EF1a-SV40/LTA(Zeo) Lentiviral Particles

EF1a-SV40/LTA(Zeo) Lentiviral Particles are high-titer, replication-incompetent viral vectors designed for the stable integration and expression of the Simian Virus 40 (SV40) Large T Antigen in mammalian cells. The expression is driven by the human Elongation Factor-1 alpha (EF1a) promoter, which provides high-level, constitutive transcriptional activity across a wide variety of cell types, including primary cells, stem cells, and hematopoietic lineages where other promoters might be prone to epigenetic silencing. The inclusion of the SV40 Large T Antigen (LTA) allows for the modulation of host cell cycle regulatory pathways, specifically through the inhibition of p53 and retinoblastoma (Rb) proteins. The vector also incorporates a Zeocin resistance gene as a selectable marker, enabling the rapid and precise generation of stable cell populations following transduction. These particles are typically concentrated and purified to ensure high efficiency and low cellular toxicity during the infection process.

These lentiviral particles are most commonly used for the immortalization of primary cells to establish continuous cell lines. By overriding natural senescence pathways, researchers can create stable models for long-term studies that would otherwise be impossible with finite primary cultures. This capability is essential in fields such as drug discovery, toxicology, and basic cell biology where a consistent cell supply is required. The SV40 Large T Antigen is also frequently utilized to enhance the expression of proteins in transient transfection systems. In cells expressing LTA, plasmids containing an SV40 origin of replication can undergo episomal amplification, leading to significantly higher yields of recombinant proteins or viral progeny. These particles also find utility in oncology research for studying transformation mechanisms, as well as in the development of specialized packaging cell lines for viral vector production. By providing a reliable method for stable LTA expression, these lentiviral particles facilitate the creation of robust experimental platforms for diverse molecular and cellular research needs.