CN110404050A - 卡贝缩宫素注射液的制备工艺 - Google Patents
卡贝缩宫素注射液的制备工艺 Download PDFInfo
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Abstract
本发明属于氨基酸技术领域,公开了卡贝缩宫素注射液的制备工艺,其特征在于,所述制备工艺包括如下步骤:取卡贝缩宫素100μg,氯化钠9mg,冰醋酸调节pH值至4.0±0.2,注射用水加至1ml。本发明工艺制备的产品半衰期延长,稳定性提升,可用于治疗或预防子宫张力缺失,和/或用于治疗或预防经阴道分娩后的过度出血。
Description
技术领域
本发明属于氨基酸技术领域,具体涉及卡贝缩宫素注射液的制备工艺。
背景技术
卡贝缩宫素由加拿大辉凌制药有限公司研制开发,是一种人工合成的具有激动剂性质的长效催产素九肽类似物。
中文名称:卡贝缩宫素
中文拼音名:kabeisuogongsu
英文名称:Carbetocin
CAS号:37025-55-1
氨基酸序列:
分子式:C45H69N11O12S
分子量:988.16
化学名称:去氨-2-氧-甲基酪氨酸-1-κ缩宫素
卡贝缩宫素用于选择性硬膜外或腰麻下剖腹产手术后,以及预防子宫收缩乏力和产后出血,其起效快、作用时间长、临床应用安全有效。目前,国外上市的有法国和加拿大。其中加拿大的辉凌制药(Ferring Inc.)于2007年最先上市,2009年在中国上市,其剂型为注射剂,商品名:巧特欣,英文商品名:Duratocin;另外,法国的Polypeptide LaborariesFrance 公司于2011年批准上市原料药。成都圣诺生物制药有限公司国内首仿、具有自主知识产权的“卡贝缩宫素注射液”及原料药,于2016年获得国家批准上市。翰宇药业于2016年研发上市的翰宝®卡贝缩宫素,同时,翰宇药业的翰宝®卡贝缩宫素还通过了美国FDA及欧盟认证。
子宫收缩的动因来源于内源性催产素和前列腺素的释放。细胞内游离钙离子是肌肉兴奋-收缩耦联的活化剂,催产素可以释放和促进钙离子向肌细胞内流动,而前列腺素是钙离子载体,与钙离子形成复合体,将钙离子携带进入细胞内。进入肌细胞内的钙离子与肌动蛋白、肌浆蛋白结合引起子宫收缩与修复,对宫壁上的血管起压迫止血的作用。同时,由于肌肉修复使血管迂回曲折,血流阻滞,有利于血栓形成,血窦关闭。但是子宫肌纤维收缩后还会放松,因而根本的止血机制是血液凝固。妊娠期血液处于高凝状态,在内源性前列腺素的作用下血小板大量聚集,聚集的血小板释放血管活性物质,加强血管收缩,同时引起粘性变形,形成血栓,导致凝血因子的大量释放,进一步发生凝血反应,形成的凝血块可以有效堵塞胎盘剥离面暴露的血管达到自然止血的目的。
缩宫素是机体产生的物质,其在体内很快被胎盘产生的缩宫素酶及肝、肾、肠所灭活及清除,体内半衰期仅3-4min,第三产程结束时缩宫素体内的作用已近消失。缩宫素仅能刺激子宫上段收缩,当受体位点饱和后增加药物剂量不起收缩作用,而且大剂量的缩宫素可导致水中毒。
卡贝缩宫素是在缩宫素的基础上进行的改进,是缩宫素结构修饰后得到的:(1)去氨基化,丁酰基取代了缩宫素的1位Cys;(2) 去二硫键化,丁酰基的4位与缩宫素6位Cys的巯基形成硫醚键;(3) Tyr的羟基甲基化。上述修饰可以使得卡贝缩宫素减轻酶和二硫化合物的降解,提高稳定性。尽管二者分子结构存在差异,但是其结合子宫肌层内膜受体的亲和力一样,由于结构的修饰,使得卡贝缩宫素的代谢稳定性比缩宫素要强,人体肌肉注射卡贝缩宫素后,2min左右,子宫有一个明确地收缩,持续时间为40-60min。
卡贝缩宫素的临床和药理特性与天然产生的催产素类似,与子宫平滑肌的催产素受体结合,引起子宫的节律性收缩,在原有的收缩基础上,增加其频率和增加子宫张力。在非妊娠状态下,子宫的催产素受体含量很低,在妊娠期间增加,分娩时达高峰。因此,卡贝缩宫素对非妊娠状态的子宫没有作用,但是对妊娠的子宫和刚生产的子宫具有有效的收缩作用。考虑到卡贝缩宫素产品的单一性,而且现有技术存在一定数量患者需要较长时间的辅助宫缩和止血,需要开发多元化的产品,来适应临床患者的需求。
