野口 幸希 ( ノグチ サキ )

Noguchi, Saki

写真a

所属(所属キャンパス)

薬学部 薬学科 薬剤学講座 ( 芝共立 )

職名

助教

外部リンク

学歴 【 表示 / 非表示

  • 2006年04月
    -
    2012年03月

    慶應義塾大学, 薬学部, 薬学科

  • 2013年04月
    -
    2017年03月

    慶應義塾大学, 薬学研究科, 薬学専攻

学位 【 表示 / 非表示

  • 博士(薬学), 慶應義塾大学大学院, 課程, 2017年03月

免許・資格 【 表示 / 非表示

  • 薬剤師, 2012年04月

 

研究分野 【 表示 / 非表示

  • ライフサイエンス / 医療薬学 (薬剤学、薬物動態学)

 

論文 【 表示 / 非表示

  • Rat-Specific Expression of Placental MATE1 Contributes to Species Difference in Fetal Transfer of Metformin and 1-Methyl-4-Phenylpyridinium

    Suzuki A., Noguchi S., Tsuchitani T., Sakamoto R., Yamauchi A., Ishinabe T., Hashimoto R., Nakaguchi Y., Sakai M., Imayoshi N., Ishimoto T., Kato Y., Shirasaka Y., Katakura S., Maruyama T., Nishimura T., Tomi M.

    Molecular Pharmaceutics 22 ( 12 ) 7412 - 7422 2025年12月

    研究論文(学術雑誌), 共著, 査読有り,  ISSN  15438384

     概要を見る

    Metformin readily crosses the human placenta. However, the fetal-to-maternal plasma concentration ratio (F/M ratio) of metformin has been reported to be as low as 0.057 in rats. This study investigated the underlying mechanisms of these interspecies differences by examining the expression and function of candidate transporters, organic cation transporter 3 (OCT3/SLC22A3) and multidrug and toxin extrusion protein 1 (MATE1/SLC47A1), in the placenta across species. Expression analysis at gene and protein levels using RNA-sequencing and absolute quantification by LC-MS/MS revealed minimal species differences in placental OCT3 expression (less than 4-fold). In contrast, MATE1 showed almost exclusive expression in the rat placental labyrinth, but minimal or undetectable levels were observed in samples prepared from human placental villi and mouse placental labyrinth. To evaluate the function of the placental MATE1, we compared the placental transfer of two dual substrates of MATE1 and OCT3, metformin and 1-methyl-4-phenylpyridinium (MPP<sup>+</sup>), in pregnant rats and mice in the presence and absence of pyrimethamine, a MATE1 inhibitor. The pyrimethamine was dosed to reach the plasma concentration, which specifically inhibits MATE1 based on the measured IC<inf>50</inf> of pyrimethamine to rat MATE1 and OCT3, which were 0.015 and 100 μM, respectively. The F/M ratios of metformin and MPP<sup>+</sup> in the absence of pyrimethamine were half or less in rats compared to mice. Notably, preadministration of pyrimethamine increased the F/M ratios of metformin and MPP<sup>+</sup> by approximately 50% in rats but not mice. These findings demonstrate that functional placental MATE1 expression is specific to rats, which, in part, contributes to the low fetal transfer of cationic compounds compared with other species. This is of significant concern, as it suggests that nonclinical developmental and reproductive toxicity studies of MATE1 substrate drugs in rats may underestimate fetal exposure and toxicity when extrapolated to humans.

  • Fetal ezrin expression affects macrophages and regulatory T cells in mouse placental decidua

    Nishimura T., Mizokami R., Yamanaka M., Takahashi M., Yoshida Y., Ogawa Y., Noguchi S., Tomi M.

