title: Changes in the fluctuation of the contraction rhythm of spontaneously beating cardiac myocytes in cultures with and without cardiac fibroblasts.
abstract: The heart functions as a syncytium of cardiac myocytes and surrounding supportive non-myocytes such as fibroblasts. There is a possibility that a variety of non-myocyte-derived factors affect the maturation of cardiac myocytes in the development of the heart. Cultured neonatal cardiac myocytes contract spontaneously and cyclically. The fluctuation of beating rhythm varies depending on the strength of coupling through gap junctions among cardiac myocytes, indicating that the development of intercellular communication via gap junctions is crucial to the stability of contraction rhythm in cardiac myocytes. In this study, we aimed at elucidating whether and how cardiac fibroblasts affect the development of cardiac myocytes from the point of view of the changes in the fluctuation of the contraction rhythm of cardiac myocytes in cardiac myocyte-fibroblast co-cultures. The present study suggested that cardiac fibroblasts co-cultured with cardiac myocytes enhanced the intercellular communication among myocytes via gap junctions, thereby stabilizing the spontaneous contraction rhythm of cultured cardiac myocytes.
authors.affiliation: Laboratory of Cellular Cybernetics, Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan.
authors.forename: Takeru
authors.initials: T
authors.lastname: Hachiro
authors.forename: Koichi
authors.initials: K
authors.lastname: Kawahara
authors.forename: Rie
authors.initials: R
authors.lastname: Sato
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Matsuyama
mesh_terms: D000818:Animals; D002450:Cell Communication / Q000502:physiology; D002478:Cells, Cultured; D018920:Coculture Techniques; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D017629:Gap Junctions / Q000502:physiology; D008955:Models, Cardiovascular; D009200:Myocardial Contraction / Q000502:physiology*; D032383:Myocytes, Cardiac / Q000166:cytology / Q000502:physiology*; D051381:Rats; D049490:Systems Biology