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Increased β‐Myosin Heavy Chain in Acute Cellular Rejection Following Human Heart Transplantation
Author(s) -
Yamani Mohamad H.,
Kinter Michael T.,
Starling Randall C.,
Willard Belinda B.,
Ratliff Norman B.,
Yu Yang,
Cook Daniel J.,
McCarthy Patrick M.,
Young James B.
Publication year - 2002
Publication title -
american journal of transplantation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 188
eISSN - 1600-6143
pISSN - 1600-6135
DOI - 10.1034/j.1600-6143.2002.20416.x
Subject(s) - myosin , immunoglobulin light chain , myosin light chain kinase , transplantation , medicine , two dimensional gel electrophoresis , protein expression , heart transplantation , microbiology and biotechnology , gel electrophoresis , beta (programming language) , heavy chain , immunohistochemistry , pathology , biology , immunology , antibody , proteomics , biochemistry , gene , computer science , programming language
Background: Increased expression of smooth muscle and nonmuscle myosin heavy chains has been previously reported in animal models of cardiac allograft rejection. However, altered expression of β‐myosin heavy chain in human cardiac rejection has not been determined. Methods: Two‐dimensional (2D)‐gel electrophoresis of endomyocardial biopsies taken from patients with (Grade 3A, n = 6) and without (Grade 0, n = 6) acute rejection were analyzed. Increased expression of two protein spots (MW ∼ 12 kDa) were identified in the presence of acute rejection and were further characterized by mass spectrometry analysis. In patients who had acute rejection, protein expression was subsequently analyzed by immunoblotting on biopsies preceding, during, and following treatment of rejection. Results: Mass spectrometric analysis of the protein spots detected 6 and 22 tryptic peptides, respectively. Protein sequence database search analysis identified the first protein as β‐myosin heavy chain and the second spot consisted of proteins of unidentified nature that may represent novel proteins. Immunoblotting analysis showed 1.4 × fold increase (p < 0.01) of protein expression of β‐myosin heavy chain expression in the presence of acute rejection. Conclusions: To our knowledge, this is the first 2D‐gel study to describe increased expression of β‐myosin heavy chain and other proteins of unidentified nature in association with human cardiac allograft rejection.