Lee 2012 Invest Ophthalmol Vis Sci

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Lee S, Sheck L, Crowston JG, Van Bergen NJ, O'Neill EC, O'Hare F, Kong YX, Chrysostomou V, Vincent AL, Trounce IA (2012) Impaired complex-I-linked respiration and ATP synthesis in primary open-angle glaucoma patient lymphoblasts. Invest Ophthalmol Vis Sci 53:2431-7.

» PMID: 22427588

Lee S, Sheck L, Crowston JG, Van Bergen NJ, O'Neill EC, O'Hare F, Kong YX, Chrysostomou V, Vincent AL, Trounce IA (2012) Invest Ophthalmol Vis Sci

Abstract: Purpose: Following the recent demonstration of increased mitochondrial DNA mutations in lymphocytes of POAG patients, the authors sought to characterize mitochondrial function in a separate cohort of POAG. Methods: Using similar methodology to that previous applied to Leber's hereditary optic neuropathy (LHON) patients, maximal adenosine triphosphate (ATP) synthesis and cellular respiration rates, as well as cell growth rates in glucose and galactose media, were assessed in transformed lymphocytes from POAG patients (n = 15) and a group of age- and sex-matched controls (n = 15). Results: POAG lymphoblasts had significantly lower rates of complex-I-driven ATP synthesis, with preserved complex-II-driven ATP synthesis. Complex-I driven maximal respiration was also significantly decreased in patient cells. Growth in galactose media, where cells are forced to rely on mitochondrial ATP production, revealed no significant differences between the control and POAG cohort. Conclusions: POAG lymphoblasts in the study cohort exhibited a defect in complex-I of the oxidative phosphorylation pathway, leading to decreased rates of respiration and ATP production. Studies in LHON and other diseases have established that lymphocyte oxidative phosphorylation measurement is a reliable indicator of systemic dysfunction of this pathway. While these defects did not impact lymphoblast growth when the cells were forced to rely on oxidative ATP supply, the authors suggest that in the presence of a multitude of cellular stressors as seen in the early stages of POAG, these defects may lead to a bioenergetic crisis in retinal ganglion cells and an increased susceptibility to cell death.

Keywords: Primary open-angle glaucoma (POAG), lymphocytes

O2k-Network Lab: AU Melbourne Trounce IA

Labels: Pathology: Cancer 

Organism: Human  Tissue;cell: Blood cells, Lymphocyte  Preparation: Permeabilized cells  Enzyme: Complex I, Complex II;succinate dehydrogenase, Complex V;ATP synthase  Regulation: ATP, Substrate  Coupling state: OXPHOS 

HRR: Oxygraph-2k