Description:
STAT1 Responsive Luciferase Reporter Hela Stable Cell Line is derived from human cervical cancer, and stably express firefly luciferase reporter gene under the control of the STAT1 response element. This cell line is an ideal cellular model for monitoring the activation of JAK-STAT Receptor Signaling Pathway triggered by stimuli treatment, enforced gene expression and gene knockdown.Principle:
STAT1 exerts a complex array of functions on both tumor cells and the immune system and is usually considered as a tumor suppressor. STAT1 is a central mediator of type II (gamma) IFNs, a family of multifunctional secreted proteins involved in cell growth regulation and antiviral and immune defense. IFN-gamma (IFNγ), through JAK1 and JAK2, mainly triggers prolonged STAT1 activation that induces gene expression by binding to gamma-activated sequences (GAS). This cell line can be used to monitor the activation of Stat1 in response to the different stimuli, such as IFNgamma.
The cell line was established by transfectionusing apTA-Stat1-luciferase reporter vector, which contains 4 repeats of Stat1 binding sites, a minimal promoter upstream of the firefly luciferase coding region,along with hygromycin expression vector followed by hygromycin selection.The hygromycin resistant clones were subsequently screened for oncostatin induced luciferase activity. The clone with the highest fold induction (50 fold) was selected and expanded to produce this stable cell line.
Data:
Analysis of HeLa/STAT1-luciferase activity.The cells were seeded on a 96-well plate for overnight and then cells were treated with or without 30ng/ml interferon-gamma in DMEM and 0.1% FBS for 16 hours. Interferon-gamma induces more than 25 fold increase in luciferase activity when compared to untreated cells.
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