AGTR1 and Hypertension: Studies have found that an autoimmune reaction is one important cause of hypertension [14], and the serum levels of β1 adrenergic receptor autoantibodies (β1-AA) and angiotensin II type-1 receptor autoantibodies (AT1-AA) [15, 16] in patients with dilated cardiomyopathy (DCM) are higher than those in normal control patients [17].