Rong Zhou

Sinomenine, a bioactive alkaloid from Sinomenium acutum, exhibits anti-inflammatory and neuroprotective effects, but its role in neuronal differentiation and morphological maturation remains unclear. This study used Neuro-2a cells and primary neural stem/progenitor cells (NSPCs) to examine the pro-differentiation effects of sinomenine. Sinomenine increased Neuro-2a cell viability at concentrations of 0.1–20 μM and showed no detectable cytotoxicity up to 100 μM. Under differentiation conditions, sinomenine enhanced neuronal differentia-tion and neurite outgrowth in Neuro-2a cells dose-dependently (5–50 μM), increased the proportion of β-tubulin III–positive neurons, promoted multi-neurite formation, and enhanced dendritic comple-xity in NSPCs. Mechanistically, sinomenine selectively induced Akt phosphorylation without activating ERK, p38, or JNK pathways, and pharmacological inhibition of Akt abolished sinomenine-induced neuritogenesis. These findings suggest sinomenine promotes neuronal differentiation and neurite outgrowth via the Akt pathway, supporting its potential in neuroregeneration.

Galanthamine, an alkaloid from the Amaryllidaceae family, serves as an inhibitor of acetylcholinesterase. Beause of its central cholinergic properties, galanthamine is currently being researched as a potential therapeutic agent for the treatment of Alzheimer's disease. Nevertheless, the full extent of its other biological activities is still unclear. Here, we investigated the therapeutic potential of galanthamine in inducing neuronal differentiation and enhancing neurite outgrowth in neural stem and progenitor cells (NSPCs). Our comprehensive analysis revealed significant alterations in neuronal morphology and complexity during neuronal maturation following galanthamine treatment. Specifically, galanthamine significantly increased the percentage of multiple-neurite neurons, suggesting its ability to stimulate neurite formation and promote the development of extensive neuronal networks. Additionally, treatment with galanthamine resulted in a considerable increase in the proportion of mature-appearing neurons, characterized by elongated and intricate dendrites, suggesting its potential in enhancing neural plasticity and repair. Importantly, we further confirmed that galanthamine promotes neuronal differentiation in NSPCs through up-regulation of the IGF2 signaling pathway. Altogether, these findings contribute significantly to our understanding of the effects of galanthamine on Alzheimer's disease and underscore its potential as a therapeutic agent for this neurodegenerative condition.

Galanthamine, an alkaloid derived from the Amaryllidaceae family, serves as an acetylcholinesterase inhibitor. Due to its central cholinergic properties, this compound is being actively studied as a potential treatment for Alzheimer’s disease. However, the broader scope of its biological effects remains poorly understood. In this study, we explored the therapeutic potential of galanthamine in promoting neuronal differentiation and enhancing neurite outgrowth in neural stem and progenitor cells (NSPCs). Our detailed analysis demonstrated notable changes in neuronal morphology and complexity during maturation following galanthamine exposure. Notably, the compound significantly increased the proportion of neurons with multiple neurites, indicating its ability to stimulate neurite formation and foster the development of complex neuronal networks. Furthermore, galanthamine treatment led to a marked rise in the number of mature-appearing neurons, distinguished by elongated and intricate dendrites, highlighting its potential to enhance neural plasticity and repair mechanisms. Importantly, we also identified that galanthamine facilitates neuronal differentiation in NSPCs by up-regulating the insulin-like growth factor 2 signaling pathway. Collectively, these findings provide valuable insights into galanthamine’s role in Alzheimer’s disease and emphasize its promise as a therapeutic agent for this neurodegenerative disorder.

