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Maiti B, Kumar K, Datta S, Bhattacharya S. Physical-Chemical Characterization of Bilayer Membranes Derived from (±) α-Tocopherol-Based Gemini Lipids and Their Interaction with Phosphatidylcholine Bilayers and Lipoplex Formation with Plasmid DNA. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:36-49. [PMID: 34955028 DOI: 10.1021/acs.langmuir.1c01039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Membrane formation and aggregation properties of two series of (±) α-tocopherol-based cationic gemini lipids without and with hydroxyl functionalities at the headgroup region (TnS n = 3, 4, 5, 6, 8, and 12; THnS n = 4, 5, 6, 8, and 12) with varying polymethylene spacer lengths were investigated extensively while comparing with the corresponding properties of the monomeric counterparts (TM and THM). Liposomal suspensions of each cationic lipid were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), zeta potential measurements, and small-angle X-ray diffraction studies. The length of the spacer and the presence of hydroxyl functionalities at the headgroup region strongly contribute to the aggregation behavior of these gemini lipids in water. The interaction of each tocopherol lipid with a model phospholipid, 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC)-derived vesicles, was thoroughly examined by differential scanning calorimetry (DSC) and 1,6-diphenyl-1,3,5-hexatriene (DPH)-doped fluorescence anisotropy measurements. The binding efficiency of the cationic tocopherol liposomes with plasmid DNA (pDNA) was followed by an ethidium bromide (EB) exclusion assay and zeta potential measurements, whereas negatively charged micellar sodium dodecyl sulfate (SDS)-mediated release of the pDNA from various preformed pDNA-liposomal complexes (lipoplex) was studied by an ethidium bromide (EB) reintercalation assay. The structural transformation of pDNA upon complexation with liposome was characterized using circular dichroism (CD) spectroscopic measurements. Gemini lipid-pDNA interactions depend on both the presence of hydroxyl functionalities at the headgroups and the length of the spacer chain between the headgroups. Succinctly, we performed a detailed physical-chemical characterization of the membranes formed from cationic monomeric and gemini lipids bearing tocopherol as their hydrophobic backbone and describe the role of inserting the -OH group at the headgroup of such lipids.
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Affiliation(s)
- Bappa Maiti
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
- Technical Research Centre, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Krishan Kumar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Subhasis Datta
- School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
- Technical Research Centre, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
- School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Coelho F, Salonen LM, Silva BFB. Hemiacetal-linked pH-sensitive PEG-lipids for non-viral gene delivery. NEW J CHEM 2022. [DOI: 10.1039/d2nj02217f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cationic lipid–DNA complexes containing a novel hemiacetal PEG-lipid for endosomal escape were characterized in terms of pH-response, stability, and biological activity.
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Affiliation(s)
- Filipe Coelho
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Laura M. Salonen
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Bruno F. B. Silva
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
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Maiti B, Kumar K, Moitra P, Kondaiah P, Bhattacharya S. Reduction Responsive Nanovesicles Derived from Novel α-Tocopheryl-Lipoic Acid Conjugates for Efficacious Drug Delivery to Sensitive and Drug Resistant Cancer Cells. Bioconjug Chem 2018; 29:255-266. [PMID: 29268009 DOI: 10.1021/acs.bioconjchem.7b00497] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Two novel α-tocopheryl-lipoic acid conjugates (TL1 and TL2) were synthesized for the anticancer drug, doxorubicin (DOX), delivery. Both conjugates were able to form stable nanovesicles. The critical aggregation concentration (CAC) was determined using 4-(N,N-dimethylamino)cinnamaldehyde (DMACA) as a fluorescence probe. Formation of highly packed nanovesicles was characterized by 1,6-diphenyl-1,3,5-hexatriene (DPH) fluorescence anisotropy and microviscosity measurements. The morphologies of nanovesicles were visualized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The response of nanovesicles to reducing environment of cells was probed by the addition of dithiothreitol (DTT), which was followed by the increase in the hydrodynamic diameter under dynamic light scattering (DLS) measurements. The encapsulation efficiency of a commonly used anticancer drug, doxorubicin (DOX), in nanovesicles was found to be ∼60% and ∼55% for TL1 and TL2, respectively (TL1-DOX and TL2-DOX). Also, the cumulative drug (DOX) release from DOX-encapsulated nanovesicles in response to biological reducing agent glutathione (GSH) was ∼50% and ∼40% for TL1-DOX and TL2-DOX, respectively, over a period of 10 h. Both TL1-DOX and TL2-DOX delivered the anticancer drug, doxorubicin (DOX), across the DOX-sensitive and DOX-resistant HeLa (HeLa-DOXR) cells in an efficient manner and significantly more efficaciously than the drug alone treatments, especially in HeLa-DOXR cells. The nanovesicle mediated DOX treatment also showed significantly higher cell death when compared to DOX alone treatment in HeLa-DOXR cells. Blood compatibility of the nanovesicles was supported from clotting time, hemolysis, and red blood cell (RBC) aggregation experiments for their potential in vivo applications. Concisely, we present biocompatible and responsive nanovesicles for efficacious drug delivery to drug-sensitive and drug-resistant cancer cells.
