scholarly journals DNA conformational changes induced by cationic gemini surfactants: the key to switching DNA compact structures into elongated forms

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29433-29446 ◽  
Author(s):  
Elia Grueso ◽  
Edyta Kuliszewska ◽  
Emilio Roldan ◽  
Pilar Perez-Tejeda ◽  
Rafael Prado-Gotor ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Gemini Surfactants ◽  
Tail Length ◽  
Cationic Gemini Surfactants ◽  
Dna Conformational Changes

The extent of DNA decompaction induced by m-s-m gemini surfactants depend on the surfactant's tail length and on spacer's length.

scholarly journals Development of Lyophilized Gemini Surfactant-Based Gene Delivery Systems: Influence of Lyophilization on the Structure, Activity and Stability of the Lipoplexes

2012 ◽  
Vol 15 (4) ◽  
pp. 548 ◽  
Author(s):  
Waleed Mohammed-Saeid ◽  
Deborah Michel ◽  
Anas El-Aneed ◽  
Ronald E Verrall ◽  
Nicholas H Low ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Transfection Efficiency ◽  
Gene Transfection ◽  
Physiochemical Properties ◽  
Cationic Gemini Surfactants ◽  
The Stability ◽  
In Vitro Transfection

Purpose. Cationic gemini surfactants have been studied as non-viral vectors for gene therapy. Clinical applications of cationic lipid/DNA lipoplexes are restricted by their instability in aqueous formulations. In this work, we investigated the influence of lyophilization on the essential physiochemical properties and in vitro transfection of gemini surfactant-lipoplexes. Additionally, we evaluated the feasibility of lyophilization as a technique for preparing lipoplexes with long term stability. Methods. A gemini surfactant [12-7NH-12] and plasmid DNA encoding for interferon-γ were used to prepare gemini surfactant/pDNA [P/G] lipoplexes. Helper lipid DOPE [L] was incorporated in all formulation producing a [P/G/L] system. Sucrose and trehalose were utilized as stabilizing agents. To evaluate the ability of lyophilization to improve the stability of gemini surfactant-based lipoplexes, four lyophilized formulations were stored at 25˚C for three months. The formulations were analyzed at different time-points for physiochemical properties and in vitro transfection. Results. The results showed that both sucrose and trehalose provided anticipated stabilizing effect. The transfection efficiency of the lipoplexes increased 2-3 fold compared to fresh formulations upon lyophilization. This effect can be attributed to the improvement of DNA compaction and changes in the lipoplex morphology due to the lyophilization/rehydration cycles. The physiochemical properties of the lyophilized formulations were maintained throughout the stability study. All lyophilized formulations showed a significant loss of gene transfection activity after three months of storage. Nevertheless, no significant losses of transfection efficiency were observed for three formulations after two months storage at 25 ˚C. Conclusion. Lyophilization significantly improved the physical stability of gemini surfactant-based lipoplexes compared to liquid formulations. As well, lyophilization improved the transfection efficiency of the lipoplexes. The loss of transfection activity upon storage is most probably due to the conformational changes in the supramolecular structure of the lipoplexes as a function of time and temperature rather than to DNA degradation. This article is open to POST-PUBLICATION REVIEW. Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

Mixing Behavior of Anionic Hydrotropes with Cationic Gemini Surfactants

2010 ◽  
Vol 55 (11) ◽  
pp. 4775-4779 ◽  
Author(s):  
Iqrar Ahmad Khan ◽  
Ahmad Jahan Khanam ◽  
Ziya Ahmad Khan ◽  
Kabir-ud-Din
Keyword(s):  
Gemini Surfactants ◽  
Cationic Gemini Surfactants ◽  
Mixing Behavior

Surface Tension and Aggregation Properties of Novel Cationic Gemini Surfactants with Diethylammonium Headgroups and a Diamido Spacer

Langmuir ◽  
2012 ◽  
Vol 28 (33) ◽  
pp. 11979-11987 ◽  
Author(s):  
Qi Zhang ◽  
Zhinong Gao ◽  
Feng Xu ◽  
Shuxin Tai ◽  
Xueguo Liu ◽  
...  
Keyword(s):  
Surface Tension ◽  
Gemini Surfactants ◽  
Cationic Gemini Surfactants

Morphological Changes of Cationic Gemini Surfactants 14-s-14 (s=4,5,6) in the Presence of Additives

2012 ◽  
Vol 41 (7) ◽  
pp. 1133-1143 ◽  
Author(s):  
Umme S. Siddiqui ◽  
Farah Khan ◽  
Iqrar A. Khan ◽  
Kabir-ud-Din
Keyword(s):  
Gemini Surfactants ◽  
Morphological Changes ◽  
Cationic Gemini Surfactants

Interactions of Cationic Gemini Surfactants with Hydrophobically Modified Poly(acrylamides) Studied by Fluorescence and Microcalorimetry

2005 ◽  
Vol 109 (26) ◽  
pp. 12850-12855 ◽  
Author(s):  
Xiaoyong Wang ◽  
Yajuan Li ◽  
Jinben Wang ◽  
Yilin Wang ◽  
Jianping Ye ◽  
...  
Keyword(s):  
Gemini Surfactants ◽  
Hydrophobically Modified ◽  
Cationic Gemini Surfactants
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