Kito Keiji 紀藤圭治

… Alternative Names

紀藤圭治キトウケイジ

KITO Keiji 紀藤圭治

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Researcher Number	40345632
Other IDs
Affiliation (Current)	2025: 明治大学, 農学部, 専任教授
Affiliation (based on the past Project Information) *help	2022 – 2023: 明治大学, 農学部, 専任教授 2018 – 2020: 明治大学, 農学部, 専任准教授 2014: 明治大学, 農学部生命科学, 講師 2009 – 2014: 明治大学, 農学部, 講師 2012: 明治大学, 農学部, 専任講師 … More 2008: The University of Tokyo, 大学院・新領域創成科学研究科, 特任助教 2007: The University of Tokyo, 大学院・新領域創成科学研究科, 研究拠点形成特任教員 2006: 東京大学, 大学院新領域創成科学研究科, 研究拠点形成特任教員 Less
Review Section/Research Field	Principal Investigator Basic Section 44010:Cell biology-related / Science and Engineering / Genome biology Except Principal Investigator Medium-sized Section 43:Biology at molecular to cellular levels, and related fields / System genome science / Genome biology / Biological Sciences
Keywords	Principal Investigator 出芽酵母 / PCS-MS法 / プロテオーム / トランスクリプトーム / 絶対定量 / GATC-PCR法 / アミノ酸再利用 / オートファジー / 不均等分配 / プロテオミクス … More / 細胞老化 / 絶対量計測 / 質量分析 / 酵母 / 代謝経路 / 比較プロテオミクス … More Except Principal Investigator 過剰発現 / 酵母 / 質量分析 / 毒性 / タンパク質毒性 / PolyX / 細胞の処理能力 / 増殖阻害 / タンパク質負荷 / 処理能力 / 細胞内輸送 / 細胞 / 細胞内局在 / 局在化 / プロセス負荷 / タンパク質過剰 / 質量分析計 / 脱ユビキチン化酵素 / 出芽酵母 / プロテオミクス / ユビキチン / 蛋白質間相互作用 / 定量 / 質最分析 / リン酸化 / 蛋白質問相互作用 / 代謝物 / 安定同位元素標識 / 非コードRNA / 454シークエンサ / 定量性 / プロテオーム / トランスクリプトーム / ゲノム / GIS-PET / 遺伝子発現 / FRET / ユビキチン化 / 定量プロテオミクス / 次世代シーケンサ / 転写開始点 Less

Quantitative analysis of proteome homeostasis and amino acid recycling during nutrient starvation stressPrincipal Investigator
- Principal Investigator
  
  紀藤圭治
- Project Period (FY)
  2023 – 2027
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 44010:Cell biology-related
- Research Institution
  Meiji University
連続するアミノ酸（PolyX）が生み出す細胞毒性のメカニズム
- Principal Investigator
  
  守屋央朗
- Project Period (FY)
  2022 – 2024
- Research Category
  
  Grant-in-Aid for Challenging Research (Exploratory)
- Review Section
  
  Medium-sized Section 43:Biology at molecular to cellular levels, and related fields
- Research Institution
  Okayama University
Comprehensive analysis of asymmetric inheritance of older proteins to understand the role in cellular agingPrincipal Investigator
- Principal Investigator
  
  Kito Keiji
- Project Period (FY)
  2018 – 2020
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 44010:Cell biology-related
- Research Institution
  Meiji University
Cell processing capacity explored by expression limits of proteins
- Principal Investigator
  
  Moriya Hisao
- Project Period (FY)
  2018 – 2020
- Research Category
  
  Grant-in-Aid for Challenging Research (Exploratory)
- Review Section
  
  Medium-sized Section 43:Biology at molecular to cellular levels, and related fields
- Research Institution
  Okayama University
Analysis of the mechanisms of process burdens in yeast
- Principal Investigator
  
  HISAO Moriya
- Project Period (FY)
  2013 – 2014
- Research Category
  
  Grant-in-Aid for Challenging Exploratory Research
- Research Field
  
  System genome science
- Research Institution
  Okayama University
Systematic identification and classification of polyubiquitinated proteins with specific chain linkage patterns.
- Principal Investigator
  
