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Steele LA, Spiller KL, Cohen S, Rom S, Polyak B. Temporal Control over Macrophage Phenotype and the Host Response via Magnetically Actuated Scaffolds. ACS Biomater Sci Eng 2022; 8:3526-3541. [PMID: 35838679 DOI: 10.1021/acsbiomaterials.2c00373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic strain generated at the cell-material interface is critical for the engraftment of biomaterials. Mechanosensitive immune cells, macrophages regulate the host-material interaction immediately after implantation by priming the environment and remodeling ongoing regenerative processes. This study investigated the ability of mechanically active scaffolds to modulate macrophage function in vitro and in vivo. Remotely actuated magnetic scaffolds enhance the phenotype of murine classically activated (M1) macrophages, as shown by the increased expression of the M1 cell-surface marker CD86 and increased secretion of multiple M1 cytokines. When scaffolds were implanted subcutaneously into mice and treated with magnetic stimulation for 3 days beginning at either day 0 or day 5 post-implantation, the cellular infiltrate was enriched for host macrophages. Macrophage expression of the M1 marker CD86 was increased, with downstream effects on vascularization and the foreign body response. Such effects were not observed when the magnetic treatment was applied at later time points after implantation (days 12-15). These results advance our understanding of how remotely controlled mechanical cues, namely, cyclic strain, impact macrophage function and demonstrate the feasibility of using mechanically active nanomaterials to modulate the host response in vivo.
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Affiliation(s)
- Lindsay A Steele
- Department of Surgery, College of Medicine, Drexel University, 245 N. 15th Street, Philadelphia 19102, Pennsylvania, United States
| | - Kara L Spiller
- School of Biomedical Engineering, Science and Health Systems, Drexel University, 3141 Chestnut Street, Bossone 712, Philadelphia 19104, Pennsylvania, United States
| | - Smadar Cohen
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.,Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.,Regenerative Medicine and Stem Cell (RMSC) Research Center, Ben-Gurion University of the Negev, Beer Sheva Blvd. 1, Bldg. 42, Room 328, Beer-Sheva 84105, Israel
| | - Slava Rom
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia 19140, Pennsylvania, United States.,Center for Substance Abuse Research, Temple University, 3500 N. Broad Street, Medical Education and Research Building, Room 842, Philadelphia 19140, Pennsylvania, United States
| | - Boris Polyak
- Department of Surgery, College of Medicine, Drexel University, 245 N. 15th Street, Philadelphia 19102, Pennsylvania, United States
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2
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Jackson MR, Cox KD, Baugh SDP, Wakeen L, Rashad AA, Lam PYS, Polyak B, Jorns MS. Discovery of a first-in-class inhibitor of sulfide:quinone oxidoreductase that protects against adverse cardiac remodeling and heart failure. Cardiovasc Res 2021; 118:1771-1784. [PMID: 34132787 DOI: 10.1093/cvr/cvab206] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 06/14/2021] [Indexed: 12/27/2022] Open
Abstract
AIMS Hydrogen sulfide (H2S) is a potent signaling molecule that activates diverse cardioprotective pathways by posttranslational modification (persulfidation) of cysteine residues in upstream protein targets. Heart failure patients with reduced ejection fraction (HFrEF) exhibit low levels of H2S. Sulfide: quinone oxidoreductase (SQOR) catalyzes the first irreversible step in the metabolism of H2S and plays a key role in regulating H2S-mediated signaling. Our aim here was to discover a first-in-class inhibitor of human SQOR and evaluate its cardioprotective effect in an animal model of HFrEF. METHODS AND RESULTS We identified a potent inhibitor of human SQOR (STI1, IC50 = 29 nM) by high-throughput screening of a small-molecule library, followed by focused medicinal chemistry optimization and structure-based design. STI1 is a competitive inhibitor that binds with high selectivity to the coenzyme Q-binding pocket in SQOR. STI1 exhibited very low cytotoxicity and attenuated the hypertrophic response of neonatal rat ventricular cardiomyocytes and H9c2 cells induced by neurohormonal stressors. A mouse HFrEF model was produced by transverse aortic constriction (TAC). Treatment of TAC mice with STI1 mitigated the development of cardiomegaly, pulmonary congestion, dilatation of the left ventricle, and cardiac fibrosis and decreased the pressure gradient across the aortic constriction. Moreover, STI1 dramatically improved survival, preserved cardiac function, and prevented the progression to HFrEF by impeding the transition from compensated to decompensated left ventricle hypertrophy. CONCLUSION We demonstrate that the coenzyme Q-binding pocket in human SQOR is a druggable target and establish proof of concept for the potential of SQOR inhibitors to provide a novel therapeutic approach for the treatment of HFrEF. TRANSLATIONAL PERSPECTIVE In HFrEF there is a compelling need for new drugs that mitigate the pathological remodeling induced by injury and improve patient survival. This study identifies SQOR-inhibiting drugs as a promising first-in-class therapy for HFrEF patients. Due to the well-established protective properties of H2S-induced signaling in renal physiology and disease, this novel class of heart failure therapeutics may also address the large unmet need of therapies for approximately 50% of heart failure patients that have coexisting chronic renal dysfunction.
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Affiliation(s)
- Michael R Jackson
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Kristie D Cox
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Simon D P Baugh
- Fox Chase Chemical Diversity Center, Inc. Doylestown, PA, 18902, USA
| | - Luke Wakeen
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Adel A Rashad
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Patrick Y S Lam
- Fox Chase Chemical Diversity Center, Inc. Doylestown, PA, 18902, USA
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Marilyn Schuman Jorns
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
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3
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Bernstein DL, Zuluaga-Ramirez V, Gajghate S, Reichenbach NL, Polyak B, Persidsky Y, Rom S. miR-98 reduces endothelial dysfunction by protecting blood-brain barrier (BBB) and improves neurological outcomes in mouse ischemia/reperfusion stroke model. J Cereb Blood Flow Metab 2020; 40:1953-1965. [PMID: 31601141 PMCID: PMC7786850 DOI: 10.1177/0271678x19882264] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Most neurological diseases, including stroke, lead to some degree of blood-brain barrier (BBB) dysfunction. A significant portion of BBB injury is caused by inflammation, due to pro-inflammatory factors produced in the brain, and by leukocyte engagement of the brain endothelium. Recently, microRNAs (miRNAs) have appeared as major regulators of inflammation-induced changes to gene expression in the microvascular endothelial cells (BMVEC) that comprise the BBB. However, miRNAs' role during cerebral ischemia/reperfusion is still underexplored. Endothelial levels of miR-98 were significantly altered following ischemia/reperfusion insults, both in vivo and in vitro, transient middle cerebral artery occlusion (tMCAO), and oxygen-glucose deprivation (OGD), respectively. Overexpression of miR-98 reduced the mouse's infarct size after tMCAO. Further, miR-98 lessened infiltration of proinflammatory Ly6CHI leukocytes into the brain following stroke and diminished the prevalence of M1 (activated) microglia within the impacted area. miR-98 attenuated BBB permeability, as demonstrated by changes to fluorescently-labeled dextran penetration in vivo and improved transendothelial electrical resistance (TEER) in vitro. Treatment with miR-98 improved significantly the locomotor impairment. Our study provides identification and functional assessment of miRNAs in brain endothelium and lays the groundwork for improving therapeutic approaches for patients suffering from ischemic attacks.
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Affiliation(s)
- David L Bernstein
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, USA
| | | | - Sachin Gajghate
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, USA
| | - Nancy L Reichenbach
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, USA
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, PA, USA
| | - Yuri Persidsky
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, USA.,Center for Substance Abuse Research, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Slava Rom
- Department of Pathology and Laboratory Medicine, Temple University, Philadelphia, PA, USA.,Center for Substance Abuse Research, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
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4
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Thadi A, Lewis L, Goldstein E, Aggarwal A, Khalili M, Steele L, Polyak B, Seydafkan S, Bluth MH, Ward KA, Styler M, Campbell PM, Pincus MR, Bowne WB. Targeting Membrane HDM-2 by PNC-27 Induces Necrosis in Leukemia Cells But Not in Normal Hematopoietic Cells. Anticancer Res 2020; 40:4857-4867. [PMID: 32878773 DOI: 10.21873/anticanres.14488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/18/2020] [Accepted: 06/20/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM Anticancer peptide PNC-27 binds to HDM-2 protein on cancer cell membranes inducing the formation of cytotoxic transmembrane pores. Herein, we investigated HDM-2 membrane expression and the effect of PNC-27 treatment on human non-stem cell acute myelogenous leukemia cell lines: U937, acute monocytic leukemia; OCI-AML3, acute myelomonocytic leukemia and HL60, acute promyelocytic leukemia. MATERIALS AND METHODS We measured cell surface membrane expression of HDM-2 using flow cytometry. Cell viability was assessed using MTT assay while direct cytotoxicity was measured by lactate dehydrogenase (LDH) release and induction of apoptotic markers annexin V and caspase-3. RESULTS HDM-2 is expressed at high levels in membranes of U937, OCI-AML3 and HL-60 cells. PNC-27 can bind to membrane HDM-2 to induce cell necrosis and LDH release within 4 h. CONCLUSION Targeting membrane HDM-2 can be a potential strategy to treat leukemia. PNC-27 targeting membrane HDM-2 demonstrated significant anti-leukemia activity in a variety of leukemic cell lines.
