1
|
Wang X, Yuan K, Su Y, Li X, Meng L, Zhao N, Hu Y, Duan F, Xu FJ. Tuning Blood-Material Interactions to Generate Versatile Hemostatic Powders and Gels. Adv Healthc Mater 2024; 13:e2301945. [PMID: 37897223 DOI: 10.1002/adhm.202301945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/05/2023] [Indexed: 10/29/2023]
Abstract
Polymer-based hemostatic materials/devices have been increasingly exploited for versatile clinical scenarios, while there is an urgent need to reveal the rational design/facile approach for procoagulant surfaces through regulating blood-material interactions. In this work, degradable powders (PLPS) and thermoresponsive gels (F127-PLPS) are readily developed as promising hemostatic materials for versatile clinical applications, through tuning blood-material interactions with optimized grafting of cationic polylysine: the former is facilely prepared by conjugating polylysine onto porous starch particle, while F127-PLPS is prepared by the simple mixture of PLPS and commercial thermosensitive polymer. In vitro and in vivo results demonstrate that PLPS2 with the optimal-/medium content of polylysine grafts achieve the superior hemostatic performance. The underlying procoagulant mechanism of PLPS2 surface is revealed as the selective fibrinogen adsorption among the competitive plasma-protein-adsorption process, which is the foundation of other blood-material interactions. Moreover, in vitro results confirm the achieved procoagulant surface of F127-PLPS through optimal PLPS2 loading. Together with the tunable thermoresponsiveness, F127-PLPS exhibits outstanding hemostatic utilization in both femoral-artery-injury and renal-artery-embolization models. The work thereby pioneers an appealing approach for generating versatile polymer-based hemostatic materials/devices.
Collapse
Affiliation(s)
- Xueru Wang
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Kai Yuan
- Department of Interventional Radiology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Yang Su
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaoyue Li
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Limin Meng
- Department of Medical Imaging, Air Force Medical Center, PLA, Beijing, 100142, China
| | - Nana Zhao
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yang Hu
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Feng Duan
- Department of Interventional Radiology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Fu-Jian Xu
- State Key Laboratory of Chemical Resource Engineering, Key Lab of Biomedical Materials of Natural Macromolecules (Beijing University of Chemical Technology, Ministry of Education), Beijing Laboratory of Biomedical Material, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| |
Collapse
|
2
|
Andre G, Boschetto F, Gokani V, Singhal M, Jing Y, Kim HKW, Ma C. Ex vivo study of detergent-assisted intraosseous bone wash treatment of osteonecrosis. J Orthop Res 2023; 41:1482-1493. [PMID: 36453529 PMCID: PMC10232679 DOI: 10.1002/jor.25496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 11/21/2022] [Accepted: 11/28/2022] [Indexed: 12/04/2022]
Abstract
Avascular necrosis (AVN) involves ischemic cell death of the bone. AVN leaves an abundance of necrotic lipids and debris in the bone marrow, which instigates inflammatory bone repair. Consequently, the necrotic bone microenvironment stimulates excessive bone resorption, leading to joint deformities and osteoarthritis. Here, we performed a detergent-assisted bone wash using poloxamer 407 (P407) to clean the necrotic bone environment by removing lipids and necrotic debris. The new concept was tested using an established ex vivo AVN model of porcine cadaver humeral heads. The P407 wash was performed using P407 solution and followed with saline via two intraosseous needles. Visual inspection and image analyses of average pixel light intensity showed that the P407 wash produced a better-cleaned bone than the saline wash. Analyses of the collected bone wash solution showed a two-fold increase in triglycerides (101 vs. 53 mmol/head, p = 0.006) and a 10-fold increase in the dry weight of the removed debris (1.34 vs. 0.13 g/head, p = 0.02) with the P407 wash compared to saline. The histological evaluation showed significantly decreased Oil-Red-O (fats) staining in the P407-washed bone compared with the saline-washed bone. The in vitro assays of Alizarin red and qPCR showed the P407 wash neither altered the osteogenic behaviors of porcine bone marrow-derived mesenchymal cells (pBMMCs) nor raised inflammatory responses of porcine bone marrow-derived macrophages (pBMMs). In conclusion, detergent-assisted bone wash using P407 produced a better removal of nonsoluble debris from the bone marrow space than the saline wash without causing changes to osteogenesis or inflammatory reactions.
Collapse
Affiliation(s)
- Graham Andre
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
| | - Francesco Boschetto
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
| | - Vishal Gokani
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
| | - Mo Singhal
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
| | - Yan Jing
- Department of Orthodontics, Texas A&M School of Dentistry, Dallas, Texas, USA
| | - Harry K W Kim
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
- Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Chi Ma
- Center for Excellence in Hip, Scottish Rite for Children, Dallas, Texas, USA
- Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| |
Collapse
|
3
|
Chen IC, Su CY, Chen PY, Hoang TC, Tsou YS, Fang HW. Investigation and Characterization of Factors Affecting Rheological Properties of Poloxamer-Based Thermo-Sensitive Hydrogel. Polymers (Basel) 2022; 14:polym14245353. [PMID: 36559720 PMCID: PMC9781578 DOI: 10.3390/polym14245353] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/01/2022] [Accepted: 12/05/2022] [Indexed: 12/13/2022] Open
Abstract
Poloxamers are negatively temperature-sensitive hydrogels and their hydrophilic groups interact with water molecules at lower temperatures (liquid phase) while their hydrophobic groups interact more strongly with increases in temperature causing gelation. To investigate the factors affecting the rheological properties of poloxamers, various parameters including different poloxamer P407 concentrations, poloxamers P407/P188 blending ratios and additives were examined. The results presented a clear trend of decreasing gelling temperature/time when P407 was at higher concentrations. Moreover, the addition of P188 enhanced the gelling temperature regardless of poloxamer concentration. Polysaccharides and their derivatives have been widely used as components of hydrogel and we found that alginic acid (AA) or carboxymethyl cellulose (CMC) reduced the gelling temperature of poloxamers. In addition, AA-containing poloxamer promoted cell proliferation and both AA -and CMC-containing poloxamer hydrogels reduced cell migration. This study investigated the intriguing characteristics of poloxamer-based hydrogel, providing useful information to compounding an ideal and desired thermo-sensitive hydrogel for further potential clinical applications such as development of sprayable anti-adhesive barrier, wound-healing dressings or injectable drug-delivery system for cartilage repair.
Collapse
Affiliation(s)
- I-Cheng Chen
- Accelerator for Happiness and Health Industry, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
| | - Chen-Ying Su
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
| | - Pei-Yu Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
| | - The Chien Hoang
- Biotegy Vietnam Company Limited, No. 23, Alley 48, Tho Lao Street, Dong Mac Ward, Hai Ba Trung District, Hanoi City 11609, Vietnam
| | - Yi-Syue Tsou
- Department of Neurosurgery, Taipei Medical University Hospital, Taipei 110301, Taiwan
- Taipei Neuroscience Institute, Taipei Medical University, Taipei 110301, Taiwan
- The Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University and National Health Research Institutes, Taipei 110301, Taiwan
| | - Hsu-Wei Fang
- Accelerator for Happiness and Health Industry, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, No. 35, Keyan Road, Zhunan Town, Miaoli County 35053, Taiwan
- Correspondence: ; Tel.: +886-2-2771-2171 (ext. 2521)
| |
Collapse
|
4
|
Temperature-responsive hydrogel for tumor embolization therapy. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.104107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
5
|
Ko G, Choi JW, Lee N, Kim D, Hyeon T, Kim HC. Recent progress in liquid embolic agents. Biomaterials 2022; 287:121634. [PMID: 35716628 DOI: 10.1016/j.biomaterials.2022.121634] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 06/08/2022] [Accepted: 06/10/2022] [Indexed: 11/21/2022]
Abstract
Vascular embolization is a non-surgical procedure used to treat diseases or morbid conditions related to blood vessels, such as bleeding, arteriovenous malformation, aneurysm, and hypervascular tumors, through the intentional occlusion of blood vessels. Among various types of embolic agents that have been applied, liquid embolic agents are gaining an increasing amount of attention owing to their advantages in distal infiltration into regions where solid embolic agents cannot reach, enabling more extensive embolization. Meanwhile, recent advances in biomaterials and technologies have also contributed to the development of novel liquid embolic agents that can resolve the challenges faced while using the existing embolic materials. In this review, we briefly summarize the clinically used embolic agents and their applications, and then present selected research results that overcome the limitations of the embolic agents in use. Through this review, we suggest the required properties of liquid embolic agents that ensure efficacy, which can replace the existing agents, providing directions for the future development in this field.
