한국인 모유영양아로부터 분리한 Enterococcus faecium ID9201의 콜레스테롤 저하효과

We selected lactic acid bacteria to reduce cholesterol levels in vitro and in vivo. Among the 140 strains tested, a strain ID9201 was shown to reduce cholesterol in the spent medium over 30% and to increase cholesterol in cell pellet. A strain ID9201 isolated from breast milk-fed Korean infant feces was identified as Enterococcus faecium on the basis of morphological analysis, biochemical analysis (API kit), and 16S rDNA sequence analysis. A freeze-dried powder of the strain was fed to Sprague-Dawley(SD) rats with high cholesterol diet for 6 wk. In the control group fed cholesterol enriched diet without probiotics, the serum cholesterol increased by 1.9 times in comparison with the initial value. Among the test group, ID9201 group showed the lowest cholesterol increase, 1.5 times of initial serum cholesterol, as in the blank group fed normal diet without probiotics. Based on these data, we assumed that ID9201 inhibited intestinal absorption of dietary cholesterol.