NDLI: TriPer, an optical probe tuned to the endoplasmic reticulum tracks changes in luminal H2O2

Content Provider	Springer Nature : BioMed Central
Author	Melo, Eduardo Pinho Lopes, Carlos Gollwitzer, Peter Lortz, Stephan Lenzen, Sigurd Mehmeti, Ilir Kaminski, Clemens F. Ron, David Avezov, Edward
Abstract	Background The fate of hydrogen peroxide (H2O2) in the endoplasmic reticulum (ER) has been inferred indirectly from the activity of ER-localized thiol oxidases and peroxiredoxins, in vitro, and the consequences of their genetic manipulation, in vivo. Over the years hints have suggested that glutathione, puzzlingly abundant in the ER lumen, might have a role in reducing the heavy burden of H2O2 produced by the luminal enzymatic machinery for disulfide bond formation. However, limitations in existing organelle-targeted H2O2 probes have rendered them inert in the thiol-oxidizing ER, precluding experimental follow-up of glutathione’s role in ER H2O2 metabolism. Results Here we report on the development of TriPer, a vital optical probe sensitive to changes in the concentration of H2O2 in the thiol-oxidizing environment of the ER. Consistent with the hypothesized contribution of oxidative protein folding to H2O2 production, ER-localized TriPer detected an increase in the luminal H2O2 signal upon induction of pro-insulin (a disulfide-bonded protein of pancreatic β-cells), which was attenuated by the ectopic expression of catalase in the ER lumen. Interfering with glutathione production in the cytosol by buthionine sulfoximine (BSO) or enhancing its localized destruction by expression of the glutathione-degrading enzyme ChaC1 in the lumen of the ER further enhanced the luminal H2O2 signal and eroded β-cell viability. Conclusions A tri-cysteine system with a single peroxidatic thiol enables H2O2 detection in oxidizing milieux such as that of the ER. Tracking ER H2O2 in live pancreatic β-cells points to a role for glutathione in H2O2 turnover.
Related Links	https://bmcbiol.biomedcentral.com/counter/pdf/10.1186/s12915-017-0367-5.pdf
Ending Page	15
Page Count	15
Starting Page	1
File Format	HTM / HTML
ISSN	17417007
DOI	10.1186/s12915-017-0367-5
Journal	BMC Biology
Issue Number	1
Volume Number	15
Language	English
Publisher	BioMed Central
Publisher Date	2017-03-27
Access Restriction	Open
Subject Keyword	Life Sciences Endoplasmic reticulum Redox H2O2 probe Hydrogen peroxide Glutathione Fluorescent protein sensor Fluorescence lifetime imaging Live cell imaging Pancreatic β-cells
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics Structural Biology Biochemistry, Genetics and Molecular Biology Plant Science Biotechnology Physiology Agricultural and Biological Sciences Cell Biology Developmental Biology
Journal Impact Factor	4.4/2023
5-Year Journal Impact Factor	5.4/2023

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