Document Detail

Rat enamel contains RP59: a new context for a protein from osteogenic and haematopoietic precursor cells.
MedLine Citation:
PMID:  15726423     Owner:  NLM     Status:  MEDLINE    
We have recently identified a protein, RP59, in bone marrow cells and young osteoblasts, in cells involved in bone repair and in young erythroblasts and megakaryocytes. Here, we report immunohistochemical data at the light- and electron-microscope level indicating that RP59 is also present in newly secreted tooth enamel of the rat and in ameloblasts, the formative cells. In enamel matrix, RP59 was located proximal to secretory ameloblasts only, i.e. in newly secreted material. Distal enamel and enamel in association with maturation stage ameloblasts were unlabelled. Secretory ameloblasts contained RP59 in the matrix-proximal region including Tomes' processes, post-secretory ameloblasts in the cell-matrix interface. Western blotting of proteins from tooth germs identified RP59 as a band at 90 kD, co-migrating with RP59 from bone marrow and spleen. Antisera versus a chemically synthesised RP59 peptide and versus a bacteria-synthesised protein fragment reacted in the same manner. In situ hybridisation of tooth tissue revealed RP59 RNA specifically in ameloblasts. The reverse transcription/polymerase chain reaction method identified tooth RNA coding for RP59. Sequence analysis indicated that RP59 RNA from tooth and marrow had the same sequence. An internal sequence motif was found in rat RP59 resembling a signal implicated in secretion of the chicken "engrailed" gene product. The findings indicate that RP59 is a genuine product of ameloblasts and that it is secreted in the course of enamel formation together with other matrix components.
A Krüger; E Somogyi; C Christersson; C Lundmark; K Hultenby; T Wurtz
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-02-22
Journal Detail:
Title:  Cell and tissue research     Volume:  320     ISSN:  0302-766X     ISO Abbreviation:  Cell Tissue Res.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-24     Completed Date:  2005-07-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  141-8     Citation Subset:  IM    
Clinical Research Department, Dental School, Karolinska Institutet, Stockholm, Sweden.
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MeSH Terms
Ameloblasts / chemistry,  ultrastructure
Bone Marrow Cells / chemistry*
Dental Enamel / chemistry*,  ultrastructure
Dental Enamel Proteins / analysis,  chemistry*,  ultrastructure
Extracellular Matrix / chemistry,  ultrastructure
Hematopoietic Stem Cells / chemistry*
Incisor / chemistry
Molar / chemistry
Proteins / analysis*,  chemistry,  ultrastructure
Rats, Sprague-Dawley
Reverse Transcriptase Polymerase Chain Reaction
Tooth Germ / chemistry,  ultrastructure
Reg. No./Substance:
0/Dental Enamel Proteins; 0/Edag1 protein, rat; 0/Proteins

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