We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Induction of initial cardiomyocyte a-actinsmooth muscle a-actinin cultured avian pregastrula epiblast: A role for nodal and BMP antagonist.
- Authors
Hiroko Matsui; Kazuo Ikeda; Kazuki Nakatani; Masahide Sakabe; Toshiyuki Yamagishi; Toshio Nakanishi; Yuji Nakajima
- Abstract
During early cardiogenesis, endoderm-derived bone morphogenetic protein (BMP) induces the expression of both heart-specific transcription factors and sarcomeric proteins. However, BMP antagonists do not inhibit the expression of the initial heart a-actinsmooth muscle a-actin (SMA)which is first expressed in the anterior lateral mesoderm and then recruited into the initial myofibrils (Nakajima et al. [2002] Dev. Biol. 245:291303). Therefore, mechanisms that regulate the expression of SMA in the heart-forming mesoderm are not well-understood. Regional explantation experiments using chick blastoderm showed that the posterolateral region of the epiblast differentiated into cardiomyocytes. Posterior epiblast cultured with or without the associated hypoblast showed that interaction between the tissues of these two germ layers at the early pregastrula stage (stages XXI) was a prerequisite for the expression of SMA. Posterior epiblast that is cultured without hypoblast could also be induced to express SMA if TGF- or activin was added to the culture medium. However, neither neutralizing antibodies against TGF-s nor follistatin perturbed the expression of SMA in cultured blastoderm. Adding BMP to the cultured blastoderm inhibited the expression of SMA, whereas BMP antagonists, such as chordin, were able to induce the expression of SMA in cultured posterior epiblast. Furthermore, adding lefty-1, a nodal antagonist, to the blastoderm inhibited the expression of SMA, and nodal plus BMP antagonist up-regulated the expression of SMA in cultured posterior epiblast. Results indicate that the interaction between the tissues of the posterior epiblast and hypoblast is necessary to initiate the expression of SMA during early cardiogenesis and that nodal and BMP antagonist may play an important role in the regulation of SMA expression. Developmental Dynamics 233:14191429, 2005. 2005 Wiley-Liss, Inc.
- Subjects
EMBRYONIC stem cells; PROTEINS; GROWTH factors; TRANSCRIPTION factors
- Publication
Developmental Dynamics, 2005, Vol 233, Issue 4, p1419
- ISSN
1058-8388
- Publication type
Article
- DOI
10.1002/dvdy.20477