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Effect of organotin compounds on membrane lipids: Fluorescence spectroscopy studies

✍ Scribed by Annarina Ambrosini; Enrico Bertoli; Giovanna Zolese

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
496 KB
Volume
10
Category
Article
ISSN
0268-2605

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✦ Synopsis

The temperature dependence of 1,6-diphenyl-1,3,5-hexatriene (DPH) and 1-(44rimethylaminophenyl)d-phenyl-l,3,5-hexatriene (TMA-DPH) fluorescence anisotropy has been studied to investigate the influence of mono-n-butyltin chloride (MBTC), di-n-butyltin chloride (DBTC) and tri-n-phenyl chloride (TPTC) on the physicoche-mica1 state of dipalmitoyl phosphatidylcholine. Below the lipid chain melting transition (T,,,), fluorescence anisotropy values of DPH and TMA-DPH are increased by the presence of the organotins, without important modifications of the phase transition temperature. A possible difference in localization of the organotin compounds is suggested by the differential effect of the probes. It is suggested that there is localization in the hydrophobic core of the bilayer for TPTC, and at the head-group level for DBTC, and a homogeneous distribution in the bilayer for MBTC. Similar studies have been performed in liposomal suspensions of cardiolipin, phosphatidylserine and egg phosphatidylcholine.

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