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  • Title: The effect of probiotic-fermented soy milk on enhancing the NO-mediated vascular relaxation factors.
    Author: Cheng CP, Tsai SW, Chiu CP, Pan TM, Tsai TY.
    Journal: J Sci Food Agric; 2013 Mar 30; 93(5):1219-25. PubMed ID: 22996620.
    Abstract:
    BACKGROUND: Soy milk is one of the common soy-based foods in Asia. In this study the effects of soy milk fermented with selected probiotics on nitric oxide (NO)-mediated vascular relaxation factors in cell model systems were investigated. RESULTS: Soy milk fermented with Lactobacillus plantarum TWK10 or Streptococcus thermophilus BCRC 14085 for 48 h showed a greater transformation of glucoside isoflavones to aglycone isoflavones (P < 0.05). An increase in aglycone isoflavones in ethanol extracts from fermented soy milk stimulated NO production and endothelial NO synthase (eNOS) activity in human umbilical vein endothelial cells. It also had a stimulating effect on superoxide anion scavenging and prostaglandin E₂ production. In addition, it enhanced mRNA expression of the E-prostanoid 4 receptor in rat thoracic aorta smooth muscle cells. Moreover, a small amount of O₂⁻ induced by water extracts from fermented soy milk at low concentration (1 mg mL⁻¹) increased the content of calcium ions and activated eNOS, thereby promoting NO production and the coupling state of eNOS. CONCLUSION: Soy milk fermented with selected probiotics promotes the relaxation factors of vascular endothelial cells and can be applied in the development of functional foods.
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