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Mp1p homologues as virulence factors in Aspergillus fumigatus

Patrick C Y Woo1,2,3,4,5, Susanna K P Lau1,2,3,4,5, Candy C Y Lau1

  • 1Department of Microbiology, The University of Hong Kong, Hong Kong.

Medical Mycology
|October 10, 2017
PubMed

Insights

The four Mp1p homologues in Aspergillus fumigatus are crucial virulence factors. Combined deletion of these homologues significantly reduced fungal burden and increased survival in a mouse model, indicating their importance in fungal infection.

Area of Science:

  • Medical Mycology
  • Fungal Pathogenesis
  • Molecular Biology

Background:

  • Mp1p is a known virulence factor in Talaromyces marneffei.
  • Aspergillus fumigatus is a significant human pathogen.
  • Understanding fungal virulence factors is critical for developing antifungal strategies.

Purpose of the Study:

  • To investigate the role of four Mp1p homologues (Afmp1p, Afmp2p, Afmp3p, Afmp4p) in Aspergillus fumigatus virulence.
  • To compare the virulence of wild-type A. fumigatus with its Afmp knockdown mutants in a mouse model.

Main Methods:

  • Generation of Afmp1p, Afmp2p, Afmp3p, and Afmp4p knockdown mutants in A. fumigatus.
  • Infection of a mouse model with wild-type and mutant strains.
  • Assessment of survival rates and fungal burden in various organs (brains, kidneys, spleens).

Main Results:

  • Knockdown mutants of AFMP1, AFMP2, and AFMP3 showed rapid mortality similar to wild-type A. fumigatus.
  • AFMP4 knockdown mutant exhibited delayed mortality.
  • Combined knockdown of all four homologues (AFMP1-4) significantly increased survival and reduced fungal burden in brains and kidneys compared to wild-type and AFMP4 mutants.
  • No difference in survival rates was observed between wild-type, AFMP4 knockdown, and AFMP1-4 knockdown mutants, suggesting a different virulence mechanism than in T. marneffei.

Conclusions:

  • The four Mp1p homologues (Afmp1p, Afmp2p, Afmp3p, Afmp4p) in A. fumigatus act in combination as important virulence factors.
  • These homologues do not appear to mediate virulence by enhancing survival within macrophages, unlike in T. marneffei.
  • Targeting these Mp1p homologues could be a potential strategy for controlling A. fumigatus infections.

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