发明内容
为了克服现有技术的缺陷,本发明提供了新的卡贝缩宫素类化合物,进一步开发了卡贝缩宫素注射液的制备工艺。
本发明是通过如下技术方案来实现的。
一种注射液,其包括半衰期延长的卡贝缩宫素和药物学上可接受的辅料。
进一步地,所述卡贝缩宫素的氨基酸序列如下:
进一步地,所述注射液的组成为:卡贝缩宫素100μg,氯化钠9mg,冰醋酸调节pH值至4.0±0.2,注射用水加至1ml。
进一步地,所述注射液,其用于治疗或预防子宫张力缺失,和/或用于治疗或预防经阴道分娩后的过度出血。
优选地,所述子宫张力缺失包括:在婴儿经阴道分娩后、婴儿通过剖腹生产术分娩后的子宫张力缺失。
与现有技术相比,本发明具有如下但是并不限于以下几个方面的优点:
本发明卡贝缩宫素在现有产品的基础上进行了改进,通过将N末端Gly替换为[D-Arg],然后进行乙酰化,从而降低蛋白酶的水解,增加半衰期,提高稳定性,旨在与现有技术上市的卡贝缩宫素形成互补;血清中代谢半衰期为现有技术上市的卡贝缩宫素的有所提升,生物活性差异并不大。
化学结构修饰大大提高了肽类药物的抗蛋白酶降解能力,明显延长了半衰期,提高了生物利用度,但是仍存在一定的局限和不足,例如大分子聚合物的缀合易导致药物活性有一定程度的降低;更深入的研究仍在进行中。本发明处于药品研发的前期阶段,需要对后续的制剂开发、药理毒理、药动学以及临床应用进行进一步系统地研究。
具体实施方式
为了使本技术领域的人员更好地理解本申请中的技术方案,下面将结合本申请具体实施例,对本申请的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都应当属于本发明保护的范围。
实施例1
本发明卡贝缩宫素,其氨基酸序列如下:
将N末端的Gly替换 [D-Arg]-NH-,然后进行乙酰化;参见现有技术常规的合成卡贝缩宫素的方法来合成本发明的氨基酸序列,然后进行乙酰化制备得到。
效价为8.26IU/mg(中国药典2010 年版二部,采用大鼠子宫平滑肌生物测定法测定缩宫素的生物效价),和巧特欣(市售产品)有所降低,但是差异不大。
将上述卡贝缩宫素制备成注射液,具体如下:
该药品剂型为注射液;处方组成为卡贝缩宫素100μg,氯化钠9mg,冰醋酸调节pH值至4.0±0.2,注射用水加至1ml。
剂型:注射液;
规格:100μg/ml/支;
内包装:中硼硅安瓿。
本品系人工合成的卡贝缩宫素灭菌溶液,每1ml含卡贝缩宫素应为0.090-0.110mg;2-8℃保存,不能冻存,有效期2年。
实施例2
急性毒性试验
20只大鼠每天静脉注射剂量为1mg/kg,28d后均没有发现与治疗有关的死亡或临床现象,血液学、临床生化以及尿液分析也没有出现与治疗相关的变化。
实施例3
稳定性试验
试验流程参照“KRAJNICAKOVA M.等,Spofa in early puerperium,36(10)
707-618,1991”;在山羊中的半衰期为34.6min,比市售卡贝缩宫素延长了10min以上;在猪中的半衰期为126.4min,比市售卡贝缩宫素延长了20min以上。
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以对本发明进行若干改进和修饰,这些改进和修饰也落入本发明权利要求的保护范围内。
Claims (5)
1.卡贝缩宫素注射液的制备工艺,其特征在于,所述制备工艺包括如下步骤:取卡贝缩宫素100μg、氯化钠9mg,用冰醋酸调节pH值至4.0±0.2,注射用水加至1ml,即得。
2.根据权利要求1所述的制备工艺,其特征在于,所述卡贝缩宫素的氨基酸序列如下:
。
3.按照权利要求1-2所述的制备工艺制备的注射液。
4.根据权利要求3所述的注射液,其用于治疗或预防子宫张力缺失,和/或用于治疗或预防经阴道分娩后的过度出血。
5.根据权利要求4所述的注射液,所述子宫张力缺失包括:在婴儿经阴道分娩后、婴儿通过剖腹生产术分娩后的子宫张力缺失。
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