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CN100500221C - 用于眼科药物递送的生物可侵蚀膜剂 - Google Patents

用于眼科药物递送的生物可侵蚀膜剂 Download PDF

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CN100500221C
CN100500221C CNB038167921A CN03816792A CN100500221C CN 100500221 C CN100500221 C CN 100500221C CN B038167921 A CNB038167921 A CN B038167921A CN 03816792 A CN03816792 A CN 03816792A CN 100500221 C CN100500221 C CN 100500221C
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B·P·卡布拉
J·D·豪伊
Y·田
D·A·马尔什
G·格拉夫
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Abstract

含有水溶性、成膜聚合物和脂肪酸甘油酯或酯的药物递送膜剂组合物适于递送眼科药物。

Description

用于眼科药物递送的生物可侵蚀膜剂
发明背景
本发明涉及药物递送组合物。具体地,本发明涉及生物可侵蚀材料作为尤其可用于眼科药物递送的药物递送膜剂的用途。本发明的药物递送膜剂特别适于递送抗增殖剂如紫杉醇或喜树碱,以保持青光眼滤过手术中的泡的功能。
已报导紫杉醇或“红豆杉醇”在青光眼滤过手术中被用于保持泡的功能。紫杉醇已经在膜剂中递送,该膜剂由生物可降解聚合物如聚酐或聚交酯或由非生物可降解、不易侵蚀性聚合物如乙烯醋酸乙烯酯制备。生物可降解聚合物的不利之处是难以在非常短的时间、例如少于1周内将它们生物降解。非生物可降解的、不易侵蚀性药物剂量形式或者永久保留或者不得不手术除去。
使用生物可侵蚀的聚合物,已可将与青光眼过滤手术连同使用的抗增殖剂递送到眼中。参见例如Lee等人,Ophthalmology 103(5):800-807(1996年5月)。还参见Lee等人,Investigative Ophthalmology & Visual Science29:1692-1697(1988)以及Uppal等人,J.Ocular Pharmacology,10(2):471-479(1994)。
所需要的是适于将药物递送至眼的改进的生物可侵蚀的药物递送膜剂。
发明概述
本发明提供了尤其适于眼科药物递送的生物可侵蚀药物递送膜剂。该膜剂组合物含有(I)水溶性、成膜聚合物和(ii)脂肪酸甘油酯或酯。该药物递送膜剂适于递送任何眼科可接受的药物并特别可用作结膜下或眼球筋膜下(sub-Tenon’s)植入物。
本发明的药物递送膜剂较含有水溶性、成膜聚合物但不含脂肪酸甘油酯或酯的生物可侵蚀膜剂更有弹性。不被任何理论所束缚,据信脂肪酸甘油酯或酯成分减慢了膜剂的溶解并且可减慢药物从膜剂的释放。
本发明的药物递送膜剂的另一优势是它们是生物粘附性的,且当与青光眼滤过手术连同使用以递送抗增殖剂时,不需要缝合即可在植入后保持它们的位置。
附图简述
图1比较了使用实施例2中所述的简单药物释放方法所得的药物从药物递送膜剂组合物中的释放曲线。
图2比较了使用实施例3中所述更灵敏的药物释放方法所得的药物从药物递送膜剂组合物中的释放曲线。
图3比较了药物从5种药物递送膜剂组合物中的释放曲线:4种组合物含有相同量的不同脂肪酸甘油酯成分,1种组合物不含脂肪酸甘油酯成分(样品H、M、N、O和R)。
图4比较了药物从含有不同量的相同脂肪酸甘油酯成分的4种药物递送膜剂组合物(样品E、H、W和R)中的释放曲线。
发明详述
除非特别指出,所有以百分数表示的成分的量以%w/w给出。
本发明的药物递送膜剂组合物含有(I)水溶性、成膜聚合物和(ii)脂肪酸甘油酯或酯。水溶性、成膜聚合物是公知的并且包括但不限于羟丙基纤维素、聚乙烯醇、聚丙烯酸、羟丙甲基纤维素、羧甲基纤维素和羟乙基纤维素。这些聚合物是商业途径可得到的或者可以通过本领域公知的方法制备。优选的水溶性、成膜聚合物为羟丙基纤维素、聚乙烯醇和羧甲基纤维素。用于本发明的药物递送膜剂组合物中的最优选的水溶性、成膜聚合物为羟丙基纤维素。通常,本发明的药物递送膜剂组合物所含有的水溶性、成膜聚合物的量等于总组合物重量的25-99.5%。
如此处所用的“水溶性、成膜聚合物”不包括仅仅是生物可降解但非水溶性的聚合物,如聚酐和聚交酯(例如聚乳酸乙醇酸或“PLGA”),也不包括既非生物可降解又非水溶性的聚合物,如乙烯基醋酸乙烯酯。
优选地,本发明组合物中所含有的唯一聚合物成分是水溶性、成膜聚合物。
除了水溶性、成膜聚合物外,本发明的组合物还含有分子量为150-4000的脂肪酸甘油酯或酯,其中脂肪酸甘油酯或酯具有下式,
其中:
