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Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite.

Publication ,  Journal Article
Carballal, S; Valez, V; Alvarez-Paggi, D; Tovmasyan, A; Batinic-Haberle, I; Ferrer-Sueta, G; Murgida, DH; Radi, R
Published in: Free Radic Biol Med
October 2018

Cationic manganese(III) ortho N-substituted pyridylporphyrins (MnP) act as efficient antioxidants catalyzing superoxide dismutation and accelerating peroxynitrite reduction. Importantly, MnP can reach mitochondria offering protection against reactive species in different animal models of disease. Although an LC-MS/MS-based method for MnP quantitation and subcellular distribution has been reported, a direct method capable of evaluating both the uptake and the redox state of MnP in living cells has not yet been developed. In the present work we applied resonance Raman (RR) spectroscopy to analyze the intracellular accumulation of two potent MnP-based lipophilic SOD mimics, MnTnBuOE-2-PyP5+ and MnTnHex-2-PyP5+ within endothelial cells. RR experiments with isolated mitochondria revealed that the reduction of Mn(III)P was affected by inhibitors of the electron transport chain, supporting the action of MnP as efficient redox active compounds in mitochondria. Indeed, RR spectra confirmed that MnP added in the Mn(III) state can be incorporated into the cells, readily reduced by intracellular components to the Mn(II) state and oxidized by peroxynitrite. To assess the combined impact of reactivity and bioavailability, we studied the kinetics of Mn(III)TnBuOE-2-PyP5+ with peroxynitrite and evaluated the cytoprotective capacity of MnP by exposing the endothelial cells to nitro-oxidative stress induced by peroxynitrite. We observed a preservation of normal mitochondrial function, attenuation of cell damage and prevention of apoptotic cell death. These data introduce a novel application of RR spectroscopy for the direct detection of MnP and their redox states inside living cells, and helps to rationalize their antioxidant capacity in biological systems.

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Published In

Free Radic Biol Med

DOI

EISSN

1873-4596

Publication Date

October 2018

Volume

126

Start / End Page

379 / 392

Location

United States

Related Subject Headings

  • Tandem Mass Spectrometry
  • Superoxides
  • Superoxide Dismutase
  • Spectrum Analysis, Raman
  • Peroxynitrous Acid
  • Oxidative Stress
  • Oxidation-Reduction
  • Mitochondria
  • Metalloporphyrins
  • Endothelial Cells
 

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Carballal, S., Valez, V., Alvarez-Paggi, D., Tovmasyan, A., Batinic-Haberle, I., Ferrer-Sueta, G., … Radi, R. (2018). Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite. Free Radic Biol Med, 126, 379–392. https://doi.org/10.1016/j.freeradbiomed.2018.08.023
Carballal, Sebastián, Valeria Valez, Damián Alvarez-Paggi, Artak Tovmasyan, Ines Batinic-Haberle, Gerardo Ferrer-Sueta, Daniel H. Murgida, and Rafael Radi. “Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite.Free Radic Biol Med 126 (October 2018): 379–92. https://doi.org/10.1016/j.freeradbiomed.2018.08.023.
Carballal S, Valez V, Alvarez-Paggi D, Tovmasyan A, Batinic-Haberle I, Ferrer-Sueta G, et al. Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite. Free Radic Biol Med. 2018 Oct;126:379–92.
Carballal, Sebastián, et al. “Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite.Free Radic Biol Med, vol. 126, Oct. 2018, pp. 379–92. Pubmed, doi:10.1016/j.freeradbiomed.2018.08.023.
Carballal S, Valez V, Alvarez-Paggi D, Tovmasyan A, Batinic-Haberle I, Ferrer-Sueta G, Murgida DH, Radi R. Manganese porphyrin redox state in endothelial cells: Resonance Raman studies and implications for antioxidant protection towards peroxynitrite. Free Radic Biol Med. 2018 Oct;126:379–392.
Journal cover image

Published In

Free Radic Biol Med

DOI

EISSN

1873-4596

Publication Date

October 2018

Volume

126

Start / End Page

379 / 392

Location

United States

Related Subject Headings

  • Tandem Mass Spectrometry
  • Superoxides
  • Superoxide Dismutase
  • Spectrum Analysis, Raman
  • Peroxynitrous Acid
  • Oxidative Stress
  • Oxidation-Reduction
  • Mitochondria
  • Metalloporphyrins
  • Endothelial Cells