The epidermal growth factor receptor (EGFR), a protein located on the cell surface, belongs to the tyrosine kinase family and plays a crucial role in cell development and proliferation. Abnormal expression or mutations in the EGFR gene can lead to non–small cell lung cancer. Although established EGFR inhibitors have been effective in the treatment of cancer, they are associated with several side effects. As a result, there is an urgent need to develop novel EGFR inhibitors that can effectively target the receptor while causing no adverse side effects. In this study, a series of bis(6‐amino‐1,3‐dimethylpyrimidine‐2,4(1H,3H)‐dione derivatives was synthesized in water at room temperature without the use of any catalyst, and pharmaceutical properties are investigated. Computational methods, including density functional theory (DFT), molecular docking, and molecular dynamics (MD), were utilized to investigate the chemical properties, drug‐like characteristics, and anticancer potential of the molecule. Quantum chemical calculations indicated that the molecules are relatively stable and exhibit significant electrophilic properties. The analysis of HOMO‐LUMO contour maps was conducted to illustrate charge density distributions that may be associated with biological activity. Docking studies with EGFR enzymes indicated that all compounds demonstrated favorable binding affinities, with docking scores ranging from −4.412 to −6.158 kcal/mol. Particularly, Compound 3f, with an energy of −6.158 kcal/mol, showed the best binding affinity, outperforming the native ligand, which had a docking score of −5.076 kcal/mol. The stability of the EGFR‐3f complex is significantly enhanced by the formation of five conventional hydrogen bonds and one carbon–hydrogen bond in ligand–protein interactions. MD simulations, which included analyses such as root mean square deviation (RMSD), root mean square fluctuation (RMSF), radius of gyration (rGyr), molecular surface area (MolSA), and polar surface area (PSA), were conducted on the EGFR‐3f complex. It was found that the EGFR‐3f complex is stable, and the results show that Compound 3f has a strong interaction with the target enzyme.

To explore the peculiarities of neutrophil motility, two models of chemoattraction were created: a horizontal model, where a container with bacterial chemoattractant was attached laterally to the endotheliocyte monolayer, and a vertical model, simulating a pyemic focus in the lower part of the modified Boyden chamber. Low‐molecular weight product secretion and/or degradation of Enterococcus faecalis caused “disorientations” of neutrophil migration with hyperproduction reactive oxygen species (ROS) by immune cells, while Proteus mirabilis inhibited both migration of most neutrophils and the production of ROS by them, while the activity of the remaining uninhibited neutrophils increased. Neutrophils generated ROS during migration, especially actively in the case of a large number of mobile cells (under stimulation with low‐molecular weight product secretion and/or degradation of Enterococcus faecalis and Escherichia coli). Using high‐resolution microscopy, it was shown that low‐activity neutrophils cause changes in the morphology of endothelial cells during migration more than high‐activity neutrophils. In the vertical migration model, the morphology of endothelial cells significantly changed during neutrophils diapedesis. It was observed that space between endothelial cells was increased (especially in the case of neutrophil swarming).

Multidrug‐resistant (MDR) pathogens such as Escherichia coli, Pseudomonas aeruginosa, and Enterobacter cloacae have become a global health threat. Drug repositioning or repurposing has become a viable solution to combat the threat posed by MDR pathogens. A strategic approach to identifying potential new candidates as future molecular drug targets is presented in this study. Fifty proteins critical for virulence during systemic infection were selected from the entire genomes of MDR E. coli MB641 and Enterobacter cloacae MB649, which were isolated from infected orthopaedic implants. Interaction networks were built using the STRING database to visualise the positioning of the selected virulence proteins in the network space and support their suitability for therapeutic targeting. The two significant virulence proteins FliG and FlhA, which were discovered by network analysis, were suggested as prospective treatment targets. To test the stability of the protein–drug complexes, the preidentified proteins were docked with 10 marketed antibacterial drugs and six phytochemicals. Amikacin, rifampicin, streptomycin, and tetracycline had the best binding interaction and stability for both strains, according to our findings. Molecular dynamic simulation studies were performed for amikacin and catechin at 100 ns. Both hydrophobic and hydrophilic stable contacts were seen in the active sites of amikacin and catechin with new chemical structures. Structural and conformational analysis of the docked protein‐ligand complex was done by RMSD which showed stability of the amikacin and catechin complexes, whereas RMSF showed conformational changes. Based on the results, we propose the phytochemical catechin as the best theoretical lead, which may be further experimentally studied for selective inhibition.

