JP7389448B2 - 新規フザラミン物質を有効成分とする白血病細胞増殖抑制剤 - Google Patents
新規フザラミン物質を有効成分とする白血病細胞増殖抑制剤 Download PDFInfo
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- JP7389448B2 JP7389448B2 JP2019110891A JP2019110891A JP7389448B2 JP 7389448 B2 JP7389448 B2 JP 7389448B2 JP 2019110891 A JP2019110891 A JP 2019110891A JP 2019110891 A JP2019110891 A JP 2019110891A JP 7389448 B2 JP7389448 B2 JP 7389448B2
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Description
本発明者等によって徳島県徳島市の土壌より新たに、フザリウム・エスピー(Fusarium sp.)FKI-7550株を分離した。フザリウム・エスピー(Fusarium sp.)FKI-7550株の菌学的性状は以下の通りであった。
本菌株は、麦芽汁寒天培地、合成栄養寒天培地で良好に生育し、各種寒天培地で分生子の着生は良好であった。
合成栄養寒天培地に生育したコロニーを顕微鏡で観察すると、菌糸は無色、幅2.1-4.2(-6.2)μm、有隔壁、薄壁であった。分生子は培地上で二形性を示し、小分生子と大分生子となる。小分生子は、隔壁を有する菌糸から生じる短いフィアライド上に擬頭状をなして形成される。フィアライドの大きさは、(10.4-)18.7-37.4×2.1-3.1(-4.2)μmであった。分生子は長楕円または楕円形で0-1隔壁、大きさは6.2-12.5(-17.7)×(2.1-)4.0-4.2μmであった。大分生子は、分生子柄上に2~3分枝したフィアライド上に集塊状をなして形成される。分生子柄の大きさは0-6.2(-10.5)×2.1-4.2μmであり、フィアライドの大きさは4.2-6.2(-14.6)×2.1-3.1(-4.2)μmであった。分生子は三日月形で3-4隔壁、大きさは(31.2-)43.7-56.2(-72.8)×3.1-4.2(-6.2)μmであり、頂部は僅かにかぎ状に湾曲し、基部は踵状となり、基部の大きさは1.0-3.1×1.0-2.1μmであった。厚壁胞子は菌糸に側生、またはその分枝の先端に連鎖状に形成され、無色、粗状、亜球形ないし広楕円形、大きさは(6.2-)10.4-16.6×(10.4-)16.6-20.8μmであった。
各種寒天培地上で、25℃、7日間培養した場合の肉眼的観察結果を表1に示す。
ITS遺伝子のうち562塩基の配列を決定し、DNAデータベースに登録され公開されている糸状菌のデータを用いた相同性検索および近隣結合法による系統解析の結果、本菌株はフザリウム属に分類されるのが妥当であった。
上記FKI-7550株の形態的特徴および培養性状に基づき、既知菌種との比較を試みた結果、およびITS遺伝子の解析結果から、本菌株はフザリウム属に属する1菌種であると判断される。なお、本菌株はフザリウム・エスピー(Fusarium sp.)FKI-7550として、2019年5月9日付にて独立行政法人製品評価技術基盤機構 特許微生物寄託センターに寄託されている(NITE AP-2944)(NITE P-03741)。
スターチ2.4%、グルコース0.1%、ペプトン(極東製薬工業株式会社製)0.3%、カツオエキス(極東製薬工業株式会社製)0.3%、酵母エキス(オリエンタル酵母工業株式会社製)0.5%、炭酸水素カルシウム0.4%からなる液体培地(pH 7.0)100mLを含む500mL容三角フラスコに100本に、液体培地で培養したフザリウム・エスピー(Fusarium sp.)FKI-7550株(NITE AP-2944)(NITE P-03741)を各1mlずつ植菌し、27℃で3日間振盪培養した。得られた種培養液を、nutrient broth(Difco)3.3%、ソイビンミール(東京保存食糧(株))3.3%、グリセロール2.2%、可用性デンプン2.2%、炭酸水素カルシウム2.2%(pH7.0)100mLを含む500mL容三角フラスコに60本に、各1mLずつ植菌し、27℃で7日間振盪培養した。
(1)性状:淡黄色個体
(2)分子量:441
(3)分子式:C27H39O4N
高速原子衝突イオン化による[M+H]+ 理論値(m/z)442.2975、実測値(m/z)442.2946
