Phase 1 Clinical Study of MWN117 Injection in Healthy Participants and Participants With Obesity

Inclusion Criteria: 1. Aged 18 to 55 years (inclusive) at the time of informed consent signing; male or female. 2. Body mass index (BMI): Part A, healthy participants, 20.0-27.9 kg/m² (inclusive); Part B, obese participants, 28.0-35.0 kg/m² (inclusive), with body weight \> 60 kg for males and \> 50 kg for females. 3. Stable weight for 3 months prior to screening (self-reported weight change ≤ 5%), with no major changes in diet or physical activity, and the ability to maintain a stable lifestyle during the study. 4. Participants and their sexual partners must have no plans for pregnancy or sperm/oocyte donation from the time of ICF signing until at least 12 months post-dose; participants must use effective non-pharmacological contraception during this period. Female participants of childbearing potential must have a negative serum pregnancy test at screening. Exclusion Criteria: 1. Use of GLP-1 receptor agonists (e.g., liraglutide, semaglutide, tirzepatide) within 3 months prior to screening. 2. Use of medications significantly affecting body weight within 3 months prior to screening, including but not limited to: orlistat, lorcaserin, phentermine/topiramate, naltrexone/bupropion, weight-affecting herbal products, or meal replacements; cumulative or continuous use of systemic steroids ≥ 14 days (IV/oral), tricyclic antidepressants, psychiatric medications, or sedatives (e.g., imipramine, amitriptyline, mirtazapine, paroxetine, phenelzine, chlorpromazine, thioridazine, clozapine, olanzapine, valproic acid, lithium). 3. Endocrine disorders that may significantly affect body weight (e.g., Cushing's syndrome, hypothyroidism, or hyperthyroidism), or drug-induced, monogenic, or genetic obesity syndromes. 4. History of surgery or device treatment for overweight or obesity. 5. Diagnosis of type 1 or type 2 diabetes, or laboratory findings suggesting diabetes during screening (HbA1c ≥ 6.5%, fasting serum glucose ≥ 7.0 mmol/L, or random glucose ≥ 11.1 mmol/L). 6. Clinically significant laboratory abnormalities at screening: a) ALT, AST, GGT, or TBIL \> 1.5 × ULN; b) Serum Cr \> 1.2 × ULN or eGFR \< 80 mL/min/1.73 m²; c) Fasting TG \> 5.65 mmol/L (500 mg/dL). 7. 12-lead ECG abnormalities at screening: a) PR interval ≥ 210 ms; b) QRS duration ≥ 120 ms; c) QTcF \> 450 ms (males) or \> 470 ms (females); d) Any other clinically significant ECG abnormality as judged by the investigator. 8. Use of liver-targeted antisense oligonucleotides (ASO) or small interfering RNA (siRNA) drugs within 12 months prior to screening. 9. History of hypersensitivity to any component of MWN117, other siRNA drugs, or GalNAc-conjugated drugs; or allergy to two or more drugs or foods; or history of severe allergic reactions.