Four new resorcinol derivatives with neuroprotective activities from Xylaria nigripes

Could Mushrooms' Secondary Metabolites Ameliorate Alzheimer Disease? A Computational Flexible Docking Investigation

Herein, we highlight the significance of molecular modeling approaches prior to in vitro and in vivo studies; particularly, in diseases with no recognized treatments such as neurological abnormalities. Alzheimer disease is a neurodegenerative disorder that causes irreversible cognitive decline. Toxicity and ADMET studies were conducted using the Qikprop platform in Maestro software and Discovery Studio 2.0, respectively, to select the promising skeletons from more than 45 reviewed compounds isolated from mushrooms in the last decade. Using rigid and flexible molecular docking approaches such as induced fit docking (IFD) in the binding sites of β-secretase (BACE1) and acetylcholine esterase (ACHE), promising structures were screened through high precision molecular docking compared with standard drugs donepezil and (2E)-2-imino-3-methyl-5,5-diphenylimidazolidin-4-one (OKK) using Maestro and Cresset Flare platforms. Molecular interactions, binding distances, and RMSD values were measured to reveal key interactions at the binding sites of the two neurodegenerative enzymes. Analysis of IFD results revealed consistent bindings of dictyoquinazol A and gensetin I in the pocket of 4ey7 while inonophenol A, ganomycin, and fornicin fit quite well in 4dju demonstrating binding poses very close to native ligands at ACHE and BACE1. Respective key amino acid contacts manifested the least steric problems according to their Gibbs free binding energies, Glide XP scores, RMSD values, and molecular orientation respect to the key amino acids. Molecular dynamics simulations further confirmed our findings and prospected these compounds to show significant in vitro results in their future pharmacological studies.

A pair of new chromone enantiomers from Xylaria nigripes

A pair of new chromone derivative enantiomers, (+)-xylarichromone A (1a) and (-)-xylarichromone A (1b), were isolated from the solid fermentation of Xylaria nigripes. The planar structure of 1 was determined by extensive NMR spectroscopic data, and its absolute configuration was assigned by comparison the ECD spectra with the known chromone derivatives. Compound 1 was the first chromone derivative reported from this medicinal fungus. The neuroprotective effects of 1 against oxygen and glucose deprivation (OGD) induced pheochromocytoma-12 cells (PC12) injury was investigated.

Two New Compounds from the Fungus Xylaria nigripes

In the process of discovering more neural-system-related bioactive compounds from Xylaria nigripes, xylariamino acid A (1), a new amino acid derivative, and a new isovaleric acid phenethyl ester (2) were isolated and identified. Their structures and absolute configurations were determined by analyses of IR, HRESIMS, NMR spectroscopic data, and gauge-independent atomic orbital (GIAO) NMR calculation, as well as electronic circular dichroism (ECD) calculation. The isolated compounds were evaluated for their neuroprotective effects against damage to PC12 cells by oxygen and glucose deprivation (OGD). Compounds 1 and 2 can increase the viability of OGD-induced PC12 cells at all tested concentrations. Moreover, compound 2 (1 μmol L^-1) can significantly reduce the percentage of apoptotic cells.

New cytochalasans from an endophytic Xylaria species associated with Costa Rican Palicourea elata (Rubiaceae)

Four new leucine-derived cytochalasans, possessing a 5,6,5,8-ring (1) and a 5,6,11-ring core (2-4), were isolated from a cultivated endophytic fungus Xylaria sp. strain WH2D4 (Xylariaceae). This fungus was isolated from leaves of the neotropical tree species Palicourea elata (Sw.) Borhidi (Rubiaceae) collected in Costa Rica. The chemical structures were determined by employing IR, MS as well as 1D- and 2D-NMR experiments. The stereochemistry at C-15 of compound 4 was determined by quantum calculations. The isolated compounds did not affect germination and growth of Trichoderma reesei and the opportunistic human fungal pathogen T. longibrachiatum.

The mechanism of Lingze tablets in the treatment of benign prostatic hyperplasia based on network pharmacology and molecular docking technology

Lingze tablets has been used as a drug in the treatment of kidney deficiency-dampnes shea-stasis type benign prostatic hyperplasia (BPH) in Traditional Chinese Medicine, and it was found effective for BPH treatment. We aimed to investigate the mechanism of the Lingze tablets in the treatment of BPH through the network pharmacology and molecular docking technology. The active compounds of Lingze tablets were retrieved from the TCMSP, BATMAN-TCM and ETCM databases. The ADME of active compounds was screened for Swiss target prediction, and the targets of the active compounds were predicted. DisGeNET, Genecards and OMIM were used to obtain the disease targets of BPH, and the targets of Lingze tablets in the treatment of BPH were obtained by venny2.1. String platform and cytoscape softwares were used to construct the PPI network. Go enrichment analysis and KEGG signal pathway analysis were analysed by mediascape. The 'component-target-pathway' networks diagram was constructed by the cytoscape software. Molecular docking was carried out by autodock software. Lingze tablets could serve as a drug for BPH treatment by regulating SRC, MAPK1, PIK3CA, JAK2 and other disease targets, intervening in biological processes such as cell migration, cell activity, cytokine secretion, protein phosphorylation, MAPK, transferase activity and PI3K/AKT signalling pathways.