Red-Emissive Guanylated Polyene-Functionalized Carbon Dots Arm Oral Epithelia against Invasive Fungal Infections

ACS Appl Mater Interfaces. 2019 Dec 18;11(50):46591-46603. doi: 10.1021/acsami.9b18003. Epub 2019 Dec 6.


Oral candidiasis as a highly prevalent and recurrent infection in medically compromised individuals is mainly caused by the opportunistic fungal pathogen Candida albicans. This epithelial infection, if not controlled effectively, can progress to life-threatening systemic conditions and complications. The efficacy of current frontline antifungals is limited due to their poor bioavailability and systemic toxicity. As such, an efficient intervention is essential for controlling disease progression and recurrence. Herein, a theranostic nanoplatform (CD-Gu+-AmB) was developed to track the penetration of antifungals and perturb the invasion of C. albicans at oral epithelial tissues, via decorating the homemade red-emissive carbon dots (CD) with positively charged guanidine groups (Gu+) followed by conjugation with antifungal polyene (amphotericin B, AmB) in a reacting site-controllable manner. The generated CD-Gu+-AmB favorably gathered within the Candida cells and exhibited potent antifungal effects in both planktonic and biofilm forms. It selectively accumulated in the nuclei of human oral keratinocytes and exhibited undetectable toxicity to the host cells. Moreover, we reported for the first time the penetration and exfoliation profiles of CD in a three-dimensional organotypic model of human oral epithelial tissues, demonstrating that the extra- and intracellular accumulation of CD-Gu+-AmB effectively resisted the invasion of C. albicans by forming a "shielding" layer throughout the entire tissue. This study establishes a multifunctional CD-based theranostic nanoplatform functioning as a traceable and topically applied antifungal to arm oral epithelia, thereby shedding light on early intervention of mucosal candidiasis for oral and general health.

Keywords: Candida albicans; amphotericin B; carbon dots; drug delivery; oral epithelium.

MeSH terms

  • Amphotericin B / chemistry
  • Amphotericin B / pharmacology*
  • Antifungal Agents / chemistry
  • Antifungal Agents / pharmacology*
  • Biofilms / drug effects
  • Biological Availability
  • Candida albicans / drug effects
  • Candida albicans / pathogenicity
  • Candidiasis / drug therapy*
  • Candidiasis / microbiology
  • Carbon / chemistry
  • Epithelial Cells / drug effects
  • Epithelial Cells / microbiology
  • Guanosine Monophosphate / chemistry
  • Humans
  • Invasive Fungal Infections / drug therapy*
  • Invasive Fungal Infections / microbiology
  • Keratinocytes / drug effects
  • Microbial Sensitivity Tests
  • Mouth Mucosa / drug effects
  • Mouth Mucosa / microbiology
  • Polyenes / chemistry
  • Polyenes / pharmacology
  • Quantum Dots / chemistry


  • Antifungal Agents
  • Polyenes
  • Carbon
  • Amphotericin B
  • Guanosine Monophosphate