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Matsubara M, Osada F, Nakajima M, Imai T, Nishimura K, Oyama T, Tsukiyama K. Isomerization and dissociation of 2,3-dihydrofuran (2,3-DHF) induced by infrared free electron laser. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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102
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Uemura T, Watanabe K, Ishibashi M, Saiki R, Kuni K, Nishimura K, Toida T, Kashiwagi K, Igarashi K. Aggravation of brain infarction through an increase in acrolein production and a decrease in glutathione with aging. Biochem Biophys Res Commun 2016; 473:630-5. [PMID: 27037020 DOI: 10.1016/j.bbrc.2016.03.137] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 03/29/2016] [Indexed: 10/22/2022]
Abstract
We previously reported that tissue damage during brain infarction was mainly caused by inactivation of proteins by acrolein. This time, it was tested why brain infarction increases in parallel with aging. A mouse model of photochemically induced thrombosis (PIT) was studied using 2, 6, and 12 month-old female C57BL/6 mice. The size of brain infarction in the mouse PIT model increased with aging. The volume of brain infarction in 12 month-old mice was approximately 2-fold larger than that in 2 month-old mice. The larger brain infarction in 12 month-old mice was due to an increase in acrolein based on an increase in the activity of spermine oxidase, together with a decrease in glutathione (GSH), a major acrolein-detoxifying compound in cells, based on the decrease in one of the subunits of glutathione biosynthesizing enzymes, γ-glutamylcysteine ligase modifier subunit, with aging. The results indicate that aggravation of brain infarction with aging was mainly due to the increase in acrolein production and the decrease in GSH in brain.
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Watanabe T, Seguchi O, Yanase M, Fujita T, Sato T, Sunami H, Nakajima S, Nishimura K, Hisamatsu E, Kuroda K, Okada N, Wada K, Hata H, Ishibashi-Ueda H, Miyamoto Y, Kobayashi J, Fukushima N, Nakatani T. Relationship Between Brachial Artery Flow-Mediated Dilation and Clinical Characteristics of Heart Transplant Recipients. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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104
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Inokuchi J, Kuroiwa K, Naito S, Kakehi Y, Sugimoto M, Tanikawa T, Fujimoto H, Gotoh M, Masumori N, Ogawa O, Etoh M, Ohyama C, Yamaguchi A, Matsuyama H, Ichikawa T, Asano T, Takenaka A, Fujimoto K, Yamaguchi R, Habuchi T, Hashine K, Arai Y, Nagaoka A, Nishiyama H, Shinohara N, Niwakawa M, Egawa S, Ozono S, Kawano Y, Ishizuka O, Nishimura K, Tochigi T, Sugimura Y, Mizusawa J, Eba J. 801 The impact of ureteral ligation on clinical outcome during radical nephroureterectomy for upper urinary tract urothelial carcinoma: Multi-institutional case series study JCOG1110A. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/s1569-9056(16)60803-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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105
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Nishimura K, Kobayashi S, Tsutsui J, Kawasaki H, Katsuragawa S, Noma S, Kimura H, Egawa H, Yuzawa K, Umeshita K, Aikawa A, Uemoto S, Takahara S, Ishigooka J. Practices for Supporting and Confirming Decision-Making Involved in Kidney and Liver Donation by Related Living Donors in Japan: A Nationwide Survey. Am J Transplant 2016; 16:860-8. [PMID: 26555560 DOI: 10.1111/ajt.13515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Revised: 08/25/2015] [Accepted: 08/29/2015] [Indexed: 01/25/2023]
Abstract
This nationwide survey investigated the actual practices for supporting and confirming the decision-making involved in related living-organ donations in Japan, focusing on organ type and program size differences. Answers to a questionnaire survey were collected from 89 of the 126 (71%) kidney and 30 of the 35 (86%) liver transplantation programs in Japan that were involved in living-donor transplantations in 2013. In 70% of the kidney and 90% of the liver transplantation programs, all donors underwent "third-party" interviews to confirm their voluntariness. The most common third parties were psychiatrists (90% and 83%, respectively). Many programs engaged in practices to support decision-making by donor candidates, including guaranteeing the right to withdraw consent to donate (70% and 100%, respectively) and prescribing a set "cooling-off period" (88% and 100%, respectively). Most donors were offered care by mental health specialists (86% and 93%, respectively). Third parties were designated by more of the larger kidney transplant programs compared with the smaller programs. In conclusion, the actual practices supporting and confirming the decision to donate a living organ varied depending on the organ concerned and the number of patients in the program.