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Affiliation(s)
- Anusha Thadi
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Lauren Lewis
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Eve Goldstein
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Anshu Aggarwal
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Marian Khalili
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Lindsay Steele
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Boris Polyak
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A
| | - Shabnam Seydafkan
- Department of Pathology and Laboratory Medicine, SUNY Downstate Medical Center, Brooklyn, NY, U.S.A
| | - Martin H Bluth
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, U.S.A
| | - Kristine A Ward
- Department of Hematology and Oncology, Leukemia Program, University of Pennsylvania, Philadelphia, PA, U.S.A
| | - Michael Styler
- Department of Hematology and Oncology, Bone Marrow Transplant Program, Fox Chase Cancer Center, Philadelphia, PA, U.S.A
| | - Paul M Campbell
- The Marvin and Concetta Greenberg Pancreatic Cancer Institute, Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, U.S.A
| | - Matthew R Pincus
- Department of Pathology and Laboratory Medicine, SUNY Downstate Medical Center, Brooklyn, NY, U.S.A.
| | - Wilbur B Bowne
- Division of Surgical Oncology, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, U.S.A. .,Department of Surgery, Thomas Jefferson University, Sidney Kimmel Medical College, Philadelphia, PA, U.S.A
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Han H, Eyal S, Portnoy E, Mann A, Shmuel M, Benifla M, Ekstein D, Polyak B. Monocytes as Carriers of Magnetic Nanoparticles for Tracking Inflammation in the Epileptic Rat Brain. Curr Drug Deliv 2019; 16:637-644. [DOI: 10.2174/1567201816666190619122456] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 02/14/2019] [Accepted: 05/29/2019] [Indexed: 12/14/2022]
Abstract
Background:
Inflammation is a hallmark of epileptogenic brain tissue. Previously, we have
shown that inflammation in epilepsy can be delineated using systemically-injected fluorescent and magnetite-
laden nanoparticles. Suggested mechanisms included distribution of free nanoparticles across a
compromised blood-brain barrier or their transfer by monocytes that infiltrate the epileptic brain.
Objective:
In the current study, we evaluated monocytes as vehicles that deliver nanoparticles into the
epileptic brain. We also assessed the effect of epilepsy on the systemic distribution of nanoparticleloaded
monocytes.
Methods:
The in vitro uptake of 300-nm nanoparticles labeled with magnetite and BODIPY (for optical
imaging) was evaluated using rat monocytes and fluorescence detection. For in vivo studies we used the
rat lithium-pilocarpine model of temporal lobe epilepsy. In vivo nanoparticle distribution was evaluated
using immunohistochemistry.
Results:
89% of nanoparticle loading into rat monocytes was accomplished within 8 hours, enabling
overnight nanoparticle loading ex vivo. The dose-normalized distribution of nanoparticle-loaded monocytes
into the hippocampal CA1 and dentate gyrus of rats with spontaneous seizures was 176-fold and
380-fold higher compared to the free nanoparticles (p<0.05). Seizures were associated with greater
nanoparticle accumulation within the liver and the spleen (p<0.05).
Conclusion:
Nanoparticle-loaded monocytes are attracted to epileptogenic brain tissue and may be used
for labeling or targeting it, while significantly reducing the systemic dose of potentially toxic compounds.
The effect of seizures on monocyte biodistribution should be further explored to better
understand the systemic effects of epilepsy.
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Affiliation(s)
- Hadas Han
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Sara Eyal
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Emma Portnoy
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Aniv Mann
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Miriam Shmuel
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Mony Benifla
- Pediatric Neurosurgery Unit, Rambam Health Care Campus, Haifa, Israel
| | - Dana Ekstein
- Department of Neurology, Agnes Ginges Center for Human Neurogenetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Boris Polyak
- Department of Surgery and Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania, United States
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6
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Khalili M, Zhou H, Thadi A, Daniels L, Fan Z, Morano WF, Ang J, Goldstein E, Polyak B, Mapow BC, Cheng H, Bowne WB. Slippery Nanoparticles as a Diffusion Platform for Mucin Producing Gastrointestinal Tumors. Ann Surg Oncol 2019; 27:76-84. [PMID: 31187366 DOI: 10.1245/s10434-019-07493-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Indexed: 11/18/2022]
Abstract
BACKGROUND Treatment failure in pseudomyxoma peritonei (PMP) is partly attributed to the ineffective delivery of therapeutics through dense mucinous tumor barriers. We modified the surface of Poly (lactic-co-glycolic acid)-b-polyethylene glycol (PLGA-PEG-NPs) with a low-density, second PEG layer (PLGA-TPEG-NPs-20) to reduce their binding affinity to proteins and improve diffusion through mucin. METHODS Nanoprecipitation was used to fabricate PLGA-PEG-NPs. To construct the second PEG layer of PLGA-TPEG-NPs-20, PEG-Thiol was conjugated to PLGA-PEG-NPs composed of 80% methoxy PLGA-PEG and 20% of PLGA-PEG-Maleimide. DiD-labeled nanoparticles (NPs) were added to the inner well of a trans-well system containing cultured LS174T or human PMP tissue. Diffusion of NPs was measured via fluorescence signal in the bottom well. In an ex vivo rat model, small intestine was treated with DiD-labeled NPs. In an in vivo murine LS174T subcutaneous tumor model, Nu/Nu nude mice received supratumoral injections (subcutaneous injection above the tumor) of DiD-labeled NPs. Thirty minutes after injection, mice were sacrificed, and tumors were collected. All tissue was cryosectioned, mounted with DAPI-containing media, and inspected via confocal microscopy. RESULTS Diffusion profiles of NPs through PMP and cultured LS174T cells were generated. PLGA-TPEG-NPs-20 diffused faster with ~ 100% penetration versus PLGA-PEG-NPs with ~ 40% penetration after 8 h. Increased diffusion of PLGA-TPEG-NPs-20 was further observed in ex vivo rat small intestine as evidenced by elevated luminal NP fluorescence signal on the luminal surface. Subcutaneous LS174T tumors treated with PLGA-TPEG-NPs-20 demonstrated greater diffusion of NPs, showing homogenous fluorescence signal throughout the tumor. CONCLUSIONS PLGA-TPEG-NPs-20 can be an effective mucin penetrating drug delivery system.
