• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

The elucidation of the apoptotic mechanism in cryopreserved bovine oocytes and the establishment of the new method for cryopreservation and in vitro culture

Research Project

Project/Area Number 23780278
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied animal science
Research InstitutionYamagata University

Principal Investigator

ABE Yasuyuki  山形大学, 理工学研究科, 助教 (80447086)

Project Period (FY) 2011 – 2013
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords発生工学 / ウシ / 卵子 / 凍結保存 / アポトーシス / ミトコンドリア / 卵母細胞 / 卵核胞期卵子 / 細胞骨格
Research Abstract

For the purpose of the improvement of the cryopreservation method in bovine oocytes (germinal vesicle stage), we analyzed the effect of the cryopreservation on oocytes. The cryopreservation changed mitochondrial and microtublar localization, as a result, mitochondrial functional decline and induction of the apoptosis occurred. Then, we were successful in increasing the rates of maturation, fertilization and development in the cryopreserved oocytes by the treatment of the cytoskeleton stabilizer and removal of the cumulus cells.
Also, for the purpose of evading a fertilization disorder of the cryopreserved oocytes, we analyzed of the factor which controlled fertility of the sperm. We found that linearity and velocity of moving, and acrosomal normality had influence to fertility of the sperm.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (50 results)

All 2014 2013 2012 2011 Other

All Journal Article (18 results) (of which Peer Reviewed: 15 results) Presentation (26 results) (of which Invited: 2 results) Book (5 results) Remarks (1 results)

  • [Journal Article] 2,6- Bis(arylsulfonyl)anilines as Fluorescent Scaffolds through Intramolecular Hydrogen Bonds : Solid- State Fluorescence Materials and Turn-On-Type Probes Based on Aggregation-Induced Emission2014

    • Author(s)
      Beppu, T., Kawata, S., Aizawa, N., Pu,Y. J., Abe, Y., Ohba, Y., Katagiri, H.
    • Journal Title

      ChemPlusChem

      Volume: 79 (4) Pages: 536-545

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] 2,6-Bis(arylsulfonyl)anilines as Fluorescent Scaffolds through Intramolecular Hydrogen Bonds : Solid-State Fluorescence Materials and Turn-On-Type Probes Based on Aggregation-Induced Emission2014

    • Author(s)
      Beppu, T., Kawata, S., Aizawa, N., Pu, Y. -J., Abe, Y., Ohba, Y., Katagiri
    • Journal Title

      ChemPlusChem

      Volume: 79 Issue: 4 Pages: 536-545

    • DOI

      10.1002/cplu.201300428

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distribution of artificial radionuclides in abandoned cattle in theeva cuation zone of the Fukushima Daiichi nuclear power plant2013

    • Author(s)
      Fukuda T, Kino Y, Abe Y, Yamashiro H, Kuwahara Y, Nihei H, Sano Y, Irisawa A, Shimura T, Fukumoto M, Shinoda H, Obata Y, Saigusa S, Sekine T, Isogai E, Fukumoto M.
    • Journal Title

      PLoS One

      Volume: 8(1) Issue: 1 Pages: 1-7

    • DOI

      10.1371/journal.pone.0054312

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dynamics of intracellular phospholipid membrane organization during oocyte maturation and successful vitrification of immature oocytes retrieved by ovum pick-up in cattle2013

    • Author(s)
      Aono, A., Nagatomo, H., Takuma, T., Nonaka, R., Ono, Y., Wada, Y., Abe, Y., Watanabe, T., Kawahara, M.
    • Journal Title

      Theriogenology

      Volume: 79 Issue: 8 Pages: 1146-1152

    • DOI

      10.1016/j.theriogenology.2013.02.009

    • NAID

      120005572429

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Effects of radioactive caesium on bull testes after the Fukushima nuclear plant accident2013

    • Author(s)
      Yamashiro, H., Abe, Y., Fukuda, T., Kino, Y., Kuwahara, Y., Fukumoto, M., Kobayashi, J., Uematsu, E., Tong, B., Sugiyama, T., Yamada, T., Shinoda, H., Sekine, T., Sato, E.
    • Journal Title

      Sci. Rep.