R1、R2和R3独立地为-H、-OH、-COOH、-CnH2n+1-2m、-OOCCnH2n+1-2m、-COOCnH2n+1-2m、-COO(CH2CH2O)nCH2CH2OH、-CnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OCnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OOCCnH2n+1-2mCOOCn’H2n’+1-2m’
n和n’独立地为0-50;且
m和m’独立地为0-10。
式(I)的脂肪酸甘油酯和酯是公知的。这些化合物可通过商业途径得到或者可通过本领域公知的方法制备。例如,甘油单、二和三酯化合物可通过商业途径得自供应商NuChek Prep(Elysian,明尼苏达)、QuestInternational(Hoffman Estates,伊利诺斯)和Eastman Chemical Company(Kingsport,Tennessee)——其生产商标为
Figure C03816792D00072
Figure C03816792D00073
的这些化合物,和Gattefossa(Saint-Priest,法国)——其生产商标为
Figure C03816792D00074
和SuppocireTM、OvucireTM
Figure C03816792D00075
的这类化合物。
优选式(I)化合物,其中R1、R2和R3独立地为-H、-OH、-COOH、-CnH2n+1-2m或-OOCCnH2n+1-2m
n和n’独立地为0-25;且
m和m’独立地为0-3。
一种商业途径可得到的用于本发明的药物递送膜剂组合物中的式(I)的脂肪酸甘油酯是可得自Eastman Chemical Company、市售为
Figure C03816792D00081
18-92的单酸甘油酯。18-92是精炼向日葵油甘油醇解的蒸馏产品,具有以下脂肪酸分布(根据生产商):7.0%甘油单棕榈酸酯(C16:0)、4.5%甘油单硬脂酸酯(C18:0)、18.7%甘油单油酸酯(C18:1)和67.5%甘油单亚油酸酯(C18:2)。
优选地,本发明的药物递送膜剂组合物含有熔点≤46℃的单一的式(I)脂肪酸甘油酯或式(I)脂肪酸甘油酯的混合物。最优选地,单一的式(I)脂肪酸甘油酯或式(I)脂肪酸甘油酯的混合物的熔点≤42℃。
该药物递送膜剂组合物含有的脂肪酸甘油酯或酯成分的量等于水溶性、成膜聚合物重量的0.5-25%。优选地,药物递送膜剂组合物中脂肪酸甘油酯或酯的量等于水溶性、成膜聚合物重量的1-10%。最优选地,脂肪酸甘油酯或酯成分的量等于水溶性、成膜聚合物重量的3-5%。
本发明的药物递送膜剂组合物还含有眼科可接受的药物。这些药物包括但不限于抗生素、抗炎、抗青光眼和抗增殖药物。优选的药物为紫杉醇。本发明组合物中所含药物的量将根据所治疗状况的性质和严重性以及患者中的植入位点和药物本身而异。但通常药物递送膜剂含有药物的量等于药物递送膜剂组合物的0.0001-25%。
除了(I)眼科药物、(ii)水溶性、成膜聚合物和(iii)分子量为150-4000的式(I)脂肪酸甘油酯或酯外,本发明的药物递送膜剂组合物任选包含一种或多种赋形剂。用于药物组合物的许多赋形剂是公知的。适宜的赋形剂的实例包括但不限于表面活性剂和稳定剂。适宜的表面活性剂包括泰洛沙泊、聚山梨酯20、聚山梨酯60、聚山梨酯80和聚乙氧基化蓖麻油衍生物(如Cremophor EL和HCO-40)。适宜的稳定剂包括螯合剂如乙二胺四乙酸二钠,和抗氧化剂如抗坏血酸和柠檬酸。
可将所述组合物制成适于放入眼中的任何形状。这些形状包括但不限于圆形、长方形、正方形和三角形。例如,当本发明的药物递送膜剂组合物含有紫杉醇并且旨在用于青光眼滤过手术中时,可将膜剂制成高为0.1-0.6mm的4.8mm2圆盘。
在一个实施方案中,本发明的组合物与穿透性(例如滤帘切除术)和非穿透性(例如粘弹性小管切开术(viscocanalostomy))青光眼滤过手术连同使用。标记“穿透性”或“非穿透性”指手术是否包括穿透进入前房。作为两种类型青光眼滤过手术的一部分,通过手术创建一个泡作为房水流出的贮库。通过手术创建泡后,将含有抗增殖药物的本发明的药物递送膜剂置于泡中,通过减少或消除使泡关闭的组织生长或伤口愈合而保持泡的功能。优选地,该膜剂含有抗增殖性药物紫杉醇,其用量使得膜剂向患者递送80-100μg的总剂量。在特别优选的实施方案中,该膜剂为4.8mm2圆盘,其高0.4-0.6mm,并含有0.5-1%(w/w)紫杉醇。优选地,本发明的药物递送膜剂与非穿透性青光眼滤过手术连同使用。
本发明的药物递送膜剂组合物尤其适于用作结膜下或眼球筋膜下植入物,还可用于眼中其他位置,包括玻璃体内位置。
以下实施例旨在阐明但不限制本发明。
实施例1
通过将羟丙基纤维素(HPC)、Mvyerol 18-92和紫杉醇溶于甲醇而制备两种不同的紫杉醇膜剂。将溶液置于容器中并通过蒸发甲醇得到膜剂(圆盘形)。这两种膜剂的组成和尺寸在表1中显示。
表1
 