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Affiliation(s)
- Marian Khalili
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Hao Zhou
- Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA
| | - Anusha Thadi
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Lynsey Daniels
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Zhiyuan Fan
- Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA
| | - William F Morano
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Joanne Ang
- Department of Pathology, Drexel University, Philadelphia, PA, USA
| | - Eve Goldstein
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Beth C Mapow
- Department of Pathology, Drexel University, Philadelphia, PA, USA
| | - Hao Cheng
- Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA.,School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA, USA
| | - Wilbur B Bowne
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA.
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Abstract
Nano- and microscale topographical cues have become recognized as major regulators of cell growth, migration, and phenotype. In tissue engineering, the complex and anisotropic architecture of culture platforms is aimed to imitate the high degree of spatial organization of the extracellular matrix and basement membrane components. Here, we developed a method of creating a novel, magnetically aligned, three-dimensional (3D) tissue culture matrix with three distinct classes of anisotropy-surface topography, microstructure, and physical properties. Alginate-stabilized magnetic nanoparticles (MNPs) were added to a cross-linked alginate solution, and an external magnetic field of about 2400 G was applied during freezing to form the aligned macroporous scaffold structure. The resultant scaffold exhibited anisotropic topographic features on the submicron scale, the directionality of the pore shape, and increased scaffold stiffness in the direction of magnetic alignment. These scaffold features were modulated by an alteration in the impregnated MNP size and concentration, as quantified by electron microscopy, advanced image processing analyses, and rheological methods. Mouse myoblasts (C2C12) cultured on the magnetically aligned scaffolds, demonstrated co-oriented morphology in the direction of the magnetic alignment. In summary, magnetic alignment introduces several degrees of anisotropy in the scaffold structure, providing diverse mechanical cues that can affect seeded cells and further tissue development. Multiscale anisotropy together with the capability of the MNP-containing alginate scaffolds to undergo reversible shape deformation in an oscillating magnetic field creates interesting opportunities for multifarious stimulation of cells and functional tissue development.
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Affiliation(s)
- Gal Margolis
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering , Ben-Gurion University of the Negev , Beer-Sheva 8410501 , Israel
| | - Boris Polyak
- Department of Surgery, Pharmacology, and Physiology , Drexel University , Philadelphia , Pennsylvania 19102 , United States
| | - Smadar Cohen
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering , Ben-Gurion University of the Negev , Beer-Sheva 8410501 , Israel
- The Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of the Negev , Beer-Sheva 8410501 , Israel
- Regenerative Medicine and Stem Cell (RMSC) Research Center , Ben-Gurion University of the Negev , Beer-Sheva 8410501 , Israel
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Polyak B, Medved M, Lazareva N, Steele L, Patel T, Rai A, Rotenberg MY, Wasko K, Kohut AR, Sensenig R, Friedman G. Magnetic Nanoparticle-Mediated Targeting of Cell Therapy Reduces In-Stent Stenosis in Injured Arteries. ACS Nano 2016; 10:9559-9569. [PMID: 27622988 DOI: 10.1021/acsnano.6b04912] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Although drug-eluting stents have dramatically reduced the recurrence of restenosis after vascular interventions, the nonselective antiproliferative drugs released from these devices significantly delay reendothelialization and vascular healing, increasing the risk of short- and long-term stent failure. Efficient repopulation of endothelial cells in the vessel wall following injury may limit complications, such as thrombosis, neoatherosclerosis, and restenosis, through reconstitution of a luminal barrier and cellular secretion of paracrine factors. We assessed the potential of magnetically mediated delivery of endothelial cells (ECs) to inhibit in-stent stenosis induced by mechanical injury in a rat carotid artery stent angioplasty model. ECs loaded with biodegradable superparamagnetic nanoparticles (MNPs) were administered at the distal end of the stented artery and localized to the stent using a brief exposure to a uniform magnetic field. After two months, magnetic localization of ECs demonstrated significant protection from stenosis at the distal part of the stent in the cell therapy group compared to both the proximal part of stent in the cell therapy group and the control (stented, nontreated) group: 1.7-fold (p < 0.001) less reduction in lumen diameter as measured by B-mode and color Doppler ultrasound, 2.3-fold (p < 0.001) less reduction in the ratios of peak systolic velocities as measured by pulsed wave Doppler ultrasound, and 2.1-fold (p < 0.001) attenuation of stenosis as determined through end point morphometric analysis. The study thus demonstrates that magnetically assisted delivery of ECs is a promising strategy for prevention of vessel lumen narrowing after stent angioplasty procedure.
