The role of the immune system in hypertension.

The mechanisms that cause hypertension remain elusive despite more than a century of investigation. Some of its triggers include aging, sex, salt, diet, stress, experience with adversity, socio-cultural-economic disparities, and poor-quality sleep. The renin-angiotensin-aldosterone and the endothelin systems and other hormones contribute to varying degrees to the rise in BP and target organ damage. It has become increasingly recognized that inflammation and the innate and adaptive immune systems play a role in the etiopathogenesis of hypertension. We review here the participation of different cellular and molecular (genetic and epigenetic) mechanisms that play a role in hypertension via the immune system, including neutrophil extracellular traps, memory T cells, and aldosterone-modulated trained immunity mediated by monocytes/macrophages. Molecular mechanisms, including the effects of neutrophil gelatinase-associated lipocalin as an immunomodulator, and the role of isolevoglandins in mediating oxidative stress-induced activation of the adaptive immune system are analysed. We conclude by summarizing potential therapeutic avenues to address inflammation in hypertension.