PMID- 18705801 OWN - NLM STAT- MEDLINE DCOM- 20081110 LR - 20211020 IS - 1600-0722 (Electronic) IS - 0909-8836 (Print) IS - 0909-8836 (Linking) VI - 116 IP - 4 DP - 2008 Aug TI - Expression of endothelial monocyte-activating polypeptide II in the rat dental follicle and its potential role in tooth eruption. PG - 334-40 LID - 10.1111/j.1600-0722.2008.00547.x [doi] AB - Endothelial monocyte-activating polypeptide II (EMAP-II) is an inflammatory cytokine with chemotactic activity. Because the dental follicle (DF) recruits mononuclear cells (osteoclast precursors) to promote the osteoclastogenesis needed for tooth eruption, it was the aim of this study to determine if EMAP-II contributes to this recruitment. Using a DNA microarray, EMAP-II was found to be highly expressed in vivo in the DFs of day 1 to day 11 postnatal rats, with its expression elevated on days 1 and 3. Use of a short interfering RNA (siRNA) to knock down EMAP-II expression resulted in a reduction in the expression of colony-stimulating factor-1 (CSF-1) and monocyte chemoattractant protein-1 (MCP-1) in the DF cells. Addition of EMAP-II protein to the DF cells partially restored the expression of CSF-1 and MCP-1. In chemotaxis assays using either conditioned medium of the DF cells with anti-(EMAP-II) immunoglobulin G added or conditioned medium of DF cells with EMAP-II knocked down by siRNA, migration indexes of bone marrow mononuclear cells were significantly reduced. These results suggest that EMAP-II is another chemotactic molecule in the dental follicle involved in the recruitment of mononuclear cells, and that EMAP-II may exert its chemotactic function directly by recruiting mononuclear cells and indirectly by enhancing the expression of other chemotactic molecules (CSF-1 and MCP-1). FAU - Liu, Dawen AU - Liu D AD - Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA. FAU - Wise, Gary E AU - Wise GE LA - eng GR - R01 DE008911/DE/NIDCR NIH HHS/United States GR - R01 DE008911-16/DE/NIDCR NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PL - England TA - Eur J Oral Sci JT - European journal of oral sciences JID - 9504563 RN - 0 (Chemokine CCL2) RN - 0 (Cytokines) RN - 0 (Neoplasm Proteins) RN - 0 (RNA-Binding Proteins) RN - 0 (small inducible cytokine subfamily E, member 1) RN - 81627-83-0 (Macrophage Colony-Stimulating Factor) SB - IM MH - Animals MH - Cells, Cultured MH - Chemokine CCL2/biosynthesis MH - Chemotaxis, Leukocyte MH - Cytokines/*biosynthesis/*physiology MH - Dental Sac/*metabolism MH - Leukocytes, Mononuclear/physiology MH - Macrophage Colony-Stimulating Factor/biosynthesis MH - Neoplasm Proteins/*biosynthesis/*physiology MH - Oligonucleotide Array Sequence Analysis MH - Osteoclasts/physiology MH - RNA Interference MH - RNA-Binding Proteins/*biosynthesis/*physiology MH - Rats MH - Rats, Sprague-Dawley MH - Tooth Eruption/*physiology PMC - PMC2597391 MID - NIHMS65027 EDAT- 2008/08/19 09:00 MHDA- 2008/11/11 09:00 PMCR- 2009/08/01 CRDT- 2008/08/19 09:00 PHST- 2008/08/19 09:00 [pubmed] PHST- 2008/11/11 09:00 [medline] PHST- 2008/08/19 09:00 [entrez] PHST- 2009/08/01 00:00 [pmc-release] AID - EOS547 [pii] AID - 10.1111/j.1600-0722.2008.00547.x [doi] PST - ppublish SO - Eur J Oral Sci. 2008 Aug;116(4):334-40. doi: 10.1111/j.1600-0722.2008.00547.x.