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DNA Vector-Based shRNA-Expression Systems 229Fig. 3. Constructs of improved DNA vector-based shRNA-expression systems. ThePuro R is cloned between restriction enzyme ClaI and HindIII sites in the pHsH1, pHsU6,pMmH1, and pMmU6 constructs as a stuffer that is convenient for the cloning of theshRNA-coding sequences. The resulting improved DNA constructs are redesignated aspHsH1puro (A), pHsU6puro (B), pMmH1puro (C), and pMmU6puro (D) vectors.5. 3% Paraformaldehyde (Merck, Darmstadt, Germany).6. 0.5% Triton X-100 (Merck, Darmstadt, Germany).7. Bicinchoninic acid assay (Pierce, Rockford, IL) stored at room temperature.8. Bovine serum albumin (Sigma, St Louis, MO) stored at room temperature.9. Dual-luciferase reporter assay system (Promega) stored in aliquots at −80°C.10. Enhanced chemiluminescence Western blotting detection reagents (AmershamBiosciences, Arlington Heights, IL) stored at 4°C.2.5. Instruments1. Microcentrifuges (Heraeus Biofuge Pico and Heraeus Biofuge Fresco, KendroLaboratory Products, Sollentum, Germany).2. Dri-block heater (Techne DRI-BLOCK DB 20, Techne, Cambridge, UK).

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