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Leonurus sibiricus  L. has been used as a traditional and medicinal herb for many years in Asia and Europe. This species is known to have antibacterial, anti-inflammatory, and antioxidant activity and has demonstrated a reduction of intracellular reactive oxygen species. All tested extracts of  L. sibiricus  showed protective and DNA repair stimulating effects in Chinese hamster ovary (CHO) cells exposed to H 2 O 2 . Preincubation of the CHO cells with 0.5 mg/mL of plant extracts showed increased expression level of antioxidant genes ( SOD2, CAT,  and  GPx ). LC-MS/MS and HPLC analyses revealed the presence of nine phenolic compounds in  L. sibiricus  plant extracts: catechin, verbascoside, two flavonoids (quercetin and rutin), and five phenolic acids (4-hydroxybenzoic acid, chlorogenic acid, caffeic acid,  p -coumaric acid, and ferulic acid). The roots and aerial parts of  in vitro L. sibiricus  plant extracts, which had the strongest antioxidant properties, may be responsible for stimulating CHO cells to repair oxidatively induced DNA damage, as well as protecting DNA via enhanced activation of the antioxidant genes ( SOD2, CAT,  and  GPx ) regulating intracellular antioxidant capacity. The content of phenolic compounds in  in vitro  raised plants was greater than the levels found in plants propagated from seeds.

oxidative medicine and cellular longevity

The Effect of<i>Leonurus sibiricus</i>Plant Extracts on Stimulating Repair and Protective Activity against Oxidative DNA Damage in CHO Cells and Content of Phenolic Compounds

The Effect ofLeonurus sibiricusPlant Extracts on Stimulating Repair and Protective Activity against Oxidative DNA Damage in CHO Cells and Content of Phenolic Compounds