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No Chance to Survive: Mo-CBP3-PepII Synthetic Peptide Acts on Cryptococcus neoformans by Multiple Mechanisms of

Tawanny K B Aguiar1, Felipe P Mesquita2, Nilton A S Neto1

  • 1Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza 60451-970, CE, Brazil.

Antibiotics (Basel, Switzerland)
|February 25, 2023
PubMed

Insights

The synthetic peptide Mo-CBP3-PepII effectively kills Cryptococcus neoformans by inducing oxidative stress and disrupting cellular functions. This multi-pronged attack on fungal cells suggests potential for new drug development against resistant infections.

Area of Science:

  • Microbiology
  • Biochemistry
  • Drug Discovery

Background:

  • Multidrug-resistant *Cryptococcus neoformans* poses a significant threat to immunocompromised individuals, leading to high mortality rates.
  • The synthetic peptide *Mo*-CBP3-PepII has shown potent anticryptococcal activity at low concentrations.

Purpose of the Study:

  • To elucidate the detailed mechanisms of action of *Mo*-CBP3-PepII against *Cryptococcus neoformans*.
  • To provide insights into how *Mo*-CBP3-PepII induces cell death in *C. neoformans*.

Main Methods:

  • Light and fluorescence microscopy were used to observe cellular changes.
  • Enzymatic activity assays assessed key enzymes like SOD, APX, CAT, and LDH.
  • Proteomic analysis identified alterations in protein abundance.
  • Experiments included treatment with ascorbic acid to investigate the role of reactive oxygen species.

Main Results:

  • *Mo*-CBP3-PepII induced accumulation of superoxide anion and hydrogen peroxide, while reducing SOD, APX, and CAT activity.
  • The peptide's anticryptococcal activity was abolished by ascorbic acid, indicating the crucial role of reactive oxygen species (ROS).
  • Inhibition of lactate dehydrogenase (LDH) and ergosterol biosynthesis, along with cytochrome c decoupling from mitochondrial membranes, were observed.
  • Proteomic analysis revealed decreased protein levels involved in energy metabolism, DNA/RNA metabolism, pathogenicity, protein metabolism, cytoskeleton, and cell wall organization.

Conclusions:

  • *Mo*-CBP3-PepII exhibits multiple mechanisms of action against *C. neoformans*, including ROS generation and disruption of essential cellular processes.
  • The multifaceted attack by *Mo*-CBP3-PepII may hinder the development of resistance in *C. neoformans*.
  • This peptide represents a promising candidate for the development of novel therapeutic agents against *Cryptococcus neoformans* infections.
Keywords:
alternative drugscryptococcosisoxidative stresssynthetic peptides

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