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2018 ; 8
(1
): 9497
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HIF stabilization inhibits renal epithelial cell migration and is associated with
cytoskeletal alterations
#MMPMID29934555
Müller S
; Djudjaj S
; Lange J
; Iacovescu M
; Goppelt-Struebe M
; Boor P
Sci Rep
2018[Jun]; 8
(1
): 9497
PMID29934555
show ga
Acute kidney injury (AKI) is a common and potentially lethal complication in the
hospitalized patients, with hypoxic injury being as a major cause. The loss of
renal tubular epithelial cells (TEC), one of the AKI hallmarks, is potentially
followed by tubular regeneration process orchestrated by the remaining uninjured
TECs that undergo proliferation and migration. In this study, we used human
primary TEC to investigate the initiation of tubular cell migration and
associated cytoskeletal alterations in response to pharmacological HIF
stabilization which resembles the pathophysiology of hypoxia. Tubular cells have
been shown to migrate as cohorts in a wound healing assay. Importantly, cells of
distal tubular origin moved faster than those of proximal origin. HIF
stabilization impaired TEC migration, which was confirmed by live single cell
tracking. HIF stabilization significantly reduced tubular cell migration velocity
and promoted cell spreading. In contrast to the control conditions, HIF
stabilization induced actin filaments rearrangement and cell adhesion molecules
including paxillin and focal adhesion kinase. Condensed bundling of keratin
fibers was also observed, while the expression of different types of keratins,
phosphorylation of keratin 18, and the microtubule structure were not altered. In
summary, HIF stabilization reduced the ability of renal tubular cells to migrate
and led to cytoskeleton reorganization. Our data suggested an important
involvement of HIF stabilization during the epithelial migration underlying the
mechanism of renal regeneration in response to AKI.