Hypoxia-inducible factor 2α regulates key neutrophil functions in humans, mice, and zebrafish

AAR Thompson, PM Elks, HM Marriott… - Blood, The Journal …, 2014 - ashpublications.org
AAR Thompson, PM Elks, HM Marriott, S Eamsamarng, KR Higgins, A Lewis, L Williams…
Blood, The Journal of the American Society of Hematology, 2014ashpublications.org
Neutrophil lifespan and function are regulated by hypoxia via components of the hypoxia
inducible factor (HIF)/von Hippel Lindau/hydroxylase pathway, including specific roles for
HIF-1α and prolyl hydroxylase-3. HIF-2α has both distinct and overlapping biological roles
with HIF-1α and has not previously been studied in the context of neutrophil biology. We
investigated the role of HIF-2α in regulating key neutrophil functions. Human and murine
peripheral blood neutrophils expressed HIF-2α, with expression up-regulated by acute and …
Abstract
Neutrophil lifespan and function are regulated by hypoxia via components of the hypoxia inducible factor (HIF)/von Hippel Lindau/hydroxylase pathway, including specific roles for HIF-1α and prolyl hydroxylase-3. HIF-2α has both distinct and overlapping biological roles with HIF-1α and has not previously been studied in the context of neutrophil biology. We investigated the role of HIF-2α in regulating key neutrophil functions. Human and murine peripheral blood neutrophils expressed HIF-2α, with expression up-regulated by acute and chronic inflammatory stimuli and in disease-associated inflammatory neutrophil. HIF2A gain-of-function mutations resulted in a reduction in neutrophil apoptosis both ex vivo, through the study of patient cells, and in vivo in a zebrafish tail injury model. In contrast, HIF-2α–deficient murine inflammatory neutrophils displayed increased sensitivity to nitrosative stress induced apoptosis ex vivo and increased neutrophil apoptosis in vivo, resulting in a reduction in neutrophilic inflammation and reduced tissue injury. Expression of HIF-2α was temporally dissociated from HIF-1α in vivo and predominated in the resolution phase of inflammation. These data support a critical and selective role for HIF-2α in persistence of neutrophilic inflammation and provide a platform to dissect the therapeutic utility of targeting HIF-2α in chronic inflammatory diseases.
ashpublications.org