Journal
JOURNAL OF CLINICAL INVESTIGATION
Volume 129, Issue 9, Pages 3640-3656Publisher
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI124099
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Funding
- Wellcome Trust [203141/Z/16/Z, 106241/Z/14/Z, FC001501]
- Kidney Research UK [SF1/2014]
- EU FP7 project BIO-DrIM [305147]
- Oxford Branch of the Ludwig Institute for Cancer Research
- Pathological Society
- Jean Shanks Foundation Research Training Fellowship
- Francis Crick Institute from Cancer Research UK [FC001501]
- UK Medical Research Council [FC001501]
- MRC [MR/P010008/2, MR/R007748/1, MR/P010008/1, MR/N021053/1] Funding Source: UKRI
- Kidney Research UK [SF1/2014] Funding Source: researchfish
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Physiological effects of cellular hypoxia are sensed by prolyl hydroxylase (PHD) enzymes, which regulate HIFs. Genetic interventions on HIF/PHD pathways have revealed multiple phenotypes that extend the known biology of hypoxia. Recent studies have unexpectedly implicated HIF in aspects of multiple immune and inflammatory pathways. However, such studies are often limited by systemic lethal effects and/or use tissue-specific recombination systems, which are inherently irreversible, unphysiologically restricted, and difficult to time. To study these processes better, we developed recombinant mice that expressed tetracycline-regulated shRNAs broadly targeting the main components of the HIF/ PHD pathway, permitting timed bidirectional intervention. We show that stabilization of HIF levels in adult mice through PHD2 enzyme silencing by RNA interference or inducible recombination of floxed alleles results in multilineage leukocytosis and features of autoimmunity. This phenotype was rapidly normalized on reestablishment of the hypoxiasensing machinery when shRNA expression was discontinued. In both situations, these effects were mediated principally through the Hif2a isoform. Assessment of cells bearing Treg markers from these mice revealed defective function and proinflammatory effects in vivo. We believe our findings reveal a new role for the PHD2/HIF2 alpha pathway in the reversible regulation of T cell and immune activity.
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