Your body has a dual-purpose system for blood pressure and healing

Science · Published 28 October 2026 Swipe more like this →

In short: Most people know the renin-angiotensin-aldosterone system (RAAS) as a simple regulator of blood pressure. However, it is actually a sophisticated biological switch. Depending on which pathway is activated, it can either drive chronic disease like inflammation and scarring, or act as a vital defense mechanism to promote tissue repair.

The RAAS is a complex enzymatic cascade involving the kidneys, liver, lungs, and adrenal glands to maintain fluid balance and cardiovascular health. It begins when the kidneys secrete renin, an aspartyl protease. Renin catalyzes the conversion of angiotensinogen into angiotensin I, which is subsequently processed into angiotensin II. While this pathway is well-known for its role in circulation, recent research highlights that it functions through two distinct branches with opposing effects. One branch promotes deleterious outcomes, including high blood pressure, inflammation, and fibrosis (tissue scarring). This is primarily mediated by angiotensin II binding to specific receptors like AT1R. Conversely, an alternative pathway involving molecules like angiotensin-(1–7) binds to different receptors, such as MasR, to provide protective actions.

This 'dual-role' means the system can simultaneously contribute to disease progression and support healing, depending on the specific molecular signaling and receptor crosstalk involved. The implications of this complexity are vast. Beyond the heart, RAAS influences cancer biology—affecting cell growth, migration, and metastasis—as well as immune regulation and coagulation. Fibrosis development is altered within the liver, whereas canine inflammatory bowel disease might be impacted by its presence in the intestines. Researchers seek to create precise treatments that inhibit damaging pathways and boost innate defenses by analysing these distinct tissue-level processes.

The RAAS is not just a cardiovascular regulator; it is a multi-organ system influencing inflammation, cancer, and tissue repair. It operates via a dual-branch mechanism where different molecules like angiotensin II and angiotensin-(1–7) bind to specific receptors to produce either harmful or protective effects. This complexity allows for potential new treatments that inhibit disease-promoting pathways while supporting healing.

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