title: FRET imaging reveals different cellular entry routes of self-assembled and disulfide bonded polymeric micelles.
abstract: Although nanocarriers hold promise for cancer chemotherapy, their intracellular drug delivery pathways are not fully understood. In particular, the influence of nanocarrier stability on cellular uptake is still uncertain. By physically loading hydrophobic FRET probes, we revealed different intracellular drug delivery routes of self-assembled and disulfide bonded micelles. The self-assembled micelles were structurally dissociated by micelle-membrane interactions, and the hydrophobic probes were distributed on the plasma membrane. Alternatively, intact disulfide bonded micelles carrying hydrophobic probes were internalized into cancer cells via multiple endocytic pathways. Following internalization, disulfide bonded micelles were decomposed in early endosomes by glutathione-mediated disulfide bond reduction, exposing the probes to intracellular organelles.
authors.affiliation: Weldon School of Biomedical Engineering, ‡Department of Industrial and Physical Pharmacy, and §Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.
authors.forename: Seung-Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Jacqueline Y
authors.initials: JY
authors.lastname: Tyler
authors.forename: Sungwon
authors.initials: S
authors.lastname: Kim
authors.forename: Kinam
authors.initials: K
authors.lastname: Park
authors.forename: Ji-Xin
authors.initials: JX
authors.lastname: Cheng
mesh_terms: D002460:Cell Line; D004220:Disulfides / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D005978:Glutathione / Q000378:metabolism; D006801:Humans; D061986:MCF-7 Cells; D008823:Micelles; D050997:Nanomedicine; D011108:Polymers / Q000737:chemistry*
chemical_list: D004220:Disulfides; D008823:Micelles; D011108:Polymers; D005978:Glutathione
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