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2018 ; 22
(2
): 203-213
Nephropedia Template TP
Kim DY
; Jung SY
; Kim YJ
; Kang S
; Park JH
; Ji ST
; Jang WB
; Lamichane S
; Lamichane BD
; Chae YC
; Lee D
; Chung JS
; Kwon SM
Korean J Physiol Pharmacol
2018[Mar]; 22
(2
): 203-213
PMID29520173
show ga
Tumor undergo uncontrolled, excessive proliferation leads to hypoxic
microenvironment. To fulfill their demand for nutrient, and oxygen, tumor
angiogenesis is required. Endothelial progenitor cells (EPCs) have been known to
the main source of angiogenesis because of their potential to differentiation
into endothelial cells. Therefore, understanding the mechanism of EPC-mediated
angiogenesis in hypoxia is critical for development of cancer therapy. Recently,
mitochondrial dynamics has emerged as a critical mechanism for cellular function
and differentiation under hypoxic conditions. However, the role of mitochondrial
dynamics in hypoxia-induced angiogenesis remains to be elucidated. In this study,
we demonstrated that hypoxia-induced mitochondrial fission accelerates EPCs
bioactivities. We first investigated the effect of hypoxia on EPC-mediated
angiogenesis. Cell migration, invasion, and tube formation was significantly
increased under hypoxic conditions; expression of EPC surface markers was
unchanged. And mitochondrial fission was induced by hypoxia time-dependent
manner. We found that hypoxia-induced mitochondrial fission was triggered by
dynamin-related protein Drp1, specifically, phosphorylated DRP1 at Ser637, a
suppression marker for mitochondrial fission, was impaired in hypoxia
time-dependent manner. To confirm the role of DRP1 in EPC-mediated angiogenesis,
we analyzed cell bioactivities using Mdivi-1, a selective DRP1 inhibitor, and
DRP1 siRNA. DRP1 silencing or Mdivi-1 treatment dramatically reduced cell
migration, invasion, and tube formation in EPCs, but the expression of EPC
surface markers was unchanged. In conclusion, we uncovered a novel role of
mitochondrial fission in hypoxia-induced angiogenesis. Therefore, we suggest that
specific modulation of DRP1-mediated mitochondrial dynamics may be a potential
therapeutic strategy in EPC-mediated tumor angiogenesis.