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Probing relaxation dynamics of a cationic lipid based non-viral carrier: a time-resolved fluorescence study

机译:基于阳离子脂质的非病毒载体的探测动态:时间分辨荧光研究

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Lipid vesicles composed of cationic dioctadecyldimethylammonium bromide (DODAB) and neutral 1-monooleoyl-rac-glycerol (MO) are promising non-viral carriers of nucleic acids for delivery into cells. Among them, higher cell transfection efficiency was displayed by DODAB-rich vesicles than those enriched with MO. Structural relaxation of these mixed lipid vesicles plays a key role in their cell transfection efficiency because structural organization of the DODAB-rich vesicles are different from that of the MO-rich vesicles. Polarization-gated anisotropy in conjunction with picosecond resolved emission transients of a novel fluorophore 6-acetyl-(2-((4-hydroxycyclohexyl)(methyl)amino)naphthalene) (ACYMAN) has been employed to probe relaxation dynamics in pure DODAB vesicles, and in mixed vesicles of DODAB with varying content of MO. Both orientational relaxation of ACYMAN and relaxation dynamics of its local environment are retarded significantly in mixed lipid vesicles with increasing MO content, from a mole fraction (chi(MO)) of 0.2 to that of 0.8 which is consistent with increased rigidity of the MO-rich (chi(MO) > 0.5) vesicles relative to the DODAB-rich (chi(MO) < 0.5) vesicles. Therefore, higher structural rigidity of the MO-rich vesicles (chi(MO) > 0.5) gives rise to their lower cell transfection efficiency than the more flexible DODAB-rich (chi(MO) < 0.5) vesicles as observed in previous in vivo studies (Biochim. Biophys. Acta, Biomembr., 2014, 1838, 2555-2567).
机译:由阳离子二辛二烯二氯铵(DoDAB)和中性1-单烯OY1-RAC-甘油(MO)组成的脂质囊泡是有前途的核酸的非病毒载体,用于递送到细胞中。其中,Dodab的囊泡呈现高细胞转染效率而不是富含MO的囊泡。这些混合脂质囊泡的结构松弛在其细胞转染效率中起着关键作用,因为富含Dodab的囊泡的结构组织与Mo的富含囊泡的结构组织不同。与微微秒的分离的发射瞬变结合新型荧光团6-乙酰基 - (2 - ((4-羟基环己基)(甲基)氨基)萘)(亚昔核人)结合偏振分离的各向异性已用于探测纯Dodab囊泡中的松弛动力学,在Dodab的混合囊泡中,具有不同含量的Mo。亚昔(局部环境的辐射动力学的取向松弛均在混合脂质囊泡中具有增加的Mo含量,从摩尔馏分(Chi(Mo))为0.2至0.8的摩尔馏分(Chi(Mo)),这与Mo的刚性增加一致富含(CHI(MO)> 0.5)囊泡相对于富含DODAB的(CHI(MO)<0.5)囊泡。因此,富含MO的囊泡的较高结构刚性(CHI(MO)> 0.5),其比在体内研究中之前观察到的更柔性的DoDab的富含(Chi(Mo)<0.5)囊泡的细胞转染效率。 (Biochim。Biophys。Acta,BioMembr。,2014,1838,2555-2567)。

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    《RSC Advances》 |2019年第61期|共10页
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  • 正文语种 eng
  • 中图分类 化学;
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