Cellular Effects of Cyclodextrins: Studies on HeLa Cells

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Cyclodextrins are oligosaccharides used as pharmaceutical excipients to enhance solubility and permeability.
• Beta-cyclodextrins also function as cholesterol sequestering agents in life sciences.
• Previous studies showed cyclodextrin internalization and effects in Caco-2 cells.

Purpose of the Study:

• To investigate the endocytosis of (2-hydroxylpropyl)-beta-(HPBCD) and random methylated-beta-cyclodextrin (RAMEB) in HeLa cells.
• To assess the cytotoxicity, NF-kappa B pathway induction, autophagy, and lysosome formation induced by these cyclodextrin derivatives.
• To compare the cellular uptake and effects in HeLa cells with previous findings in Caco-2 cells.

Main Methods:

• Cellular uptake studies of HPBCD and RAMEB in HeLa cells.
• Cytotoxicity assays.
• Analysis of NF-kappa B p65 translocation to the nucleus.
• Assessment of autophagosome formation (autophagy).
• Investigation of lysosomal localization of internalized cyclodextrins.

Main Results:

• HPBCD and RAMEB were successfully internalized by HeLa cells.
• Endocytosis inhibition patterns differed between HeLa and Caco-2 cells.
• No significant NF-kappa B p65 translocation was observed after pre-treatment or treatment.
• Cyclodextrin treatment did not enhance autophagosome formation.
• Internalized cyclodextrin derivatives were partially localized within lysosomes.

Conclusions:

• HPBCD and RAMEB exhibit distinct endocytic pathways and intracellular effects in HeLa cells compared to Caco-2 cells.
• These cyclodextrin derivatives do not activate the NF-kappa B pathway or induce autophagy in HeLa cells.
• The partial lysosomal localization suggests a specific cellular trafficking route for these compounds in HeLa cells.