I used different times and doses of angiotensin ii to stimulate vessel smooth muscle cells and then to test AT-1 by western blot, but none of the results had any differences with control. I just didn't know the reason.
Thanks for your advices, I have some other questions ,can you tell me what dose of angiotensin ii you use in your experiment ? Since the half life of angiotensin ii is about 6 hours ,do you add another dose or change the medium ? Thanks for your reply.