1.Antibacterial Activity of Stilbenes Isolated From Reynoutria japonica Against Vancomycin-resistant Enterococci: An In Vitro and In Silico Approach
Karishma AHMED ; Khizar Abdullah KHAN ; Sultan Mehtap BÜYÜKER ; Muhammad Arshad ZAMAN ; Atif Ali Khan KHALIL ; Syed Babar JAMAL ; Muhammad FAHEEM ; Mi-Jeong AHN ; Mutiullah KHATTAK
Natural Product Sciences 2026;32(1):104-105
2.Fragaria Indica ethanolic extracts: bioactive compounds identification, ADMET analysis and putative inhibitors of bla-TEM beta-lactamase from foodborne bacterial pathogens
Abdullah K. ; Rahman H. ; Tabassum T. ; Sadiq A. ; Alzahrani F.M. ; Alzahrani K.J. ; Alsharif K.A.
Tropical Biomedicine 2026;43(No. 1):132-141
Fragaria indica stem, leaf, and root extract was used to assess the antimicrobial activity against bla-TEM
beta-lactamase producing Shigella flexneri, Salmonella typhi, and Escherichia coli. Ethanolic extracts
of F. indica leaves exhibited a maximum zone of inhibition of 20 ± 1.2 mm (p < 0.001), 18 ± 1.4 mm
(p < 0.001), and 16 ± 1.5 mm (p < 0.001) against E. coli, S. flexneri, and S. typhi, respectively. To identify
different compounds, the bioactive ethanolic leaf extracts were further processed for HPLC, GC-MS,
ADMET, and docking analysis. In the ethanolic leaf extract, 19 phenolic compounds were identified
in HPLC analysis. Three phenolic compounds, including Isorhamnetin-3-rutinoside, 5, 7-Dihydroxy-4’
-methoxyflavone, and Luteolin, were for the first time reported in F. indica. In GC-MS analysis, sixteen
compounds were identified. From the literature search, among the identified compounds, AlphaHimachalene, 1,3-Diphenyl-1-((trimethylsilyl)oxy)-1(Z)-heptene, 1H-Benzocycloheptene, Bicyclo[5.2.0]
nonane, cis-1,1,3,4-Tetramethylcyclopentane, Bicyclo[2.2.2]octane-cis-2,3-diyl Carbonate, BetaHimachalene and 2-methylene-4,8,8-trimethyl-4-vinyl were reported for the first time in F. indica. Two
compounds, including Alpha-Himachalene and Bicyclo[2.2.2]octane-cis-2,3-diyl carbonate, having
good water solubility, drug likeness, and medicinal characteristics, were selected for docking analysis.
Docking of Alpha-Himachalene and Bicyclo[2.2.2]octane-cis-2,3-diyl carbonate showed interaction
with Pro-26, Phe-22, and Ala-23 residues of bacterial bla-TEM beta-lactamase. Similarly, Bicyclo[2.2.2]
octane-cis-2,3-diyl carbonate interacts with amino acid residues of Ala-235 and Ser-233 of bla-TEM
beta-lactamase. Further studies will help to characterize the anti-infective compounds against bla-TEM
producing foodborne bacterial pathogens.
4.Antibacterial Activity of Stilbenes Isolated From Reynoutria japonica Against Vancomycin-resistant Enterococci: An In Vitro and In Silico Approach
Karishma AHMED ; Khizar Abdullah KHAN ; Sultan Mehtap BÜYÜKER ; Muhammad Arshad ZAMAN ; Atif Ali Khan KHALIL ; Syed Babar JAMAL ; Muhammad FAHEEM ; Mi-Jeong AHN ; Mutiullah KHATTAK
Natural Product Sciences 2025;31(4):299-308
Enterococcus species are Gram-positive cocci normally found in the gut but have emerged as opportunistic pathogens in healthcare settings, with rising multidrug resistance, particularly vancomycin-resistant Enterococci (VRE) posing major therapeutic challenges. This study evaluated the antibacterial and synergistic effects of plant-derived stilbenes from Reynoutria japonica against clinical VRE isolates. Ten clinical Enterococcus faecalis isolates were identified using standard morphological, biochemical, and Gram-staining methods, and antibiotic susceptibility testing. The antibacterial activity of polydatin, resveratroloside, and trans-resveratrol was assessed by agar well diffusion, and evaluation of minimum inhibitory concentrations (MICs) and evaluation of bactericidal activity concentrations (MBCs), with synergistic effects tested in combination with vancomycin.Molecular docking was performed with DapF, vanA, and gelE proteins. All isolates were resistant to vancomycin, ampicillin, imipenem, gentamicin, and ciprofloxacin but sensitive to linezolid. All three stilbenes displayed antibacterial activity. Notably, trans-resveratrol was the most active compound, with a MIC value of 0.156 mM and bactericidal activity (an MBC value equal to the MIC). Furthermore, all compounds exhibited synergistic effects when combined with vancomycin. Phytochemical analysis confirmed these stilbenes as major constituents in the root extract of R. japonica. Molecular docking studies revealed strong binding affinities of the compounds to key virulence and resistance-associated proteins (DapF, VanA, and GelE). These results indicate that transresveratrol and related stilbenes are promising candidates for development as alternative or adjunct therapeutic agents against VRE infections. Additionally, this study substantiates the traditional use of R. japonica as a source of bioactive antimicrobial compounds.