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Affiliation(s)
- Bappa Maiti
- Department of Organic Chemistry and ‡Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science , Bangalore 560012, India.,Director's Research Unit and ∥Technical Research Centre, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Krishan Kumar
- Department of Organic Chemistry and ‡Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science , Bangalore 560012, India.,Director's Research Unit and ∥Technical Research Centre, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Parikshit Moitra
- Department of Organic Chemistry and ‡Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science , Bangalore 560012, India.,Director's Research Unit and ∥Technical Research Centre, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Paturu Kondaiah
- Department of Organic Chemistry and ‡Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science , Bangalore 560012, India.,Director's Research Unit and ∥Technical Research Centre, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Santanu Bhattacharya
- Department of Organic Chemistry and ‡Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science , Bangalore 560012, India.,Director's Research Unit and ∥Technical Research Centre, Indian Association for the Cultivation of Science , Kolkata 700032, India
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Sreekanth V, Medatwal N, Pal S, Kumar S, Sengupta S, Bajaj A. Molecular Self-Assembly of Bile Acid-Phospholipids Controls the Delivery of Doxorubicin and Mice Survivability. Mol Pharm 2017; 14:2649-2659. [DOI: 10.1021/acs.molpharmaceut.7b00105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vedagopuram Sreekanth
- Laboratory
of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
- Manipal University, Manipal-576104, Karnataka, India
| | - Nihal Medatwal
- Laboratory
of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
- Manipal University, Manipal-576104, Karnataka, India
| | - Sanjay Pal
- Laboratory
of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
- KIIT University, Bhubaneswar-751024, Odisha, India
| | - Sandeep Kumar
- Laboratory
of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
- Manipal University, Manipal-576104, Karnataka, India
| | - Sagar Sengupta
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Avinash Bajaj
- Laboratory
of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
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Datta S, Bhattacharya S. Differential response of cholesterol based pyrimidine systems with oxyethylene type spacers to gelation and mesogen formation in the presence of alkali metal ions. SOFT MATTER 2015; 11:1945-1953. [PMID: 25619339 DOI: 10.1039/c4sm02792b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new series of lipophilic cholesteryl derivatives of 2,4,6-trichloro-pyrimidine-5-carbaldehyde has been synthesized. Oxyethylene spacers of variable lengths were inserted between the hydrogen bonding promoting pyrimidine core and the cholesteryl tail in order to understand their effect on the self-assembly of these compounds. Only compound 1a with the shortest spacer formed a gel in organic solvents such as n-butanol and n-dodecane. While other members (1b and c) having longer spacers led to sol formation and precipitation in n-butanol and n-dodecane respectively. The self-assembly phenomena associated with the gelation process were investigated using temperature-dependent UV-Vis and CD-spectroscopy. The morphological features of the freeze-dried gels obtained from different organic solvents were examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The solid phase behaviours of these molecules and their associated alkali metal ion complexes were explored using polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The molecular arrangements in the xerogel and in the solid state were further probed using a wide-angle X-ray diffraction (WAXD) technique. Analysis of the wide-angle X-ray diffraction data reveals that this class of molecules adopts a hexagonal columnar organization in the gel and in the solid state. Each slice of these hexagonal columnar structures is composed of a dimeric molecular-assembly as a building block. Significant changes in the conformation of the oxyethylene chains could be triggered via the coordination of selected alkali metal ions. This led to the production of interesting metal ion promoted mesogenic behaviour.
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Affiliation(s)
- Sougata Datta
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, Karnataka, India.