Infertility is a condition where a male or female is unable to achieve pregnancy through at least 1 year of regular, unprotected sexual intercourse. There are several known causes and risk factors associated with infertility. The gut microbiota is a complex community of trillions of microorganisms living in the gut. Due to modern lifestyle changes, such as dietary habits, physical inactivity, and increasing antibiotic use, the diversity and composition of these microbes may change in a detrimental manner. Dysbiosis or an imbalance of the gut microbiota compared to a normal composition can lead to various abnormalities, such as obesity, Alzheimer’s, metabolic disorders, and infertility. This review will cover the factors influencing gut microbiota composition, the mechanisms by which gut microbiota contributes to infertility in men and women, the effects of gut microbiota on problems that may arise during pregnancy, and therapeutic methods for diseases caused by dysbiosis of the gut microbiota.

Neisseria meningitidis is the most frequent cause of bacterial meningitis and is one of the few bacterial pathogens that can breach the blood-brain barrier (BBB). The 37/67 kDa laminin receptor (LamR) was previously identified as a receptor mediating meningococcal binding to rodent and human brain microvascular endothelial cells, which form part of the BBB. The meningococcal surface proteins PorA and PilQ were identified as ligands for this receptor. Subsequently, the fourth extracellular loop of PorA (PorA-Loop4) was identified as the LamR-binding moiety. Here, we show that PorA-Loop4 targets the 37 kDa laminin receptor precursor (37LRP) on the cell surface by demonstrating that deletion of this loop abrogates the recruitment of 37LRP under meningococcal colonies. Using a circularized peptide corresponding to PorA-Loop4, as well as defined meningococcal mutants, we demonstrate that host cell interaction with PorA-Loop4 results in perturbation of p-CDK4 and Cyclin D1. These changes in cell cycle control proteins are coincident with cellular responses including inhibition of cell migration and a G1 cell cycle arrest. Modulation of the cell cycle of host cells is likely to contribute to the pathogenesis of meningococcal disease.

Purpose. To observe the protective effect of homeobox D10 (HOXD10) on acute kidney injury (AKI) by regulating PI3K/AKT signaling pathway is the purpose of this study.Methods. 30 rats were randomly divided into three groups: blank control group, model group, and HOXD10 interference group. The kidney function indexes, HOXD10 protein expression, histopathological features, tubulointerstitial injury, and PI3K and AKT protein expression levels of the three groups were analyzed. Results. Compared with the blank control group, the kidney weight, BUN and SCr in model group increased significantly, and TIL score was higher ( P > 0.05 ). The expression of HOXD10 in model group and HOXD10 interference group were higher than blank control group, and the expression of HOXD10 in HOXD10 interference group was lower than model group ( P < 0.05 ). After we administered HOXD10 blocker to AKI rats, pathological sections by HE staining showed that the kidney tissue damage was significantly reduced compared with the model group, and the expression levels of BUN and SCr in kidney tissue decreased, and the TIL score decreased. The expression of p-PI3K and p-AKT decreased after kidney injury. Compared with the model group, the phosphorylation levels of PI3K and AKT in HOXD10 interference group were significantly increased ( P < 0.05 ). Conclusion. Downregulation of HOXD10 can play a protective role on AKI by activating PI3K/AKT signaling pathway, which can reduce tubulointerstitial injury and improve kidney function.

