Adipose-derived mesenchymal stem cells(Saier)

Primary Objective: To evaluate the safety and tolerability of adipose-derived mesenchymal stem cell injection in patients with type 2 diabetes mellitus, and to recommend appropriate treatment doses, dosing frequencies, and intervals for subsequent clinical trials. Secondary Objective: To evaluate the preliminary efficacy of adipose-derived mesenchymal stem cell injection in patients with type 2 diabetes mellitus. Exploratory Objectives: (1) To explore the immunogenicity of adipose-derived mesenchymal stem cell injection in patients with type 2 diabetes mellitus; (2) To explore the pharmacokinetic characteristics of adipose-derived mesenchymal stem cell injection in patients with type 2 diabetes mellitus; (3) To explore the pharmacodynamic characteristics of adipose-derived mesenchymal stem cell injection in patients with type 2 diabetes mellitus; (4) To explore the effects of adipose-derived mesenchymal stem cell injection on body weight and triglycerides in patients with type 2 diabetes mellitus.