Collapse
Affiliation(s)
- Giho Ko
- Center for Nanoparticle Research, Institute for Basic Spegcience (IBS), Seoul 08826, Republic of Korea; School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea
| | - Jin Woo Choi
- Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - Nohyun Lee
- School of Advanced Materials Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Dokyoon Kim
- Department of Bionano Engineering and Bionanotechnology, Hanyang University, Ansan 15588, Republic of Korea.
| | - Taeghwan Hyeon
- Center for Nanoparticle Research, Institute for Basic Spegcience (IBS), Seoul 08826, Republic of Korea; School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
| | - Hyo-Cheol Kim
- Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul 03080, Republic of Korea.
| |
Collapse
|
6
|
Emerging Polymer Materials in Trackable Endovascular Embolization and Cell Delivery: From Hype to Hope. Biomimetics (Basel) 2022; 7:biomimetics7020077. [PMID: 35735593 PMCID: PMC9221114 DOI: 10.3390/biomimetics7020077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 06/05/2022] [Accepted: 06/08/2022] [Indexed: 02/01/2023] Open
Abstract
Minimally invasive endovascular embolization is a widely used clinical technique used for the occlusion of blood vessels to treat various diseases. Different occlusive agents ranging from gelatin foam to synthetic polymers such as poly(vinyl alcohol) (PVA) have been commercially used for embolization. However, these agents have some drawbacks, such as undesired toxicity and unintended and uncontrolled occlusion. To overcome these issues, several polymer-based embolic systems are under investigation including biocompatible and biodegradable microspheres, gelling liquid embolic with controlled occlusive features, and trackable microspheres with enhanced safety profiles. This review aims to summarize recent advances in current and emerging polymeric materials as embolization agents with varying material architectures. Furthermore, this review also explores the potential of combining injectable embolic agents and cell therapy to achieve more effective embolization with the promise of outstanding results in treating various devastating diseases. Finally, limitations and challenges in developing next-generation multifunctional embolic agents are discussed to promote advancement in this emerging field.
Collapse
|
7
|
Poloxamer-Based Scaffolds for Tissue Engineering Applications: A Review. Gels 2022; 8:gels8060360. [PMID: 35735704 PMCID: PMC9222596 DOI: 10.3390/gels8060360] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/28/2022] [Accepted: 06/01/2022] [Indexed: 12/28/2022] Open
Abstract
Poloxamer is a triblock copolymer with amphiphilicity and reversible thermal responsiveness and has wide application prospects in biomedical applications owing to its multifunctional properties. Poloxamer hydrogels play a crucial role in the field of tissue engineering and have been regarded as injectable scaffolds for loading cells or growth factors (GFs) in the last few years. Hydrogel micelles can maintain the integrity and stability of cells and GFs and form an appropriate vascular network at the application site, thus creating an appropriate microenvironment for cell growth, nerve growth, or bone integration. The injectability and low toxicity of poloxamer hydrogels make them a noninvasive method. In addition, they can also be good candidates for bio-inks, the raw material for three-dimensional (3D) printing. However, the potential of poloxamer hydrogels has not been fully explored owing to the complex biological challenges. In this review, the latest progress and cutting-edge research of poloxamer-based scaffolds in different fields of application such as the bone, vascular, cartilage, skin, nervous system, and organs in tissue engineering and 3D printing are reviewed, and the important roles of poloxamers in tissue engineering scaffolds are discussed in depth.
Collapse
|
8
|
Zhang Z, Pan Y, Zhao Y, Ren M, Li Y, Lu G, Wu K, He S. Topotecan-loaded thermosensitive nanocargo for tumor therapy: In vitro and in vivo analyses. Int J Pharm 2021; 606:120871. [PMID: 34246742 DOI: 10.1016/j.ijpharm.2021.120871] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 06/29/2021] [Accepted: 07/06/2021] [Indexed: 01/09/2023]
Abstract
This study demonstrates the development of topotecan (TCN) loaded thermosensitive nanocargos (TCN-TS-NC) for intramuscular (IM) administration with enhanced antitumor activity. In this regards, TCN loaded temperature dependent solid lipid nanoparticles (SLNs) were prepared with micro-emulsion method, which were then incorporated into temperature sensitive poloxamer solution to develop TCN-TS-NC. The particle size, entrapment efficiency (%EE), zeta potential and transmission electron microscopy (TEM) analysis of the TCN-TS-NC were performed. Moreover, the inject-ability, release pattern, apoptosis, cellular uptake, pharmacokinetics and antitumor studies of the TCN-TS-NC were attained and compared with TCN solution and TCN-Emulgel (poloxamer solution containing TCN). At room temperature, the TCN loaded SLNs were solid and poloxamer solution remains liquid, however, TCN loaded SLNs melted to liquid and Emulgel converted into gel from, at body temperature, resulting controlled release of the incorporated drug. The TCN-TS-NC showed enhanced cellular uptake and better apoptosis. Similarly, it reduces Cmax and sustained its level for a significantly longer time in rats, as compared to the TCN-Emulgel and TCN solution. Moreover, a significantly improved antitumor activity was observed in TCN-TS-NC treated tumor bearing athymic nude mice when compared with the control, TCN solution and TCN-Emulgel applied mice. Thus, the TCN-TS-NC system showed control release of the drug with no initial fast effect. Furthermore, it enhanced the antitumor activity of TCN with comparatively no toxicity. It is therefore concluded that TCN-TS-NC could be a potentially more suitable drug delivery system for the delivery of TCN.
Collapse
Affiliation(s)
- Zhiyong Zhang
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China
| | - Yan Pan
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases, and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Shaanxi, China
| | - Yan Zhao
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China
| | - Mudan Ren
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China
| | - Yarui Li
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China
| | - Guifang Lu
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China
| | - Kaichun Wu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases, and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Shaanxi, China
| | - Shuixiang He
- Department of Gastroenterology, First Affiliated Hospital of Xi'an Jiaotong University, Shaanxi, China.
| |
Collapse
|
9
|
Xing R, Mustapha O, Ali T, Rehman M, Zaidi SS, Baseer A, Batool S, Mukhtiar M, Shafique S, Malik M, Sohail S, Ali Z, Zahid F, Zeb A, Shah F, Yousaf A, Din F. Development, Characterization, and Evaluation of SLN-Loaded Thermoresponsive Hydrogel System of Topotecan as Biological Macromolecule for Colorectal Delivery. BIOMED RESEARCH INTERNATIONAL 2021; 2021:9968602. [PMID: 34285920 PMCID: PMC8275402 DOI: 10.1155/2021/9968602] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/21/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Chemotherapeutic drugs cause severe toxicities if administered unprotected, without proper targeting, and controlled release. In this study, we developed topotecan- (TPT-) loaded solid lipid nanoparticles (SLNs) for their chemotherapeutic effect against colorectal cancer. The TPT-SLNs were further incorporated into a thermoresponsive hydrogel system (TRHS) (TPT-SLNs-TRHS) to ensure control release and reduce toxicity of the drug. Microemulsion technique and cold method were, respectively, used to develop TPT-SLNs and TPT-SLNs-TRHS. Particle size, polydispersive index (PDI), and incorporation efficiency (IE) of the TPT-SLNs were determined. Similarly, gelation time, gel strength, and bioadhesive force studies of the TPT-SLNs-TRHS were performed. Additionally, in vitro release and pharmacokinetic and antitumour evaluations of the formulation were done. RESULTS TPT-SLNs have uniformly distributed particles with mean size in nanorange (174 nm) and IE of ~90%. TPT-SLNs-TRHS demonstrated suitable gelation properties upon administration into the rat's rectum. Moreover, drug release was exhibited in a control manner over an extended period of time for the incorporated TPT. Pharmacokinetic studies showed enhanced bioavailability of the TPT with improved plasma concentration and AUC. Further, it showed significantly enhanced antitumour effect in tumour-bearing mice as compared to the test formulations. CONCLUSION It can be concluded that SLNs incorporated in TRHS could be a potential source of the antitumour drug delivery with better control of the drug release and no toxicity.
Collapse
Affiliation(s)
- R. Xing
- Department of Pharmacy, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
- Beijing Key Laboratory of Bio-characteristic Profiling for Evaluation of Rational Drug Use, Beijing 100038, China
| | - O. Mustapha
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, DOW University of Health Sciences, 74200 Karachi, Pakistan
| | - T. Ali
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, DOW University of Health Sciences, 74200 Karachi, Pakistan
| | - M. Rehman
- HE.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - S. S. Zaidi
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, DOW University of Health Sciences, 74200 Karachi, Pakistan
| | - A. Baseer
- Department of Pharmacy, Abasyn University Peshawar, KPK, Pakistan
| | - S. Batool
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - M. Mukhtiar
- Department of Pharmacy, Faculty of Medical and Health Sciences, University of Poonch Rawalakot, AJK, Pakistan
| | - S. Shafique
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, DOW University of Health Sciences, 74200 Karachi, Pakistan
| | - M. Malik
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - S. Sohail
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Z. Ali
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - F. Zahid
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - A. Zeb
- Riphah Institute of Pharmaceutical Sciences, Riphah International University, Sector G-7/4, Islamabad 44000, Pakistan
| | - F. Shah
- Riphah Institute of Pharmaceutical Sciences, Riphah International University, Sector G-7/4, Islamabad 44000, Pakistan
| | - A. Yousaf
- Department of Pharmacy, COMSATS University Islamabad, Lahore Campus, Lahore 54000, Pakistan
| | - F. Din
- Nanomedicine Research Group, Department of Pharmacy, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| |
Collapse
|
10
|
Liu M, Wu C, Ke L, Li Z, Wu YL. Emerging Biomaterials-Based Strategies for Inhibiting Vasculature Function in Cancer Therapy. SMALL METHODS 2021; 5:e2100347. [PMID: 34927997 DOI: 10.1002/smtd.202100347] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/20/2021] [Indexed: 06/14/2023]
Abstract
The constant feeding of oxygen and nutrients through the blood vasculature has a vital role in maintaining tumor growth. Interestingly, recent endeavors have shown that nanotherapeutics with the strategy to block tumor blood vessels feeding nutrients and oxygen for starvation therapy can be helpful in cancer treatment. However, this field has not been detailed. Hence, this review will present an exhaustive summary of the existing biomaterial based strategies to disrupt tumor vascular function for effective cancer treatment, including hydrogel or nanogel-mediated local arterial embolism, thrombosis activator loaded nano-material-mediated vascular occlusion and anti-vascular drugs that block tumor vascular function, which may be beneficial to the design of anti-cancer nanomedicine by targeting the tumor vascular system.
