Telmisartan Lowers Elevated Blood Pressure in Psoriatic Mice without Attenuating Vascular Dysfunction and Inflammation.

Background: Psoriasis is hallmarked by vascular dysfunction, arterial hypertension, and an increased risk for cardiovascular diseases. We have shown recently that skin-driven interleukin (IL)-17A expression promotes psoriasis-like disease in mice, and this is associated with vascular inflammation, vascular dysfunction, and hypertension. As an intensive risk-factor reduction is recommended for psoriasis patients, we aimed to elucidate the impact of the angiotensin II receptor type 1 (AT1) antagonist telmisartan in a mouse model of severe psoriasis-like skin disease. Methods and Results: Elevated blood pressure measured by tail-cuff plethysmography in mice with keratinocyte-specific IL-17A overexpression (K14-IL-17A(ind/+) mice) was significantly reduced in response to telmisartan. Importantly, vascular dysfunction, as assessed by isometric tension studies of isolated aortic rings, vascular inflammation measured by flow cytometry analysis of CD45(+)CD11b(+) immune cells, as well as the increased peripheral oxidative stress levels assessed by L-012-enhanced chemiluminescence were not attenuated by telmisartan treatment of K14-IL-17A(ind/+) mice, nor was the persisting skin inflammation. Conclusion: We provide first evidence for an effective antihypertensive treatment in experimental psoriasis by AT1 blockade, but without any impact on vascular inflammation and dysfunction in our mouse model of severe psoriasis-like skin disease. This suggests that vascular function and inflammation in psoriasis might not be attenuated as long as skin inflammation persists.