(4)比旋光度:[α]D 25=-127.2(c=0.1、メタノール)
(5)紫外部吸収極大 λmax nm(メタノール中):203.0(20,100),242(8,500),281(13,100)(括弧内ε)
(6)赤外部吸収極大 vmax(ART):3332,2954,2919,1650,1596,1450,1342,1106,1041cm-1に極大吸収を有する。
(7)円偏光二色性スペクトルλmax nm(メタノール中):226(-18,412),242(-10,585),262(-9,472),285(-9,759)(括弧内Δε)
(8)プロトン核磁気共鳴スペクトル:重ジメチルスルホキシド中の化学シフト(ppm)およびスピン結合定数(Hz)を表2に示す。
(9)カーボン核磁気共鳴スペクトル:重ジメチルスルホキシド中の化学シフト(ppm)を表2に示す。
(10)溶剤に対する溶解性:メタノール、ジメチルスルホキシド、アセトン、クロロホルムに易溶。水に難溶。
細胞として、HL-60ヒト急性前骨髄性白血病由来細胞株、JurkatヒトT細胞性白血病由来細胞株、およびTHP-1ヒト急性単球性白血病由来細胞株を用いた。10%非動化牛胎児血清(FBS)および抗生物質添加RPMI-1640培地にて維持、継代培養を行った細胞を用いた。各細胞を10%FBS含有RPMI-1640培地にて3×106cell/mlになるように浮遊液を調整し、96well plateに100μlを添加し混和後、37℃、5%CO2-95%air環境下で1日間培養を行った。その後、各wellに本化合物のメタノール水溶液1μlを添加し、混和後、前述のガス環境下で2日間培養を行った。各細胞の増殖の有無はWST-8法にて比色定量した。本化合物の50%細胞増殖阻止濃度(IC50値)は化合物濃度作用曲線より求めた。結果を表3に示す。
本発明のフザラミン物質の抗菌活性を以下のとおり測定した。濾紙円板(アドバンテック社製、直径6mm)にフザラミン物質の0.3mg/mlのメタノール溶液をそれぞれ10μl浸漬し、一定時間風乾して溶媒を除去後、試験菌含菌寒天平板に張り付け、Staphylococcus aureus KB210 (ATCC6538p)、Bacillus subtilis ATCC6633、Kocuria rhizophila KB212 (ATCC9341)は37℃で、Xanthomonas oryzae pv. oryzae KB88は27℃で24時間培養後、生育阻止円を観察した。その結果を表4に示す。
Claims (7)
- 請求項1に記載のフザラミン物質を生産する能力を有する糸状菌に属する微生物を培地で培養し、培養物中にフザラミン物質を蓄積せしめ、該培養物からフザラミン物質を採取することを特徴とするフザラミン物質の製造法であって、
前記フザラミン物質を生産する能力を有する糸状菌に属する微生物が、フザリウム・エスピー(Fusarium sp.)FKI-7550である製造法。 - フザリウム・エスピー(Fusarium sp.)FKI-7550(NITE P-03741)。
- 請求項1に記載のフザラミン物質又はその水和物若しくは溶媒和物、又はそれらの塩を有効成分として含有する医薬組成物。
- 白血病細胞増殖抑制剤である、請求項4に記載の医薬組成物。
- ヒト急性前骨髄性白血病細胞、ヒトT細胞性白血病細胞、およびヒト急性単球性白血病細胞の増殖抑制剤である、請求項5に記載の医薬組成物。
- 請求項1に記載のフザラミン物質又はその水和物若しくは溶媒和物、又はそれらの塩を有効成分として含有する抗菌剤。
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Non-Patent Citations (3)
Title |
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BARNICKEL et al.,Chemistry & Biodiversity,2010年,Vol. 7, No. 12,p.2830-2845,DOI: 10.1002/cbdv.201000179 |
BROWN et al.,Fungal Genetics and Biology,2016年,Vol. 89,p.37-51,DOI:10.1016/j.fgb.2016.01.008 |
KEMAMI WANGUN et al.,Organic & Biomolecular Chemistry,2007年,Vol. 5, No. 11,p.1702,DOI:10.1039/b702378b |
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