Molecular mechanisms of myofibril assembly in heart.

Abstract:

:We investigated the assembly of the first sarcomeres in chicken embryos by confocal microscopy of immunofluorescently stained whole mount rudiments of early chicken hearts isolated around the onset of beating. In embryos with merely 9 somites, myomesin was found to be present in a cross striated pattern, indicating that myomesin is expressed rather early during development. RNA studies confirmed these findings and RT-PCR revealed the presence of myomesin mRNA already in the 7 somite embryo. The expression of myomesin mRNA coding for the skeletal isoform preceded the heart specific transcript. In the adult heart, however, only the heart isoform was detectable. The interaction of myomesin domains with the sarcomere was investigated by transfection of epitope tagged constructs into cultured cardiomyocytes. The second domain of myomesin, an immunoglobulin-like domain, was found to specifically bind to the M-band region of chicken cardiomyocytes. All constructs containing this domain also showed M-band localization. Additionally, constructs consisting of either the second domain of myomesin or the myosin light chain isoform MLC 3f fused to the green fluorescent protein (eGFP) were expressed in rat cardiomyocytes and were found to be distributed in the same manner as the expression constructs tagged only with the much shorter VSV epitope. Transfected cells did not show any alteration in beating activity and no alteration of myofibrillar structure, as judged by simultaneous staining for the Z-disc protein alpha-actinin and other sarcomeric markers. Apparently, the addition of eGFP did not disturb the assembly properties or the function of the two proteins and therefore allowed the easy visualization of assembly and contraction processes directly in the living cardiomyocyte.

journal_name

Cell Struct Funct

authors

Auerbach D,Rothen-Ruthishauser B,Bantle S,Leu M,Ehler E,Helfman D,Perriard JC

doi

10.1247/csf.22.139

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

139-46

issue

1

eissn

0386-7196

issn

1347-3700

journal_volume

22

pub_type

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