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Flow Cytometry01:23

Flow Cytometry

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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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Flow Cytometry-Based Method To Detect Persisters in Candida albicans.

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  • 1Department of Natural Product Chemistry, Key Lab of Chemical Biology of Ministry of Education, Shandong University, Jinan City, Shandong Province, China.

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Researchers developed a new method to visualize drug-tolerant persister cells within Candida albicans biofilms. This technique uses green fluorescent protein (GFP) and propidium iodide (PI) staining to identify these resilient fungal populations.

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Area of Science:

  • Microbiology
  • Mycology
  • Antifungal Research

Background:

  • Candida albicans biofilms present a significant clinical challenge due to the presence of persister cells.
  • These persister cells exhibit high tolerance to antifungal agents, hindering effective treatment.
  • Current methods for identifying persister cells are limited.

Purpose of the Study:

  • To establish a novel and direct method for visualizing and quantifying persister cells in Candida albicans biofilms.
  • To characterize the phenotypic properties of antifungal-tolerant persister cells.

Main Methods:

  • Utilized a green fluorescent protein (GFP) labeled Candida albicans strain by mutating the TDH3 gene.
  • Employed propidium iodide (PI) staining to differentiate viable from non-viable cells.
  • Combined GFP labeling and PI staining for direct visualization using fluorescence microscopy and quantification via flow cytometry.

Main Results:

  • Successfully established a method to identify persister cells as GFP-positive [GFP (+)] and PI-negative [PI (-)].
  • Demonstrated that Amphotericin B-tolerant persisters possess these distinct characteristics.
  • Quantified persister cell populations using flow cytometry.

Conclusions:

  • The developed GFP and PI staining method provides an effective means to directly observe and measure antifungal-tolerant persister cells in Candida albicans.
  • This technique facilitates a deeper understanding of persister cell biology and tolerance mechanisms.
  • Offers a valuable tool for screening antifungal compounds and evaluating treatment strategies against Candida albicans biofilms.