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Mitochondrion. 2017 Sep;36:96-102. doi: 10.1016/j.mito.2017.05.003. Epub 2017 May 9.

Systemic PTEN-Akt1-mTOR pathway activity in patients with normal tension glaucoma and ocular hypertension: A case series.

Author information

1
NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK. Electronic address: glascaratos@gmail.com.
2
Department of Clinical Neurosciences, UCL Institute of Neurology, Royal Free Hospital, London, UK.
3
Department of Optometry and Visual Science, City University, London, UK.
4
NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK.
5
UCL Institute of Structural and Molecular Biology, London, UK.
6
Department of Pathology, UCL Institute of Ophthalmology, London, UK.

Abstract

Glaucoma is the most common optic neuropathy in humans and the leading cause of irreversible blindness worldwide. Its prevalence and incidence increase exponentially with ageing and raised intraocular pressure (IOP), while increasing evidence suggests that systemic mitochondrial abnormalities may also be implicated in its pathogenesis. We have recently shown that patients who have not developed glaucoma despite being exposed for many years to high IOP (ocular hypertension - OHT) have more efficient mitochondria, measured in peripheral blood lymphocytes, when compared to age-similar controls and fast progressing normal tension glaucoma (NTG) patients. In this prospective case series we aimed to explore some of the molecular pathways involved in mitochondrial efficiency in glaucoma resistance by measuring the systemic activity (in peripheral blood) of key mitochondrial regulators: the mammalian target of rapamycin (mTOR) and its major upstream regulators and downstream effectors that form the PTEN-Akt1-mTOR signalling pathway. We found no statistically significant difference in the systemic mTOR activity between the three groups (control, NTG and OHT). In line with the mTOR results, there was no significant difference in the activity of both the two major upstream mTOR regulators (PTEN and Akt1) and its two main downstream effectors (S6K and 4EBP1). In a single NTG patient, with history of Raynaud's, significantly higher mTOR activity was noted. We conclude that the PTEN-Akt1-mTOR pathway does not appear to play a central role in mitochondrial efficiency in OHT.

KEYWORDS:

4EBP1; Akt1; Mitochondria; Normal tension glaucoma; Ocular hypertension; PTEN; S6K; mTOR

PMID:
28499984
DOI:
10.1016/j.mito.2017.05.003
[Indexed for MEDLINE]

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