Transduced mouse
immature thymocytes can be differentiated into T cells in vitro using
the delta-like-4-expressing bone marrow
stromal cell line co-culture system (OP9-DL4). As retroviral transduction requires dividing cells for transgene
integration, OP9-DL4 provides a suitable in vitro environment for
cultivating hematopoietic progenitor cells. This is particularly advantageous
when studying the effects of expression of a specific gene during normal T-cell
development and leukemogenesis, as it allows researchers to circumvent the time-consuming
process of generating transgenic mice. To achieve successful outcomes, a
series of coordinated steps involving the simultaneous manipulation of
different types of cells must be carefully performed. Although these are very well-established procedures,
the lack of a common source in the literature often demands a series of
optimizations, which can be time-consuming. This protocol has been shown to be
efficient in transducing primary thymocytes followed by differentiation on
OP9-DL4 cells. Detailed here are the steps that can serve as a quick and
optimized guide for the co-culture of retrovirally transduced thymocytes on
OP9-DL4 stromal cells.