1
|
He J, Pang W, Gu B, Lin X, Ye J. The stiffness-dependent tumor cell internalization of liquid metal nanoparticles. NANOSCALE 2022; 14:16902-16917. [PMID: 36342434 DOI: 10.1039/d2nr04293b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The properties of nanoparticle (NP) carriers, such as size, shape and surface state, have been proven to dramatically affect their uptake by tumor cells, thereby influencing and determining the effect of nanomedicine on tumor theranostics. However, the effect of the stiffness of NPs on their cellular internalization remains unclear, especially for circumstances involving active or passive NP targeting. In this work, we constructed eutectic gallium indium liquid metal NPs with the same particle size, shape and surface charge properties but distinct stiffness via tailoring the surface oxidation and silica coating. It has been found that the softer NPs would be endocytosed much slower than their stiffer counterparts in the presence of specific ligand-receptor interaction. Interestingly, once the interaction is eliminated, softer NPs are internalized faster than the stiffer ones. Based on experimental observations and theoretical verification, we demonstrate that this phenomenon is mainly caused by varying degrees of deformation of soft NPs induced by ligand-receptor interactions. Such a finding of the stiffness effect of NPs implies great potential for fundamental biomedical applications, such as the rational design of nanomedicines.
Collapse
Affiliation(s)
- Jing He
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
| | - Wen Pang
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
| | - Bobo Gu
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
| | - Xubo Lin
- Institute of Single Cell Engineering, Key Laboratory of Ministry of Education for Biomechanics and Mechanobiology, Beijing Advanced Innovation Center for Biomedical Engineering, School of Engineering Medicine, Beihang University, Beijing 100191, P. R. China
| | - Jian Ye
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
- Institute of Medical Robotics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
- Shanghai Key Laboratory of Gynecologic Oncology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P. R. China
| |
Collapse
|
2
|
Kalyanram P, Puri A, Gupta A. Thermotropic effects of PEGylated lipids on the stability of HPPH-encapsulated lipid nanoparticles (LNP). JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2021; 147:6337-6348. [PMID: 34220293 PMCID: PMC8235917 DOI: 10.1007/s10973-021-10929-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 05/30/2021] [Indexed: 06/13/2023]
Abstract
In this work, we demonstrate the enhanced thermal and steric stability of lipid-based formulations in the presence of encapsulated HPPH that have demonstrated potential cancer applications in previously presented in vivo studies. Differential scanning calorimeter (DSC) was used to study the phase transitions, and domain formations, and to qualify the thermodynamic properties associated with change in lipid bilayer behavior due to the presence of PEGylated at varying concentrations and sizes, and the encapsulated HPPH molecules. Thermal instability was quantified by dramatic changes in calculated enthalpy, and the shape of the melting peak or calculated half width of melting peak. This systematic study focused on understanding the effects of varying molecular mass and concentrations of PEG polymers in the photopolymerizable lipid DC8, 9PC lipid bilayer matrix for four weeks at room temperature of 25 °C. The major findings include increased thermal stability of the lipid bilayer due to the presence of PEG-2 K and the HPPH that resulted from the van der Waals forces between various molecular species, and the change in bilayer curvature confirmed via mathematical correlations. It is demonstrated that the encapsulation of therapeutics in lipid formulations can alter their overall thermal behavior, and therefore, it is imperative to consider calorimetric effects while designing lipid-based vaccines. The presented research methodologies and findings presented can predict the stability of lipid-based vaccines that are under development such as COVID-19 during their storage, transport, and distribution.
Collapse
Affiliation(s)
- Poornima Kalyanram
- Department of Mechanical, Industrial and Manufacturing Engineering, University of Toledo, Toledo, OH 43606 USA
| | - Anu Puri
- RNA Biology Laboratory, National Cancer Institute At Frederick, Frederick, MD 21702 USA
| | - Anju Gupta
- Department of Mechanical, Industrial and Manufacturing Engineering, University of Toledo, Toledo, OH 43606 USA
| |
Collapse
|
3
|
Massiot J, Rosilio V, Makky A. Photo-triggerable liposomal drug delivery systems: from simple porphyrin insertion in the lipid bilayer towards supramolecular assemblies of lipid–porphyrin conjugates. J Mater Chem B 2019; 7:1805-1823. [DOI: 10.1039/c9tb00015a] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Light-responsive liposomes are considered nowadays as one of the most promising nanoparticulate systems for the delivery and release of an active pharmaceutical ingredient (API) in a spatio-temporal manner.
Collapse
Affiliation(s)
- Julien Massiot
- Institut Galien Paris Sud
- Univ Paris-Sud
- CNRS
- Université Paris-Saclay
- 92296 Châtenay-Malabry
| | - Véronique Rosilio
- Institut Galien Paris Sud
- Univ Paris-Sud
- CNRS
- Université Paris-Saclay
- 92296 Châtenay-Malabry
| | - Ali Makky
- Institut Galien Paris Sud
- Univ Paris-Sud
- CNRS
- Université Paris-Saclay
- 92296 Châtenay-Malabry
| |
Collapse
|
4
|
Viard M, Reichard H, Shapiro BA, Durrani FA, Marko AJ, Watson RM, Pandey RK, Puri A. Design and biological activity of novel stealth polymeric lipid nanoparticles for enhanced delivery of hydrophobic photodynamic therapy drugs. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2018; 14:2295-2305. [PMID: 30059754 PMCID: PMC8034484 DOI: 10.1016/j.nano.2018.07.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 06/28/2018] [Accepted: 07/09/2018] [Indexed: 10/28/2022]
Abstract
Advances in in vivo stability and preferential tumor uptake of cancer nanomedicine are warranted for effective chemotherapy. Here, we describe a novel nanoformulation using an unconventional polymeric tubule-forming phospholipid, DC8,9PC. We report that DC8,9PC transitions to stable vesicles (LNPs) in the presence of PEGylated lipid (DSPE-PEG2000); the resulting DC8,9PC:DSPE-PEG2000 LNPs efficiently included a hydrophobic PDT drug, HPPH. Remarkably, these LNPs incorporated unusually high DSPE-PEG2000 concentrations; LNP10-HPPH and LNP20-HPPH (10 & 20 mol% PEGylated lipid, respectively) exhibited >90% serum stability at 37 °C. Increased PEGylation in the LNPs correlated with enhanced tumor accumulation in intravenously injected HT29 tumor mouse xenographs. Colon-26 bearing BALB/c mice, intravenously injected with LNP20-HPPH showed superior PDT efficacy and animal survival (no tumor recurrence up to 100 days) as compared to a formulation currently used in clinical trials. Taken together, we present a simple stealth binary lipid nanosystem with enhanced efficiency of tumor accumulation and superior therapeutic efficacy.
