The Newly Discovered Cytokine IL-34 Is Expressed in Gingival Fibroblasts, Shows Enhanced Expression by Pro-Inflammatory Cytokines, and Stimulates Osteoclast Differentiation

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Boström, Elisabeth A.Karolinska Institutet (author)

The Newly Discovered Cytokine IL-34 Is Expressed in Gingival Fibroblasts, Shows Enhanced Expression by Pro-Inflammatory Cytokines, and Stimulates Osteoclast Differentiation

Article/chapterEnglish2013

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2013-12-10
Public Library of Science,2013
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LIBRIS-ID:oai:DiVA.org:umu-85797
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85797URI
https://doi.org/10.1371/journal.pone.0081665DOI
http://kipublications.ki.se/Default.aspx?queryparsed=id:128046743URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Background: Interleukin-34 (IL-34) is a recently discovered cytokine functionally overlapping macrophage colony stimulating factor (M-CSF), a mediator of inflammation and osteoclastogenesis in bone-degenerative diseases such as rheumatoid arthritis. The objective of this study was to assess the expression of IL-34 in human gingival fibroblasts and investigate if the pro-inflammatory cytokines tumor necrosis factor alpha (TNF-alpha) and Interleukin-1B (IL-1 beta) modulate its expression, and moreover if IL-34 could contribute to recruitment of bone-resorbing osteoclasts. Methods: IL-34 expression was evaluated in gingival fibroblasts by real time PCR following stimulation by TNF-alpha, IL-1 beta, and treatment with inhibitors of intracellular pathways. The formation of osteoclasts was evaluated by tartrate-resistant acid phosphatase (TRAP) staining of bone marrow macrophages treated with IL-34 or M-CSF in addition to receptor activator of nuclear factor kappa-B ligand (RANKL). Results: IL-34 was expressed in gingival fibroblasts. The expression was enhanced by TNF-alpha and IL-1 beta, regulated by the transcription factor nuclear factor kappa B (NF-kappa B) and activation of c-Jun N-terminal kinase (JNK). Further, IL-34 supports RANKL-induced osteoclastogensis of bone marrow macrophages, independently of M-CSF. Summary: In conclusion, this study shows for the first time IL-34 expression in human gingival fibroblasts, stimulated by TNF-alpha and IL-1 beta, key mediators of periodontal inflammation. Furthermore, IL-34 can be substituted for M-CSF in RANKL-induced osteoclastogenesis. IL-34 may contribute to inflammation and osteoclastogenesis in bone-degenerative diseases such as periodontitis.

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Lundberg, Pernilla,1965-Umeå universitet,Institutionen för odontologi(Swepub:umu)pelu0004 (author)
Karolinska InstitutetInstitutionen för odontologi (creator_code:org_t)

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In:PLOS ONE: Public Library of Science8:12, s. e81665-1932-6203

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Dentistry

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