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Articles by T Matsumoto
Total Records ( 10 ) for T Matsumoto
  J. Y Park , P. y Wang , T Matsumoto , H. J Sung , W Ma , J. W Choi , S. A Anderson , S. C Leary , R. S Balaban , J. G Kang and P. M. Hwang
 

Rationale: Exercise capacity is a physiological characteristic associated with protection from both cardiovascular and all-cause mortality. p53 regulates mitochondrial function and its deletion markedly diminishes exercise capacity, but the underlying genetic mechanism orchestrating this is unclear. Understanding the biology of how p53 improves exercise capacity may provide useful insights for improving both cardiovascular as well as general health.

Objective: The purpose of this study was to understand the genetic mechanism by which p53 regulates aerobic exercise capacity.

Methods and Results: Using a variety of physiological, metabolic, and molecular techniques, we further characterized maximum exercise capacity and the effects of training, measured various nonmitochondrial and mitochondrial determinants of exercise capacity, and examined putative regulators of mitochondrial biogenesis. As p53 did not affect baseline cardiac function or inotropic reserve, we focused on the involvement of skeletal muscle and now report a wider role for p53 in modulating skeletal muscle mitochondrial function. p53 interacts with Mitochondrial Transcription Factor A (TFAM), a nuclear-encoded gene important for mitochondrial DNA (mtDNA) transcription and maintenance, and regulates mtDNA content. The increased mtDNA in p53+/+ compared to p53–/– mice was more marked in aerobic versus glycolytic skeletal muscle groups with no significant changes in cardiac tissue. These in vivo observations were further supported by in vitro studies showing overexpression of p53 in mouse myoblasts increases both TFAM and mtDNA levels whereas depletion of TFAM by shRNA decreases mtDNA content.

Conclusions: Our current findings indicate that p53 promotes aerobic metabolism and exercise capacity by using different mitochondrial genes and mechanisms in a tissue-specific manner.

  Y Abe , H Wada , E Yamada , M Noda , M Ikejiri , J Nishioka , T Kobayashi , T Matsumoto , M Masuya , S Isaji , M Usui , S Uemoto , N Katayama and T. Nobori
 

Thrombotic microangiopathy (TMA) or thrombotic thrombocytopenic purpura (TTP) is a life-threatening syndrome characterized by increased number of fragmented red cells (FRCs) and thrombocytopenia. FRCs can be measured using the recently developed automated hematology analyzer XE-2100. The normal range for FRCs is 0% to 0.205%, as determined by the automated hematology analyzer XE-2100. The FRC count is significantly elevated in patients with TMA associated with liver transplantation, bone marrow transplantation, or TTP. In patients with TMA after liver transplantation, the FRC count is significantly higher than in those without TMA. In receiver operating characteristic analysis for the diagnosis of TMA, the area under the curve is 0.986, suggesting that FRC is a useful marker for the diagnosis of TMA. When the cutoff value of FRC for TMA is 1.2%, the sensitivity is 90% and the specificity is 96%, indicating that FRC is the most useful screening test for the diagnosis of TMA.

  T Matsumoto , S Terai , T Oishi , S Kuwashiro , K Fujisawa , N Yamamoto , Y Fujita , Y Hamamoto , M Furutani Seiki , H Nishina and I. Sakaida
  Toshihiko Matsumoto, Shuji Terai, Toshiyuki Oishi, Shinya Kuwashiro, Koichi Fujisawa, Naoki Yamamoto, Yusuke Fujita, Yoshihiko Hamamoto, Makoto Furutani-Seiki, Hiroshi Nishina, and Isao Sakaida

The global incidence of nonalcoholic steatohepatitis (NASH) is increasing and current mammalian models of NASH are imperfect. We have developed a NASH model in the ricefish medaka (Oryzias latipes), which is based on feeding the fish a high-fat diet (HFD). Medaka that are fed a HFD (HFD-medaka) exhibited hyperlipidemia and hyperglycemia, and histological examination of the liver revealed ballooning degeneration. The expression of lipogenic genes (SREBP-1c, FAS and ACC1) was increased, whereas the expression of lipolytic genes (PPARA and CPT1) was decreased. With respect to liver fatty acid composition, the concentrations of n-3 polyunsaturated fatty acids (PUFAs) and n-6 PUFAs had declined and the n-3:n-6 ratio was reduced. Treatment of HFD-medaka with the n-3 PUFA eicosapentaenoic acid (EPA) mitigated disease, as judged by the restoration of normal liver fatty acid composition and normal expression levels of lipogenic and lipolytic genes. Moreover, medaka that were fed a diet deficient in n-3 PUFAs developed NASH features. Thus, NASH can be induced in medaka by a HFD, and the proportion of n-3 PUFAs in the liver influences the progress of NASH pathology in these fish. Our model should prove helpful for the dissection of the causes of human NASH and for the design of new and effective therapies.

