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Journal of Cell Science, Vol 109, Issue 13 2989-2999, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
R Fassler, J Rohwedel, V Maltsev, W Bloch, S Lentini, K Guan, D Gullberg, J Hescheler, K Addicks and AM Wobus
Max-Planck-Institute of Biochemistry, Martinsried, Germany.
Cellular interactions with substrata of the microenvironment are one of the major mechanisms for differentiation and morphogenesis. Many of these interactions are mediated via the beta 1 integrin subfamily of cell surface receptors, which are believed to transduce signals upon cell adhesion. We have used beta 1 integrin-deficient embryonic stem cells to test their ability to differentiate into cardiac muscle cells. We show here by several approaches that beta 1 integrin is important for normal cardiogenesis. First, the in vitro differentiation of beta 1 integrin-deficient embryonic stem cells into cardiac muscle cells is retarded. This is demonstrated by the delayed expression of cardiac muscle-specific genes and action potentials. Second, the specification of cardiac precursor cells into pacemaker-, atrial- and ventricular-like cells is significantly impaired in beta 1 integrin-deficient cells. The occurrence of atrial- and ventricular-like cells is reduced and transient. Only cells exhibiting peacemaker-like action potentials of high frequency and arrhythmias survive. Third, the sarcomeric architecture is incomplete and disarranged in the absence of beta 1 integrin. Fourth, beta 1-deficient embryonic stem cells can contribute to the developing heart in chimaeric mice but many areas with beta 1-null cells contain cell debris. The number of beta 1-null cells decrease from prenatal to postnatal stages and is lost completely in 6-month-old hearts. Thus, we conclude that interactions with the extracellular matrix via beta 1 integrin is necessary for differentiation and the maintenance of a specialized phenotype of cardiac muscle cells.
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