Chemical investigations of a methanolic extract of the twigs of Vernonia amygdalina Delile (Asteraceae) resulted in the isolation and identification of three previously undescribed highly oxygenated Δ stigmastane-type steroids namely vernonins U-W (1-3) along with six known compounds (4-9). The structural characterization of all the isolated compounds has been conducted via comprehensive 1D and 2D-NMR spectroscopy as well as HRMS. The seven steroidal derivatives 1-7 were evaluated for their antiplasmodial activity against the chloroquine-resistant strain P. falciparum Dd2 (PfDd2) and their hemolytic effect on human red blood cells (RBCs). Vernonins U (1), A (4) and stigmasterol-3-O-β-d-glucopyranoside (7) showed the highest activity with IC values of (5.47 ± 0.01) μg/mL, (6.02 ± 0.13) μg/mL and (6.34 ± 0.80) μg/mL, respectively, against PfDd2, while vernonin W (3) showed moderate activity of (21.20 ± 0.40) μg/mL. None of the tested compounds displayed hemolytic effects on human RBCs up to 100 μg/mL indicating their safety. These results enrich the known chemistry of V. amygdalina and support its use in folk medicine for the treatment of malaria. This encourages further research towards new antiplasmodial drug candidates from this plant.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.phytochem.2024.114286 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Stabilizing the Fe Species of Nickel-Iron Double Hydroxide via Chelating Asymmetric Aldehyde-Containing THB Ligand for Long-Lasting Water Oxidation.
Adv Mater
December 2024
State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Nickel-iron layered double hydroxides (NiFe LDHs) are considered as promising substitutes for precious metals in oxygen evolution reaction (OER). However, most of the reported NiFe LDHs suffer from poor long-term stability because of the Fe loss during OER resulting in severe inactivation. Herein, a dynamically stable chelating interface through in situ transformation of asymmetric aldehyde-ligand (THB, 1,3,5-Tris(3'-hydroxy-4'-formylphenyl)-benzene) modified NiFe LDHs to anchor Fe and significantly enhance the OER stability is reported.
View Article and Find Full Text PDFA Mitochondria-Targeted Iridium(iii) Phosphorescent Probe for Selective Detection of Hypochlorite in Living Cells.
Chem Asian J
December 2024
Nanjing University of Posts and Telecommunications, 9 Wenyuan road, nanjing, CHINA.
Hypochlorous acid(HClO)/hypochlorite ion (ClO-) is a highly reactive oxygen species (ROS) that play a crucial role in various biological processes. In this paper, a "turn-on" phosphorescent probe (Ir-TPP) for detecting ClO- in mitochondria was designed and synthesized. In solution, Ir-TPP is minimal emission due to rapid isomerization of C=N-OH as an efficient non-radiative decay process.
View Article and Find Full Text PDFMolecular characterization, transcriptional profiling, and antioxidant activity assessment of nucleoredoxin (NXN) as a novel member of thioredoxin from red-lip mullet (Planiliza haematocheilus).
Fish Shellfish Immunol
December 2024
Department of Marine Life Sciences & Center for Genomic Selection in Korean Aquaculture, Jeju National University, Jeju 63243, Republic of Korea; Marine Life Research Institute, Jeju National University, Jeju 63333, Republic of Korea. Electronic address:
Nucleoredoxin (NXN) is a prominent oxidoreductase enzyme, classified under the thioredoxin family, and plays a pivotal role in regulating cellular redox homeostasis. Although the functional characterization of NXN has been extensively studied in mammals, its role in fish remains relatively unexplored. In this study, the NXN gene from Planiliza haematocheilus (PhNXN) was molecularly and functionally characterized using in silico tools, expression analyses, and in vitro assays.
View Article and Find Full Text PDFFactors associated with oxidative stress in virologically suppressed people living with HIV on long-term antiretroviral therapy.
AIDS Res Ther
December 2024
Fondazione Policlinico Universitario A. Gemelli IRCCS, UOC Malattie Infettive, Largo Agostino Gemelli 8, Rome, 00168, Italia.
Background: Oxidative stress (OS) is the imbalance between oxidant and antioxidant molecules, in favour of oxidants, that has been associated with an increased risk of morbidity and mortality in ART-treated people living with HIV (PLWH). We aimed to assess factors associated with OS in virologically suppressed PLWH on long-term modern ART.
Method: In this cross-sectional study we evaluated OS by measuring both the levels of derivatives-reactive oxygen metabolites (d-ROMs) and the biological antioxidant potential (BAP).
Association between serum albumin levels at admission and clinical outcomes in pediatric intensive care units: a multi-center study.
BMC Pediatr
December 2024
Department of Pediatric Intensive Care, Faculty of Medicine, Cukurova University, Adana, Turkey.
Background: Albumin, a vital component in regulating human blood oncotic pressure, plays an important role in the prediction of prognosis in pediatric patients.Previous research identified significant differences in serum albumin levels of healthy and critically ill children.
Methods: The present study aims to investigate the correlation between albumin levels measured during pediatric intensive care unit(PICU) admission and clinical outcomes.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!