The actin-organizing formin protein Fhod3 is required for postnatal development and functional maintenance of the adult heart in mice

Tomoki Ushijima, Noriko Fujimoto, Sho Matsuyama, Meikun Kan-O, Hiroshi Kiyonari, Go Shioi, Yohko Kage, Shou Yamasaki, Ryu Takeya, Hideki Sumimoto

Research output: Contribution to journalArticle

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Abstract

Cardiac development and function require actin-myosin interactions in the sarcomere, a highly organized contractile structure. Sarcomere assembly mediated by formin homology 2 domain-containing 3 (Fhod3), a member of formins that directs formation of straight actin filaments, is essential for embryonic cardiogenesis. However, the role of Fhod3 in the neonatal and adult stages has remained unknown. Here, we generated floxed Fhod3 mice to bypass the embryonic lethality of an Fhod3 knockout (KO). Perinatal KO of Fhod3 in the heart caused juvenile lethality at around day 10 after birth with enlarged hearts composed of severely impaired myofibrils, indicating that Fhod3 is crucial for postnatal heart development. Tamoxifeninduced conditional KO of Fhod3 in the adult heart neither led to lethal effects nor did it affect sarcomere structure and localization of sarcomere components. However, adult Fhod3-deleted mice exhibited a slight cardiomegaly and mild impairment of cardiac function, conditions that were sustained over 1 year without compensation during aging. In addition to these agerelated changes, systemic stimulation with the α1-adrenergic receptor agonist phenylephrine, which induces sustained hypertension and hypertrophy development, induced expression of fetal cardiac genes that was more pronounced in adult Fhod3- deleted mice than in the control mice, suggesting that Fhod3 modulates hypertrophic changes in the adult heart. We conclude that Fhod3 plays a crucial role in both postnatal cardiac development and functional maintenance of the adult heart.

Original languageEnglish
Pages (from-to)148-162
Number of pages15
JournalJournal of Biological Chemistry
Volume293
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

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Sarcomeres
Actins
Maintenance
Cardiomegaly
Proteins
Adrenergic Agonists
Myofibrils
Phenylephrine
Myosins
Actin Cytoskeleton
Hypertrophy
Parturition
Hypertension
Genes
Aging of materials

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

The actin-organizing formin protein Fhod3 is required for postnatal development and functional maintenance of the adult heart in mice. / Ushijima, Tomoki; Fujimoto, Noriko; Matsuyama, Sho; Kan-O, Meikun; Kiyonari, Hiroshi; Shioi, Go; Kage, Yohko; Yamasaki, Shou; Takeya, Ryu; Sumimoto, Hideki.

In: Journal of Biological Chemistry, Vol. 293, No. 1, 01.01.2018, p. 148-162.

Research output: Contribution to journalArticle

Ushijima, Tomoki ; Fujimoto, Noriko ; Matsuyama, Sho ; Kan-O, Meikun ; Kiyonari, Hiroshi ; Shioi, Go ; Kage, Yohko ; Yamasaki, Shou ; Takeya, Ryu ; Sumimoto, Hideki. / The actin-organizing formin protein Fhod3 is required for postnatal development and functional maintenance of the adult heart in mice. In: Journal of Biological Chemistry. 2018 ; Vol. 293, No. 1. pp. 148-162.
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