Collapse
Affiliation(s)
- Minting Liu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, 361102, China
| | - Caisheng Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, 361102, China
| | - Lingjie Ke
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, 361102, China
| | - Zhiguo Li
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, 361102, China
| | - Yun-Long Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, 361102, China
| |
Collapse
|
11
|
Abstract
Therapeutic viral gene delivery is an emerging technology which aims to correct genetic mutations by introducing new genetic information to cells either to correct a faulty gene or to initiate cell death in oncolytic treatments. In recent years, significant scientific progress has led to several clinical trials resulting in the approval of gene therapies for human treatment. However, successful therapies remain limited due to a number of challenges such as inefficient cell uptake, low transduction efficiency (TE), limited tropism, liver toxicity and immune response. To adress these issues and increase the number of available therapies, additives from a broad range of materials like polymers, peptides, lipids, nanoparticles, and small molecules have been applied so far. The scope of this review is to highlight these selected delivery systems from a materials perspective.
Collapse
Affiliation(s)
- Kübra Kaygisiz
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | | |
Collapse
|
12
|
Hu J, Albadawi H, Oklu R, Chong BW, Deipolyi AR, Sheth RA, Khademhosseini A. Advances in Biomaterials and Technologies for Vascular Embolization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901071. [PMID: 31168915 PMCID: PMC7014563 DOI: 10.1002/adma.201901071] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/24/2019] [Indexed: 05/03/2023]
Abstract
Minimally invasive transcatheter embolization is a common nonsurgical procedure in interventional radiology used for the deliberate occlusion of blood vessels for the treatment of diseased or injured vasculature. A wide variety of embolic agents including metallic coils, calibrated microspheres, and liquids are available for clinical practice. Additionally, advances in biomaterials, such as shape-memory foams, biodegradable polymers, and in situ gelling solutions have led to the development of novel preclinical embolic agents. The aim here is to provide a comprehensive overview of current and emerging technologies in endovascular embolization with respect to devices, materials, mechanisms, and design guidelines. Limitations and challenges in embolic materials are also discussed to promote advancement in the field.
Collapse
Affiliation(s)
- Jingjie Hu
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Hassan Albadawi
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Rahmi Oklu
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Brian W Chong
- Departments of Radiology and Neurological Surgery, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Amy R. Deipolyi
- Department of Interventional Radiology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medical Center, 1275 York Avenue, New York, New York 10065, USA
| | - Rahul A. Sheth
- Department of Interventional Radiology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77054, USA
| | - Ali Khademhosseini
- Department of Bioengineering, Department of Radiological Sciences, Department of Chemical and Biomolecular Engineering, Center for Minimally Invasive Therapeutics, California Nanosystems Institute, University of California, 410 Westwood Plaza, Los Angeles, California 90095, USA
| |
Collapse
|
13
|
Hemostatic Control of Coronary Arteries with Poloxamer 407 Reverse-Thermal Polymer during Off-Pump Coronary Artery Bypass Surgery in a Pig Model. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2019; 2:36-9. [DOI: 10.1097/imi.0b013e3180313a32] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Objective To evaluate a new material, poloxamer 407 reversethermal polymer, which may be of value in controlling bleeding during off-pump coronary anastomoses. Methods Poloxamer 407 reverse-thermal polymer is a clear, nontoxic compound that is a viscous liquid at room temperature but instantly changes to a firm, water-soluble gel when warmed to body temperature. Six pigs underwent off-pump coronary artery bypass with the left internal mammary artery to the left anterior descending coronary artery. Blood loss from the arteriotomy was measured over a 15-minute period before and after injection of 500 μL intracoronary polymer. After completion of the anastomosis, 10 mL of cold saline was poured along the left anterior descending artery to facilitate dissolution of the polymer. The heart was allowed to beat 2 additional hours with blood flowing through the left internal mammary to left anterior descending graft, after which a completion angiogram was obtained to evaluate graft patency and to look for gross angiographic evidence of coronary branch occlusion or intraluminal filling defects. The animals were then humanely euthanized, and myocardium from the area subtended by the left anterior descending was harvested for histologic evaluation. Results All animals successfully underwent the surgical procedure and survived until study termination without any complications. The amount of bleeding from coronary arteriotomy was significantly higher before intracoronary injection of the polymer (5.25 ± 1.65 mL/min versus 0.54 ± 0.53 mL/min, P = 0.0004). Angiography demonstrated that the graft was patent, and there was no evidence of intraluminal foreign bodies. Myocardial samples from the subtended bed showed no evidence of intraarterial polymer or myonecrosis. Conclusions Poloxamer 407 reverse-thermal polymer may be a valuable tool in performing coronary anastomoses off-pump. Completion angiograms showed total dissolution of the material with no residual intraarterial polymer visible on tissue samples.
Collapse
|
14
|
Use of the Purified Poloxamer 407 for Temporary Coronary Occlusion in Off-Pump CABG Does Not Cause Myocardial Injury. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2019; 2:201-4. [DOI: 10.1097/imi.0b013e318095a9e0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Objective The new poloxamer 407 (LeGoo), a thermoreversible gel, previously showed efficiency in temporarily occluding coronary arteries and preserving endothelial function. However, its long-term effect on the myocardium after dissolution in bloodstream is uncertain. Methods Two groups of pigs (12 total) were compared after being submitted to a 10-minute coronary occlusion either with silastic loops (snare group) or with poloxamer 407 injection (P407 group). Reflow was procured by snare removal or P407 dissolution with topical cooling. Animals were kept alive for 3 days with creatine kinase-MB and troponin T (TnT) plasmatic measurement at 3 hours and 3 days after surgery, when they were killed for myocardial histopathologic study. Results Each animal survived during the study. Baseline plasmatic levels of cardiac enzymes were similar between both groups. No variation in creatine kinase-MB level throughout the study was seen in either group. A significant rise in TnT from baseline was noted 3 hours after reperfusion in both groups, with a peak level significantly lower in the P407 group (P < 0.05). TnT plasmatic levels returned to baseline level in both groups on the day the animals were killed (3 days). Histopathologic examinations of the stained myocardial samples showed no evidence of myocardial infarction either in the snare group or in the P407 group. Conclusions Poloxamer 407 does not cause myocardial damage after elimination in the bloodstream. The safety of this hemostatic device is now established, and application for FDA approval for human clinical studies is under way.
Collapse
|
15
|
Thermo-sensitive composite hydrogels based on poloxamer 407 and alginate and their therapeutic effect in embolization in rabbit VX2 liver tumors. Oncotarget 2018; 7:73280-73291. [PMID: 27602579 PMCID: PMC5341979 DOI: 10.18632/oncotarget.11789] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 08/25/2016] [Indexed: 12/11/2022] Open
Abstract
Interventional embolization therapy is an effective, most widely used method for inoperable liver tumors. Blood-vessel-embolic agents were essential in transarterial embolization (TAE). In this work, thermo-sensitive composite hydrogels based on poloxamer 407, sodium alginate, hydroxymethyl cellulose and iodixanol (PSHI), together with Ca2+ (PSHI-Ca2+) were prepared as liquid embolic agents for TAE therapy to liver cancer. With increasing temperature, PSHI exhibited two phase states: a flowing sol and a shrunken gel. Rheology tests showed good fluidity and excellent viscoelastic behavior with a gelation temperature (GT) of 26.5°C. The studies of erosion indicated that PSHI had calcium ion-related erosion characteristics and showed a slow erosion rate in an aqueous environment. When incubated with L929 cells, the thermo-sensitive composite hydrogels had low cytotoxicity in vitro. The results of analyzing the digital subtraction angiography and computed tomography images obtained from in vitro and in vivo assays indicated a good embolic effect in the renal arteries of normal rabbits. Angiography and histological studies on VX2 tumor-bearing rabbits indicated that PSHI-Ca2+ successfully occluded the tumors, including the peripheral vessels. In conclusion, PSHI-Ca2+ was a promising embolic agent for transarterial embolization therapy.
Collapse
|
16
|
Avery RK, Albadawi H, Akbari M, Zhang YS, Duggan MJ, Sahani DV, Olsen BD, Khademhosseini A, Oklu R. An injectable shear-thinning biomaterial for endovascular embolization. Sci Transl Med 2017; 8:365ra156. [PMID: 27856795 DOI: 10.1126/scitranslmed.aah5533] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 10/28/2016] [Indexed: 01/11/2023]
Abstract
Improved endovascular embolization of vascular conditions can generate better patient outcomes and minimize the need for repeat procedures. However, many embolic materials, such as metallic coils or liquid embolic agents, are associated with limitations and complications such as breakthrough bleeding, coil migration, coil compaction, recanalization, adhesion of the catheter to the embolic agent, or toxicity. Here, we engineered a shear-thinning biomaterial (STB), a nanocomposite hydrogel containing gelatin and silicate nanoplatelets, to function as an embolic agent for endovascular embolization procedures. STBs are injectable through clinical catheters and needles and have hemostatic activity comparable to metallic coils, the current gold standard. In addition, STBs withstand physiological pressures without fragmentation or displacement in elastomeric channels in vitro and in explant vessels ex vivo. In vitro experiments also indicated that STB embolization did not rely on intrinsic thrombosis as coils did for occlusion, suggesting that the biomaterial may be suitable for use in patients on anticoagulation therapy or those with coagulopathy. Using computed tomography imaging, the biomaterial was shown to fully occlude murine and porcine vasculature in vivo and remain at the site of injection without fragmentation or nontarget embolization. Given the advantages of rapid delivery, in vivo stability, and independent occlusion that does not rely on intrinsic thrombosis, STBs offer an alternative gel-based embolic agent with translational potential for endovascular embolization.
