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001-es BibID:	BIBFORM085453
Első szerző:	Zavaczki Erzsébet (biotechnológus)
Cím:	Ferryl Hemoglobin Inhibits Osteoclastic Differentiation of Macrophages in Hemorrhaged Atherosclerotic Plaques / Zavaczki Erzsébet, Gáll Tamás, Zarjou Abolfazl, Hendrik Zoltán, Potor László, Tóth Csaba Zsigmond, Méhes Gábor, Gyetvai Ágnes, Agarwal Anupam, Balla György, Balla József
Dátum:	2020
ISSN:	1942-0900 1942-0994
Megjegyzések:	Intraplaque hemorrhage frequently occurs in atherosclerotic plaques resulting in cell-free hemoglobin, which is oxidized to ferryl hemoglobin (FHb) in the highly oxidative environment. Osteoclast-like cells (OLCs) derived from macrophages signify a counterbalance mechanism for calcium deposition in atherosclerosis. Our aim was to investigate whether oxidized hemoglobin alters osteoclast formation, thereby affecting calcium removal from mineralized atherosclerotic lesions. RANKL- (receptor activator of nuclear factor kappa-? ligand-) induced osteoclastogenic differentiation and osteoclast activity of RAW264.7 cells were studied in response to oxidized hemoglobin via assessing bone resorption activity, expression of osteoclast-specific genes, and the activation of signalization pathways. OLCs in diseased human carotid arteries were assessed by immunohistochemistry. FHb, but not ferrohemoglobin, decreased bone resorption activity and inhibited osteoclast-specific gene expression (tartrate-resistant acid phosphatase, calcitonin receptor, and dendritic cell-specific transmembrane protein) induced by RANKL. In addition, FHb inhibited osteoclastogenic signaling pathways downstream of RANK (receptor activator of nuclear factor kappa-?). It prevented the induction of TRAF6 (tumor necrosis factor (TNF) receptor-associated factor 6) and c-Fos, phosphorylation of p-38 and JNK (c-Jun N-terminal kinase), and nuclear translocation of NF?B (nuclear factor kappa-?) and NFATc1 (nuclear factor of activated T-cells, cytoplasmic 1). These effects were independent of heme oxygenase-1 demonstrated by knocking down HO-1 gene in RAW264.7 cells and in mice. Importantly, FHb competed with RANK for RANKL binding suggesting possible mechanisms by which FHb impairs osteoclastic differentiation. In diseased human carotid arteries, OLCs were abundantly present in calcified plaques and colocalized with regions of calcium deposition, while the number of these cells were lower in hemorrhagic lesions exhibiting accumulation of FHb despite calcium deposition. We conclude that FHb inhibits RANKL-induced osteoclastic differentiation of macrophages and suggest that accumulation of FHb in a calcified area of atherosclerotic lesion with hemorrhage retards the formation of OLCs potentially impairing calcium resorption.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Oxidative Medicine and Cellular Longevity. - 2020 (2020), p. 1-17. -
További szerzők:	Gáll Tamás (1982-) (molekuláris biológus, mikrobiológus) Zarjou, Abolfazl (1979-) (kutató orvos) Hendrik Zoltán (1986-) (orvos) Potor László Tóth Csaba (1968-) (sebész, érsebész) Méhes Gábor (1966-) (patológus) Gyetvai Ágnes Agarwal, Anupam Balla György (1953-) (csecsemő és gyermekgyógyász, neonatológus) Balla József (1959-) (belgyógyász, nephrológus)
Pályázati támogatás:	OTKA-112333 OTKA 138828 OTKA GINOP-2.3.2-15-2016-00043 GINOP EFOP-3.6.2-16-2017-00006 EFOP
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