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Dai L, Li S, Hao Q, Zhou R, Zhou H, Lei W, Kang H, Wu H, Li Y, Ma X. Low-density lipoprotein: a versatile nanoscale platform for targeted delivery. NANOSCALE ADVANCES 2023; 5:1011-1022. [PMID: 36798503 PMCID: PMC9926902 DOI: 10.1039/d2na00883a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 01/06/2023] [Indexed: 06/18/2023]
Abstract
Low-density lipoprotein (LDL) is a small lipoprotein that plays a vital role in controlling lipid metabolism. LDL has a delicate nanostructure with unique physicochemical properties: superior payload capacity, long residence time in circulation, excellent biocompatibility, smaller size, and natural targeting. In recent decades, the superiority and feasibility of LDL particles as targeted delivery carriers have attracted much attention. In this review, we introduce the structure, composition, advantages, defects, and reconstruction of LDL delivery systems, summarize their research status and progress in targeted diagnosis and therapy, and finally look forward to the clinical application of LDL as an effective delivery vehicle.
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Affiliation(s)
- Luyao Dai
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Shuaijun Li
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Qian Hao
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Ruina Zhou
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Hui Zhou
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Wenxi Lei
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Huafeng Kang
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
| | - Hao Wu
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
- Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, University of California Davis Sacramento CA 95817 USA
- Department of Biophysics, School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi 710061 China
| | - Yuanpei Li
- Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, University of California Davis Sacramento CA 95817 USA
| | - Xiaobin Ma
- Department of Oncology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University Xi'an Shaanxi 710061 China
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Geng W, Zou H, Wang H, Dai Y, Lu G, Sun Z, Lu Y, Ding X, Yu Y. Dual-triggered biomimetic vehicles enable treatment of glioblastoma through a cancer stem cell therapeutic strategy. NANOSCALE 2021; 13:7202-7219. [PMID: 33889875 DOI: 10.1039/d0nr08899d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Glioma stem cells (GSCs) and their complex microenvironment play a crucial role in the high invasion of cancer and therapeutic resistance and are considered to be the most likely cause of cancer relapse. We constructed a biomimetic vehicle (LDL-SAL-Ang) based on a low density lipoprotein triggered by Angiopep-2 peptide and ApoB protein, to improve the transport of an anti-GSC therapeutic agent into the brain. The LDL-SAL-Ang showed significant inhabitation for GSC microsphere formation and induced the highest apoptotic rate in two types of GSCs. LDL-SAL-Ang reduced the number of GSC-derived endothelial tubules at a lower drug concentration and inhibited endothelial cell migration and angiogenesis. The pharmacokinetic analysis showed that the brain tissue uptake rate (% ID g-1) for LDL-SAL-Ang was significantly enhanced at 0.45. For anti-glioblastoma activity in vivo, the median survival time of LDL-SAL-Ang plus temozolomide group was 47 days, which were significantly increased compared with the control or temozolomide only groups. The endogenous biomimetic nanomedicine that we designed provides a potential approach to improve treatments for intracranial tumors and reduced neurotoxicity of nanomedicine.
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Affiliation(s)
- Wenqian Geng
- Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China.
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3
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Alanazi SA, Alanazi F, Haq N, Shakeel F, Badran MM, Harisa GI. Lipoproteins-Nanocarriers as a Promising Approach for Targeting Liver Cancer: Present Status and Application Prospects. Curr Drug Deliv 2020; 17:826-844. [PMID: 32026776 DOI: 10.2174/1567201817666200206104338] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/27/2019] [Accepted: 01/28/2020] [Indexed: 12/14/2022]
Abstract
The prevalence of liver cancer is increasing over the years and it is the fifth leading cause of mortality worldwide. The intrusive features and burden of low survival rate make it a global health issue in both developing and developed countries. The recommended chemotherapy drugs for patients in the intermediate and advanced stages of various liver cancers yield a low response rate due to the nonspecific nature of drug delivery, thus warranting the search for new therapeutic strategies and potential drug delivery carriers. There are several new drug delivery methods available to ferry the targeted molecules to the specific biological environment. In recent years, the nano assembly of lipoprotein moieties (lipidic nanoparticles) has emerged as a promising and efficiently tailored drug delivery system in liver cancer treatment. This increased precision of nano lipoproteins conjugates in chemotherapeutic targeting offers new avenues for the treatment of liver cancer with high specificity and efficiency. This present review is focused on concisely outlining the knowledge of liver cancer diagnosis, existing treatment strategies, lipoproteins, their preparation, mechanism and their potential application in the treatment of liver cancer.
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Affiliation(s)
- Saleh A Alanazi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Fars Alanazi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Nazrul Haq
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed M Badran
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Gamaleldin I Harisa
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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4
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Wen R, Umeano AC, Kou Y, Xu J, Farooqi AA. Nanoparticle systems for cancer vaccine. Nanomedicine (Lond) 2019; 14:627-648. [PMID: 30806568 PMCID: PMC6439506 DOI: 10.2217/nnm-2018-0147] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 11/28/2018] [Indexed: 01/01/2023] Open
Abstract
As effective tools for public health, vaccines prevent disease by priming the body's adaptive and innate immune responses against an infection. Due to advances in understanding cancers and their relationship with the immune system, there is a growing interest in priming host immune defenses for a targeted and complete antitumor response. Nanoparticle systems have shown to be promising tools for effective antigen delivery as vaccines and/or for potentiating immune response as adjuvants. Here, we highlight relevant physiological processes involved in vaccine delivery, review recent advances in the use of nanoparticle systems for vaccines and discuss pertinent challenges to viably translate nanoparticle-based vaccines and adjuvants for public use.
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Affiliation(s)
- Ru Wen
- Department of Chemistry, University of Georgia, Athens, GA 30602, USA
| | - Afoma C Umeano
- Department of Molecular & Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Yi Kou
- Department of Molecular & Computational Biology, University of Southern California, Los Angeles, CA 90089, USA
| | - Jian Xu
- Laboratory of Cancer Biology & Genetics, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Ammad Ahmad Farooqi
- Institute of Biomedical and Genetic Engineering (IBGE), Islamabad, 54000, Pakistan
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Lin Q, Deng D, Song X, Dai B, Yang X, Luo Q, Zhang Z. Self-Assembled "Off/On" Nanopomegranate for In Vivo Photoacoustic and Fluorescence Imaging: Strategic Arrangement of Kupffer Cells in Mouse Hepatic Lobules. ACS NANO 2019; 13:1526-1537. [PMID: 30716272 DOI: 10.1021/acsnano.8b07283] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Kupffer cells (KCs), potent scavenger cells located in hepatic sinusoids, constantly phagocytize and degrade foreign materials to maintain metabolism and clearance. Understanding the strategic KC arrangement which links to their spatial location and function in hepatic lobules, the basic functional unit in the liver, is highly valuable for characterizing liver function. However, selectively labeling KCs and characterizing their function in vivo remains challenging. Herein, a fast self-assembled pomegranate structure-like nanoparticle with "nanopomegranate seeds" of dye aggregates has been developed, which has dual-modality "off/on" capability. This nanopomegranate shows good photostability, a high extinction coefficient, a high KC labeling efficiency (98.8%), and better visualization of KC morphology than commercial FluoSpheres. In vivo photoacoustic (PA) and fluorescence imaging consistently visualize that KCs are strategically distributed along the central vein (CV)-portal triad (PT) axis in each liver lobule: more and larger KCs exist in areas closer to the PTs. The high-resolution PA quantitative data further revealed that the density of KCs was linearly dependent on the r n/ rmax ratio (their relative location along the CV-PT axis) ( R2 = 0.7513), and the KC density at the outermost layer is almost 246-fold that at the innermost layer (each layer is 8 μm). Notably, the phagocytic ability of KCs located in layers with r n/ rmax ratios of 0.167-0.3 varies in a zigzag pattern, as evidenced by their different PA intensities. Additionally, the fluorescence imaging quantitation suggests similar fluorescence activation of nanopomegranate in KCs. Nanopomegranates combined with dual-modality imaging reveal the strategic arrangement of KCs in vivo, greatly extending our understanding of liver physiology.
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Affiliation(s)
- Qiaoya Lin
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Deqiang Deng
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Xianlin Song
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Bolei Dai
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Xiaoquan Yang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Qingming Luo
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
| | - Zhihong Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences , Huazhong University of Science and Technology , Wuhan , Hubei , 430074 , China
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Zhu C, Xia Y. Biomimetics: reconstitution of low-density lipoprotein for targeted drug delivery and related theranostic applications. Chem Soc Rev 2017; 46:7668-7682. [PMID: 29104991 PMCID: PMC5725233 DOI: 10.1039/c7cs00492c] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low-density lipoprotein (LDL), one of the four major groups of lipoproteins for lipid transport in vivo, is emerging as an attractive carrier for the targeted delivery of theranostic agents. In contrast to the synthetic systems, LDL particles are intrinsically biocompatible and biodegradable, together with reduced immunogenicity and natural capabilities to target cancerous cells and to escape from the recognition and elimination by the reticuloendothelial system. Enticed by these attributes, a number of strategies have been developed for reconstituting LDL particles, including conjugation to the apolipoprotein, insertion into the phospholipid layer, and loading into the core. Here we present a tutorial review on the development of reconstituted LDL (rLDL) particles for theranostic applications. We start with a brief introduction to LDL and LDL receptor, as well as the advantages of using rLDL particles as a natural and versatile platform for the targeted delivery of theranostic agents. After a discussion of commonly used strategies for the reconstitution of LDL, we highlight the applications of rLDL particles in the staging of disease progression, treatment of lesioned tissues, and delivery of photosensitizers for photodynamic cancer therapy. We finish this review with a perspective on the remaining challenges and future directions.
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Affiliation(s)
- Chunlei Zhu
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA.
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7
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VLDL/LDL acts as a drug carrier and regulates the transport and metabolism of drugs in the body. Sci Rep 2017; 7:633. [PMID: 28377633 PMCID: PMC5428859 DOI: 10.1038/s41598-017-00685-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 03/08/2017] [Indexed: 01/01/2023] Open
Abstract
Only free drugs have been believed to be carried into tissues through active or passive transport. However, considering that lipoproteins function as carriers of serum lipids such as cholesterol and triglycerides, we hypothesized that lipoproteins can associate with certain drugs and mediate their transport into tissues in lipid-associated form. Here, in vitro and in vivo studies with low density lipoprotein receptor (LDLR)-overexpressing or -knockdown cells and wild-type or LDLR-mutant mice were used to show the association of various drugs with lipoproteins and the uptake of lipoprotein-associated drugs through a lipoprotein receptor-mediated process. In clinical studies, investigation of the effect of lipoprotein apheresis on serum drug concentrations in patients with familial hypercholesterolemia demonstrated that lipoprotein-mediated drug transport occurs in humans as well as in mice. These findings represent a new concept regarding the transport and metabolism of drugs in the body and suggest that the role of lipoprotein-mediated drug transport should be considered when developing effective and safe pharmacotherapies.
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8
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Elucidating the structural organization of a novel low-density lipoprotein nanoparticle reconstituted with docosahexaenoic acid. Chem Phys Lipids 2017; 204:65-75. [PMID: 28342772 DOI: 10.1016/j.chemphyslip.2017.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 03/15/2017] [Accepted: 03/17/2017] [Indexed: 11/20/2022]
Abstract
Low-density lipoprotein nanoparticles reconstituted with unesterified docosahexaenoic acid (LDL-DHA) is promising nanomedicine with enhanced physicochemical stability and selective anticancer cytotoxic activity. The unique functionality of LDL-DHA ultimately relates to the structure of this nanoparticle. To date, however, little is known about the structural organization of this nanoparticle. In this study chemical, spectroscopic and electron microscopy analyses were undertaken to elucidate the structural and molecular organization of LDL-DHA nanoparticles. Unesterified DHA preferentially incorporates into the outer surface layer of LDL, where in this orientation the anionic carboxyl end of DHA is exposed to the LDL surface and imparts an electronegative charge to the nanoparticles surface. This negative surface charge promotes the monodisperse and homogeneous distribution of LDL-DHA nanoparticles in solution. Further structural analyses with cryo-electron microscopy revealed that the LDL-DHA nanostructure consist of a phospholipid bilayer surrounding an aqueous core, which is distinctly different from the phospholipid monolayer/apolar core organization of plasma LDL. Lastly, apolipoprotein B-100 remains strongly associated with this complex and maintains a discrete size and shape of the LDL-DHA nanoparticles similar to plasma LDL. This preliminary structural assessment of LDL-DHA now affords the opportunity to understand the important structure-function relationships of this novel nanoparticle.
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Almer G, Mangge H, Zimmer A, Prassl R. Lipoprotein-Related and Apolipoprotein-Mediated Delivery Systems for Drug Targeting and Imaging. Curr Med Chem 2016; 22:3631-51. [PMID: 26180001 PMCID: PMC5403973 DOI: 10.2174/0929867322666150716114625] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 06/19/2015] [Accepted: 07/13/2015] [Indexed: 01/27/2023]
Abstract
The integration of lipoprotein-related or apolipoprotein-targeted nanoparticles as pharmaceutical carriers opens new therapeutic and diagnostic avenues in nanomedicine. The concept is to exploit the intrinsic characteristics of lipoprotein particles as being the natural transporter of apolar lipids and fat in human circulation. Discrete lipoprotein assemblies and lipoprotein-based biomimetics offer a versatile nanoparticle platform that can be manipulated and tuned for specific medical applications. This article reviews the possibilities for constructing drug loaded, reconstituted or artificial lipoprotein particles. The advantages and limitations of lipoproteinbased delivery systems are critically evaluated and potential future challenges, especially concerning targeting specificity, concepts for lipoprotein rerouting and design of innovative lipoprotein mimetic particles using apolipoprotein sequences as targeting moieties are discussed. Finally, the review highlights potential medical applications for lipoprotein-based nanoparticle systems in the fields of cardiovascular research, cancer therapy, gene delivery and brain targeting focusing on representative examples from literature.
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Affiliation(s)
| | | | | | - Ruth Prassl
- Institute of Biophysics, Medical University of Graz, Harrachgasse 21/6, A-8010 Graz, Austria.
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Huang H, Cruz W, Chen J, Zheng G. Learning from biology: synthetic lipoproteins for drug delivery. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2015; 7:298-314. [PMID: 25346461 PMCID: PMC4397116 DOI: 10.1002/wnan.1308] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 08/22/2014] [Accepted: 09/02/2014] [Indexed: 12/15/2022]
Abstract
Synthetic lipoproteins represent a relevant tool for targeted delivery of biological/chemical agents (chemotherapeutics, siRNAs, photosensitizers, and imaging contrast agents) into various cell types. These nanoparticles offer a number of advantages for drugs delivery over their native counterparts while retaining their natural characteristics and biological functions. Their ultra-small size (<30 nm), high biocompatibility, favorable circulation half-life, and natural ability to bind specific lipoprotein receptors, i.e., low-density lipoprotein receptor (LDLR) and Scavenger receptor class B member 1 (SRB1) that are found in a number of pathological conditions (e.g., cancer, atherosclerosis), make them superior delivery strategies when compared with other nanoparticle systems. We review the various approaches that have been developed for the generation of synthetic lipoproteins and their respective applications in vitro and in vivo. More specifically, we summarize the approaches employed to address the limitation on use of reconstituted lipoproteins by means of natural or recombinant apolipoproteins, as well as apolipoprotein mimetic molecules. Finally, we provide an overview of the advantages and disadvantages of these approaches and discuss future perspectives for clinical translation of these nanoparticles.
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Affiliation(s)
- Huang Huang
- DLVR Therapeutics Inc., Toronto, Canada
- Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada M5G 1L7
| | - William Cruz
- DLVR Therapeutics Inc., Toronto, Canada
- Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada M5G 1L7
| | - Juan Chen
- Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada M5G 1L7
| | - Gang Zheng
- Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada M5G 1L7
- Department of Medical Biophysics, University of Toronto, Toronto, ON Canada M5G 1L7
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Abstract
Disease heterogeneity within and between patients necessitates a patient-focused approach to cancer treatment. This exigency forms the basis for the medical practice termed personalized medicine. An emerging, important component of personalized medicine is theranostics. Theranostics describes the co-delivery of therapeutic and imaging agents in a single formulation. Co-delivery enables noninvasive, real-time visualization of drug fate, including drug pharmacokinetic and biodistribution profiles and intratumoral accumulation. These technological advances assist drug development and ultimately may translate to improved treatment planning at the bedside. Nanocarriers are advantageous for theranostics as their size and versatility enables integration of multiple functional components in a single platform. This chapter focuses on recent developments in advanced lipid theranostic nanomedicine from the perspective of the "all-in-one" or the "one-for-all" approach. The design paradigm of "all-in-one" is the most common approach for assembling theranostic lipid nanoparticles, where the advantages of theranostics are achieved by combining multiple components that each possesses a specific singular function for therapeutic activity or imaging contrast. We will review lipoprotein nanoparticles and liposomes as representatives of the "all-in-one" approach. Complementary to the "all-in-one" approach is the emerging paradigm of the "one-for-all" approach where nanoparticle components are intrinsically multifunctional. We will discuss the "one-for-all" approach using porphysomes as a representative. We will further discuss how the concept of "one-for-all" might overcome the regulatory hurdles facing theranostic lipid nanomedicine.
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Lin Q, Jin CS, Huang H, Ding L, Zhang Z, Chen J, Zheng G. Nanoparticle-enabled, image-guided treatment planning of target specific RNAi therapeutics in an orthotopic prostate cancer model. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:3072-3082. [PMID: 24706435 DOI: 10.1002/smll.201303842] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Indexed: 06/03/2023]
Abstract
The abilities to deliver siRNA to its intended action site and assess the delivery efficiency are challenges for current RNAi therapy, where effective siRNA delivery will join force with patient genetic profiling to achieve optimal treatment outcome. Imaging could become a critical enabler to maximize RNAi efficacy in the context of tracking siRNA delivery, rational dosimetry and treatment planning. Several imaging modalities have been used to visualize nanoparticle-based siRNA delivery but rarely did they guide treatment planning. We report a multimodal theranostic lipid-nanoparticle, HPPS(NIR)-chol-siRNA, which has a near-infrared (NIR) fluorescent core, enveloped by phospholipid monolayer, intercalated with siRNA payloads, and constrained by apoA-I mimetic peptides to give ultra-small particle size (<30 nm). Using fluorescence imaging, we demonstrated its cytosolic delivery capability for both NIR-core and dye-labeled siRNAs and its structural integrity in mice through intravenous administration, validating the usefulness of NIR-core as imaging surrogate for non-labeled therapeutic siRNAs. Next, we validated the targeting specificity of HPPS(NIR)-chol-siRNA to orthotopic tumor using sequential four-steps (in vivo, in situ, ex vivo and frozen-tissue) fluorescence imaging. The image co-registration of computed tomography and fluorescence molecular tomography enabled non-invasive assessment and treatment planning of siRNA delivery into the orthotopic tumor, achieving efficacious RNAi therapy.
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Affiliation(s)
- Qiaoya Lin
- Princess Margaret Cancer Center and Techna Institute, UHN, TMDT 5-362, 101 College Street, Toronto, ON, M5G 1L7, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada; Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science & Technology, Wuhan, 430074, China
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Huang C, Jin H, Qian Y, Qi S, Luo H, Luo Q, Zhang Z. Hybrid melittin cytolytic Peptide-driven ultrasmall lipid nanoparticles block melanoma growth in vivo. ACS NANO 2013; 7:5791-5800. [PMID: 23790040 DOI: 10.1021/nn400683s] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The cytolytic peptide melittin is a potential anticancer candidate that may be able to overcome tumor drug resistance due to its lytic properties. However, in vivo applications of melittin are limited due to its main side effect, hemolysis, which is especially pronounced following intravenous administration. Here, we designed a hybrid cytolytic peptide, α-melittin, in which the N-terminus of melittin is linked to the C-terminus of an amphipathic α-helical peptide (α-peptide) via a GSG linker. The strong α-helical configuration allows α-melittin to interact with phospholipids and self-assemble into lipid nanoparticles, with a high efficiency for α-melittin encapsulation (>80%) and a strong ability to control the structure of the nanoparticle (~20 nm). This α-melittin-based lipid nanoparticle (α-melittin-NP) efficiently shields the positive charge of melittin (18.70 ± 0.90 mV) within the phospholipid monolayer, resulting in the generation of a neutral nanoparticle (2.45 ± 0.56 mV) with reduced cytotoxicity and a widened safe dosage range. Confocal imaging data confirmed that α-melittin peptides were efficiently released from the nanoparticles and were cytotoxic to the melanoma cells. Finally, α-melittin-NPs were administered to melanoma-bearing mice via intravenous injection. The growth of the melanoma cells was blocked by the α-melittin-NPs, with an 82.8% inhibition rate relative to the PBS-treated control group. No side effects of treatment were found in this study. Thus, the excellent properties of α-melittin-NP give it potential clinical applications in solid tumor therapeutics through intravenous administration.
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Affiliation(s)
- Chuan Huang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan 430074, China
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Dermauw W, Wybouw N, Rombauts S, Menten B, Vontas J, Grbić M, Clark RM, Feyereisen R, Van Leeuwen T. A link between host plant adaptation and pesticide resistance in the polyphagous spider mite Tetranychus urticae. Proc Natl Acad Sci U S A 2013; 110:E113-22. [PMID: 23248300 PMCID: PMC3545796 DOI: 10.1073/pnas.1213214110] [Citation(s) in RCA: 258] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Plants produce a wide range of allelochemicals to defend against herbivore attack, and generalist herbivores have evolved mechanisms to avoid, sequester, or detoxify a broad spectrum of natural defense compounds. Successful arthropod pests have also developed resistance to diverse classes of pesticides and this adaptation is of critical importance to agriculture. To test whether mechanisms to overcome plant defenses predispose the development of pesticide resistance, we examined adaptation of the generalist two-spotted spider mite, Tetranychus urticae, to host plant transfer and pesticides. T. urticae is an extreme polyphagous pest with more than 1,100 documented hosts and has an extraordinary ability to develop pesticide resistance. When mites from a pesticide-susceptible strain propagated on bean were adapted to a challenging host (tomato), transcriptional responses increased over time with ~7.5% of genes differentially expressed after five generations. Whereas many genes with altered expression belonged to known detoxification families (like P450 monooxygenases), new gene families not previously associated with detoxification in other herbivores showed a striking response, including ring-splitting dioxygenase genes acquired by horizontal gene transfer. Strikingly, transcriptional profiles of tomato-adapted mites resembled those of multipesticide-resistant strains, and adaptation to tomato decreased the susceptibility to unrelated pesticide classes. Our findings suggest key roles for both an expanded environmental response gene repertoire and transcriptional regulation in the life history of generalist herbivores. They also support a model whereby selection for the ability to mount a broad response to the diverse defense chemistry of plants predisposes the evolution of pesticide resistance in generalists.
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Affiliation(s)
- Wannes Dermauw
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium
| | - Nicky Wybouw
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium
| | - Stephane Rombauts
- Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, B-9052 Ghent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium
| | - Björn Menten
- Center for Medical Genetics, Ghent University, B-9000 Ghent, Belgium
| | - John Vontas
- Faculty of Applied Biology and Biotechnology, Department of Biology, University of Crete, 71409 Heraklion, Greece
| | - Miodrag Grbić
- Department of Biology, University of Western Ontario, London N6A 5B7 ON, Canada
- Instituto de Ciencias de la Vid y del Vino Consejo Superior de Investigaciones Cientificas, Universidad de la Rioja, 26006 Logroño, Spain
| | - Richard M. Clark
- Department of Biology, University of Utah, Salt Lake City, UT 84112
- Center for Cell and Genome Science, University of Utah, Salt Lake City, UT 84112; and
| | - René Feyereisen
- Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique and Université de Nice Sophia Antipolis, 06903 Sophia Antipolis, France
| | - Thomas Van Leeuwen
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium
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Geninatti Crich S, Alberti D, Orio L, Stefania R, Longo D, Aime S. Lipid-Based Nanoparticles in Cardiovascular Molecular Imaging. CURRENT CARDIOVASCULAR IMAGING REPORTS 2012. [DOI: 10.1007/s12410-012-9180-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Jin H, Chen J, Lovell JF, Zhang Z, Zheng G. Synthesis and Development of Lipoprotein-Based Nanocarriers for Light-Activated Theranostics. Isr J Chem 2012. [DOI: 10.1002/ijch.201100054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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17
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Drug delivery via lipoprotein-based carriers: answering the challenges in systemic therapeutics. Ther Deliv 2012; 3:599-608. [PMID: 22834404 DOI: 10.4155/tde.12.41] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Plasma lipoproteins are transporters of lipids and other hydrophobic molecules in the mammalian circulation. Lipoproteins also have a strong potential to serve as drug-delivery vehicles due to their small size, long residence time in the circulation and high-drug payload. Consequently, lipoproteins and synthetic/reconstituted lipoprotein preparations have been evaluated with increasing interest towards clinical applications, particularly for cancer diagnostics/imaging and chemotherapy. In this review, past and current studies on lipoproteins and similar alternative drug carriers are discussed regarding their suitability as agents to deliver drugs, primarily to cancer cells and tumors. A lipoprotein-based delivery strategy may also provide a novel platform for improving the therapeutic efficacy of drugs that have previously been judged unsuitable or had only limited application due to poor solubility. An additional, and perhaps the most important aspect of the drug-delivery process via lipoprotein-type carriers, is the receptor-mediated uptake of the payload from the lipoprotein complex. Monitoring the expression of specific receptors prior to treatment could, thus, give rise to efficient selection of optimally responsive patients, resulting in a successful personalized therapy regimen.
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18
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Lin Q, Chen J, Jin H, Ng KK, Yang M, Cao W, Ding L, Zhang Z, Zheng G. Efficient systemic delivery of siRNA by using high-density lipoprotein-mimicking peptide lipid nanoparticles. Nanomedicine (Lond) 2012; 7:1813-25. [PMID: 22830501 DOI: 10.2217/nnm.12.73] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
UNLABELLED The main challenge for RNAi therapeutics lies in systemic delivery of siRNA to the correct tissues and transporting them into the cytoplasm of targeted cells, at safe, therapeutic levels. Recently, we developed a high-density lipoprotein-mimicking peptide-phospholipid scaffold (HPPS) and demonstrated its direct cytosolic delivery of siRNA in vitro, thereby bypassing endosomal trapping. AIM We investigate the in vivo implementation of HPPS for siRNA delivery. METHOD & RESULTS After systemic administration in KB tumor-bearing mice, HPPS prolonged the blood circulation time of cholesterol-modified siRNA (chol-siRNA) by a factor of four, improved its biodistribution and facilitated its uptake in scavenger receptor class B type I overexpressed tumors. For therapeutic targeting to the bcl-2 gene, the HPPS-chol-si-bcl-2 nanoparticles downregulated Bcl-2 protein, induced enhanced apoptosis (2.5-fold) in tumors when compared with controls (saline, HPPS, HPPS-chol-si-scramble and chol-si-bcl-2) and significantly inhibited tumor growth with no adverse effect. CONCLUSION HPPS is a safe, efficient nanocarrier for RNAi therapeutics in vivo.
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Affiliation(s)
- Qiaoya Lin
- Ontario Cancer Institute & Techna Institute, University Health Network, Toronto, ON, Canada
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19
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Abstract
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Over hundreds of millions of years, animals have evolved endogenous lipoprotein nanoparticles for shuttling hydrophobic molecules to different parts of the body. In the last 70 years, scientists have developed an understanding of lipoprotein function, often in relationship to lipid transport and heart disease. Such biocompatible, lipid–protein complexes are also ideal for loading and delivering cancer therapeutic and diagnostic agents, which means that lipoprotein and lipoprotein-inspired nanoparticles also offer opportunities for cancer theranostics. By mimicking the endogenous shape and structure of lipoproteins, the nanocarrier can remain in circulation for an extended period of time, while largely evading the reticuloendothelial cells in the body’s defenses. The small size (less than 30 nm) of the low-density (LDL) and high-density (HDL) classes of lipoproteins allows them to maneuver deeply into tumors. Furthermore, lipoproteins can be targeted to their endogenous receptors, when those are implicated in cancer, or to other cancer receptors. In this Account, we review the field of lipoprotein-inspired nanoparticles related to the delivery of cancer imaging and therapy agents. LDL has innate cancer targeting potential and has been used to incorporate diverse hydrophobic molecules and deliver them to tumors. Nature’s method of rerouting LDL in atherosclerosis provides a strategy to extend the cancer targeting potential of lipoproteins beyond its narrow purview. Although LDL has shown promise as a drug nanocarrier for cancer imaging and therapy, increasing evidence indicates that HDL, the smallest lipoprotein, may also be of use for drug targeting and uptake into cancer cells. We also discuss how synthetic HDL-like nanoparticles, which do not include human or recombinant proteins, can deliver molecules directly to the cytoplasm of certain cancer cells, effectively bypassing the endosomal compartment. This strategy could allow HDL-like nanoparticles to be used to deliver drugs that have increased activity in the cytoplasm. Lipoprotein nanoparticles have evolved to be ideal delivery vehicles, and because of that specialized function, they have the potential to improve cancer theranostics.
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Affiliation(s)
- Kenneth K. Ng
- Institute of Biomaterials and Biomedical Engineering, ‡Department of Medical Biophysics, and §Ontario Cancer Institute, University of Toronto, Ontario M5G 1L7, Canada
| | - Jonathan F. Lovell
- Institute of Biomaterials and Biomedical Engineering, ‡Department of Medical Biophysics, and §Ontario Cancer Institute, University of Toronto, Ontario M5G 1L7, Canada
| | - Gang Zheng
- Institute of Biomaterials and Biomedical Engineering, ‡Department of Medical Biophysics, and §Ontario Cancer Institute, University of Toronto, Ontario M5G 1L7, Canada
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20
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Tache A, Cotrone S, Litescu SC, Cioffi N, Torsi L, Sabbatini L, Radu GL. Spectrochemical Characterization of Thin Layers of Lipoprotein Self-Assembled Films on Solid Supports Under Oxidation Process. ANAL LETT 2011. [DOI: 10.1080/00032711003790098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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21
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Jin H, Lovell JF, Chen J, Ng K, Cao W, Ding L, Zhang Z, Zheng G. Cytosolic delivery of LDL nanoparticle cargo using photochemical internalization. Photochem Photobiol Sci 2011; 10:810-6. [DOI: 10.1039/c0pp00350f] [Citation(s) in RCA: 24] [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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22
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Zhang Z, Cao W, Jin H, Lovell J, Yang M, Ding L, Chen J, Corbin I, Luo Q, Zheng G. Biomimetic Nanocarrier for Direct Cytosolic Drug Delivery. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903112] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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23
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Zhang Z, Cao W, Jin H, Lovell J, Yang M, Ding L, Chen J, Corbin I, Luo Q, Zheng G. Biomimetic Nanocarrier for Direct Cytosolic Drug Delivery. Angew Chem Int Ed Engl 2009; 48:9171-5. [DOI: 10.1002/anie.200903112] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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24
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Cao W, Ng KK, Corbin I, Zhang Z, Ding L, Chen J, Zheng G. Synthesis and Evaluation of a Stable Bacteriochlorophyll-Analog and Its Incorporation into High-Density Lipoprotein Nanoparticles for Tumor Imaging. Bioconjug Chem 2009; 20:2023-31. [DOI: 10.1021/bc900404y] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Weiguo Cao
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Kenneth K. Ng
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Ian Corbin
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Zhihong Zhang
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Lili Ding
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Juan Chen
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
| | - Gang Zheng
- Department of Medical Biophysics, Ontario Cancer Institute, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada, Department of Chemistry, Shanghai University, China, and Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, China
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25
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Lacko AG, Nair M, Prokai L, McConathy WJ. Prospects and challenges of the development of lipoprotein-based formulations for anti-cancer drugs. Expert Opin Drug Deliv 2008; 4:665-75. [PMID: 17970668 DOI: 10.1517/17425247.4.6.665] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This review evaluates drug delivery systems that involve intact plasma lipoproteins or some of their components. These complex macromolecules transport highly water-insoluble compounds (cholesteryl esters and triacylglycerols) in their natural environment - a property that renders them ideal carriers of hydrophobic drugs. Particular emphasis is placed on the application of lipoproteins as drug delivery agents in cancer chemotherapy. The history and present activity regarding lipoprotein-based formulations are reviewed, with the primary focus on the smaller sized (low and high density) lipoprotein-based formulations and their potential clinical and commercial value. The use of both native and synthetic lipoproteins as drug delivery agents are discussed from the standpoint of therapeutic efficacy, as well as commercial feasibility. The advantages of lipoprotein-based drug delivery formulations are compared with other drug delivery models, with the primary focus on liposomal preparations. Finally, an expert opinion is provided, regarding the potential use of lipoprotein-based formulations in cancer treatment, taking into consideration the major advantages (biocompatibility, safety, drug solubility) and the barriers (manufacturing protein components, financial interest, investments) to their commercial development.
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Affiliation(s)
- Andras G Lacko
- University of North Texas Health Science Center, Department of Molecular Biology and Immunology, 3500 Camp Bowie Blvd, Fort Worth, TX 76107, USA.
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26
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Jones C, Garuti R, Michaely P, Li WP, Maeda N, Cohen JC, Herz J, Hobbs HH. Disruption of LDL but not VLDL clearance in autosomal recessive hypercholesterolemia. J Clin Invest 2007; 117:165-74. [PMID: 17200716 PMCID: PMC1716209 DOI: 10.1172/jci29415] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Accepted: 10/10/2006] [Indexed: 11/17/2022] Open
Abstract
Genetic defects in LDL clearance result in severe hypercholesterolemia and premature atherosclerosis. Mutations in the LDL receptor (LDLR) cause familial hypercholesterolemia (FH), the most severe form of genetic hypercholesterolemia. A phenocopy of FH, autosomal recessive hypercholesterolemia (ARH), is due to mutations in an adaptor protein involved in LDLR internalization. Despite comparable reductions in LDL clearance rates, plasma LDL levels are substantially lower in ARH than in FH. To determine the metabolic basis for this difference, we examined the synthesis and catabolism of VLDL in murine models of FH (Ldlr(-/-)) and ARH (Arh(-/-)). The hyperlipidemic response to a high-sucrose diet was greatly attenuated in Arh(-/-) mice compared with Ldlr(-/-) mice despite similar rates of VLDL secretion. The rate of VLDL clearance was significantly higher in Arh(-/-) mice than in Ldlr(-/-) mice, suggesting that LDLR-dependent uptake of VLDL is maintained in the absence of ARH. Consistent with these findings, hepatocytes from Arh(-/-) mice (but not Ldlr(-/-) mice) internalized beta-migrating VLDL (beta-VLDL). These results demonstrate that ARH is not required for LDLR-dependent uptake of VLDL by the liver. The preservation of VLDL remnant clearance attenuates the phenotype of ARH and likely contributes to greater responsiveness to statins in ARH compared with FH.
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Affiliation(s)
- Christopher Jones
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Rita Garuti
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Peter Michaely
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Wei-Ping Li
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Nobuyo Maeda
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Jonathan C. Cohen
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Joachim Herz
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Helen H. Hobbs
- Department of Molecular Genetics and
Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Center for Human Nutrition and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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27
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Lacko AG, Nair M, Paranjape S, Mooberry L, McConathy WJ. Trojan horse meets magic bullet to spawn a novel, highly effective drug delivery model. Chemotherapy 2006; 52:171-3. [PMID: 16691026 DOI: 10.1159/000093268] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2005] [Accepted: 09/06/2005] [Indexed: 11/19/2022]
Abstract
Because of their physicochemical properties and the selective receptor-mediated uptake of their core components, reconstituted high-density lipoproteins have unique advantages over conventional formulations to serve as targeted drug delivery agents.
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Affiliation(s)
- Andras G Lacko
- University of North Texas Health Science Center, Fort Worth, Tex. 76107-2699, USA.
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28
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Li H, Gray BD, Corbin I, Lebherz C, Choi H, Lund-Katz S, Wilson JM, Glickson JD, Zhou R. MR and fluorescent imaging of low-density lipoprotein receptors. Acad Radiol 2004; 11:1251-9. [PMID: 15561572 DOI: 10.1016/j.acra.2004.08.007] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2004] [Revised: 07/22/2004] [Accepted: 08/12/2004] [Indexed: 01/08/2023]
Abstract
RATIONALE AND OBJECTIVES Over-expression of low-density lipoprotein receptors (LDLRs) occurs in many types of malignancies and is related to the requirement for lipids for rapid proliferation of the tumors. On the other hand, LDLRs that are unable to bind LDL are found on hepatocytes of patients with familial hypercholesterolemia (FH), a genetic disease that leads to premature atherosclerosis and death. The highly selective binding of LDL to LDLR makes these particles ideal carriers of therapeutic and diagnostic contrast agents into the targeted cells. The objectives of this paper are to examine whether a prototype contrast agent (PTIR267) with dual detection properties is suitable for labeling of LDL particles for in vivo detection of LDLR by magnetic resonance imaging (MRI) and for in vitro monitoring of cellular localization by confocal fluorescence microscopy. MATERIALS AND METHODS PTIR267 is a lipophilic GdDTPA derivative conjugated to a fluorescent dye. The conjugated dye molecule makes the probe sufficiently water soluble to allow labeling of LDL by a brief incubation of LDL with PTIR267 dissolved in PBS at 37 degrees C (mole ratio LDL: PTIR267 = 0.09:1). The molar relaxivity of PTIR267 in saline is 26 mM(-1)s(-1). Specific LDLR-mediated uptake of PTIR267-labeled LDL was demonstrated in vitro by confocal fluorescence imaging of B16 melanoma cells using confocal fluorescence imaging. In vivo uptake of PTIR267-labeled LDL by a subcutaneously implanted B16 melanoma in mice leads to 30% decrease in longitudinal relaxation time (T(1)) in the tumor. In vivo uptake of PTIR267-labeled LDL leads to 70% decrease in T(1) in a normal C57BL/6 mouse liver; however, in the liver of LDL receptor gene knockout (LDLr-/-) mice with C57BL/6 background, only 12% decrease in T(1) is observed. CONCLUSIONS The dual fluorescence and MR imaging properties of PTIR267, combined with the ease of LDL labeling, suggest that it will be a useful tool for optimization of LDLR-targeted cancer diagnosis or therapy and for monitoring the efficacy of gene therapy of FH.
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Affiliation(s)
- Hui Li
- Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA
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Hammel M, Laggner P, Prassl R. Structural characterisation of nucleoside loaded low density lipoprotein as a main criterion for the applicability as drug delivery system. Chem Phys Lipids 2003; 123:193-207. [PMID: 12691852 DOI: 10.1016/s0009-3084(03)00002-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The potential role of human low density lipoprotein (LDL) particles as delivery system for lipophilic, cytotoxic drugs critically depends on their structural integrity. In the present study, LDL particles were loaded with antineoplastic prodrugs, i.e. monooleoyl (MOT)- and dioleoyl (DOT)- thymidine esters by different techniques. Using the reconstitution method MOT shows the highest incorporation efficiency with over 80% of the initial drug associated with LDL. In contrast, for the more lipophilic DOT the incorporation efficiency for reconstitution, dry film as well as dimethylsulfoxide method was extremely low. Structural changes upon drug loading were monitored by differential scanning calorimetry (DSC) and small angle X-ray scattering (SAXS). The results show that the influence of MOT and DOT is predominantly confined to the surface monolayer of LDL seen as a destabilisation of the protein moiety and a small increase in particle diameter. The core lipid region of the LDL-drug complexes remains essentially unaffected, as verified by undisturbed core lipid arrangement and core lipid melting behaviour.
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Affiliation(s)
- Michal Hammel
- Institute of Biophysics and X-Ray Structure Research, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042, Graz, Austria
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30
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Lo EHK, Ooi VEL, Fung KP. Circumvention of multidrug resistance and reduction of cardiotoxicity of doxorubicin in vivo by coupling it with low density lipoprotein. Life Sci 2002; 72:677-87. [PMID: 12467908 DOI: 10.1016/s0024-3205(02)02180-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Doxorubicin (Dox) was coupled into human low density lipoprotein (LDL) to form a complex LDL-Dox. In in vitro studies, the accumulation of LDL-Dox in human resistant hepatoma (R-HepG2) cells was found to be higher than that of free Dox in the cells, resulting in an increase of the cytotoxic effect on the cells. Moreover, in in vivo studies, under the same dosage of drugs (1 mg/kg), the anti-proliferative effect on the tumor cells of LDL-Dox in nude mice bearing R-HepG2 cells was higher than that of free Dox as evidenced by the larger reduction in tumor volumes and tumor weights in LDL-Dox treated group. Histological studies showed that LDL-Dox treatment did not cause any heart damage when compared with the control group. In contrast, Dox treatment caused disruption and vacuolization of myocardial filament. Plasma lactate dehydrogenase activity and plasma creatine kinase activity in nude mice bearing R-HepG2 cells were found to be elevated in the Dox-treated group but remained unchanged in LDL-Dox-treated group. The present studies indicate that when Dox is coupled with LDL, the multidrug resistance can be circumvented and the cardiotoxicity can be reduced.
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MESH Headings
- Animals
- Antineoplastic Agents/adverse effects
- Antineoplastic Agents/metabolism
- Antineoplastic Agents/pharmacology
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/pathology
- Cell Survival/drug effects
- Creatine Kinase/blood
- Doxorubicin/adverse effects
- Doxorubicin/metabolism
- Doxorubicin/pharmacology
- Drug Carriers/administration & dosage
- Drug Carriers/pharmacology
- Drug Resistance, Multiple
- Drug Resistance, Neoplasm
- Drug Screening Assays, Antitumor
- Heart/drug effects
- Humans
- L-Lactate Dehydrogenase/blood
- Lipoproteins, LDL/administration & dosage
- Lipoproteins, LDL/metabolism
- Lipoproteins, LDL/pharmacology
- Mice
- Mice, Nude
- Myocardium/pathology
- Neoplasm Transplantation
- Neoplasms, Experimental/blood
- Neoplasms, Experimental/drug therapy
- Tumor Cells, Cultured/drug effects
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Affiliation(s)
- Elka H K Lo
- Department of Biochemistry, The Chinese University of Hong Kong, Shatin, N.T., China
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Rawson RB, DeBose-Boyd R, Goldstein JL, Brown MS. Failure to Cleave Sterol Regulatory Element-binding Proteins (SREBPs) Causes Cholesterol Auxotrophy in Chinese Hamster Ovary Cells with Genetic Absence of SREBP Cleavage-activating Protein. J Biol Chem 1999; 274:28549-56. [PMID: 10497220 DOI: 10.1074/jbc.274.40.28549] [Citation(s) in RCA: 145] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We describe a line of mutant Chinese hamster ovary cells, designated SRD-13A, that cannot cleave sterol regulatory element-binding proteins (SREBPs) at site 1, due to mutations in the gene encoding SREBP cleavage-activating protein (SCAP). The SRD-13A cells were obtained by two rounds of gamma-irradiation followed first by selection for a deficiency of low density lipoprotein receptors and second for cholesterol auxotrophy. In the SRD-13A cells, the only detectable SCAP allele encodes a truncated nonfunctional protein. In the absence of SCAP, the site 1 protease fails to cleave SREBPs, and their transcriptionally active NH(2)-terminal fragments cannot enter the nucleus. As a result, the cells manifest a marked reduction in the synthesis of cholesterol and its uptake from low density lipoproteins. The SRD-13A cells grow only when cholesterol is added to the culture medium. SREBP cleavage is restored and the cholesterol requirement is abolished when SRD-13A cells are transfected with expression vectors encoding SCAP. These results provide formal proof that SCAP is essential for the cleavage of SREBPs at site 1.
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Affiliation(s)
- R B Rawson
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
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32
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Rawson RB, Cheng D, Brown MS, Goldstein JL. Isolation of cholesterol-requiring mutant Chinese hamster ovary cells with defects in cleavage of sterol regulatory element-binding proteins at site 1. J Biol Chem 1998; 273:28261-9. [PMID: 9774448 DOI: 10.1074/jbc.273.43.28261] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The synthesis and uptake of cholesterol requires transcription factors designated sterol regulatory element-binding proteins (SREBPs). SREBPs are bound to membranes in a hairpin orientation with their transcriptionally active NH2-terminal segments facing the cytosol. The NH2-terminal segments are released from membranes by two-step proteolysis initiated by site 1 protease (S1P), which cleaves in the luminal loop between two membrane-spanning segments. Next, site 2 protease (S2P) releases the NH2-terminal fragment of SREBP. The S2P gene was recently isolated by complementation cloning using Chinese hamster ovary cells that require cholesterol for growth, due to a mutation in the S2P gene. A similar approach cannot be used for S1P because all previous cholesterol auxotrophs manifest defects in S2P, which is encoded by a single copy gene. To circumvent this problem, in the current studies we transfected Chinese hamster ovary cells with the S2P cDNA, assuring multiple copies. We mutagenized the cells, selected for cholesterol auxotrophy, and identified two mutant cell lines (SRD-12A and -12B) that fail to cleave SREBPs at site 1. Complementation analysis demonstrated that the defects in both cell lines are recessive and noncomplementing, indicating a mutation in the same gene. These cells should now be useful for expression cloning of the sterol-regulated S1P gene.
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Affiliation(s)
- R B Rawson
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
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Pai JT, Guryev O, Brown MS, Goldstein JL. Differential stimulation of cholesterol and unsaturated fatty acid biosynthesis in cells expressing individual nuclear sterol regulatory element-binding proteins. J Biol Chem 1998; 273:26138-48. [PMID: 9748295 DOI: 10.1074/jbc.273.40.26138] [Citation(s) in RCA: 170] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Three sterol regulatory element-binding proteins (SREBP-1a, -1c, and -2) stimulate transcription of genes involved in synthesis and receptor-mediated uptake of cholesterol and fatty acids. Here, we explore the individual roles of each SREBP by preparing lines of Chinese hamster ovary (CHO) cells that express graded amounts of nuclear forms of each SREBP (designated nSREBPs) under control of a muristerone-inducible nuclear receptor system. The parental hamster cell line (M19 cells) lacks its own nSREBPs, owing to a deletion in the gene encoding the Site-2 protease, which releases nSREBPs from cell membranes. By varying the concentration of muristerone, we obtained graded expression of individual nSREBPs in the range that restored lipid synthesis to near physiologic levels. The results show that nSREBP-2 produces a higher ratio of synthesis of cholesterol over fatty acids than does nSREBP-1a. This is due in part to a selective ability of low levels of nSREBP-2, but not nSREBP-1a, to activate the promoter for squalene synthase. nSREBP-1a and -2 both activate transcription of the genes encoding stearoyl-CoA desaturase-1 and -2, thereby markedly enhancing the production of monounsaturated fatty acids. nSREBP-1c was inactive in stimulating any transcription at the concentrations achieved in these studies. The current data support the emerging view that the nSREBPs act in complementary ways to modulate the lipid composition of cell membranes.
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Affiliation(s)
- J T Pai
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
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Lusa S, Tanhuanpää K, Ezra T, Somerharju P. Direct observation of lipoprotein cholesterol ester degradation in lysosomes. Biochem J 1998; 332 ( Pt 2):451-7. [PMID: 9601074 PMCID: PMC1219500 DOI: 10.1042/bj3320451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We have investigated whether pyrene-labelled cholesterol esters (PyrnCEs) (n indicates the number of aliphatic carbons in the pyrene-chain) can be used to observe the degradation of low-density lipoprotein (LDL)-derived cholesterol esters (CEs) in the lysosomes of living cells. To select the optimal substrates, hydrolysis of the PyrnCE species by lysosomal acid lipase (LAL) in detergent/phospholipid micelles was compared. The rate of hydrolysis varied markedly depending on the length of the pyrenyl chain. Pyr10CE was clearly the best substrate, while Pyr4CE was practically unhydrolysed. Pyr10CE and [3H]cholesteryl linoleate, the major CE species in LDL, were hydrolysed equally by LAL when incorporated together into reconstituted LDL (rLDL) particles, thus indicating that Pyr10CE is a reliable reporter of the lysosomal degradation of native CEs. When rLDL particles containing Pyr4CE or Pyr10CE were incubated with fibroblasts, the accumulation of bright intracellular vesicular fluorescence was observed with the former fluorescent derivative, but not with the latter. However, when the cells were treated with chloroquine, an inhibitor of lysosomal hydrolysis, or when cells with defective LAL were employed, Pyr10CE also accumulated in vesicular structures. HPLC analysis of cellular lipid extracts fully supported these imaging results. It is concluded that PyrnCEs can be used to observe degradation of CEs directly in living cells. This should be particularly useful when exploring the mechanisms responsible for the accumulation of lipoprotein-derived CEs in complex systems such as the arterial intima.
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Affiliation(s)
- S Lusa
- Institute of Biomedicine, Department of Medical Chemistry, Siltavuorenpenger 10A, P.O. Box 8, 00014 University of Helsinki, Helsinki, Finland
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Acton S, Rigotti A, Landschulz KT, Xu S, Hobbs HH, Krieger M. Identification of scavenger receptor SR-BI as a high density lipoprotein receptor. Science 1996; 271:518-20. [PMID: 8560269 DOI: 10.1126/science.271.5248.518] [Citation(s) in RCA: 1744] [Impact Index Per Article: 62.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
High density lipoprotein (HDL) and low density lipoprotein (LDL) are cholesterol transport particles whose plasma concentrations are directly (LDL) and inversely (HDL) correlated with risk for atherosclerosis. LDL catabolism involves cellular uptake and degradation of the entire particle by a well-characterized receptor. HDL, in contrast, selectively delivers its cholesterol, but not protein, to cells by unknown receptors. Here it is shown that the class B scavenger receptor SR-BI is an HDL receptor. SR-BI binds HDL with high affinity, is expressed primarily in liver and nonplacental steroidogenic tissues, and mediates selective cholesterol uptake by a mechanism distinct from the classic LDL receptor pathway.
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Affiliation(s)
- S Acton
- Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA
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36
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Acton S, Scherer P, Lodish H, Krieger M. Expression cloning of SR-BI, a CD36-related class B scavenger receptor. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)31921-x] [Citation(s) in RCA: 630] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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37
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Rip JW, Blais MM, Jiang LW. Low-density lipoprotein as a transporter of dolichol intermediates in the mammalian circulation. Biochem J 1994; 297 ( Pt 2):321-5. [PMID: 8297338 PMCID: PMC1137832 DOI: 10.1042/bj2970321] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The cholesteryl esters which make up the bulk of the core of the human low-density lipoprotein particle were removed by extraction into heptane and replaced with the fluorescent anthroyl or N-(7-nitrobenzyl-2-oxa-1,3-diazol-4-yl)aminohexanoyl esters of dolichol. The reconstituted low-density lipoproteins were efficiently internalized by normocholesterolaemic human fibroblasts but not by fibroblasts from patients lacking the low-density-lipoprotein receptor, or lacking the ability to internalize the receptor-lipoprotein complex. In normal fibroblasts, the reconstituted low-density lipoproteins were delivered to lysosomes after internalization. The results suggest that (i) dolichol intermediates in the human circulation are normally carried on low-density lipoproteins and (ii) that low-density lipoproteins are involved in the accumulation of dolichol intermediates in lysosomes during normal human aging and in certain diseases involving the lysosome. In addition, by incorporating these very hydrophobic probes into low-density lipoprotein, they can be presented to cells in culture at high concentration in a water-soluble form.
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Affiliation(s)
- J W Rip
- Department of Biochemistry, University of Western Ontario, London, Canada
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Samadi-Baboli M, Favre G, Canal P, Soula G. Low density lipoprotein for cytotoxic drug targeting: improved activity of elliptinium derivative against B16 melanoma in mice. Br J Cancer 1993; 68:319-26. [PMID: 8347487 PMCID: PMC1968583 DOI: 10.1038/bjc.1993.335] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Significant low density lipoprotein (LDL) uptake by tumour cells led to the use of LDL as a discriminatory vehicle for the delivery of cytotoxic drugs. In the current study, the lipophilic elliptinium derivative, elliptinium-oleate (OL-NME), was incorporated into LDL to reach an incorporation level of 400 molecules per LDL particle. The OL-NME-LDL complex showed cytotoxic effects on normal human fibroblasts while the cytotoxicity was not observed on receptor-defective human fibroblasts, indicating the ability of the complex to be preferentially metabolised by the LDL receptor. In vivo metabolism of the complex was related to the LDL receptor pathway. The metabolic clearance was the same for native LDL (17.1 ml h-1) and OL-NME-LDL complex (16.2 ml h-1). LDL incorporated OL-NME enhanced the anti-tumour activity against murine B16 melanoma model; this resulted from increased efficacy for OL-NME-LDL at doses equal to free 9-OH-NME (157 vs 76 of Increase Life Span (ILS) (%) values after intraperitoneal (i.p.) drug injection on i.p. implanted tumour model and 45 vs -2 ILS (%) values after intravenous drug injection on subcutaneous implanted tumour model). These data suggest that LDL improves the potency of lipophilic cytotoxic drugs against tumours that express LDL receptor activity.
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Affiliation(s)
- M Samadi-Baboli
- Department of Drug Targeting Research, Faculty of Pharmaceutical Sciences, Paul Sabatier University, Toulouse, France
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Atwal OS, Singh B, Staempfli H, Minhas K. Presence of pulmonary intravascular macrophages in the equine lung: some structuro-functional properties. Anat Rec (Hoboken) 1992; 234:530-40. [PMID: 1456455 DOI: 10.1002/ar.1092340408] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The pulmonary intravascular macrophages (PIMs) have been described in several species of animals. This study demonstrates for the first time that the equine lung has PIMs as resident phagocytes in its microvasculature. Their salient features such as globular surface coat, structures of the endocytic pathway, and related cell organelles closely resemble those of the calf, goat, and sheep. The exquisite organization of the coat globules in the form of a linear chain was structurally similar to the lipolytic lipase and the heparin-sensitive globular coat from PIMs of calf, goat, and sheep. Monastral blue (MB) when employed as a tracer to assess the phagocytic properties of equine PIMs induced similar modification of the globules of the coat into lipid droplets, reminiscent of neutral lipids. Lipids droplets (modified coat globules) were delivered into acid phosphatase-positive endosomes and lysosomes. Concurrently, the unaltered globules of the coat, probably internalized via fluid-phase constitutive pinocytoses, followed a different endocytic pathway. Large-scale platelet uptake by the PIMs was observed with thrombocytopenia in MB-treated ponies. The possible significance of hypothetical LDL-coat and the endocytic organelles as equivalents of synthetic apparatus of vasoactive lipids in the PIMs of horse needs to be assessed in future studies.
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Affiliation(s)
- O S Atwal
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Canada
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40
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Deforge LE, Degalan MR, Ruyan MK, Newton RS, Counsell RE. Comparison of methods for incorporating a radioiodinated residualizing cholesteryl ester analog into low density lipoprotein. INTERNATIONAL JOURNAL OF RADIATION APPLICATIONS AND INSTRUMENTATION. PART B, NUCLEAR MEDICINE AND BIOLOGY 1992; 19:775-82. [PMID: 1399699 DOI: 10.1016/0883-2897(92)90139-p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Two different methods were evaluated for incorporating [125I]cholesteryl iopanoate ([125I]CI), a non-hydrolyzable cholesteryl ester analog, into LDL. The first procedure was an organic solvent delipidation-reconstitution procedure (R[125I-CI]LDL) while the second involved incubation of detergent (Tween-20)-solubilized [125I]CI with whole plasma (D[125I-CI]LDL). R[125I-CI]LDL behaved similar to native LDL in vitro, but was markedly different in vivo, apparently due to a heterogeneity in particle size. D[125I-CI]LDL, however, was metabolized normally both in vitro and in vivo. These results, combined with the residualizing nature of [125I]CI, demonstrate that D[125I-CI]LDL is appropriate for tracing LDL uptake in vivo.
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Affiliation(s)
- L E Deforge
- Department of Pharmacology, University of Michigan, Ann Arbor 48109
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41
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Atwal OS, Minhas KJ, Gill BS, Sandhu PS. In vivo monastral blue-induced lamellar-bodies in lysosomes of pulmonary intravascular macrophages (PIMs) of bovine lung: implications of the surface coat. Anat Rec (Hoboken) 1992; 234:223-39. [PMID: 1416108 DOI: 10.1002/ar.1092340209] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We previously reported that the pulmonary intravascular macrophages (PIMs) of sheep, goat, and calf lung contained a heparin and a lipolytic lipase sensitive surface coat by using tannic acid as a component of paraformaldehyde-glutaraldehyde-based fixative. The implication of this sensitivity was that the surface coat was predominantly comprised of lipoprotein-like substance. In this study we report that monastral blue (MB) used as a vascular tracer interacted with the coat globules and lost its original particulate appearance. Its precise localization in the PIMs was in combination with altered macromolecules of the surface coat in the form of lipid droplets, which conformed to the conventional view of neutral lipids. In contrast, pigment particles examined in their native state resembled metallic particles as electron-dense elliptical rods. The lipid droplets were subsequently internalized through endocytic route and found their access into the lysosomal compartments of PIMs at the electron microscopic level. Lamellar bodies (LLBs) arose from the lysosomal matrix after the entry of lipid droplets in the secondary lysosomes. Acid phosphatase activity was located in secondary lysosomes as well as in endosomes. These observations suggest that coat granules of the PIMs acted as a carrier of exogenous MB particles to deliver the complex to the lysosomal compartment where partial digestion lead to the formation of lamellar bodies. The implications of MB (cationic dye) as a vascular tracer for studying phagocytic index of PIMs in the light of their coat and the rapid development of LLBs are discussed. It is proposed that MB by initially combining with the surface coat provokes mobilization of intracellular lipid pools. In this way metabolism of vasoactive lipid in the PIMs is stimulated to influence the dynamics of pulmonary circulation in the calves.
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Affiliation(s)
- O S Atwal
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Canada
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42
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Agmon V, Dinur T, Cherbu S, Dagan A, Gatt S. Administration of pyrene lipids by receptor-mediated endocytosis and their degradation in skin fibroblasts. Exp Cell Res 1991; 196:151-7. [PMID: 1654269 DOI: 10.1016/0014-4827(91)90244-o] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Sphingomyelin and seven glycosphingolipids were labeled with the fluorescent probe pyrene and administered into cultured fibroblasts by receptor-mediated endocytosis. For this purpose pyrene sphingomyelin or mixtures of pyrene glycolipid and unlabeled sphingomyelin were dispersed as small, unilamellar liposomes. Apolipoprotein E was then added and the receptor for this ligand on the cell surface was utilized for uptake of the liposomes and their transport to the lysosomes, where the respective pyrene lipids were degraded. Following incubation with each of the respective pyrene lipids, only the administered compound and the pyrene ceramide were present; intermediate hydrolysis products were not detected. This indicated that, in skin fibroblasts, the lysosomal ceramidase was limiting and controlled the rate of total degradation of the pyrene sphingolipids.
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Affiliation(s)
- V Agmon
- Department of Membrane Biochemistry and Neurochemistry, Hebrew University, Hadassah School of Medicine, Jerusalem, Israel
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43
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Crawford JM, Braunwald NS. Toxicity in vital fluorescence microscopy: effect of dimethylsulfoxide, rhodamine-123, and DiI-low density lipoprotein on fibroblast growth in vitro. IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY : JOURNAL OF THE TISSUE CULTURE ASSOCIATION 1991; 27A:633-8. [PMID: 1917780 DOI: 10.1007/bf02631106] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Fluorescence microscopy performed on living cells is a valuable technique for elucidating patterns of cell growth in vitro over artificial biomaterials such as vascular grafts, and for in vivo studies such as identification and treatment of atherosclerotic plaques. Two fluorescent dyes of particular value for vital fluorescence studies are Rhodamine-123 and 3,3'-dioctadecylindocarbocyanine-labeled low density lipoprotein (DiI-LDL). We examined the toxicity of these two dyes and of dimethylsulfoxide (DMSO), a solvent used in Rhodamine-123 studies, on the growth of MRC5 human fetal fibroblasts in monolayer culture. Two parameters of cell growth were quantitated: Cell number (a measure of proliferation), and cell area (a measure of cell spreading), based on microscopic images obtained at the start and end of a 48-h growth period after brief exposure (0.5 h) to test solutions. We found that the recommended solvent for solubilization of Rhodamine-123, DMSO, caused cessation of cell proliferation and actual reduction in the area covered by adherent fibroblasts at concentrations of as low as 0.1% (vol:vol). Rhodamine-123 made up from an aqueous stock solution modestly retarded proliferation and spreading, and there was no significant effect of DiI-LDL on these parameters over prolonged periods of exposure (up to 24 h) in culture. These results demonstrate that the most toxic substance for growing fibroblasts was the solvent DMSO. We conclude that both the solvent vehicle and fluorescent dye should be carefully examined for potential toxicity before such dyes are used for vital fluorescence studies of living cells.
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Affiliation(s)
- J M Crawford
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts 02115
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44
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Niendorf A, Beisiegel U. Low-density lipoprotein receptors. CURRENT TOPICS IN PATHOLOGY. ERGEBNISSE DER PATHOLOGIE 1991; 83:187-218. [PMID: 2007335 DOI: 10.1007/978-3-642-75515-6_8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Koren E, Franzen J, Fugate RD, Alaupovic P. Analysis of cholesterol ester accumulation in macrophages by the use of digital imaging fluorescence microscopy. Atherosclerosis 1990; 85:175-84. [PMID: 2102081 DOI: 10.1016/0021-9150(90)90109-v] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Low density lipoprotein (LDL) induced accumulation of cholesterol esters was analyzed by the digital imaging fluorescence microscopy (DIFM) in murine tumor macrophages. To analyze cholesterol ester accumulation, P388D1 macrophages were incubated with increasing quantities of unmodified or acetylated human LDL, washed, and live stained with a lipophylic fluorescent dye Nile Red. The increase in fluorescence intensity was quantitatively determined by the interactive laser cytometer (ACAS 470) and compared with the accumulation of cellular cholesterol esters determined by the gas liquid chromatography. Correlation between the two methods was highly significant (r greater than 0.9, P less than 0.001). A good agreement between the two methods was also found in terms of sensitivity and reproducibility. With the use of 589 nm narrowband interference filter in the light path of emitted light the intensity of fluorescence correlated well with cellular cholesterol ester content even in the presence of relatively high concentrations of triglycerides. Therefore, digital imaging fluorescence microscopy appears to be a reliable method for quantification of cholesterol ester accumulation at the single cell level offering new possibilities of studying interactions between cells and cholesterol ester rich lipoproteins.
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Affiliation(s)
- E Koren
- Oklahoma Medical Research Foundation, Oklahoma City 73104
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46
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Vitols S, Söderberg-Reid K, Masquelier M, Sjöström B, Peterson C. Low density lipoprotein for delivery of a water-insoluble alkylating agent to malignant cells. In vitro and in vivo studies of a drug-lipoprotein complex. Br J Cancer 1990; 62:724-9. [PMID: 2245164 PMCID: PMC1971505 DOI: 10.1038/bjc.1990.367] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Previous studies have shown that human leukaemic cells and certain tumour tissues have a higher receptor-mediated uptake of low density lipoprotein (LDL) than the corresponding normal cells or tissues. LDL has therefore been proposed as a carrier for anti-cancer agents. In the current study, a water-insoluble mitoclomine derivative (WB 4291) was incorporated into LDL. The WB 4291-LDL complex contained about 1,500 drug molecules per LDL particle and showed receptor-mediated toxicity in vitro as judged from the difference in growth inhibitory effect on normal and mutant (LDL-receptor-negative) cultured Chinese hamster ovary cells. However, cellular drug uptake did not exclusively occur by the receptor pathway since mutant cells were also affected to some extent. The LDL part of the complex had the same plasma clearance and organ distribution as native LDL after i.v. injection in mice and rabbits. Therapeutic effects were observed when Balb-C mice with experimental leukaemia were treated with the complex. After i.p. administration to mice with i.p. leukaemia median survival time was prolonged 2.5-fold and 40% became long time survivors. The effect was weaker (42% increase in life span) after i.v. injections of the complex to mice with i.v. leukaemia.
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Affiliation(s)
- S Vitols
- Department of Clinical Pharmacology, Karolinska Hospital, Stockholm, Sweden
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47
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48
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Benhamamouch S, Kuznierz JP, Agnani G, Marzin D, Lecerf JM, Fruchart JC, Clavey V. Determination of the LDL receptor binding capacity of human lymphocytes by immunocytofluorimetric assay. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 1002:45-53. [PMID: 2493806 DOI: 10.1016/0005-2760(89)90062-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The determination of the LDL receptor binding capacity of human blood lymphocytes was assessed by indirect immunocytofluorimetric assay. To produce the maximal synthesis of the LDL receptor, the cholesterol efflux was enhanced by incubation of lymphocytes with HDL3 subfractions. The binding capacity of the LDL receptor was measured by incubation at 4 degrees C either with LDL and rabbit anti-LDL immunoglobulins or with peptide receptor antibody (ARP-Ig) raised against the NH2-terminal sequence of the LDL receptor. Thereafter complexes were incubated with fluorescein-labelled anti-rabbit immunoglobulin (FITC-Ig). Fluorescence flow cytometry was used to quantify the number of fluorescent lymphocytes and results were expressed as the percentage of lymphocytes with a fluorescent intensity above the threshold. Using preimmune rabbit immunoglobulin and then FITC-Ig, only 5-10% of cells were fluorescent. Neither LDL nor ARP-Ig could bind to homozygous familial hypercholesterolemia (FH) lymphocytes. Normal lymphocytes preincubated with HDL3 could bind LDL or ARP-Ig, the number of fluorescent cells being 59 and 39.2% respectively. Subjects with confirmed or suspected heterozygous FH demonstrated cell fluorescence at about half the normal level.
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49
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Kao YJ, Doody MC, Smith LC. Transfer of cholesterol and a fluorescent cholesterol analog, 3'-pyrenylmethyl-23,24-dinor-5-cholen-22-oate-3 beta-ol, between human plasma high density lipoproteins. J Lipid Res 1988. [DOI: 10.1016/s0022-2275(20)38801-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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50
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Leonard S, Sinensky M. Somatic cell genetics and the study of cholesterol metabolism. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 947:101-12. [PMID: 3278736 DOI: 10.1016/0304-4157(88)90021-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The regulation of cholesterol biosynthesis by extracellular cholesterol occurs both in whole animal tissue and in permanent somatic cell lines in culture. Permanent mammalian cells lines, under optimized growth conditions, are easily manipulated both biochemically and genetically. The Chinese hamster ovary cell line (CHO-K1) is the most widely used cell line for genetic studies. CHO-K1 is a pseudo-diploid mammalian cell exhibiting a short doubling time and a relatively high plating efficiency. Somatic cell mutants can be generated through mutagenesis and also by drug adaptation. Following mutagenesis, auxotrophs may be isolated either by selection or by screening. Most selection procedures for mutants of cholesterol metabolism must be done in serum depleted of cholesterol which requires the endogenous biosynthetic pathway to be intact. Mutants failing to produce cholesterol do not replicate their DNA and exhibit reduced concentrations of cholesterol in their membranes. BUdR and polyene antibiotics have both been used to select against the wild-type cells which incorporate these compounds and are killed, allowing the survival of the mutant cells. Both mevalonate and cholesterol auxotrophs have been isolated with the BUdR technique and have proven useful for elucidation of the early steps in cholesterol biosynthesis, particularly for the ratelimiting enzyme HMG-CoA reductase. Somatic cell fusion of a mutant and wild-type cell followed by chromosomal segregation, routinely used to map human genes, has also been used to map the human gene for HMG-CoA synthase. Such hybrids also provide valuable information on the dominance or recessivity of a specific lesion. DNA-mediated gene transfer into somatic cell mutants allows the selection of DNA sequences which complement the mutation, and is also useful for analysis of regions of regulatory significance. Mutants, resistant to the regulatory effects of oxygenated sterols, can be isolated following mutagenesis. Mutants of this type vary the lipid content of their membranes in response to cholesterol concentration in the medium. All such mutants tested exhibit a pleiotropic regulatory effect on more than one enzyme in the cholesterol biosynthetic pathway. Adaptation to drugs such as compactin and mevinolin, which inhibit HMG-CoA reductase, have been used to produce mutants which overexpress enzymes in the pathway. These amplified cells are useful sources of specific mRNAs for construction of cDNA libraries and gene isolation. Structure-function relationships of membrane sterols can be studied in cholesterol auxotrophs where changes in acyl-chain ordering can be manipulated by exogenous sterols in the medium.
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Affiliation(s)
- S Leonard
- Eleanor Roosevelt Institute for Cancer Research, Denver, CO 80206
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