Collapse
Affiliation(s)
- Reginald K Avery
- Biomaterials Innovation Research Center, Department of Medicine, Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA.,Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Hassan Albadawi
- Department of Surgery, Division of Vascular and Endovascular Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Mohsen Akbari
- Biomaterials Innovation Research Center, Department of Medicine, Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Yu Shrike Zhang
- Biomaterials Innovation Research Center, Department of Medicine, Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Michael J Duggan
- Department of Surgery, Division of Trauma, Emergency Surgery and Surgical Critical Care, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02144, USA
| | - Dushyant V Sahani
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Bradley D Olsen
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Ali Khademhosseini
- Biomaterials Innovation Research Center, Department of Medicine, Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA. .,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.,Department of Physics, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Rahmi Oklu
- Biomaterials Innovation Research Center, Department of Medicine, Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02139, USA. .,Division of Vascular and Interventional Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| |
Collapse
|
17
|
Fakhar-Ud-Din, Khan GM. Development and characterisation of levosulpiride-loaded suppositories with improved bioavailability in vivo. Pharm Dev Technol 2017; 24:63-69. [PMID: 29251521 DOI: 10.1080/10837450.2017.1419256] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The purpose of this study was to develop and characterize levosulpiride loaded liquid suppository with improved bioavailability. The content of levosulpiride-loaded liquid suppositories were optimized in a series of experiments using various weight ratios of P188, P407, Tween 80, and drug. The suppositories were liquid at room temperature, however, when rectally administered, they became gel at body temperature. Their rheological properties and release characteristics were determined in vitro while pharmacokinetic study was performed after its rectal administration in rats and compared with drug suspension. Poloxamer 188 and Twee 80 decreased the gelation temperature and gelation time, but increased the gel strength and mucoadhesive force of liquid suppositories. Liquid suppository composed of [Levosulpiride/P 188/P 407/Tween 80 (1/15/17/3%)] with a gelation temperature of about 30.7 °C remained liquid at 25 °C, but converted to gel at 30-36.5 °C, resulting in easy administration and rapid gelation inside the body. This liquid suppository gave a considerably increased dissolution rate reflected in a meaningfully higher plasma concentration and 7.1-fold AUC values of levosulpiride in rats as compared to the drug suspension. Hence, liquid suppository system could be used for enhanced bioavailability of levosulpiride-loaded pharmaceutical products.
Collapse
Affiliation(s)
- Fakhar-Ud-Din
- a Department of Pharmacy , Quaid-i-Azam University , Islamabad , Pakistan
| | - Gul Majid Khan
- a Department of Pharmacy , Quaid-i-Azam University , Islamabad , Pakistan
| |
Collapse
|
18
|
Din FU, Kim DW, Choi JY, Thapa RK, Mustapha O, Kim DS, Oh YK, Ku SK, Youn YS, Oh KT, Yong CS, Kim JO, Choi HG. Irinotecan-loaded double-reversible thermogel with improved antitumor efficacy without initial burst effect and toxicity for intramuscular administration. Acta Biomater 2017; 54:239-248. [PMID: 28285074 DOI: 10.1016/j.actbio.2017.03.007] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 03/02/2017] [Accepted: 03/06/2017] [Indexed: 02/07/2023]
Abstract
Intramuscularly administered, anti-tumour drugs induce severe side effects due to their direct contact with body tissues and initial burst effect. In this study, to solve this problem, a novel double-reversible thermogel system (DRTG) for the intramuscular administration of irinotecan was developed. This irinotecan-loaded DRTG was prepared by dispersing the irinotecan-loaded thermoreversible solid lipid nanoparticles (SLNs) in the thermoreversible hydrogel. In DRTG, the former was solid at 25°C but converted to liquid at 36.5°C; in contrast, the latter existed in a liquid form but transformed to gel state in the body. The DRTG was easily administered intramuscularly. Its particle size and drug content were not noticeably changeable, resulting that it was stable at 40°C for at least 6months. Compared to the irinotecan-loaded solution and conventional hydrogel, the DRTG significantly delayed drug release, leading to a reduced burst effect. Moreover, it showed decreased Cmax and maintained the sustained plasma concentrations at a relatively low level for the long period of 60h in rats, resulting in ameliorated side effects of the anti-tumour drug. Furthermore, it gave significantly improved anti-tumour efficacy in tumour-bearing mice compared to the hydrogel but, unlike the conventional hydrogel, induced no body weight loss and local damage to the muscle. Thus, this DRTG with improved antitumor efficacy without initial burst effect and toxicity could provide a potential pharmaceutical system for the intramuscular administration of irinotecan. STATEMENT OF SIGNIFICANCE Intramuscularly administered, anti-tumour drugs induce severe side effects due to their direct contact with body tissues and initial burst effect. To solve this problem, we developed a novel double-reversible thermogel system (DRTG) for the intramuscular administration of irinotecan. Unlike the conventional hydrogel, the DRTG is a dispersion of the irinotecan-loaded thermoreversible solid lipid nanoparticles in the thermoreversible hydrogel. In DRTG, the former was solid at 25°C but converted to liquid at 36.5°C; in contrast, the latter existed in a liquid form but transformed to gel state in the body. This DRTG gave significantly improved anti-tumour efficacy in tumour-bearing mice compared to the hydrogel but, unlike the conventional hydrogel, induced no body weight loss and local damage to the muscle.
Collapse
|
19
|
Self-hardening and thermoresponsive alpha tricalcium phosphate/pluronic pastes. Acta Biomater 2017; 49:563-574. [PMID: 27872015 DOI: 10.1016/j.actbio.2016.11.043] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 11/14/2016] [Accepted: 11/17/2016] [Indexed: 11/21/2022]
Abstract
Although calcium phosphate cements (CPCs) are used for bone regeneration in a wide range of clinical applications, various physicochemical phenomena are known to hinder their potential use in minimally invasive surgery or in highly vascularized surgical sites, mainly because of their lack of injectability or their low washout resistance. The present work shows that the combination of CPCs with an inverse-thermoresponsive hydrogel is a good strategy for finely tuning the cohesive and rheological properties of CPCs to achieve clinical acceptable injectability to prevent phase separation during implantation and cohesion to avoid washout of the paste. The thermoresponsive CPC developed combines alpha-tricalcium phosphate with an aqueous solution of pluronic F127, which exhibits an inverse thermoresponsive behaviour, with a gelling transformation at around body temperature. These novel CPCs exhibited temperature-dependent properties. Addition of the polymer enhanced the injectability of the paste, even at a low liquid-to-powder ratio, and allowed the rheological properties of the cement to be tuned, with the injection force decreasing with the temperature of the paste. Moreover, the cohesion of the paste was also temperature-dependent and increased as the temperature of the host medium increased due to gelling induced in the paste. The thermoresponsive cement exhibited excellent cohesion and clinically acceptable setting times at 37°C, irrespective of the initial temperature of the paste. The addition of pluronic F127 slightly delayed the setting reaction in the early stages but did not hinder the full transformation to calcium-deficient hydroxyapatite. Moreover, the frozen storage of premixed thermoresponsive cement pastes was explored, the main physicochemical properties of the cements being maintained upon thawing, even after 18months of frozen storage. This avoids the need to mix the cement in the operating theatre and allows its use off-the-shelf. The reverse thermoresponsive cements studied herein open up new perspectives in the surgical field, where the sequential gelling/hardening of these novel cements could allow for a better and safer clinical application. STATEMENT OF SIGNIFICANCE Calcium phosphate cements are attractive bone substitutes due to their similarity to the bone mineral phase. Although they can be injectable, cohesion and stability of the paste are crucial in terms of performance and safety. A common strategy is the combination with hydrogels. However, this often results in a decrease of viscosity with increasing temperature, which can lead to extravasation and particle leakage from the bone defect. The preferred evolution would be the opposite: a low viscosity would enhance mixing and injection, and an instantaneous increase of viscosity after injection would ensure washout resistance to the blood flow. Here we develop for the first time a calcium phosphate cement exhibiting reverse thermoresponsive properties using a poloxamer featuring inverse thermal gelling.
Collapse
|
20
|
Abstract
Key to the widespread application of smart polymers in drug delivery is understanding the mechanistic interplay, as well as consequence, of the presence of these macromolecules within living systems.
Collapse
Affiliation(s)
| | - S. Moein Moghimi
- School of Medicine
- Pharmacy and Health
- Durham University
- Stockton-on-Tees
- UK
| |
Collapse
|
21
|
Momeni A, Valliant EM, Brennan-Pierce EP, Shankar JJS, Abraham R, Colp P, Filiaggi MJ. Developing an in situ forming polyphosphate coacervate as a new liquid embolic agent: From experimental design to pilot animal study. Acta Biomater 2016; 32:286-297. [PMID: 26689465 DOI: 10.1016/j.actbio.2015.12.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Revised: 12/02/2015] [Accepted: 12/08/2015] [Indexed: 12/18/2022]
Abstract
A radiopaque temporary liquid embolic agent was synthesized from polyphosphate (PP) coacervates and optimized using a design of experiments approach. Variables studied were: strontium substitution (0-15 mol%), barium substitution (0-15 mol%), PP concentration and degree of polymerization of the polyphosphate (Dp). The viscosity, radiopacity and cell viability of the resulting coacervates were measured for 60 formulations and response surface modeling was used to determine the optimum coacervate that maximized radiopacity and cell viability. The optimum coacervate made from PP with a large Dp (9.5 g NaPP/100mL, 2.2 mol% Sr, 9 mol% Ba and 3.8 mol% Ca) was taken forward to a pilot animal trial. In this rabbit model, PP embolic agent successfully occluded the central auricular artery with promising biocompatibility. Further study is required to optimize the cohesiveness and clinical effectiveness of PP as an in situ setting temporary embolic agent. STATEMENT OF SIGNIFICANCE This article describes the development of a new radiopaque temporary liquid embolic agent from the optimization using design of experiments to a pilot animal study. Embolization is a minimally invasive interventional radiology procedure used to block blood flow in a targeted blood vessel. This procedure is used to treat many conditions including: tumors, aneurysms and arteriovenous malformations. Currently, no inherent radiopaque embolic agents are available in the clinic, which would allow for direct imaging of the material during the procedure and follow up treatment.
