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Paclitaxel was obtained from National Institute for Food and Drug Control. Soybean phospholipids (SPC) was purchased from Kelong Chemical (Chengdu, China). Cholesterol (Chol) was purchased from Bio Life Science & Technology Co., Ltd (Shanghai, China). D-(+)-Biotin was purchased from shanghai darui fine chemical Co., Ltd (Shanghai, China). GOx was obtained from Sigma-Aldrich (St. Louis, MO, USA). 1,2-dioleoyl-snglycero-3-phosphoethanolamine-N-(carboxyfluorescein) (CFPE) was purchased from Avanti Polar Lipids (USA). 4'-6-Diamidino-2-phenylindole (DAPI) and 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) were purchased from Beyotime Institute Biotechnology (Haimen, China). 4-chlorobenzenesulfonate salt (DiD) was purchased from Biotium (USA). Annexin V-FITC/PI apoptosis detection kit was obtained from BD Pharmingen^TM (USA). Enhanced BCA Protein Assay Kit (Beyotime^®, China). Hydrogen Peroxide (H₂O₂) Assay Kit (Beyotime®, China). Reactive Oxygen Species (ROS) Assay Kit (Beyotime®, China). Calcein-AM/PI Live/Dead Cell Double Dyed Kit (Solarbio®, China). JC-1 dye (Beyotime®, China).

OVA was purchased from Sigma-Aldrich (St Louis, MO, USA). Polyethyleneimine (PEI, molecular weight 1800 Da) and oleic acid (OA) were obtained from Shanghai Aladdin Biochemical Technology Co., Ltd (Shanghai, China). PTX and CQ were purchased from Dalian Meilun Biotech Co., Ltd. (Dalian, China). 4-Chlorobenzenesulfonate salt (DiD) was provided by Biotium (Hayward, CA, USA). Fluorescein (FITC)-conjugated rat anti-mouse CD4 antibody, PE-conjugated rat anti-mouse CD8a antibody, and the Annexin V-FITC/PI apoptosis detection kit were purchased from BioLegend, Inc. (San Diego, CA, USA). Anti-GAPDH was obtained from CWBIO (Beijing, China), and monoclonal anti-LC3B antibodies were purchased from Sigma-Aldrich. Anti-p62 (SQSTM1) antibodies were from Proteintech Group (Rosemont, IL, USA), and horseradish peroxidase (HRP)-conjugated-goat anti-rabbit IgG (H + L) secondary antibody was from Invitrogen (catalog no. 31460, Carlsbad, CA, USA). FITC-conjugated ImmunoPure goat anti-rabbit IgG (H + L) antibodies were purchased from Feiyi Technology (Wuhan, China), while anti-PD-L1 antibody (atezolizumab) was from Selleck Chemicals (Houston, TX, USA). Mouse mammary breast tumor cells (4T1) and Hela cells were obtained from the Chinese Academy of Science Cell Bank (Shanghai, China).