cells were transfected
with Qiagen Flexi Tube siRNA for rat SHIP, SHP-1, and SHP-2 or Lyn
SmartPool siRNA from Dharmacon. The Amaxa Nucleofector and Cell Line
Nucleofector kit T (Lonza Cologne GmbH) were utilized according to
the manufacturer’s protocol. Cells were transfected with 0.25–0.5
μg of siRNA per 1 million cells and plated in regular growth
medium. The cultures were allowed to rest for 24 h before experiments
were performed and the efficiency of knockdown was determined via
immunoblot analyses.