IL1β and TNFα promote RANKL-dependent adseverin expression and osteoclastogenesis.

Abstract

Adseverin is an actin-binding protein involved in osteoclastogenesis, but its role in inflammation-induced bone loss is not well-defined. Here, we examined whether IL1β and TNFα regulate adseverin expression to control osteoclastogenesis in mouse primary monocytes and RAW264.7 cells. Adseverin was colocalized with subcortical actin filaments and was enriched in the fusopods of fusing cells. In precursor cells, adseverin overexpression boosted the formation of RANKL-induced multinucleated cells. Both IL1β and TNFα enhanced RANKL-dependent TRAcP activity by 1.6-fold and multinucleated cell formation (cells with ≥3 nuclei) by 2.6- and 3.3-fold, respectively. However, IL1β and TNFα did not enhance osteoclast formation in adseverin-knockdown cells. RANKL-dependent adseverin expression in bone marrow cells was increased by both IL1β (5.4-fold) and TNFα (3.3-fold). Luciferase assays demonstrated that this expression involved transcriptional regulation of the adseverin promoter. Activation of the promoter was restricted to a 1118 bp sequence containing an NF-κB binding site, upstream of the transcription start site. TNFα also promoted RANKL-induced osteoclast precursor cell migration. We conclude that IL1β and TNFα enhance RANKL-dependent expression of adseverin, which contributes to fusion processes in osteoclastogenesis.

• Authors: Yongqiang Wang, Matthew Galli, Alexandra Shade Silver, Wilson Lee, Yushan Song, Yixue Mei, Carly Bachus, Michael Glogauer, Christopher A McCulloch
• Journal: Journal of cell science (J Cell Sci) Vol. 131 Issue 11 (06 05 2018) ISSN: 1477-9137 [Electronic] England
• PMID: 29724913 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2018. Published by The Company of Biologists Ltd.

Chemical References

• Gelsolin
• IL1B protein, mouse
• Interleukin-1beta
• RANK Ligand
• Tnfsf11 protein, mouse
• Tumor Necrosis Factor-alpha
• scinderin

Topics

• Animals
• Cell Fusion
• Gelsolin (genetics)
• Gene Expression Regulation
• Interleukin-1beta (metabolism)
• Male
• Mice
• Mice, Inbred C57BL
• Monocytes
• Osteogenesis (physiology)
• Primary Cell Culture
• Promoter Regions, Genetic
• RANK Ligand (metabolism)
• RAW 264.7 Cells
• Tumor Necrosis Factor-alpha (metabolism)