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Li VA, Dorrill R, Duvall MJ, Koblanski J, Negrashov S, Sakai M, Wipperfurth SA, Engel K, Jocher GR, Learned JG, Macchiarulo L, Matsuno S, McDonough WF, Mumm HP, Murillo J, Nishimura K, Rosen M, Usman SM, Varner GS. Invited Article: miniTimeCube. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:021301. [PMID: 26931826 DOI: 10.1063/1.4942243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present the development of the miniTimeCube (mTC), a novel compact neutrino detector. The mTC is a multipurpose detector, aiming to detect not only neutrinos but also fast/thermal neutrons. Potential applications include the counterproliferation of nuclear materials and the investigation of antineutrino short-baseline effects. The mTC is a plastic 0.2% (10)B-doped scintillator (13 cm)(3) cube surrounded by 24 Micro-Channel Plate (MCP) photon detectors, each with an 8 × 8 anode totaling 1536 individual channels/pixels viewing the scintillator. It uses custom-made electronics modules which mount on top of the MCPs, making our detector compact and able to both distinguish different types of events and reject noise in real time. The detector is currently deployed and being tested at the National Institute of Standards and Technology Center for Neutron Research nuclear reactor (20 MWth) in Gaithersburg MD. A shield for further tests is being constructed, and calibration and upgrades are ongoing. The mTC's improved spatiotemporal resolution will allow for determination of incident particle directions beyond previous capabilities.
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107
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Nakamura M, Uemura T, Saiki R, Sakamoto A, Park H, Nishimura K, Terui Y, Toida T, Kashiwagi K, Igarashi K. Toxic acrolein production due to Ca2+ influx by the NMDA receptor during stroke. Atherosclerosis 2016; 244:131-7. [DOI: 10.1016/j.atherosclerosis.2015.11.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 10/18/2015] [Accepted: 11/10/2015] [Indexed: 11/26/2022]
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108
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Kumar PJ, Nishimura K, Senna M, Düvel A, Heitjans P, Kawaguchi T, Sakamoto N, Wakiya N, Suzuki H. A novel low-temperature solid-state route for nanostructured cubic garnet Li7La3Zr2O12 and its application to Li-ion battery. RSC Adv 2016. [DOI: 10.1039/c6ra09695f] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Garnet Li7La3Zr2O12 nanoparticles with 1 mass% Al were prepared via a solid-state route at 750 °C within 3 h. A model cell sandwiched by Li and LiCoO2 exhibited initial discharge capacity of 64 μA h cm−2 μm−1, being 93% of LiCoO2 theoretical value.
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109
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Oka Y, Shimizu H, Kawasaki Y, Fujino Y, Tanno S, Uetani A, Nishimura K, Tokui Y, Horiuchi F. Restless legs syndrome/Willis–Ekbom disease among Japanese children. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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110
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Kimura G, Yonese J, Fukagai T, Kamba T, Nishimura K, Nozawa M, Parli T, Theeuwes A, Beer T, Tombal B, Ueda T. 244P Subgroup analysis of Japanese men in the PREVAIL trial of enzalutamide (ENZA) in men with chemotherapy-naïve, metastatic castration-resistant prostate cancer (mCRPC). Ann Oncol 2015. [DOI: 10.1093/annonc/mdv524.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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111
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Kawashima A, Uemura M, Nagahara A, Yamamoto Y, Takada S, Inagaki Y, Kinouchi T, Miyake O, Nakazawa S, Nishimura K, Arai H, Honda M, Okada K, Tsujihata M, Tsutahara K, Yamaguchi S, Ujike T, Fujita K, Nonomura N. 248P GnRH antagonist plus bicalutamide might be an effective therapy as initial combined androgen blockade for patients with high grade prostate cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv524.13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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112
