Changes in the arrangement of actin bundles during heart looping in the chick embryo

N Itasaki, H Nakamura, M Yasuda

Research output: Contribution to journalArticle (Academic Journal)peer-review

44 Citations (Scopus)

Abstract

We assessed the arrangement of actin bundles in the looping chick heart. Actin filaments were stained with rhodamine-labeled phalloidin, and their total arrangement was observed in whole mount specimens. Before the straight heart tube was formed, actin bundles were in a net-like arrangement as if to indicate the cell borders. With progress of the heart tube formation, actin bundles were gradually arranged in a circumferential direction. In the looped heart, regional differences in actin arrangements were observed. In the truncus arteriosus, actin bundles ran in a net-like arrangement. In the bulbus cordis, actin bundles ran in random directions. In the ventricle, actin bundles were roughly arranged in a circumferential direction. Between these three regions, actin bundles ran in a circumferential direction especially on the concave side. Near the right contour on the ventral face, some actin bundles ran in a longitudinal direction along the axis of the tubular heart. In the bulbus cordis and the ventricle at the looped stage, there was another group of actin bundles in the inner layer of the myocardium which ran in a circumferential direction. We presume that the arrangement of actin bundles is related to heart looping.

Original languageEnglish
Pages (from-to)413-420
Number of pages8
JournalAnatomy and Embryology
Volume180
Issue number5
DOIs
Publication statusPublished - Oct 1989

Keywords

  • Actin Cytoskeleton
  • Actins
  • Animals
  • Chick Embryo
  • Cytoskeleton
  • Heart
  • Microscopy, Fluorescence
  • Morphogenesis

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