title: Expression of dentin sialophosphoprotein in non-mineralized tissues.
abstract: Dentin sialophosphoprotein (DSPP) and its cleaved products, dentin phosphoprotein (DPP) and dentin sialoprotein (DSP), play important roles in biomineralization. Believed to be tooth specific, the authors' group revealed its expression in bone, and more recently, they and other groups also showed its expression in a few types of soft tissues. In this study, the authors systematically examined the expression of DSPP in a variety of non-mineralized tissues using reverse-transcription polymerase chain reaction (RT-PCR), real-time PCR, Western immunoblotting, and immunohistochemistry analyses in wild-type mice as well as β-galactosidase assays in the Dspp lacZ knock-in mice. These approaches showed the presence of DSPP in the salivary glands, cartilage, liver, kidney, and brain and its absence in the heart and spleen. Real-time PCR showed that the expression levels of DSPP mRNA in salivary glands, cartilage, liver, and kidney were higher than in the bone. Interestingly, DSPP was observed in the pericytes of blood vessels in the dental pulp, which are believed to be able to differentiate into odontoblasts. On the basis of these observations, the authors conclude that DSPP and/or its cleaved products may fulfill important functions in certain non-mineralized tissues in addition to its role in biomineralization.
authors: Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, USA.
authors: Monica
authors: M
authors: Prasad
authors: Qinglin
authors: Q
authors: Zhu
authors: Yao
authors: Y
authors: Sun
authors: Xiaofang
authors: X
authors: Wang
authors: Ashok
authors: A
authors: Kulkarni
authors: Adele
authors: A
authors: Boskey
authors: Jian Q
authors: JQ
authors: Feng
authors: Chunlin
authors: C
authors: Qin
mesh_terms: D000818:Animals; D015153:Blotting, Western / Q000379:methods; D002113:Calcification, Physiologic; D016326:Extracellular Matrix Proteins / Q000032:analysis* / Q000235:genetics; D005786:Gene Expression Regulation; D007150:Immunohistochemistry / Q000379:methods*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010750:Phosphoproteins / Q000032:analysis* / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D012795:Sialoglycoproteins / Q000032:analysis* / Q000235:genetics; D001616:beta-Galactosidase / Q000032:analysis / Q000235:genetics; D000099311:Dentin Sialophosphoprotein
chemical_list: D016326:Extracellular Matrix Proteins; D010750:Phosphoproteins; D012333:RNA, Messenger; D012795:Sialoglycoproteins; D001616:beta-Galactosidase; D000099311:Dentin Sialophosphoprotein