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Misra SK, Kus J, Kim S, Pan D. Nanoscopic poly-DNA-cleaver for breast cancer regression with induced oxidative damage. Mol Pharm 2014; 11:4218-27. [PMID: 25140389 DOI: 10.1021/mp500444c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A novel strategy for efficient "nanodelivery" of DNA-cleaving molecules for breast cancer regression is presented here. The synthetic methodology can be tweaked for controlled delivery and better bioavailability of effective doses of these DNA-cleaving agents through a defined self-assembled polymeric nanoarchitecture. In vitro studies in ER+ and ER- breast cancer human cell lines confirmed an efficient "nano"-delivery of DNA-cleaving molecules and indicated their capability to mediate oxidative damage to nucleobases and/or to the 2-deoxyribose moiety. Prepared E-poly-DNA-cleaver and C-poly-DNA-cleaver were found to be interacting with plasmid DNA pBR322 (pDNA) and active to cause oxidative cleavage of pDNA in the presence of ascorbic acid and H2O2. They were found to be significantly active as DNA cleaving agents in vitro and showed highly improved cancer regression in MCF-7 and MD-MB231 cancer cells compared to small molecule DNA cleaver. Surface conjugated nanoparticles were found to be more effective than noncovalent encapsulation and the small molecule agent, whereas in all the cases RCM was significantly inactive toward DNA cleavage. Blood contact complement activation properties were evaluated to gauge their likelihood to promote acute toxicity following systemic administration. The complement activation analyses together with the blood smear study confirm the feasibility of using these poly-DNA-cleavers without risk of induced immune response.
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Affiliation(s)
- Santosh K Misra
- Department of Bioengineering and ‡Beckman Institute of Advanced Science and Technology, University of Illinois Urbana-Champaign , Urbana, Illinois 61801, United States
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Misra SK, Biswas J, Kondaiah P, Bhattacharya S. Gene transfection in high serum levels: case studies with new cholesterol based cationic gemini lipids. PLoS One 2013; 8:e68305. [PMID: 23861884 PMCID: PMC3701654 DOI: 10.1371/journal.pone.0068305] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Accepted: 06/02/2013] [Indexed: 01/09/2023] Open
Abstract
Background Six new cationic gemini lipids based on cholesterol possessing different positional combinations of hydroxyethyl (-CH2CH2OH) and oligo-oxyethylene -(CH2CH2O)n- moieties were synthesized. For comparison the corresponding monomeric lipid was also prepared. Each new cationic lipid was found to form stable, clear suspensions in aqueous media. Methodology/Principal Findings To understand the nature of the individual lipid aggregates, we have studied the aggregation properties using transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta potential measurements and X-ray diffraction (XRD). We studied the lipid/DNA complex (lipoplex) formation and the release of the DNA from such lipoplexes using ethidium bromide. These gemini lipids in presence of a helper lipid, 1, 2-dioleoyl phophatidyl ethanol amine (DOPE) showed significant enhancements in the gene transfection compared to several commercially available transfection agents. Cholesterol based gemini having -CH2-CH2-OH groups at the head and one oxyethylene spacer was found to be the most effective lipid, which showed transfection activity even in presence of high serum levels (50%) greater than Effectene, one of the potent commercially available transfecting agents. Most of these geminis protected plasmid DNA remarkably against DNase I in serum, although the degree of stability was found to vary with their structural features. Conclusions/Significance -OH groups present on the cationic headgroups in combination with oxyethylene linkers on cholesterol based geminis, gave an optimized combination of new genera of gemini lipids possessing high transfection efficiency even in presence of very high percentage of serum. This property makes them preferential transfection reagents for possible in vivo studies.
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Affiliation(s)
- Santosh K. Misra
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, India
| | - Joydeep Biswas
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, India
| | - Paturu Kondaiah
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
| | - Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, India
- Chemical Biology Unit of JNCASR, Bangalore, India
- * E-mail:
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Misra SK, Moitra P, Chhikara BS, Kondaiah P, Bhattacharya S. Loading of single-walled carbon nanotubes in cationic cholesterol suspensions significantly improves gene transfection efficiency in serum. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15659h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bhattacharya S, Biswas J. Vesicle and stable monolayer formation from simple "click" chemistry adducts in water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1581-1591. [PMID: 21291251 DOI: 10.1021/la104851g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Click chemistry has been successfully extended into the field of molecular design of novel amphiphatic adducts. After their syntheses and characterizations, we have studied their aggregation properties in aqueous medium. Each of these adducts forms stable suspensions in water. These suspensions have been characterized by dynamic light scattering (DLS) studies and transmission electron microscopy (TEM). The presence of inner aqueous compartments in such aggregates has been demonstrated using dye (methylene blue) entrapment studies. These aggregates have been further characterized using X-ray diffraction (XRD), which indicates the existence of bilayer structures in them. Therefore, the resulting aggregates could be described as vesicles. The temperature-induced order-to-disorder transitions of the vesicular aggregates and the accompanying changes in their packing and hydration have been examined using high-sensitivity differential scanning calorimetry, fluorescence anisotropy, and generalized polarization measurements using appropriate membrane-soluble probe, 1,6-diphenylhexatriene, and Paldan, respectively. The findings of these studies are consistent with each other in terms of the apparent phase transition temperatures. Langmuir monolayer studies confirmed that these click adducts also form stable monolayers on buffered aqueous subphase at the air-water interface.