Collapse
Affiliation(s)
- Mathias Viard
- RNA Structure and Design Section, RNA Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, U.S.A.; Leidos Biomedical Research Inc., Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, U.S.A
| | - Henry Reichard
- RNA Structure and Design Section, RNA Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, U.S.A
| | - Bruce A Shapiro
- RNA Structure and Design Section, RNA Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, U.S.A
| | - Farukh A Durrani
- Photodynamic Therapy Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY, U.S.A
| | - Aimee J Marko
- Photodynamic Therapy Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY, U.S.A
| | - R Michelle Watson
- Photodynamic Therapy Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY, U.S.A
| | - Ravindra K Pandey
- Photodynamic Therapy Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY, U.S.A..
| | - Anu Puri
- RNA Structure and Design Section, RNA Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, U.S.A..
| |
Collapse
|
5
|
Nyrkova IA, Semenov AN. The concept of strongly interacting groups in self-assembly of soft matter. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2018; 41:103. [PMID: 30194515 DOI: 10.1140/epje/i2018-11699-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 07/10/2018] [Indexed: 06/08/2023]
Abstract
Amphiphilic molecules in solution typically produce structures coming from cooperative interactions of many synergetically acting functional units. If all essential interactions are weak, the structure can be treated theoretically based on a free energy expansion for small interaction parameters. However, most self-assembling soft matter systems involve strong specific interactions of functional units leading to qualitatively new structures of highly soluble micellar or fibrillar aggregates. Here we focus on the systems with the so-called strongly interacting groups (SIGs) incorporated into unimer molecules and discuss the effects of packing frustrations and unimer chirality as well as the origins of spontaneous morphological chirality in the case of achiral unimers. We describe several theoretical approaches (overcoming the limitations of weak interaction models) including the concepts of super-strong segregation, geometrical mismatch and orientational frustration. We also review some recently developed phenomenological theories of surfactant membranes and multiscale hierarchical approaches based on all-atomic modeling of packing structures of amphiphilic molecules with SIGs. In particular, we discuss self-assembling structures in systems possessing simultaneously several distinct types of SIGs: solutions of beta-sheet oligopeptides (showing different fibrillar morphologies), aromatic diamide-ester molecules (forming membranes, helical ribbons and tubules), and triarylamine amide derivatives (producing light-controlled supramolecular nanowires).
Collapse
Affiliation(s)
- I A Nyrkova
- Institut Charles Sadron, CNRS - UPR 22, Université de Strasbourg, 23 rue du Loess, BP 84047, 67034, Strasbourg Cedex 2, France
| | - A N Semenov
- Institut Charles Sadron, CNRS - UPR 22, Université de Strasbourg, 23 rue du Loess, BP 84047, 67034, Strasbourg Cedex 2, France.
| |
Collapse
|
6
|
Chechetka SA, Yu Y, Zhen X, Pramanik M, Pu K, Miyako E. Light-driven liquid metal nanotransformers for biomedical theranostics. Nat Commun 2017; 8:15432. [PMID: 28561016 PMCID: PMC5460022 DOI: 10.1038/ncomms15432] [Citation(s) in RCA: 191] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 03/29/2017] [Indexed: 02/07/2023] Open
Abstract
Room temperature liquid metals (LMs) represent a class of emerging multifunctional
materials with attractive novel properties. Here, we show that photopolymerized LMs
present a unique nanoscale capsule structure characterized by high water
dispersibility and low toxicity. We also demonstrate that the LM nanocapsule
generates heat and reactive oxygen species under biologically neutral near-infrared
(NIR) laser irradiation. Concomitantly, NIR laser exposure induces a transformation
in LM shape, destruction of the nanocapsules, contactless controlled release of the
loaded drugs, optical manipulations of a microfluidic blood vessel model and
spatiotemporal targeted marking for X-ray-enhanced imaging in biological organs and
a living mouse. By exploiting the physicochemical properties of LMs, we achieve
effective cancer cell elimination and control of intercellular calcium ion flux. In
addition, LMs display a photoacoustic effect in living animals during NIR laser
treatment, making this system a powerful tool for bioimaging. Liquid metals are excellent candidate materials for biomedicine, owing to their
intriguing optical properties and chemical stability. Here, the authors design
multifunctional theranostic liquid metal nanocapsules that, upon irradiation, generate
heat and reactive oxygen species and change shape to release drugs.
Collapse
Affiliation(s)
- Svetlana A Chechetka
- Department of Materials and Chemistry, Nanomaterials Research Institute (NMRI), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yue Yu
- Department of Materials and Chemistry, Nanomaterials Research Institute (NMRI), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Xu Zhen
- School of Chemical and Biomedical Engineering, Nanyang Technological University (NTU), Singapore 637457, Singapore
| | - Manojit Pramanik
- School of Chemical and Biomedical Engineering, Nanyang Technological University (NTU), Singapore 637457, Singapore
| | - Kanyi Pu
- School of Chemical and Biomedical Engineering, Nanyang Technological University (NTU), Singapore 637457, Singapore
| | - Eijiro Miyako
- Department of Materials and Chemistry, Nanomaterials Research Institute (NMRI), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| |
Collapse
|
7
|
Wilems TS, Sakiyama-Elbert SE. Sustained dual drug delivery of anti-inhibitory molecules for treatment of spinal cord injury. J Control Release 2015; 213:103-111. [PMID: 26122130 PMCID: PMC4691576 DOI: 10.1016/j.jconrel.2015.06.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 06/05/2015] [Accepted: 06/23/2015] [Indexed: 11/25/2022]
Abstract
Myelin-associated inhibitors (MAIs) and chondroitin sulfate proteoglycans (CSPGs) are major contributors to axon growth inhibition following spinal cord injury and limit functional recovery. The NEP1-40 peptide competitively binds the Nogo receptor and partially blocks inhibition from MAIs, while chondroitinase ABC (ChABC) enzymatically digests CSPGs, which are upregulated at the site of injury. In vitro studies showed that the combination of ChABC and NEP1-40 increased neurite extension compared to either treatment alone when dissociated embryonic dorsal root ganglia were seeded onto inhibitory substrates containing both MAIs and CSPGs. Furthermore, the ability to provide sustained delivery of biologically active ChABC and NEP1-40 from biomaterial scaffolds was achieved by loading ChABC into lipid microtubes and NEP1-40 into poly (lactic-co-glycolic acid) (PLGA) microspheres, obviating the need for invasive intrathecal pumps or catheters. Fibrin scaffolds embedded with the drug delivery systems (PLGA microspheres and lipid microtubes) were capable of releasing active ChABC for up to one week and active NEP1-40 for over two weeks in vitro. In addition, the loaded drug delivery systems in fibrin scaffolds decreased CSPG deposition and development of a glial scar, while also increasing axon growth after spinal cord injury in vivo. Therefore, the sustained, local delivery of ChABC and NEP1-40 within the injured spinal cord may block both myelin and CSPG-associated inhibition and allow for improved axon growth.