Collapse
|
22
|
Li J, Xue F, Xu X, Lu J, Dong D, Shi A, Lv Y. An optimized procedure for stained bloodless anatomic hepatectomy in canines. J Surg Res 2015; 200:508-13. [PMID: 26500185 DOI: 10.1016/j.jss.2015.09.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 08/30/2015] [Accepted: 09/18/2015] [Indexed: 11/18/2022]
Abstract
BACKGROUND Poloxamer 407 (P407) is a thermosensitive polymer that can gelatinize at body temperature and dissolve below critical temperature. The aim of this study was to evaluate an optimized procedure for hepatectomy, in which the target liver section was stained with methylene blue, and the blood inflow was occluded with P407. METHODS Twelve dogs were randomized into two equal groups. The conventional group (CG) underwent unstained liver resection with the hemi-Pringle maneuver for blood control. After angiography, the optimized group (OG) was cannulated to the target lobar hepatic artery via the femoral artery and to the target segmental portal vein via a branch of the splenic vein. The artery was then occluded with P407, whereas the vein was administered methylene blue and P407 sequentially before excision along the stained border. Blood specimens and necropsy were acquired periodically. RESULTS The stained resection margins were clearly visualized and were accompanied by negligible blood loss. The occlusion duration was significantly reduced from 24.5 ± 2.3 min in the conventional group to 18.5 ± 4.9 min in the OG (P < 0.05). The aspartate aminotransferase and alanine aminotransferase levels were less elevated in the OG postoperatively. No significant evidence of pathology was detected in either group. CONCLUSIONS This optimized procedure represents an easy, time-saving and effective approach for stained anatomic hepatectomy with temporary intravascular blood occlusion.
Collapse
Affiliation(s)
- Jianpeng Li
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Fei Xue
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Xianghua Xu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Jianwen Lu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Dinghui Dong
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Aihua Shi
- Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China
| | - Yi Lv
- Department of Hepatobiliary Surgery, First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi'an, China; Research Institute of Advanced Surgical Techniques and Engineering, Xi'an Jiaotong University, Xi'an, China; Regenerative Medicine and Surgery Engineering Research Center, Xi'an, China.
| |
Collapse
|
23
|
Wang PF, Li CH, Zhang AQ, Cai SW, Dong JH. A New Segmental Hepatectomy Approach Using Ultrasound-Guided Portal Branch Infusion of a Thermosensitive Gel in Pigs. J INVEST SURG 2015; 28:276-82. [PMID: 26305778 DOI: 10.3109/08941939.2015.1037941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND The aim of this study was to evaluate the safety, feasibility, and efficacy of a new segmental hepatectomy (SH) approach using intraoperative ultrasound (IOUS) guided infusion of a reversible thermosensitive gel into the portal vein branch in pigs; MATERIALS AND METHODS Poloxamer 407 aqueous solution (20%, W/V) was mixed with indocyanine green (P407-ICG) in this study to make it green, and it remained liquid at room temperature and turned into a firm gel upon reaching body temperature. In experiment I, six pigs were used to detect the outcome of infusing the mixture into the biliary tract, liver parenchyma, and hepatic vein for a safety study. In experiment II, another 12 pigs were randomly segmented into two groups [SH group and partial hepatectomy (PH) group] to investigate the feasibility and efficacy of the new approach using IOUS-guided infusion of the mixture into the portal branch; RESULTS No thermosensitive gel-induced abnormal changes were observed in the safety study. In the SH group, IOUS-guided infusion of the P407-ICG solution was effective in occluding the portal blood temporarily and demarcating the target liver segment to achieve precise SH. The blood loss in the SH group was significantly less than that of the PH group; CONCLUSIONS SH assisted by IOUS-guided infusion of the reversible thermosensitive gel into the feeding portal vein branches is feasible, safe, simple, and effective.
Collapse
Affiliation(s)
- Peng-Fei Wang
- a Department of Hepatobiliary Surgery, Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical College , Beijing , China
| | - Chong-Hui Li
- a Department of Hepatobiliary Surgery, Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical College , Beijing , China
| | - Ai-Qun Zhang
- a Department of Hepatobiliary Surgery, Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical College , Beijing , China
| | - Shou-Wang Cai
- a Department of Hepatobiliary Surgery, Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical College , Beijing , China
| | - Jia-Hong Dong
- a Department of Hepatobiliary Surgery, Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical College , Beijing , China
| |
Collapse
|
24
|
Din FU, Rashid R, Mustapha O, Kim DW, Park JH, Ku SK, Oh YK, Kim JO, Youn YS, Yong CS, Choi HG. Development of a novel solid lipid nanoparticles-loaded dual-reverse thermosensitive nanomicelle for intramuscular administration with sustained release and reduced toxicity. RSC Adv 2015. [DOI: 10.1039/c5ra05656j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The DRTN was prepared with flurbiprofen-loaded SLNs, poloxamers and water. The suspension transformed into a hydrogel at body temperature. The rheological characterization, release, pharmacokinetics and morphology were evaluated.
Collapse
Affiliation(s)
- Fakhar ud Din
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| | - Rehmana Rashid
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| | - Omer Mustapha
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| | - Dong Wuk Kim
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| | - Jong Hyuck Park
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| | - Sae Kwang Ku
- College of Oriental Medicine
- Daegu Haany University
- Gyongsan 712-715
- South Korea
| | - Yu-Kyoung Oh
- College of Pharmacy
- Seoul National University
- Seoul 151-742
- South Korea
| | - Jong Oh Kim
- College of Pharmacy
- Yeungnam University
- Gyongsan 712-749
- South Korea
| | - Yu Seok Youn
- School of Pharmacy
- Sungkyunkwan University
- Suwon 440-746
- South Korea
| | - Chul Soon Yong
- College of Pharmacy
- Yeungnam University
- Gyongsan 712-749
- South Korea
| | - Han-Gon Choi
- College of Pharmacy & Institute of Pharmaceutical Science and Technology
- Hanyang University
- Ansan 426-791
- South Korea
| |
Collapse
|
25
|
Oh KS, Kim JY, Yoon BD, Lee M, Kim H, Kim M, Seo JH, Yuk SH. Sol–gel transition of nanoparticles/polymer mixtures for sustained delivery of exenatide to treat type 2 diabetes mellitus. Eur J Pharm Biopharm 2014; 88:664-9. [DOI: 10.1016/j.ejpb.2014.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/08/2014] [Accepted: 08/11/2014] [Indexed: 11/16/2022]
|
26
|
Du LR, Lu XJ, Guan HT, Yang YJ, Gu MJ, Zheng ZZ, Lv TS, Yan ZG, Song L, Zou YH, Fu NQ, Qi XR, Fan TY. Development and evaluation of liquid embolic agents based on liquid crystalline material of glyceryl monooleate. Int J Pharm 2014; 471:285-96. [DOI: 10.1016/j.ijpharm.2014.05.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 05/07/2014] [Accepted: 05/19/2014] [Indexed: 11/16/2022]
|
27
|
Complement monitoring of Pluronic 127 gel and micelles: Suppression of copolymer-mediated complement activation by elevated serum levels of HDL, LDL, and apolipoproteins AI and B-100. J Control Release 2013; 170:167-74. [DOI: 10.1016/j.jconrel.2013.05.030] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 05/23/2013] [Accepted: 05/28/2013] [Indexed: 01/06/2023]
|
28
|
Gucu A, Cavusoglu I, Bozkurt O, Eris C, Toktas F, Goncu T, Ozyazicioglu A. Effects of temporary vascular occluder poloxamer 407 gel on the endothelium. J Cardiothorac Surg 2013; 8:16. [PMID: 23339359 PMCID: PMC3577636 DOI: 10.1186/1749-8090-8-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 01/03/2013] [Indexed: 12/02/2022] Open
Abstract
Background Coronary occlusion techniques during OPCAB may lead to an endothelial damage to the target vessel. The adverse effects of these techniques are well-known, and researches have been trying to find out new materials to occlude the coronary artery without an endothelial damage. In the present study, we investigate to the endothelial damage in the rat aorta which is occluded by Poloxamer 407 gel. Methods Forty-five rats were randomized in three groups: (1) segment of the aorta was occluded with Poloxamer 407 gel in P 407 group; (2) segment of the aorta was occluded with microvascular clamp in MV clamp group; and (3) no onclusion was available in the Control group. The rats were sacrificed of observation, and a 15mm segment of the aorta was obtained as a specimen. Integrity of the endothelial lining was observed with a scanning electron microscopy. Results Scanning electron microscopy revealed a statistically significant difference among the 3 groups (p<0,001) using the SPSS 13.0 test. No difference was found between the Control group and the P 407 group (p=0,059). The differences between MV clamp–Control group (p<0,001) and MV clamp–P 407 group were statistically significant (p<0,002). Conclusions We suggest that Poloxamer 407 gel occlusion may be a safer and more effective method compared to the microvascular clamp occlusion.