      Volume: (掲載決定) Issue: 1 Pages: 2850-2856

    • DOI

      10.1038/srep02850

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Transcriptional wiring for establishing cell lineage specification at the blastocyst stage in cattle2013

    • Author(s)
      Nagatomo, H., Kagawa, S., Kishi, Y., Takuma, T., Sada, A., Yamanaka, K., Abe, Y., Wada, Y., Takahashi, M., Kono, T., Kawahara, M.
    • Journal Title

      Biol. Reprod

      Volume: Jun 27;88(6) Issue: 6 Pages: 158-158

    • DOI

      10.1095/biolreprod.113.108993

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Distribution of Radioactive Cesium in Ostrich (Struthio camelus) after the Fukushima Daiichi Nuclear Power Plant Accident.2013

    • Author(s)
      Isogai, E., Kino, Y., Abe, Y., Yamashiro, H., Shinoda, H., Fukuda, T., Fukumoto, M., Kuroda, K., Yoneyama, H., Isogai, E., Sekine, T.
    • Journal Title

      Radiat. Emerg. Med.

      Volume: 2 Pages: 68-71

    • NAID

      40019745130

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 東京電力福島第一原子力発電所事故に伴う被災家畜の被ばくと放射性セシウムの体内動態2012

    • Author(s)
      磯貝恵美子,福田智一,木野康志,福本学,篠田壽,関根勉,山城秀昭,黒田健吾,米山裕,阿部靖之
    • Journal Title

      宮城県獣医師会会報

      Volume: 65(3) Pages: 125-128

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Bone morphogenetic protein 4 (BMP-4) and BMP-7 induce vascular endothelial growth factor expression in bovine granulosa cells2012

    • Author(s)
      Shimizu, T., Magata, F., Abe, Y., Miyamoto, A.
    • Journal Title

      Anim. Sci. J.

      Volume: 83(Epub 2012 Jun 27) Issue: 9 Pages: 663-667

    • DOI

      10.1111/j.1740-0929.2012.01032.x

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] 福島第一原子力発電所事故に伴う被災家畜の臓器別放射性セシウム濃度2012

    • Author(s)
      福本学,被災動物放射能評価グループ(磯貝恵美子,福田智一,木野康志,関根勉,篠田壽,桑原義和,志村勉,福本基,阿部靖之,山城秀昭,三枝新,小幡裕一)
    • Journal Title

      Isotope News

      Volume: 696(4) Pages: 10-12

    • NAID

      10030539859

    • URL

      http://www.jrias.or.jp/member/pdf/201204_TRACER_FUKUMOTO.pdf

    • Related Report
      2013 Final Research Report
  • [Journal Article] 警戒区域で何が起こっているか?牛における放射性物質の動態2012

    • Author(s)
      福本学,磯貝恵美子,福田智一,木野康志,関根勉,篠田壽,千葉美麗,鈴木敏彦,清水央,高橋温,西村真,桑原義和,志村勉,鈴木正敏,井上和也,高橋慎太郎,福本基,阿部靖之,山城秀昭,小林仁,森本素子,三枝新,小幡裕一
    • Journal Title

      家畜衛生学雑誌

      Volume: 38 Pages: 105-106

    • Related Report
      2013 Final Research Report
  • [Journal Article] 東京電力福島第一原子力発電所事故に伴う被災家畜の被ばくと放射性セシウムの体内動態2012

    • Author(s)
      磯貝恵美子,福田智一,木野康志,福本 学,篠田壽,関根 勉,山城秀昭,黒田健吾,米山 裕,阿部靖之
    • Journal Title

      宮城県獣医師会報

      Volume: 65 Pages: 125-128

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bone morphogenetic protein 4 (BMP-4) and BMP-7 induce vascular endothelial growth factor expression in bovine granulosa cells2012

    • Author(s)
      Takashi Shimizu, Yasuyuki Abe, Akio Miyamoto
    • Journal Title

      Animal Science Journal

      Volume: 印刷中

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Cryopreservation of canine embryo2011

    • Author(s)
      Abe, Y., Suwa, Y., Asano, T., Yanagimoto- Ueta, Y., Kobayashi, N., Ohshima, N., Shirasuna, S., Abdel-Ghani, M. A., Oi, M., Kobayashi, Y., Miyoshi, M., Miyahara, K., Suzuki, H.
    • Journal Title

      Biol. Reprod.

      Volume: 84(2)(Epub 2010 Oct 6) Issue: 2 Pages: 363-368

    • DOI

      10.1095/biolreprod.110.087312

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Effect of bovine cumulus-oocyte complexes-conditioned medium on in-vitro maturation of canine oocytes2011

    • Author(s)
      Abdel-Ghani, M. A., Abe, Y., Asano, T., Hamano, S., Suzuki, H.
    • Journal Title

      Reprod. Med. Biol.

