Applied Microbiology and Biotechnology

, Volume 97, Issue 18, pp 8273–8281

Cholesterol-lowering probiotics: in vitro selection and in vivo testing of bifidobacteria

  • Alessandra Bordoni
  • Alberto Amaretti
  • Alan Leonardi
  • Elisa Boschetti
  • Francesca Danesi
  • Diego Matteuzzi
  • Lucia Roncaglia
  • Stefano Raimondi
  • Maddalena Rossi
Applied microbial and cell physiology

Abstract

Thirty-four strains of bifidobacteria belonging to Bifidobacterium adolescentis, Bifidobacterium animalis, Bifidobacterium bifidum, Bifidobacterium breve, Bifidobacterium longum, and Bifidobacterium pseu-docatenulatum were assayed in vitro for the ability to assimilate cholesterol and for bile salt hydrolase (BSH) against glycocholic and taurodeoxycholic acids (GCA and TDCA). Cholesterol assimilation was peculiar characteristic of two strains belonging to the species B. bifidum (B. bifidum MB 107 and B. bifidum MB 109), which removed 81 and 50 mg of cholesterol per gram of biomass, being the median of specific cholesterol absorption by bifidobacteria 19 mg/g. Significant differences in BSH activities were not established among bifidobacterial species. However, the screening resulted in the selection of promising strains able to efficiently deconjugate GCA and TDCA. No relationship was recognized between BSH phenotype and the extent of cholesterol assimilation. On the basis of cholesterol assimilation or BSHGCA and BSHTDCA activities, B. bifidum MB 109 (DSMZ 23731), B. breve MB 113 (DSMZ 23732), and B. animalis subsp. lactis MB 2409 (DSMZ 23733) were combined in a probiotic mixture to be fed to hypercholesterolemic rats. The administration of this probiotic formulation resulted in a significant reduction of total cholesterol and low-density cholesterol (LDL-C), whereas it did not affect high-density cholesterol (HDL-C) and HDL-C/LDL-C ratio.

Keywords

Bifidobacterium Probiotic Cholesterol Bile salt hydrolase In vivo In vitro 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Alessandra Bordoni
    • 1
  • Alberto Amaretti
    • 2
  • Alan Leonardi
    • 2
  • Elisa Boschetti
    • 3
  • Francesca Danesi
    • 1
  • Diego Matteuzzi
    • 4
  • Lucia Roncaglia
    • 2
  • Stefano Raimondi
    • 2
  • Maddalena Rossi
    • 2
  1. 1.Department of Agro-Food Sciences and TechnologiesUniversity of BolognaCesenaItaly
  2. 2.Department of Life SciencesUniversity of Modena and Reggio EmiliaModenaItaly
  3. 3.Department of Biomedical and Neuromotor ScienceUniversity of BolognaBolognaItaly
  4. 4.Department of Pharmaceutical SciencesUniversity of BolognaBolognaItaly

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