Sulfatase 1 mediates the attenuation of Ang II-induced hypertensive effects by CCL5 in vascular smooth muscle cells from spontaneously hypertensive rats.

Extracellular sulfatases, sulfatase 1 (Sulf1) and sulfatase 2 (Sulf2), play a pivotal role in cell signaling and carcinogenesis. Chemokine CCL5 inhibits Ang II-induced hypertensive mediators via angiotensin II (Ang II) type 2 receptor (AT₂ R) pathway in vascular smooth muscle cells (VSMCs) from spontaneously hypertensive rats (SHR). In this study, we investigated the effect of Sulfs on anti-hypertensive effects of CCL5 in SHR VSMCs. CCL5 attenuated Ang II-induced inhibition of sulfatase activity in SHR VSMCs. Inhibition of Ang II-induced 12-lipoxygenase (12-LO) and endothelin-1 (ET-1) expression by CCL5 was reduced in Sulf1 small interfering RNA (siRNA)-transfected SHR VSMCs. In addition, attenuation of Ang II-induced dimethylarginine dimethylaminohydrolase-1 (DDAH-1) inhibition by CCL5 was reduced in Sulf1 siRNA-transfected SHR VSMCs. Downregulation of Sulf2 did not affect inhibitory effects of CCL5 on Ang II-induced 12-LO and ET-1 expression and Ang II-induced inhibition of DDAH-1 expression in SHR VSMCs. Downregulation of Sulf1 abrogated the expression of CCL5-induced AT₂ R messenger RNA (mRNA) and synergistic effect of CCL5 on Ang II-induced AT₂ R expression in SHR VSMCs. These findings suggest that Sulf1 is a potential up-regulatory factor in anti-hypertensive actions of CCL5 via AT₂ R pathway on Ang II-induced hypertensive effects in SHR VSMCs.

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