Wang S, Shen Y, Zhang J, Xu S, Liu H. A designed lipopeptide with a leucine zipper as an imbedded on/off switch for lipid bilayers.
Phys Chem Chem Phys 2016;
18:10129-37. [PMID:
27009364 DOI:
10.1039/c6cp00378h]
[Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Thermo-sensitive drug carriers are receiving increasing attention for use with localized hyperthermia at abnormal tissue sites or to easily implement hyperthermia. In this study, a thermo-sensitive lipopeptide was designed, consisting of a carbon chain and a leucine zipper with an amino acid sequence CH3-(CH2)4-CO-NH-VAQLEVK-VAQLESK-VSKLESK-VSSLESK-COOH. They could form dimers by the hydrophobic force at body temperature and separate into single random coils above the melting temperature (Tm). The lipopeptide was mixed with phospholipids to form a hybrid liposome (Lipo-LPe). The Tm of the free lipopeptide and lipopeptide in Lipo-LPe was found to be 48.0 °C and 42.5 °C from circular dichroism data, respectively. Compared with the pure liposome, the phase-transition temperature (Ttr) of Lipo-LPe, which was obtained by differential scanning calorimetry, was increased by about 5 °C, showing an improvement of thermal stability. The drug release rate of Lipo-LPe was slightly decreased at body temperature but greatly increased at mild hyperthermia in vitro. Drug release under intermittent heating was performed, and the reversibility of thermo-sensitive on/off switch was confirmed. Furthermore, Lipo-LPe achieved the maximum amount of cell death under mild hyperthermia. We concluded that Lipo-LPe, as a novel thermo-sensitive drug carrier, provides a promising opportunity for controlling drug release.
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