HEK STING Reporter Cells
STING SEAP Reporter 293
293-Dual™ STING (ISG/KI-IFNb) cells are a family of reporter cells designed to study variants of STING (stimulator of interferon genes; also known as TMEM173, MITA, MPYS, and ERIS).
STING is essential for the interferon (IFN) response to cytoplasmic foreign or self-DNA and directly senses cyclic dinucleotides (CDNs), which are important messengers in bacteria and innate immune agonists in mammals.
Interestingly, a variety of natural non-synonymous variants of human STING that affect CDN recognition and signal transduction have been identified .
293-Dual™ STING (ISG/KI-IFNb) cells enable the study of STING variation by monitoring the activation of the transcription factor ISRE (IFN-stimulated response elements) and/or the expression of IFN‑β.
293-Dual™ STING (ISG/KI-IFNb) cells were generated from 293-Dual™ Null (ISG/KI-IFNb) cells, which derive from 293 cells, human embryonic kidney 293-derived cells.
293-Dual™ Null (ISG/KI-IFNb) cells do not respond to stimulation by CDNs.
293-Dual™ STING and their parental cell line stably express an ISRE-inducible SEAP (secreted embryonic alkaline phosphatase) reporter construct.
They also express Lucia luciferase, a secreted luciferase, placed under the control of the endogenous IFN-β promoter; the coding sequence of IFN-β has been replaced by the Lucia luciferase ORF using knockin technology.
Thus, CDN stimulation can be assessed in 293-Dual™ STING (ISG/KI-IFNb) cells by monitoring ISRE-induced SEAP production and/or IFN-β-dependent expression of Lucia luciferase.
The two reporter proteins, SEAP and Lucia Luciferase, can be readily measured in the supernatant by using QUANTI-Blue™ and QUANTI-Luc™, respectively.