  OTA kazuhisa
- Project Period (FY)
  2011 – 2014
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Genome biology
- Research Institution
  Nagasaki International University
  The University of Tokyo
Analysis of regulation mechanism for metabolic pathway based on comparative proteomics for protein abundancePrincipal Investigator
- Principal Investigator
  
  KITO Keiji
- Project Period (FY)
  2010 – 2012
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Genome biology
- Research Institution
  Meiji University
全mRNAおよびタンパク質の絶対量計測のための基盤技術開発Principal Investigator
- Principal Investigator
  
  紀藤圭治
- Project Period (FY)
  2007 – 2008
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Review Section
  
  Science and Engineering
- Research Institution
  The University of Tokyo
全mRNAカウンティングの基盤技術開発Principal Investigator
- Principal Investigator
  
  紀藤圭治
- Project Period (FY)
  2006
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Review Section
  
  Science and Engineering
- Research Institution
  The University of Tokyo
Development of methods for quantitative description and perturbation of biomolecular pathways and networks
- Principal Investigator
  
  ITO Takashi
- Project Period (FY)
  2005 – 2009
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Review Section
  
  Biological Sciences
- Research Institution
  The University of Tokyo

All 2023 2020 2019 2018 2012 2010 2009 2008 2007

All Journal Article Presentation Book

[Book] 明日を拓く新次元プロテオミクス(松本雅記、中山敬一:編)2009
- Author(s)
  紀藤圭治、伊藤隆司
- Total Pages
  144
- Publisher
  学研メディカル秀潤社
- Data Source
  KAKENHI-PROJECT-17017004
[Book] Introduction to Systems Biology, Chapter 9 : Methods for Protein-Protein Interaction Analysis2007
- Author(s)
  Kito, K. & Ito, T.
- Publisher
  Humana Press
- Data Source
  KAKENHI-PROJECT-17017004
[Book] Methods for protein-protein interaction analysis, Introduction to Systems Biology(Ed.Choi, S.)2007
- Author(s)
  Kito, K., Ito, T.
- Publisher
  Humana Press
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Overexpression profiling reveals cellular requirements in the context of genetic backgrounds and environments2023
- Author(s)
  Saeki Nozomu、Yamamoto Chie、Eguchi Yuichi、Sekito Takayuki、Shigenobu Shuji、Yoshimura Mami、Yashiroda Yoko、Boone Charles、Moriya Hisao
- Journal Title
  
  PLOS Genetics
  
  Volume: 19 Issue: 4 Pages: e1010732-e1010732
- DOI
  10.1371/journal.pgen.1010732
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21J12451, KAKENHI-PROJECT-22K19294, KAKENHI-PROJECT-21K05507, KAKENHI-PLANNED-23H04882, KAKENHI-PROJECT-20H03242, KAKENHI-PROJECT-23K23491
[Journal Article] Functional shell matrix proteins tentatively identified by asymmetric snail shell morphology.2020
- Author(s)
  Ishikawa, A., Shimizu, K., Isowa, Y., Takeuchi, T., Zhao, R., Kito, K., Fujie, M., Satoh, N. and Endo, K.
- Journal Title
  
  Scientific Reports
  
  Volume: 10 Issue: 1 Pages: 9768-9768
- DOI
  10.1038/s41598-020-66021-w
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01323, KAKENHI-PROJECT-18K06228
[Journal Article] Genetic profiling of protein burden and nuclear export overload.2020
- Author(s)
  Kintaka R, Makanae K, Namba S, Kato H, Kito K, Ohnuki S, Ohya Y, Andrews BJ, Boone C, Moriya H.
- Journal Title
  
  Elife
  
  Volume: 9
- DOI
  10.7554/elife.54080
- NAID
  120006941058
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PLANNED-17H06411, KAKENHI-PUBLICLY-20H04870, KAKENHI-PROJECT-18K06228, KAKENHI-PROJECT-18K19300, KAKENHI-PROJECT-19H03205
[Journal Article] Insights into the evolution of shells and love darts of land snails revealed from their matrix proteins.2019
- Author(s)
  Shimizu, K., Kimura, K., Isowa, Y., Oshima, K., Ishikawa, M., Kagi, H., Kito, K., Hattori, M., Chiba, S., Endo, K.
- Journal Title
  
  Genome Biol. Evol.
  
