BackgroundThe tendency to use bioactive peptides has increased in recent decades, and research would be essential for recognizing the therapeutic effects of peptides present in animals or food resource. In this study, the in vivo antioxidant and antihypertensive properties of peptides HL-7 with the sequence of YLYELR and HL-10 with the sequence of AFPYYGH-HLG were identified from scorpion venom of H. lepturus were evaluated.Methods and resultsTo study the in vivo effects of peptides, D-galactose-induced and DOCA salt-induced mice models were used. The results of the antioxidant assay for both peptides showed that the activity of serum and liver catalase (CAT), as well as superoxide dismutase (SOD) enzymes, was significantly decreased in the D-galactose-induced group (NC), while MDA levels were increased in serum and the liver tissue samples (p<0.01). Compared with the D-galactose-induced mice, the peptide treated mice group had a higher activity of antioxidant enzymes namely CAT and SOD, as well as a lower lipid peroxidation level. Also, the results of antihypertensive activity for both peptides showed that systolic blood pressure (SBP) and diastolic blood pressure (DBP) of the mice treated with the HL-7 and HL-10 peptides were significantly reduced in a dose-dependent manner (p<0.01). The administration of the HL-7 peptide at doses of 2 mg/kg BW (LP1), 5 mg/kg BW (-IP1) and 15 mg/kg BW (HP1) significantly diminished the mean arterial blood pressure (MAP) by 11 mmHg, 31 mmHg and 40.47 mmHg, respectively. Accordingly, treatment of mice with the HL-10 peptide at doses of 2 mg/kg BW (LP2), 5 mg/kg BW (IP2) and 15 mg/kg BW (HP2) considerably lowered the MAP by 8 mmHg, 18.3 mmHg and 21.93 mmHg, respectively.ConclusionOur findings suggest that both the HL-7 and HL-10 peptides could be potentially utilized as antihypertensive and antioxidant components.

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