Collapse
Affiliation(s)
- Thomas S Wilems
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, United States
| | - Shelly E Sakiyama-Elbert
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, United States.
| |
Collapse
|
8
|
Shin SHR, Lee HY, Bishop KJM. Amphiphilic Nanoparticles Control the Growth and Stability of Lipid Bilayers with Open Edges. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201504362] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
9
|
Shin SHR, Lee HY, Bishop KJM. Amphiphilic Nanoparticles Control the Growth and Stability of Lipid Bilayers with Open Edges. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504362] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
10
|
Sine J, Urban C, Thayer D, Charron H, Valim N, Tata DB, Schiff R, Blumenthal R, Joshi A, Puri A. Photo activation of HPPH encapsulated in "Pocket" liposomes triggers multiple drug release and tumor cell killing in mouse breast cancer xenografts. Int J Nanomedicine 2014; 10:125-45. [PMID: 25565809 PMCID: PMC4278788 DOI: 10.2147/ijn.s72143] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We recently reported laser-triggered release of photosensitive compounds from liposomes containing dipalmitoylphosphatidylcholine (DPPC) and 1,2 bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC(8,9)PC). We hypothesized that the permeation of photoactivated compounds occurs through domains of enhanced fluidity in the liposome membrane and have thus called them "Pocket" liposomes. In this study we have encapsulated the red light activatable anticancer photodynamic therapy drug 2-(1-Hexyloxyethyl)-2-devinyl pyropheophorbide-a (HPPH) (Ex/Em410/670 nm) together with calcein (Ex/Em490/517 nm) as a marker for drug release in Pocket liposomes. A mole ratio of 7.6:1 lipid:HPPH was found to be optimal, with >80% of HPPH being included in the liposomes. Exposure of liposomes with a cw-diode 660 nm laser (90 mW, 0-5 minutes) resulted in calcein release only when HPPH was included in the liposomes. Further analysis of the quenching ratios of liposome-entrapped calcein in the laser treated samples indicated that the laser-triggered release occurred via the graded mechanism. In vitro studies with MDA-MB-231-LM2 breast cancer cell line showed significant cell killing upon treatment of cell-liposome suspensions with the laser. To assess in vivo efficacy, we implanted MDA-MB-231-LM2 cells containing the luciferase gene along the mammary fat pads on the ribcage of mice. For biodistribution experiments, trace amounts of a near infrared lipid probe DiR (Ex/Em745/840 nm) were included in the liposomes. Liposomes were injected intravenously and laser treatments (90 mW, 0.9 cm diameter, for an exposure duration ranging from 5-8 minutes) were done 4 hours postinjection (only one tumor per mouse was treated, keeping the second flank tumor as control). Calcein release occurred as indicated by an increase in calcein fluorescence from laser treated tumors only. The animals were observed for up to 15 days postinjection and tumor volume and luciferase expression was measured. A significant decrease in luciferase expression and reduction in tumor volume was observed only in laser treated animal groups injected with liposomes containing HPPH. Histopathological examination of tumor tissues indicated tumor necrosis resulting from laser treatment of the HPPH-encapsulated liposomes that were taken up into the tumor area.
Collapse
Affiliation(s)
- Jessica Sine
- Membrane Structure and Function Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute - Frederick, Frederick, MD, USA
| | - Cordula Urban
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA
| | - Derek Thayer
- Membrane Structure and Function Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute - Frederick, Frederick, MD, USA
| | - Heather Charron
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA
| | - Niksa Valim
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA
| | - Darrell B Tata
- US Food and Drug Administration, CDRH/OSEL/Division of Physics, White Oak Campus, MD, USA
| | - Rachel Schiff
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - Robert Blumenthal
- Membrane Structure and Function Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute - Frederick, Frederick, MD, USA
| | - Amit Joshi
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA
| | - Anu Puri
- Membrane Structure and Function Section, Basic Research Laboratory, Center for Cancer Research, National Cancer Institute - Frederick, Frederick, MD, USA
| |
Collapse
|
11
|
Barclay TG, Constantopoulos K, Matisons J. Nanotubes Self-Assembled from Amphiphilic Molecules via Helical Intermediates. Chem Rev 2014; 114:10217-91. [DOI: 10.1021/cr400085m] [Citation(s) in RCA: 185] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Thomas G. Barclay
- Flinders Centre for Nanoscale Science & Technology, School of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5042, Australia
| | - Kristina Constantopoulos
- Flinders Centre for Nanoscale Science & Technology, School of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5042, Australia
| | - Janis Matisons
- Flinders Centre for Nanoscale Science & Technology, School of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5042, Australia
| |
Collapse
|
12
|
Yavlovich A, Viard M, Gupta K, Sine J, Vu M, Blumenthal R, Tata DB, Puri A. Low-visibility light-intensity laser-triggered release of entrapped calcein from 1,2-bis (tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine liposomes is mediated through a type I photoactivation pathway. Int J Nanomedicine 2013; 8:2575-87. [PMID: 23901274 PMCID: PMC3726434 DOI: 10.2147/ijn.s44993] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We recently reported on the physical characteristics of photo-triggerable liposomes containing dipalmitoylphosphatidylcholine (DPPC), and 1,2-bis (tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC(8,9)PC) carrying a photo agent as their payload. When exposed to a low-intensity 514 nm wavelength (continuous-wave) laser light, these liposomes were observed to release entrapped calcein green (Cal-G; Ex/Em 490/517 nm) but not calcein blue (Cal-B; Ex/Em 360/460 nm). In this study, we have investigated the mechanism for the 514 nm laser-triggered release of the Cal-G payload using several scavengers that are known specifically to inhibit either type I or type II photoreaction pathways. Liposomes containing DPPC:DC(8,9)PC: distearoylphosphatidylethanolamine (DSPE)-polyethylene glycol (PEG)-2000 (86:10:04 mole ratio) were loaded either with fluorescent (calcein) or nonfluorescent ((3)H-inulin) aqueous markers. In addition, a non-photo-triggerable formulation (1-palmitoyl-2-oleoyl phosphatidylcholine [POPC]:DC(8,9)PC:DSPE-PEG2000) was also studied with the same payloads. The 514 nm wavelength laser exposure on photo-triggerable liposomes resulted in the release of Cal-G but not that of Cal-B or (3)H-inulin, suggesting an involvement of a photoactivated state of Cal-G due to the 514 nm laser exposure. Upon 514 nm laser exposures, substantial hydrogen peroxide (H2O2, ≈100 μM) levels were detected from only the Cal-G loaded photo-triggerable liposomes but not from Cal-B-loaded liposomes (≤10 μM H2O2). The Cal-G release from photo-triggerable liposomes was found to be significantly inhibited by ascorbic acid (AA), resulting in a 70%-80% reduction in Cal-G release. The extent of AA-mediated inhibition of Cal-G release from the liposomes also correlated with the consumption of AA. No AA consumption was detected in the 514 nm laser-exposed Cal B-loaded liposomes, thus confirming a role of photoactivation of Cal-G in liposome destabilization. Inclusion of 100 mM K3Fe(CN)6 (a blocker of electron transfer) in the liposomes substantially inhibited Cal-G release, whereas inclusion of 10 mM sodium azide (a blocker of singlet oxygen of type II photoreaction) in the liposomes failed to block 514 nm laser-triggered Cal-G release. Taken together, we conclude that low-intensity 514 nm laser-triggered release of Cal-G from photo-triggerable liposomes involves the type I photoreaction pathway.