膜剂A 膜剂B
组成(w/w%) 0.84%紫杉醇99.16%HPC   0.82%紫杉醇1.94%Mvyerol 18-9297.24%HPC       
用于膜剂制备的溶剂 甲醇 甲醇
圆盘膜剂的平均重量 9.60±0.43mg 10.03±0.50mg
圆盘膜剂的平均厚度 0.45-0.50mm 0.45-0.50mm
圆盘膜剂的直径 4.8mm 4.8mm
实施例2
制备16种不同紫杉醇膜剂(使用与实施例1中所述相同的方法)并在简单药物释放模型中评价紫杉醇释放。所有16种膜剂含有HPC作为唯一的水溶性、成膜聚合物。16种膜剂的其余组成在表2中显示。从每种膜剂冲压或切出圆盘(约0.35-0.55mm厚;直径约4.8mm)并置于含有作为溶解介质的80ml磷酸缓冲盐水溶液的塑料瓶中。将瓶子加盖并室温下置于往复振荡器中(振荡速度=100rpm)。在每个采样间隔,移取0.5ml溶解介质并立即与0.5ml甲醇混合以稳定药物。溶解介质中药物的量使用HPLC确定。结果在图2中显示(对于R,n=6,对于所有其他膜剂样品,n=3)。
表2
 
