Abstract
Rapanea ferruginea antioxidant and antitumoral properties were not explored before in literature. This study aimed to investigate these biological activities for the R. ferruginea leaf extract and correlate them with its phenolic content and influence in biological membrane dynamics. Thus, in this study, anti/pro-oxidative properties of R. ferruginea leaf extract by in vitro DPPH and TBARS assays, with respect to the free radical reducing potential and to its activity regarding membrane free radical-induced peroxidation, respectively. Furthermore, preliminary tests related to the extract effect on in vitro glioma cell viability were also performed. In parallel, the phenolic content was detected by HPLC–DAD and included syringic and trans-cinnamic acids, quercetrin, catechin, quercetin, and gallic acid. In an attempt to correlate the biological activity of R. ferruginea extract and its effect on membrane dynamics, the molecular interaction between the extract and a liposomal model with natural-sourced phospholipids was investigated. Location and changes in vibrational, rotational, and translational lipid motions, as well as in the phase state of liposomes, induced by R. ferruginea extract, were monitored by Fourier-transform infrared spectroscopy, nuclear magnetic resonance, differential scanning calorimetry, and UV–visible spectroscopy. In its free form, the extract showed promising in vitro antioxidant properties. Free-form extract (at 1000µ g/mL) exposure reduced glioma cell in vitro viability in 40%, as evidenced by MTT tests. Pro-oxidant behavior was observed when the extract was loaded into liposomes. A 70.8% cell viability reduction was achieved with 500 µg/mL of liposome-loaded extract. The compounds of R. ferruginea extract ordered liposome interface and disorder edits a polar region. Phenolic content, as well as membrane interaction and modulation may have an important role in the oxidative and antitumoral activities of the R. ferruginea leaf extract.
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Abbreviations
- ASO:
-
Soybean asolectin
- DLS:
-
Dynamic light scattering
- DMPC:
-
Dimyristoylphosphatidylcholine
- DPPC:
-
Dipalmitoylphosphatidylcholine
- DSC:
-
Differential scanning calorimetry
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- ∆H:
-
Enthalpy variation
- FBS:
-
Fetal bovine serum
- FID:
-
Free induction decay
- FTIR:
-
Fourier-transform infrared spectroscopy
- HATR–FTIR:
-
Horizontal attenuated total reflection–Fourier-transform infrared spectroscopy
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NMR:
-
Nuclear magnetic resonance
- ∙OH:
-
Hydroxyl radical
- S.D.:
-
Standard deviation
- TBARS:
-
Thiobarbituric acid-reactive substances
- TSP:
-
Sodium 3-(trimethylsilyl)-[2,2,3,3-2H4]-1-propionate
- τ:
-
Time delay
- ν:
-
Stretching vibration
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Acknowledgements
The authors would like to thank two Brazilian agencies, namely the Conselho de Desenvolvimento Científico e Tecnológico (CNPq) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for their financial support. Also, we wish to thanks Professor João Cardoso de Lima, Ph.D. (Laboratory of Material Synthesis and Characterization- LSCM) from Federal University of Santa Catarina, for the careful assistance in DSC experiments. This paper is part of Desirée Magalhães dos Santos’ Master’s thesis which was carried out at the Post-graduate Program in Technological and Environmental Chemistry (FURG).
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dos Santos, D.M., Rocha, C.V.J., da Silveira, E.F. et al. In Vitro Anti/Pro-oxidant Activities of R. ferruginea Extract and Its Effect on Glioma Cell Viability: Correlation with Phenolic Compound Content and Effects on Membrane Dynamics. J Membrane Biol 251, 247–261 (2018). https://doi.org/10.1007/s00232-018-0017-z
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DOI: https://doi.org/10.1007/s00232-018-0017-z