JP6596624B2 - 抗腫瘍剤 - Google Patents
抗腫瘍剤 Download PDFInfo
- Publication number
- JP6596624B2 JP6596624B2 JP2015213702A JP2015213702A JP6596624B2 JP 6596624 B2 JP6596624 B2 JP 6596624B2 JP 2015213702 A JP2015213702 A JP 2015213702A JP 2015213702 A JP2015213702 A JP 2015213702A JP 6596624 B2 JP6596624 B2 JP 6596624B2
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- Prior art keywords
- betulin
- cancer
- added
- cells
- compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Landscapes
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Description
ベツリン誘導体(BD-23)の合成
中間体化合物1
1H NMR (CDCl3, 400MHz) δ 8.05(m, 2H), 7.56(m, 1H), 7.45(m, 2H), 4.72(br s, 1H), 4.61(br s, 1H), 4.52(br d, J=12.0 Hz, 1H), 4.10(br d, J=12.0 Hz, 1H), 3.19(m, 1H), 2.53(m, 1H), 2.11-1.88(m, 3H), 1.82-1.48(m, 9H), 1.71(s, 3H), 1.48-1.08(m, 11H), 1.07(s, 3H), 1.01(s, 3H), 0.968(s, 3H), 0.920(m, 1H), 0.835(s, 3H), 0.762(s, 3H), 0.690(br d, 1H)
15 mLの試験管に化合物1(200 mg)、テトラヒドロフラン(THF, 2 mL)、トリホスゲン(145 mg)および活性炭(16 mg)を加えた。反応容器を室温で約17時間撹拌した後、フィルターろ過して活性炭を除き、ろ液を減圧濃縮した。濃縮物にトルエンを少量加えて濃縮を2回繰り返した後、N,N-ジメチルホルムアミド(DMF, 2 mL)に溶解した。この半量にN-Boc-エチレンジアミン(35 mg)のDMF(1 mL)溶液およびトリエチルアミン(33.1μL)を加えて約17時間撹拌した。再度N-Boc-エチレンジアミン(15 mg)を加えて4時間撹拌した後、反応液に5 %クエン酸水溶液(7 mL)を加え、酢酸エチル(2 mL×3回)で抽出した。有機層を飽和食塩水(1 mL)で洗浄し、無水硫酸ナトリウムで乾燥した後、減圧濃縮し、化合物2の粗体を得た。これをシリカゲルカラム(関東化学, 球状, 中性, 63-210μm, 5 g)で精製し(n-ヘキサン100 %→n-ヘキサン/酢酸エチル=5/1→3/1→1/1)、化合物2を得た(123 mg)。
15 mLの試験管に化合物1(150 mg)、THF(2 mL)、トリホスゲン(108 mg)および活性炭(8 mg)を加えた。反応容器を室温で約16時間撹拌した後、フィルターろ過して活性炭を除き、ろ液を減圧濃縮した。濃縮物にトルエンを少量加えて濃縮を2回繰り返した後、DMF(0.5 mL)に溶解した。そこにN-Boc-エチレンジアミン(62 mg)のDMF(1.5 mL)溶液およびトリエチルアミン(0.154 mL)を加えて約16時間撹拌した。反応液に5 %クエン酸水溶液(8 mL)を加え、酢酸エチル(2 mL×3回)で抽出した。有機層を飽和食塩水(2 mL)で洗浄し、無水硫酸ナトリウムで乾燥した後、減圧濃縮し、化合物2の粗体を得た(179 mg, 化合物1を含有していたが、そのまま次工程の反応に用いた)。
H NMR (CDCl3, 400MHz) δ 8.05(m, 2H), 7.56(m, 1H), 7.45(m, 2H), 4.95(br s, 1H), 4.83(br s, 1H), 4.72(br s, 1H), 4.61(br s, 1H), 4.52(br d, J=11.0 Hz, 1H), 4.34(m, 1H), 4.09(br d, J=11.0 Hz, 1H), 3.35-3.18(m, 4H), 2.52(m, 1H), 2.10-1.88(m, 3H), 1.81-1.53(m, 9H), 1.71(s, 3H), 1.44(s, 9H), 1.53-1.08(m, 11H), 1.06(s, 3H), 1.00(s, 3H), 0.875(br s, 3H), 0.848(s, 3H), 0.792(m, 4H)
15 mLの試験管に化合物2(121 mg)、1,4-ジオキサン(0.5 mL)、メタノール(0.5 mL)および2 mol/L水酸化ナトリウム水溶液(0.165 mL)を加え、50℃で約3時間撹拌した。反応液に水(1 mL)を加えた後、減圧濃縮して1,4-ジオキサンおよびメタノールを留去し、酢酸エチル(2 mL×2回)で抽出した。有機層を飽和重曹水(1 mL×2回)、水(1 mL)次いで飽和食塩水(1 mL)で順次洗浄し、無水硫酸マグネシウムで乾燥した後、減圧濃縮し、無色油状物を得た(97 mg)。これをシリカゲルカラム(関東化学, 球状, 中性, 63-210μm, 5 g)で精製し(n-ヘキサン100 %→n-ヘキサン/酢酸エチル=3/1→2/1→1/1)、無色油状の化合物3を得た(100 mg)。
15 mLの試験管に化合物2の粗体(179 mg)、1,4-ジオキサン(0.5 mL)、メタノール(0.5 mL)および2 mol/L水酸化ナトリウム水溶液(0.274 mL)を加え、50℃で約3時間撹拌した。反応液を減圧濃縮し、水(4 mL)を加えて、酢酸エチル(2 mL×2回)で抽出した。有機層を飽和重曹水(1.5 mL×2回)、水(1 mL)次いで飽和食塩水(1 mL)で順次洗浄し、無水硫酸マグネシウムで乾燥した後、減圧濃縮し、化合物3を得た(179 mg, 精製は行わず、このまま次の反応に用いた)。
ESI MS m/z : [M+H]+ Calcd for C38H65N2O5 629.49 ; Found : 629.60
15 mLの試験管に化合物3(100 mg)、4mol/L塩酸/1,4-ジオキサン(2 mL)を加え、室温で2時間撹拌した。反応液を減圧濃縮し、ジクロロメタンを加えて3回濃縮を繰り返し、BD-023の粗体を得た(66 mg)。
15 mLの試験管に化合物3(179 mg)、4mol/L塩酸/1,4-ジオキサン(2 mL)を加え、室温で2時間撹拌した。反応液を減圧濃縮し、ジクロロメタンを加えて2回濃縮を繰り返し、BD-023の粗体を得た(129 mg)。
H NMR (DMSO-d6, 400MHz) δ 7.73(br s, 3H), 7.10(br t, 1H), 4.67(br s, 1H), 4.54(br s, 1H), 4.22(br t, 2H), 3.52(br d, J=10.4 Hz, 1H), 3.20(m, 2H), 3.08(br d, J=10.4 Hz, 1H), 2.85(m, 2H), 2.38(m, 1H), 1.88(m, 3H), 1.75-0.86(m, 21H), 1.63(s, 3H), 0.986(s, 3H), 0.944(s, 3H), 0.828(s, 3H), 0.805(m, 3H), 0.786(s, 3H),
ESI MS m/z : [M+H]+ Calcd for C33H57N2O3 529.44 ; Found : 529.48
ベツリン誘導体(BD-24)の合成
実施例2及び3においては、融点(m.p.)は、柳本融点測定器を用いて測定し、数値は未補正である。比旋光度([α])は、ナトリウムD線を用い、Atago製で測定した。1H及び13C NMRスペクトルは、Bruker Biospin製AVANCE II 400を用いて測定した。化学シフト値(ppm)は、tetramethylsilaneまたは測定溶媒の残留プロトンを内標準とし、スピン結合定数はJ値(Hz)で示した。IRスペクトル(ATR-IR)は、PerkinElmer製Spectrum 100を用いて測定した。LRMS及びHRMSは、Burker Dartonics製micrOTOF focusを用いて測定した。全ての反応は、Merck製silica gel 60F254を用いてモニタリングした。カラムクロマトグラフィーは、関東化学製silica gel 60N(63-210 mm)を用いた。
Rf = 0.38 (hexane : EtOAc = 5 : 1).1H NMR (400 MHz, CDCl3) δ = 0.01 (3H, s, TBDMS), 0.05 (3H, s, TBDMS), 0.63-1.64 (27H, m), 0.72 (3H, s), 0.79 (3H, s), 1.85-1.94 (3H, m), 2.35 (1H, dt, J = 6.0 and 4.8 Hz), 3.15 (1H, dd, J = 6.0 and 5.2 Hz), 3.22 (1H, d, J - 9.6 Hz), 3.63 (1H, d, J = 10.0 Hz), 4.52 (1H, s, olefinic), 4.63 (1H, s, olefinic). 13C NMR (125 MHz, CDCl3) δ = -5. 5, -3.6, 14.8, 15.4, 15.9, 16.1, 17.9, 18.2(9), 18.3, 19.1, 20.9, 25.3, 25.7, 26.0, 27.1, 27.4, 28.0, 29.5, 30.0, 34.2, 34.3, 37.2, 37.4, 38.7, 38.9, 40.9, 42.7, 48.1, 48.4, 50.4, 55.3, 60.5, 79.0, 109.4, 151.0.
Rf = 0.44 (EtOAc). 1H NMR (400 MHz, CDCl3) δ = 1.43 (27/5H, s, tBu), 1.51 (24/5H, s, tBu and acetonide), 1.54 (9/5H, s, acetonide), 1.63 (6/5H, s, acetonide), 1.67 (9/5H, s, acetonide), 4.08-4.2 2 (2H, m, H-5), 4.41 (3/5H, dd, J = 5.6 and 2.4 Hz, H-4), 4.53 (2/5H, dd, J = 4.8 and 2.4 Hz, H-4), 11.04 (1H, br). 13C NMR (125 MHz, CD Cl3) δ = (major rotamer) 24.7, 28.0, 53.3, 58.9, 66.0, 80.5, 151.1, 175.9; (minor rotamer) 24.1, 28.2, 53.6, 60.4, 65.7, 81.3, 94.5, 152.5, 175.1.
Rf = 0.43(hexane : EtOAc = 3 : 1). 1H NMR (400 MHz, CDCl3) δ = 0.04 (6H, s, TBDMS), 0.89-1.68 (58H, m), 1.85-1.98 (3H, m), 2.40 (1H, dt, J = 6.0 and 4.8 Hz), 3.25 (1H, d, J = 9.6 Hz), 3.67 (1H, d, J = 10.0 Hz), 4.02-4.17 (2H, m), 4.37 (1/2H, dd, J = 6.8 and 2.0 Hz), 4.48 (1/2H, dd, J = 6.4 and 2.4 Hz), 4.53-4.56 (2H, m), 4.67 (1H, br s). 13C NMR (100 MHz, CDCl3) δ = -5.5, 14.2, 14.7, 15.8, 16.1, 16.6, 17.6, 18.1, 18.3, 19.0, 20.8, 21.0, 22.6, 23.6, 23,7, 24.1, 25.1, 25.1(4), 25.5, 25.6, 25.9, 26.0, 27.0, 27.7, 28.1, 28.3, 28.4, 29.4, 29.9, 31.5, 34.0, 34.3, 37.0, 37.3, 37.8, 37.9, 38.3, 40.9, 42.6, 48.0, 48.3, 50.3, 55.3(4), 55.4, 59.6, 59.7, 60.3, 60.4, 66.3, 66.7, 80.3, 80.6, 82.2, 94.2, 95.0, 109.4, 150.8, 151.3, 151.8, 170.9, 171.0,
[α]D24 +28.8 (c 1.04, CHCl3). 1H NMR (400 MHz, DMSO-d6NMR (100 MHz, DMSO-d6) δ = 14.5, 15.6, 15.8, 16.4, 17.7, 18.8, 20.4, 23.5, 24.8, 26.7, 27.6, 29.0, 29.3, 33.6, 33.8, 36.6, 36.7, 37.5, 37.7, 40.4, 42.2, 47.3, 47.4, 48.1, 49.5, 50.2, 54.6, 56.5, 57.9, 64.2, 80.0, 109.6, 150.4, 173.7. LRMS (ESI+) m/z = 530 ([M+H]+, 100). HRMS (ESI+) m/z = [M+H]+: calcd for C33H56NO4 530.4203; found 530.4219.
がん移植マウスモデルを用いた評価
マウス悪性黒色腫細胞(B16F10)を2×105個/0.05mlPBSに調製し、C57BL/6マウス(8週令,雌,8-10匹/群)に1匹当たり0.05mlずつ下腹部皮下に接種した。化合物はがん接種後2日目から16日目まで1日1回、腫瘍内に投与した。対照群には溶媒(0.1% Tween 80を含む生理緩衝食塩水)を同様に投与した(50μl/マウス)。腫瘍径は2日あるいは3日ごとに測定し、見かけの腫瘍体積は、長径×短径×短径/2で算出した。好中球を除去したマウスを用いて評価を行う場合には、がん接種の翌日に抗Gr-1抗体(RB6-8C5)を腫瘍内及び尾静脈内にマウス1匹当たり各0.1mgずつ投与した。さらに、がん接種3日後、7日後、及び、11日後に同抗体を腫瘍内にマウス1匹当たり0.1mgずつ追加投与した。対照群にはコントロールIgG(ラット由来)を同様に投与した。化合物の投与及び腫瘍径の測定は上記と同様に行った。
10%FBSを含むDMEM培地(GIBCO)でB16F10細胞を4×104個/mlに調製し、96ウェルプレート(Corning)に各ウェル当たり4×103個を播種した。細胞がプレートに接着後、化合物を各濃度で添加し、インキュベーター内(37℃,5%CO2)で48時間培養した。コントロールにはジメチルスルホキシドを同様に添加した。培養終了後、各ウェルの培地を、WST-1(Wako)を5%含む10%FBS‐DMEM培地に交換し、さらに4時間培養した後、波長450 nmにおける吸光度を測定した。
マウス悪性黒色腫細胞(B16F10)を2×105個/0.05mlPBSに調製し、C57BL/6マウス(8週令,雌,3〜6匹/群)にマウス当たり0.05mlずつ下腹部皮下に接種した。がん接種後2日目から9日目まで1日1回、化合物をマウス当たり45nmolの用量で腫瘍内に投与した。対照群には溶媒(0.1% Tween 80を含む生理緩衝食塩水)を同様に投与した。がん組織は、がん接種後3日目、実験によっては6日目、あるいは、10日目に採取した。採取したがん組織を1mg/mlコラゲナーゼA(ロシュ)及び200U/ml DNaseI(Sigma)で処置(37℃,30分間)し、ハサミで細切後、ナイロンフィルター(70μmポアサイズ)(Falcon)を通してデブリスを除去した。遠心(1500rpm,10min)後、上清を除去し、得られた細胞を105個/mlとなるように調製した。細胞を抗CD16/32抗体(2.4G2)で処置(1.5μg/ml,4℃,15min)しFc受容体をブロックした後、各種の蛍光色素で標識された抗CD19抗体(1D3)、抗CD3e抗体(145-2C11)、抗NK1.1抗体(PK136)、抗CD11b抗体(M1/70)、抗Gr-1抗体(RB6-8C5)、抗CD11c抗体(HL3)、抗CD45抗体(30-F11)、抗siglec-F抗体(E50-2440)で処置(0.25-1.25μg/ml,4℃,0.5時間)した。細胞を洗浄後、7AADを添加してフローサイトメーター(FACSCantoII、日本BD)により測定した。
C57BL/6マウス(8週令,雌)の下腹部皮下に化合物をマウス当たり45nmol/50μl(0.1% Tween 80を含む生理緩衝食塩水)の用量で投与した。24時間後、投与部位の組織を採取して1mg/mlコラゲナーゼA(ロシュ)及び200U/ml DNaseI(Sigma)で処置(37℃,30分間)し、ハサミで細切後、ナイロンフィルター(70μmポアサイズ)(Falcon)を通してデブリスを除去した。遠心(1500rpm,10min)後、上清を除去し投与部位に集積した白血球を得た。この白血球を5×105個/mlから段階希釈で0.625×105個/mlとなるように調製し、96ウェルプレート(FALCON)に1ウェルあたり0.1mlずつ播種してエフェクター細胞とした。ターゲット細胞にはGFPを発現するB16F10マウス悪性黒色腫細胞を用い、105個/mlに調製して先と同じウェルに1ウェルあたり0.1mlずつ播種して混合した。インキュベーター内(5%CO2,37℃)で4時間処置後、7AADを添加して15分間処置し、7AAD陽性及び陰性の癌細胞の割合をフローサイトメーター(FACSCantoII、日本BD)により測定した。
マウスB16F10悪性黒色腫細胞の皮下移植モデルを用いて、ベツリン及びベツリン誘導体(BD-23,BD-24,TPU-22)の抗腫瘍効果を検討した(図1)。17日目における抑制率は、ベツリン45nmolあるいは150nmol投与群ではそれぞれ31.5%あるいは47.7%であったのに対して、BD-23投与群では99.5%、BD-24投与群では94.0%、TPU-22投与群では74.4%であり、ベツリン投与群よりも明らかに強い抗腫瘍効果が認められた。また、BD-24の抗腫瘍効果を5-FUの抗腫瘍効果と比較検討したところ、BD-24により強い抗腫瘍効果が認められた(図2)。
以上から、本発明のベツリン誘導体は、がん細胞増殖阻害作用に加えて好中球誘導作用を有することで効果的に抗腫瘍効果を発揮していることが明らかとなった。
Claims (5)
- 下記いずれかの化学式で示されるベツリン誘導体を有効成分として含有する抗腫瘍剤。
- ベツリン誘導体がBD-24である請求項1に記載の抗腫瘍剤。
- ベツリン誘導体がBD-23である請求項1に記載の抗腫瘍剤。
- ベツリン誘導体がTPU-22である請求項1に記載の抗腫瘍剤。
- 前記腫瘍が皮膚がんである請求項1〜4のいずれかに記載の抗腫瘍剤。
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