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In Vitro Antileishmanial and Cytotoxic Activities of Nerolidol Are Associated With Changes in Plasma Membrane Dynamics

In Vitro Antileishmanial and Cytotoxic Activities of Nerolidol Are Associated With Changes in Plasma Membrane Dynamics

Lais Alonso, Kelly Souza Fernandes, Sebastião Antônio Mendanha, Pablo José Gonçalves, Rodrigo Saar Gomes, Miriam Leandro Dorta, Antonio Alonso

Biochim Biophys Acta Biomembr. 2019 Jun 1;1861(6):1049-1056.

PMID: 30890467

Abstract:

The sesquiterpene nerolidol is a membrane-active compound that has demonstrated antitumor, antibacterial, antifungal and antiparasitic activities. In this study, we used electron paramagnetic resonance (EPR) spectroscopy and biophysical parameters determined via cell culture assays to study the mechanisms underlying the in vitro antileishmanial activity of nerolidol. The EPR spectra of a spin-labeled stearic acid indicated notable interactions of nerolidol with the cell membrane of Leishmania amazonensis amastigotes. The nerolidol IC50 values in L. amazonensis amastigotes and promastigotes were found to depend on the cell concentration used in the assay. This dependence was described by an equation that considers various cell suspension parameters, such as the 50% inhibitory concentrations of nerolidol in the cell membrane (cm50) and the aqueous phase (cw50) and the membrane-water partition coefficient of nerolidol (KM/W). Via cytotoxicity (CC50) and hemolytic potential (HC50) data, these parameters were also determined for nerolidol in macrophages and erythrocytes. With a cw50 of 125 μM, macrophages were less sensitive to nerolidol than amastigotes and promastigotes, which had mean cw50 values of 56 and 74 μM, respectively. The estimated cm50 values of nerolidol for amastigotes and promastigotes and macrophages were between 2.6 and 3.0 M, indicating substantial accumulation of nerolidol in the cell membrane. In addition, the spin-label EPR data indicated that membrane dynamic changes occurred in L. amazonensis amastigotes at concentrations similar to the nerolidol IC50 value.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7212444	Nerolidol		7212-44-4	Price

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