Faculty Publications

Modeling Dioxygenase Enzyme Kinetics in Familial Paraganglioma

Document Type

Article

Keywords

HIF, Hypoxia, Mathematical model, Paraganglioma, PHD

Journal/Book/Conference Title

Biology Open

Volume

4

Issue

10

First Page

1281

Last Page

1289

Abstract

Hypoxia inducible factors (HIFs) play vital roles in cellular maintenance of oxygen homeostasis. These transcription factors are responsible for the expression of genes involved in angiogenesis, metabolism, and cell proliferation. Here, we generate a detailed mathematical model for the enzyme kinetics of α-ketoglutaratedependent HIF prolyl 4-hydroxylase domain (PHD) dioxygenases to simulate our in vitro data showing synergistic PHD inhibition by succinate and hypoxia in experimental models of succinate dehydrogenase loss, which phenocopy familial paraganglioma. Our mathematical model confirms the inhibitory synergy of succinate and hypoxia under physiologically-relevant conditions. In agreement with our experimental data, the model predicts that HIF1α is not stabilized under atmospheric oxygen concentrations, as observed. Further, the model confirms that addition of α-ketoglutarate can reverse PHD inhibition by succinate and hypoxia in SDH-deficient cells.

Department

Department of Chemistry and Biochemistry

Original Publication Date

1-1-2015

DOI of published version

10.1242/bio.013623

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