
The Lancet:高血压疫苗有望五年内上市
在不久的将来,一些高血压患者可能只需注射疫苗,就能有效控制血压。该治疗型疫苗是瑞士一家制药企业多年研发的结果。目前,疫苗还处于小范围临床试验,有48位高血压患者已经完成了一个注射疗程,预期降压效果能维持4个月左右。据悉,疫苗将于五年内上市,相关研究结果已发表于英国著名医学杂志《柳叶刀》(The Lancet)上。
高血压疫苗主要作用于血管紧张素系统,注入体内时,疫苗就会“感染”患者,刺激免疫系统生成血管紧张素抗体,抑制血管紧张素,从而把血压降下来。
疫苗研发人员认为,与传统口服降压药物相比,高血压疫苗具有多方面优势。第一,口服降压药物半衰期短,无法稳定控制清晨血压,而此时正是中风和心梗的高发时段;高血压疫苗就无此担忧,试验证实,疫苗能保证患者凌晨血压显著下降。第二,疫苗每年只需注射三次,避免了每天定点服药的麻烦,依从性明显优于口服药。第三,如今有些高血压口服药也是依据血管紧张素的原理治疗,但不少患者觉得降压效果不明显而自行停服。还有患者服用后不良反应较大。而高血压疫苗不良反应小,只有一些类似流感的症状,患者更易接受。
“高血压疫苗为高血压研究提供了新的视角。2007年,英国也有一家制药企业宣布,利用血管紧张素原理研制出疫苗,并进入2期临床。”卫生部中日友好医院大内科及心内科主任柯元南教授在接受《生命时报》记者采访时说,“但这种疫苗也有缺陷,不能解决所有问题,对部分患者来说并不适用。”高血压发病机制有很多种,肾素血管紧张素活性高只是一种机制,针对该系统的疫苗对其他作用机制引发的高血压效果可能不会太好。因此,很多患者并不能从中受益。
柯元南指出,不论英国还是瑞士研发的疫苗,离大规模临床试验都有一段距离,何时能通过批准上市尚未可知,进入中国则可能是六七年后的事了。(来源:人民网-生命时报)
生物谷推荐原始出处:
(The Lancet),doi:10.1016/S0140-6736(08)60381-5,Alain C Tissot, Martin F Bachmann)
Effect of immunisation against angiotensin II with CYT006-AngQb on ambulatory blood pressure: a double-blind, randomised, placebo-controlled phase IIa study
Alain C Tissot PhDa, Patrik Maurer PhDa, Prof Juerg Nussberger MDb, Robert Sabat MDc, Thomas Pfister PhDa, Stanislav Ignatenko MDd, Prof Hans-Dieter Volk MDe, Hans Stocker PhDa, Philipp Müller MDa, Gary T Jennings PhDa, Frank Wagner MDf and Martin F Bachmann PhDa,
,
aCytos Biotechnology AG, Zurich-Schlieren, Switzerland
bDivision of Angiology and Hypertension, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
cInterdisciplinary Group of Molecular Immunopathology, Dermatology/Medical Immunology, Charité, Berlin, Germany
dParexel GmbH, Hennigsdorf/Berlin, Germany
eInstitute of Medical Immunology and Berlin-Brandenburg Centre for Regenerative Therapies, Charité University Medicine Berlin, Berlin, Germany
fCh
Summary
Background
Hypertension can be controlled adequately with existing drugs such as angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers. Nevertheless, treatment success is often restricted by patients not adhering to treatment. Immunisation against angiotensin II could solve this problem. We investigated the safety and efficacy of CYT006-AngQb—a vaccine based on a virus-like particle—that targets angiotensin II to reduce ambulatory blood pressure.
Methods
In this multicentre, double-blind, randomised, placebo-controlled phase IIa trial, 72 patients with mild-to-moderate hypertension were randomly assigned with a computer-generated randomisation list to receive subcutaneous injections of either 100 μg CYT006-AngQb (n=24), 300 μg CYT006-AngQb (24), or placebo (24), at weeks 0, 4, and 12. 24-h
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