start-ver=1.4
cd-journal=joma
no-vol=447
cd-vols=
no-issue=1
article-no=
start-page=108
end-page=114
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2014
dt-pub=20140425
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Hypoxia-inducible factor 1 alpha regulates branching morphogenesis during kidney development
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The kidneys are exposed to hypoxic conditions during development. Hypoxia-inducible factor (HIF), an important mediator of the response to hypoxia, is believed to have an important role in development. However, the relationship between HIF and branching morphogenesis has not been elucidated clearly. In this study, we examined whether HIF regulates kidney development. We harvested kidneys from day 13 rat embryos (E13K5) and cultured the organs under normoxic (20% 02/5% CO2) or hypoxic (5% 02/5% CO2) conditions. We evaluated the kidneys based on morphology and gene expression. El3K5 cultured under hypoxic conditions had significantly more ureteric bud (UB) branching than the E13Ks cultured under normoxic conditions. In addition, the mRNA levels of GDNF and GDNF receptor (GFR-alpha l), increased under hypoxic conditions in E13K5. When we cultured E13Ks( with the HIF-1 alpha inhibitor digoxin or with siRNA targeting HIF-l alpha under hypoxic conditions, we did not observe increased UB branching. In addition, the expression of GDNF and GFR-alpha 1 was inhibited under hypoxic conditions when the kidneys were treated with siRNA targeting HIF-1 alpha. We also elucidated that hypoxia inhibited UB cell apoptosis and promoted the expression of FGF7 mRNA levels in metanephric mesenchymal (MM) cells in vitro. These findings suggest that hypoxic condition has important roles in inducing branching morphogenesis during kidney development. Hypoxia might mediate branching morphogenesis via not only GDNF/Ret but also FGF signaling pathway.
en-copyright=
kn-copyright=

en-aut-name=TsujiKenji
en-aut-sei=Tsuji
en-aut-mei=Kenji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=KitamuraShinji
en-aut-sei=Kitamura
en-aut-mei=Shinji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MakinoHirofumi
en-aut-sei=Makino
en-aut-mei=Hirofumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Med & Clin Sci

affil-num=2
en-affil=
kn-affil=Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Med & Clin Sci

affil-num=3
en-affil=
kn-affil=Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Med & Clin Sci
en-keyword=HIF-I alpha
kn-keyword=HIF-I alpha
en-keyword=Kidney development
kn-keyword=Kidney development
en-keyword=Hypoxia
kn-keyword=Hypoxia
en-keyword=Ureteric bud branching
kn-keyword=Ureteric bud branching
END