“…PLGA, as a synthetic polymer, is one of the most widely used drug delivery carrier (Zeng et al, 2013 ; Cheng et al, 2018 ; Shi et al, 2020 ), which can transport proteins (Xu et al, 2020 ; Zhai et al, 2020 ), peptides (Cai et al, 2019 ; Zhang et al, 2020 ; Jin et al, 2021 ), bacterial or viral DNA (Koerner et al, 2019 ; Lu et al, 2020 ), and various anticancer drugs (Lee et al, 2018 ; Shakeri et al, 2020 ). PLGA is synthesized by random polymerization of lactic acid (LA) and glycolic acid (GA), which has good biocompatibility and biodegradability (Peng et al, 2018 ; Ma et al, 2020 ). PLGA is hydrolyzed into lactic acid and glycolic acid in vivo, and further metabolized into water and carbon dioxide through the tricarboxylic acid cycle, and finally excreted in the lung.…”