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Evaluation of two carrier protein–angiotensin I conjugate vaccines to assess their future potential to control high blood pressure (hypertension) in man
Author(s) -
Downham M. R.,
Auton T. R.,
Rosul A.,
Sharp H. L.,
Sjöström L.,
Rushton A.,
Richards J. P.,
Mant T. G. K.,
Gardiner S. M.,
Bennett T.,
Glover J. F.
Publication year - 2003
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1046/j.1365-2125.2003.01926.x
Subject(s) - toxoid , medicine , conjugate , keyhole limpet hemocyanin , angiotensin ii , immunization , immune system , tetanus , conjugate vaccine , immunology , antigen , renin–angiotensin system , pharmacology , blood pressure , vaccination , endocrinology , mathematical analysis , mathematics
Aims We aim to modulate the renin–angiotensin system (RAS) by active immunization against angiotensin I hormone (AI), potentially providing a novel conjugate vaccine treatment for hypertension in man. Methods Immunization studies in rat and human subjects compare the effectiveness of tetanus toxoid (TT) and keyhole limpet haemocyanin (KLH) vaccines for immunotherapy following conjugation with an AI peptide analogue ( AI ). Cardiovascular responses were assessed in immunized rats and human subjects (two‐dose trial only), following increasing i.v. infusions of either AI or angiotensin II hormone (AII). Results The AI –TT and AI –KLH conjugate vaccines induced an equivalent immune response, and inhibition of the pressor effects to exogenous AI in rats. Single‐dose clinical trials with both conjugate vaccines only resulted in an immune response to the KLH carrier protein. A two‐dose clinical trial of AI –KLH conjugate vaccine resulted in a significant immune response to AI . A shift in diastolic blood pressure (DBP) dose–response was demonstrated following challenge with AI and AII for the study volunteer showing the largest anti‐ AI IgG induction. Conclusion KLH was shown to be a suitable alternative to TT as a carrier protein for AI , thus supporting continued evaluation of our AI –KLH conjugate vaccine for treatment of hypertension in man.