In 1982, McBurney et al. from the University of Ottawa in Canada isolated the P19 cell line from the teratocarcinoma of male mice. It is a type of pluripotent stem cell capable of being cultured in vitro. When treated with retinoic acid (RA), P19 cell aggregates can differentiate into neurons, glial cells, and fibroblasts; whereas treatment with dimethyl sulfoxide (DMSO) induces their differentiation into cardiomyocytes, skeletal muscle cells, and smooth muscle cells. During the process of P19 cell differentiation into neurons, the expression patterns of neurodevelopment-related genes largely mimic those of normal mouse neurodevelopment. Therefore, P19 cells are currently used as an in vitro model for studying neurodevelopment.
As a model for investigating the mechanisms of neural differentiation, P19 cells exhibit four major characteristics that distinguish them significantly from other cell lines:
Diploid Karyotype and Rapid Growth: P19 cells possess a diploid karyotype typical of normal mice, divide rapidly, and can be quickly expanded in large quantities in vitro. They maintain their differentiation potential even after multiple passages.
Pluripotent Differentiation Capacity: P19 cells have broad differentiation potential and can be directionally induced to differentiate into various types of cells under different conditions. When injected into the blastocysts of pregnant mice, they can contribute to the formation of multiple cell types.
Stage-Specific Differentiation: The stepwise nature of P19 cell induction and differentiation allows researchers to separately investigate the early mechanisms of neurogenesis and those involved in neurite outgrowth.
Ease of Transfection and Functional Studies: P19 cells are easily transfected and can still undergo normal differentiation post-transfection, making them suitable for gene function studies. By transfecting normal or mutant target genes to enhance or suppress their expression levels, researchers can study the roles of these genes in neural differentiation. Additionally, using antisense RNA to block the expression of endogenous proteins enables the observation of their roles in this process.