JP6879511B2 - 血小板産生促進剤及びそれを用いた血小板の製造方法 - Google Patents
血小板産生促進剤及びそれを用いた血小板の製造方法 Download PDFInfo
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- 230000019491 signal transduction Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- HKSZLNNOFSGOKW-FYTWVXJKSA-N staurosporine Chemical compound C12=C3N4C5=CC=CC=C5C3=C3CNC(=O)C3=C2C2=CC=CC=C2N1[C@H]1C[C@@H](NC)[C@@H](OC)[C@]4(C)O1 HKSZLNNOFSGOKW-FYTWVXJKSA-N 0.000 description 1
- CGPUWJWCVCFERF-UHFFFAOYSA-N staurosporine Natural products C12=C3N4C5=CC=CC=C5C3=C3CNC(=O)C3=C2C2=CC=CC=C2N1C1CC(NC)C(OC)C4(OC)O1 CGPUWJWCVCFERF-UHFFFAOYSA-N 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 229960002180 tetracycline Drugs 0.000 description 1
- 229930101283 tetracycline Natural products 0.000 description 1
- 235000019364 tetracycline Nutrition 0.000 description 1
- 150000003522 tetracyclines Chemical class 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
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- 230000002103 transcriptional effect Effects 0.000 description 1
- 239000012581 transferrin Substances 0.000 description 1
- DRTQHJPVMGBUCF-UHFFFAOYSA-N uracil arabinoside Natural products OC1C(O)C(CO)OC1N1C(=O)NC(=O)C=C1 DRTQHJPVMGBUCF-UHFFFAOYSA-N 0.000 description 1
- 229940045145 uridine Drugs 0.000 description 1
- 239000013603 viral vector Substances 0.000 description 1
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- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
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Images
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Description
(1)Wnt阻害剤及びFLT阻害剤から成る群より選択される1又は複数の物質を含む、血小板産生促進剤。
(2)Wnt阻害剤がC59である、(1)に記載の血小板産生促進剤。
(3)FLT阻害剤がFLT3阻害剤である、(1)に記載の血小板産生促進剤。
(4)更にROCK阻害剤を含む、(1)〜(3)のいずれかに記載の血小板産生促進剤。
(5)Wnt阻害剤及びFLT阻害剤から成る群より選択される1又は複数の物質と巨核球細胞及び/又はその前駆細胞とを接触させる工程を含む、血小板の製造方法。
(6)Wnt阻害剤がC59である、(5)に記載の方法。
(7)FLT阻害剤がFLT3阻害剤である、(5)に記載の方法。
(8)更にROCK阻害剤と前記巨核球細胞又はその前駆細胞とを接触させる工程を含む、(5)〜(7)のいずれかに記載の方法。
(9)前記巨核球細胞が不死化巨核球細胞である、(5)〜(8)のいずれかに記載の方法。
(10)前記多能性幹細胞がiPS細胞である、(9)に記載の方法。
(11)前記iPS細胞がヒト由来である、(10)に記載の方法。
本発明に係る血小板産生促進剤は、有効成分として、Wnt阻害剤及びFLT阻害剤から成る群より選択される1又は複数の物質を含む。Wntは分子量約4万の分泌型の糖タンパク質である。本明細書で使用する場合、「Wnt阻害剤」とは、Wntタンパク質が細胞に作用することにより活性化されるシグナル伝達(以下、単に「Wntシグナル伝達」という)を阻害する任意の物質、例えばWntタンパク質の発現又は機能(活性)を阻害する任意の物質を意味する。WNT阻害剤のターゲットとしてはβカテニン、PORCN、カゼインキナーゼ1、タンキラーゼ、グリコーゲンシンターゼキナーゼ3等が挙げられ、限定することを意図するものではないが、以下の化合物がWNT阻害剤として使用され得る。
