Othman El Faqer

Satureja nepeta essential oil (EO) is gaining prominence for its multifaceted pharmacological and biotechnological potential. This study aimed to characterize its volatile profile and evaluate its functional capacity as an antioxidant, antibacterial, and antiproliferative agent. Gas Chromatography Mass Spectrometry (GC–MS) profiling was conducted to identify the volatile constituents of the EO. Antioxidant activity was assessed using DPPH, ABTS, TAC, and FRAP assays. Antibacterial activity was evaluated against Gram-positive and Gram-negative pathogens using disk diffusion and MIC determination. In silico molecular docking against bacterial DNA gyrase B was performed to explore potential mechanisms of action. Antiproliferative activity was assessed on the P3X63Ag8.653 myeloma cell line. Chemical profiling identified nine major constituents, dominated by pulegone (68.63%), menthol (6.64%), and cis-pulegol (2.04%). The EO demonstrated significant free radical-scavenging activity, particularly in the TAC assay (EC₅₀ = 3.747 ± 0.577 µg/mL). Antimicrobial evaluations revealed robust inhibitory effects, with Pseudomonas aeruginosa and Salmonella enterica exhibiting the highest susceptibility. In silico modeling corroborated these findings, identifying menthol as the lead ligand (ΔG = −6.09 kcal/mol), suggesting a synergistic mechanism of action. Notably, the EO displayed potent antiproliferative activity (LC₅₀ = 14.060 ± 1.364 µg/mL), falling well within the high-cytotoxicity threshold. Collectively, these findings underscore the pharmacological significance of S. nepeta EO as a potent reservoir of bioactive monoterpenes with antioxidant, antimicrobial, and anticancer properties, meriting further in vivo validation and mechanistic exploration toward its development as a therapeutic or nutraceutical candidate.

Allium sativum is widely consumed and studied plant for its potential health-promoting effects. Despite its widespread use, the impact of different extraction methods on the biological efficacy and specific phytochemical composition of garlic has not yet been fully elucidated. This study investigated the phytochemical profile, antibacterial, antioxidant, and anti-inflammatory properties of ethanolic and aqueous extracts of Moroccan-grown A. sativum using in vitro assays and in silico analyses. Total phenolic and flavonoid contents were determined by colorimetric methods, while phenolic aglycones were identified by HPLC. Antibacterial activity was evaluated by disc diffusion and determined the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values, antioxidant capacity by DPPH, TAC, and FRAP assays, and anti-inflammatory activity through protein denaturation inhibition. ADMET profiling was performed to predict pharmacokinetic and toxicological properties of the identified compounds. The ethanolic extract exhibited higher flavonoid and phenolic contents, reaching 13.27 ± 0.01 mg quercetin/_gextract and 1.57 ± 0.02 mg GAE/_gextract, respectively. HPLC analysis identified syringic, caffeic, ferulic, p-coumaric, and chlorogenic acids, as well as kaempferol and quercetin, whereas apigenin was detected only in the ethanolic extract under the present extraction and analytical conditions. Both extracts inhibited MRSA and E. coli but showed no activity against Pseudomonas aeruginosa. Docking analyses suggested favorable interactions between the identified compounds and bacterial target proteins. The ethanolic extract displayed stronger antioxidant activity, with DPPH IC₅₀ and TAC EC₅₀ values of 1.134 and 2.527 mg/mL, respectively. No ferric reducing activity was detected under the tested conditions. Protein denaturation inhibition ranged from 30.68% to 90.37%, with the aqueous extract showing significantly greater activity (p < 0.003). Overall, extraction-dependent differences in phenolic composition appear to influence the biological properties of A. sativum extracts, warranting further mechanistic and in vivo investigations.

This study investigates the geographical variation in oil quality and bioactivity of Asphodelus microcarpus seed oils collected from five Moroccan regions. Oils were extracted using Soxhlet with petroleum ether, analyzed by GC-MS after FAME preparation, and evaluated for physicochemical properties (ISO/NF standards) and antioxidant activity (DPPH, ABTS). Yields ranged from 18.93% to 21.03%, with stable physicochemical parameters. GC-MS revealed 18 fatty acids (94.82–98.59% of total lipids), showing regional variation. Casablanca and Mohammedia oils had exceptional linoleic acid content (>74%), a first report for Asphodelus species. Meknes and Rabat oils were richer in nervonic and tricosanoic acids. Antioxidant assays showed the strongest activity in Casablanca oil (DPPH IC₅₀ = 291.5 μg/mL; ABTS IC₅₀ = 308.93 μg/mL). PCA revealed clear coastal vs . inland chemotypes. This study represents the first Moroccan report on the fatty acid composition and antioxidant potential of A. microcarpus seed oil. It reveals a distinctive linoleic acid-rich chemotype and highlights the species’ potential as a novel bioactive source for food, health, and industrial applications .

