title: Bmp signalling in filiform tongue papillae development.
abstract: OBJECTIVE
  Tongue papillae are critical organs in mastication. There are four different types of tongue papillae; fungiform, circumvallate, foliate, and filiform papillae. Unlike the other three taste papillae, non-gustatory papillae, filiform papillae cover the entire dorsal surface of the tongue and are important structures for the mechanical stress of sucking. Filiform papillae are further classified into two subtypes with different morphologies, depending on their location on the dorsum of the tongue. The filiform papillae at the intermolar eminence have pointed tips, whereas filiform papillae with rounded tips are found in other regions (anterior tongue). It remains unknown how the shape of each type of filiform papillae are determined during their development. Bmp signalling pathway has been known to regulate mechanisms that determine the shapes of many ectodermal organs. The aim of this study was to investigate the role of Bmp signalling in filiform papillae development.
  
  
  METHODS
  Comparative in situ hybridization analysis of six Bmps (Bmp2-Bmp7) and two Bmpr genes (Bmpr1a and Bmpr1b) were carried out in filiform papillae development. We further examined tongue papillae in mice over-expressing Noggin under the keratin14 promoter (K14-Noggin).
  
  
  RESULTS
  We identified a dynamic temporo-spatial expression of Bmps in filiform papillae development. The K14-Noggin mice showed pointed filiform papillae in regions of the tongue normally occupied by the rounded type.
  
  
  CONCLUSIONS
  Bmp signalling thus regulates the shape of filiform papillae.
authors.affiliation: Department of Craniofacial Development, GKT Dental Institute, King's College, Guy's Hospital, London Bridge, London SE1 9RT, UK.
authors.forename: Katsushige
authors.initials: K
authors.lastname: Kawasaki
authors.forename: Thantrira
authors.initials: T
authors.lastname: Porntaveetus
authors.forename: Shelly
authors.initials: S
authors.lastname: Oommen
authors.forename: Sarah
authors.initials: S
authors.lastname: Ghafoor
authors.forename: Maiko
authors.initials: M
authors.lastname: Kawasaki
authors.forename: Yoko
authors.initials: Y
authors.lastname: Otsuka-Tanaka
authors.forename: James
authors.initials: J
authors.lastname: Blackburn
authors.forename: John A
authors.initials: JA
authors.lastname: Kessler
authors.forename: Paul T
authors.initials: PT
authors.lastname: Sharpe
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ohazama
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D019485:Bone Morphogenetic Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D051379:Mice; D008822:Mice, Transgenic; D008855:Microscopy, Electron, Scanning; D014059:Tongue / Q000196:embryology* / Q000648:ultrastructure; D000099176:Noggin Protein
chemical_list: D019485:Bone Morphogenetic Proteins; D002352:Carrier Proteins; D000099176:Noggin Protein