5.Recent advances in bacterial outer membrane vesicles: Effects on the immune system, mechanisms and their usage for tumor treatment.
Shuo XIANG ; Arshad KHAN ; Qiufang YAO ; Dong WANG
Journal of Pharmaceutical Analysis 2024;14(12):101049-101049
Tumor treatment remains a significant medical challenge, with many traditional therapies causing notable side effects. Recent research has led to the development of immunotherapy, which offers numerous advantages. Bacteria inherently possess motility, allowing them to preferentially colonize tumors and modulate the tumor immune microenvironment, thus influencing the efficacy of immunotherapy. Bacterial outer membrane vesicles (OMVs) secreted by gram-negative bacteria are nanoscale lipid bilayer structures rich in bacterial antigens, pathogen-associated molecular patterns (PAMPs), various proteins, and vesicle structures. These features allow OMVs to stimulate immune system activation, generate immune responses, and serve as efficient drug delivery vehicles. This dual capability enhances the effectiveness of immunotherapy combined with chemotherapy or phototherapy, thereby improving anticancer drug efficacy. Current research has concentrated on engineering OMVs to enhance production yield, minimize cytotoxicity, and improve the safety and efficacy of treatments. Consequently, OMVs hold great promise for applications in tumor immunotherapy, tumor vaccine development, and drug delivery. This article provides an overview of the structural composition and immune mechanisms of OMVs, details various OMVs modification strategies, and reviews the progress in using OMVs for tumor treatment and their anti-tumor mechanisms. Additionally, it discusses the challenges faced in translating OMV-based anti-tumor therapies into clinical practice, aiming to provide a comprehensive understanding of OMVs' potential for in-depth research and clinical application.
6.Can the bone marrow harvest volume be reduced safely in hematopoietic stem cell transplantation with pediatric sibling donors?
Awatif ALANAZI ; Amer NADEEM ; Khawar SIDDIQUI ; Ali ALAHMARI ; Ibrahim GHEMLAS ; Abdullah ALJEFRI ; Hawazen ALSAEDI ; Saadiya KHAN ; Mouhab AYAS
Blood Research 2023;58(1):28-35
Background:
Reduced harvest volumes in pediatric donors appear to have the potential to reduce donor-associated risks while maintaining engraftment in recipients; however, the allowable harvest volume reduction remains undefined.
Methods:
We retrospectively analyzed the data pairs of 553 bone marrow (BM) harvests from pediatric (age at harvest <18 yr) sibling donors and clinical outcomes of 553 pediatric (age at infusion <14 yr) transplant-naïve recipients to assess the optimal BM harvest volume needed from pediatric donors to obtain the desired CD34+ cell count (≥3.0×10 6 cells per kg of recipient weight), and to study its impact on the clinical outcomes of transplantation in pediatric recipients.
Results:
The minimum desired CD34+ cell count of ≥3.0×10 6 per kg of recipient weight was achieved for 506 (95.3%) of donor-recipient pairs. The median CD34+ cell yield was 6.4×10 6 per kg of recipient weight (range, 1.2‒33.8×10 6 ) in donors younger than 5 years old at harvest, 4.7×10 6 (range, 0.3‒28.5×10 6 ) in donors aged 5‒10 years and 2.1×10 6 range, 0.3‒11.3×10 6 ) in donors older than 10 years (P <0.001).
Conclusion
The infused CD34+ cell dose (×10 6 cells/kg of recipient weight) had no impact on GRFS; however, a CD34+ cell dose of >7×10 6 cells/kg of recipient weight did not improve hematopoietic recovery
7.A Mini-review on the Determinants and Risk Factors of Adolescent Pregnancy in Developing Countries
Shameer Khan Sulaiman ; Idayu Badilla Idris ; Rozita Hod ; Nik Nairan Abdullah ; Rafidah Hod ; Nadia Aqilla Shamsusah
Malaysian Journal of Medicine and Health Sciences 2023;19(No.3):341-348
Pregnant adolescents have been shown to have a higher incidence of health and non-health-related complications
that affect both mothers and infants. These include increased risk of pregnancy-related diseases such as anemia and
pre-eclampsia, preterm and low-birth-weight babies, as well as other social consequences such as educational and
financial difficulties. This mini review evaluates selected articles which explain the attitudes, knowledge, behavior
and other risk factors associated with pregnancy among adolescents in developing countries. It also revealed that
inadequate knowledge among adolescents about reproductive and sexual health, other social, cultural and peer
influences, parenting values, and poor financial and educational status were factors that contribute to adolescent
pregnancy. Likewise, a lack of support from parents, educators and healthcare workers had negative impacts on
healthy sexual behavior among adolescents, which may ultimately lead to adolescent pregnancy. We conclude that
the factors discussed in this review need to be evaluated and taken into consideration by policymakers and healthcare workers when formulating strategies to prevent pregnancies among adolescents.