膜样品 紫杉醇(μg) 脂肪酸甘油酯的量(HPC重量的%)    脂肪酸甘油酯
C 30 2 Myverol 18-92
D 43 2 Myverol 18-92
E 75 2 Myverol 18-92
F 100 3.5 Myverol 18-92
G 140 3.5 Myverol 18-92
H 65 5 Myverol 18-92
I 93 5 Myverol 18-92
J 100 5 Myverol 18-92
K 140 5 Myverol 18-92
L 75 10 Myverol 18-92
M 65 5 C16:0
N 65 5 C18:1
O 65 5 C16:0 & C18:1
P 65 5 C18:2,C18:1C16:0 & C18:0 
Q 65 5 C18:2,C18:1
R 80 0
C16:0=甘油单棕榈酸酯
C18:0=甘油单硬脂酸酯
C18:1=甘油单油酸酯
C18:2=甘油单亚油酸酯
如图1所示,该简单药物释放模型不能很好地区分不同膜剂样品。例如,具有0%脂肪酸甘油酯的膜剂(样品R)显示的释放曲线约在其他膜剂样品中间。因此开发了更灵敏和更有代表性的方法。
实施例3
制备13种不同紫杉醇膜剂(使用与实施例1中所述相同的方法)并在更灵敏、更有代表性的药物释放模型中评价紫杉醇释放。所有13种膜剂含有HPC作为唯一的水溶性、成膜聚合物。膜剂的其余组成在表3中显示。从每种膜剂冲压或切出圆盘(约0.35-0.55mm厚;直径约4.8mm)并置于分子量截留为12-14,000的分离透析管中。封闭透析管的末端后,将它们置于含有作为溶解介质的80ml磷酸缓冲盐水溶液的塑料瓶中。将瓶子加盖并于室温下置于往复振荡器中(振荡速度=100rpm)。在每个采样间隔,移取0.5ml溶解介质并立即与0.5ml甲醇混合以稳定药物。溶解介质中药物的量使用HPLC确定。结果在图2中显示(对于R,n=6,对于所有其他膜剂样品,n=3)。可以认为该方法更接近代表实际的植入条件,尤其是将本发明的药物递送膜剂植入结膜下或眼球筋膜下位置时。
表3
 
膜样品 紫杉醇(μg) 脂肪酸甘油酯的量(HPC重量的%)    脂肪酸甘油酯
E 75 2 Myverol 18-92
S 80 2.5 Myverol 18-92
T 75 3.5 Myverol 18-92
U 80 3.5 Myverol 18-92
H 65 5 Myverol 18-92
W 70 10 Myverol 18-92
X 80 3.5 C18:2
 
Y 80 3.5 C13:0
Z 80 3.5 C18:2,C18:1C16:0 & C18:0 
M 65 5 C16:0
N 65 5 C18:1
O 65 5 C16:0 & C18:1
R 80 0
C13:0=甘油单十三酸酯
C16:0=甘油单棕榈酸酯
C18:0=甘油单硬脂酸酯
C18:1=甘油单油酸酯
C18:2=甘油单亚油酸酯
此外,在图3中绘制了5个样品(样品H、M、N、O和R)中药物自样品释放的累积量(“累积释放%”)相对时间的曲线。该图比较了含有等量不同脂肪酸甘油酯成分的组合物的药物释放曲线。
图4阐明了脂肪酸甘油酯对释放曲线的影响:脂肪酸甘油酯的浓度越高,药物释放越慢。该图比较了含有不同量的相同脂肪酸甘油酯成分的四种药物递送膜剂组合物(样品E、H、W和R)的药物释放曲线。
本发明已参考一些优选的实施方案进行了描述;然而,应该理解其也可以以其他特定形式或者其变体实施,只要不背离其精神或基本特征即可。因此,此处描述的实施方案在所有方面应认为是阐明性的而非限制性的,本发明的范围由所附权利要求书而不是前述说明书指出。

Claims (15)

