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Statin treatment before stroke reduces pro-inflammatory cytokine levels after stroke.

OBJECTIVE: In this clinical case-control study, we investigated statin treatment in stroke patients on a range of inflammatory effectors in peripheral blood. We focus on RhoA GTPase and its downstream effectors as a future inflammatory target in stroke treatment.

METHODS: Data from 10 patients already on statins at stroke onset (Pre-S group) was compared with data from both 29 patients starting statin treatment right after stroke onset (Post-S group) and with 8 healthy controls. In T-cells isolated from stroke patients, we analyzed the activity of the main cytoskeletal regulator RhoA GTPase and its downstream effectors: rho-associated protein kinase (ROCK), myosin phosphatase targeting protein subunit 1 (pMYPT1), myosin light chain kinase (pMLC) and cofilin. In the blood samples, we further determined levels of 12 key plasma cytokines as well as C-reactive protein (CRP) and kallikrein.

RESULTS: Compared to healthy controls, the Post-S group achieved significantly higher RhoA and ROCK activities, while the Pre-S did not differ from controls. Levels of pMYPT1, pMLC and cofilin did not differ from controls in the Pre-S and Post-S groups. At day 90 after stroke, interferon γ and IL-18 were significantly increased in the Post-S group compared to the Pre-S group. We found a positive correlation between CRP and NIHSS, whereas kallikrein levels showed no correlation with NIHSS at any of the days.

CONCLUSION: Stroke induces changes in the RhoA-ROCK pathway in T-cells. CRP and NIHSS score correlated positively in the study. Statins may have an anti-inflammatory effect as statin treatment before stroke reduces post-stroke pro-inflammatory levels. RhoA GTPase and its downstream effectors are possibly the key to improve statin treatment in stroke.

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