Abstract: Described herein are aptamers that bind to the transferrin receptor (e.g., CD71) and can be used, in part, for depleting transferrin receptor-expressing cells from a population of therapeutic cells. These aptamer compositions can be used in methods for isolating and/or enriching cells expressing CD71 or depleting cell populations of cells expressing CD71, including for example, tumor cells. Further provided are methods of using the aptamers or cell populations generated using them in the methods disclosed herein for therapies and/or drug delivery.

Abstract: Provided herein are compositions comprising aptamers that specifically bind monocytes and/or macrophage and methods for their use. These aptamer compositions can be used in methods for isolating and/or enriching monocytes and/or macrophages or depleting cell populations of monocytes and/or macrophages. Further provided are methods of using the aptamers or cell populations generated using them in the methods disclosed herein for therapies and/or drug delivery.

Abstract: Described herein is a reversible aptamer selection technology for production-scale isolation of label-free cells (e.g., CD8+ T cells). Provided herein are methods for isolating a cell of interest from a biological sample by contacting the biological sample with an aptamer that specifically binds a cell surface marker specific for the cell of interest; separating the aptamer-bound cells from cells not bound to the aptamer; and recovering a cell of interest by disrupting binding of the aptamer to the cell surface marker.

Abstract: Aspects of the invention described herein include methods of treating, inhibiting, ameliorating and/or eliminating a virus or cancer cells in a subject utilizing genetically engineered human T-cells having receptors for a molecule presented by the virus or the cancer cells, wherein the genetically engineered T cells are isolated utilizing a two-stage MTX selection that employs increasing concentrations of MTX.

Abstract: Aspects of the invention described herein include methods of treating, inhibiting, ameliorating and/or eliminating a virus or cancer cells in a subject utilizing genetically engineered human T-cells having receptors for a molecule presented by the virus or the cancer cells, wherein the genetically engineered T cells are isolated utilizing a two-stage MTX selection that employs increasing concentrations of MTX.