1.生物可侵蚀的眼用药物递送膜剂组合物,其包含(i)眼科可接受的药物,(ii)25-99.5%重量/重量的水溶性成膜聚合物,选自羟丙基纤维素、聚乙烯醇、聚丙烯酸、羟丙甲基纤维素、羧甲基纤维素和羟乙基纤维素,和(iii)分子量为150-4000的脂肪酸甘油酯或脂肪酸酯,其中脂肪酸甘油酯或脂肪酸酯的量等于水溶性成膜聚合物重量的0.5-25%,且其中脂肪酸甘油酯或脂肪酸酯具有下式:
Figure C03816792C00021
其中:
R1、R2和R3独立地为-H、-OH、-COOH、-CnH2n+1-2m、-OOCCnH2n+1-2m、-COOCnH2n+1-2m、-COO(CH2CH2O)nCH2CH2OH、-CnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OCnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OOCCnH2n+1-2mCOOCn’H2n’+1-2m’
条件是,R1、R2和R3中的至少一个选自-OOCCnH2n+1-2m、-COOCnH2n+1-2m、-COO(CH2CH2O)nCH2CH2OH、-CnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OCnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OOCCnH2n+1-2mCOOCn’H2n’+1-2m’
n和n’独立地为0-50;且
m和m’独立地为0-10。
2.权利要求1的膜剂组合物,其中的水溶性成膜聚合物选自羟丙基纤维素、聚乙烯醇和羧甲基纤维素。
3.权利要求2的膜剂组合物,其中的水溶性成膜聚合物为羟丙基纤维素。
4.权利要求1的膜剂组合物,其中该膜剂组合物由(i)眼科可接受的药物、(ii)水溶性成膜聚合物和(iii)脂肪酸甘油酯或脂肪酸酯组成。
5.权利要求1的膜剂组合物,其中:
R1、R2和R3独立地为-H、-OH、-COOH、-CnH2n+1-2m或-OOCCnH2n+1-2m
条件是,R1、R2和R3中的至少一个选自-OOCCnH2n+1-2m
n和n’独立地为0-25;且
m和m’独立地为0-3。
6.权利要求1的膜剂组合物,其中该组合物包含熔点≤46℃的单一的式(I)脂肪酸甘油酯或式(I)脂肪酸甘油酯的混合物。
7.权利要求1的膜剂组合物,其中该组合物包含熔点≤42℃的单一的式(I)脂肪酸甘油酯或式(I)脂肪酸甘油酯的混合物。
8.权利要求1的膜剂组合物,其中该膜剂组合物包含的脂肪酸甘油酯或脂肪酸酯的量等于水溶性成膜聚合物重量的1-10%。
9.权利要求8的膜剂组合物,其中该膜剂组合物包含的脂肪酸甘油酯或脂肪酸酯的量等于水溶性成膜聚合物重量的3-5%。
10.权利要求1的膜剂组合物,其中该膜剂组合物包含0.0001-25%重量/重量眼科上可接受的药物。
11.权利要求10的膜剂组合物,其中该膜剂组合物包含0.5-1%重量/重量眼科上可接受的药物且该眼科上可接受的药物是紫杉醇。
12.权利要求1的膜剂组合物,其中该膜剂组合物还包含选自表面活性剂、螯合剂和抗氧化剂的赋形剂。
13.生物可侵蚀的眼用药物递送膜剂组合物在制备用于治疗眼科疾病的药物中的用途,其中该膜剂组合物包含(i)眼科可接受的药物、(ii)25-99.5%重量/重量的水溶性成膜聚合物,选自羟丙基纤维素、聚乙烯醇、聚丙烯酸、羟丙甲基纤维素、羧甲基纤维素和羟乙基纤维素,和(iii)分子量为150-4000的脂肪酸甘油酯或脂肪酸酯,其中脂肪酸甘油酯或脂肪酸酯的量等于水溶性成膜聚合物重量的0.5-25%,且其中脂肪酸甘油酯或脂肪酸酯具有下式:
Figure C03816792C00041
其中:
R1、R2和R3独立地为-H、-OH、-COOH、-CnH2n+1-2m、-OOCCnH2n+1-2m、-COOCnH2n+1-2m、-COO(CH2CH2O)nCH2CH2OH、-CnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OOCCnH2n+1-2mCOOCn’H2n’+1-2m’
条件是,R1、R2和R3中的至少一个选自-OOCCnH2n+1-2m、-COOCnH2n+1-2m、-COO(CH2CH2O)nCH2CH2OH、-CnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OCnH2n+1-2mCOO(CH2CH2O)nCH2CH2OH、-OOCCnH2n+1-2mCOOCn’H2n’+1-2m’
n和n’独立地为0-50;且
m和m’独立地为0-10。
14.权利要求13的用途,其中膜剂组合物作为结膜下或眼球筋膜下植入物放入眼中。
15.权利要求13的用途,其中眼科可接受的药物是抗增殖药物且药物递送膜剂组合物与青光眼滤过手术连同使用。
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