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Peptides derived from cardiovascular G-protein-coupled receptors induce morphological cardiomyopathic changes in immunized rabbits.

Artikel i vetenskaplig tidskrift
Författare S Matsui
Michael Fu
S Katsuda
M Hayase
N Yamaguchi
K Teraoka
T Kurihara
N Takekoshi
E Murakami
Johan Hoebeke
Åke Hjalmarson
Publicerad i Journal of molecular and cellular cardiology
Volym 29
Nummer/häfte 2
Sidor 641-55
ISSN 0022-2828
Publiceringsår 1997
Publicerad vid Wallenberglaboratoriet
Institutionen för invärtesmedicin
Sidor 641-55
Språk en
Länkar dx.doi.org/10.1006/jmcc.1996.0307
Ämnesord Amino Acid Sequence, Animals, Autoimmunity, Body Weight, Cardiomyopathies, immunology, mortality, pathology, Cross Reactions, Enzyme-Linked Immunosorbent Assay, Epitopes, GTP-Binding Proteins, metabolism, Heart, anatomy & histology, Immune Sera, Immunization, methods, Male, Microscopy, methods, Microscopy, Electron, Molecular Sequence Data, Myocardium, immunology, pathology, Organ Size, Peptide Fragments, immunology, pharmacology, Rabbits, Receptor, Muscarinic M2, Receptors, Adrenergic, beta-1, immunology, metabolism, Receptors, Muscarinic, immunology, metabolism
Ämneskategorier Fysiologi, Cell- och molekylärbiologi, Mikrobiologi inom det medicinska området

Sammanfattning

An experimental model of early-stage cardiomyopathy was created by immunizing rabbits for 1 year with synthetic peptides corresponding to the sequence of the second extracellular loop of either beta-adrenoceptors or M2-muscarinic receptors. Thirty male rabbits were used and divided into three groups: a control group (n = 10), a group immunized with the peptide corresponding to the beta-adrenoceptor (beta 1 group) (n = 10) and a group immunized with the peptide corresponding to the M2-muscarinic receptor (M2 group) (n = 10). If the sera from both groups of immunized rabbits high-titres of anti-peptide antibodies were found throughout the study period but not in the sera from control rabbits or in the preimmune sera of immunized rabbits. No significant cross-reaction with peptides other than those used for immunization was found. The myocardial receptor density of both immunized groups displayed a strong trend toward receptor up-regulation. This was significant in the beta 1 group but not in the M2 group. Both groups of immunized rabbits displayed significantly enlarged ventricles and thinner walls, as compared with the control group. However, in contrast to the beta 1 group, which showed enlarged cavities in both left and right ventricles, the M2 group was mainly affected in the right ventricles. Moreover, morphological examinations of the hearts of rabbits from both immunized groups demonstrated focal myofibrillar lysis, loss of myofilament, mitochondrial swelling and condensation, sarcoplasmic vacuolation, deposition of dense granules in the sarcoplasm and the myofibrils. One of the sex control rabbit hearts which were examined showed mild degenerative changes in the myocardium and scant mononuclear cell infiltration. However, when all the control rabbit hearts were examined by electron microscopy, no significant alterations were found. These results suggest that immunization by peptides, corresponding to the target sequences for anti-receptor autoantibodies in idiopathic dilated cardiomyopathy, induces morphological changes in the heart similar to those found in the human disease.

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