1. NanoUPLC-MSE proteomic analysis of osteoclastogenesis downregulation by IL-4.
- Author
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Freire, Mirna S., Cantuária, Ana Paula C., Lima, Stella M.F., Almeida, Jeeser A., Murad, André M., Franco, Octavio L., and Rezende, Taia M.B.
- Subjects
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PROTEOMICS , *OSTEOCLASTOGENESIS , *INTERLEUKIN-4 , *BONE resorption , *HOMEOSTASIS - Abstract
Bone resorption is an important factor in bone homeostasis and imbalance can cause several diseases. In osteoimmunology, IL-4 has been described as an important factor in promoting M2 macrophage profile. In order to shed some light on the effect of IL-4 on osteoclast precursors in the presence of RANKL, cytokines and nitric oxide (NO) production and the proteomic profile were analyzed. The presence of IL-4 in in vitro osteoclastogenesis provides production of TNF-α, IL-1α, IL-1β, IL-10 and IL-12 at basal cell levels. Regarding NO production, IL-4 was sufficient to increase the basal NO levels. Proteomic analyses identified 877 global proteins. IL-4 in in vitro RANKL-mediated osteoclastogenesis leads to the expression of 118 proteins. The presence of rIL-4 in in vitro rRANKL-mediated-osteoclastogenesis downregulated this process. However, the proteomics findings in the osteoclastogenesis demonstrated a much greater effect on osteoclast precursor cells than on RANKL-differentiated osteoclasts. These results suggest that the main effect of IL-4 in pre-osteoclast cells leads to a M2 macrophage activation, and this probably contributed to a reduction in osteoclastogenesis when both stimuli were used. This study noticed that IL-4 plays an important regulatory role in bone homeostasis due to its suppressive potential of precursor osteoclast cells. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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