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In mice, exposure to cockroach allergen (CRA) provides a model for allergic airway inflammation. In this experiment, the expression of cytokine interleukin 4 (IL-4) was measured in lung samples from mice treated with CRA. Quantitative PCR (qPCR) was performed using the TB Green Premix Ex Taq II (Tli RNaseH Plus) kit with an Applied Biosystems 7500 Real-Time PCR System. The TB Green Premix Ex Taq II kit provided accurate gene expression measurement, allowing the quantification of relative IL-4 induction levels in response to CRA.
The TB Green Premix Ex Taq II enzyme efficiently and specifically amplified mouse IL-4 and the GAPDH control. Relative expression of IL-4 was higher in CRA-treated lung samples than in PBS-treated samples.
Upregulation of the cytokine IL-4 is associated with allergies. It was expected that expression of IL-4 would increase during a CRA-induced model of allergic airway inflammation. Indeed, using TB Green Premix Ex Taq II, a relative increase in IL-4 gene expression was accurately detected in lung samples from mice that were sensitized and challenged with CRA. TB Green Premix Ex Taq II provided sensitive and accurate detection of gene expression.
Total RNA was purified from the lungs of C57BL/6 mice that were sensitized and challenged with either PBS (two mice) or CRA (three mice). RNA was extracted using the RNeasy Mini Kit (Qiagen), and cDNA was synthesized from 1 µl of the extracted RNA using Superscript II RT enzyme (Thermo Fisher Scientific) according to the manufacturers' protocols. Two microliters of the reverse transcription reaction (equivalent to 20 ng total RNA per 20-µl qPCR reaction) were used for qPCR with TB Green Premix Ex Taq II according to the recommended protocol. qPCR reactions were run in triplicate using probes for mouse IL-4 and GAPDH on an Applied Biosystems 7500 Real-Time PCR System. The relative gene expression level of IL-4 was determined using the delta/delta Ct method.