Abstract:
:We previously identified the novel gene, periodontal ligament-associated protein-1 (PLAP-1)/asporin and reported that PLAP-1/asporin inhibited bone morphogenetic protein-2 (BMP-2)-induced cytodifferentiation of periodontal ligament (PDL) cells probably by direct interaction with BMP-2. Here, we elucidated the detailed regulatory mechanism of this protein on BMP-2-induced cytodifferentiation of PDL cells. Recombinant PLAP-1/asporin inhibited BMP-2-induced cytodifferentiation of PDL cells and competitively prevented BMP-2 from binding to the BMP receptor-IB (BMPR-IB), resulting in inhibition of BMP-dependent activation of Smad proteins. The induction of mutation to the leucine-rich repeat (LRR) motif, especially LRR5, within PLAP-1/asporin rescued the inhibitory effect of PLAP-1/asporin on BMP-2. By contrast, a 26-amino acid peptide in the PLAP-1/asporin LRR5 sequence inhibited BMP-2 activity. Our findings indicate that PLAP-1/asporin inhibits BMP-2-induced differentiation of PDL cells resulting from inactivation of the BMP-2 signaling pathway and that LRR, especially LRR5 of PLAP-1/asporin, plays an important role in the PLAP-1/asporin-BMP-2 interaction.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Tomoeda M,Yamada S,Shirai H,Ozawa Y,Yanagita M,Murakami Sdoi
10.1016/j.bbrc.2008.03.158subject
Has Abstractpub_date
2008-06-27 00:00:00pages
191-6issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(08)00632-3journal_volume
371pub_type
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