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Data of H₂O₂ release from AQP8-knockdown rat hepatocyte mitochondria.

ABSTRACT: This article reports experimental data related to the research article entitled "Mitochondrial aquaporin-8 is involved in SREBP-controlled hepatocyte cholesterol biosynthesis" [Danielli et al., 2019]. We present data about hydrogen peroxide (H₂O₂) release from mitochondria isolated from rat hepatocytes with or without silencing of aquaporin-8 (AQP8) protein expression. The rate of mitochondrial H₂O₂ release (pmoles/min/mg mitochondrial protein) was found to be decreased by about 50% in AQP8-knockdown mitochondria.

SUBMITTER: Danielli M

PROVIDER: S-EPMC6660618 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Data of H2O2 release from AQP8-knockdown rat hepatocyte mitochondria.

Danielli Mauro M Marrone Julieta J Capiglioni Alejo M AM Marinelli Raúl A RA

Data in brief 20190306

This article reports experimental data related to the research article entitled "Mitochondrial aquaporin-8 is involved in SREBP-controlled hepatocyte cholesterol biosynthesis" [Danielli et al., 2019]. We present data about hydrogen peroxide (H2O2) release from mitochondria isolated from rat hepatocytes with or without silencing of aquaporin-8 (AQP8) protein expression. The rate of mitochondrial H2O2 release (pmoles/min/mg mitochondrial protein) was fou ...[more]

PMID: 31372390

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Project description:Peroxiporins are distinct aquaporins (AQP) which, beside water, also facilitate the bidirectional transport of hydrogen peroxide (H2O2) across cellular membranes. H2O2 serves as the major reactive oxygen species that mediates essential cell signaling events. In pancreatic β-cells, H2O2 has been associated with the regulation of cell growth but in excess it leads to failure of insulin secretion, making it important for diabetes mellitus (DM) pathogenesis. In the present study, the role of aquaporin-8 (AQP8) as a peroxiporin was investigated in RINm5F cells. The role of AQP8 was studied in an insulin-producing cell model, on the basis of stable AQP8 overexpression (AQP8↑) and CRISPR/Cas9-mediated AQP8 knockdown (KD). A complete AQP8 knock-out was found to result in cell death, however we demonstrate that mild lentiviral re-expression through a Tet-On-regulated genetically modified AQP8 leads to cell survival, enabling functional characterization. Proliferation and insulin content were found to be increased in AQP8↑ cells underlining the importance of AQP8 in the regulation of H2O2 homeostasis in pancreatic β-cells. Colocalization analyses of V5-tagged AQP8 proteins based on confocal microscopic imaging revealed its membrane targeting to both the mitochondria and the plasma membrane, but not to the ER, the Golgi apparatus, insulin vesicles, or peroxisomes. By using the fluorescence H2O2 specific biosensor HyPer together with endogenous generation of H2O2 using d-amino acid oxidase, live cell imaging revealed enhanced H2O2 flux to the same subcellular regions in AQP8 overexpressing cells pointing to its importance in the development of type-1 DM. Moreover, the novel ultrasensitive H2O2 sensor HyPer7.2 clearly unveiled AQP8 as a H2O2 transporter in RINm5F cells. In summary, these studies establish that AQP8 is an important H2O2 pore in insulin-producing RINm5F cells involved in the transport of H2O2 through the mitochondria and cell membrane and may help to explain the H2O2 transport and toxicity in pancreatic β-cells.

Dataset Information

Data of H₂O₂ release from AQP8-knockdown rat hepatocyte mitochondria.

Publications

Data of H<sub>2</sub>O<sub>2</sub> release from AQP8-knockdown rat hepatocyte mitochondria.

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