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Haga N, Iwata H, Yamaguchi Y, Shirato T, Nishimura K, Yamane N, Shinkuma S, Natsuga K, Kondo T, Shimizu H. Mucocutaneous pyoderma gangrenosum due to trisomy 8 neutrophilic infiltrates in a patient with myelodysplastic syndrome. Br J Dermatol 2015; 174:239-41. [PMID: 26301955 DOI: 10.1111/bjd.14102] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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113
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Nishimura K, Omori M, Katsumata Y, Sato E, Kawaguchi Y, Harigai M, Yamanaka H, Ishigooka J. Psychological distress in corticosteroid-naive patients with systemic lupus erythematosus: A prospective cross-sectional study. Lupus 2015; 25:463-71. [PMID: 26527504 DOI: 10.1177/0961203315615223] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 10/12/2015] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Psychological distress, such as depression and anxiety, has been intensively studied in patients with systemic lupus erythematosus (SLE). However, those studies have mostly included patients who were treated with corticosteroids, which might themselves induce mood disturbances. We investigated psychological distress in corticosteroid-naive patients with SLE who did not exhibit any overt neuropsychiatric manifestations. METHODS Forty-three SLE in-patients with no current or past abnormal neuropsychiatric history participated in the study. Patients and 30 healthy control subjects with similar demographic and personality characteristics were administered a comprehensive battery of psychological/neuropsychological tests. The Profile of Mood States (POMS) was used to assess depression and anxiety. Results of clinical, laboratory, and neurological tests were compared with regard to their presence. RESULTS Prevalence of depression was higher in patients (n = 11, 25.6%) than in controls (n = 2, 6.7%; p = 0.035), although prevalence of anxiety did not differ across groups (patients: 34.9%, n = 15; controls: 16.7%, n = 5; p = 0.147). Using multiple logistic regression analysis, we identified avoidance coping methods (OR, 1.3; 95% CI 1.030-1.644; p = 0.027) as an independent risk factor for depression. CONCLUSION Our results indicate that depression presents more frequently in corticosteroid-naive patients with early-stage, active SLE than in the normal population, but anxiety does not. Depression may be related to psychological reactions to suffering from the disease.
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114
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Akata N, Kakiuchi H, Tamari T, Tanaka M, Kawano T, Miyake H, Uda T, Nishimura K. FWT and OBT concentrations in pine needle samples collected at Toki, Japan (1998-2012). RADIATION PROTECTION DOSIMETRY 2015; 167:210-214. [PMID: 25948831 DOI: 10.1093/rpd/ncv246] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Free water tritium (FWT) and organically bound tritium (OBT) concentrations in pine needles have been investigated to understand the regional background tritium concentration in Toki City. Samples were regularly collected from pine trees on the National Institute for Fusion Science campus (1998-2012) and the nearby Shiomi Park (SP; 2002-12). FWT and OBT concentrations of the former samples ranged from 0.33 to 0.92 and 0.41 to 1.10 Bq l(-1), respectively, while those of the latter samples ranged from 0.32 to 0.86 and 0.33 to 0.79 Bq l(-1), respectively. Results of both sampling sites were almost the same, and they have been gradually decreased year by year. Concentration level of tritium for Toki City was close to the average background level in Japan. The OBT/FWT ratios were almost 1.0. The apparent half-life of FWT in this period was estimated as almost 10 y, and that of OBT was estimated as almost 12 y; these values were almost the same as the physical half-life.
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115
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Takegami M, Watanabe M, Higashiyama A, Tatsumi Y, Nakai M, Nakao YM, Nishimura K, Kokubo Y, Miyamoto Y. Usefulness of LDL-C to HDL-C ratio in assessing risk of cardiovascular diseases: The Suita study. Eur J Public Health 2015. [DOI: 10.1093/eurpub/ckv175.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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116
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Nakamura F, Nishimura K, Watanabe M, Kokubo Y, Higashiyama A, Takegami M, Nakao YM, Nakai M, Okamura T, Miyamoto Y. Stroke risk assessment tool including chronic kidney disease improve a predictive probability. Eur J Public Health 2015. [DOI: 10.1093/eurpub/ckv175.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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117
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Uemura M, Nagahara A, Yamamoto Y, Takada S, Inagaki Y, Kinouchi T, Miyake O, Nakazawa S, Nishimura K, Arai H, Honda M, Okada K, Tsujihata M, Tsutahara K, Yamaguchi S, Kawashima A, Ujike T, Fujita K, Nonomura N. 2551 GnRH antagonist plus bicalutamide may be an effective therapy as initial combined androgen blockade for patients with high grade prostate cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31370-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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118
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Kubota Y, Higashiyama A, Imano H, Sugiyama D, Kawamura K, Kadota A, Nishimura K, Miyamatsu N, Miyamoto Y, Okamura T. Serum Polyunsaturated Fatty Acid Composition and Serum High-Sensitivity C-Reactive Protein Levels in Healthy Japanese Residents: The KOBE Study. J Nutr Health Aging 2015; 19:719-28. [PMID: 26193854 DOI: 10.1007/s12603-015-0497-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND/OBJECTIVES Serum polyunsaturated fatty acid (PUFA) composition reflects dietary intake and is related to risks for cardiovascular diseases. We hypothesized that serum n-3 PUFA composition, especially including long-chain n-3 PUFA such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), is associated with inflammatory status, which is related to increased risk for cardiovascular diseases. SUBJECTS/METHODS We investigated the relationship between serum PUFA composition and high-sensitivity C-reactive protein (hs-CRP) levels in a cross-sectional study among 1,102 healthy men and women aged 40-74 years who reside in Kobe City. Multiple linear regression models that predict hs-CRP level were prepared to confirm the contribution of serum total n-3 PUFA, long-chain n-3 PUFA, EPA and DHA compositions after adjusting for other PUFAs and atherosclerotic risk factors. RESULTS The serum n-3 PUFA, particularly long-chain n-3 PUFA, compositions were inversely associated with the hs-CRP levels. The standardized regression coefficient was -0.089 (p < 0.01) for total n-3 PUFA, -0.091 (p < 0.01) for long-chain n-3 PUFA, -0.071 (p = 0.03) for EPA, and -0.068 (p = 0.04) for DHA. The n-6 PUFA compositions were also inversely associated with the hs-CRP levels (-0.169 [p < 0.01] for total n-6 PUFA and -0.159 [p < 0.01] for linoleic acid). CONCLUSIONS The serum n-3 PUFA compositions were inversely related with the hs-CRP levels, similar associations were also observed in n-6 PUFA compositions. Our results suggest that dietary PUFA intake was inversely associated with attenuated inflammation in healthy Japanese population.
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119
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Takao H, Ishibashi T, Yuki I, Kaku S, Kan I, Nishimura K, Mori R, Watanabe M, Kanbayashi Y, Yeh Y, Irie K, Sakano T, Arita H, Oobatake T, Murayama Y. E-035 new app to support decision making during stroke emergencies: ‘join’. J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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120
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Ishibashi T, Murayama Y, Yuki I, Ebara M, Arakawa H, Irie K, Takao H, Kaku S, Kan I, Nishimura K, Suzuki T, Watanabe M, Sakamoto H. E-100 comparison of the clinical outcomes among 3 coiling generations in unruptured aneurysms. J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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121
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Sakai D, Nishimura K, Tanaka M, Nakajima D, Grad S, Alini M, Kawada H, Ando K, Mochida J. Migration of bone marrow-derived cells for endogenous repair in a new tail-looping disc degeneration model in the mouse: a pilot study. Spine J 2015; 15:1356-65. [PMID: 25459743 DOI: 10.1016/j.spinee.2013.07.491] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Revised: 03/13/2013] [Accepted: 07/30/2013] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Mobilization and homing of bone marrow-derived cells (BMCs) play a pivotal role in healing and regeneration of various tissues. However, the cellular response of BMCs in avascular tissue such as the intervertebral disc (IVD) has not been studied in detail. One of the main obstacles to this is a lack of a suitable mouse disc degeneration model. PURPOSE The purpose of this study was to establish a reproducible disc degeneration mouse model suitable for analyzing the cellular response of the disc microenvironment and to determine whether BMCs are recruited into the IVD. STUDY DESIGN An experimental animal study of disc degeneration investigating the potential of BMCs in an endogenous repair of the IVD. METHODS We transplanted whole bone marrow cells from mice ubiquitously expressing enhanced green fluorescent protein into lethally irradiated mice. Intervertebral disc degeneration was induced through uneven loading by creating a loop in the tail of these mice. The vertebral bone-disc-vertebral bone units were harvested, and BMCs were identified by immunohistochemistry. RESULTS A new disc degeneration model was established in the mouse. Applying this model in the bone marrow chimeric mice increased the number of BMCs in the peripheral bone marrow and vascular canals in the endplate, and some were found in the IVD. The migration of BMCs was related to the severity of IVD degeneration. CONCLUSIONS Although providing a new disc degeneration model in mice, the present study provides evidence to suggest that although BMCs are recruited during disc degeneration, only a limited number of BMCs migrate to the IVD, presumably because of its avascular nature. This fact provides important elements for developing new treatments as many growth factors and compounds are being tested, both in investigational levels and clinical trials to nourish resident endogenous cells during the degenerative process.
