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Background . Soluble guanylyl cyclases (sGCs) and Ras homolog gene family, member A (rhoA)/Ras homolog gene family kinase(rho-kinase) plays a role in vascular smooth muscle relaxation in subarachnoid hemorrhage (SAH). It is of interest to examine the effect of MLB on rhoA/ROCK and sGC/cGMP/PKG expression.  Methods . A rodent SAH model was employed. Tissue samples were for sGC  α  1, sGC  β  1, PKG, rhoA, ROCK (Western blot), and cGMP (ELISA) measurement.  Results . MLB morphologically improved convolution of the internal elastic lamina, distortion of endothelial wall, and necrosis of the smooth muscle in the SAH rats. Expressed cGMP, sGC  α  1, sGC  β  1, and PKG in the SAH groups were reduced ( P  < 0.01), and MLB precondition significantly induced cGMP, sGC α 1, sGC β 1, and PKG. L-NAME reversed the vasodilation effect of MLB, reduced the bioexpression of PKG and cGMP ( P  < 0.01), and tends to reduce sGC α 1 level and induce rhoA, ROCK level in MLB precondition + SAH groups.  Conclusion . These results demonstrate that sGC/cGMP/PKG and NO/ET pathways play pivotal roles in SAH-induced vasospasm. Through activating sGC/cGMP/PKG pathway and partially by inactivating rho-kinase in a NO-dependent mechanism, MLB shows promise to be an effective strategy for the treatment of this disease entity.

Magnesium Lithospermate B, an Active Extract ofSalvia miltiorrhiza, Mediates sGC/cGMP/PKG Translocation in Experimental Vasospasm