      Volume: 10 Issue: 1 Pages: 43-49

    • DOI

      10.1007/s12522-010-0069-y

    • NAID

      10029042897

    • Related Report
      2013 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of graft site and gonadotrophin treatment on follicular development of canine ovarian grafts transplanted to NOD-SCID mice2011

    • Author(s)
      Abdel-Ghani, M. A., Abe, Y., Asano, T., Suzuki, H.
    • Journal Title

      Reprod. Med. Biol.

      Volume: 10 Issue: 4 Pages: 259-266

    • DOI

      10.1007/s12522-011-0091-8

    • NAID

      10030444416

    • Related Report
      2013 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] 動物の胚および卵子の凍結技術2011

    • Author(s)
      阿部靖之
    • Journal Title

      冷凍

      Volume: 86 Pages: 7-12

    • NAID

      10028122571

    • Related Report
      2013 Final Research Report 2011 Research-status Report
  • [Journal Article] Distribution of Radioactive Cesium in Ostrich (Struthio camelus) after the Fukushima Daiichi Nuclear Power Plant Accident

    • Author(s)
      Isogai, E., Kino, Y., Abe, Y., Yamashiro, H., Shinoda, H., Fukuda, T., Fukumoto, M., Kuroda, K., Yoneyama, H., Isogai, E., Sekine, T.
    • Journal Title

      Radiat. Emerg. Med.

      Volume: (掲載決定)

    • NAID

      40019745130

    • URL

      http://www.hs.hirosaki-u.ac.jp/~hibaku-pro/rem/file_pdf/2013_vol2-2/rem_vol2_2_11_tsutomu%20sekine.pdf#search='Distribution+of+Radioactive+Cesium+in+Ostrich+%28Struthio+camelus%29+after+the+Fukushima+Daiichi+Nuclear+Power+Plant+Accident.'

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Presentation] Effects of radiation on abandoned bull associated with Fukushirna Nuclear Power Plant accident2013

    • Author(s)
      Yamashiro, H., Abe, Y., Kuwahara, Y., Urushihara, Y., Suzuk, M., Inoue, K., Takahash, S., Kino, Y., Fukuda, T., Isogai, E., Fukumoto, M.
    • Organizer
      CABX Workshop and international Symposium
    • Place of Presentation
      (Jeiu,Korea)
    • Related Report
      2013 Final Research Report
  • [Presentation] 福島第一原発20km圏内の雌ウシにおける卵巣の正常性2013

    • Author(s)
      阿部靖之,山城秀昭,福田智一,木野康志,関根勉,桑原義和,福本基,小林仁,阿部宏之,磯貝恵美子,福本学
    • Organizer
      第56回日本放射線影響学会
    • Place of Presentation
      (青森)(日講演要旨集p37)
    • Related Report
      2013 Final Research Report
  • [Presentation] ウシGV期卵母細胞のガラス化保存における卵丘細胞除去および細胞骨格安定剤Taxolの影響2013

    • Author(s)
      佐藤隆司,菊池英里子,金明奎,荒木至,阿部宏之,阿部靖之
    • Organizer
      第106回日本繁殖生物学会
    • Place of Presentation
      (東京)(講演要旨集p22)
    • Related Report
      2013 Final Research Report
  • [Presentation] ウシ精子における受精能と運動パラメーターの相関性2013

    • Author(s)
      荒木至,柏渕将輝,小圷泰輝,佐藤隆司,阿部宏之,阿部靖之
    • Organizer
      第117回日本畜産学会
    • Place of Presentation
      (新潟)(講演要旨集p11)
    • Related Report
      2013 Final Research Report
  • [Presentation] 福島第一原発20km圏内に生息する雌ウシの生殖器に対する放射性物質の影響解析2013

    • Author(s)
      阿部靖之,山城秀昭,及川俊徳,福田智一,木野康志,関根勉,桑原義和,福本基,小林仁,阿部宏之,沼邊孝,磯貝恵美子,福本学
    • Organizer
      第54回日本哺乳動物卵子学会
    • Place of Presentation
      (東京)(講演要旨集p13)
    • Related Report
      2013 Final Research Report
  • [Presentation] 福島第一原発20km圏内の雌ウシにおける卵巣の正常性2013

