Journal of Asian Natural Products Research最新文献

Seven flavanol derivatives, including three biflavanoids (1-3), two flavonoids (4 and 5), and two spirobiflavonoids (6 and 7), were isolated from the bark of Nothotsuga longibracteata. The structure of the undescribed compound 1 was elucidated based on HR-ESIMS, NMR spectroscopy, and electronic circular dichroism (ECD) calculations. All isolated flavanol derivatives were screened for their antioxidant capacity to scavenge DPPH and ABTS⁺.

Compound FLZ has neuroprotective effects on Parkinson's disease (PD), while the precise mechanism remains unclear. In this study, we found that FLZ decreased PTEN/Akt activity in LPS-challenged BV2 cells. Neuroinflammatory responses suppressed by FLZ were abolished when PTEN or Src was inhibited. Additionally, FLZ weakened the interactions of Src and PTEN, and attenuated Src phosphorylation once PETN was inhibited, but failed to decrease PTEN phosphorylation when Src was silenced. Eventually, we elaborated that FLZ bound to Src directly and inhibited its activity. Collectively, FLZ attenuated neuroinflammation through inhibiting Src/PTEN/Akt pathway, paving the way for clinical use of FLZ to treat PD.

Three new terpenoid derivatives (1S,6R,7S)-hydrobenzosydowic acid (1), (1 R,6S,7S)-hydrobenzosydowic acid (2), and (7 R,10R)-11-dehydroxy-iso-10-hydroxysydowic acid (3), along with the known analogues (S)-2-(1-(4-nitrobenzoyl)pyrrolidine-2-carboxamido)benzoic acid (4) and trihydroxybutyl ester of 4-carboxydiorcinol (5) were isolated from the deep-sea-derived fungus Aspergillus sydowii DFFSCS007. Their structures were determined by spectroscopic analysis. Compound 4 with a nitrobenzene group was isolated from nature for the first time. The antibacterial activities of 1-5 and cytotoxicity of 1-3 were also evaluated.

Curcumin has diverse biological functions, especially antioxidant and anti-inflammatory properties, but clinical trials have been hindered by its low bioavailability and pharmacokinetic properties. To achieve therapeutic efficacy, understanding curcumin's in vivo metabolism is crucial. We reviewed current research on curcumin metabolism in PubMed, Google Scholar, and CNKI. This article outlines curcumin's metabolic processes in the body via oral and intravenous injection. It suggests that upon entering the human body, curcumin may undergo oxidation, reduction, binding, and microbial community influence.

Three meroterpenoids, including one new compound, ranhuadujuanine E (1), one new natural product, methyl (E)-3-(3,7-dimethylocta-2,6-dien-1-yl)-2,4-dihydroxy-6-methylbenzoate (2), and one known compound, ranhuadujuanine D (3), along with two known sesquiterpenoids (4-5) were isolated from Rhododendron racemosum. Their structures were elucidated on the basis of extensive spectroscopic analysis, and the absolute configuration of C-6' in compound 1 was assigned by using Snatzke's method. Compounds 1-3 had inhibitory effects on LPS-induced NO release in RAW264.7 cells.

Colorectal cancer remains a global health challenge, prompting the exploration of natural compounds for treatment. Annona reticulata shows promise as a source of activity biomolecules. This study analyzed the dynamics, molecular docking and ADMET properties of the extract, highlighting interaction with inflammatory protein. Key findings include compounds with binding energies of -9.61 and -9.01 kcal/mol for 5fia and 7cx2 receptors. Simulations over 100 ns assessed RMSD, RMSF, SASA, and H-bonding, confirming stability and favorable ADME/toxicity profiles. These results highlight A. reticulata as a promising candidate for developing anti-inflammatory and anticancer drugs.[Figure: see text].

This study investigated inhibiting mechanisms of Urolithin B (Uro B) on macrophage M1 polarization. Uro B (50 μM) could inhibit the PGE2, COX-2, NO, iNOS, TNF-α, IL-1β and IL-6 levels compared with model group (P < 0.05) as well as the CD86 and F4/80 expression. The miR155-5p overexpression could increase the p38 MAPK, JNK, ERK mRNA activities (P < 0.05), Uro B (50 μM) could reverse changes in these indicators (P < 0.05). Moreover, Uro B (50 μM) could inhibit the TLR4, Src, IκBα, NF-κBp65 and their phosphorylated protein expression (P < 0.05). Therefore, Uro B may inhibit macrophage M1 polarization via miR155-5p mediated MAPK/NF-кB pathway.