haplogroup T in cultured A549 human lung carcinoma cells with identical nuclear backgrounds. We compared the bioenergetic capacities and coupling efficiencies of mitochondria isolated from these cells, and of mitochondria retained within the cells, as a critical experimental test of the hypothesis that these haplogroups affect mitochondrial bioenergetics. We found that there were no functionally-important bioenergetic differences between mitochondria bearing these haplogroups, using either isolated mitochondria or mitochondria within cells.
Collapse
Affiliation(s)
- Taku Amo
- MRC Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 0XY, UK
| | | | | | | | | |
Collapse
|
19
|
Amo T, Brand M. Were inefficient mitochondrial haplogroups selected during migrations of modern humans? A test using modular kinetic analysis of coupling in mitochondria from cybrid cell lines. Biochem J 2007; 404:345-51. [PMID: 17355224 PMCID: PMC1868799 DOI: 10.1042/bj20061609] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [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: 11/17/2022]
Abstract
We introduce a general test of the bioenergetic importance of mtDNA (mitochondrial DNA) variants: modular kinetic analysis of oxidative phosphorylation in mitochondria from cybrid cells with constant nuclear DNA but different mtDNA. We have applied this test to the hypothesis [Ruiz-Pesini, Mishmar, Brandon, Procaccio and Wallace (2004) Science 303, 223-226] that particular mtDNA haplogroups (specific combinations of polymorphisms) that cause lowered coupling efficiency, leading to generation of less ATP and more heat, were positively selected during radiations of modern humans into colder climates. Contrary to the predictions of this hypothesis, mitochondria from Arctic haplogroups had similar or even greater coupling efficiency than mitochondria from tropical haplogroups.
Collapse
Affiliation(s)
- Taku Amo
- MRC Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, U.K
| | - Martin D. Brand
- MRC Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, U.K
- To whom correspondence should be addressed (email )
| |
Collapse
|
20
|
Yamada T, Fujii T, Kanai T, Amo T, Imanaka T, Nishimasu H, Wakagi T, Shoun H, Kamekura M, Kamagata Y, Kato T, Kawashima K. Expression of acetylcholine (ACh) and ACh-synthesizing activity in Archaea. Life Sci 2005; 77:1935-44. [PMID: 15936779 DOI: 10.1016/j.lfs.2005.01.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2004] [Accepted: 01/17/2005] [Indexed: 10/25/2022]
Abstract
Acetylcholine (ACh) is known generally as the neurotransmitter in the mammalian central and peripheral cholinergic nervous systems. However, ACh is also widely expressed in non-neuronal animal tissues and in plants, fungi and bacteria, where it is likely involved in the transport of water, electrolytes and nutrients, and in modulating various other cell functions. We have investigated the expression of ACh and ACh-synthesizing activity in various strains of Archaea, which are situated between Bacteria and Eucarya in the universal phylogenetic tree. Using a sensitive and specific radioimmunoassay, differing levels of ACh were detected in the Hyperthermophiles Thermococcus kodakaraensis KOD1, Sulfolobus tokodaii strain 7 and Pyrobaculum calidifontis VA1; the Methanogens Methanothermobacter thermautotrophicus deltaH and Methanosarcina barkeri; and the Halophiles Halobacterium sp. NRC-1 and Haloferax volcanii. T. kodakaraensis KOD1 expressed the highest levels of ACh among the Archaea tested; moreover, the substance expressed was verified to be ACh using high-performance liquid chromatography with electrochemical detection. Varying degrees of ACh-synthesizing activity were also identified in all of the strains, and the activity of bromoACh-sensitive choline acetyltransferase, an enzyme responsible for ACh synthesis in the nervous system, was detected in T. kodakaraensis KOD1. Our findings demonstrate that ACh and ACh-synthesizing activity are both expressed in evolutionally old Archaea. In the context of the recent discovery of non-neuronal ACh in bacteria, fungi, plants and animals, these findings support the notion that ACh has been expressed in organisms from the origin of life on the earth, functioning as a local mediator as well as a neurotransmitter.
Collapse
Affiliation(s)
- Tomoya Yamada
- Department of Pharmacology, Kyoritsu College of Pharmacy, Tokyo 105-8512, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Amo T, Paje MLF, Inagaki A, Ezaki S, Atomi H, Imanaka T. Pyrobaculum calidifontis sp. nov., a novel hyperthermophilic archaeon that grows in atmospheric air. Archaea 2005; 1:113-21. [PMID: 15803649 PMCID: PMC2685560 DOI: 10.1155/2002/616075] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A novel, facultatively aerobic, heterotrophic hyperthermophilic archaeon was isolated from a terrestrial hot spring in the Philippines. Cells of the new isolate, strain VA1, were rod-shaped with a length of 1.5 to 10 microm and a width of 0.5 to 1.0 microm. Isolate VA1 grew optimally at 90 to 95 degrees C and pH 7.0 in atmospheric air. Oxygen served as a final electron acceptor under aerobic growth conditions, and vigorous shaking of the medium significantly enhanced growth. Elemental sulfur inhibited cell growth under aerobic growth conditions, whereas thiosulfate stimulated cell growth. Under anaerobic growth conditions, nitrate served as a final electron acceptor, but nitrite or sulfur-containing compounds such as elemental sulfur, thiosulfate, sulfate and sulfite could not act as final electron acceptors. The G+C content of the genomic DNA was 51 mol%. Phylogenetic analysis based on 16S rRNA sequences indicated that strain VA1 exhibited close relationships to species of the genus Pyrobaculum. A DNA-DNA hybridization study revealed a low level of similarity (< or = 18%) between strain VA1 and previously described members of the genus Pyrobaculum. Physiological characteristics also indicated that strain VA1 was distinct from these Pyrobaculum species. Our results indicate that isolate VA1 represents a novel species, named Pyrobaculum calidifontis.