    Biochemical and Biophysical Research Communications 735 2024年11月

    研究論文(学術雑誌), 共著, 査読有り,  ISSN  0006291X

     概要を見る

    Ezrin is a cross-linker protein between membrane proteins and cytosolic actin, abundantly expressed in the placenta among the ERM protein family. Ezrin gene knockout mice exhibit fetal growth restriction after gestational day (GD) 15.5. This study aimed to clarify the effect of ezrin on immune cells that influence fetal growth and immune tolerance. Ezrin heterozygous knockout (Ez+/−) mice were interbred, and the gene expressions and immune cell distributions in the placentas of wild-type (Ez+/+) and ezrin knockout (Ez−/−) fetuses were analyzed. IL-6 expression in the placenta of Ez−/− fetuses was significantly higher than in Ez+/+ fetuses at GD 15.5. The mRNA expression of IL-6 in the uterine decidua attached to Ez−/− fetuses was higher compared to that attached to Ez+/+ fetuses but not in the junctional zone and labyrinth. Classical M1 and M2 macrophages in the decidua were analyzed by flow cytometry using CD86 and CD206 as markers. M1 macrophages increased in the decidua attached to Ez−/− mice compared to Ez+/+ mice, while M2 macrophages did not increase. CD4-positive T cells showed a reduction in the decidua attached to Ez−/− fetuses. Further analysis involved the subcutaneous administration of tacrolimus in pregnant Ez+/− mice from GD 8.5 to GD 15.5, which prevented the decrease in fetal body weight and decidual CD4-positive T cells in Ez−/− mice at GD 15.5. These results suggest that impaired expression of fetoplacental-derived ezrin induces inflammatory conditions in the uterine decidua through M1 polarization of macrophages, increased IL-6, and decreased CD4-positive T cells, including Treg cells.

  • Conversion of Olmesartan to Olmesartan Medoxomil, A Prodrug that Improves Intestinal Absorption, Confers Substrate Recognition by OATP2B1

    Fukazawa N., Nishimura T., Orii K., Noguchi S., Tomi M.

    Pharmaceutical Research 41 ( 5 ) 849 - 861 2024年05月

    研究論文(学術雑誌), 査読有り,  ISSN  07248741

     概要を見る

    Purpose: Olmesartan medoxomil (olmesartan-MX), an ester-type prodrug of the angiotensin II receptor blocker (ARB) olmesartan, is predominantly anionic at intestinal pH. Human organic anion transporting polypeptide 2B1 (OATP2B1) is expressed in the small intestine and is involved in the absorption of various acidic drugs. This study was designed to test the hypothesis that OATP2B1-mediated uptake contributes to the enhanced intestinal absorption of olmesartan-MX, even though olmesartan itself is not a substrate of OATP2B1. Methods: Tetracycline-inducible human OATP2B1- and rat Oatp2b1-overexpressing HEK 293 cell lines (hOATP2B1/T-REx-293 and rOatp2b1/T-REx-293, respectively) were established to characterize OATP2B1-mediated uptake. Rat jejunal permeability was measured using Ussing chambers. ARBs were quantified by liquid chromatography-tandem mass spectrometry. Results: Significant olmesartan-MX uptake was observed in hOATP2B1/T-REx-293 and rOatp2b1/T-REx-293 cells, whereas olmesartan uptake was undetectable or much lower than olmesartan-MX uptake, respectively. Furthermore, olmesartan-MX exhibited several-fold higher uptake in Caco-2 cells and greater permeability in rat jejunum compared to olmesartan. Olmesartan-MX uptake in hOATP2B1/T-REx-293 cells and in Caco-2 cells was significantly decreased by OATP2B1 substrates/inhibitors such as 1 mM estrone-3-sulfate, 100 µM rifamycin SV, and 100 µM fluvastatin. Rat Oatp2b1-mediated uptake and rat jejunal permeability of olmesartan-MX were significantly decreased by 50 µM naringin, an OATP2B1 inhibitor. Oral administration of olmesartan-MX with 50 µM naringin to rats significantly reduced the area under the plasma concentration–time curve of olmesartan to 76.9%. Conclusion: Olmesartan-MX is a substrate for OATP2B1, and the naringin-sensitive transport system contributes to the improved intestinal absorption of olmesartan-MX compared with its parent drug, olmesartan.

