Gastrointestinal colonisation and systemic spread of Candida albicans in mice treated with antibiotics and prednisolone

Michiyo Kobayashi-Sakamoto, Riyoko Tamai, Emiko Isogai, Yusuke Kiyoura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Normally, Candida albicans is a commensal microbe that resides in the human oral cavity, gut and vagina. However, the fungus can cause mucosal and systemic infections in immunocompromised individuals. The mechanism by which local mucosal infections progress to systemic candidiasis is poorly understood. Here, a murine model of gastrointestinal (GI) candidiasis was developed by inoculation of the oral cavity, followed by treatment with tetracycline (TC) and prednisolone (PSL). Temporal progression from a local infection of the oral cavity to a systemic infection was then monitored. Histological analysis of tissues from mice treated with both TC and PSL revealed massive infiltration of the tongue and stomach by hyphae. PSL increased the fungal burden in the tongue, stomach and small intestine, and facilitated dissemination to the spleen, kidney and liver within 3 days post-infection. Treatment with both TC and PSL supressed interferon (IFN)-γ and interleukin (IL)-17 (cytokines that play key roles in host defence against fungal infection) levels in the tongue, which were induced by C. albicans infection. In addition, the mucosal layer of the small intestine of mice treated with both TC and PSL was almost destroyed by the fungal infection; this may be a critical event that allows passage of the fungus across the mucosa and into the systemic circulation. Thus, this mouse model is useful for studying mechanisms underlying progression of C. albicans from a local infection of the oral cavity to a systemic infection in immunocompromised individuals.

Original languageEnglish
Pages (from-to)191-199
Number of pages9
JournalMicrobial Pathogenesis
Volume117
DOIs
Publication statusPublished - 2018 Apr

Keywords

  • Candida albicans
  • Gastrointestinal candidiasis
  • IFN-γ
  • IL-17A
  • Prednisolone
  • Translocation

ASJC Scopus subject areas

  • Microbiology
  • Infectious Diseases

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