Parkinson’s disease (PD) is a progressive neurodegenerative condition with a multifactorial etiology, characterized by dopaminergic neurons being selectively absent in the midbrain. Clinically, PD manifests primarily with core motor symptoms of resting tremor, bradykinesia, and muscle rigidity, and is often accompanied by non-motor symptoms including depression, cognitive impairment, and gastrointestinal dysfunction. Among the extensive relevant research, few have explored the precise pathogenic mechanisms underlying PD, and no curative treatment is available. Current pharmacological therapies mainly provide symptomatic relief by enhancing central dopaminergic function or modulating cholinergic activity; however, their long-term efficacy is frequently constrained by waning therapeutic response, drug tolerance, and adverse reactions. Accumulating evidence suggests that several naturally derived neuroactive compounds—such as gastrodin, uncarin, and paeoniflorin—demonstrate significant potential in combating PD. In this systematic review, we examined original research articles published from 2010 to 2025, retrieved from PubMed, Web of Science, and CNKI databases, using predefined keywords of Parkinson’s disease, neuroprotective herbal compounds, traditional medicine, multi-target mechanisms, natural product, autophagy, neuroinflammation, and oxidative stress. Studies were included if they specifically investigated the mechanistic actions of natural compounds in PD models. Conference abstracts, review articles, publications not in English or Chinese, and studies lacking clearly defined mechanisms were excluded. Analysis of the available literature reveals that natural neuroactive compounds may exert anti-PD effects through multiple mechanisms, e.g., inhibiting pathological α-synuclein aggregation, attenuating neuronal apoptosis, suppressing neuroinflammation, mitigating oxidative stress, and restoring mitochondrial dysfunction. This review provides insights that may inform the clinical application of natural bioactive compounds and guide their further development as potential therapeutic candidates against PD.

In the context of the global diabetes epidemic, diabetic nephropathy (DN)—a condition directly associated with diabetes—has become the primary cause of end-stage renal disease, significantly impacting patients’ quality of life and placing substantial demands on public healthcare resources. The pathogenesis of DN is characterized by metabolic disturbances induced by high glucose levels, hemodynamic abnormalities, and the synergistic amplification of various stress signals. These factors collectively contribute to the progressive loss of nephrons and irreversible renal dysfunction. Although current standard treatments can partially slow disease progression, they significantly fail to meet clinical needs. Therefore, there is an urgent necessity to identify multi-target intervention strategies that utilize novel mechanisms of action. Alkaloids, a class of natural nitrogen-containing compounds known for their significant structural diversity, have recently demonstrated multiple renoprotective effects in experimental models of DN. This review is based on a search of the PubMed, Web of Science and CNKI databases. The keywords alkaloids, diabetic nephropathy, diabetic nephropathies, diabetic kidney disease, inflammation, oxidative stress, fibrosis, autophagy and apoptosis were used to search for original research articles in both Chinese and English, published between 2010 and 2026, which investigated the mechanisms by which alkaloid compounds exert their anti-DN effects. Focusing on anti-inflammatory effects, anti-oxidative stress, anti-renal fibrosis, autophagy modulation, apoptosis regulation and ferroptosis inhibition, the review then summarized the relevant literature by systematizing the experimental models, intervention protocols, dosages and key results. This provided a new theoretical perspective and experimental basis for the clinical translation and new drug development of alkaloid compounds for the treatment of DN. The review provides a new theoretical perspective and an experimental basis for the clinical translation of, and new drug development based on, alkaloid compounds for the treatment of DN.