Collapse
Affiliation(s)
- Arif Gucu
- Department of Cardiovascular Surgery, Bursa Yuksek Ihtisas Training and Research Hospital, Bursa, Turkey.
| | | | | | | | | | | | | |
Collapse
|
29
|
A Novel Reverse Thermosensitive Polymer to Achieve Temporary Atraumatic Vessel Occlusion in Infra-popliteal Bypasses. Eur J Vasc Endovasc Surg 2013; 45:51-6. [DOI: 10.1016/j.ejvs.2012.10.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 10/11/2012] [Indexed: 11/18/2022]
|
30
|
Zhao H, Zheng C, Feng G, Zhao Y, Liang H, Wu H, Zhou G, Liang B, Wang Y, Xia X. Temperature-sensitive poly(N-isopropylacrylamide-co-butyl methylacrylate) nanogel as an embolic agent: distribution, durability of vascular occlusion, and inflammatory reactions in the renal artery of rabbits. AJNR Am J Neuroradiol 2013; 34:169-76. [PMID: 22859278 DOI: 10.3174/ajnr.a3177] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND PURPOSE We have developed a new thermosensitive liquid embolic agent, PIB nanogel, that can be solidified at body temperature. We thus further investigated the distribution, durability of vascular occlusion, and inflammatory reactions of PIB in embolization of the renal artery of rabbits. MATERIALS AND METHODS The bilateral renal arteries of 9 rabbits were first embolized with PIB at different injection rates. The distribution pattern of PIB was investigated by contact radiography and histology 1 hour after embolization. The right renal arteries of 20 rabbits were then embolized with PIB at the proper injection rate. Angiography and pathologic examination of the kidneys were performed at 1 week and 1, 2, and 3 months after embolization to evaluate the long-term outcomes. RESULTS With the injection rate increasing, PIB could reach the more distal branch of the renal artery. The proper injection rate was chosen as 0.10 mL/s due to the homogeneous distribution of PIB from the main renal artery to the precapillary level at this rate. During a 3-month follow-up observation period, no angiographic recanalization was observed. Histologically, we found no disruption of the vessel wall or subintimal bleeding, no extravasation of PIB, and no evidence of neovascularization. Moreover, there was only a mild inflammatory response, manifested by few lymphocytic and monocellular infiltration, without foreign body granuloma formation. CONCLUSIONS Embolization of the renal artery with PIB was easy and controllable, which could lead to a homogeneous and persistent occlusion without severe inflammatory changes. PIB might be a suitable material for intravascular embolization.
Collapse
Affiliation(s)
- H Zhao
- Department of Radiology, Union Hospital, Tongji Medical College, Wuhan, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Decrouy-Duruz V, Dubuis C, Déglise S, Corpataux JM, Saucy F. Investigations of a thermosensitive gel to temporarily occlude crural arteries in femoro-distal bypass surgery. Eur J Vasc Endovasc Surg 2012; 45:46-50. [PMID: 23131715 DOI: 10.1016/j.ejvs.2012.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 10/04/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVES Long occlusions in calcified crural arteries are a major cause of endovascular technical failure in patients with critical limb ischaemia. Therefore, distal bypasses are mainly performed in patients with heavily calcified arteries and with consequently delicate clamping. A new reverse thermosensitive polymer (RTP) is an alternative option to occlude target vessels. The aim of the study is to report our technical experience with RTP and to assess its safety and efficiency to temporarily occlude small calcified arteries during anastomosis time. METHODS Between July 2010 and December 2011, we used RTP to occlude crural arteries in 20 consecutive patients with 20 venous distal bypasses. We recorded several operative parameters, such as volume of injected RTP, duration of occlusion and anastomotic time. Quality of occlusion was subjectively evaluated. Routine on-table angiography was performed to search for plug emboli. Primary patency, limb salvage and survival rates were reported at 6 months. RESULTS In all patients, crural artery occlusion was achieved with the RTP without the use of an adjunct occlusion device. Mean volume of RTP used was 0.3 ml proximally and 0.25 ml distally. Mean duration of occlusion was 14.4 ± 4.5 min, while completion of the distal anastomosis lasted 13.4 ± 4.3 min. Quality of occlusion was judged as excellent in eight cases and good in 12 cases. Residual plugs were observed in two patients and removed with an embolectomy catheter, before we amended the technique for dissolution of RTP. At 6 months, primary patency rate was 75% but limb salvage rate was 87.5%. The 30-day mortality rate was 10%. CONCLUSIONS This study shows that RTP is safe when properly dissolved and effective to occlude small calcified arteries for completion of distal anastomosis.
Collapse
Affiliation(s)
- V Decrouy-Duruz
- Department of Thoracic and Vascular Surgery, Lausanne University Hospital, Rue du Bugnon 21, 1011 Lausanne, Switzerland.
| | | | | | | | | |
Collapse
|
32
|
Temporary vascular occlusion by rapid reverse phase polymer: a preliminary in vitro study of retrograde injection. Int J Biomater 2012; 2012:152845. [PMID: 22888352 PMCID: PMC3410310 DOI: 10.1155/2012/152845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 05/31/2012] [Indexed: 12/01/2022] Open
Abstract
During vascular surgical operations, there is a need for a simpler and more reliable method of temporary arterial occlusion than those currently employed, especially of heavily calcified arteries. A thermosensitive polymer, LeGoo (LG) (Pluromed, Woburn, MA), has been used successfully for temporary vascular occlusion. It has hitherto been injected by a cannula that has been introduced into the artery to be occluded, here henceforth called the “cannulation method.” Injection into arterial ostia without cannulation, using an injection device that arrests blood flow during the injection, here henceforth called “a retrograde method” may enable temporary hemostasis when ostial stenoses render it impossible to inject LG using the cannulation method. The objective of the present study was to study the feasibility of a retrograde method and to compare it with the cannulation method in an in vitro model, incorporating a narrow orifice to simulate ostial stenosis, using tap water at 37°C instead of blood. The retrograde method of LG injection, using a modified paediatric Foley catheter, turned out to be feasible to produce a durable LG plug more reliably, at higher water pressure and with less deep LG injection than with the cannulation method.
Collapse
|
33
|
Chabrot P, Fatimi A, Fraine PD, Ouchchane L, Dauplat MM, Rivard A, Lerouge S, Soulez G. Embolization and Endothelial Ablation With Chitosan and Sodium Sotradecol Sulfate: Preliminary Results in an Animal Model. J Endovasc Ther 2012; 19:439-49. [DOI: 10.1583/11-3745r.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
34
|
First results of clampless distal anastomosis in peripheral vascular bypass with LeGoo, a thermoreversible polymer. J Vasc Surg 2012; 55:1821-5. [DOI: 10.1016/j.jvs.2011.11.103] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 11/24/2022]
|
35
|
Pomposelli JJ, Akoad M, Flacke S, Benn JJ, Solano M, Kalra A, Madras PN. Feasibility of bloodless liver resection using Lumagel, a reverse thermoplastic polymer, to produce temporary, targeted hepatic blood flow interruption. HPB (Oxford) 2012; 14:115-21. [PMID: 22221572 PMCID: PMC3277053 DOI: 10.1111/j.1477-2574.2011.00412.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Lumagel, a reverse thermosensitive polymer (RTP), provides targeted flow interruption to the kidney by reversibly plugging segmental branches of the renal artery, allowing blood-free partial nephrectomy. Extending this technology to the liver requires the development of techniques for temporary occlusion of the hepatic artery and selected portal vein branches. METHODS A three-phased, 15 swine study was performed to determine feasibility, techniques and survival implications of using Lumagel for occlusion of inflow vessels to targeted portions of the liver. Lumagel was delivered using angiographic techniques to sites determined by pre-operative 3-D vascular reconstructions of arterial and venous branches. During resection, the targeted liver mass was resected without vascular clamping. Three survival swine were sacrificed at 3 weeks; the remainder at 6 weeks for pathological studies. RESULTS Six animals (100%) survived, with normal growth, blood tests and no adverse events. Three left lateral lobe resections encountered no bleeding during resection; one right median resection bled; two control animals bled significantly. Pre-terminal angiography and autopsy showed no local pathology and no remote organ damage. CONCLUSIONS Targeted flow interruption to the left lateral lobe of the swine liver is feasible and allows resection without bleeding, toxicity or pathological sequelae. Targeting the remaining liver will require more elaborate plug deposition owing to the extensive collateral venous network.