    • Author(s)
      阿部靖之,山城秀昭,福田智一,木野康志,関根勉,桑原義和,福本基,小林仁,阿部宏之,磯貝恵美子,福本学.
    • Organizer
      第56回日本放射線影響学会
    • Place of Presentation
      ホテルクラウンパレス青森
    • Related Report
      2013 Annual Research Report
  • [Presentation] ウシGV期卵母細胞のガラス化保存における卵丘細胞除去および細胞骨格安定剤Taxolの影響2013

    • Author(s)
      佐藤隆司,菊池英里子,金明奎,荒木至,阿部宏之,阿部靖之
    • Organizer
      第106回日本繁殖生物学会
    • Place of Presentation
      東京 農工大学農学部府中キャンパス
    • Related Report
      2013 Annual Research Report
  • [Presentation] ウシ精子における受精能と運動パラメーターの相関性2013

    • Author(s)
      荒木至,柏渕将輝,小圷泰輝,佐藤隆司,阿部宏之,阿部靖之
    • Organizer
      第117回日本畜産学会
    • Place of Presentation
      新潟大学農学部
    • Related Report
      2013 Annual Research Report
  • [Presentation] 福島第一原発20km圏内に生息する雌ウシの生殖器に対する放射性物質の影響解析2013

    • Author(s)
      阿部靖之,山城秀昭,及川俊徳,福田智一,木野康志,関根 勉,桑原義和,福本 基,小林 仁,阿部宏之,沼邊 孝,磯貝恵美子,福本 学
    • Organizer
      第54回日本哺乳動物卵子学会
    • Place of Presentation
      学術総合センター
    • Related Report
      2013 Annual Research Report
  • [Presentation] 発生工学技術を用いた動物生産2012

    • Author(s)
      阿部靖之
    • Organizer
      山形化学工学談話会
    • Place of Presentation
      (米沢)
    • Year and Date
      2012-02-17
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] 福島第一原発由来の放射性物質がウシの雌生殖器に及ぼす影響の解析2012

    • Author(s)
      阿部靖之,山城秀昭,木野康志,福田智一,阿部宏之,小林仁,磯貝恵美子,福本学
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      (仙台)(講演要旨集p47)
    • Related Report
      2013 Final Research Report
  • [Presentation] Effect of vitrification at GV stage on the mitochondrial and cytoskeletal integrity in bovine oocytes2012

    • Author(s)
      Abe, Y., Takakura, K., Kaito, K., Ogawa, T., Yokoo, M., Abe, H.
    • Organizer
      38th Annual Conference of the IETS
    • Place of Presentation
      (Phoenix, USA)
    • Related Report
      2013 Final Research Report
  • [Presentation] 電子線マイクロアナライザによる被災牛の精巣切片の元素分析2012

    • Author(s)
      山城秀昭, 阿部靖之, 福田智一,木野康志,福本 基, 桑原義和, 高橋 慎太郎,植松恵美, 小林 仁,磯貝恵美子,福本 学
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      東北大学 川内北キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 福島第一原発由来の放射性物質がウシの雌生殖器に及ぼす影響の解析2012

    • Author(s)
      阿部靖之,山城秀昭,木野康志,福田智一,阿部宏之,小林 仁,磯貝恵美子,福本 学
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      東北大学 川内北キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 食肉用家畜の放射性セシウムと畜前推定技術の開発-血液からの推定2012

    • Author(s)
      磯貝恵美子,福田智一,木野康志,福本 学,篠田 壽,関根 勉,小幡裕一,山城秀昭,阿部靖之
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      東北大学 川内北キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 警戒区域内被災動物および周辺環境の放射能測定:Ag-110mの分布について2012

    • Author(s)
      木野康志,入澤 歩,二瓶英和,佐野陽祐,関根 勉,福田智一,磯貝恵美子,福本 学,阿部靖之,山城秀昭
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      東北大学 川内北キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 被災家畜における体内の放射性物質の分布について.第55回日本放射線影響学会2012

    • Author(s)
      福田智一,木野康志,阿部靖之,山城秀昭,桑原義和,志村 勉,福本 基,篠田 壽,関根 勉,磯貝恵美子,福本 学
    • Organizer
      第55回日本放射線影響学会
    • Place of Presentation
      東北大学 川内北キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 福島第一原子力発電所事故に伴う家畜の内部被ばく2012

    • Author(s)
      磯貝恵美子,福田智一,木野康志,福本 学,篠田 壽,関根 勉,山城秀昭,黒田健吾,米山 裕,阿部靖之
    • Organizer
      第43回日本家畜臨床学会
    • Place of Presentation
      ホテル松島 大観荘
    • Related Report
      2012 Research-status Report
  • [Presentation] 放射性セシウムが警戒区域内のイノブタおよびブタの消化管および雄生殖細胞に及ぼす影響2012

