TRPC proteins contribute to development of diabetic retinopathy and regulate glyoxalase 1 activity and methylglyoxal accumulation
Objective - Diabetic retinopathy (DR) is induced by an accumulation of reactive metabolites such as ROS, RNS, and RCS species, which were reported to modulate the activity of cation channels of the TRPC family. In this study, we use Trpc1/4/5/6−/− compound knockout mice to analyze the contribution o...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 January 2018
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| In: |
Molecular metabolism
Year: 2018, Volume: 9, Pages: 156-167 |
| ISSN: | 2212-8778 |
| DOI: | 10.1016/j.molmet.2018.01.003 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1016/j.molmet.2018.01.003 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S2212877817306282 
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| Author Notes: | Robin Sachdeva, Andrea Schlotterer, Dagmar Schumacher, Christin Matka, Ilka Mathar, Nadine Dietrich, Rebekka Medert, Ulrich Kriebs, Jihong Lin, Peter Nawroth, Lutz Birnbaumer, Thomas Fleming, Hans-Peter Hammes, Marc Freichel |
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| 245 | 1 | 0 | |a TRPC proteins contribute to development of diabetic retinopathy and regulate glyoxalase 1 activity and methylglyoxal accumulation |c Robin Sachdeva, Andrea Schlotterer, Dagmar Schumacher, Christin Matka, Ilka Mathar, Nadine Dietrich, Rebekka Medert, Ulrich Kriebs, Jihong Lin, Peter Nawroth, Lutz Birnbaumer, Thomas Fleming, Hans-Peter Hammes, Marc Freichel |
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| 520 | |a Objective - Diabetic retinopathy (DR) is induced by an accumulation of reactive metabolites such as ROS, RNS, and RCS species, which were reported to modulate the activity of cation channels of the TRPC family. In this study, we use Trpc1/4/5/6−/− compound knockout mice to analyze the contribution of these TRPC proteins to diabetic retinopathy. - Methods - We used Nanostring- and qPCR-based analysis to determine mRNA levels of TRPC channels in control and diabetic retinae and retinal cell types. Chronic hyperglycemia was induced by Streptozotocin (STZ) treatment. To assess the development of diabetic retinopathy, vasoregression, pericyte loss, and thickness of individual retinal layers were analyzed. Plasma and cellular methylglyoxal (MG) levels, as well as Glyoxalase 1 (GLO1) enzyme activity and protein expression, were measured in WT and Trpc1/4/5/6−/− cells or tissues. MG-evoked toxicity in cells of both genotypes was compared by MTT assay. - Results - We find that Trpc1/4/5/6−/− mice are protected from hyperglycemia-evoked vasoregression determined by the formation of acellular capillaries and pericyte drop-out. In addition, Trpc1/4/5/6−/− mice are resistant to the STZ-induced reduction in retinal layer thickness. The RCS metabolite methylglyoxal, which represents a key mediator for the development of diabetic retinopathy, was significantly reduced in plasma and red blood cells (RBCs) of STZ-treated Trpc1/4/5/6−/− mice compared to controls. GLO1 is the major MG detoxifying enzyme, and its activity and protein expression were significantly elevated in Trpc1/4/5/6-deficient cells, which led to significantly increased resistance to MG toxicity. GLO1 activity was also increased in retinal extracts from Trpc1/4/5/6−/− mice. The TRPCs investigated here are expressed at different levels in endothelial and glial cells of the retina. - Conclusion - The protective phenotype in diabetic retinopathy observed in Trpc1/4/5/6−/− mice is suggestive of a predominant action of TRPCs in Müller cells and microglia because of their central position in the retention of a proper homoeostasis of the neurovascular unit. | ||
| 650 | 4 | |a Diabetic retinopathy | |
| 650 | 4 | |a Glyoxalase1 | |
| 650 | 4 | |a MethylGlyoxal | |
| 650 | 4 | |a Reactive metabolites | |
| 650 | 4 | |a TRPC cation channels | |
| 650 | 4 | |a Vasoregression | |
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