Generation of CCSP/Fizz1 transgenic mice. (A) Gene targeting strategy for generating conditional CCSP/Fizz1 transgenic mice. TetO-CMV Fizz1+/+ mice were generated by cloning full length Fizz1 cDNA from mouse lung RNA and inserting into the (TetO)7-CMV promoter. CCSP/Fizz1 transgenic mice were produced by mating single transgenic CCSP/- mice with (TetO)7-CMV Fizz1+/+ mice. To induce Fizz1 expression in bitransgenic mice were administered doxycycline (Dox) as described in methods. (B) Western blot shows Fizz1 overexpression in the lungs of CCSP/Fizz1 mice on Dox for two weeks. rFizz1 is a lane containing purified Fizz1 (Peprotech) loaded as a positive control. Lanes 1, 2 are duplicate samples. The expressed Fizz1 in Dox treated transgenic mice migrated identically to the Fizz1 marker compared to CCSP/Fizz1 mice without Dox treatment. The relative intensity of the bands in the On Dox lanes was increased about 14.1 fold.