Assraa Hassan Jassim1, Yan Fan2, Nathaniel Pappenhagen2,3, Nana Yaa Nsiah2, Denise M Inman2. 1. Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, Ohio, USA. 2. Department of Pharmaceutical Sciences, North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, Texas, USA. 3. Kent State University School of Biomedical Sciences, Kent, Ohio, USA.
Abstract
Aims: Cellular response to hypoxia can include transition from respiration to glycolysis via upregulation of glycolytic enzymes and transporters, as well as mitophagy induction to eliminate surplus mitochondria. Our purpose was to evaluate the impact of hypoxia-inducible factor-1α (HIF-1α) stabilization on mitochondrial homeostasis and oxidative stress in a chronic model of glaucoma. Results: Retina and optic nerve (ON) were evaluated from young and aged DBA/2J (D2) glaucoma model mice and the control strain, the DBA/2-Gpnmb+. Hypoxic retinal ganglion cells (RGCs) were observed in young and aged D2 retina, with a significant increase in HIF-1α protein in the aged D2 retina. Reactive oxygen species observed in young D2 retina and ON were followed by significant decreases in antioxidant capacity in aged D2 retina and ON. HIF-1α targets such as neuron-specific glucose transporter-3 and lactate dehydrogenase were decreased or unchanged, respectively, in aged D2 retina despite an increased hypoxia response in RGCs. Mitochondrial mass was decreased in aged D2 retina concomitant with decreased mitochondrially encoded electron transport chain transcripts despite a stable nuclear-encoded TFAM (mitochondrial transcription factor), suggesting a breakdown in the nuclear-mitochondrial communication. Decreased mitophagy-associated proteins p62 and Rheb were observed in aged D2 retina, although p62 was significantly increased in the aged D2 ON. Innovation and Conclusion: The increased reactive oxygen species concomitant with HIF-1α upregulation despite reduced glucose transporters, mis-match of nuclear- and mitochondrial-encoded transcripts, and signs of reduced mitophagy suggest that retinas from D2 mice with chronic intraocular pressure elevation transition to pseudohypoxia without consistent metabolic reprogramming before significant RGC loss. Antioxid. Redox Signal. 35, 1341-1357.
Aims: Cellular response to hypoxia can include transition from respiration to glycolysis via upregulation of glycolytic enzymes and transporters, as well as mitophagy induction to eliminate surplus mitochondria. Our purpose was to evaluate the impact of hypoxia-inducible factor-1α (HIF-1α) stabilization on mitochondrial homeostasis and oxidative stress in a chronic model of glaucoma. Results: Retina and optic nerve (ON) were evaluated from young and aged DBA/2J (D2) glaucoma model mice and the control strain, the DBA/2-Gpnmb+. Hypoxic retinal ganglion cells (RGCs) were observed in young and aged D2 retina, with a significant increase in HIF-1α protein in the aged D2 retina. Reactive oxygen species observed in young D2 retina and ON were followed by significant decreases in antioxidant capacity in aged D2 retina and ON. HIF-1α targets such as neuron-specific glucose transporter-3 and lactate dehydrogenase were decreased or unchanged, respectively, in aged D2 retina despite an increased hypoxia response in RGCs. Mitochondrial mass was decreased in aged D2 retina concomitant with decreased mitochondrially encoded electron transport chain transcripts despite a stable nuclear-encoded TFAM (mitochondrial transcription factor), suggesting a breakdown in the nuclear-mitochondrial communication. Decreased mitophagy-associated proteins p62 and Rheb were observed in aged D2 retina, although p62 was significantly increased in the aged D2 ON. Innovation and Conclusion: The increased reactive oxygen species concomitant with HIF-1α upregulation despite reduced glucose transporters, mis-match of nuclear- and mitochondrial-encoded transcripts, and signs of reduced mitophagy suggest that retinas from D2 mice with chronic intraocular pressure elevation transition to pseudohypoxia without consistent metabolic reprogramming before significant RGC loss. Antioxid. Redox Signal. 35, 1341-1357.
Authors: Alessia Peserico; Fulvio Chiacchiera; Valentina Grossi; Antonio Matrone; Dominga Latorre; Marta Simonatto; Aurora Fusella; James G Ryall; Lydia W S Finley; Marcia C Haigis; Gaetano Villani; Pier Lorenzo Puri; Vittorio Sartorelli; Cristiano Simone Journal: Cell Mol Life Sci Date: 2013-01-03 Impact factor: 9.261
Authors: Mohammad Harun-Or-Rashid; Nate Pappenhagen; Peter G Palmer; Matthew A Smith; Victoria Gevorgyan; Gina N Wilson; Samuel D Crish; Denise M Inman Journal: J Neurosci Date: 2018-05-14 Impact factor: 6.167
Authors: Xiaoyu Lin; Caroline A David; Jennifer B Donnelly; Mike Michaelides; Navdeep S Chandel; Xiaoli Huang; Usha Warrior; Frank Weinberg; Kathryn V Tormos; Stephen W Fesik; Yu Shen Journal: Proc Natl Acad Sci U S A Date: 2008-01-02 Impact factor: 11.205
Authors: Carolina Garcia-Villanueva; Elena Milla; José M Bolarin; José J García-Medina; Javier Cruz-Espinosa; Javier Benítez-Del-Castillo; José Salgado-Borges; Francisco J Hernández-Martínez; Elena Bendala-Tufanisco; Irene Andrés-Blasco; Alex Gallego-Martinez; Vicente C Zanón-Moreno; María Dolores Pinazo-Durán Journal: J Clin Med Date: 2022-09-25 Impact factor: 4.964