Immunoprecipitation is a technique in which an antigen is isolated by binding to a specific antibody attached to a sedimentable matrix. It is also used to analyze protein fractions separated by other techniques such as gel filtration or density gradient sedimentation. The source of antigen for immunoprecipitation can be unlabeled cells or tissues, metabolically or intrinsically labeled cells, or in vitro-translated proteins. This unit describes a wide range of immunoprecipitation techniques, using either suspension or adherent cells lysed by various means.Usually, plasmas transfected cells or natural cells are ideal sample for immunoprecipitation.
Jurkat cells are an immortalized cell line of T lymphocyte cells that are used to study acute T cell leukemia, T cell signaling, and the expression of various chemokine receptors susceptible to viral entry, particularly HIV. Jurkat cells are also useful in science because of their ability to secret interleukin 2. Their primary use, however, is to determine the mechanism of differential susceptibility of cancers to drugs and radiation. The Jurkat cell line (originally called JM) was established in the late 1970s from the peripheral blood of a 14 year old boy with T cell leukemia. Different derivatives of the Jurkat cell line can now be obtained from cell culture banks that have been mutated to lack certain genes.
Jurkat J6 cells have been found to produce a xenotropic murine leukemia virus (X-MLV) that could potentially affect experimental outcomes and infect lab technicians. The infection may also change the virulence and tropism of the virus by way of phenotypic mixing and/or recombination.