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Affiliation(s)
- Boris Polyak
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
- Department of Pharmacology and Physiology, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Mikhail Medved
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Nina Lazareva
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Lindsay Steele
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
- Molecular Cell Biology and Genetics (MCBG) Program, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Tirth Patel
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Ahmad Rai
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Menahem Y Rotenberg
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
| | - Kimberly Wasko
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Andrew R Kohut
- Department of Medicine, Division of Cardiology, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
| | - Richard Sensenig
- Department of Surgery, Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Gary Friedman
- Department of Surgery, Drexel University College of Medicine , Philadelphia, Pennsylvania 19102, United States
- Department of Electrical and Computer Engineering, Drexel University , Philadelphia, Pennsylvania 19104, United States
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Orynbayeva Z, Sensenig R, Polyak B. Metabolic and structural integrity of magnetic nanoparticle-loaded primary endothelial cells for targeted cell therapy. Nanomedicine (Lond) 2016; 10:1555-68. [PMID: 26008193 DOI: 10.2217/nnm.15.14] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
AIM To successfully translate magnetically mediated cell targeting from bench to bedside, there is a need to systematically assess the potential adverse effects of magnetic nanoparticles (MNPs) interacting with 'therapeutic' cells. Here, we examined in detail the effects of internalized polymeric MNPs on primary rat endothelial cells' structural intactness, metabolic integrity and proliferation potential. MATERIALS & METHODS The intactness of cytoskeleton and organelles was studied by fluorescent confocal microscopy, flow cytometry and high-resolution respirometry. RESULTS MNP-loaded primary endothelial cells preserve intact cytoskeleton and organelles, maintain normal rate of proliferation, calcium signaling and mitochondria energy metabolism. CONCLUSION This study provides supportive evidence that MNPs at doses necessary for targeting did not induce significant adverse effects on structural integrity and functionality of primary endothelial cells - potential cell therapy vectors.
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Affiliation(s)
- Zulfiya Orynbayeva
- 1Department of Surgery, Drexel University College of Medicine, Philadelphia, PA 19102, USA
| | - Richard Sensenig
- 2Department of Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Boris Polyak
- 1Department of Surgery, Drexel University College of Medicine, Philadelphia, PA 19102, USA
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10
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Zohra FT, Medved M, Lazareva N, Polyak B. Functional behavior and gene expression of magnetic nanoparticle-loaded primary endothelial cells for targeting vascular stents. Nanomedicine (Lond) 2016; 10:1391-406. [PMID: 25996117 DOI: 10.2217/nnm.15.13] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
AIM To assess functional competence and gene expression of magnetic nanoparticle (MNP)-loaded primary endothelial cells (ECs) as potential cell-based therapy vectors. MATERIALS & METHODS A quantitative tube formation, nitric oxide and adhesion assays were conducted to assess functional potency of the MNP-loaded ECs. A quantitative real-time PCR was used to profile genes in both MNP-loaded at static conditions and in vitro targeted ECs. RESULTS Functional behavior of MNP-loaded and unloaded cells was comparable. MNPs induce expression of genes involved in EC growth and survival, while repress genes involved in coagulation. CONCLUSION MNPs do not adversely affect cellular function. Gene expression indicates that targeting MNP-loaded ECs to vascular stents may potentially stimulate re-endothelialization of an implant and attenuate neointimal hyperplasia.
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Affiliation(s)
- Fatema Tuj Zohra
- 1Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, NCB Suite 7150, Mail Stop 413, Philadelphia, PA 19102, USA
| | - Mikhail Medved
- 1Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, NCB Suite 7150, Mail Stop 413, Philadelphia, PA 19102, USA
| | - Nina Lazareva
- 1Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, NCB Suite 7150, Mail Stop 413, Philadelphia, PA 19102, USA
| | - Boris Polyak
- 1Department of Surgery, Drexel University College of Medicine, 245 North 15th Street, NCB Suite 7150, Mail Stop 413, Philadelphia, PA 19102, USA
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Sapir-Lekhovitser Y, Rotenberg MY, Jopp J, Friedman G, Polyak B, Cohen S. Magnetically actuated tissue engineered scaffold: insights into mechanism of physical stimulation. Nanoscale 2016; 8:3386-3399. [PMID: 26790538 PMCID: PMC4772769 DOI: 10.1039/c5nr05500h] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Providing the right stimulatory conditions resulting in efficient tissue promoting microenvironment in vitro and in vivo is one of the ultimate goals in tissue development for regenerative medicine. It has been shown that in addition to molecular signals (e.g. growth factors) physical cues are also required for generation of functional cell constructs. These cues are particularly relevant to engineering of biological tissues, within which mechanical stress activates mechano-sensitive receptors, initiating biochemical pathways which lead to the production of functionally mature tissue. Uniform magnetic fields coupled with magnetizable nanoparticles embedded within three dimensional (3D) scaffold structures remotely create transient physical forces that can be transferrable to cells present in close proximity to the nanoparticles. This study investigated the hypothesis that magnetically responsive alginate scaffold can undergo reversible shape deformation due to alignment of scaffold's walls in a uniform magnetic field. Using custom made Helmholtz coil setup adapted to an Atomic Force Microscope we monitored changes in matrix dimensions in situ as a function of applied magnetic field, concentration of magnetic particles within the scaffold wall structure and rigidity of the matrix. Our results show that magnetically responsive scaffolds exposed to an externally applied time-varying uniform magnetic field undergo a reversible shape deformation. This indicates on possibility of generating bending/stretching forces that may exert a mechanical effect on cells due to alternating pattern of scaffold wall alignment and relaxation. We suggest that the matrix structure deformation is produced by immobilized magnetic nanoparticles within the matrix walls resulting in a collective alignment of scaffold walls upon magnetization. The estimated mechanical force that can be imparted on cells grown on the scaffold wall at experimental conditions is in the order of 1 pN, which correlates well with reported threshold to induce mechanotransduction effects on cellular level. This work is our next step in understanding of how to accurately create proper stimulatory microenvironment for promotion of cellular organization to form mature tissue engineered constructs.