Collapse
Affiliation(s)
- Amichai Yavlovich
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| | - Mathias Viard
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
- Basic Science Program, SAIC-Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Kshitij Gupta
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| | - Jessica Sine
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| | - Mylinh Vu
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| | - Robert Blumenthal
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| | - Darrell B Tata
- Centre for Devices and Radiological Health (CDRH)/Office of Science and Engineering Laboratories(OSEL)/Division of Physics, US Food and Drug Administration, White Oak, MD, USA
| | - Anu Puri
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, MD, USA
| |
Collapse
|
13
|
Punnamaraju S, You H, Steckl AJ. Triggered release of molecules across droplet interface bilayer lipid membranes using photopolymerizable lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7657-64. [PMID: 22548362 DOI: 10.1021/la3011663] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A combination of nonpolymerizable phospholipids (DPPC or DPhPC) and a smaller amount of cross-linking photopolymerizable phospholipids (23:2 DiynePC) is incorporated in an unsupported artificial lipid bilayer formed using the droplet interface bilayer (DIB) approach. The DIB is formed by contacting lipid monolayer-coated aqueous droplets against each other in a dodecane-lipid medium. Cross-linking of the photopolymerizable lipids incorporated in the DIB was obtained by exposure to UV-C radiation (254 nm), resulting in pore formation. The effect of cross-linking on the DIB properties was characterized optically by measuring the diffusion of selectively encapsulated dye molecules (calcein) from one droplet of the DIB to the other droplet. Changes in DIB conductivity due to UV-C exposure were investigated using current-voltage (I-V) measurements. The leakage of dye molecules across the DIB and the increase in DIB conductivity after UV-C exposure indicates the formation of membrane pores. The results indicate that the DIB approach offers a simple and flexible platform for studying phototriggered drug delivery systems in vitro.
Collapse
Affiliation(s)
- S Punnamaraju
- Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221, USA
| | | | | |
Collapse
|
14
|
Yavlovich A, Singh A, Blumenthal R, Puri A. A novel class of photo-triggerable liposomes containing DPPC:DC(8,9)PC as vehicles for delivery of doxorubcin to cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:117-26. [PMID: 20691151 DOI: 10.1016/j.bbamem.2010.07.030] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Revised: 07/20/2010] [Accepted: 07/27/2010] [Indexed: 11/28/2022]
Abstract
Success of nanoparticle-mediated drug delivery is subject to development of optimal drug release strategies within defined space and time (triggered release). Recently, we reported a novel class of photo-triggerable liposomes prepared from dipalmitoyl phosphatidylcholine (DPPC) and photopolymerizable diacetylene phospholipid (DC(8),(9)PC), that efficiently released entrapped calcein (a water soluble fluorescent dye) upon UV (254nm) treatment. To develop these formulations for in vivo applications, we have examined phototriggering of these liposomes by visible light, and the effect of released anticancer drugs on cellular toxicity. Sonicated liposomes containing various ratios of DPPC:DC(8),(9)PC and 4mol% DSPE-PEG2000 were loaded with calcein (Ex/Em, 485/517nm) or a chemotherapy drug, Doxorubicin (DOX, Ex/Em 490/590nm). Our initial experiments showed that 514nm laser treatment of liposomes containing 10 or 20mol% DC(8,9)PC for 1-3min resulted in significant release of calcein. Based on these results, we performed studies with DOX-loaded liposomes. First, biophysical properties (including liposome size and stability) and DOX encapsulation efficiency of the liposomes were determined. Subsequently, the effect of 514nm laser on DOX release, and cellular toxicity by released DOX were examined. Since liposomes using the 86:10:04 mole ratio of DPPC:DC(8),(9)PC:DSPE-PEG2000, showed highest encapsulation of DOX, these formulations were investigated further. We report that (i) liposomes retained about 70% of entrapped DOX at 37°C in the presence of 0-50% serum. (ii) 514nm laser treatment resulted in DOX release from liposomes in a wavelength-specific manner. (iii) Laser treatment of co-cultures containing DOX-loaded liposomes and cells (Raji and MCF-7) resulted in at least 2-3 fold improved cell killing as compared to untreated samples. Taken together, the photo-triggerable liposomes described here may provide a platform for future drug delivery applications. To our knowledge, this is the first report demonstrating improved cell killing following light-triggered release of an encapsulated anticancer agent from photosensitive liposomes.