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Watanabe M, Ujiie H, Nishimura K, Kamiyama T, Abe R, Shimizu H. Mycosis fungoides associated with splenic infarction and muscle involvement. Br J Dermatol 2015; 173:1100-2. [PMID: 25994394 DOI: 10.1111/bjd.13916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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123
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Inoue D, Nagase R, Saika M, Nishimura K, Oyama M, Kitamura T. 140 THE STABILITY OF EPIGENETIC FACTOR ASXL1 IS REGULATED THROUGH UBIQUITINATION AND USP7-MEDIATED DEUBIQUITINATION. Leuk Res 2015. [DOI: 10.1016/s0145-2126(15)30141-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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124
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Yoshida T, Ezumi N, Sawada K, Tanaka Y, Tanaka M, Nishimura K. Energy Density Dependence of Hydrogen Combustion Efficiency in Atmospheric Pressure Microwave Plasma. FUSION SCIENCE AND TECHNOLOGY 2015. [DOI: 10.13182/fst14-t102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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125
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Suabjakyong P, Saiki R, Van Griensven LJLD, Higashi K, Nishimura K, Igarashi K, Toida T. Polyphenol extract from Phellinus igniarius protects against acrolein toxicity in vitro and provides protection in a mouse stroke model. PLoS One 2015; 10:e0122733. [PMID: 25811373 PMCID: PMC4374876 DOI: 10.1371/journal.pone.0122733] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 02/12/2015] [Indexed: 11/22/2022] Open
Abstract
The basidiomycetous mushroom Phellinus igniarius (L.) Quel. has been used as traditional medicine in various Asian countries for many years. Although many reports exist on its anti-oxidative and anti-inflammatory activities and therapeutic effects against various diseases, our current knowledge of its effect on stroke is very limited. Stroke is a neurodegenerative disorder in which oxidative stress is a key hallmark. Following the 2005 discovery by Igarashi's group that acrolein produced from polyamines in vivo is a major cause of cell damage by oxidative stress, we now describe the effects of anti-oxidative extracts from P. igniarius on symptoms of experimentally induced stroke in mice. The toxicity of acrolein was compared with that of hydrogen peroxide in a mouse mammary carcinoma cell line (FM3A). We found that the complete inhibition of FM3A cell growth by 5 μM acrolein could be prevented by crude ethanol extract of P. igniarius at 0.5 μg/ml. Seven polyphenol compounds named 3,4-dihydroxybenzaldehyde, 4-(3,4-dihydroxyphenyl-3-buten-2one, inonoblin C, phelligridin D, inoscavin C, phelligridin C and interfungin B were identified from this ethanolic extract by LCMS and 1H NMR. Polyphenol-containing extracts of P. igniarius were then used to prevent acrolein toxicity in a mouse neuroblastoma (Neuro-2a) cell line. The results suggested that Neuro-2a cells were protected from acrolein toxicity at 2 and 5 μM by this polyphenol extract at 0.5 and 2 μg/ml, respectively. Furthermore, in mice with experimentally induced stroke, intraperitoneal treatment with P. igniarius polyphenol extract at 20 μg/kg caused a reduction of the infarction volume by 62.2% compared to untreated mice. These observations suggest that the polyphenol extract of P. igniarius could serve to prevent ischemic stroke.
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