βカテニン:
・Calphostin C
・Cardionogen 1
・CCT 031374 hydrobromide
・FH 535
・ICG 001
・iCRT 14
・IWP 4
・endo-IWR 1
・exo-IWR 1
・JW 67
・JW 74 New product
・PNU 74654
・TAK 715
・WAY 316606 hydrochloride
・XAV 939
・IWP 12
・IWP 2
・IWP L6
・Wnt-C59
・CKI 7 dihydrochloride
・(R)-CR8
・D 4476
・(R)-DRF053 dihydrochloride
・LH 846
・PF 4800567 hydrochloride
・PF 670462
・TA 01
・TA 02
・TAK 715
・JW 55
・MN 64
・TC-E 5001
・WIKI4
・XAV 939
・3F8
・A 1070722
・AR-A 014418
・BIO
・BIO-acetoxime
・CHIR 99021
・10Z-Hymenialdisine
・Indirubin-3'-oxime
・Kenpaullone
・L803
・L803-mts
・MeBIO
・NSC 693868
・SB 216763
・SB 415286
・TC-G 24
・TCS 2002
・TCS 21311
・TWS 119
・4-(2-(2-(benzo[b]thiophen-3-yl)-9-isopropyl-9H-purin-6-ylamino)ethyl)phenol(SR1);
・αナフトフラボン
・1,4-ジヒドロキシアントラキノン
・1,5-ジヒドロキシアントラキノン
・1,8-ジヒドロキシアントラキノン
・galangin
・レスベラトロール
・2-methyl-2H-pyrazole-3-carboxylic acid(2-methyl-4-o-tolylazo-phenyl)-amide(CH-223191);
・N-[2-(3H-indol-3-yl)ethyl]-9-isopropyl-2-(5-methyl-3-pyridyl)purin-6-amine(GNF351);
・2-(29-amino-39-methoxyphenyl)-oxanaphthalen-4-one(PD98059);
・(Z)-3-[(2,4-dimethylpyrrol-5-yl)methylidenyl]-2-indolinone(TSU-16);
・2-(29-amino-39-methoxyphenyl)-oxanaphthalen-4-one(PD98059);及び
・6,2’,4’-trimethoxyflavone(TMF)
・3’,4’-dimethoxyflavone(DMF)
他に、国際公開第2012/015914号にAhRアンタゴニストとして記載されている化合物を用いることもできる。
本発明に係る血小板の製造方法は、血小板産生促進剤と巨核球細胞及び/又はその前駆細胞とを接触させる工程を含む。血小板産生促進剤と細胞との接触は培地中で行うことができる。本明細書において「巨核球細胞」とは、生体内においては骨髄中に存在する最大の細胞であり、血小板を放出することを特徴とする。また、細胞表面マーカーCD41a、CD42a、及びCD42b陽性で特徴づけられ、他に、CD9、CD61、CD62p、CD42c、CD42d、CD49f、CD51、CD110、CD123、CD131、及びCD203cからなる群より選択されるマーカーをさらに発現していることもある。「巨核球細胞」は、多核化(多倍体化)すると、通常の細胞の16〜32倍のゲノムを有するが、本明細書において、単に「巨核球細胞」という場合、上記の特徴を備えている限り、多核化した巨核球細胞と多核化前の巨核球細胞の双方を含む。「多核化前の巨核球細胞」は、「未熟な巨核球細胞」、又は「増殖期の巨核球細胞」とも同義である。
不死化巨核球株(MKCL SeV2)は、Nakamura, et al. Cell Stem Cell,2014に記載の方法に従い、iPS細胞(SeV2: neonate human fibroblastへWO2010/134526の方法に従って、センダイウィルスベクターによりc-MYC, OCT3/4, SOX2およびKLF4を導入することによって作製した細胞) にBcl-xL、c?MycおよびBmi1を導入することで調製した。Okita K, et al, Stem Cells. 31(3):458-466, 2013に記載の方法に従って、不死化巨核球株(MKCL SeV2)からiPS細胞(MK iPS #12)を製造した。得られたiPS細胞(MK iPS #12)は、Nakagawa M, et al, Sci Rep. 8;4:3594, 2014に記載の方法に従って、StemFit(登録商標)AK03(Ajinomoto)及びlaminin 511(iMatrix 511(Nippi))を用いて培養した。