  • Involvement of GAT2/Slc6a13 in hypotaurine uptake at fetal-facing plasma membrane of syncytiotrophoblasts at mid-to-late gestation in rats and mice

    Nishimura T., Araki H., Higuchi K., Noguchi S., Saito K., Hara K., Yagishita H., Akashi R., Obata S., Tomi M.

    Placenta 147   59 - 67 2024年03月

    研究論文(学術雑誌), 査読有り,  ISSN  01434004

     概要を見る

    Introduction: Hypotaurine, a precursor to taurine, is known for its antioxidant properties and is prominently present in fetal plasma and the placenta. Our previous research revealed that ezrin-knockout mice experience fetal growth retardation, coinciding with reduced hypotaurine levels in fetal plasma. This study aims to elucidate the expression and role of hypotaurine transporters within the placenta. Methods: We employed quantitative RT-PCR to measure mRNA expression of GAT transporter family members in the placenta during mid-to-late gestation. LC/MS/MS was used to analyze the distribution of hypotaurine in different placental subregions. Immunohistochemistry was utilized to examine the localization of GAT2 in mice. Placental hypotaurine uptake from fetal circulation was studied via umbilical perfusion in rats. Results: Among hypotaurine transporters, GAT2 exhibited increased mRNA and protein expression in murine placenta during mid-to-late gestation. Notably, GAT2/Slc6a13 mRNA and hypotaurine were most concentrated in the labyrinth of murine placenta. In contrast, enzymes responsible for hypotaurine synthesis, such as cysteine dioxygenase, cysteine sulfinic acid decarboxylase, and 2-aminoethanethiol dioxygenase, showed minimal expression in the labyrinth. These findings suggest that GAT2 is a key determinant of hypotaurine levels in the placental labyrinth. Immunohistochemical examination unveiled that GAT2 was predominantly localized on the fetal-facing plasma membrane within syncytiotrophoblasts, which co-localized with ezrin. In rat umbilical perfusion experiments, the GAT2/3 and TauT inhibitor, SNAP-5114, significantly reduced hypotaurine extraction from fetal circulation to the placenta. Discussion: The results suggest that GAT2 plays a pivotal role in the concentrative uptake of hypotaurine from fetal plasma within syncytiotrophoblasts of the placenta.

  • Breast Cancer Resistance Protein Limits Fetal Transfer of Tadalafil in Mice

    Nishimura T., Ishii M., Tanaka H., Noguchi S., Ikeda T., Tomi M.

    Journal of Pharmaceutical Sciences (Journal of Pharmaceutical Sciences)  113 ( 2 ) 486 - 492 2023年11月

    研究論文(学術雑誌), 査読有り,  ISSN  00223549

     概要を見る

    Tadalafil, a phosphodiesterase 5 (PDE5) inhibitor, is a candidate therapeutic agent for fetal growth restriction and hypertensive disorders of pregnancy. In this study, we elucidated the fetal transfer of tadalafil in comparison with that of sildenafil, the first PDE5 inhibitor to be approved. We also examined the contributions of multidrug resistance protein 1 (MDR1) and breast cancer resistance protein (BCRP) to fetal transfer. Tadalafil or sildenafil was administered to wild-type, Mdr1a/b-double-knockout or Bcrp-knockout pregnant mice by continuous infusion from gestational day (GD) 14.5 to 17.5, and the fetal-to-maternal plasma concentration ratio of unbound drug (unbound F/M ratio) was evaluated at GD 17.5. The values of unbound F/M ratio of tadalafil and sildenafil in wild-type mice were 0.80 and 1.6, respectively. The unbound F/M ratio of tadalafil was increased to 1.1 and 1.7 in Mdr1a/b-knockout and Bcrp-knockout mice, respectively, while the corresponding values for sildenafil were equal to or less than that in wild-type mice, respectively. A transcellular transport study revealed that basal-to-apical transport of both tadalafil and sildenafil was significantly higher than transport in the opposite direction in MDCKII-BCRP cells. Our research reveals that tadalafil is a newly identified substrate of human and mouse BCRP, and it appears that the fetal transfer of tadalafil is, at least in part, attributed to the involvement of BCRP within the placental processes in mice. The transfer of sildenafil to the fetus was not significantly constrained by BCRP, even though sildenafil was indeed a substantial substrate for BCRP.

