Analysis on the relationship and mechanism of high blood pressure and vascular aging on the condition that the gender and age matches.

OBJECTIVE: The relationship between hypertension and the mechanism of the expression of T-lymphocyte Kv1.3 channels in vascular aging has been analyzed in this study based on the gender and age matches’ principle. PATIENTS AND METHODS: Thirty patients have been consecutively chosen with vascular aging caused by hypertension (group A), while 30 cases of high blood pressure not merged with vascular aging (group B) were chosen, and 30 cases of healthy volunteers (group C), conforming to gender and age 1:1 and the closest matching principle, were studied. The aim of this study was to separate the peripheral blood mononuclear cells and give intervention of 0.2 nmol/L ANGII to CD4 + T-lymphocytes, and store them in the incubator 48 h. The difference of Kv1.3 channel current of CD4 + T-lymphocyte, mRNA, angiotensin receptor (AT1R) protein mRNA, and IFN-γ density has also been compared. RESULTS: The membrane capacitance, peak current, and current density of group A, are higher than those of the other two groups, and the differences have statistical significance (p<0.05). After adding ANGII intervention to group A, the expression levels of T-lymphocyte Kv1.3 potassium channels mRNA, AT1R mRNA, and IFN-γ are significantly increased, so that the difference has statistical significance p<0.05, while the other two groups have no significant change (p>0.05). The levels of Kv1.3 potassium channels, AT1R mRNA, and IFN-γ of group A before and after the intervention are significantly higher than those of the other two groups, and the differences are statistically significant (p<0.05). CONCLUSIONS: Vascular aging caused by hypertension may be linked to the increase of Kv1.3 potassium channel activity of T-lymphocyte, while ANGII can improve the high expression of Kv1.3 potassium channel and AT1R, to stimulate lymph cells to secrete IFN-γ. [ABSTRACT FROM AUTHOR]