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Affiliation(s)
- Yulia Sapir-Lekhovitser
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Menahem Y. Rotenberg
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Juergen Jopp
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Gary Friedman
- Department of Surgery, Drexel University College of Medicine, Philadelphia PA 19102, USA
- Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA 19104, USA
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, Philadelphia PA 19102, USA
- Department of Pharmacology and Physiology, Drexel University, Philadelphia, PA 19102, USA
| | - Smadar Cohen
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Center for Regenerative Medicine and Stem Cell (RMSC) Research, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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Affiliation(s)
- Boris Polyak
- Laboratory of Magnetic Drug Targeting, Department of Surgery & Department of Pharmacology & Physiology, Drexel University, College of Medicine, Philadelphia, PA 19102, USA
| | - Bernardo Cordovez
- Co-founder & President, Optofluidics, Inc., Philadelphia, PA 19104, USA
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Tickle JA, Jenkins SI, Polyak B, Pickard MR, Chari DM. Endocytotic potential governs magnetic particle loading in dividing neural cells: studying modes of particle inheritance. Nanomedicine (Lond) 2016; 11:345-58. [PMID: 26785794 DOI: 10.2217/nnm.15.202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIM To achieve high and sustained magnetic particle loading in a proliferative and endocytotically active neural transplant population (astrocytes) through tailored magnetite content in polymeric iron oxide particles. MATERIALS & METHODS MPs of varying magnetite content were applied to primary-derived rat cortical astrocytes ± static/oscillating magnetic fields to assess labeling efficiency and safety. RESULTS Higher magnetite content particles display high but safe accumulation in astrocytes, with longer-term label retention versus lower/no magnetite content particles. Magnetic fields enhanced loading extent. Dynamic live cell imaging of dividing labeled astrocytes demonstrated that particle distribution into daughter cells is predominantly 'asymmetric'. CONCLUSION These findings could inform protocols to achieve efficient MP loading into neural transplant cells, with significant implications for post-transplantation tracking/localization.
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Affiliation(s)
- Jacqueline A Tickle
- Institute for Science & Technology in Medicine, School of Medicine, David Weatherall Building, Keele University, Staffordshire, ST5 5BG, UK
| | - Stuart I Jenkins
- Institute for Science & Technology in Medicine, School of Medicine, David Weatherall Building, Keele University, Staffordshire, ST5 5BG, UK
| | - Boris Polyak
- Department of Surgery & Department of Pharmacology & Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, USA
| | - Mark R Pickard
- Institute for Science & Technology in Medicine, School of Medicine, David Weatherall Building, Keele University, Staffordshire, ST5 5BG, UK
| | - Divya M Chari
- Institute for Science & Technology in Medicine, School of Medicine, David Weatherall Building, Keele University, Staffordshire, ST5 5BG, UK
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Adams CF, Rai A, Sneddon G, Yiu HH, Polyak B, Chari DM. Increasing magnetite contents of polymeric magnetic particles dramatically improves labeling of neural stem cell transplant populations. Nanomedicine: Nanotechnology, Biology and Medicine 2015; 11:19-29. [DOI: 10.1016/j.nano.2014.07.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 06/04/2014] [Accepted: 07/10/2014] [Indexed: 01/23/2023]
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Abstract
Cardiac tissue engineering offers new possibilities for the functional and structural restoration of damaged or lost heart tissue by applying cardiac patches created in vitro. Engineering such functional cardiac patches is a complex mission, involving material design on the nano- and microscale as well as the application of biological cues and stimulation patterns to promote cell survival and organization into a functional cardiac tissue. Herein, we present a novel strategy for creating a functional cardiac patch by combining the use of a macroporous alginate scaffold impregnated with magnetically responsive nanoparticles (MNPs) and the application of external magnetic stimulation. Neonatal rat cardiac cells seeded within the magnetically responsive scaffolds and stimulated by an alternating magnetic field of 5 Hz developed into matured myocardial tissue characterized by anisotropically organized striated cardiac fibers, which preserved its features for longer times than non-stimulated constructs. A greater activation of AKT phosphorylation in cardiac cell constructs after applying a short-term (20 min) external magnetic field indicated the efficacy of magnetic stimulation to actuate at a distance and provided a possible mechanism for its action. Our results point to a synergistic effect of magnetic field stimulation together with nanoparticulate features of the scaffold surface as providing the regenerating environment for cardiac cells driving their organization into functionally mature tissue.