    • Author(s)
      小林 仁,伊藤寬基,森本素子,井上達志,木野康志,山城秀昭,阿部靖之,篠田壽,関根勉,福本学,福田智一,磯貝恵美子
    • Organizer
      第116回日本畜産学会
    • Place of Presentation
      安田女子大学
    • Related Report
      2012 Research-status Report
  • [Presentation] 発生工学技術を用いた動物生産2012

    • Author(s)
      阿部靖之
    • Organizer
      山形化学工学懇話会(招待講演)(招待講演)
    • Place of Presentation
      山形大学工学部(山形県)
    • Related Report
      2011 Research-status Report
  • [Presentation] Effect of vitrification at GV stage on the mitochondrial and cytoskeletal integrity in bovine oocytes2012

    • Author(s)
      Yasuyuki Abe, Kei Takakura, Kohei Kaito, Taku Ogawa, Masaki Yokoo, Hiroyuki Abe
    • Organizer
      International Embryo Transfer Society
    • Place of Presentation
      Renaissance Glendale Hotel & Spa (Phoenix, USA)
    • Related Report
      2011 Research-status Report
  • [Presentation] 福島原発20km圏内の家畜における体内放射性物質の動態解析2012

    • Author(s)
      山城秀昭,阿部靖之,福田智一,木野康志,篠田 壽,関根 勉,小林仁,磯貝恵美子,福本 学
    • Organizer
      北信越畜産学会新潟県分会
    • Place of Presentation
      新潟大学農学部(新潟県)
    • Related Report
      2011 Research-status Report
  • [Presentation] 異なる温度条件下で保存したウシ卵巣における組織学的変化2012

    • Author(s)
      萩本範幸,黒谷玲子,阿部靖之,阿部宏之
    • Organizer
      東日本家畜受精卵移植技術研究会
    • Place of Presentation
      ひだホテルプラザ(岐阜県)
    • Related Report
      2011 Research-status Report
  • [Presentation] Studies on the cryopreservation and in vitro culture of eggsin mammalians2011

    • Author(s)
      Abe, Y.
    • Organizer
      International Workshop on Polymer Rheology for East Asian Young Scientists
    • Place of Presentation
      (Yamagata, Japan)
    • Year and Date
      2011-09-01
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Studies on the cryopreservation and in vitro culture of eggs in mammalians2011

    • Author(s)
      Yasuyuki Abe
    • Organizer
      International Workshop on Polymer Rheology for East Asian Young Scientists(招待講演)
    • Place of Presentation
      Yamagata University (Yamagata)
    • Related Report
      2011 Research-status Report
  • [Presentation] ウシGV期卵子におけるガラス化保存が細胞骨格へ与える影響2011

    • Author(s)
      阿部靖之,高倉 啓,海藤康平,小川 拓,横尾正樹,阿部宏之
    • Organizer
      日本哺乳動物卵子学会
    • Place of Presentation
      国際医療福祉大学(栃木県)
    • Related Report
      2011 Research-status Report
  • [Book] 冷凍空調便覧第IV巻食品・生物編動物胚および卵子(哺乳類)2013

    • Author(s)
      阿部靖之, 他
    • Publisher
      日本冷凍空調学会
    • Related Report
      2013 Final Research Report
  • [Book] 冷凍空調便覧2013

    • Author(s)
      阿部靖之
    • Total Pages
      5
    • Publisher
      日本冷凍空調学会
    • Related Report
      2013 Annual Research Report
  • [Book] 冷凍空調便覧(第6版)2013

    • Author(s)
      阿部靖之
    • Total Pages
      5
    • Publisher
      第8章3節 動物胚および卵子
    • Related Report
      2012 Research-status Report
  • [Book] 冷凍空調便覧(第6版)2012

    • Author(s)
      阿部靖之
    • Publisher
      動物胚および卵子
    • Related Report
      2011 Research-status Report
  • [Book] スキッロ動物生殖生理学(翻訳本)2011

    • Author(s)
      阿部靖之
    • Publisher
      成熟雄における精巣機能の動態
    • Related Report
      2011 Research-status Report
  • [Remarks]

    • URL

      http://yasuyukiabe.yz.yamagata-u.ac.jp/

    • Related Report
      2013 Final Research Report

URL: 

Published: 2011-08-05   Modified: 2019-07-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi