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Compd.RPI3-kinase inhibition Ki/μmol·L-1fMLP IC50/μmol·L-1
p110γp110αp110δp110β
5-0.110.110.211.432.8
6H0.230.200.191.361.93
7Cl0.0570.0350.0791.301.93
8Br0.0320.0110.0610.550.34
9F0.1830.1220.2471.410.22
10CN0.0620.0450.0790.760.30
11CF30.0610.0280.0740.870.29
12-0.1100.0300.0190.410.32
13-0.2600.1900.2601.941.76
), ArticleFig(id=1201124492283174998, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=CN, label=Table 1, caption=

Inhibition of PI3K by typical compounds

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Compd.RPI3-kinase inhibition Ki/μmol·L-1fMLP IC50/μmol·L-1
p110γp110αp110δp110β
5-0.110.110.211.432.8
6H0.230.200.191.361.93
7Cl0.0570.0350.0791.301.93
8Br0.0320.0110.0610.550.34
9F0.1830.1220.2471.410.22
10CN0.0620.0450.0790.760.30
11CF30.0610.0280.0740.870.29
12-0.1100.0300.0190.410.32
13-0.2600.1900.2601.941.76
), ArticleFig(id=1201124492383838302, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
Compd.RPI3-kinase inhibition Ki/μmol·L-1
p110αp110γp110δp110β
14H0.1875.813.62> 10
15F0.0503.062.90> 10
16CF30.0201.141.67> 10
17-0.0050.530.222.0
18-0.0401.190.542.94
19-0.110.120.0030.86
20-0.151.020.0040.34
21-2.130.020.280.09
22-1.890.0880.740.25
23-1.400.0360.470.32
), ArticleFig(id=1201124492484501611, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=CN, label=Table 2, caption=

Structure and activity of typical compounds with elongation of right-hand side fragment

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Compd.RPI3-kinase inhibition Ki/μmol·L-1
p110αp110γp110δp110β
14H0.1875.813.62> 10
15F0.0503.062.90> 10
16CF30.0201.141.67> 10
17-0.0050.530.222.0
18-0.0401.190.542.94
19-0.110.120.0030.86
20-0.151.020.0040.34
21-2.130.020.280.09
22-1.890.0880.740.25
23-1.400.0360.470.32
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Compd.Tmax/hCmax/μmol·L-1AUC/μmol·L-1·hF/%CL/mL·min-1·kg-1t1/2/hVss/L·kg-1
1740.284.121210.71.29
2080.050.693180.60.4
220.51.7210.857230.81.4
2310.494.3244.01.80.6
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The pharmacokinetics of typical compounds in rats

, figureFileSmall=null, figureFileBig=null, tableContent=
Compd.Tmax/hCmax/μmol·L-1AUC/μmol·L-1·hF/%CL/mL·min-1·kg-1t1/2/hVss/L·kg-1
1740.284.121210.71.29
2080.050.693180.60.4
220.51.7210.857230.81.4
2310.494.3244.01.80.6
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Compd.XR1R2PI3-kinase inhibition Ki/μmol·L-1CL/μL·min-1·mg-1CYP 3A4 IC50/μmol·L-1
p110γp110αp110δp110β
24NCH30.007 51.80.350.2162> 10
25CHCH30.0144.40.330.4377> 10
26CHCH30.0051.20.290.2529> 10
27CHCH30.0194.12.01.141> 10
28NCH30.0164.00.961.436> 10
29CHCH32.7> 9.14.24.6104Not test
30CHCH30.624.90.590.93186Not test
31CHCH3> 9.18.23.3> 1036Not test
32NCH30.0191.20.290.3244Not test
33NCH30.0201.80.690.6153> 10
34NCH30.32> 9.1Not testNot testNot testNot test
35CHH0.009 53.91.10.8327> 10
36CHCl0.0395.50.431.417Not test
37NCH30.0161.20.340.4196Not test
38NCH30.0123.10.810.6947Not test
), ArticleFig(id=1201124493092675744, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=CN, label=Table 4, caption=

Inhibition of p110α, p110β, p110δ and p110γ activity, in vitro metabolic clearance using rat liver microsomes and CYP450 3A4 inhibition

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Compd.XR1R2PI3-kinase inhibition Ki/μmol·L-1CL/μL·min-1·mg-1CYP 3A4 IC50/μmol·L-1
p110γp110αp110δp110β
24NCH30.007 51.80.350.2162> 10
25CHCH30.0144.40.330.4377> 10
26CHCH30.0051.20.290.2529> 10
27CHCH30.0194.12.01.141> 10
28NCH30.0164.00.961.436> 10
29CHCH32.7> 9.14.24.6104Not test
30CHCH30.624.90.590.93186Not test
31CHCH3> 9.18.23.3> 1036Not test
32NCH30.0191.20.290.3244Not test
33NCH30.0201.80.690.6153> 10
34NCH30.32> 9.1Not testNot testNot testNot test
35CHH0.009 53.91.10.8327> 10
36CHCl0.0395.50.431.417Not test
37NCH30.0161.20.340.4196Not test
38NCH30.0123.10.810.6947Not test
), ArticleFig(id=1201124493218504874, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
Compd.IC50/μmol·L-1
Rat1-myr p110αRat1-myr p110βRat1-myr p110δ
170.1302.10.62
240.0393.11.5
250.0618.00.72
260.0742.21.2
270.64> 10> 10
280.105.91.3
29> 10> 105.8
302.5> 100.77
31Not testNot testNot test
320.236.41.6
330.447.3> 10
344.6> 10> 10
350.142.42.9
360.34> 104.9
370.174.42.5
380.159.63.0
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Inhibition of Akt phosphorylation in Rat1-myr-p110s cells

, figureFileSmall=null, figureFileBig=null, tableContent=
Compd.IC50/μmol·L-1
Rat1-myr p110αRat1-myr p110βRat1-myr p110δ
170.1302.10.62
240.0393.11.5
250.0618.00.72
260.0742.21.2
270.64> 10> 10
280.105.91.3
29> 10> 105.8
302.5> 100.77
31Not testNot testNot test
320.236.41.6
330.447.3> 10
344.6> 10> 10
350.142.42.9
360.34> 104.9
370.174.42.5
380.159.63.0
), ArticleFig(id=1201124493541466308, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
Compd.Structuret1/2/hCL/mL·min-1·kg-1Vss/L·kg-1PPB/%
in vivoin vitro
241.221621.294.0
253.439771.4Not test
262.910291.994.3
381.78470.997.1
), ArticleFig(id=1201124493667295433, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1201124484414661234, language=CN, label=Table 6, caption=

Pharmacokinetic parameters of typical compounds in female Sprague Dawley rats at 1 mg·kg-1 iv

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Compd.Structuret1/2/hCL/mL·min-1·kg-1Vss/L·kg-1PPB/%
in vivoin vitro
241.221621.294.0
253.439771.4Not test
262.910291.994.3
381.78470.997.1
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治疗PI3Kα变异的乳腺癌药物阿吡利塞
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郭宗儒
药学学报 | 新药发现与研究实例简析 2024,59(3): 784-788
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药学学报 | 新药发现与研究实例简析 2024, 59(3): 784-788
治疗PI3Kα变异的乳腺癌药物阿吡利塞
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郭宗儒
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  • 中国医学科学院、北京协和医学院药物研究所, 北京 100050
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出版时间: 2024-03-12 doi: 10.16438/j.0513-4870.2019-1004
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郭宗儒. 治疗PI3Kα变异的乳腺癌药物阿吡利塞. 药学学报, 2024 , 59 (3) : 784 -788 . DOI: 10.16438/j.0513-4870.2019-1004
. Acta Pharmaceutica Sinica, 2024 , 59 (3) : 784 -788 . DOI: 10.16438/j.0513-4870.2019-1004
新药创制是复杂的智力活动, 涉及科学研究、技术创造、产品开发和医疗效果等多维科技活动。每个药物都有自身的研发轨迹, 而构建化学结构是最重要的环节, 因为它涵盖了药效、药代、安全性和生物药剂学等性质。本栏目以药物化学视角, 对有代表性的药物的成功构建, 加以剖析和解读。
本品是FDA首个针对PI3Kα发生突变的乳腺癌的治疗药。诺华公司研制过程是以分子对接提供的结构信息作指导, 以选择性抑制α亚型为目标, 针对靶标特有的残基作互补性的配体设计, 分子设计中还兼顾化合物的代谢稳定性, 在活性/选择性/成药性等因素中优化出最佳化合物阿吡利塞(alpelisib), 并以复合物的晶体结构证明当初的虚拟对接提供的信息是正确和成功的导向。
(编者按)
磷脂酰肌醇-3-激酶(PI3K) 是催化磷脂酰肌醇环上3′-羟基磷酸化的激酶家族, 在调控细胞过程中扮演重要角色, 包括细胞代谢、存活、迁移和激活等。根据这些脂质激酶结构的不同和底物的特异性, 该家族可分为Ⅰ、Ⅱ和Ⅲ三类, 其中Ⅰ类研究得最充分, 又分为IA和IB亚型, PI3K的IA蛋白是由一个调控/衔接蛋白(85 kDa) 和三个110 kDa的催化亚基(p110α、p110β和p110δ) 构成, IB蛋白为一个p110γ构成, 后者被G蛋白偶联受体活化。
制药公司研发PI3K抑制剂的目标是治疗癌症、心血管、呼吸、免疫和炎性疾病的药物。最早的抑制剂例如wortmannin (1) 和LY294002 (2) 只作为工具药。后来发现的泛PI3K抑制剂PIK90 (3) 和p110γ抑制剂(4) 等都没有进入临床研究。
用闪烁迫近分析法(SPA) 评价受试物对重组的PI3K激酶(p110γ、p110α、p110δ和p110β) 的抑制活性, 测定三磷酸腺苷(ATP) 的末端磷酸基转移到磷脂酰肌醇的生成量, 来计算受试物抑制酶活性的半数有效浓度(IC50)。
评价受试物对细胞的活性是测定人嗜中性粒细胞和B细胞增殖时对呼吸爆发的抑制作用。呼吸爆发实验是用趋化肽f-Met-Leu-Phe (fMLP) 模拟在细菌感染时细胞释放N-甲酰肽的作用, 细菌感染引起嗜中性粒细胞募集并释放出活性氧簇物。这个过程主要依赖于p110γ和p110α、p110δ亚型, 而B细胞的增殖是p110δ依赖过程。
用生物化学方法高通量筛选化合物对p110γ的抑制作用, 发现化合物5有一定的选择性, 对p110γ抑制活性IC50 = 0.11 μmol·L-1, 而对大多数激酶没有作用, 因此5作为先导物。
化合物5分子对接到p110γ晶体结构(图 1), 提示5结合于ATP位点, 噻唑环的N和酰胺的H原子与Val-882的NH和C=O形成双齿型氢键, 磺酰胺的氧原子与Lys-883形成氢键。苯环的上下与Ile-879和Ile-576疏水链发生疏水相互作用。噻唑环上的甲基结合于Tyr-867、Val-882和Ile-963构成的疏水腔。
化合物5对PI3K激酶亚型缺乏选择性(表 1), 这是因为各激酶之间的ATP结合域相当保守, 相似性高的缘故。为了区分之间的差异, 提高对p110γ选择性, 在苯环上作不同的取代, 而且还为提高对细胞的过膜性降低5的极性(5的极性表面积PSA = 102 Å2), 将氨磺酰基变换为甲磺酰基(例如化合物6, PSA = 76 Å2) 或吡唑环取代(例如化合物12, PSA = 62 Å2), 或乙酰基取代(例如化合物13, PSA = 59 Å2), 合成的代表性化合物列于表 1, 表中fMLP栏的数据是对细胞的抑制活性。在甲磺酰基的邻位引入吸电子基团(7~11) 大多提高了酶和细胞的抑制活性, 而且对p110β的活性降低。1213的活性也有类似的变化。表 1的构效关系提示, 变换为甲磺酰基化合物6的抑酶活性略低于化合物5, 但提高了细胞活性。
基于分子对接的结构特征, 若将分子右侧氨基噻唑片段引长, 使抑制剂的结合样式越出保守的ATP结合域, 目的是提高对细胞的活性和对不同亚型的选择性。为此, 用Bohdan自动合成仪合成了集中库, 即由2-氨基噻唑合成了经脲基结构连接出不同的片段, 合成了400多个目标物, 发现大部分目标物显示对PI3K激酶有泛抑制作用, 那些对亚型具有选择性的代表性化合物列于表 2。构效关系提示含有S-四氢吡咯酰氨的化合物14~17对p110α亚型有强选择性抑制活性, 17对p110α活性达到0.005 μmol·L-1, 即使苯并噻唑连接了S-四氢吡咯酰氨(18) 也对α亚型有较高的活性。末端含有胺基异噁唑环的化合物1920对p110δ显示有选择性活性。末端含有叔丁基(酯或酰胺) 的化合物2122, 以及含有四唑基的化合物23则对p110γ亚型有强抑制活性, 强于p110α的选择性在20倍以上。
对于不同亚型有选择性活性的化合物用大鼠做初步药代实验, 表明化合物2223的生物利用度和消除半衰期略优于受试物1720 (表 3, 数据从略) (Bruce I, Akhlaq M, Bloomfield GC, et al. Development of isoform selective PI3-kinase inhibitors as pharmacological tools for elucidating the PI3K pathway. Bioorg Med Chem, 2012, 22: 5445-5450)。
化合物17对p110α显示强效抑制活性, 分子模拟提示四氢吡咯环上的酰胺基与p110α亚型的Gln859发生氢键结合, N-苯基吡唑片段处于由Ile800、Pro778和Met772组成的疏水腔中。为了优化对p110α的活性, 合成了变换N-苯基吡唑片段或四氢吡咯的化合物24~32, 列于表 4
首先合成了化合物24, 经分子对接到已有晶体结构的p110α的ATP结合腔中(图 2), 表明四氢吡咯环外酰胺NH作为给体与Ser854骨架羰基形成氢键, 而酰胺的羰基和氮原子与Gln859形成两对氢键。然而, 在p110β、p110δ和p110γ亚型的859残基分别为Asp、Asn和Lys, 难以同酰胺发生二齿氢键结合, 提示Gln859是设计p110α选择性抑制剂的重要残基。
基于化合物24对接提供的信息, 设计合成的化合物列于表 4。构效关系分析如下: ①嘧啶环上N3没有同ATP结合腔内极性原子或基团发生极性结合作用, 因而变换成C3的吡啶化合物25对p110α激酶的活性没有显著变化。②将酰胺N甲基化(29) 或去除酰胺片段(30) 或酰胺处于R构型(31) 都使活性降低, 提示酰胺片段与Gin859形成二齿型氢键是提高活性和选择性的必要因素。③化合物3224的结构区别是氮杂环丁烷替换四氢吡咯, 32的活性显著降低, 是因为p110α的His855侧链咪唑环与氮杂环丁烷的范德华作用力低于四氢吡咯, 而其他亚型的残基不是组氨酸, 因而活性都很差。④化合物24的叔丁基被三氟叔丁基(26) 替换, 提高了对p110α的抑制活性, 是因为叔丁基所处的由Ile800、Ile848和Lys802构成的疏水腔未曾被甲基完全充满, 用体积较大的三氟叔丁基提高了与疏水腔的相互作用。反之, 用体积较小的异丙基(28) 或环丁基(33) 替换, 降低了活性。⑤三氟叔丁基替换叔丁基的另一个优点是提高了代谢稳定性, 例如26的清除率(CL) 显著低于25, 其他含有三氟叔丁基的化合物(如3536) 也降低了CL值。这也提示了叔丁基是个代谢位点。⑥ 353626的区别在于噻唑环上的甲基用氢或氯原子置换, 清除率未见显著变化, 提示该甲基不是代谢位点。
上述的目标化合物进一步评价了对PI3K亚型有不同表达的Rat1-myr细胞抑制活性, 是测定受试物阻断PI3K/Akt激酶通路的能力, 即抑制Akt激酶对目标蛋白的磷酸化的程度, 表征对高表达PI3K亚型的抑制活性, 结果列于表 5, 表明对细胞的抑制作用与抑制相应酶活性的构效关系是相同的, 而且24~26抑制依赖于PI3Kα的Akt活性可达到纳摩尔水平。虽然2425的细胞活性稍强于26, 但体外的代谢稳定性不如化合物26
化合物24382526之间嘧啶环或吡啶环上的叔丁基变换成甲基环丙基或三氟叔丁基, 在雌性大鼠体内的清除率显著降低(表 6), 是因为位阻和三氟甲基拉电子效应难以发生氧化代谢的缘故。尤其是化合物26的大鼠、小鼠和犬有良好的口服生物利用度(数据省略), 对CYP450未显示有抑制作用等。而且对多种激酶(50倍于PI3Kα的IC50浓度) 没有抑制作用, 显示出对PI3Kα的选择性作用。从而确定26为候选化合物, 定名为阿吡利塞(alpelisib), 经临床前的系统研究和Ⅲ期临床试验, 于2019年美国FDA批准上市, 口服治疗激素受体阳性、HER2阴性和PI3Kα发生突变的晚期乳腺癌患者。
阿吡利塞与PI3Kα复合物单晶经X-射线衍射分析, 表明结合于激酶的ATP结合腔中, 侧链的酰胺与Gln859的侧链形成二齿性氢键(图 3中下部的虚线所示), 这与前述分子对接提示只有PI3Kα可发生二齿氢键的选择性结合相一致。此外晶体结构还显示, 在由Tyr836、Asp810、Asp933和Lys802构成的腔穴中, 吡啶环上的氮原子参与了与3个水分子形成的氢键网络, 而且Lys802侧链的NH2与三氟甲基的氟原子还形成氢键。
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doi: 10.16438/j.0513-4870.2019-1004
  • 首发时间:2025-11-28
  • 出版时间:2024-03-12
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    中国医学科学院、北京协和医学院药物研究所, 北京 100050
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species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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