  Volume: 11 Issue: 2 Pages: 380-397
- DOI
  10.1093/gbe/evy242
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K06228, KAKENHI-PROJECT-16H04961, KAKENHI-PROJECT-18H01323
[Journal Article] Identification of TGFβ-induced proteins in non-endocrine mouse pituitary cell line TtT/GF by SILAC-assisted quantitative mass spectrometry2019
- Author(s)
  Tsukada Takehiro、Isowa Yukinobu、Kito Keiji、Yoshida Saishu、Toneri Seina、Horiguchi Kotaro、Fujiwara Ken、Yashiro Takashi、Kato Takako、Kato Yukio
- Journal Title
  
  Cell and Tissue Research
  
  Volume: 376 Issue: 2 Pages: 281-293
- DOI
  10.1007/s00441-018-02989-2
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17K08517, KAKENHI-PROJECT-16K18818, KAKENHI-PROJECT-18K06228
[Journal Article] Estimating the Protein Burden Limit of Yeast Cells by Measuring Expression Limits of Glycolytic Proteins.2018
- Author(s)
  Eguchi, Y., Makanae, K., Hasunuma, T., Ishibashi, Y., Kito, K., Moriya, H.
- Journal Title
  
  Elife
  
  Volume: 7
- DOI
  10.7554/elife.34595
- NAID
  120006501235
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K06228, KAKENHI-PROJECT-18K19300, KAKENHI-PROJECT-17H03618, KAKENHI-PROJECT-15KK0258, KAKENHI-PUBLICLY-18H04824
[Journal Article] Remodeling of the SCF complex-mediated ubiquitination system by compositional alteration of incorporated F-box proteins2010
- Author(s)
  Kato, M., Kito, K., Ota, K., Ito, T.
- Journal Title
  
  Proteomics 10
  
  Pages: 115-123
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Remodeling of the SCF complex-mediated ubiquitination system by compositiona lalteration of incor-porated F-box proteins.2010
- Author(s)
  Kato,M.,Kito,K.,Ota,K.,Ito,T.
- Journal Title
  
  Proteomics
  
  Volume: 10 Pages: 115-123
- Data Source
  KAKENHI-PROJECT-22510207
[Journal Article] Mass spectrometry-based approaches toward absolute quantitative proteomics2008
- Author(s)
  Kito, K., Ito, T.
- Journal Title
  
  Curr. Genomics 9
  
  Pages: 263-274
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Discrimination between stable and dynamic components of protein complexes by means of quantitative proteomics2008
- Author(s)
  Kito, K., Kawaguchi, N., Okada, S., Ito, T.
- Journal Title
  
  Proteomics 8
  
  Pages: 2366-2370
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Absolute quantification of the budding yeast transcriptome by means of competitive PCR between genomic and complementary DNAs2008
- Author(s)
  Miura, F., Kawaguchi, N., Yoshida, M., Uematsu, C., Kito, K., Sakaki, Y., Ito, T.
- Journal Title
  
  BMC Genomics 9
  
  Pages: 574-574
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] A parallel affinity purification method for selective isolation of polyubiquitinated proteins2008
- Author(s)
  Ota, K., Kito, K., Iemura, S., Natsume, T., Ito, T.
- Journal Title
  
  Proteomics 8
  
  Pages: 3004-3007
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] A parallel affinity purification method for selective isolation of polyubiquitinated proteins2008
- Author(s)
  Ota, K., Kito, K., Iemura, S., Natsume, T, Ito, T.
- Journal Title
  
  Proteomics 8
  
  Pages: 3004-3007
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] A proteomic screen reveals the mitochondrial outer membrane protein Mdm34p as an essential target of the F-box protein Mdm30p2008
- Author(s)
  Ota, K., Kito, K., Okada, S., Ito, T.
- Journal Title
  
  Genes Cells 13
  
  Pages: 1075-1085
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Mass spectrometry-based approaches toward absolute quantitative proteomics2008
- Author(s)
  Kito, K., Ito, T.
- Journal Title
  