Collapse
Affiliation(s)
- Amichai Yavlovich
- Membrane Structure and Function Section, Nanobiology Program, NCI-Frederick, Frederick, MD 21702, USA
| | | | | | | |
Collapse
|
15
|
Yavlovich A, Singh A, Tarasov S, Capala J, Blumenthal R, Puri A. DESIGN OF LIPOSOMES CONTAINING PHOTOPOLYMERIZABLE PHOSPHOLIPIDS FOR TRIGGERED RELEASE OF CONTENTS. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2009; 98:97-104. [PMID: 20160877 PMCID: PMC2772073 DOI: 10.1007/s10973-009-0228-8] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We describe a novel class of light-triggerable liposomes prepared from a photo-polymerizable phospholipid DC(8,9)PC (1,2- bis (tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine) and DPPC (1,2-Dipalmitoyl-sn-Glycero-3-Phosphocholine). Exposure to UV (254 nm) radiation for 0-45 minutes at 25 degrees C resulted in photo-polymerization of DC(8,9)PC in these liposomes and the release of an encapsulated fluorescent dye (calcein). Kinetics and extents of calcein release correlated with mol% of DC(8,9)PC in the liposomes. Photopolymerization and calcein release occurred only from DPPC/DC(8,9)PC but not from Egg PC/DC(8,9)PC liposomes. Our data indicate that phase separation and packing of polymerizable lipids in the liposome bilayer are major determinants of photo-activation and triggered contents release.
Collapse
Affiliation(s)
- Amichai Yavlovich
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Alok Singh
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, D.C
| | - Sergey Tarasov
- Structural Biophysics Laboratory, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Jacek Capala
- Radiation Oncology Branch, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Robert Blumenthal
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
| | - Anu Puri
- Membrane Structure and Function Section, Nanobiology Program, Center for Cancer Research, NCI-Frederick, Frederick, MD 21702
- Correspondence to: Membrane Structure and Function Section, CCRNP, NCI-Frederick, NIH Phone 301 846-5069, FAX: 301 846-6210
| |
Collapse
|
16
|
Puri A, Loomis K, Smith B, Lee JH, Yavlovich A, Heldman E, Blumenthal R. Lipid-based nanoparticles as pharmaceutical drug carriers: from concepts to clinic. Crit Rev Ther Drug Carrier Syst 2009; 26:523-80. [PMID: 20402623 PMCID: PMC2885142 DOI: 10.1615/critrevtherdrugcarriersyst.v26.i6.10] [Citation(s) in RCA: 547] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In recent years, various nanotechnology platforms in the area of medical biology, including both diagnostics and therapy, have gained remarkable attention. Moreover, research and development of engineered multifunctional nanoparticles as pharmaceutical drug carriers have spurred exponential growth in applications to medicine in the last decade. Design principles of these nanoparticles, including nanoemulsions, dendrimers, nano-gold, liposomes, drug-carrier conjugates, antibody-drug complexes, and magnetic nanoparticles, are primarily based on unique assemblies of synthetic, natural, or biological components, including but not limited to synthetic polymers, metal ions, oils, and lipids as their building blocks. However, the potential success of these particles in the clinic relies on consideration of important parameters such as nanoparticle fabrication strategies, their physical properties, drug loading efficiencies, drug release potential, and, most importantly, minimum toxicity of the carrier itself. Among these, lipid-based nanoparticles bear the advantage of being the least toxic for in vivo applications, and significant progress has been made in the area of DNA/RNA and drug delivery using lipid-based nanoassemblies. In this review, we will primarily focus on the recent advances and updates on lipid-based nanoparticles for their projected applications in drug delivery. We begin with a review of current activities in the field of liposomes (the so-called honorary nanoparticles), and challenging issues of targeting and triggering will be discussed in detail. We will further describe nanoparticles derived from a novel class of amphipathic lipids called bolaamphiphiles with unique lipid assembly features that have been recently examined as drug/DNA delivery vehicles. Finally, an overview of an emerging novel class of particles (based on lipid components other than phospholipids), solid lipid nanoparticles and nanostructured lipid carriers will be presented. We conclude with a few examples of clinically successful formulations of currently available lipid-based nanoparticles.
Collapse
Affiliation(s)
- Anu Puri
- Center for Cancer Research Nanobiology Program, National Cancer Institute at Frederick, National Institutes of Health, Frederick, MD 21702-1201, USA.
| | | | | | | | | | | | | |
Collapse
|
17
|
Lu MH, Rosenblatt C. Observation of a Nematic Phase in an Aqueous Suspension of Phospholipid Tubules. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259208030765] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Min-Hua Lu
- a Department of Physics , Case Western Reserve University , Cleveland , Ohio , 44106-7079 , U.S.A
| | - Charles Rosenblatt
- b Department of Physics, Department of Macromolecular Science , Case Western Reserve University , Cleveland , Ohio , 44106-7079 , U.S.A
| |
Collapse
|
18
|
Selinger JV, Spector MS, Schnur JM. Theory of Self-Assembled Tubules and Helical Ribbons. J Phys Chem B 2001. [DOI: 10.1021/jp010452d] [Citation(s) in RCA: 221] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan V. Selinger
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Code 6900, 4555 Overlook Avenue, SW, Washington, D.C. 20375
| | - Mark S. Spector
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Code 6900, 4555 Overlook Avenue, SW, Washington, D.C. 20375
| | - Joel M. Schnur
- Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Code 6900, 4555 Overlook Avenue, SW, Washington, D.C. 20375
| |
Collapse
|
19
|
Angelov B, Angelova A, Ionov R. An Amino-Substituted Phenylethynyl-anthracene Probe Shows a Sensitivity to Changes in the Lipid Monolayer Curvature of Nonlamellar Lipid/Water Phases. J Phys Chem B 2000. [DOI: 10.1021/jp993779b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Borislav Angelov
- Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, BG-1113 Sofia, and College of Sciences “Leonardo da Vinci”, P.O. Box 946, BG-1000 Sofia, Bulgaria, and Institute of Applied Physics, Technical University, BG-1156 Sofia, Bulgaria
| | - Angelina Angelova
- Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, BG-1113 Sofia, and College of Sciences “Leonardo da Vinci”, P.O. Box 946, BG-1000 Sofia, Bulgaria, and Institute of Applied Physics, Technical University, BG-1156 Sofia, Bulgaria
| | - Radoslav Ionov
- Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, BG-1113 Sofia, and College of Sciences “Leonardo da Vinci”, P.O. Box 946, BG-1000 Sofia, Bulgaria, and Institute of Applied Physics, Technical University, BG-1156 Sofia, Bulgaria
| |
Collapse
|
20
|
Chiral self-assembled structures from biomolecules and synthetic analogues. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1068-7459(00)80004-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
21
|
Reichel F, Roelofsen AM, Geurts HPM, Hämäläinen TI, Feiters MC, Boons GJ. Stereochemical Dependence of the Self-Assembly of the Immunoadjuvants Pam3Cys and Pam3Cys-Ser. J Am Chem Soc 1999. [DOI: 10.1021/ja991319q] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frank Reichel
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| | - Annie M. Roelofsen
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| | - Hubertus P. M. Geurts
