Angiotensin is an oligopeptide in the blood that causes vasoconstriction， increased blood pressure， and release of aldosterone from the adrenal cortex. It is a powerful dipsogen. It is derived from the precursor molecule angiotensinogen， a serum globulin produced in the liver. It plays an important role in the renin-angiotensin system.
The protein encoded by this gene， pre-angiotensinogen or angiotensinogen precursor， is expressed in the liver and is cleaved by the enzyme renin in response to lowered blood pressure. The resulting product， angiotensin I is then cleaved by angiotensin converting enzyme（ACE) to generate the physiologically active enzyme angiotensin II. The protein is involved in maintaining blood pressure and in the pathogenesis of essential hypertension and preeclampsia.