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総説・解説等 【 表示 / 非表示

  • タダラフィルのマウス胎仔移行におけるBCRPの関与

    西村 友宏, 石井 まり, 野口 幸希, 田中 博明, 池田 智明, 登美 斉俊

    日本薬学会年会要旨集 ((公社)日本薬学会)  142年会   26C - pm04 2022年03月

    ISSN  0918-9823

  • 【「今さら聞けない」をスッキリ解消する 妊娠・授乳と薬】[妊娠と薬]妊娠による生理学的変化と薬物動態

    西村 友宏, 野口 幸希

    薬事 ((株)じほう)  62 ( 4 ) 717 - 727 2020年03月

    その他, 共著,  ISSN  0016-5980

     概要を見る

    <Points>▼妊娠による生理学的変動は薬物血中濃度に影響を与えるため、投与量や投与頻度の調節が必要な場合がある。▼血漿容積の増加により血漿タンパク濃度が減少するため、血漿タンパク結合率が減少し、薬物の分布容積や消失速度の増大につながる。▼肝薬物代謝酵素の発現変動が起こるが、その変動は代謝酵素の分子種により異なる。▼糸球体濾過量の上昇により、腎排泄型薬物の消失が促進される。▼治療薬物モニタリング(TDM)対象薬物にはTDMを行うことが推奨され、また血中濃度の解釈は血漿タンパク結合率が変動していることを考慮する必要がある。(著者抄録)

  • 血液脳関門における中性アミノ酸トランスポーターLAT1を介したpregabalin輸送

    高橋優, 西村友宏, 樋口慧, 野口幸希, 手賀悠真, 黒澤俊樹, 出口芳春, 登美斉俊

    生体膜と薬物の相互作用シンポジウム講演要旨集 40th 2018年

    ISSN  0919-2131

  • ROLE OF ORGANIC ANION TRANSPORTER 4 ON THE TRANSPORT OF OLMESARTAN ACROSS THE BASAL PLASMA MEMBRANE OF HUMAN PLACENTAL SYNCYTIOTROPHOBLAST

    Masatoshi Tomi, Saki Noguchi, Ayasa Fujibayashi, Tetsuo Maruyama, Emi Nakashima, Tomohiro Nishimura

    PLACENTA 45   133 - 133 2016年09月

    ISSN  0143-4004

  • OAT4-MEDIATED TRANSPORT OF OLMESARTAN AT THE BASAL PLASMA MEMBRANE OF THE HUMAN PLACENTAL BARRIER

    Saki Noguchi, Tomohiro Nishimura, Tetsuo Maruyama, Masatoshi Tomi, Emi Nakashima

    DRUG METABOLISM REVIEWS 47   296 - 296 2015年11月

    ISSN  0360-2532

研究発表 【 表示 / 非表示

  • 胎盤MFSD2Aを介したLPC-DHAの輸送とその分子種変換を伴う胎児移行機構

    野口幸希.

    [国内会議]  日本薬学会第146年会 (大阪) , 

    2026年03月

    シンポジウム・ワークショップ パネル(公募)

  • MCT1はヒト胎盤バリアモデルにおいてプロピオン酸の双方向輸送を促進するが、MCT4は促進しない。

    山本耕平, 緑川凜, 土谷聡耀, 野口幸希, 堀武志, 梶弘和, 登美斉俊.

    [国内会議]  日本薬学会第146年会 (大阪) , 

    2026年03月

    口頭発表(一般)

  • In vivo・ex vivoにおけるIgG経胎盤透過を説明可能な生理学的薬物速度論モデルの構築

    藤﨑舞友子, 土谷聡耀, 野口幸希, 登美斉俊.

