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Evaluation of the effects in cellular membrane models of antitrypanosomal poly-thymolformaldehyde (PTF) using Langmuir monolayers

The polymerization of bioactive compounds may be interesting because the supramolecular structures formed can boost biological action on microorganism membranes. In the present work, poly-thymolformaldehyde (PTF) activity, prepared by condensation of thymol and formaldehyde, was evaluated against tr...

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Published in:Biochimica et biophysica acta. Biomembranes 2021-02, Vol.1863 (2), p.183500-183500, Article 183500
Main Authors: Parolin, Giovana A., Gonçalves, Giulia E.G., Costa-Silva, Thais A., Tempone, Andre G., Caseli, Luciano, Lago, João Henrique G., Péres, Laura O.
Format: Article
Language:English
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Summary:The polymerization of bioactive compounds may be interesting because the supramolecular structures formed can boost biological action on microorganism membranes. In the present work, poly-thymolformaldehyde (PTF) activity, prepared by condensation of thymol and formaldehyde, was evaluated against trypomastigote forms of Trypanosoma cruzi and related with the physicochemical changes provided by the incorporation of the compound in protozoan cell membrane models. PTF exhibited an EC50 value of 23.4 μg/mL and no toxicity against mammalian cells (CC50 > 200 μg/mL). To understand the molecular action of PTF as an antiprotozoal candidate, this compound was incorporated in Langmuir monolayers of dipalmitoylphosphatidylglycerol (DPPG) as a model for parasite cell membranes. PTF shifted DPPG surface pressure-area isotherms to higher areas, indicating its incorporation in the lipid films. Additionally, it changed the thermodynamic, compressional, structural, and morphological properties of the floating monolayers, decreasing the collapse pressure, reducing the surface elasticity, and segregating molecules at the interface, forming domains with different reflectivities. Infrared spectroscopy showed that the lipid films with PTF presented an increased rate of gauche/all-trans conformers for the methylene groups from the acyl chains, indicating molecular disorder. Therefore, these results show that PTF alters the physicochemical properties of DPPG monolayers as a model for protozoa cell membranes, which can enhance the comprehension of the parasitic action of PTF against T. cruzi. [Display omitted] •A based-thymol polymer was synthesized.•The antiparasitic potential of poly-thymolformaldehyde (PTF) was determined in vitro.•PTF altered the physicochemical properties of DPPG monolayers as a model for protozoa cell membranes.•PFT induced the formation of aggregates with possible induction of phase segregation.
ISSN:0005-2736
1879-2642
DOI:10.1016/j.bbamem.2020.183500