scholarly journals Niosomes based on synthetic cationic lipids for gene delivery: the influence of polar head-groups on the transfection efficiency in HEK-293, ARPE-19 and MSC-D1 cells

2015 ◽  
Vol 13 (4) ◽  
pp. 1068-1081 ◽  
Author(s):  
E. Ojeda ◽  
G. Puras ◽  
M. Agirre ◽  
J. Zárate ◽  
S. Grijalvo ◽  
...  
Keyword(s):  
Gene Delivery ◽  
Transfection Efficiency ◽  
Cationic Lipids ◽  
Head Group ◽  
Polar Head Group ◽  
Hek 293 ◽  
Polar Head ◽  
Head Groups

We designed niosomes based on three lipids that differed only in the polar-head group to analyze their influence on the transfection efficiency.

scholarly journals Biosynthesis of Ether-Type Polar Lipids in Archaea and Evolutionary Considerations

2007 ◽  
Vol 71 (1) ◽  
pp. 97-120 ◽  
Author(s):  
Yosuke Koga ◽  
Hiroyuki Morii
Keyword(s):  
Mevalonate Pathway ◽  
Polar Lipids ◽  
In Vivo Studies ◽  
Head Group ◽  
Polar Head Group ◽  
Phospholipid Synthesis ◽  
Polar Head ◽  
Head Groups

SUMMARY This review deals with the in vitro biosynthesis of the characteristics of polar lipids in archaea along with preceding in vivo studies. Isoprenoid chains are synthesized through the classical mevalonate pathway, as in eucarya, with minor modifications in some archaeal species. Most enzymes involved in the pathway have been identified enzymatically and/or genomically. Three of the relevant enzymes are found in enzyme families different from the known enzymes. The order of reactions in the phospholipid synthesis pathway (glycerophosphate backbone formation, linking of glycerophosphate with two radyl chains, activation by CDP, and attachment of common polar head groups) is analogous to that of bacteria. sn-Glycerol-1-phosphate dehydrogenase is responsible for the formation of the sn-glycerol-1-phosphate backbone of phospholipids in all archaea. After the formation of two ether bonds, CDP-archaeol acts as a common precursor of various archaeal phospholipid syntheses. Various phospholipid-synthesizing enzymes from archaea and bacteria belong to the same large CDP-alcohol phosphatidyltransferase family. In short, the first halves of the phospholipid synthesis pathways play a role in synthesis of the characteristic structures of archaeal and bacterial phospholipids, respectively. In the second halves of the pathways, the polar head group-attaching reactions and enzymes are homologous in both domains. These are regarded as revealing the hybrid nature of phospholipid biosynthesis. Precells proposed by Wächtershäuser are differentiated into archaea and bacteria by spontaneous segregation of enantiomeric phospholipid membranes (with sn-glycerol-1-phosphate and sn-glycerol-3-phosphate backbones) and the fusion and fission of precells. Considering the nature of the phospholipid synthesis pathways, we here propose that common phospholipid polar head groups were present in precells before the differentiation into archaea and bacteria.

scholarly journals Phosphonodithioester–Amine Coupling as a Key Reaction Step for the Design of Cationic Amphiphiles Used for Gene Delivery

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7507
Author(s):  
Montassar Khalil ◽  
Alexis Hocquigny ◽  
Mathieu Berchel ◽  
Tristan Montier ◽  
Paul-Alain Jaffrès
Keyword(s):  
Cell Lines ◽  
Head Group ◽  
Polar Head Group ◽  
Polar Head ◽  
Cationic Amphiphiles ◽  
Head Groups ◽  
New Synthesis ◽  
Lipid Moiety ◽  
Low Charge ◽  
Amine Coupling

A convergent synthesis of cationic amphiphilic compounds is reported here with the use of the phosphonodithioester–amine coupling (PAC) reaction. This versatile reaction occurs at room temperature without any catalyst, allowing binding of the lipid moiety to a polar head group. This strategy is illustrated with the use of two lipid units featuring either two oleyl chains or two-branched saturated lipid chains. The final cationic amphiphiles were evaluated as carriers for plasmid DNA delivery in four cell lines (A549, Calu3, CFBE and 16HBE) and were compared to standards (BSV36 and KLN47). These new amphiphilic derivatives, which were formulated with DOPE or DOPE-cholesterol as helper lipids, feature high transfection efficacies when associated with DOPE. The highest transfection efficacies were observed in the four cell lines at low charge ratios (CR = 0.7, 1 or 2). At these CRs, no toxic effects were detected. Altogether, this new synthesis scheme using the PAC reaction opens up new possibilities for investigating the effects of lipid or polar head groups on transfection efficacies.

scholarly journals Transgene expression in mice of the Opa1 mitochondrial transmembrane protein through bicontinuous cubic lipoplexes containing gemini imidazolium surfactants

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Mónica Muñoz-Úbeda ◽  
Martina Semenzato ◽  
Anais Franco-Romero ◽  
Elena Junquera ◽  
Emilio Aicart ◽  
...  
Keyword(s):  
Transgene Expression ◽  
Transmembrane Protein ◽  
Quantitative Polymerase Chain Reaction ◽  
Genetic Material ◽  
Cationic Lipids ◽  
Head Group ◽  
Polar Head ◽  
Cubic Phases ◽  
Head Groups ◽  
Bicontinuous Cubic