  T Matsumoto , K Minegishi , H Ishimoto , M Tanaka , J. D Hennebold , T Teranishi , Y Hattori , M Furuya , T Higuchi , S Asai , S. H Kim , K Miyakoshi and Y. Yoshimura
 

Ovary-specific acidic protein (OSAP) is a novel molecule discovered from a genomic project designed to identify ovary-selective genes in mice. Whereas public databases suggest extraovarian expression of OSAP, its tissue distribution has not yet been well documented. Thus, the expression profile of mouse and human OSAP was determined by quantitative real-time RT-PCR using RNAs isolated from various tissues. The results demonstrate that the human and mouse OSAP expression profiles are similar; OSAP is prominently expressed in steroidogenic tissues with the highest level of expression observed in the adrenal gland. Placenta served as an exception and possessed minimal level of OSAP mRNA. Immunohistochemical studies show that mouse OSAP localizes almost exclusively to the steroid-producing cells of the ovary, adrenal gland, and testis. Consistent with predictions made by several subcellular localization algorithms, dual labeling studies in Y-1 mouse adrenocortical cells indicate OSAP resides in the mitochondria. Because of its abundant expression in steroidogenic cells and mitochondrial localization, a role for OSAP in steroidogenesis was determined. OSAP silencing by specific small interfering RNAs significantly inhibits 8-bromoadenosine-cAMP-induced progesterone production in Y-1 cells. Reduction in OSAP levels results in mitochondrial fragmentation and a decrease in the cellular content of mitochondrial DNA, indicative of decreased mitochondrial abundance. Lastly, 8-bromoadenosine-cAMP does not regulate OSAP protein expression in Y-1 cells as is the case for other steroidogenic components known to be induced by cAMP. Collectively these results suggest that OSAP is involved in steroidogenesis, potentially through its ability to maintain mitochondrial abundance and morphology.

  K Kawa , H Tsutsui , R Uchiyama , J Kato , K Matsui , Y Iwakura , T Matsumoto and K. Nakanishi
 

Hyper-coagulation, hypothermia, systemic inflammatory responses and shock are major clinical manifestations of endotoxin shock syndrome in human. As previously reported, mice primed with heat-killed Propionibacterium acnes are highly susceptible to the action of LPS to induce tumour necrosis factor (TNF)- and to that of TNF- to trigger lethal shock. Here we investigated the mechanisms underlying the P. acnes-induced sensitization to LPS and TNF- and the development of individual symptoms after subsequent challenge with LPS or TNF-. Propionibacterium acnes-primed wild-type (WT) mice, but not naive mice, exhibited hyper-coagulation with elevated levels of thrombin–antithrombin complexes and anti-fibrinolytic plasminogen activator inhibitor 1 in their plasma, hypothermia, systemic inflammatory responses and high mortality rate after LPS or TNF- challenge. Propionibacterium acnes treatment reportedly induces both Th1 and Th17 cell development. Propionibacterium acnes-primed Il12p40–/– and Ifn–/– mice, while not Il17A–/– mice, evaded all these symptoms/signs upon LPS or TNF- challenge, indicating essential requirement of IL-12–IFN- axis for the sensitization to LPS and TNF-. Furthermore, IFN- blockade just before LPS challenge could prevent P. acnes-primed WT mice from endotoxin shock syndrome. These results demonstrated requirement of IFN- to the development of endotoxin shock and suggested it as a potent therapeutic target for the treatment of septic shock.

  K Harada , H Matsuoka , N Fujimoto , Y Endo , Y Hasegawa , A Matsuo , Y Kikuchi , T Matsumoto and M. Inoue
 

The localization of the type-2 angiotensin II receptor (AT2) in the adrenal glands of rats, guinea pigs, bovines, and humans was examined at the mRNA and protein levels. PCR products for AT2 were detected in the adrenal cortices and adrenal medullae of all the mammals examined with an RT-PCR technique. Three different anti-AT2 antibodies (Abs), whose specificity was confirmed in our hands, recognized a 50-kDa protein in the adrenal glands of the four mammals, and this recognition was abolished by the preabsorption of an Ab with an antigen. Immunoblotting and immunohistochemistry revealed that the 50-kDa protein was expressed consistently and variably in the adrenal cortices and medullae of various mammals, respectively. We conclude that the 50-kDa AT2 is consistently expressed in the adrenal cortex in a wide variety of mammals. (J Histochem Cytochem 58:585–593, 2010)

  S Miyagawa , Y Satoh , R Haraguchi , K Suzuki , T Iguchi , M. M Taketo , N Nakagata , T Matsumoto , K. i Takeyama , S Kato and G. Yamada
 