Collapse
Affiliation(s)
| | - Mohamed Akoad
- Departments of Transplantation and Hepatobiliary SurgeryBurlington
| | | | | | - Mauricio Solano
- Department of Radiology, Cummings School of Veterinary Medicine, Tufts UniversityNorth Grafton, MA, USA
| | | | - Peter N Madras
- Departments of Transplantation and Hepatobiliary SurgeryBurlington,Pluromed, Inc. WoburnNorth Grafton, MA, USA
| |
Collapse
|
36
|
Targeted endovascular temporary vessel occlusion with a reverse thermosensitive polymer for near-bloodless partial nephrectomy: comparison to standard surgical clamping techniques. Cardiovasc Intervent Radiol 2011; 35:1163-71. [PMID: 22160093 DOI: 10.1007/s00270-011-0304-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 10/16/2011] [Indexed: 10/14/2022]
Abstract
PURPOSE To determine whether reversible blood flow interruption to a randomly chosen target region of the kidney may be achieved with the injection of a reverse thermoplastic polymer through an angiographic catheter, thereby facilitating partial nephrectomy without compromising blood flow to the remaining kidney or adding risks beyond those encountered by the use of hilar clamping. METHODS Fifteen pigs underwent partial nephrectomy after blood flow interruption by vascular cross-clamping or injection of polymer (Lumagel™) into a segmental artery. Five animals were euthanized after surgery (three open and two laparoscopic resection, cross-clamping n = 2), and 10 (open resection, cross-clamping n = 4) were euthanized after 6 weeks' survival. Blood specimens were obtained periodically, and angiogram and necropsy were performed at 6 weeks. RESULTS Selective renal ischemia was achieved in all cases. Surgical resection time averaged 9 and 24.5 min in the open and laparoscopic groups, respectively. Estimated blood loss was negligible with the exception of one case where an accessory renal artery was originally overlooked. Reversal of the polymer to a liquid state was consistent angiographically and visually in all cases. Time to complete flow return averaged 7.4 and 2 min for polymer and clamping, respectively. Angiography at 6 weeks revealed no evidence of vascular injury. Laboratory data and necropsies revealed no differences between animals undergoing vascular clamping or polymer injection. CONCLUSION Lumagel was as effective as vascular clamping in producing a near bloodless operative field for partial nephrectomy while maintaining flow to the uninvolved portion of the affected kidney.
Collapse
|
37
|
Harty NJ, Moinzadeh A, Flacke S, Pettit J, Benn JA, Libertino JA, Madras PN. Temporary targeted hemostasis to facilitate bloodless partial nephrectomy. Urology 2011; 78:1435-41. [PMID: 22137714 DOI: 10.1016/j.urology.2011.07.1417] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 05/28/2011] [Accepted: 07/29/2011] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To extend previous robotic-assisted techniques developed in the swine model to studies of laparoscopic and open partial nephrectomy conducted in pigs and calves, designed to encompass vessel diameters similar to those encountered in humans. Lumagel (Pluromed, Woburn, MA), a nontoxic polymer, can be administered intra-arterially under fluoroscopic guidance to obtain a bloodless operative field during partial nephrectomy while maintaining normal circulation to uninvolved renal tissue. METHODS A total of 10 animals (7 pigs and 3 calves) underwent flow interruption to the kidney, 2 with cross-clamping of the main renal artery, the remaining with Lumagel. Other than the first pig and calf, all the animals then underwent partial nephrectomy. RESULTS Using Lumagel, targeted blood flow interruption was achieved and circulation to the uninvolved renal tissue was maintained. Hemostasis lasted for ≥30 minutes. The surgical resection time averaged 11 minutes (range 10-13) and 23.3 minutes (range 9-40) in the open and laparoscopic groups, respectively. The estimated blood loss was negligible, with the exception of 2 cases, 1 in which an error in angiographic assessment led to an unoccluded vessel near the resection site and a second case in which a guidewire was inadvertently passed through a vessel. The interval to complete flow return, as determined by direct visualization of the kidney and its corresponding angiogram, averaged 7 and 2.5 minutes for Lumagel and arterial clamping, respectively. CONCLUSION Lumagel provides reliable and reproducible intraluminal blood flow interruption and flow restoration in both main and segmental renal arteries. By providing blood-free resection, the techniques described could facilitate partial nephrectomy without global renal ischemia.
Collapse
Affiliation(s)
- Niall J Harty
- Department of Urology, Lahey Clinic, Burlington, Massachusetts 01805, USA
| | | | | | | | | | | | | |
Collapse
|
38
|
Wimmer-Greinecker G, Bouchot O, Verhoye JP, Perrault LP, Börgermann J, Diegeler A, Van Garsse L, Rastan AJ. Randomized Clinical Trial Comparing a Thermosensitive Polymer (LeGoo) With Conventional Vessel Loops for Temporary Coronary Artery Occlusion During Off-Pump Coronary Artery Bypass Surgery. Ann Thorac Surg 2011; 92:2177-83. [DOI: 10.1016/j.athoracsur.2011.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/04/2011] [Accepted: 07/11/2011] [Indexed: 11/26/2022]
|
39
|
Giessler GA, Fischborn GT, Schmidt AB. Clampless anastomosis with an intraluminal thermosensitive gel: first application in reconstructive microsurgery and literature review. J Plast Reconstr Aesthet Surg 2011; 65:100-5. [PMID: 21824832 DOI: 10.1016/j.bjps.2011.07.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 07/11/2011] [Accepted: 07/13/2011] [Indexed: 11/30/2022]
Abstract
Microvascular clamps of various designs provide a bloodless field for a safe anastomosis but can cause intimal lesions, occupy space in confined sites and have a risk of backwalling due to vessel flattening. They are often insufficient in their haemostatic effect in plaque-filled atherosclerotic vessels. A new, CE-certified thermosensitive gel (LeGoo™) clinically proven in cardiovascular surgery allows a clampless microanastomosis technique. We operated on a series of five consecutive patients aged 24-71 years with six flaps for lower-extremity reconstruction using a clampless anastomosis technique with LeGoo™. We transplanted one fabricated chimaeric fibula plus gracilis, three gracilis muscle and one anterolateral thigh (ALT) flap. Pre- and postoperative protocols were similar to a 'standard' procedure with micro-clamps. All flaps survived completely except for a small area on fibula skin island, which was unrelated to gel use. The gel-assisted technique has a quick learning curve, according to this case series. The veins should be sutured first to prevent stasis in the flap. The gel provides circular stenting and gentle distension of the vessels for a safe and blood-free anastomotic site. It is completely dissolved after completion of the anastomosis with cold saline irrigation. Repolymerisation in the periphery will not occur, making it safe for microvascular flap surgery. From the experiences from this series and other specialities, the use of the thermosensitive gel LeGoo™ permits a safe clampless microanastomosis technique minimising mechanical vessel manipulation and compression. This makes it an attractive alternative to micro-clamps, especially for atherosclerotic arteries and confined anastomosis sites.
Collapse
Affiliation(s)
- G A Giessler
- Department of Plastic, Hand and Reconstructive Microsurgery, BG Trauma Center, Professor Kuentscher Strasse 8, D-82418 Murnau, Germany.
| | | | | |
Collapse
|
40
|
Shalhoub J, Thapar A, Davies AH. The Use of Reverse Thermosensitive Polymer (LeGoo) for Temporary Vessel Occlusion in Clampless Peripheral Vascular Surgery. Vasc Endovascular Surg 2011; 45:422-5. [DOI: 10.1177/1538574411405546] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Introduction: There is a need to develop methods of vascular hemostasis, which limit vessel trauma. LeGoo is a reverse thermosensitive polymer (poloxamer) which is a viscous liquid at room temperature, becoming a firm plug at body temperature. We aimed to describe early single center experience in clampless peripheral vascular surgery. Methods: Single surgeon experience using LeGoo during peripheral vascular surgery between February and October 2010 was analyzed. Results: LeGoo was used in 13 anastomoses in 11 patients. A satisfactory bloodless field without the use of conventional occlusion devices was achieved in 92% of anastomoses. At a median of 36 weeks follow-up, total conduit patency was 91%. Conclusions: In this small series, LeGoo was seen to be safe and effective in the provision of a clamp-free bloodless field in the context of peripheral vascular surgery. Prospective comparative study is necessary to determine performance against conventional vascular clamps.
Collapse
Affiliation(s)
- Joseph Shalhoub
- Department of Vascular Surgery, Imperial Vascular Unit, Charing Cross Hospital, Imperial College London, London, UK,
| | - Ankur Thapar
- Department of Vascular Surgery, Imperial Vascular Unit, Charing Cross Hospital, Imperial College London, London, UK
| | - Alun H. Davies
- Department of Vascular Surgery, Imperial Vascular Unit, Charing Cross Hospital, Imperial College London, London, UK
| |
Collapse
|
41
|
San Norberto E, Salvador R, Revilla Á, Merino B, Vaquero C. Oclusión arterial atraumática con poloxámero 407: nueva técnica en arterias calcificadas. ANGIOLOGIA 2011. [DOI: 10.1016/j.angio.2011.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
42
|
Xuan JJ, Yan YD, Oh DH, Choi YK, Yong CS, Choi HG. Development of thermo-sensitive injectable hydrogel with sustained release of doxorubicin: Rheological characterization and in vivo evaluation in rats. Drug Deliv 2011; 18:305-11. [DOI: 10.3109/10717544.2010.544690] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
43
|
Rastan AJ, Noack T, Subramanian S, Nacar A, Holzhey D, Falk V, Mohr FW. Facilitated anastomosis using a reverse thermo-sensitive polymer for temporary coronary occlusion in off-pump minimally invasive direct coronary artery bypass surgery☆. Interact Cardiovasc Thorac Surg 2010; 11:532-6. [DOI: 10.1510/icvts.2010.233916] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
44
|
Xuan JJ, Balakrishnan P, Oh DH, Yeo WH, Park SM, Yong CS, Choi HG. Rheological characterization and in vivo evaluation of thermosensitive poloxamer-based hydrogel for intramuscular injection of piroxicam. Int J Pharm 2010; 395:317-23. [DOI: 10.1016/j.ijpharm.2010.05.042] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 05/17/2010] [Accepted: 05/27/2010] [Indexed: 10/19/2022]
|
45
|
Bouchot O, Berger RL, Berne JP, Brunotte F, Brenot R. Clinical Experience With a Novel Thermosensitive Temporary Coronary Artery Occluder (LeGoo). Ann Thorac Surg 2010; 89:1912-7. [DOI: 10.1016/j.athoracsur.2010.03.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2010] [Revised: 03/02/2010] [Accepted: 03/04/2010] [Indexed: 10/19/2022]
|
46
|
Flacke S, Moinzadeh A, Libertino JA, Merhige J, Vogel JM, Lyall K, Khettry U, Bakal CW, Madras PN. Endovascular temporary vessel occlusion with a reverse-thermosensitive polymer for bloodless minimally invasive renal surgery. J Vasc Interv Radiol 2010; 21:711-8. [PMID: 20307991 DOI: 10.1016/j.jvir.2010.01.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 10/31/2009] [Accepted: 01/19/2010] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To demonstrate the feasibility of reversible vessel embolization with angiographic guidance for delivery of a rapid reverse-thermosensitive polymer to provide hemostasis as an aid for minimally invasive renal surgery in a porcine model. MATERIALS AND METHODS After isolation of the left kidney of seven anesthetized pigs (50-70 kg) with a surgical robot, a renal angiogram of both kidneys was obtained. A 5-F angiographic catheter was used to selectively embolize a lower-pole segmental artery of the right and left kidney with a thermosensitive polymer (LeGoo-XL). Distal and proximal embolization of the target vessel was compared. Degree and duration of hemostasis and reversibility was determined. After complete hemostasis was obtained angiographically, a partial robotic lower-pole nephrectomy was performed on the left kidney only. RESULTS Only proximal embolization provided controllable hemostasis. A 20% polymer concentration in a buffer solution of 40% saline solution and 40% iodine contrast medium by weight injected at room temperature resulted in a reproducible embolus for more than 30 minutes, the time needed to perform a partial nephrectomy. The radiographic appearance of the embolus was used to determine the total amount of polymer needed. Cold saline solution completely dissolved any residual polymer at the end of surgery. CONCLUSIONS Proximal arterial occlusion with a thermosensitive polymer can be rapidly reversed with selective intraarterial infusion of chilled saline solution. Preceding nephron-sparing surgery with transcatheter embolization of the relevant branch of the renal artery with the polymer can facilitate the procedure and ought to be investigated further.
