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Biodegradable poly(d,l-lactic-co-glycolic acid) (PLGA) was chemically conjugated to oligonucleotide (ODN) to form an amphiphatic structure which is similar to an A−B type block copolymer. A terminal end of PLGA was activated and reacted with primary amine-terminated ODN. The ODN/PLGA conjugates self-assembled in aqueous solution to form a micellar structure by serving PLGA segments as a hydrophobic core and ODN segments as a surrounding hydrophilic corona. Critical micelle concentration was determined by a spectroflurometric method. Atomic force microscopic observation revealed that the micelle size was around 80 nm. These micelles could release ODN in a sustained manner by controlled degradation of hydrophobic PLGA chains. Compared to unconjugated ODN, the ODN/PLGA micelles could be more efficiently transported within cells, presumably by endocytosis. This study proposes a …