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Assessment of cell adhesion, cell surface hydrophobicity, autoaggregation, and lipopolysaccharide-binding properties of live and heat-killed Lactobacillus acidophilus CBT LA1

락토바실러스 아시도필러스 CBT LA1 생균과 사균체의 세포부착력, 자가응집력, 소수성 상호작용력, LPS 결합력에 대한 평가

  • Received : 2015.07.28
  • Accepted : 2015.08.18
  • Published : 2015.09.30

Abstract

Although studies on probiotics have been performed mostly with viable microbes, the beneficial functions of dead or heat-killed form of probiotic strains have also been examined. In this study, live and heat-killed forms of Lactobacillus acidophilus CBT LA1 were investigated in vitro and in vivo to evaluate the properties necessary for gut barrier protection. Cell surface hydrophobicity (CSH), autoaggregation (AA), cell adhesion, and lipopolysaccharide (LPS)-binding properties were evaluated. In addition, the suppressive effect on LPS-induced interleukin (IL)-8 expression was investigated in HT-29 cells. To identify optimal conditions for CBT LA1 to adhere to HT-29 cells, CBT LA1 cells were heat-treated at 80, 85, 90, 95, 100, or $121^{\circ}C$ for 10 min; cells treated at $80^{\circ}C$ for 10 min showed the highest adhesion. Heat-killed bacteria at $80^{\circ}C$ showed higher levels of LPS-binding, CSH, AA, adhesion to HT-29, and suppression of IL-8 expression than did live CBT LA1. In vivo imaging was performed to evaluate the ability of live or heat-killed CBT LA1 to remove LPS from the intestine in a rat model of infection. At 16 h after infection, fluorescence from FITC-conjugated LPS had mostly disappeared from the intestine of the rats administered with live or heat-killed CBT LA1; the effect was greater with heat-killed CBT LA1 at $80^{\circ}C$. These results suggest that heat-killed CBT LA1 as well as its live form can be applied as a pharmabiotic for protection of the gut barrier.

Keywords

Lactobacillus acidophilus CBT LA1;cell adhesion;heat-killed bacteria;LPS-binding property;pharmabiotic;probiotics

Acknowledgement

Grant : 식중독균 제어를 위한 항생제 동시투여 가능 사균체 개발

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