Objective: The present study aims to evaluate the neuroprotective and neuromodulatory properties of icariin in an MPTP-induced Parkinsonian rat model.

Background: Parkinson Disease (PD) is the second most prevalent neurodegenerative disorder in the world. Moreover, the present epidemiological studies have revealed that PD is the fastest growing neurological disease in the world in terms of prevalence, disability burden, and mortality. The primary cause of PD is motor dysfunction due to the progressive loss of dopaminergic neurons in the nigra. This is due to mitochondrial dysfunction, oxidative stress, and apoptosis. Plant-derived compounds have been of significant interest in the world due to the absence of any effective treatment for PD. Moreover, the major bioactive component of the revered traditional medicinal plant Epimedium sagittatum of Korea, which is conventionally used to treat sexual impairments, osteoporosis, and cardiovascular dysfunction, has gained significant importance in the treatment of PD due to its multifunctional neuroprotective effects.

Method: Experimental animal were randomly divided into three groups Vehicle control; MPTP control and MPTP and icariin treated rats. Oral icariin administration was maintained throughout a 28-day protocol, with weekly monitoring of body weight and locomotor behaviour. post 28 days brain homogenates were subjected to biochemical profiling encompassing mitochondrial complex activity, antioxidant defense markers (SOD, catalase, glutathione), expression of apoptosis-regulatory proteins (caspase-3, Bax, Bcl-2), and neuroinflammatory cytokine levels (IL-6, TNF-α).

Results: MPTP control rats showed impaired locomotor behaviour, accompanied by oxidative stress, apoptosis and decreased mitochondrial complex activity. In contrast, icariin treated rats exhibited significant amelioration of motor coordination, restoration of antioxidant enzymes and enhanced mitochondrial complex functioning. Icariin treatment further modulated apoptotic signalling by suppressing proapoptotic protein expression and upregulating the antiapoptotic proteins (bcl-2) level and alleviating neuroinflammation through suppression of IL-6 and TNF-α.

Conclusion: Icariin effectively mitigated MPTP-induced neurodegeneration through coordinated modulation of oxidative, mitochondrial, apoptotic, and inflammatory pathways.

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MDS Abstracts - https://www.mdsabstracts.org/abstract/icariin-a-flavonoid-from-epimedium-confers-dopaminergic-neuroprotection-and-neuromodulation-in-mptp-induced-parkinsonian-rats/