Assays for B Lymphocyte Function Protocols- https://catalog.invitrogen.com/index.cfm?fuseaction=iProtocol.unitSectionTree&treeNodeID=9E66340AD6485AA0FEB8F538B2FD389E&objectid=6674A538AC9B642C5CD51556EF7B3D26
Describes the antigenic stimulation of in vitro antibody production by B cells and the subsequent measurement of secreted antibodies. The first protocol is a generalized system for inducing in vitro antibody production and can accommodate various types of antigens under study. Secreted antibodies can then be measured with an enzyme-linked immunosorbent assay (ELISA) or other soluble-antibody detection systems. - [Read Assays for B Lymphocyte Function Protocols]
Mononuclear phagocyte progenitor cells derived from femoral and tibial bone marrow are propagated in the presence of M-CSF. This macrophage growth factor is secreted by L929 cells and is used in the form of L929 cell conditioned medium. The progenitor cells proliferate and differentiate through monoblast, promonocyte and monocyte stages before maturing to macrophages. At this time the cells become firmly adherent to the culture vessel. - [Read Isolation and Culture of Mouse Bone Marrow-Derived Macrophages Protocol]
Bacteriophage M13 single-stranded DNA is prepared from virus particles secreted by infected cells into the surrounding medium. The filamentous particles are concentrated by precipitation from a high-ionic-strength buffer with polyethylene glycol. Subsequent extraction with phenol releases the single-stranded DNA, which is then collected by precipitation with ethanol. This protocol is generally used to prepare single-stranded DNA from a small number of M13 isolates. - [Read Preparation of Single-stranded Bacteriophage M13 DNA Protocol]
Transient transfection into 293T cells is a convenient way to overexpress and obtain both cellular and extracellular (secreted or membrane) proteins. 293 is a human renal epithelial cell line which is transformed by adenovirus E1A gene product. 293T is a derivative which also express SV40 large T antigen, allowing episomal replication of plasmids containing the SV40 origin and early promoter region. They (both) have the unusual property of being highly transfectable. - [Read Transient Transfection Into 293T Cells Protocol]