Collapse
Affiliation(s)
- Sebastian Flacke
- Department of Radiology, Lahey Clinic, Burlington, MA 01805, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Obstein KL, Martins FP, Fernández-Esparrach G, Thompson CC. Endoscopic ultrasound-guided celiac plexus neurolysis using a reverse phase polymer. World J Gastroenterol 2010; 16:728-31. [PMID: 20135721 PMCID: PMC2817061 DOI: 10.3748/wjg.v16.i6.728] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To assess the feasibility of endoscopic ultrasound (EUS)-guided celiac plexus neurolysis (CPN) using a poloxamer.
METHODS: In this prospective evaluation, six Yorkshire pigs underwent EUS-guided CPN. Three received an injection of 10 mL of 0.25% Lidocaine plus methylene blue (group 1) and three received an injection of 10 mL of 0.25% Lidocaine plus blue colored poloxamer (PS137-25) (group 2). Necropsy was performed immediately after the animals were sacrificed. The abdominal and pelvic cavities were examined for the presence of methylene blue and the blue colored poloxamer.
RESULTS: EUS-guided CPN was successfully performed in all 6 pigs without immediate complication. Methylene blue was identified throughout the peritoneal and retroperitoneal cavity in group 1. The blue colored poloxamer was found in the retroperitoneal cavity immediately adjacent to the aorta, in the exact location of the celiac plexus in group 2.
CONCLUSION: EUS-guided CPN using a reverse phase polymer in a non-survival porcine model was technically feasible. The presence of a poloxamer gel at the site of the celiac plexus at necropsy indicates a precise delivery of the neurolytic agent.
Collapse
|
48
|
Fernández-Esparrach G, Shaikh SN, Cohen A, Ryan MB, Thompson CC. Efficacy of a reverse-phase polymer as a submucosal injection solution for EMR: a comparative study (with video). Gastrointest Endosc 2009; 69:1135-9. [PMID: 19152883 DOI: 10.1016/j.gie.2008.07.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Accepted: 07/19/2008] [Indexed: 01/15/2023]
Abstract
INTRODUCTION Reverse-phase polymers undergo a temperature-dependent liquid-to-gel transition that may provide a more durable cushion for EMR and could yield improvements in safety and efficacy. OBJECTIVE Our purpose was to assess the efficacy of poloxamer solution PS137-25 as a submucosal injection. DESIGN Comparative study among 3 different solutions for EMR using ex vivo and in vivo porcine models. INTERVENTIONS A total of 120 gastric submucosal cushions were performed in fresh ex vivo porcine stomachs with saline solution 0.9% (n = 40), hydroxypropyl methylcellulose (HPMC) (n = 40), and PS137-25 (n = 40). Five in vivo porcine colon EMRs were then performed. MAIN OUTCOME MEASUREMENTS Height and duration of submucosal cushions were measured in the ex vivo model, and the usefulness of reverse-phase polymers was assessed by in vivo en bloc resection. RESULTS Ex vivo: The height of mucosal elevation was greater with PS137-25 (10.3 +/- 2.2 mm) than with saline solution (8.3 +/- 2.6 mm) or HPMC (9.05 +/- 2.3 mm, not significant). All submucosal elevations with PS137-25 lasted longer (more than 20 minutes) than with saline solution (20.9 +/- 11 minutes, P < .01) or HPMC (89 +/- 32 minutes, P < .01). After 120 minutes, the elevations obtained with PS137-25 showed no differences in size, shape, or consistency from initial measurements. In vivo: All 5 EMRs were successfully performed after 1 injection of PS137-25. No repeat injections were needed. During resection, a large gel cushion was noted. CONCLUSIONS Mucosal elevation with PS137-25 is more durable than with other substances, with no changes in size or consistency observed over 120 minutes. Additionally, reverse-phase polymers performed well in in vivo colon EMRs. These results suggest that reverse-phase polymers may provide increased safety and efficacy for EMR procedures.
Collapse
|
49
|
Dai F, Tang L, Yang J, Zhao X, Liu W, Chen G, Xiao F, Feng X. Fast thermoresponsive BAB-type HEMA/NIPAAm triblock copolymer solutions for embolization of abnormal blood vessels. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:967-974. [PMID: 19020956 DOI: 10.1007/s10856-008-3632-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Accepted: 10/16/2008] [Indexed: 05/27/2023]
Abstract
Thermoresponsive BAB-type HEMA/NIPAAm triblock copolymers (A = NIPAAm, B = HEMA) were prepared by atomic transfer radical polymerization (ATRP). BAB1-6 with shorter PNIPAAm blocks failed to form stable gel; while a relatively stable gel could be achieved by BAB1-8 with longer PNIPAAm blocks when copolymer aqueous solution was heated up. Introducing radiopaque agent (RA) was shown to slightly increase the transition temperature and gelation time, but the gelling ability was strengthened due to slightly weakening dehydration of copolymer in the mixture of water and RA. BAB1-8 aqueous solution about 5 wt% in the presence of RA was demonstrated to successfully occlude the cerebral rete mirabiles (RMs) and renal arteries of pigs. Within 3-month surgery, no recanalization was observed and the embolized kidney shrank considerably. Histological assay of embolized kidney demonstrated interstitial fibrosis and calcification as well as the thickening of renal small artery. This temperature sensitive copolymer with well-defined architecture holds a great potential as an embolic agent for treating arteriovenous malformations (AVMs) and renal disease due to the design flexibility of ATRP.
Collapse
Affiliation(s)
- Fengying Dai
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Yoon NY, Kim HR, Chung HY, Choi JS. Anti-hyperlipidemic effect of an edible brown algae, Ecklonia stolonifera, and its constituents on poloxamer 407-induced hyperlipidemic and cholesterol-fed rats. Arch Pharm Res 2008; 31:1564-71. [PMID: 19099225 DOI: 10.1007/s12272-001-2152-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Revised: 09/29/2008] [Accepted: 11/20/2008] [Indexed: 10/21/2022]
Abstract
We conducted this study to isolate novel anti-hyperlipidemic agents derived from natural marine products. To accomplish this, we investigated the effects of ethanolic (EtOH) extracts of Ecklonia stolonifera and its phlorotannin constituents, eckol and dieckol, on serum lipid levels in rats with hyperlipidemia that was induced by a high-cholesterol diet or poloxamer 407. Treatment with the EtOH extracts of E. stolonifera and its phlorotannin-rich ethyl acetate (EtOAc) and n-butanol (n-BuOH) fractions induced a significant reduction in triglycerides (TG), total cholesterol (TC), and low-density lipoprotein-cholesterol (LDL-C) levels, as well as a significant increase in the high-density lipoprotein-cholesterol (HDLC) level in hyperlipidemic rats. However, treatment with the water (H(2)O) fraction did not exert any significant effects on the serum levels of hyperlipidemic rats. In addition, eckol and dieckol isolated from the active EtOAc fraction induced a significant reduction in serum TG, TC, and LDL-C levels, as well as in the atherogenic index (A.I.). Furthermore, treatment with dieckol induced a greater decrease in the serum TG, TC, and LDL-C levels of hyperlipidemic rats than eckol or lovastatin, as well as an increase in the serum HDL-C levels. Taken together, these results suggest that phlorotannins such as eckol and dieckol have the potential for use for the prevention of hyperlipidemic atherosclerosis.
Collapse
Affiliation(s)
- Na Young Yoon
- Division of Food Science and Biotechnology, Pukyong National University, Busan, 608-737, Korea
| | | | | | | |
Collapse
|