Abstract
Objective: To investigate the association between plasma free amino acids (PFAAs) profile changes, vitamin D concentration and hypertension and evaluate the clinical utility of this association for nascent hypertension before the development of complications.
 Methods: 70 subjects were enrolled in this study; 50 of them were hypertensive (25 were with uncontrolled hypertensive and 25 were with controlled hypertensive), the other 20 subjects were healthy controls.
 Results: Circulating levels of Branched chain amino acids (BCAAs); (valine, leucine, and isoleucine), Aromatic amino acids (AAAs); (phenylalanine, tyrosine, and tryptophan), homocysteine, aspartic, ornithine, asparagine and lysine were elevated significantly in both uncontrolled and controlled hypertensive subgroups in comparison with control group. On the contrary, the results showed marked decline in the concentration of threonine, serine, methionine, and arginine amino acids in the two hypertensive subgroups compared to control group. Moreover, there was a marked decrease of vitamin D level in hypertensive population in comparison with control.
 Conclusion: There is obvious association between PFAAs profile changes, hypovitaminosis D and hypertension.
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