Convolvulus pluricaulis

Multiple rodent studies demonstrate improved learning and memory in Morris water maze and passive avoidance paradigms, with reversal of scopolamine-induced amnesia comparable to rivastigmine. One open-label human study (n=30) showed 41-48% improvement in auditory memory and 32-45% improvement in visual memory after 2 months, though it lacked placebo control. Mechanistically linked to acetylcholinesterase inhibition, enhanced long-term potentiation (LTP) in hippocampus, and reduction of tau and amyloid precursor protein expression in rat brain.

In rodent models, Convolvulus pluricaulis extracts protect against cerebral ischemia-reperfusion injury (reducing lipid peroxidation and increasing SOD, catalase, glutathione), attenuate 3-nitropropionic acid-induced neurotoxicity relevant to Huntington's disease, and reduce tau and amyloid precursor protein expression in a scopolamine-induced Alzheimer's model. A Drosophila study confirmed rescue of tau-induced neurotoxicity and lifespan extension in a transgenic Alzheimer's fly model.

Multiple animal studies demonstrate anxiolytic effects comparable to benzodiazepines in elevated plus maze and other behavioral models. Mechanism appears to involve GABA-A receptor modulation. Dose-dependent CNS depressant and anxiolytic effects confirmed across hydroalcoholic, ethanolic, and chloroform extracts in mice at 100-300 mg/kg.

Multiple preclinical studies document increased antioxidant enzyme activity (SOD, catalase, glutathione) and decreased lipid peroxidation in brain tissue following Convolvulus pluricaulis administration. Antioxidant effects are consistently observed across neuroprotection, memory, and ischemia models in rodents.

In mouse forced swim and tail suspension tests, chloroform fraction (50-100 mg/kg) produced antidepressant effects comparable to imipramine and fluoxetine, mediated through adrenergic, dopaminergic, and serotonergic systems. In a chronic unpredictable mild stress rat model, methanolic extract reduced pro-inflammatory cytokines (IL-1β, IL-6, TNF-α) and restored hippocampal serotonin and noradrenaline levels.

In rodent models, ethanolic and aqueous extracts provided significant protection against pentylenetetrazole (PTZ)-induced seizures (p<0.001) and potentiated pentobarbital-induced sleep. Mechanism proposed involves GABAergic enhancement. Traditional Ayurvedic use for epilepsy has some preclinical support.

Traditional Ayurvedic use for hyperthyroidism is supported by limited animal data suggesting reduction of thyroid hormone levels. Mechanism remains unclear and clinical evidence is absent. Caution advised in individuals with thyroid disorders.