Polymorphonuclear neutrophils (PMNs) contribute to the pathogenesis of arthritis by releasing excessive reactive oxygen species (ROS) and proteolytic enzymes, leading to joint damage. Targeting PMNs activation represents a promising therapeutic approach. This study aimed to evaluate the immunomodulatory and anti-arthritic effects of clove essential oil (CEO) and its main constituent, eugenol, through in vitro, in vivo, and in silico approaches. CEO chemical composition was determined by GC–MS. In vitro assays assessed PMNs degranulation (lysozyme release) and oxidative burst (NBT reduction), along with antioxidant, anti-hemolytic, and antiplatelet activities. Arthritis was induced in mice by CFA injection, and therapeutic efficacy was evaluated by paw edema, histopathology, and body weight monitoring. Molecular docking was conducted to predict interactions with inflammatory targets (COX-1, COX-2, TNF-α). GC–MS revealed 77.67% eugenol in CEO. Both CEO and eugenol significantly inhibited PMN degranulation (52.81% and 57.54%) and oxidative burst (41.85% and 75.41%; p < 0.001). CEO and eugenol also displayed strong antioxidant and anti-hemolytic activities, and reduced collagen-induced platelet aggregation. In vivo, treatment markedly reduced paw edema and histopathological damage without hepatic toxicity. Docking analysis suggested potential inhibitory interactions with COX-2 and TNF-α. CEO and eugenol exert potent anti-inflammatory and immunomodulatory effects by modulating PMNs activity, preventing oxidative stress, and alleviating arthritis symptoms. These findings highlight their therapeutic potential as natural candidates for managing arthritis and related inflammatory conditions.

Essential oils (EOs) from aromatic plants are valuable sources of bioactive compounds with potential applications as natural antimicrobials and antioxidants. This study investigated the chemical composition, antimicrobial and antioxidant activities, and in silico pharmacological properties of EOs extracted from Laurus nobilis, Thymbra capitata, and Mentha piperita, three medicinal species traditionally used in northern Morocco. Hydrodistillation yielded 1.12–1.53% oils, and GC–MS analysis revealed distinct chemotypes: L. nobilis was rich in eucalyptol, linalool, methyleugenol, and α-terpinyl acetate; T. capitata was dominated by carvacrol (80.95%), and M. piperita contained high proportions of linalool (57.37%) and linalyl acetate (28.56%). Antimicrobial assays demonstrated strong activity of all oils against Gram-positive and Gram-negative bacteria as well as Candida species, with T. capitata showing the most potent and broad-spectrum effects (MIC 0.073–9.47 mg/mL), attributed to its high carvacrol content. Antioxidant assays (DPPH and ferric reducing power) identified L. nobilis as the most active radical scavenger (IC₅₀ = 0.037 mg/mL), followed by T. capitata, whereas M. piperita displayed weaker activity. PCA confirmed that phenolic monoterpenes drive both antimicrobial and antioxidant potency, while oxygenated terpenes and sesquiterpenes contribute more selectively. ADMET predictions indicated generally favorable absorption and low toxicity, although o-cymene and carvacrol presented potential safety concerns. Molecular docking revealed α-terpinyl acetate as the most versatile ligand, with strong binding to bacterial, fungal, and oxidative enzymes, whereas other compounds exhibited more selective affinities. Collectively, these findings highlight the potential of Moroccan EOs, particularly T. capitata and L. nobilis, as promising natural alternatives to synthetic antimicrobial and antioxidant agents.

Despite the prevalence of fucosylated IgG in plasma, specific IgGs with low core fucosylation sporadically emerge in response to virus infections and blood cell alloantigens. This low fucosylation of IgG is implicated in the pathogenesis of SARS-CoV-2 and dengue infections. In COVID-19, the presence of IgGs with low core fucosylation (afucosylated IgGs) targeting spike protein predicts disease progression to a severe form and actively mediates this progression. This study reveals that SARS-CoV-2 infection of megakaryocytes promotes the generation of pathogenic afucosylated anti-spike IgGs, leading to outcomes, such as pulmonary vascular thrombosis, acute lung injury, and mortality in FcγRIIa-transgenic mice. Platelets from mice injected with virus-infected human megakaryocytes express significant activation biomarkers, indicating a direct link between the immune response and platelet activation. Mice injected with virus-infected human megakaryocytes demonstrate an elevated rate of thrombus formation induced by FeCl₃ (4%) and a reduction in bleeding time, emphasizing the intricate interplay of viral infection, immune response, and hemostatic complications. Treatment with inhibitors targeting FcγRIIa, serotonin, or complement anaphylatoxins of mice injected with spike-expressing MKs successfully prevents observed platelet activation, thrombus formation, and bleeding abnormalities, offering potential therapeutic strategies for managing severe outcomes associated with afucosylated IgGs in COVID-19 and related disorders.