Supplementing amino acids was proven to relieve fatigue caused by exercise. This study explored the antifatigue effects of compound amino acid capsules (CAAC) on rats undergoing the forced swimming test (FST). CAAC augmented the endurance of FST in rats and alleviated the damage of skeletal muscle tissue and reduced the content of biochemical indicators in the serum. Furthermore, CAAC prevented skeletal muscle dysfunction in FST rats by modulating inflammation and oxidation reactions. After the treatment with CAAC, apoptosis and apoptosis-related protein and p-p65 were weakened, while the levels of SIRT1 and SIRT1/PGC-1α/Nrf2 pathway-related proteins were enhanced. The antifatigue properties of CAAC were associated with its antioxidant and anti-inflammatory capabilities, which were realized by activating the SIRT1/PGC-1α/Nrf2 pathway.

Confocal micrograph showing Canid herpesvirus 1 (red) bound to MDCK cells, and DAPI-stained nuclei (blue). Primary amines of viral glycoproteins were labelled with Alexa Fluor succinimidyl esters 568 dye. For further details, readers are referred to the article by Eisa et al. on p. e13398 of this issue.

Previously, we found that Ureaplasma parvum internalised into HeLa cells and cytosolic accumulation of galectin-3. U. parvum induced the host cellular membrane damage and survived there. Here, we conducted vesicular trafficking inhibitory screening in yeast to identify U. parvum vacuolating factor (UpVF). U. parvum triggered endoplasmic reticulum (ER) stress and upregulated the unfolded protein response-related factors, including BiP, P-eIF2 and IRE1 in the host cells, but it blocked the induction of the downstream apoptotic factors. MicroRNA library screening of U. parvum-infected cells and UpVF-transfected cells identified miR-211 and miR-214 as the negative regulators of the apoptotic cascade under ER stress. Transient expression of UpVF induced HeLa cell death with intracellular vacuolization; however, some stable UpVF transformant survived. U. parvum-infected cervical cell lines showed resistance to actinomycin D, and UpVF stable transformant cell lines exhibited resistance to X-ray irradiation, as well as cisplatin and paclitaxel. UpVF expressing cervical cancer xenografts in nude mice also acquired resistance to cisplatin and paclitaxel. A mycoplasma expression vector based on Mycoplasma mycoides, Syn-MBA (multiple banded antigen)-UpVF, reduced HeLa cell survival compared with that of Syn-MBA after 72 hr of infection. These findings together suggest novel mechanisms for Ureaplasma infection and the possible implications for cervical cancer malignancy. TAKE AWAYS: • Ureaplasmal novel virulence factor, UpVF, was identified. • UpVF triggered ER stress but suppressed apoptotic cascade via miR-211 and -214. • UpVF conferred resistance to anticancer treatments both in vivo and in vitro. • Dual expression of MBA and UpVF in JCVI-syn3B showed host cell damage.

Predatory interactions among microbes are major evolutionary driving forces for biodiversity. The fungivorous amoeba Protostelium aurantium has a wide fungal food spectrum including foremost pathogenic members of the genus Candida. Here we show that upon phagocytic ingestion by the amoeba, Candida parapsilosis is confronted with an oxidative burst and undergoes lysis within minutes of processing in acidified phagolysosomes. On the fungal side, a functional genomic approach identified copper and redox homeostasis as primary targets of amoeba predation, with the highly expressed copper exporter gene CRP1 and the peroxiredoxin gene PRX1 contributing to survival when encountered with P. aurantium. The fungicidal activity was largely retained in intracellular vesicles of the amoebae. Following their isolation, the content of these vesicles induced immediate killing and lysis of C. parapsilosis in vitro. Proteomic analysis identified 56 vesicular proteins from P. aurantium. Although completely unknown proteins were dominant, many of them could be categorised as hydrolytic enzymes targeting the fungal cell wall, indicating that fungal cell wall structures are under selection pressure by predatory phagocytes in natural environments. TAKE AWAY: The amoeba Protostelium aurantium feeds on fungi, such as Candida parapsilosis. Ingested yeast cells are exposed to reactive oxygen species. A copper exporter and a peroxiredoxin contribute to fungal defence. Yeast cells undergo intracellular lysis. Lysis occurs via a cocktail of hydrolytic enzymes from intracellular vesicles.