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Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India.
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Convulsant agent pentylenetetrazol does not alter the structural and dynamical properties of dipalmitoylphosphatidylcholine model membranes. J Pharm Biomed Anal 2011; 54:379-86. [DOI: 10.1016/j.jpba.2010.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 07/31/2010] [Accepted: 09/02/2010] [Indexed: 11/19/2022]
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Biswas J, Bajaj A, Bhattacharya S. Membranes of Cationic Gemini Lipids based on Cholesterol with Hydroxyl Headgroups and their Interactions with DNA and Phospholipid. J Phys Chem B 2010; 115:478-86. [DOI: 10.1021/jp108372z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joydeep Biswas
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India, Chemical Biology Unit of JNCASR, Bangalore 560 064, India, and J. C. Bose Fellow, DST, New Delhi, India
| | - Avinash Bajaj
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India, Chemical Biology Unit of JNCASR, Bangalore 560 064, India, and J. C. Bose Fellow, DST, New Delhi, India
| | - Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India, Chemical Biology Unit of JNCASR, Bangalore 560 064, India, and J. C. Bose Fellow, DST, New Delhi, India
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Bhattacharya S, Biswas J. Understanding membranes through the molecular design of lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4642-54. [PMID: 19842629 DOI: 10.1021/la9011718] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Lipids are amphiphilic molecules that are composed of hydrophilic and hydrophobic regions. A typical membranous aggregate (vesicles, water-filled lipid nanospheres) is formed upon the self-organization of lipids in water from a diverse collection of amphiphiles producing a dynamic supramolecular structure that shows phase behavior and ordering as required for specific biological functions. The determination of various physical properties of lipid aggregates is the key to determining structure-function relationships. Over the years, we have designed and synthesized a wide variety of lipid molecular systems for the investigation of their membrane-forming properties and have used them for purposes such as gene delivery and enzyme activation. In this feature article, we focus on our work on various types of lipids including ion-paired amphiphiles, cholesterol-based lipids, aromatic lipids, macrocyclic lipids containing disulfide tethers, cationic dimeric lipids, and so forth. The emphasis is on experimental design and bottom-line conclusions.
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Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India.
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Rodríguez A, Graciani MDM, Cordobés F, Moyá ML. Water−Ethylene Glycol Cationic Dimeric Micellar Solutions: Aggregation, Micellar Growth, and Characteristics As Reaction Media. J Phys Chem B 2009; 113:7767-79. [DOI: 10.1021/jp901457d] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Felipe Cordobés
- Departamento de Química Física and Departamento de Ingeniería Química, Universidad de Sevilla C/ Profesor García González 1, 41012 Sevilla, SPAIN
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Bhattacharya S, Bajaj A. Advances in gene delivery through molecular design of cationic lipids. Chem Commun (Camb) 2009:4632-56. [DOI: 10.1039/b900666b] [Citation(s) in RCA: 232] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Bajaj A, Kondaiah P, Bhattacharya S. Synthesis and Gene Transfection Efficacies of PEI−Cholesterol-Based Lipopolymers. Bioconjug Chem 2008; 19:1640-51. [DOI: 10.1021/bc700381v] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Avinash Bajaj
- Department of Organic Chemistry, and Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science, Bangalore 560 012, India, and Chemical Biology Unit of JNCASR, Bangalore 560 064, India
| | - Paturu Kondaiah
- Department of Organic Chemistry, and Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science, Bangalore 560 012, India, and Chemical Biology Unit of JNCASR, Bangalore 560 064, India
| | - Santanu Bhattacharya
- Department of Organic Chemistry, and Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science, Bangalore 560 012, India, and Chemical Biology Unit of JNCASR, Bangalore 560 064, India
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Bajaj A, Mishra SK, Kondaiah P, Bhattacharya S. Effect of the headgroup variation on the gene transfer properties of cholesterol based cationic lipids possessing ether linkage. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1222-36. [DOI: 10.1016/j.bbamem.2007.12.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2007] [Revised: 12/01/2007] [Accepted: 12/10/2007] [Indexed: 10/22/2022]
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Bhattacharya S, Bajaj A. Thermotropic and hydration studies of membranes formed from gemini pseudoglyceryl lipids possessing polymethylene spacers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:8988-94. [PMID: 17629306 DOI: 10.1021/la700654w] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Membrane formation from gemini pseudoglyceryl lipids bearing n-C14H29 and n-C16H33 chains has been reported. These lipid aggregates have been characterized using transmission electron microscopy (TEM), dynamic light scattering (DLS), high sensitivity differential scanning calorimetry (DSC), and Paldan fluorescence studies. The length of the spacer between the cationic ammonium headgroups has been varied from -(CH2)3- (propandiyl) to -(CH2)12- (dodecandiyl) in these lipids. All gemini lipids were found to generate stable suspensions in aqueous media. Electron microscopic studies revealed the smaller size of the gemini lipid aggregates as compared to their monomeric lipid counterparts. DLS measurements showed that the gemini lipid suspensions with a -(CH2)8- spacer length were bigger in size than that of other analogues. DSC studies suggest the unusual behavior of the gemini lipids bearing -(CH2)3- propanediyl spacer based lipids. These observations were consistent irrespective of the hydrocarbon chain lengths of the lipids. Paldan fluorescence based hydration studies showed that the hexadecyl chain based gemini lipid aggregates bearing a -(CH2)12- spacer were the most hydrated in their gel states among all the gemini lipid series investigated herein.