In most mammals, the sexually dimorphic development of embryos is typically achieved by the differentiation of the external genitalia. Hence, the sexual distinction of mammalian newborns is based on the external genital structure. Although it was shown in the 1940s and 1950s that androgen from the testes establishes the male sexual characteristics, the involvement of nongonadal and locally produced masculine effectors remains totally unknown. It is noteworthy that the disorders of fetal masculinization, including hypospadias, one of the most frequent birth defects, occur at a high frequency. Furthermore, their causative factors remain unclear. In this study, the involvement of the coordinated actions of androgen and the growth factor systems was genetically analyzed for the first time on mammalian reproductive organ formation. The results demonstrated that the Wnt/β-catenin pathway is indispensable masculine factor for the external genital development. The bilateral mesenchymal region adjacent to the urethral plate epithelium displayed a sexually dimorphic activity of Wnt/β-catenin signaling. Loss- and gain-of-function β-catenin mutants displayed altered sexual development of the external genitalia. These results indicate the novel functions of the Wnt/β-catenin pathway as a locally expressed masculine effector. This could be the first genetic study analyzing the roles of the genetic interactions between androgen and locally expressed growth factor signaling during the development of reproductive organs. These results also shed new insight on the reproductive genetics and the causative factors of genital disorders.

  A Kasai , S Ohnishi , H Yamazaki , H Funatsuki , T Kurauchi , T Matsumoto , S Yumoto and M. Senda
 

Seed coat pigmentation is inhibited in yellow soybean. The I gene inhibits pigmentation over the entire seed coat. In yellow soybean, seed coat discoloration occurs when plants are exposed to low temperatures after the onset of flowering, a phenomenon named ‘cold-induced discoloration (CD)’. Inhibition of seed coat pigmentation results from post-transcriptional gene silencing (PTGS) of the chalcone synthase (CHS) genes. PTGS is a sequence-specific RNA degradation mechanism in plants and occurs via short interfering RNAs (siRNAs). Similar post-transcriptional suppression is called RNAi (RNA inter-ference) in animals. Recently, we identified a candidate of the I gene designated GmIRCHS. In this study, to elucidate the molecular mechanism of CD, CHS mRNA and siRNA levels in the seed coat were compared between CD-sensitive and CD-tolerant cultivars (Toyomusume and Toyoharuka, respectively). In Toyomusume, the CHS siRNA level was reduced markedly by low temperature treatment, and subsequently the CHS mRNA level increased rapidly after treatment. In contrast, low temperature treatment did not result in severe reduction of the CHS siRNA level in Toyoharuka, and the CHS mRNA level did not increase after the treatment. These results suggest that the rapid increase in CHS mRNA level after low temperature treatment may lead to enhanced pigmentation in some of the seed coat cells and finally in seed coat discoloration. Interestingly, we found a Toyoharuka-specific difference in the GmIRCHS region, which may be involved in CD tolerance.

  K Kohyama , T Matsumoto and T. Imoto
 

Earlier, we formally established an effective refolding procedure for a protein by gradient removal of a solubilizer such as urea [Maeda et al. (1995) Effective renaturation of reduced lysozyme by gentle removal of urea. Protein Eng. 8, 201–205]. However, this procedure was less effective for unstable proteins. We developed here an excellent method to add protein stabilizer so as to get reasonable amounts of folded protein under the concentration of solubilizer where the unstable protein does not form aggregate. We examined many stabilizers and found that 60% of a concentrated (2.5 mg/ml) unstable protein can be refolded using 40% glycerol as the best stabilizer. This procedure can be widely applicable for the refolding of unstable proteins.

  T Matsumoto , M Ii , H Nishimura , T Shoji , Y Mifune , A Kawamoto , R Kuroda , T Fukui , Y Kawakami , T Kuroda , S. M Kwon , H Iwasaki , M Horii , A Yokoyama , A Oyamada , S. Y Lee , S Hayashi , M Kurosaka , S Takaki and T. Asahara
 

The therapeutic potential of hematopoietic stem cells/endothelial progenitor cells (HSCs/EPCs) for fracture healing has been demonstrated with evidence for enhanced vasculogenesis/angiogenesis and osteogenesis at the site of fracture. The adaptor protein Lnk has recently been identified as an essential inhibitor of stem cell factor (SCF)–cKit signaling during stem cell self-renewal, and Lnk-deficient mice demonstrate enhanced hematopoietic reconstitution. In this study, we investigated whether the loss of Lnk signaling enhances the regenerative response during fracture healing. Radiological and histological examination showed accelerated fracture healing and remodeling in Lnk-deficient mice compared with wild-type mice. Molecular, physiological, and morphological approaches showed that vasculogenesis/angiogenesis and osteogenesis were promoted in Lnk-deficient mice by the mobilization and recruitment of HSCs/EPCs via activation of the SCF–cKit signaling pathway in the perifracture zone, which established a favorable environment for bone healing and remodeling. In addition, osteoblasts (OBs) from Lnk-deficient mice had a greater potential for terminal differentiation in response to SCF–cKit signaling in vitro. These findings suggest that inhibition of Lnk may have therapeutic potential by promoting an environment conducive to vasculogenesis/angiogenesis and osteogenesis and by facilitating OB terminal differentiation, leading to enhanced fracture healing.

 
 
 
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