Targeted Delivery Of Carbon Nanotubes To Cancer Cells

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Targeted Delivery Of Carbon Nanotubes To Cancer Cells

Show simple item record Chakravarty, Pavitra en_US 2010-07-19T19:55:08Z 2010-07-19T19:55:08Z 2010-07-19 January 2010 en_US
dc.identifier.other DISS-10698 en_US
dc.description.abstract CD22 is broadly expressed on human B cell lymphomas. Monoclonal anti-CD22 antibodies (MAbs) alone, or coupled to toxins, have been used to selectively target these tumors both in severe combined immunodeficient (SCID) mice with xenografted human lymphomas and in patients. Single-walled carbon nanotubes (CNTs) attached to antibodies or peptides represent another approach to targeting cancer cells. CNTs convert absorbed near-infrared (NIR) light into heat, which can thermally ablate cells in the vicinity of the CNTs. We have made MAb-CNT constructs where the MAb was either noncovalently or covalently coupled to CNTs, and investigated their ability to bind specifically to cells and to thermally ablate them after exposure to NIR light. The specific binding of these MAb-CNT constructs to antigen-positive and antigen-negative cells was demonstrated in vitro by using CD22+CD25- Daudi cells, CD22-CD25+ phytohemagglutinin (PHA)-activated normal human peripheral blood mononuclear cells (PBMCs) and CNTs coupled non-covalently or covalently to either anti-CD22 or anti-CD25. We then demonstrated that the MAb-CNTs could bind to tumor cells expressing the relevant antigen but not to cells lacking the antigen. Furthermore we showed that, following exposure to NIR light, the cells could be thermally ablated. We also determined the stability of the MAb-CNTs in conditions designed to mimic the in vivo environment, i.e. mouse serum at 37oC.We then use the intrinsic Raman signature of CNTs to study the circulation and tissue distribution of intravenously injected MAb-CNTs in a murine xenograft model of lymphoma in vivo over a period of 24 hrs. We demonstrated that the MAb-CNTs have a short half-life in blood and that most of them are cleared by the reticuloendothelial system (RES). In the current embodiment, these constructs would therefore be of limited effectiveness in vivo en_US
dc.description.sponsorship Vitetta, Dr. Ellen en_US
dc.language.iso EN en_US
dc.publisher Biomedical Engineering en_US
dc.title Targeted Delivery Of Carbon Nanotubes To Cancer Cells en_US
dc.type Ph.D. en_US
dc.contributor.committeeChair Vitetta, Dr. Ellen en_US Biomedical Engineering en_US Biomedical Engineering en_US University of Texas at Arlington en_US doctoral en_US Ph.D. en_US

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