Abstract Background Lipoplexes are non-viral vectors based on cationic lipids used to deliver DNA into cells, also known as lipofection. The positively charge of the hydrophilic head-group provides the cationic lipids the ability to condensate the negatively charged DNA into structured complexes. The polar head can carry a large variety of chemical groups including amines as well as guanidino or imidazole groups. In particular, gemini cationic lipids consist of two positive polar heads linked by a spacer with different length. As for the hydrophobic aliphatic chains, they can be unsaturated or saturated and are connected to the polar head-groups. Many other chemical components can be included in the formulation of lipoplexes to improve their transfection efficiency, which often relies on their structural features. Varying these components can drastically change the arrangement of DNA molecules within the lamellar, hexagonal or cubic phases that are provided by the lipid matrix. Lipofection is widely used to deliver genetic material in cell culture experiments but the simpler formulations exhibit major drawbacks related to low transfection, low specificity, low circulation half-life and toxicity when scaled up to in vivo experiments. Results So far, we have explored in cell cultures the transfection ability of lipoplexes based on gemini cationic lipids that consist of two C16 alkyl chains and two imidazolium polar head-groups linked with a polyoxyethylene spacer, (C16Im)2(C4O). Here, PEGylated lipids have been introduced to the lipoplex formulation and the transgene expression of the Opa1 mitochondrial transmembrane protein in mice was assessed. The addition of PEG on the surface of the lipid mixed resulted in the formation of Ia3d bicontinuous cubic phases as determined by small angle X-ray scattering. After a single intramuscular administration, the cubic lipoplexes were accumulated in tissues with tight endothelial barriers such as brain, heart, and lungs for at least 48 h. The transgene expression of Opa1 in those organs was identified by western blotting or RNA expression analysis through quantitative polymerase chain reaction. Conclusions The expression reported here is sufficient in magnitude, duration and toxicity to consolidate the bicontinuous cubic structures formed by (C16Im)2(C4O)-based lipoplexes as valuable therapeutic agents in the field of gene delivery. Graphical Abstract

scholarly journals Interactions of gangliosides with phospholipids and glycosphingolipids in mixed monolayers

1978 ◽  
Vol 175 (3) ◽  
pp. 1113-1118 ◽  
Author(s):  
B Maggio ◽  
F A Cumar ◽  
R Caputto
Keyword(s):  
Surface Potential ◽  
High Surface ◽  
Head Group ◽  
Polar Head Group ◽  
Molecular Area ◽  
Mixed Monolayers ◽  
Polar Head ◽  
Head Groups ◽  
Electrostatic Repulsions ◽  
The Ideal

1. The interactions among five different gangliosides and three chemically related glycosphingolipids and their behaviour in mixed monolayers with six different phospholipids were investigated at the air/145 mM-NaCl interface at pH 5.6. 2. The mixed monolayers of any of the different gangliosides showed an immiscible behaviour at high surface pressures, with absence of interactions among them revealed by an ideal behaviour for mean molecular area and surface potential per molecule. 3. This behaviour was probably the consequence of steric hindrance and electrostatic repulsions between their polar head groups. 4. Di- and tri-sialogangliosides could be differentiated from neutral sphingolipids and monosialogangliosides on the basis of their interactions with phospholipids, which were correlated to the perpendicular electric field at the interface contributed by the carbohydrate residues. 5. The presence of the phosphocholine polar head group in phosphatidylcholine was important to establish interactions with di- and tri-sialogangliosides revealed by negative deviations from the ideal behaviour for mean molecular areas and mean surface potential per molecule. 6. The possible significance of these observations is discussed in relation to the participation of gangliosides in the organization of membranes and to their capability of inducing membrane fusion.

Stepwise Development of Biomimetic Chimeric Peptides for Gene Delivery

2020 ◽  
Vol 27 (8) ◽  
pp. 698-710
Author(s):  
Roya Cheraghi ◽  
Mahboobeh Nazari ◽  
Mohsen Alipour ◽  
Saman Hosseinkhani
Keyword(s):  
Gene Delivery ◽  
Targeted Delivery ◽  
Viral Vectors ◽  
Large Scale ◽  
Transfection Efficiency ◽  
Cationic Lipids ◽  
Target Cells ◽  
Scale Production ◽  
Stepwise Development ◽  
Chimeric Peptides

Gene-based therapy largely relies on the vector type that allows a selective and efficient transfection into the target cells with maximum efficacy and minimal toxicity. Although, genes delivered utilizing modified viruses transfect efficiently and precisely, these vectors can cause severe immunological responses and are potentially carcinogenic. A promising method of overcoming this limitation is the use of non-viral vectors, including cationic lipids, polymers, dendrimers, and peptides, which offer potential routes for compacting DNA for targeted delivery. Although non-viral vectors exhibit reduced transfection efficiency compared to their viral counterpart, their superior biocompatibility, non-immunogenicity and potential for large-scale production make them increasingly attractive for modern therapy. There has been a great deal of interest in the development of biomimetic chimeric peptides. Biomimetic chimeric peptides contain different motifs for gene translocation into the nucleus of the desired cells. They have motifs for gene targeting into the desired cell, condense DNA into nanosize particles, translocate the gene into the nucleus and enhance the release of the particle into the cytoplasm. These carriers were developed in recent years. This review highlights the stepwise development of the biomimetic chimeric peptides currently being used in gene delivery.

The effect of polar head group of dodecyl surfactants on the growth of wheat and cucumber

Chemosphere ◽  
2020 ◽  
Vol 254 ◽  
pp. 126918
Author(s):  
Aleksandar Tot ◽  
Ivana Maksimović ◽  
Marina Putnik-Delić ◽  
Milena Daničić ◽  
Slobodan Gadžurić ◽  
...  
Keyword(s):  
Head Group ◽  
Polar Head Group ◽  
Polar Head
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