iPS細胞(MK iPS #12)をTrypLE(登録商標) Select にて剥離し、0.8 x106個を1.7μg template vector(図1A)、1.7μg guide vector(図1B)及び1.7μg cas9 vector(pHL-EF1a-SphcCas9-iC-A、京都大学iPS細胞研究所 堀田博士より受領)と混和し、Human Stem Cell Nucleofector(登録商標) Kit 2(Lonza)及びNucleofectorを用いてelectroporationにより細胞にベクターを導入した。electroporation後、StemFit(登録商標) AK03で懸濁、laminin 511をコーティングした10cm dishに播種し、37℃ 5%CO2 条件下で培養した。3日後、puromycineを1ng/mlとなるように培地に添加し培養を継続した。7日後、形成したコロニーをピックアップし、得られた各コロニーからQIAamp DNA Mini Kit (QIAGEN)を用いてDNAを抽出し、プライマー(TUBB1 insert check Fw及びRv、5-1 insert check Fw及び5-1.2 insert check Rv、ならびに3-1.2 insert check Fw及び3-2 insert check Rv、配列は表1に示す)を用いてGenotyping PCRにより相同組換えを確認した。ホモで相同組換えができたiPS細胞株を拡大培養し、MK iPS#12-23として樹立した。
iPS細胞(MK iPS #12-23 cre2)より、iPS-sacを介して造血前駆細胞(HPC)の誘導を行った。詳細には、iPS細胞をセルスクレーパーを用いて培養皿から細胞を剥離させ、1/20程度の細胞を、コロニーの塊として、マイトマイシンC(MMC)処理したC3H10T1/2(理研から入手可能)上へ播種した。なお、MMC処理したC3H10T1/2は、iPS細胞を播種する前日に8x105cells / dishで10cm dishへ播種して用意した。播種後、20 ng / ml VEGFを添加したEagel’s Basal Medium (EBM)中で5% O2、5% CO2、37℃環境下で培養を開始した(day0)。2回/1週間の頻度で同じ培地にて培地交換を行った。
上述の方法で得られた不死化巨核球株を0.75 μM StemRegenin1(SR1)(Selleckchem)、10 μM Y-27632(wako)、50 ng/ml TPO(R&D)及び50 ng/ml SCF(R&D)を添加した分化培地中で7日間培養し、細胞を懸濁後、培養上清より細胞を回収し、抗CD41抗体及び抗CD42b抗体で染色しFACSにて解析した。同様に、誘導途中の細胞もFACS解析を行なった。その結果、培養7日目に、CD41及びCD42b両陽性の巨核球が誘導され、当該巨核球から血小板が産生されていることを確認した(図2)。
続いて、Wnt阻害剤及びFLT3阻害剤の血小板産生促進効果を検討した。上記レポーター不死化巨核球細胞株(MKCL#12-23 cre2)を96well dishにて、所定の濃度の各種阻害剤、10 μM Y-27632、50 ng/ml TPO及び50 ng/ml SCFを添加した分化培地中、又は0.75 μM SR1、10 μM Y-27632、50 ng/ml TPO及び50 ng/ml SCFを添加した分化培地中(陽性コントロール)、又は0.1% DMSO、10 μM Y-27632、50 ng/ml TPO及び50 ng/ml SCFを添加した分化培地中(陰性コントロール)で培養し、培養7日目に細胞のVENUSの蛍光強度を測定したところ、Wnt阻害剤およびFLT3阻害薬を添加した培地では蛍光強度が増加した。各阻害剤を用いた場合の血小板数を、陽性コントールでの血小板数(100%とする)及び陰性コントロールでの血小板数(0%とする)で補正して、相対蛍光強度を算出した結果を図3に示す。
Claims (8)
- Wnt阻害剤及びFMS様チロシンキナーゼ(FLT)阻害剤から成る群より選択される1又は複数の物質を含み、Wnt阻害剤がC59であり、FLT阻害剤がTCS−359である、巨核球細胞における血小板産生促進剤。
- 更にROCK阻害剤を含む、請求項1に記載の血小板産生促進剤。
- Wnt阻害剤及びFLT阻害剤から成る群より選択される1又は複数の物質と巨核球細胞とを培地中で接触させる工程を含み、Wnt阻害剤がC59であり、FLT阻害剤がTCS−359である、血小板の製造方法。
- 更にROCK阻害剤と前記巨核球細胞とを接触させる工程を含む、請求項3に記載の方法。
- 前記巨核球細胞が不死化巨核球細胞である、請求項3又は4に記載の方法。
- 前記巨核球細胞が多能性幹細胞に由来する、請求項5に記載の方法。
- 前記多能性幹細胞がiPS細胞である、請求項6に記載の方法。
- 前記iPS細胞がヒト由来である、請求項7に記載の方法。
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Application Number | Priority Date | Filing Date | Title |
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