Collapse
Affiliation(s)
- Taku Amo
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
| | - Maria Luz F. Paje
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
- National Institute of Molecular Biology and Biotechnology, University of the Philippines Los Baños, College 4031, Laguna, Philippines
| | - Akiko Inagaki
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
| | - Satoshi Ezaki
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
| | - Haruyuki Atomi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
| | - Tadayuki Imanaka
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan, and Core Research for Evolutional Science and Technology Program of Japan Science and Technology Corporation (CREST-JST), Kawaguchi, Saitama 332-0012, Japan
- Corresponding author ()
| |
Collapse
|
22
|
Amo T, Atomi H, Imanaka T. Biochemical properties and regulated gene expression of the superoxide dismutase from the facultatively aerobic hyperthermophile Pyrobaculum calidifontis. J Bacteriol 2003; 185:6340-7. [PMID: 14563869 PMCID: PMC219395 DOI: 10.1128/jb.185.21.6340-6347.2003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [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: 11/20/2022] Open
Abstract
Superoxide dismutase (SOD) was purified from a facultatively aerobic hyperthermophilic archaeon, Pyrobaculum calidifontis VA1. The purified native protein from aerobically grown cells exhibited 1,960 U of SOD activity/mg and contained 0.86 +/- 0.04 manganese and <0.01 iron atoms per subunit. The gene encoding SOD was cloned and expressed in Escherichia coli. Although the recombinant protein was soluble, little activity was observed due to the lack of metal incorporation. Reconstitution of the enzyme by heat treatment with either Mn or Fe yielded a highly active protein with specific activities of 1,970 and 434 U/mg, respectively. This indicated that the SOD from P. calidifontis was a cambialistic SOD with a preference toward Mn in terms of activity. Interestingly, reconstitution experiments in vitro indicated a higher tendency of the enzyme to incorporate Fe than Mn. When P. calidifontis was grown under anaerobic conditions, a majority of the native SOD was incorporated with Fe, indicating the cambialistic property of this enzyme in vivo. We further examined the expression levels of SOD and a previously characterized Mn catalase from this strain in the presence or absence of oxygen. Northern blot, Western blot, and activity measurement analyses revealed that both genes are expressed at much higher levels under aerobic conditions. We also detected a rapid response in the biosynthesis of these enzymes once the cells were exposed to oxygen.
Collapse
Affiliation(s)
- Taku Amo
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | | | | |
Collapse
|
23
|
Abstract
We had previously isolated a facultatively anaerobic hyperthermophilic archaeon, Pyrobaculum calidifontis strain VA1. Here, we found that strain VA1, when grown under aerobic conditions, harbors high catalase activity. The catalase was purified 91-fold from crude extracts and displayed a specific activity of 23,500 U/mg at 70 degrees C. The enzyme exhibited a K(m) value of 170 mM toward H(2)O(2) and a k(cat) value of 2.9 x 10(4) s(-1).subunit(-1) at 25 degrees C. Gel filtration chromatography indicated that the enzyme was a homotetramer with a subunit molecular mass of 33,450 Da. The purified catalase did not display the Soret band, which is an absorption band particular to heme enzymes. In contrast to typical heme catalases, the catalase was not strongly inhibited by sodium azide. Furthermore, with plasma emission spectroscopy, we found that the catalase did not contain iron but instead contained manganese. Our biochemical results indicated that the purified catalase was not a heme catalase but a manganese (nonheme) catalase, the first example in archaea. Intracellular catalase activity decreased when cells were grown anaerobically, while under aerobic conditions, an increase in activity was observed with the removal of thiosulfate from the medium, or addition of manganese. Based on the N-terminal amino acid sequence of the purified protein, we cloned and sequenced the catalase gene (kat(Pc)). The deduced amino acid sequence showed similarity with that of the manganese catalase from a thermophilic bacterium, Thermus sp. YS 8-13. Interestingly, in the complete archaeal genome sequences, no open reading frame has been assigned as a manganese catalase gene. Moreover, a homology search with the sequence of kat(Pc) revealed that no orthologue genes were present on the archaeal genomes, including those from the "aerobic" (hyper)thermophilic archaea Aeropyrum pernix, Sulfolobus solfataricus, and Sulfolobus tokodaii. Therefore, Kat(Pc) can be considered a rare example of a manganese catalase from archaea.
Collapse
Affiliation(s)
- Taku Amo
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
| | | | | |
Collapse
|
24
|
Amo T. [Nursing education as a preparation for professionalism]. Kango Kyoiku 1977; 18:269-73. [PMID: 585751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
25
|
Abstract
The authors report a case with two mycotic aneurysms in the cavernous portion of the internal carotid artery, presumably secondary to a transient bacteremia from pneumonia. The strikingly rapid development of the aneurysms was demonstrated by angiography. Painful total ophthalmoplegia and extophthalmos were the main clinical features.
Collapse
|
26
|
Shibuya S, Fukumitsu T, Watanabe T, Yoshida Y, Amo T. [Encephalography using a mixture of oxygen and nitrous oxide]. Rinsho Hoshasen 1974; 19:195-8. [PMID: 4858545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
27
|
Nishikaze U, Kobayashi M, Amo T, Matsuoka H, Sumada K. [Simple operating table for heart surgery using deep hypothermia]. Iryo 1968; 22:997-9. [PMID: 5707999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|