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| | - Taina I. Hämäläinen
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| | - Martinus C. Feiters
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| | - Geert-Jan Boons
- Contribution from the School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, Department of Organic Chemistry, NSR Institute for Molecular Structure, Design and Synthesis, University of Nijmegen, Toernooiveld, NL 6525 ED Nijmegen, The Netherlands, and Department of Organic Chemistry, Central Microscopy Facility, University of Nijmegen, Tornooiveld, NL 6525 ED Nijmegen, The Netherlands
| |
Collapse
|
22
|
Giulieri F, Guillod F, Greiner J, Krafft MP, Riess JG. Anionic Glucophospholipids—A New Family of Tubule-Forming Amphiphiles. Chemistry 1996. [DOI: 10.1002/chem.19960021022] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
23
|
Singh A, Markowitz M, Chow G. Materials fabrication via polymerizable selforganized membranes: An overview. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0965-9773(95)00017-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
24
|
Rhodes DG, Hui SW, Xu YH, Byun HS, Singh M, Bittman R. Structure of polymerizable lipid bilayers VII: lateral organization of diacetylenic phosphatidylcholines with short proximal acyl chains. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1215:237-44. [PMID: 7811706 DOI: 10.1016/0005-2760(94)90048-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
As an extension of recent results (Rhodes, Xu and Bittman (1992) Biochim. Biophys. Acta 1128, 93; Hui, Xu and Bittman (1992) Langmuir 8, 2724) with a C18 diacetylenic phosphatidylcholine, bilayers of 1,2-bis(pentacosa-4,6-diynoyl)-sn-glycero-3-phosphocholine (C25) were investigated using X-ray diffraction on multibilayers and electron diffraction on Langmuir-Blodgett deposited bilayers. Monolayers of this lipid form solid (gel phase) domains at pi > 14 mN/m. Electron diffraction data indicated that the chain spacing in these domains is 4.25 A and that the chains are tilted at angle of approximately 35 degrees relative to the bilayer plane. Wide angle data from X-ray diffraction experiments indicated a similar spacing and chain tilt. Small angle data showed that the lamellar repeat was 70 A at high humidity and < or = 60 A at low humidity. The bilayer electron density profiles indicated a bilayer structure with no interdigitation. High angle reflections indicate that the principal acyl chain repeat is preserved as a function of hydration but some rearrangement occurs for other reflections. The approximately 10 A reflection corresponding to the headgroup spacing previously observed with C18-diacetylenic phosphatidylcholine bilayers was not observed. The results are interpreted in terms of a packing model and possible limitations or constraints to the polymerization process.
Collapse
Affiliation(s)
- D G Rhodes
- Pharmaceutics Division, College of Pharmacy, University of Texas at Austin 78712-1074
| | | | | | | | | | | |
Collapse
|
25
|
Jendrasiak GL, Ribeiro AA, Nagumo MA, Schoen PE. A temperature study of diacetylenic phosphatidylcholine vesicles. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1194:233-8. [PMID: 7918537 DOI: 10.1016/0005-2736(94)90304-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Dispersions of the diacetylenic phosphatidylcholine, 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine, DC8,9PC, undergo a change from vesicles to hollow tubes on cooling. We report here a light scattering and multinuclear NMR study of the lipid vesicles over the temperature range 0-50 degrees C. The 'splitting' of the N+(CH3)3 resonance increases with decreasing temperature, consistent with the light scattering measurements which show a decrease in vesicle size with decreasing temperature. The NMR spectrum remains well-resolved over this temperature range, even at temperatures as low as 3 degrees C. Phosphorus NMR also indicates that the 'bilayer structure' is maintained over this temperature range. The various proton resonances and the phosphorous signal from the lipid vesicles broaden as the temperature is lowered. These results will be helpful in developing a model for the tubule-forming ability of DC8,9PC.
Collapse
Affiliation(s)
- G L Jendrasiak
- Department of Radiation Oncology, East Carolina University School of Medicine, Greenville, NC 27858
| | | | | | | |
Collapse
|
26
|
Abstract
The use of molecular self-assembly to fabricate microstructures suitable for advanced material development is described. Templating techniques that transform biomolecular self-assemblies into rugged and stable nano- and microstructures are described. By using a lipid-based microcylinder (tubule) as a paradigm, the path followed from research and development to emerging technological applications is detailed. This process includes modification of the lipid molecular structure, the formation and subsequent characterization of cylindrical microstructures, the use of these structures as templates for metallization, and the characterization and assessment of these hollow metal microcylinders for several potential applications.
Collapse
|
27
|
Schoen P, Price R, Schnur J, Gulik A, Gulik-Krzywicki T. Formation of lipid tubule microstructures: time-resolved freeze-fracture electron microscopy and X-ray characterization. Chem Phys Lipids 1993. [DOI: 10.1016/0009-3084(93)90016-v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
28
|
Rhodes DG, Xu Z, Bittman R. Structure of polymerizable lipid bilayers. V. Synthesis, bilayer structure and properties of diacetylenic ether and ester lipids. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1128:93-104. [PMID: 1390881 DOI: 10.1016/0005-2760(92)90262-t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Four diacetylenic phosphatidylcholines (PC's) have been synthesized and the structures of bilayers of these lipids have been determined at low resolution by low-angle X-ray diffraction. The PC's all have 18-carbon chains but differ with respect to the ether/ester linkage at the sn-1 and sn-2 positions and the relative position of the diacetylene moiety: diester-PC (1): 1,2-bis(octadeca-4',6'-diynoyl)-sn-glycero-3-phosphocholine diester-PC (2): 1-(octadeca-4',6'-diynoyl)-2-(octadeca-5',7'-diynoy l)-sn- glycero-3-phosphocholine diester-PC (3): 1,2-bis(octadeca-8',10'-diynoyl)-sn-glycerol-3-phosphocholin e diether-PC (4): 1-O-(octadeca-4',6'-diynyl)-2-O-(octadeca-5",7"-din yl)-sn- glycero-3-phosphocholine Only (1) exhibits the typical bilayer profile, whereas (2), (3) and (4) show evidence of interdigitation and/or significant disorder. Only (1) polymerized effectively upon illumination with 254 nm light, turning deep blue in seconds, indicating the formation of long, well-ordered polydiacetylenic structures. Liposomes of these derivatives were tested for permeability by osmotic swelling. Polymerized liposomes of (1) underwent osmotic swelling with urea, glycerol, and acetamide more rapidly than did liposomes of stearoyl-oleoyl-PC, but the initial rates of osmotic swelling of polymerized liposomes of (1) were 3-10-times lower than those of unpolymerized liposomes of (1). Blue polymerized multilayer samples of (1) exhibited an irreversible thermochromic transition to red at approx. 40 degrees C. Differential scanning calorimetry with liposome suspensions of (1) revealed an endotherm at 28.3 degrees C with a transition enthalpy of 40 J/g. PC (1) is a potentially useful diacetylenic lipid which exhibits facile, complete polymerization and a bilayer thickness comparable to that of biomembrane lipids.
Collapse
Affiliation(s)
- D G Rhodes
- Department of Radiology, University of Connecticut Health Center, Farmington 06032
| | | | | |
Collapse
|
29
|
|
30
|
Rudolph AS, Testoff MA, Shashidar R. Calorimetric studies of lipid tubule formation from ethanol-water solutions. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1127:186-90. [PMID: 1643105 DOI: 10.1016/0005-2760(92)90276-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have used differential scanning calorimetry to systematically investigate the thermal formation of hollow cylindrical crystalline microstructures or 'tubules' upon cooling a diacetylenic phosphatidylcholine (1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine) dispersed in varying volume fractions of ethanol/water. Tubule formation is characterized by a large exothermic event, observed upon cooling the lipid in 60-80% ethanol. The enthalpy of the transition was observed to be highest in this window of tubule formation (128-138 J/g) which is significantly higher than previously reported values for the enthalpy of tubule formation in water (90 -95 J/g). The enthalpy associated with the formation of tubules in 70% ethanol was also found to be strongly dependent on the efficiency of tubule formation and decreased as the number density of tubules decreased. A significant decrease in tubule number density could be brought about by increasing the lipid concentration of the 70% ethanol solution. Tubule number density was maximized at lipid concentrations between 0.5 and 2 mg/ml in 70% ethanol. Examination of the C-H stretch region from infrared spectra of the lipid below the phase transition, indicate that the intramolecular chain order-disorder is similar, regardless of the fraction of ethanol. The higher transition enthalpy for the melting of tubules in 60-80% ethanol (compared to water) implies that the high-temperature phase from which the tubules form in ethanol is more disordered than the lamellar liquid crystalline phase from which tubules form in water.
Collapse
Affiliation(s)
- A S Rudolph
- Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC
| | | | | |
Collapse
|
31
|
Rudolph AS, Stilwell G, Cliff RO, Kahn B, Spargo BJ, Rollwagen F, Monroy RL. Biocompatibility of lipid microcylinders: effect on cell growth and antigen presentation in culture. Biomaterials 1992; 13:1085-92. [PMID: 1493192 DOI: 10.1016/0142-9612(92)90141-a] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The authors are developing a lipid-based microcylinder for the controlled release of biological response modifiers and as templates for cellular migration and differentiation. These structures are comprised of a photopolymerizable phosphatidylcholine (1,2-ditricosa-10,12-diynoyl-sn-glycero-3-phosphocholine) and form spontaneously as a result of a thermotropic phase transition in aqueous solution or in a cosolvent solution of 70:30 ethanol:water. The hollow cylinders are helically wrapped lipid bilayers, variable in length (50-250 microns, depending on conditions of formation) and are 0.5-1.0 microns in diameter. The interaction has been examined of three types of lipid microcylinders: (1) monomeric, (2) photopolymerized by exposure to 254 nm light, and (3) surface-modified by incorporation of 6 mol% gangliosides, with different human cell lines and peripheral blood leucocytes to evaluate the biocompatibility of these structures. The proliferative status of U937 (a histiocytic monocyte), K562 (an erythroleukaemic cell), and Jurkat's derivative (a T-lymphoblast) as measured by pulsed tritiated thymidine was unaffected by the presence of up to 100 micrograms/ml of lipid microcylinders after 3 d in culture. Adherent human peripheral blood monocytes were shown to form adhesive contacts with the lipid microcylinders. An 'association' index from this interaction shows that after 3 d in culture, the association was much lower for those microcylinders that had incorporated ganglioside compared with monomeric or polymerized structures. The lipid microcylinders do not activate T-cells isolated from human peripheral blood, nor do they inhibit the activation of T-cells by phorbol esters or other mitogens.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- A S Rudolph
- Center for Biomolecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375-5000
| | | | | | | | | | | | | |
Collapse
|
32
|
Chappell JS, Yager P. Electrolyte effects on bilayer tubule formation by a diacetylenic phospholipid. Biophys J 1991; 60:952-65. [PMID: 1742462 PMCID: PMC1260146 DOI: 10.1016/s0006-3495(91)82129-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
A general effect by dissolved electrolytes to destabilize the curvature of bilayer tubules prepared from the diacetylenic phospholipid, 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine is not found. This observation discounts the role of an electrostatic interaction between polarization charges on the edges of a ferroelectric bilayer as a means by which the cylindrical curvature may be stabilized in these structures (de Gennes, P. G. 1987. C. R. Acad. Sci. Paris. 304:259-263). The solution-mediated ionic interactions of electrolytes with this phospholipid appear not to influence significantly the relative stability of the crystalline state of the tubule, but at high levels of a few salts, may affect the nucleation and growth of the crystalline bilayer. Curvature of the bilayer in these tubular structures apparently derives from an interaction that is not very sensitive to the presence of electrolytes. Cylindrical curvature may alternatively arise from a bending force within the bilayer that is intrinsic to the anisotropic packing of the lipid molecules (Helfrich, W., and J. Prost. 1988. Phys. Rev. A38:3065-3068; Chappell, J. S., and P. Yager. 1991. Chem. Phys. Lipids. In press), and may therefore be largely determined by the packing interactions within the hydrophobic region of the tubular bilayer.
