The roots of Platycodon grandiflorus (Jacq.) A. DC. (Campanulaceae), known as Platycodi Radix (PR), have long been used as a traditional medicine for respiratory ailments and for relieving chest oppre Show more
The roots of Platycodon grandiflorus (Jacq.) A. DC. (Campanulaceae), known as Platycodi Radix (PR), have long been used as a traditional medicine for respiratory ailments and for relieving chest oppression, a symptom associated with qi stagnation and emotional imbalance resembling depressive states. However, the molecular mechanisms underlying this ethnopharmacological effect and neuroplastic signaling remain to be elucidated. This study aimed to investigate the antidepressant-like activities of PR and its triterpenoid saponins, platycodin D (PD) and platycodin D2 (PD2), and their underlying molecular mechanisms. In a chronic restraint stress (CRS) mouse model, antidepressant efficacy was evaluated using behavioral assessments, including open field tests and forced swimming tests. Hippocampal microarray and pathway enrichment analyses, as well as the compound combination-oriented natural product database unified terminology (COCONT) database, were used to explore signaling pathways and active components, respectively. The molecular mechanisms underlying brain-derived neurotrophic factor (BDNF) expression and secretion were investigated in N2a cells and hippocampal tissues. The activation of BDNF-related signaling pathways was examined using neurite outgrowth assays, quantitative PCR, immunoblotting, and immunofluorescence analysis. PR extract (PRE), PD, and PD2 significantly improved depressive-like behavioral deficits induced by CRS and restored the expression of hippocampal neuroplasticity markers, including BDNF, neurofilament light, and PSD95. These effects were accompanied by enhanced activities in ERK/cAMP-response element binding protein (CREB) and Akt/mechanistic target of rapamycin (mTOR) signaling pathways. These compounds promoted neurite outgrowth and triggered α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs)-dependent Ca PR and its triterpenoid saponins, PD and PD2, could alleviate stress-induced depressive symptoms and modulate BDNF-centered neuroplasticity signaling, supporting their potential relevance as phytotherapeutic candidates for depressive disorders. Show less
Prosopis cineraria is traditionally used to enhance cognitive function and manage mental disorders. Its stem bark is valued in ethnomedicine, but its potential anti-Alzheimer's disease (AD) effects ar Show more
Prosopis cineraria is traditionally used to enhance cognitive function and manage mental disorders. Its stem bark is valued in ethnomedicine, but its potential anti-Alzheimer's disease (AD) effects are scientifically unexplored. This research has examined the neuroprotective effects of the ethyl acetate fraction of P. cineraria bark (Pc-EA) against AlCl Diseased rats were treated with Pc-EA (30, 100, and 300 mg/kg) for 42 days. Cognitive and affective functions were evaluated with behavioral tests on days 29-42. Biochemical assays measured oxidative stress and cholinesterase activity, while RT-PCR quantified neuroinflammatory markers. Histopathological examination was performed to evaluate the integrity of hippocampal regions. Bioactive compounds were identified by phytochemical profiling (HPLC, GC-MS), and molecular docking was performed to assess binding interactions with acetylcholinesterase. AlCl Pc-EA demonstrated multi-targeted neuroprotection in AlCl Show less