Document Detail


Hypotension with intravenous immunoglobulin therapy: importance of pH and dimer formation.
MedLine Citation:
PMID:  14624798     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Therapy with intravenous immunoglobulin preparations has been used effectively in a wide range of conditions. Although generally well tolerated, intravenous immunoglobulin preparations may be associated with transient hypotension in some patients. This study examined the role of different immunoglobulin G fractions in the development of intravenous immunoglobulin-induced hypotension in an anaesthetized rat model and assessed the effects of a new liquid immunoglobulin prepared at a low pH on both the formation of immunoglobulin G dimers and the development of hypotension. The effects of this new preparation in an experimental autoimmune encephalomyelitis model were also evaluated. Results from the haemodynamic studies indicated that immunoglobulin G dimers in polyclonal immunoglobulin G are responsible for the hypotensive events associated with some immunoglobulin preparations. They also showed that adjustment to an acidic pH results in the rapid dissociation of immunoglobulin G dimers and prevents the development of hypotension. Additional experiments demonstrated that only immunoglobulin G dimers with a functional Fc fragment can bind to Fcgamma receptors on macrophages to induce the release of blood pressure-lowering mediators. Moreover, essentially monomeric Fc fragments can block the blood pressure-lowering effects of immunoglobulin G dimers. Preparation of a new liquid intravenous immunoglobulin with the pH adjusted to 4.3 prevents the formation of immunoglobulin G dimers even over long-term storage and does not significantly affect blood pressure in a rat model. This preparation is as effective as other intravenous immunoglobulin preparations in ameliorating symptoms of experimental autoimmune encephalomyelitis. These results, like those from previous studies, indicate that preparation of intravenous immunoglobulin at a low pH substantially reduces immunoglobulin G dimerization; this effect significantly decreases the potential for intravenous immunoglobulin to induce hypotension without reducing its clinically relevant biological activity.
Authors:
Monika Kroez; Ernst Jürgen Kanzy; Peter Gronski; Gerhard Dickneite
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biologicals : journal of the International Association of Biological Standardization     Volume:  31     ISSN:  1045-1056     ISO Abbreviation:  Biologicals     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-11-19     Completed Date:  2004-08-16     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  9004494     Medline TA:  Biologicals     Country:  England    
Other Details:
Languages:  eng     Pagination:  277-86     Citation Subset:  IM    
Affiliation:
Aventis Behring GmbH, Emil von Behring Strasse 76, 35041, Marburg, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Antibodies, Anti-Idiotypic / chemistry
Biological Products / chemistry,  isolation & purification,  toxicity
Blood Pressure / drug effects
Dimerization
Encephalomyelitis, Autoimmune, Experimental / physiopathology,  therapy
Female
Humans
Hydrogen-Ion Concentration
Hypotension / etiology*,  immunology,  prevention & control
Immunoglobulin Fc Fragments / chemistry
Immunoglobulin Idiotypes / chemistry
Immunoglobulins, Intravenous / chemistry,  isolation & purification,  toxicity*
Rats
Rats, Inbred Lew
Rats, Sprague-Dawley
Chemical
Reg. No./Substance:
0/Antibodies, Anti-Idiotypic; 0/Biological Products; 0/Immunoglobulin Fc Fragments; 0/Immunoglobulin Idiotypes; 0/Immunoglobulins, Intravenous

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