title: Nanoconjugation modulates the trafficking and mechanism of antibody induced receptor endocytosis.
abstract: Treatment with monoclonal antibody (mAbs) is a viable therapeutic option in cancer. Recently, these mAbs such as cetuximab, herceptin, etc., have been used as targeting agents to selectively deliver chemotherapeutics to cancerous cells. However, mechanisms of nanoparticles-mAbs interactions with the target cells and its effect on intracellular trafficking and mechanism are currently unknown. In this paper, we demonstrate that the distinct patterning and dynamics of anti-EGFR (epidermal growth factor receptor) antibody cetuximab (C225)- induced EGFR internalization in pancreatic cancer cells with variable receptor expression is altered upon nanoconjugation. Nanoconjugation uniformly enhanced C225-induced EGFR endocytosis in PANC-1, AsPC-1, and MiaPaca-2 cells, influenced its compartmentalization and regulated the involvement of dynamin-2 in the endocytic processes. Receptor endocytosis and its intracellular trafficking were monitored by confocal microscopy and transmission electron microscopy. The role of dynamin-2 in EGFR endocytosis was determined after overexpressing either wild-type dynamin-2 or mutant dynamin-2 in pancreatic cancer cells followed by tracking the receptor-antibody complex internalization by confocal microscopy. Significantly, these findings demonstrate that the nanoconjugation cannot be construed as an innocuous reaction involved in attaching the targeting agent to the nanoparticle, instead it may distinctly alter the cellular processes at the molecular level, at least antibody induced receptor endocytosis. This information is critical for successful design of a nanoparticle-based targeted drug delivery system for future clinical translation.
authors.affiliation: Department of Biochemistry and Molecular Biology, Cancer Center Mayo Clinic, Rochester, MN 55905, USA.
authors.forename: Sanjib
authors.initials: S
authors.lastname: Bhattacharyya
authors.forename: Resham
authors.initials: R
authors.lastname: Bhattacharya
authors.forename: Steven
authors.initials: S
authors.lastname: Curley
authors.forename: Mark A
authors.initials: MA
authors.lastname: McNiven
authors.forename: Priyabrata
authors.initials: P
authors.lastname: Mukherjee
mesh_terms: D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000494:pharmacology*; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology; D001692:Biological Transport / Q000187:drug effects; D002232:Carbocyanines / Q000737:chemistry; D045744:Cell Line, Tumor; D000068818:Cetuximab; D034285:Dynamin II / Q000235:genetics / Q000378:metabolism; D004705:Endocytosis / Q000187:drug effects*; D011992:Endosomes / Q000378:metabolism; D066246:ErbB Receptors / Q000276:immunology / Q000378:metabolism*; D006046:Gold / Q000737:chemistry; D006056:Golgi Apparatus / Q000378:metabolism; D006801:Humans; D008247:Lysosomes / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry*; D018613:Microscopy, Confocal; D046529:Microscopy, Electron, Transmission; D008954:Models, Biological; D009154:Mutation; D010190:Pancreatic Neoplasms / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents; D002232:Carbocyanines; C089187:cyanine dye 3; D006046:Gold; D066246:ErbB Receptors; D034285:Dynamin II; D000068818:Cetuximab