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Affiliation(s)
- Yulia Sapir
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, Philadelphia PA 19102, USA
- Department of Pharmacology and Physiology, Drexel University, Philadelphia, PA 19102, USA
| | - Smadar Cohen
- The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Center for Regenerative Medicine and Stem Cell (RMSC) Research, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer- Sheva 84105, Israel
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Sapir Y, Ruvinov E, Polyak B, Cohen S. Magnetically actuated alginate scaffold: a novel platform for promoting tissue organization and vascularization. Methods Mol Biol 2014; 1181:83-95. [PMID: 25070329 DOI: 10.1007/978-1-4939-1047-2_8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Among the greatest hurdles hindering the successful implementation of tissue-engineered cardiac patch as a therapeutic strategy for myocardial repair is the know-how to promote its rapid integration into the host. We previously demonstrated that prevascularization of the engineered cardiac patch improves cardiac repair after myocardial infarction (MI); the mature vessel networks were generated by including affinity-bound angiogenic factors in the patch and its transplantation on the blood vessel-enriched omentum. Here, we describe a novel in vitro strategy to promote the formation of capillary-like networks in cell constructs without supplementing with angiogenic factors. Endothelial cells (ECs) were seeded into macroporous alginate scaffolds impregnated with magnetically responsive nanoparticles (MNPs), and after pre-culture for 24 h under standard conditions the constructs were subjected to an alternating magnetic field of 40 Hz for 7 days. The magnetic stimulation per se promoted EC organization into capillary-like structures with no supplementation of angiogenic factors; in the non-stimulated constructs, the cells formed sheets or aggregates. This chapter describes in detail the preparation method of the MNP-impregnated alginate scaffold, the cultivation setup for the cell construct under magnetic field conditions, and the set of analyses performed to characterize the resultant cell constructs.
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Affiliation(s)
- Yulia Sapir
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
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Sensenig R, Sapir Y, MacDonald C, Cohen S, Polyak B. Magnetic nanoparticle-based approaches to locally target therapy and enhance tissue regeneration in vivo. Nanomedicine (Lond) 2013; 7:1425-42. [PMID: 22994959 DOI: 10.2217/nnm.12.109] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Magnetic-based systems utilizing superparamagnetic nanoparticles and a magnetic field gradient to exert a force on these particles have been used in a wide range of biomedical applications. This review is focused on drug targeting applications that require penetration of a cellular barrier as well as strategies to improve the efficacy of targeting in these biomedical applications. Another focus of this review is regenerative applications utilizing tissue engineered scaffolds prepared with the aid of magnetic particles, the use of remote actuation for release of bioactive molecules and magneto-mechanical cell stimulation, cell seeding and cell patterning.
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Affiliation(s)
- Richard Sensenig
- Department of Surgery, Drexel University College of Medicine, PA 19102, USA
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Dobretsov G, Polyak B, Smolina N, Babushkina T, Syrejshchikova T, Klimova T, Sverbil V, Peregudov A, Gryzunov Y, Sarkisov O. Interaction of a fluorescent probe, CAPIDAN, with human serum albumin. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2012.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Konry T, Bale SS, Bhushan A, Shen K, Seker E, Polyak B, Yarmush M. Particles and microfluidics merged: perspectives of highly sensitive diagnostic detection. Mikrochim Acta 2011; 176:251-269. [PMID: 25378716 DOI: 10.1007/s00604-011-0705-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
There is a growing need for diagnostic technologies that provide laboratories with solutions that improve quality, enhance laboratory system productivity, and provide accurate detection of a broad range of infectious diseases and cancers. Recent advances in micro- and nanoscience and engineering, in particular in the areas of particles and microfluidic technologies, have advanced the "lab-on-a-chip" concept towards the development of a new generation of point-of-care diagnostic devices that could significantly enhance test sensitivity and speed. In this review, we will discuss many of the recent advances in microfluidics and particle technologies with an eye towards merging these two technologies for application in medical diagnostics. Although the potential diagnostic applications are virtually unlimited, the most important applications are foreseen in the areas of biomarker research, cancer diagnosis, and detection of infectious microorganisms.
