PMID- 27262294 OWN - NLM STAT- MEDLINE DCOM- 20170222 LR - 20170222 IS - 1573-6776 (Electronic) IS - 0141-5492 (Linking) VI - 38 IP - 9 DP - 2016 Sep TI - Enterococcus faecalis promotes osteoclast differentiation within an osteoblast/osteoclast co-culture system. PG - 1443-8 LID - 10.1007/s10529-016-2142-z [doi] AB - OBJECTIVE: To investigate the effects of heat-killed Enterococcus faecalis ATCC 29212 and P25RC clinical strain (derived from an obturated root canal with apical periodontitis) on osteoclast differentiation within an osteoblast/osteoclast co-culture system. RESULTS: Heat-killed E. faecalis significantly increased the proportion of multinucleated osteoclastic cells (MNCs) within the co-culture system. The IL-6 level was significantly increased upon exposure to heat-killed E. faecalis. Gene expression levels of NFATc1 and cathepsin K were significantly up-regulated compared to the untreated control. EphrinB2 and EphB4 expressions at both the mRNA and protein levels were also significantly upregulated compared to the untreated control. CONCLUSIONS: Heat-killed E. faecalis can induce osteoclast differentiation within the osteoblast/osteoclast co-culture system in vitro, possibly through ephrinB2-EphB4 bidirectional signaling. FAU - Deng, Zuhui AU - Deng Z AD - Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 999077, China. AD - Shenzhen ENT Institute, Shenzhen Longgang ENT Hospital, Shenzhen, 518172, Guangdong, China. FAU - Wang, Shuai AU - Wang S AD - Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 999077, China. FAU - Heng, Boon Chin AU - Heng BC AD - Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 999077, China. FAU - Yuan, Changyong AU - Yuan C AD - Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 999077, China. FAU - Zhang, Chengfei AU - Zhang C AD - Endodontics, Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 999077, China. zhangcf@hku.hk. LA - eng PT - Journal Article DEP - 20160604 PL - Netherlands TA - Biotechnol Lett JT - Biotechnology letters JID - 8008051 SB - IM MH - Animals MH - Blotting, Western MH - Cell Differentiation/genetics/physiology MH - Coculture Techniques MH - Enterococcus faecalis/*pathogenicity MH - Enzyme-Linked Immunosorbent Assay MH - Mice MH - Osteoblasts/*microbiology MH - Osteoclasts/*microbiology MH - Real-Time Polymerase Chain Reaction MH - Signal Transduction/genetics/physiology OTO - NOTNLM OT - Enterococcus faecalis OT - EphB4 OT - EphrinB2 OT - Multinucleated osteoclastic cells OT - Osteoblasts OT - Osteoclast differentiation OT - Osteoclasts EDAT- 2016/06/06 06:00 MHDA- 2017/02/23 06:00 CRDT- 2016/06/06 06:00 PHST- 2016/04/27 00:00 [received] PHST- 2016/05/24 00:00 [accepted] PHST- 2016/06/06 06:00 [entrez] PHST- 2016/06/06 06:00 [pubmed] PHST- 2017/02/23 06:00 [medline] AID - 10.1007/s10529-016-2142-z [pii] AID - 10.1007/s10529-016-2142-z [doi] PST - ppublish SO - Biotechnol Lett. 2016 Sep;38(9):1443-8. doi: 10.1007/s10529-016-2142-z. Epub 2016 Jun 4.