The Safety, Tolerability and Preliminary Efficacy of NouvNeu001 for Early-onset Parkinson's Disease

Inclusion Criteria: * Age 18-70 years old, male or female * Able to understand the rationale of the clinical trial and sign informed consent form (ICF) * Diagnosis of Early-onset Parkinson's Disease in accordance with the MDS clinical diagnostic criteria for Parkinson's disease, and the age of onset was ≤50 years old * Medically suitable for neurosurgery under anesthesia and able to participate in Computed Tomography (CT)/Magnetic Resonance Imaging (MRI) scan. * Hoehn-Yahr staging for "off" episodes is 2 to 4 * The MDS-UPDRS-III score in the "off" state \>30, and positive for the Acute Levodopa Challenge Test (ALCT) * Acceptable laboratory test results during screening and prior to transplantation Exclusion Criteria: * Atypical Parkinsonism * Patients who have had previous pallidotomy, striatal or extrapyramidal surgery or other brain surgery; as well as other surgical procedures that are judged by the investigator to affect patient's participation in this study; Patients with surgical contraindications or other neurosurgical contraindications * Patients who have a previous head CT/MRI examination showing cerebral trauma, vascular malformation, hydrocephalus, brain tumor, etc., and patients who have brain imaging abnormalities in the striatum or other brain areas leading to a significantly increased risk for surgery * Patients with a history of severe cardiovascular and cerebrovascular diseases * Patients with a history of malignant tumors * Patients who have received stem cell therapy for Parkinson's disease within 2 years before signing the ICF * Patients with active disseminated intravascular coagulation and significant hemorrhagic tendency within 3 months prior to screening, or who cannot temporarily suspend anti-platelet agents or other anti-coagulant medications for at least 5 days before surgery * Patients with long-term, heavy use of glucocorticoids or immunosuppressive drugs within 3 months prior to signing the ICF * Patients with a history of mental illness who are deemed unfit to participate in the study by the investigator; or a history of suicidal ideation or suicide attempts within the past year or currently * Patients who have used botulinum toxin within 6 months prior to signing the ICF * Patients with active epilepsy or currently on anti-epileptic drugs * Patients with a history of dementia or severe cognitive disorder, or the score of MDS-UPDRS 1.1 during screening is \> 3; poor compliance, inability to accurately keep diary, and/or inability to sign ICF due to dementia * Patients with severe depression or with severe anxiety * Patients with the following abnormalities during screening, including: Abnormal coagulation; Abnormal immunological tests, and assessed by the investigator it is not suitable to participate in the trial; Hypertensive patients with poorly controlled blood pressure and patients with severe postural hypotension; Diabetic patients with poorly controlled blood glucose * Patients with other combined severe systemic diseases, such as pulmonary heart disease, moderate to severe asthma, severe chronic obstructive pulmonary disease (COPD) * Presence of one of the following: positive for human immunodeficiency virus (HIV) antibody, treponema pallidum antibody, hepatitis C virus (HCV) antibody and HCV RNA; Hepatitis B virus (HBV) surface antigen positive and HBV DNA copy number \> detection of normal values; Tuberculosis is in the active stage; Other active infections that the investigator believes may affect Patients' participation in the study or affect study outcomes * Patients with alcohol addiction or positive for drug of abuse testing * Patients with a history of contraindication or allergy to the drugs used during the study or any of its components, or are allergic to the same drugs or other macrolides, or have allergies * Female of childbearing potential who are not surgically sterilized/premenopausal/unwilling to use medically approved effective contraception with 2 years after administration of investigational drug and lactating women; men who are not surgically sterilized/unwilling to use medically approved effective contraception with 2 years after administration of investigational drug * Patients who have received electric shock therapy within 30 days prior to surgery * Patients who are participating in other clinical trials, or have been enrolled in other clinical studies and received intervention therapy within 3 months prior to the surgery * Patients with poor compliance based on clinical evaluation of the investigator * Patients who are being treated with drugs such as apomorphine, or levodopa/carbidopa infusion therapy * Patients with severe dyskinesia in both on- and off-drug states