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2017 ; 8
(8
): e2976
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Loss of PHD3 in myeloid cells dampens the inflammatory response and fibrosis
after hind-limb ischemia
#MMPMID28796258
Beneke A
; Guentsch A
; Hillemann A
; Zieseniss A
; Swain L
; Katschinski DM
Cell Death Dis
2017[Aug]; 8
(8
): e2976
PMID28796258
show ga
Macrophages are essential for the inflammatory response after an ischemic insult
and thereby influence tissue recovery. For the oxygen sensing
prolyl-4-hydroxylase domain enzyme (PHD) 2 a clear impact on the
macrophage-mediated arteriogenic response after hind-limb ischemia has been
demonstrated previously, which involves fine tuning a M2-like macrophage
population. To analyze the role of PHD3 in macrophages, we performed hind-limb
ischemia (ligation and excision of the femoral artery) in myeloid-specific PHD3
knockout mice (PHD3(-/-)) and analyzed the inflammatory cell invasion,
reperfusion recovery and fibrosis in the ischemic muscle post-surgery. In
contrast to PHD2, reperfusion recovery and angiogenesis was unaltered in
PHD3(-/-) compared to WT mice. Macrophages from PHD3(-/-) mice showed, however, a
dampened inflammatory reaction in the affected skeletal muscle tissues compared
to WT controls. This was associated with a decrease in fibrosis and an
anti-inflammatory phenotype of the PHD3(-/-) macrophages, as well as decreased
expression of Cyp2s1 and increased PGE2-secretion, which could be mimicked by
PHD3(-/-) bone marrow-derived macrophages in serum starvation.