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Complementary Use of Microscopic Techniques and Fluorescence Reading in Studying Cryptococcus-Amoeba Interactions

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Curcumin effect on Acanthamoeba triangularis encystation under nutrient starvation.

Rachasak Boonhok¹, Suthinee Sangkanu², Suganya Phumjan¹

¹Department of Medical Technology, School of Allied Health Sciences, and Research Excellence Center for Innovation and Health Products (RECIHP), Walailak University, Thai Buri, Nakhon Si Thammarat, Thailand.

|July 11, 2022

Summary

This summary is machine-generated.

Curcumin treatment prevents Acanthamoeba triangularis from forming cysts by affecting autophagy-related gene expression. This suggests curcumin may inhibit encystation through molecular pathways, warranting further research.

Keywords:

Acanthamoeba triangularis Autophagy Curcumin Encystation Nutrient Starvation Real-time PCR

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Area of Science:

Parasitology
Molecular Biology
Pharmacology

Background:

Curcumin, derived from turmeric, exhibits health benefits and recently discovered amoebicidal activity against Acanthamoeba triangularis.
Intracellular pathways, including autophagy, involved in A. triangularis encystation following curcumin treatment remain uncharacterized.

Purpose of the Study:

To investigate curcumin's effect on A. triangularis survival under nutrient starvation and nutrient-rich conditions.
To evaluate A. triangularis encystation and associated changes in Acanthamoeba autophagy at the mRNA level.

Main Methods:

Acanthamoeba triangularis treated with sublethal curcumin doses under varying nutrient conditions.
Microscopic examination of cyst formation and vacuolization.
Real-time PCR to assess transcriptional expression of autophagy-related and encystation-related genes.

Main Results:

Curcumin inhibited cyst formation in surviving trophozoites under both starvation and nutrient-rich conditions.
Autophagy inhibition (3-methyladenine) significantly reduced cyst formation.
Curcumin treatment led to basal mRNA expression of key autophagy-related genes (ATG3, ATG8b, ATG12, ATG16) and delayed increase in encystation-related genes.

Conclusions:

Curcumin inhibits A. triangularis cyst formation, potentially via its impact on autophagy-related gene expression.
Further research is needed to elucidate curcumin's mechanism in trophozoite arrest and its link to encystation pathways for therapeutic applications.