Abstract
The product of hexokinase (HK) enzymes, glucose-6-phosphate, can be metabolized through glycolysis or directed to alternative metabolic routes, such as the pentose phosphate pathway (PPP) to generate anabolic intermediates. HK1 contains an N-terminal mitochondrial binding domain (MBD), but its physiologic significance remains unclear. To elucidate the effect of HK1 mitochondrial dissociation on cellular metabolism, we generated mice lacking the HK1 MBD (ΔE1HK1). These mice produced a hyper-inflammatory response when challenged with lipopolysaccharide. Additionally, there was decreased glucose flux below the level of GAPDH and increased upstream flux through the PPP. The glycolytic block below GAPDH is mediated by the binding of cytosolic HK1 with S100A8/A9, resulting in GAPDH nitrosylation through iNOS. Additionally, human and mouse macrophages from conditions of low-grade inflammation, such as aging and diabetes, displayed increased cytosolic HK1 and reduced GAPDH activity. Our data indicate that HK1 mitochondrial binding alters glucose metabolism through regulation of GAPDH.
Original language | English (US) |
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Pages (from-to) | 1261-1277.e9 |
Journal | Molecular cell |
Volume | 82 |
Issue number | 7 |
DOIs | |
State | Published - Apr 7 2022 |
Funding
We would like to thank Meng Shang and Eric Xia for managing our mouse colony and genotyping the mice used in this study. Thanks to Peng Gao from the Metabolomics Core Facility at Robert H. Lurie Comprehensive Cancer Center of Northwestern University for performing metabolomics mass spectrometry for our metabolomics experiments. We thank Young Ah Goo from the Northwestern University Proteomics Center of Excellence for running the mass spectrometry for our proteomics experiments. We thank Lynn Doglio and Pei-Ken from the Northwestern Transgenic and Targeted Mutagenesis for generating the ΔE1HK1 mice. Graphical abstract art was generated using modified images from SMART Servier Medical Art (Les Laboratoires Servier: https://smart.servier.com/ ). Funding for this work was provided through NRSA 5F31HL132552-04 awarded to A.D. and the Ledcuq Foundation and NHLBI HL127646 , HL140973 , and HL138982 awarded to H.A. B.T.L. is supported by the National Institutes of Health under award number, R01DK104927 , and Department of Veterans Affairs , Veterans Health Administration , Office of Research and Development , VA merit (grant no. 1I01BX003382 ). We would like to thank Meng Shang and Eric Xia for managing our mouse colony and genotyping the mice used in this study. Thanks to Peng Gao from the Metabolomics Core Facility at Robert H. Lurie Comprehensive Cancer Center of Northwestern University for performing metabolomics mass spectrometry for our metabolomics experiments. We thank Young Ah Goo from the Northwestern University Proteomics Center of Excellence for running the mass spectrometry for our proteomics experiments. We thank Lynn Doglio and Pei-Ken from the Northwestern Transgenic and Targeted Mutagenesis for generating the ?E1HK1 mice. Graphical abstract art was generated using modified images from SMART Servier Medical Art (Les Laboratoires Servier: https://smart.servier.com/). Funding for this work was provided through NRSA 5F31HL132552-04 awarded to A.D. and the Ledcuq Foundation and NHLBI HL127646, HL140973, and HL138982 awarded to H.A. B.T.L. is supported by the National Institutes of Health under award number, R01DK104927, and Department of Veterans Affairs, Veterans Health Administration, Office of Research and Development, VA merit (grant no. 1I01BX003382). Conceptualization, A.D. S.E.W. C.M.P. A.E.R. J.S. Shapiro, H.-C.C. B.T.L. and H.A.; methodology, A.D. C.M.P. A.E.R. I.B.-S. J.S. Shapiro, and H.-C.C.; investigation, A.D. C.M.P. F.K.-N. L.G. J.A.G. J.S. Stoolman, K.X. K.V.S. Y.C. C.C. K.P.S. P.J.S. and T.A.T.N.; results interpretation, H.A. A.D. C.M.P. J.S. Shapiro, and F.K.-N.; resources, B.T.L. I.B.-S. N.S.C. S.E.W. and H.A.; writing?original draft, H.A. A.D. and C.M.P.; writing?review and editing, C.M.P. J.S. Shapiro, F.K.-N. and H.A.; visualization, A.D.; supervision, S.E.W. B.T.L. and H.A.; funding acquisition, A.D. and H.A. The authors declare no competing interests.
Keywords
- GAPDH
- S-nitrosylation
- hexokinase
- inflammation
- innate immunity
- macrophage
- metabolism
- mitochondria
- pentose phosphate pathway
- subcellular localization
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology