Comparative expression of proteins in left and right atrial appendages from patients with mitral valve disease at sinus rhythm and atrial fibrillation.
BACKGROUND
The objective was to compare by proteomics the expression of proteins associated with the cytoskeleton, energetic metabolism, and cardiac cytoprotection between left atrial appendages (LAA) and right atrial appendages (RAA) obtained from patients with mitral valve disease both in sinus rhythm (SR, n = 6) and in permanent atrial fibrillation (AF, n = 11).


RESULTS
Samples from RAA and LAA were obtained from the same patient. Proteins were separated in 2-dimensional electrophoresis and identified by mass spectrometry. LAA from SR patients upexpressed alpha-actin isotype 1 and desmin isotypes 3 and 5 with respect to RAA. In LAA from AF patients were upexpressed cardiac alpha-actin isotypes 1 and 2, tropomyosin alpha- and beta-chains, and myosin light chain embryonic muscle/atrial isoform with respect to LAA from SR patients. In RAA from AF patients also upexpressed different cytoskeleton associated proteins with respect to RAA from SR patients. Different energetic metabolism-associated proteins were upexpressed in LAA and RAA from AF with respect those from SR patients. In AF patients, the expression of proteins associated with cardiac cytoprotection such as gluthatione-S-transferase, heat shock protein (Hsp) 27, and different Hsp60 isotypes, were higher in RAA but not in LAA with respect to the corresponding appendages in SR patients.


CONCLUSIONS
For each individual patient RAA and LAA showed a similar level of proteins expressed associated with cytoskeleton, energetic metabolism, and cardiac cytoprotection. There were more differences in the level of proteins associated with the above-mentioned mechanisms between the atrial appendages from AF with respect to SR patients, which may open new targets for drugs.
Cardiovascular Research Unit, Hospital Clínico San Carlos, Madrid, Spain.
Javier
J
Modrego
Luis
L
Maroto
Juan
J
Tamargo
Luis
L
Azcona
Petra
P
Mateos-Cáceres
Antonio
A
Segura
Rosario
R
Moreno-Herrero
Nicasio
N
Pérez-Castellanos
Eva
E
Delpón
Julián
J
Pérez-Villacastín
Enrique
E
Rodríguez
Carlos
C
Macaya
Antonio J
AJ
López-Farré
D000367:Age Factors; D000368:Aged; D020517:Atrial Appendage / Q000737:chemistry* / Q000473:pathology; D001281:Atrial Fibrillation / Q000209:etiology / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology / Q000517:prevention & control; D003598:Cytoskeletal Proteins / Q000032:analysis*; D015180:Electrophoresis, Gel, Two-Dimensional; D004734:Energy Metabolism; D006801:Humans; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000150:complications / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D009124:Muscle Proteins / Q000032:analysis*; D010449:Peptide Mapping; D040901:Proteomics / Q000379:methods; D013030:Spain; D053719:Tandem Mass Spectrometry
D003598:Cytoskeletal Proteins; D009124:Muscle Proteins