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Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
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Yin H, Lin Y, Huang J, Ye J. Temperature-induced vesicle aggregation in catanionic surfactant systems: the effects of the headgroup and counterion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:4225-30. [PMID: 17371059 DOI: 10.1021/la063221c] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The peculiar nature of temperature-induced vesicle aggregation (TIVA) in some catanionic surfactant systems is systematically investigated. On the basis of a general analysis of the intervesicular interactions, the main driving force for this phenomenon is considered to be the intervesicular hydrophobic interaction among the exposed hydrophobic part of the surfactant headgroups. The addition of an oppositely charged hydrophobic salt to the catanionic vesicle systems is also found to promote the occurrence of TIVA. In fact, TIVA can be induced in ordinary catanionic vesicle systems by the addition of an oppositely charged hydrophobic counterion.
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Affiliation(s)
- Haiqing Yin
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
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Paul B, Bajaj A, Indi S, Bhattacharya S. Synthesis of novel dimeric cationic lipids based on an aromatic backbone between the hydrocarbon chains and headgroup. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.09.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Roy S, Khatua D, Dey J. Giant vesicles of a single-tailed chiral cationic surfactant, (1R,2S)-(–)-N-dodecyl-N-methylephedrinium bromide, in water. J Colloid Interface Sci 2005; 292:255-64. [PMID: 16024030 DOI: 10.1016/j.jcis.2005.05.054] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2005] [Revised: 05/18/2005] [Accepted: 05/18/2005] [Indexed: 11/26/2022]
Abstract
Self-assembly properties of a single-tailed chiral cationic surfactant, (1R,2S)-(-)-N-dodecyl-N-methylephedrinium bromide (DMEB), have been studied in water. The molecular self-assemblies of the amphiphile have been characterized by surface tension, fluorescence probes, light scattering, and microscopic techniques. The results have been compared with those of dodecyltrimethylammonium bromide (DTAB) surfactant. The critical aggregation concentration of DMEB was found to be much less than that of DTAB. Surface tension and fluorescence probe studies have suggested formation of micellar structures at low temperature (<28 degrees C) and spontaneous formation of giant vesicles in water above 28 degrees C. The mean size of the aggregates has been measured by a dynamic light scattering method. The micropolarity and microviscosity of the self-assemblies were determined by fluorescence probe technique. The (1)H NMR and FTIR spectra were recorded to elucidate the role of the hydrophobic head group towards the formation of bilayer structures. The phase transition temperatures of the vesicular aggregates were determined by measurement of fluorescence anisotropy at various temperatures.
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Affiliation(s)
- Sumita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
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Bhattacharya S, Bajaj A. Recent advances in lipid molecular design. Curr Opin Chem Biol 2005; 9:647-55. [PMID: 16257570 DOI: 10.1016/j.cbpa.2005.10.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Accepted: 10/13/2005] [Indexed: 11/23/2022]
Abstract
The area of lipid molecular design is attracting widespread interest among numerous research groups worldwide. Diverse lipid assemblies in aqueous media, such as vesicles, bilayers and nanorods, offer new applications in chemical biology. Lipids with specifically tailored molecular architecture have been successfully employed as gene delivery vehicles, for controlled drug release and the preparation of supramolecular gels. Such molecular design of lipids, as well as their characterization upon membrane formation, offers an insight into the possible molecular basis of their properties. This in turn helps in the design of further generations of lipid systems with more predictable characteristics. Here, we present an overview of the current trends in lipid design and their utilization in various biochemical, physical and chemical applications.
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Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore - 560012, India.
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