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2018 ; 9
(1
): 816
Nephropedia Template TP
Koeppen M
; Lee JW
; Seo SW
; Brodsky KS
; Kreth S
; Yang IV
; Buttrick PM
; Eckle T
; Eltzschig HK
Nat Commun
2018[Feb]; 9
(1
): 816
PMID29483579
show ga
Myocardial ischemia-reperfusion injury (IRI) leads to the stabilization of the
transcription factors hypoxia-inducible factor 1-alpha (HIF1-alpha) and
hypoxia-inducible factor 2-alpha (HIF2-alpha). While previous studies implicate
HIF1-alpha in cardioprotection, the role of HIF2-alpha remains elusive. Here we
show that HIF2-alpha induces the epithelial growth factor amphiregulin (AREG) to
elicit cardioprotection in myocardial IRI. Comparing mice with inducible deletion
of Hif1a or Hif2a in cardiac myocytes, we show that loss of Hif2-alpha increases
infarct sizes. Microarray studies in genetic models or cultured human cardiac
myocytes implicate HIF2-alpha in the myocardial induction of AREG. Likewise, AREG
increases in myocardial tissues from patients with ischemic heart disease. Areg
deficiency increases myocardial IRI, as does pharmacologic inhibition of Areg
signaling. In contrast, treatment with recombinant Areg provides cardioprotection
and reconstitutes mice with Hif2a deletion. These studies indicate that
HIF2-alpha induces myocardial AREG expression in cardiac myocytes, which
increases myocardial ischemia tolerance.