Sequential expressions of Notch1, Jagged2 and Math1 in molar tooth germ of mouse.
The Notch signaling pathway is an evolutionary conserved mechanism that plays an important role in cell-cell communication and cell fate in a wide range of tissues. The mammalian family of Notch receptors consists of 4 members: Notch1/2/3/4. The Notch ligand family consists of 5 members: Delta1/3/4 and Jagged1/2. Math1 encodes a murine basic helix-loop-helix (bHLH) transcription factor that acts as positive regulator of cell differentiation. Recently, links between Notch and Math1 pathways were demonstrated in various tissues. Expression of Notch1, Jagged2 and Math1 were analyzed in the mouse molar tooth germ during embryonic stage (E) 13 and E15 and during postnatal stage (PN) 1, PN3, PN5, PN10 and PN14 by using in situ hybridization. Positive Notch1 expression was found at the tooth bud during embryonic stages, but its expression was absent from the basal cells in contact with the dental mesenchyme. Jagged2 and Math1 were strongly expressed in differentiated ameloblasts and odontoblasts and Math1 strong expression was even maintained until PN14 stage. Math1 showed the strongest expression. Our results suggest that the Notch1 signaling pathway through Jagged2 could be importantly related to Math1, directing the process of odontogenesis toward cell differentiation.
Borkosky
Silvia S
SS
Department of Oral Pathology and Medicine, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-Cho, Okayama 700-8525, Japan.
Nagatsuka
Hitoshi
H
Orita
Yorihisa
Y
Tsujigiwa
Hidetsugu
H
Yoshinobu
Junko
J
Gunduz
Mehmet
M
Rodriguez
Andrea P
AP
Missana
Liliana R
LR
Nishizaki
Kazunori
K
Nagai
Noriyuki
N
D000818:Animals; D000831:Animals, Newborn; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism*; D004622:Embryo, Mammalian / Q000033:anatomy & histology / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D000072101:Jagged-2 Protein; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008963:Molar / Q000033:anatomy & histology / Q000502:physiology*; D009805:Odontogenesis / Q000502:physiology; D051881:Receptor, Notch1 / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D014083:Tooth Germ / Q000166:cytology / Q000502:physiology*
D051792:Basic Helix-Loop-Helix Proteins; D000072101:Jagged-2 Protein; D008565:Membrane Proteins; D051881:Receptor, Notch1; C500943:Atoh1 protein, mouse; C490503:Jag2 protein, mouse; C497762:Notch1 protein, mouse