  Curr.Genomics 9
  
  Pages: 263-274
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Absolute quantification of budding yeast transcriptome by means of competitive PCR between genomic and complementary DNAs2008
- Author(s)
  Miura, F., Kawaguchi, N., Yoshida, M., Uematsu, C., Kito, K., Sakaki, Y., Ito, T.
- Journal Title
  
  BMC Genomics 9
  
  Pages: 574-574
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] A synthetic protein approach toward accurate mass spectrometric quantification of component stoichiometry of multiprotein complexes.2007
- Author(s)
  Kito, K., Ota, K., Fujita, T., Ito, T.
- Journal Title
  
  J. Proteome Res. 6
  
  Pages: 792-800
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] Discrimination between stable and dynamic components of protein complexes by means of quantitative proteomics2007
- Author(s)
  Kito, K., Kawaguchi, N., Okada, S., & Ito, T.
- Journal Title
  
  Proteomics 8(12)
  
  Pages: 2366-2370
- Data Source
  KAKENHI-PROJECT-17017004
[Journal Article] A synthetic protein approach toward accurate mass spectrometric quantification of component stoichiometry of multiprotein complexes2007
- Author(s)
  Kito, K., Ota, K., Fujita, T., Ito, T.
- Journal Title
  
  J.Proteome Res. 6
  
  Pages: 792-800
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17017004
[Presentation] ペプチドタグ導入酵母を用いたプロテオーム高感度解析に向けたアプローチ2019
- Author(s)
  紀藤圭治
- Organizer
  酵母遺伝学フォーラム第52回研究報告会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 高感度・網羅的同定のためのペプチドタグ導入酵母の作製2019
- Author(s)
  佐竹航平、三宅賢治、紀藤圭治
- Organizer
  日本プロテオーム学会2019年大会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 出芽酵母のプロテオーム最適化に向けた多重遺伝子欠損株の解析2019
- Author(s)
  田口広和、紀藤圭治
- Organizer
  第42回日本分子生物学会年会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] プロテオームバランスの比較とその数値化2019
- Author(s)
  紀藤圭治
- Organizer
  第42回日本分子生物学会年会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 代謝嗜好性やゲノム構造の異なる多様な酵母種間の比較プロテオーム解析2019
- Author(s)
  紀藤圭治
- Organizer
  日本プロテオーム学会2019年大会
- Invited
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 内部標準による高精度・高感度定量解析に向けたアプローチ2019
- Author(s)
  三宅賢治、佐竹航平、紀藤圭治
- Organizer
  日本プロテオーム学会2019年大会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 出芽酵母におけるプロテオームバランスの改変とその細胞増殖能への影響2019
- Author(s)
  田口広和、紀藤圭治
- Organizer
  日本プロテオーム学会2019年大会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] The use of unique peptide-tags for sensitive detection of yeast proteome2019
- Author(s)
  Keiji Kito
- Organizer
  18th Human Proteome Organization World Congress
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 様々な技術融合によるプロテオームの量的および質的解析手法2018
- Author(s)
  紀藤圭治
- Organizer
  日本プロテオーム学会2018年大会
- Invited
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] A genetic approach toward mass spectrometry-based comprehensive and sensitive quantification of yeast proteome.2018
- Author(s)
  Keiji Kito
- Organizer
  17th Human Proteome Organization World Congress
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] タグペプチドを用いたプロテオーム解析最適化酵母の作製2018
- Author(s)
  紀藤圭治
- Organizer
  酵母遺伝学フォーラム第51回研究報告会
- Data Source
  KAKENHI-PROJECT-18K06228
[Presentation] 酵母種間における比較プロテオミクス2012
- Author(s)
  紀藤圭治
- Organizer
  日本プロテオーム学会
- Place of Presentation
  日本科学未来館
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] 酵母種間における代謝経路の比較プロテオミクス2012
- Author(s)
  紀藤圭治
- Organizer
  日本分子生物学会
- Place of Presentation
  福岡国際会議場・マリンメッセ福岡
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] 酵母種間における比較プロテオミクス2012
- Author(s)
  大西美帆子、伊藤遼、長谷川勇輔、正岡昌一郎、紀藤圭治
- Organizer
  日本プロテオーム学会2012年大会
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] 酵母種間における代謝経路の比較プロテオミクス2012
- Author(s)
  大西美帆子、伊藤遼、長谷川勇輔、鈴木一司、野原健弘、紀藤圭治
- Organizer
  第35回日本分子生物学会年会
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] Hierarchical Use of Peptide-concatenated Standard (PCS) for Absolute Protein Quantification with Mass Spectrometry.2010
- Author(s)
  Keiji Kito, Takashi Ito
- Organizer
  Human Proteome World Congress
- Place of Presentation
  Sydney Convention and Exhibition Centre, NSW, Australia
- Year and Date
  2010-11-21
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] Hierarchical Use of Peptide-concatenated Standard (PCS) for Absolute Protein Quantification with Mass Spectrometry.2010
- Author(s)
  Keiji Kito, Takashi Ito.
- Organizer
  September 2010.In Human Proteome World Congress
- Place of Presentation
  Sydney
- Year and Date
  2010-09-21
- Data Source
  KAKENHI-PROJECT-22510207
[Presentation] ペプチド連結型標準物質と質量分析(PCS-MS法)を用いたタンパク質の絶対量計測技術の開発2009
- Author(s)
  紀藤圭治、伊藤隆司
- Organizer
  日本ヒトプロテオーム機構第7回大会
- Place of Presentation
  東京、北里大学薬学部
- Data Source
  KAKENHI-PROJECT-17017004
[Presentation] ペプチド連結型標準物質と質量分析(PCS-MS法)を用いたタンパク質の絶対定量解析2008
- Author(s)
  紀藤圭治、他
- Organizer
  第31回日本分子生物学会年会
- Place of Presentation
  神戸ポートアイランド
- Year and Date
  2008-12-12
- Data Source
  KAKENHI-PROJECT-19021013
[Presentation] プチド連結型標準物質と質量分析(PCS-MS法)を用いたタンパク質の化学量論的定量解析2007
- Author(s)
  紀藤圭治
- Organizer
  第30回日本分子生物学会
- Place of Presentation
  パシフィコ横浜
- Data Source
  KAKENHI-PROJECT-19021013

