New features of invasive candidiasis in humans

Amyloid formation by fungi and deposition of serum amyloid P component by the host

Kevin B. Gilchrist, Melissa C. Garcia, Richard E Sobonya, Peter N. Lipke, Stephen A Klotz

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Background. Invasive candidiasis occurs in the gastrointestinal tract, especially in neutropenic patients. We were interested in determining whether invasive fungi formed amyloid in humans as they are known to do in vitro. We also sought to characterize the consequence(s) of such amyloid formation. Methods. Tissue from 25 autopsy patients with invasive candidiasis of the gastrointestinal tract was stained with amyloidophilic dyes and for the presence of serum amyloid P component (SAP). Confirmation of the interaction of SAP and Candida was demonstrated using Candida albicans and mutants for amyloid formation. Results. Amyloid was present on the cellular surface of fungi invading gut tissue. Moreover, SAP bound to the fungal cell walls, confirming the presence of amyloid. In vitro observations showed SAP bound avidly to fungi when amyloid formed in fungal cell walls. An unexpected result was the lack of host neutrophils in response to the invading fungi, not only in neutropenic patients but also in patients with normal or increased white blood counts. Conclusions. We report the first demonstration of functional fungal amyloid in human tissue and the binding of SAP to invading fungi. It is postulated that fungal amyloid, SAP, or a complex of the proteins may inhibit the neutrophil response.

Original languageEnglish (US)
Pages (from-to)1473-1478
Number of pages6
JournalJournal of Infectious Diseases
Volume206
Issue number9
DOIs
StatePublished - Nov 1 2012

Fingerprint

Serum Amyloid P-Component
Invasive Candidiasis
Amyloid
Fungi
Cell Wall
Gastrointestinal Tract
Neutrophils
Candida albicans
Candida
Autopsy
Coloring Agents

ASJC Scopus subject areas

  • Infectious Diseases
  • Immunology and Allergy

Cite this

New features of invasive candidiasis in humans : Amyloid formation by fungi and deposition of serum amyloid P component by the host. / Gilchrist, Kevin B.; Garcia, Melissa C.; Sobonya, Richard E; Lipke, Peter N.; Klotz, Stephen A.

In: Journal of Infectious Diseases, Vol. 206, No. 9, 01.11.2012, p. 1473-1478.

Research output: Contribution to journalArticle

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