Special Issues

Antioxidant Molecules from Natural Sources: Functions and Mechanisms
Editor: Yanka Karamalakova and Galina Nikolova

Submission Deadline: 15 December 2023 (Status: Open)


Special Issue Editor


Assoc. Prof. Yanka Karamalakova      Email   |   Website
Medical Faculty, Trakia University, Stara Zagora, Bulgaria
Interests: natural antioxidants; structure; antioxidant compounds; protective mechanism; functionality; oxidative stress; ROS/RNS; protectors; lipid peroxidation; inflammation; lipid/ROS metabolisms; fibrosis; preterm pregnancy; neurodegenerative disease; cancer



Assoc. Prof. Galina Nikolova      Email   |   Website
Medical Faculty, Trakia University, Stara Zagora, Bulgaria
Interests: natural antioxidants; structure; antioxidant compounds; cellular protective mechanism; cellular functionality; oxidative stress; ROS/RNS; protectors; lipid peroxidation; inflammation; lipid/ROS metabolisms; fibrosis; preterm pregnancy; neurodegenerative disease; cancer


Special Issue Information

Dear Colleagues,

Natural antioxidants known as phenolic compounds, vitamins, carotenoids, etc, benefit antimicrobial and antifungal activity and are key against neurodegenerative and cardiovascular diseases, diabetes, complicated pregnancy, and cancer. The biological activity of natural antioxidants is determined by their ability to capture and neutralize reactive oxygen/nitrogen species (ROS/RNS), like in extensive metabolism in vivo. Thus, they may counteract oxidative damage and therefore, interrupt ROS/RNS mediated chain reactions and improve endogenous-endogenous redox potential.

Some of this natural antioxidants have increased activity in low concentrations, therefore knowing the specifics of their mechanism of action is important to understand the correct maintenance process of cellular signaling, their additional mutagenic, teratogenic, and carcinogenic properties. The cellular protectiveness of natural antioxidants is mediated by protein activity, lipids, DNA, and other macromolecules modulation and their influence on epigenetic mechanisms under various oxidative stress changes. Understanding the mechanism of action of new natural antioxidant molecules in different model systems is challenging but necessary.

This multidisciplinary topic has focused on bringing together original research concerning the extraction, isolation, component characterization, functionality, and mechanism of action of natural antioxidants of natural origin (bioactivity, bioavailability of natural antioxidants and their interaction with other compounds, protective-antioxidant action molecular mechanism, effects on biomacromolecules and metabolic/signaling pathways, the role of natural antioxidants in protecting oxidative induced diseases).

Yana Karamalakova and Galina Nikolova
Guest Editor


Keywords

natural antioxidants; antioxidant compounds; protective mechanism; functionality; oxidative stress


Manuscript Submission Information

Manuscripts should be submitted via our online editorial system at https://www.biolifesas.org/journalx_brha/authorLogOn.action by registering and logging in to this website. Once you are registered, click here to start your submission. Manuscripts can be submitted now or up until the deadline. All papers will go through peer-review process. Accepted papers will be published in the journal (as soon as accepted) and meanwhile listed together on the special issue website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts will be thoroughly refereed through a double-blind peer-review process. Please visit the Instruction for Authors page before submitting a manuscript. Submitted manuscripts should be well formatted in good English.


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  • Article
    Sarmistha Saha, Brigitta Buttari, Elisabetta Profumo, Luciano Saso
    Journal of Biological Regulators and Homeostatic Agents. 2023, 37(7): 3929-3940. https://doi.org/10.23812/j.biol.regul.homeost.agents.20233707.388
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    Background: Polycrystalline aggregates formed in the urinary system leads to the production of reactive oxygen species (ROS), the development of oxidative stress, and renal injury.

    Aim: This study investigated the antioxidant activity of major bioactive components of Macrotyloma uniflorum (MU) such as Quercetin, Kaempferol and Sitosterol and its polyphenolic extract against the pro-oxidant effects triggered by sodium oxalate.

    Methods: We performed molecular docking and molecular dynamics simulations of major bioactive components with superoxide dismutase, catalase, glutathione reductase and glutathione-S-transferase, key enzymes of human antioxidant system. Thereafter, we performed in silico Absorption Distribution Metabolism Excretion-Toxicity (ADME-Tox) analysis to find drug-like molecules, absorption, distribution, metabolism and toxicity study. Then, by spectrophotometric analysis we determined the antioxidant potential of MU extract and of Quercetin, Kaempferol and Sitosterol against oxidative imbalance due to hyperoxaluria in the renal tissue of female Wistar rats002E.

    Results: Molecular dynamics simulations showed high binding interactions of Quercetin with superoxide dismutase (SOD) and glutathione-S-transferase (GST) enzymes. In silico ADME/Tox data analysis showed the polyphenolic components may interact with the antioxidants, thus complementing their antioxidant potency. In wet lab studies, the sodium oxalate treatment specifically induced a significant elevation of lipid peroxidation with a concurrent decrease in reduced glutathione content, superoxide dismutase and catalase activities in a dose-dependent manner in kidney tissue homogenates. The MU extract and the bioactive components Quercetin, Kaempferol and Sitosterol were able to counteract sodium oxalate-induced oxidative stress in a dose-dependent manner, with Quercetin resulting the most effective compound.

    Conclusions: Our in vitro results suggest MU as a possible source of bioactive components to counteract renal injury thus representing an add-on therapy approach in the hyperoxaluria-induced kidney stone formation.