1. HISAO Moriya (60500808)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
2. ITO Takashi (90201326)

# of Collaborated Projects: 1 results

# of Collaborated Products: 16 results
3. SUMIMOTO Hideki (30179303)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
4. OTA kazuhisa (00322727)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
5. 牧野能士 (20443442)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
6. 屋代隆

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
7. 藤原研

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
8. 遠藤一佳

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
9. BOONE CHARLES

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Kito Keiji 紀藤 圭治

紀藤 圭治 キトウ ケイジ

KITO Keiji 紀藤 圭治

Research Projects

Research Products

Co-Researchers

Quantitative analysis of proteome homeostasis and amino acid recycling during nutrient starvation stressPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

連続するアミノ酸（PolyX）が生み出す細胞毒性のメカニズム

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Comprehensive analysis of asymmetric inheritance of older proteins to understand the role in cellular agingPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Cell processing capacity explored by expression limits of proteins

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Analysis of the mechanisms of process burdens in yeast

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Systematic identification and classification of polyubiquitinated proteins with specific chain linkage patterns.

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Analysis of regulation mechanism for metabolic pathway based on comparative proteomics for protein abundancePrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

全mRNAおよびタンパク質の絶対量計測のための基盤技術開発Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

全mRNAカウンティングの基盤技術開発Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Development of methods for quantitative description and perturbation of biomolecular pathways and networks

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

[Book] 明日を拓く新次元プロテオミクス(松本雅記、中山敬一:編)2009

Author(s)

Total Pages

Publisher

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[Book] Introduction to Systems Biology, Chapter 9 : Methods for Protein-Protein Interaction Analysis2007

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[Book] Methods for protein-protein interaction analysis, Introduction to Systems Biology(Ed.Choi, S.)2007

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[Journal Article] Overexpression profiling reveals cellular requirements in the context of genetic backgrounds and environments2023

Kito Keiji 紀藤圭治

紀藤圭治キトウケイジ

KITO Keiji 紀藤圭治