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2017 ; 8
(ä): 1082
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A Peptide-Fc Opsonin with Pan-Amyloid Reactivity
#MMPMID28928748
Foster JS
; Williams AD
; Macy S
; Richey T
; Stuckey A
; Wooliver DC
; Koul-Tiwari R
; Martin EB
; Kennel SJ
; Wall JS
Front Immunol
2017[]; 8
(ä): 1082
PMID28928748
show ga
There is a continuing need for therapeutic interventions for patients with the
protein misfolding disorders that result in systemic amyloidosis. Recently,
specific antibodies have been employed to treat AL amyloidosis by opsonizing
tissue amyloid deposits thereby inducing cell-mediated dissolution and organ
improvement. To develop a pan-amyloid therapeutic agent, we have produced an
Fc-fusion product incorporating a peptide, p5, which binds many if not all forms
of amyloid. This protein, designated Fcp5, expressed in mammalian cells, forms
the desired bivalent dimer structure and retains pan-amyloid reactivity similar
to the p5 peptide as measured by immunosorbent assays, immunohistochemistry,
surface plasmon resonance, and pulldown assays using radioiodinated Fcp5.
Additionally, Fcp5 was capable of opsonizing amyloid fibrils in vitro using a
pH-sensitive fluorescence assay of phagocytosis. In mice,(125) I-labeled Fcp5
exhibited an extended serum circulation time, relative to the p5 peptide. It
specifically bound AA amyloid deposits in diseased mice, as evidenced by
biodistribution and microautoradiographic methods, which coincided with an
increase in active, Iba-1-positive macrophages in the liver at 48?h postinjection
of Fcp5. In healthy mice, no specific tissue accumulation was observed. The data
indicate that polybasic, pan-amyloid-targeting peptides, in the context of an Fc
fusion, can yield amyloid reactive, opsonizing reagents that may serve as
next-generation immunotherapeutics.