8.Awake Surgery for Lesional Epilepsy in Resource-Limited Settings: Case Report and Review of Literature
Mohammad Hamza BAJWA ; Syeda Amrah HASHMI ; Abdullah NISAR ; Muhammad Waqas BAQAI ; Saqib Kamran BAKHSHI ; Muskaan Abdul QADIR ; Faraz SHAFIQ ; Syed Ather ENAM
Brain Tumor Research and Treatment 2023;11(4):289-294
Epilepsy surgery is a well-established treatment for drug-resistant epilepsy, with awake craniotomy being used in certain cases to remove epileptogenic foci while preserving crucial brain functions. We are presenting the first reported case from Pakistan of a 19-year-old woman who underwent awake epilepsy surgery to treat cortical dysplasia. She had a history of generalized tonic-clonic seizures since her childhood and was referred to our clinic due to an increase in seizure frequency. EEG and MRI identified the epileptogenic focus in the right parieto-temporal region. The patient underwent a neuro-navigation guided awake craniotomy and an excision of the epileptogenic focus in the right parieto-temporal region. The procedure was carried out using a scalp block and dexmedetomidine for conscious sedation, enabling the patient to remain awake throughout the surgery. Intraoperative mapping and electrocorticography were used for complex multidisciplinary care. Post-resection corticography showed no spikes along the resected margins. The patient was discharged without any complications and remained free of symptoms a year after the surgery. Awake epilepsy surgery is a viable option for removing epileptogenic foci while preserving vital cognitive functions. However, it is seldom used in low- and middle-income countries such as Pakistan. The successful outcome of this case underscores the need for greater awareness and availability of epilepsy surgery in resource-limited settings. Cost-effective measures, such as using small subdural strips for intraoperative localization, can be implemented.
9.Hypothetical protein predicted to be tumor suppressor: a protein functional analysis
Md. Abdul KADER ; Akash AHAMMED ; Md. Sharif KHAN ; Sheikh Abdullah AL ASHIK ; Md. Shariful ISLAM ; Mohammad Uzzal HOSSAIN
Genomics & Informatics 2022;20(1):e6-
Litorilituus sediminis is a Gram-negative, aerobic, novel bacterium under the family of Colwelliaceae, has a stunning hypothetical protein containing domain called von Hippel-Lindau that has significant tumor suppressor activity. Therefore, this study was designed to elucidate the structure and function of the biologically important hypothetical protein EMK97_00595 (QBG34344.1) using several bioinformatics tools. The functional annotation exposed that the hypothetical protein is an extracellular secretory soluble signal peptide and contains the von Hippel-Lindau (VHL; VHL beta) domain that has a significant role in tumor suppression. This domain is conserved throughout evolution, as its homologs are available in various types of the organism like mammals, insects, and nematode. The gene product of VHL has a critical regulatory activity in the ubiquitous oxygen-sensing pathway. This domain has a significant role in inhibiting cell proliferation, angiogenesis progression, kidney cancer, breast cancer, and colon cancer. At last, the current study depicts that the annotated hypothetical protein is linked with tumor suppressor activity which might be of great interest to future research in the higher organism.
10.Glutathione (GSH) improves sperm quality and testicular morphology in streptozotocin-induced diabetic mice.
Fathiah ABDULLAH ; Mohamed Noor KHAN NOR-ASHIKIN ; Renu AGARWAL ; Yuhaniza Shafinie KAMSANI ; Mastura ABD MALEK ; Nor Salmah BAKAR ; Aqila-Akmal MOHAMMAD KAMAL ; Mimi-Sophia SARBANDI ; Nor-Shahida ABDUL RAHMAN ; Nurul Huda MUSA
Asian Journal of Andrology 2021;23(3):281-287
Diabetes mellitus (DM) is known to cause reproductive impairment. In men, it has been linked to altered sperm quality and testicular damage. Oxidative stress (OS) plays a pivotal role in the development of DM complications. Glutathione (GSH) is a part of a nonenzymatic antioxidant defense system that protects lipid, protein, and nucleic acids from oxidative damage. However, the protective effects of exogenous GSH on the male reproductive system have not been comprehensively examined. This study determined the impact of GSH supplementation in ameliorating the adverse effect of type 1 DM on sperm quality and the seminiferous tubules of diabetic C57BL/6NTac mice. GSH at the doses of 15 mg kg


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