Collapse
Affiliation(s)
- J S Chappell
- Molecular Bioengineering Program, University of Washington, Seattle 98195
| | | |
Collapse
|
33
|
Rhodes DG, Singh A. Structure of polymerizable lipid bilayers IV. Mixtures of long chain diacetylenic and short chain saturated phosphatidylcholines and analogous asymmetric isomers. Chem Phys Lipids 1991; 59:215-24. [PMID: 1804565 DOI: 10.1016/0009-3084(91)90021-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Polymerization of 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC8,9PC) is enhanced by addition of short-chain saturated phosphatidylcholines such as 1,2-dinonanoyl-sn-glycero-3- phosphocholine (DNPC). Because of well established constraints on the topochemical polymerisation process, we undertook structure-based experiments to determine the nature of this effect. Two hypotheses were tested: (a) that the DNPC crystalized the proximal (m) and disordered the distal (n) methylene segments of DC8,9PC, thus providing flexibility to accommodate the conformational change upon polymer formation, or (b) that the DNPC forced lateral displacement of DC8,9PC, which would then allow interdigitation of these segments with those of the opposing monolayer and potentially more crystalline alignment of the diacetylene. Low angle X-ray diffraction studies do not support the interdigiated chain model. However, these measurements also indicate that the two lipid species may be phase separated under many conditions. An analogous structure, 1-(tricosa-10,12-diynoyl)2-nonanoyl-sn-glycero-3- phosphocholine (C8,9NPC) did not polymerize, and low angle X-ray diffraction studies indicate that bilayers of this lipid were interdigitated such that the terminal methyl group of the tricosadiynoyl chain on each lipid in the bilayer was adjacent to the diacetylenic moiety of a lipid on the opposing monolayer. Implications of these findings pertinent to identifying significant factors in polymerization of diacetylenic phospholipid bilayers are discussed.
Collapse
Affiliation(s)
- D G Rhodes
- Department of Radiology, University of Connecticut Health Center, Farmington 06032
| | | |
Collapse
|
34
|
Mutz M, Bensimon D, Brienne MJ. Wrinkling transition in partially polymerized vesicles. PHYSICAL REVIEW LETTERS 1991; 67:923-926. [PMID: 10045023 DOI: 10.1103/physrevlett.67.923] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
35
|
Chappell J, Yager P. A model for crystalline order within helical and tubular structures of chiral bilayers. Chem Phys Lipids 1991. [DOI: 10.1016/0009-3084(91)90100-p] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
36
|
Blechner SL, Morris W, Schoen PE, Yager P, Singh A, Rhodes DG. Structure of polymerizable lipid bilayers III: two heptacosadiynoyl phosphatidylcholine isomers. Chem Phys Lipids 1991. [DOI: 10.1016/0009-3084(91)90110-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
37
|
Abstract
Polymerizable lipids have received considerable attention in the last ten years as polymerization of lipids in vesicle systems is a possibility to increase the stability of lipid bilayers. Lipids with various polymerizable groups have been synthesized in the last years. This paper is focussed on those lipids which are closely related to natural phospholipids, i.e. molecules which have two hydrophobic chains and a head group containing a phosphate moiety. The phase behaviour of polymerizable phospholipids as lipid monomers and in the polymerized state is reviewed and discussed.
Collapse
Affiliation(s)
- A Blume
- Fachbereich Chemie, Universität Kaiserslautern, F.R.G
| |
Collapse
|
38
|
Caffrey M, Hogan J, Rudolph AS. Diacetylenic lipid microstructures: structural characterization by X-ray diffraction and comparison with the saturated phosphatidylcholine analogue. Biochemistry 1991; 30:2134-46. [PMID: 1998674 DOI: 10.1021/bi00222a018] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Thermotropic and lyotropic mesomorphism in the polymerizable lecithin 1,2-ditricosa-10,12-diynoyl-sn-glycero-3-phosphocholine and its saturated analogue, 1,2-ditricosanoyl-sn-glycero-3-phosphocholine, has been investigated by wide- and low-angle X-ray diffraction of both powder and oriented samples and by differential scanning calorimetry. Previous studies have shown that the hydrated diacetylenic lipid forms novel microstructures (tubules and stacked bilayer sheets) in its low-temperature phase. The diffraction results indicate that at low temperatures fully hydrated tubules and sheets have an identical lamellar repeat size (d001 = 66.4 A) and crystalline-like packing of the acyl chains. Chain packing in the lamellar crystalline phase is hydration independent. A model for the polymerizable lecithin with (1) fully extended all-trans methylene segments, (2) a long-axis tilt of 32 degrees, and (3) minimal chain interdigitation seems most reasonable on energetic grounds, is consistent with the diffraction data (to 3.93-A resolution), and is likely to support facile polymerization. Above the chain "melting" transition the lamellar repeat of the polymerizable lipid increases to 74 A. The conformational similarity between tubules, sheets, and the dry powder is corroborated by calorimetry, which reveals a cooling exotherm at the same temperature where tubules form upon cooling hydrated sheets. The data suggest that although a high degree of conformational order is a pertinent feature of tubules, this character alone is not sufficient to account for tubule formation. The conformation of the corresponding saturated phosphatidylcholine appears to be similar to that of other saturated phosphatidylcholines in the lamellar gel phase. Furthermore, above the main transition temperature, the dry, saturated lipid shows evidence of a P delta phase (112 degrees C), whereas the diacetylenic lipid appears to exhibit a centered rectangular phase, R alpha (55 degrees C).
Collapse
Affiliation(s)
- M Caffrey
- Department of Chemistry, Ohio State University, Columbus 43210
| | | | | |
Collapse
|
39
|
Blechner SL, Skita V, Rhodes DG. Structure of polymerizable lipid bilayers: water profile of a diacetylenic lipid bilayer using elastic neutron scattering. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1022:291-5. [PMID: 2317485 DOI: 10.1016/0005-2736(90)90276-t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Elastic neutron scattering experiments have been used to study the hydration of multibilayers of 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DC8,9PC). Previously published FTIR spectroscopic data had suggested, based on shifts in the carbonyl (C = O) stretch frequencies, that the phosphocholine headgroup in these polymerizable lipid bilayers was much less hydrated than that of saturated phosphatidylcholines. Our results demonstrate that the DC8,9PC headgroup is at least as well hydrated as that of dipalmitoylphosphatidylcholine (DPPC), a saturated lipid, under the same conditions.
Collapse
Affiliation(s)
- S L Blechner
- Department of Radiology, University of Connecticut Health Center, Farmington 06032
| | | | | |
Collapse
|