Adult neurogenesis involves the generation of functional neurons from neural progenitor cells, which have the potential to complement and restore damaged neurons and neural circuits. Therefore, the development of drugs that stimulate neurogenesis represents a promising strategy in stem cell therapy and neural regeneration, greatly facilitating the reconstruction of neural circuits in cases of neurodegeneration and brain injury. Our study reveals that compound A5, previously designed and synthesized by our team, exhibits remarkable neuritogenic activities, effectively inducing neurogenesis in neural stem/progenitor cells (NSPCs). Subsequently, transcriptome analysis using high-throughput Illumina RNA-seq technology was performed to further elucidate the underlying molecular mechanisms by which Compound A5 promotes neurogenesis. Notably, comparative transcriptome analysis showed that the up-regulated genes were mainly associated with neurogenesis, and the down-regulated genes were mainly concerned with cell cycle progression. Furthermore, we confirmed that Compound A5 significantly affected the expression of transcription factors related to neurogenesis and cell cycle regulatory proteins. Collectively, these findings identify a new compound with neurogenic activity and may provide insights into drug discovery for neural repair and regeneration.

Adult neurogenesis involves generation of functional neurons from neural progenitor cells, which have the potential to complement and restore damaged neurons and neural circuits. Therefore, the development of drugs that stimulate neurogenesis represents a promising strategy in stem cell therapy and neural regeneration, greatly facilitating the reconstruction of neural circuits in cases of neurodegeneration and brain injury. Our study reveals that compound A5, previously designed and synthesized by our team, exhibits remarkable neuritogenic activities, effectively inducing neurogenesis in neural stem/progenitor cells (NSPCs). Subsequently, transcriptome analysis using high-throughput Illumina RNA-seq technology was performed to further elucidate the underlying molecular mechanisms by which compound A5 promotes neurogenesis. Notably, comparative transcriptome analysis showed that the up-regulated genes were mainly associated with neurogenesis and the down-regulated genes were mainly concerned with cell cycle progression. Furthermore, we confirmed that compound A5 significantly affected the expression of transcription factors related to neurogenesis and cell cycle regulatory proteins. Collectively, these findings identify a new compound with neurogenic activity and may provide insights into drug discovery for neural repair and regeneration.

Neurogenesis in the adult brain comprises the entire set of events of neuronal development. It begins with the division of precursor cells to form a mature, integrated, and functioning neuronal network. Adult neurogenesis is believed to play an important role in animals’ cognitive abilities, including learning and memory. In the present study, significant neuronal differentiation-promoting activity of 80% (v/v) ethanol extract of P. cocos (EEPC) was found in Neuro-2a cells and mouse cortical neural stem/progenitor cells (NSPCs). Subsequently, a total of 97 compounds in EEPC were identified by UHPLC-Q-Exactive-MS/MS. Among them, four major compounds—Adenosine; Choline; Ethyl palmitoleate; and L-(-)-arabinitol—were further studied for their neuronal differentiation-promoting activity. Of which, choline has the most significant neuronal differentiation-promoting activity, indicating that choline, as the main bioactive compound in P. cocos, may have a positive effect on learning and memory functions. Compared with similar research literature, this is the first time that the neuronal differentiation-promoting effects of P. cocos extract have been studied.

Neurogenesis in the adult brain plays a major role in the cognitive ability of animals including learning and memory. Poria cocos (Schw.) Wolf (P. cocos) has been known as a traditional Chinese edible medicinal herb with the potential effect to improve learning and memory. However, the effect mechanisms are still elusive. In this study, significant neuronal differentiation-promoting activities of the ethanol extracts of P. cocos (EEPC) were tested in Neuro-2a cells and mouse cortical neural stem/progenitor cells (NSPCs). Subsequently, 97 compounds of EEPC were identified using UHPLC-Q-Exactive-MS/MS. After investigation of neuronal differentiation-promoting activities of 4 major compounds (Ethyl palmitoleate, L-(-)-Arabitol, Choline and Adenosine), only Choline has significant neuronal differentiation-promoting activity. In summary, we investigated the neuronal differentiation-promoting activity and chemical compositions of EEPC, the study of the neuronal differentiation-promoting effect of ether extract of P. cocos indicated P. cocos’s positive effect on learning and memory functions. This is the first investigation of the neuronal differentiation-promoting effect of ether extract of P. cocos based on similar research references.