Notch signaling modulates the nuclear localization of carboxy-terminal- phosphorylated smad2 and controls the competence of ectodermal cells for activin A

Takanori Abe, Miho Furue, Akiko Kondo, Koichi Matsuzaki, Makoto Asashima

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Loss of mesodermal competence (LMC) during Xenopus development is a well known but little understood phenomenon that prospective ectodermal cells (animal caps) lose their competence for inductive signals, such as activin A, to induce mesodermal genes and tissues after the start of gastrulation. Notch signaling can delay the onset of LMC for activin A in animal caps [Coffman, C.R., Skoglund, P., Harris, W.A., Kintner, C.R., 1993. Expression of an extracellular deletion of Xotch diverts cell fate in Xenopus embryos. Cell 73, 659-671], although the mechanism by which this modulation occurs remains unknown. Here, we show that Notch signaling also delays the onset of LMC in whole embryos, as it did in animal caps. To better understand this effect and the mechanism of LMC itself, we investigated at which step of activin signal transduction pathway the Notch signaling act to affect the timing of the LMC. In our system, ALK4 (activin type I receptor) maintained the ability to phosphorylate the C-terminal region of smad2 upon activin A stimulus after the onset of LMC in both control- and Notch-activated animal caps. However, C-terminal-phosphorylated smad2 could bind to smad4 and accumulate in the nucleus only in Notch-activated animal caps. We conclude that LMC was induced because C-terminal-phosphorylated smad2 lost its ability to bind to smad4, and consequently could not accumulate in the nucleus. Notch signal activation restored the ability of C-terminal- phosphorylated smad2 to bind to smad4, resulting in a delay in the onset of LMC.

Original languageEnglish
Pages (from-to)671-680
Number of pages10
JournalMechanisms of Development
Volume122
Issue number5
DOIs
Publication statusPublished - 01-01-2005

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Mental Competency
Aptitude
Xenopus
Type I Activin Receptors
Embryonic Structures
activin A
Activins
Gastrulation
Signal Transduction
Genes

All Science Journal Classification (ASJC) codes

  • Embryology
  • Developmental Biology

Cite this

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title = "Notch signaling modulates the nuclear localization of carboxy-terminal- phosphorylated smad2 and controls the competence of ectodermal cells for activin A",
abstract = "Loss of mesodermal competence (LMC) during Xenopus development is a well known but little understood phenomenon that prospective ectodermal cells (animal caps) lose their competence for inductive signals, such as activin A, to induce mesodermal genes and tissues after the start of gastrulation. Notch signaling can delay the onset of LMC for activin A in animal caps [Coffman, C.R., Skoglund, P., Harris, W.A., Kintner, C.R., 1993. Expression of an extracellular deletion of Xotch diverts cell fate in Xenopus embryos. Cell 73, 659-671], although the mechanism by which this modulation occurs remains unknown. Here, we show that Notch signaling also delays the onset of LMC in whole embryos, as it did in animal caps. To better understand this effect and the mechanism of LMC itself, we investigated at which step of activin signal transduction pathway the Notch signaling act to affect the timing of the LMC. In our system, ALK4 (activin type I receptor) maintained the ability to phosphorylate the C-terminal region of smad2 upon activin A stimulus after the onset of LMC in both control- and Notch-activated animal caps. However, C-terminal-phosphorylated smad2 could bind to smad4 and accumulate in the nucleus only in Notch-activated animal caps. We conclude that LMC was induced because C-terminal-phosphorylated smad2 lost its ability to bind to smad4, and consequently could not accumulate in the nucleus. Notch signal activation restored the ability of C-terminal- phosphorylated smad2 to bind to smad4, resulting in a delay in the onset of LMC.",
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Notch signaling modulates the nuclear localization of carboxy-terminal- phosphorylated smad2 and controls the competence of ectodermal cells for activin A. / Abe, Takanori; Furue, Miho; Kondo, Akiko; Matsuzaki, Koichi; Asashima, Makoto.

In: Mechanisms of Development, Vol. 122, No. 5, 01.01.2005, p. 671-680.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Notch signaling modulates the nuclear localization of carboxy-terminal- phosphorylated smad2 and controls the competence of ectodermal cells for activin A

AU - Abe, Takanori

AU - Furue, Miho

AU - Kondo, Akiko

AU - Matsuzaki, Koichi

AU - Asashima, Makoto

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AB - Loss of mesodermal competence (LMC) during Xenopus development is a well known but little understood phenomenon that prospective ectodermal cells (animal caps) lose their competence for inductive signals, such as activin A, to induce mesodermal genes and tissues after the start of gastrulation. Notch signaling can delay the onset of LMC for activin A in animal caps [Coffman, C.R., Skoglund, P., Harris, W.A., Kintner, C.R., 1993. Expression of an extracellular deletion of Xotch diverts cell fate in Xenopus embryos. Cell 73, 659-671], although the mechanism by which this modulation occurs remains unknown. Here, we show that Notch signaling also delays the onset of LMC in whole embryos, as it did in animal caps. To better understand this effect and the mechanism of LMC itself, we investigated at which step of activin signal transduction pathway the Notch signaling act to affect the timing of the LMC. In our system, ALK4 (activin type I receptor) maintained the ability to phosphorylate the C-terminal region of smad2 upon activin A stimulus after the onset of LMC in both control- and Notch-activated animal caps. However, C-terminal-phosphorylated smad2 could bind to smad4 and accumulate in the nucleus only in Notch-activated animal caps. We conclude that LMC was induced because C-terminal-phosphorylated smad2 lost its ability to bind to smad4, and consequently could not accumulate in the nucleus. Notch signal activation restored the ability of C-terminal- phosphorylated smad2 to bind to smad4, resulting in a delay in the onset of LMC.

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