Western blot analysis of extracts from A-431 cells, serum-starved overnight and untreated or treated with hEGF #8916 (100 ng/ml, 5 min) either with or without Erlotinib pre-treatment (1 hr) at the indicated concentrations, using Phospho-EGF Receptor (Tyr1068) (D7A5) XP® Rabbit mAb #3777 (upper) or EGF Receptor (D38B1) XP® Rabbit mAb #4267 (lower).
Chemical structure of Erlotinib.
Erlotinib is supplied as a lyophilized powder. For a 10 mM stock, reconstitute the 10 mg in 2.54 ml DMSO. Working concentrations and length of treatment can vary depending on the desired effect, but it is typically used as a pretreatment at 0.1-10 µM for 0.5-2 hours prior to treating with a stimulator. It can also be used alone, with varying treatment times lasting up to 24 hours. Soluble in DMSO at 100 mg/ml, soluble in ethanol at 10 mg/ml with warming; very poorly soluble in water with a maximum solubility ~5-20 µM.
Store lyophilized or in solution at -20ºC, desiccated. In lyophilized form, the chemical is stable for 24 months. Once in solution, use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.
Erlotinib is a novel and potent ATP-competitive inhibitor of the EGFR kinase pathway. It inhibited EGFR autophosphorylation with an IC50 of 20 nM in vitro and inhibit purified EGFR kinase with an IC50 of 2 nM (1). Erlotonib is greater than 1000-fold more selective for EGFR than c-src and v-abl (1), ErbB-2, and ErbB-4 (2). Studies have shown that erlotinib inhibits growth and induces G1 cell cycle arrest in multiple cell types, many of which overexpress EGFR (1,3-5).
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