PMID- 26801240 OWN - NLM STAT- MEDLINE DCOM- 20161006 LR - 20181113 IS - 1478-6362 (Electronic) IS - 1478-6354 (Print) IS - 1478-6354 (Linking) VI - 18 DP - 2016 Jan 23 TI - Anti-RANKL treatment inhibits erosive joint destruction and lowers inflammation but has no effect on bone formation in the delayed-type hypersensitivity arthritis (DTHA) model. PG - 28 LID - 10.1186/s13075-016-0931-3 [doi] LID - 28 AB - BACKGROUND: The aims of the present study were to determine the relationship between bone destruction and bone formation in the delayed-type hypersensitivity arthritis (DTHA) model and to evaluate the effect of receptor activator of nuclear factor kappaB ligand (RANKL) blockade on severity of arthritis, bone destruction, and bone formation. METHODS: DTHA was induced in C57BL/6 mice. Inflammation, erosive joint damage, and new bone formation were semiquantitatively scored by histology. Osteoclast activity was assessed in vivo, and messenger RNA (mRNA) expression of mediators of bone destruction and bone formation were analyzed by mRNA deep sequencing. Serum concentrations of tartrate-resistant acid phosphatase 5b, carboxy-terminal telopeptide I (CTX-I), matrix metalloproteinase 3 (MMP3), and serum amyloid P component (SAP) were determined by enzyme-linked immunosorbent assay. Anti-RANKL monoclonal antibody treatment was initiated at the time of immunization. RESULTS: Bone destruction (MMP3 serum levels, cathepsin B activity, and RANKL mRNA) peaked at day 3 after arthritis induction, followed by a peak in cartilage destruction and bone erosion on day 5 after arthritis induction. Periarticular bone formation was observed from day 10. Induction of new bone formation indicated by enhanced Runx2, collagen X, osteocalcin, MMP2, MMP9, and MMP13 mRNA expression was observed only between days 8 and 11. Anti-RANKL treatment resulted in a modest reduction in paw and ankle swelling and a reduction of serum levels of SAP, MMP3, and CTX-I. Destruction of the subchondral bone was significantly reduced, while no effect on bone formation was seen. CONCLUSIONS: Anti-RANKL treatment prevents joint destruction but does not prevent new bone formation in the DTHA model. Thus, although occurring sequentially during the course of DTHA, bone destruction and bone formation are apparently not linked in this model. FAU - Atkinson, Sara Marie AU - Atkinson SM AD - Global Research, Novo Nordisk A/S, 2760, Malov, Denmark. saii@novonordisk.com. AD - Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, 1870 Frederiksberg, C, Denmark. saii@novonordisk.com. FAU - Bleil, Janine AU - Bleil J AD - Medizinische Klinik fur Gastroenterologie, Infektiologie und Rheumatologie, Charite, Campus Benjamin Franklin, Hindenburgdamm 30, 12200, Berlin, Germany. janine.bleil@gmx.de. FAU - Maier, Rene AU - Maier R AD - German Rheumatism Research Center, Berlin, Germany. rene.maier@drfz.de. FAU - Kuhl, Anja A AU - Kuhl AA AD - Medizinische Klinik fur Gastroenterologie, Infektiologie und Rheumatologie, Charite, Campus Benjamin Franklin, Hindenburgdamm 30, 12200, Berlin, Germany. anja.kuehl@charite.de. FAU - Thorn, Mette AU - Thorn M AD - Bioneer, Horsholm, Denmark. mth@bioneer.dk. FAU - Serikawa, Kyle AU - Serikawa K AD - Benaroya Research Institute, Seattle, WA, USA. kserikawa@benaroyaresearch.org. FAU - Fox, Brian AU - Fox B AD - Immunexpress, Seattle, WA, USA. bandrewfox@gmail.com. FAU - Kruse, Kim AU - Kruse K AD - Global Research, Novo Nordisk, Seattle, WA, USA. kimkruse911@gmail.com. FAU - Haase, Claus AU - Haase C AD - Global Research, Novo Nordisk A/S, 2760, Malov, Denmark. csha@novonordisk.com. FAU - Skov, Soren AU - Skov S AD - Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, 1870 Frederiksberg, C, Denmark. sosk@sund.ku.dk. FAU - Nansen, Anneline AU - Nansen A AD - Department of Pharmacology, Zealand Pharma, Glostrup, Denmark. ana@zealandpharma.com. FAU - Syrbe, Uta AU - Syrbe U AD - Medizinische Klinik fur Gastroenterologie, Infektiologie und Rheumatologie, Charite, Campus Benjamin Franklin, Hindenburgdamm 30, 12200, Berlin, Germany. uta.syrbe@charite.de. AD - German Rheumatism Research Center, Berlin, Germany. uta.syrbe@charite.de. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20160123 PL - England TA - Arthritis Res Ther JT - Arthritis research & therapy JID - 101154438 RN - 0 (Antibodies, Monoclonal) RN - 0 (RANK Ligand) RN - 0 (Tnfsf11 protein, mouse) SB - IM MH - Animals MH - Antibodies, Monoclonal/pharmacology/*therapeutic use MH - Arthritis, Experimental/*drug therapy/metabolism/*pathology MH - Female MH - Inflammation/drug therapy/metabolism/pathology MH - Joints/drug effects/metabolism/*pathology MH - Mice MH - Mice, Inbred C57BL MH - Osteogenesis/drug effects/*physiology MH - RANK Ligand/*antagonists & inhibitors/metabolism MH - Rats PMC - PMC4724155 EDAT- 2016/01/24 06:00 MHDA- 2016/10/08 06:00 PMCR- 2016/01/23 CRDT- 2016/01/24 06:00 PHST- 2015/11/18 00:00 [received] PHST- 2016/01/11 00:00 [accepted] PHST- 2016/01/24 06:00 [entrez] PHST- 2016/01/24 06:00 [pubmed] PHST- 2016/10/08 06:00 [medline] PHST- 2016/01/23 00:00 [pmc-release] AID - 10.1186/s13075-016-0931-3 [pii] AID - 931 [pii] AID - 10.1186/s13075-016-0931-3 [doi] PST - epublish SO - Arthritis Res Ther. 2016 Jan 23;18:28. doi: 10.1186/s13075-016-0931-3.