    [国内会議]  日本薬学会第146年会 (大阪) , 

    2026年03月

    ポスター発表

  • Placental MATE1 Expression in Rats Explains Species Differences in Fetal Transfer of Organic Cations

    Masatoshi Tomi, Ashukan Suzuki, Ryo Sakamoto, Ririka Hashimoto, Aoi Yamauchi, Maiko Sakai, Tomohiro Nishimura, Toshiaki Tsuchitani, Saki Noguchi.

    [国際会議]  Asian Federation for Pharmaceutical Sciences Conference 2025 (Sydney, Australia) , 

    2025年12月

    口頭発表(一般)

  • Identification of syncytiotrophoblast-specific transporter genes and their protein expression in mouse placenta

    Kurumi Inagaki, Saki Noguchi, Ryusei Takei, Takuro Ishinabe, Tomohiro Nishimura, Toshiaki Tsuchitani, Masatoshi Tomi

    [国際会議]  Asian Federation for Pharmaceutical Sciences Conference 2025 (Sydney, Australia) , 

    2025年12月

    ポスター発表

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競争的研究費の研究課題 【 表示 / 非表示

  • Ex vivo-in silicoハイブリッドによるヒト胎児薬物移行の新解析プラットフォーム構築

    2024年04月
    -
    2027年03月

    日本学術振興会, 科学研究費助成事業, 登美 斉俊, 千葉 康司, 佐村 修, 野口 幸希, 基盤研究(B), 未設定

  • 胎盤内分泌破綻の早期予測に向けた胎盤関門因子の同調制御解析

    2023年04月
    -
    2026年03月

    野口 幸希, 基盤研究(C), 補助金,  研究代表者

  • 有機酸取り込みトランスポーターを標的とした腎不全予防法の提案

    2022年08月
    -
    2024年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 野口 幸希, 研究活動スタート支援, 補助金,  研究代表者

  • 胎盤エクソソームのウイルス型膜融合を介した妊婦薬物動態の統合制御

    2020年07月
    -
    2022年03月

    日本学術振興会, 科学研究費助成事業, 登美 斉俊, 石川 源, 野口 幸希, 西村 友宏, 挑戦的研究(萌芽), 未設定

     研究概要を見る

    胎盤特異的に発現するsyncytin-2は膜融合能を持ち、合胞体化による関門形成に関与する。胎盤モデル細胞由来エクソソームの肝モデル細胞への取り込みは、細胞でのsyncytin-2発現を誘導することで上昇した。エクソソームを添加した肝モデル細胞における胎盤特異的miRNAの発現も検出され、syncytin-2発現はエクソソームによる細胞間情報伝達に寄与すると考えられた。ただし、syncytin-2受容体であるMFSD2Aのマウス肝臓での発現が絶食時のみであることも示され、関与は限定的である可能性がある。MFSD2Aは、胎児へのドコサヘキサエン酸の供給を担うことも示唆された。

  • 尿細管の両面動態にアプローチする先天性代謝疾患治療法の開拓

    2020年04月
    -
    2022年03月

    文部科学省・日本学術振興会, 科学研究費助成事業, 野口 幸希, 若手研究, 補助金,  研究代表者

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担当授業科目 【 表示 / 非表示

  • 課題研究(薬剤学)

    2025年度

  • 細胞培養・遺伝子実験特別演習

    2025年度

  • 演習(薬剤学)

    2025年度

  • 卒業研究1(薬学科)

    2025年度

  • 薬剤学実習

    2025年度

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担当経験のある授業科目 【 表示 / 非表示

  • 英語演習(薬科学科)

    慶應義塾

    2023年04月
    -
    2024年03月

  • 薬剤学実習

    慶應義塾

    2023年04月
    -
    2024年03月

  • 薬物動態学1

    慶應義塾

    2023年04月
    -
    2024年03月

  • 課題研究(薬剤学)

    慶應義塾

    2023年04月
    -
    2024年03月

  • 英語演習(薬学科)

    慶應義塾

    2023年04月
    -
    2024年03月

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