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Affiliation(s)
- Tania Konry
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School and the Shriners Hospitals for Children, 51 Blossom St., Boston 02114 MA, USA
| | - Shyam Sundhar Bale
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School and the Shriners Hospitals for Children, 51 Blossom St., Boston 02114 MA, USA
| | - Abhinav Bhushan
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School and the Shriners Hospitals for Children, 51 Blossom St., Boston 02114 MA, USA
| | - Keyue Shen
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School and the Shriners Hospitals for Children, 51 Blossom St., Boston 02114 MA, USA
| | - Erkin Seker
- Department of Electrical and Computer Engineering, University of California, Davis, 3177 Kemper Hall, Davis, CA 95616, USA
| | - Boris Polyak
- Department of Surgery, Drexel University College of Medicine, Philadelphia, PA 19102, USA
| | - Martin Yarmush
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School and the Shriners Hospitals for Children, 51 Blossom St., Boston 02114 MA, USA
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Johnson B, Toland B, Chokshi R, Mochalin V, Koutzaki S, Polyak B. Magnetically responsive paclitaxel-loaded biodegradable nanoparticles for treatment of vascular disease: preparation, characterization and in vitro evaluation of anti-proliferative potential. Curr Drug Deliv 2010; 7:263-73. [PMID: 20695837 DOI: 10.2174/156720110793360621] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2010] [Accepted: 05/10/2010] [Indexed: 11/22/2022]
Abstract
Long term prevention of smooth muscle cell migration and proliferation inside the lumen of coronary arteries after stent implantation remains a challenge in medicine. Vascular stents have been coated with anti-proliferative drugs such as paclitaxel and rapamycin to improve the stents' efficacy. Maintaining adequate drug concentration on coronary stents presents an obstacle which magnetic nanoparticle (MNP) drug delivery could potentially overcome. Biodegradable, super-paramagnetic nanoparticles guided by high gradient magnetic fields have been proposed as transport vehicles for re-dosing stents with anti-proliferative drugs. The current study determined the characteristics of a number of candidate MNP formulations in terms of their size, surface charge, efficiency of magnetite and drug loadings, drug release profiles as well as their anti-proliferative effect on the relevant vascular cells. MNPs containing near 30% (w/w) magnetite and 12% (w/w) paclitaxel were formulated from polylactide and poly(lactide-co-glycolide) polymers using an emulsification-solvent evaporation methodology. Drug release patterns correlated well with cell growth inhibition in cultured aortic smooth muscle cells and bovine aortic endothelial cells treated with varying MNP doses. Cell viability assays revealed MNP dose-dependent cell growth inhibition over an 8-day time span for paclitaxel-loaded formulations resulting in near 80% and 100% of cell growth arrest in cultured vascular smooth muscle cells and endothelial cells respectively, while unloaded with drug formulations showed negligible variation from the non treated cells. It is concluded, that biodegradable polymeric superparamagnetic nanoparticles loaded with a relatively high level of magnetite and drug could serve as efficient carriers in vascular stent targeting applications and potentially allow re-dosing the depleted stents, thereby prolonging the lifecycle of the implant.
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MacDonald C, Friedman G, Alamia J, Barbee K, Polyak B. Time-varied magnetic field enhances transport of magnetic nanoparticles in viscous gel. Nanomedicine (Lond) 2010; 5:65-76. [PMID: 20025465 DOI: 10.2217/nnm.09.97] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM The potential of magnetic nanoparticles (MNPs) to deliver various forms of therapy has not been fully realized, in part due to difficulties in transporting the carriers through soft tissue to different target sites. The aim of this study was to demonstrate that transport of MNPs through a viscous gel can be controlled by a combined AC (time-varying) magnetic field and static field gradient. MATERIALS & METHODS MNP velocity and transport efficiency were measured in a viscous gel at various settings of magnetic field and magnetite loadings. RESULTS Combined application of an AC magnetic field with the static field gradient resulted in a nearly 30-fold increase in MNP transport efficiency in viscous gel for 30% (w/w) magnetite-loaded particles as compared with static field conditions. CONCLUSION The 'oscillating' effect of an AC magnetic field greatly improves the ability to transport MNPs within soft media by decreasing the effective viscosity of the gel.
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Affiliation(s)
- Cristin MacDonald
- School of Biomedical Engineering, Drexel University Philadelphia, PA 19104, USA
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Abstract
BACKGROUND Magnetic vehicles are very attractive for delivery of therapeutic agents as they can be targeted to specific locations in the body through the application of a magnetic field gradient. The magnetic localization of a therapeutic agent results in the concentration of the therapy at the target site consequently reducing or eliminating the systemic drug side effects. OBJECTIVE The aim of this review is to provide an update on the progress made in the development of the magnetic targeting technique addressing characteristics of the magnetic carriers and limitations of the current targeting magnet systems. METHODS This review discusses fundamental requirements for the optimal formulation of the magnetic carrier, current applications and potentially new approaches for the magnetically mediated, site-specific localization of therapeutic agents, including drugs, genes and cells. RESULTS/CONCLUSION More efficient targeting magnetic systems in combination with prolonged circulation lifespan and carriers' surface recognition properties will improve the targeting efficiency of magnetic nanocarriers and enhance therapeutic agent availability at the molecular site of agent action. The main future magnetic targeting applications were categorized emphasizing the most promising directions and possible strategies for improving the magnetic targeting technique.
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Abstract
Targeting gene therapy remains a challenge. The use of magnetic force to achieve this was investigated in the present study. It was hypothesized that nanoparticles with both controllable particle size and magnetic properties would enable magnetically driven gene delivery. We investigated this hypothesis by creating a family of novel biodegradable polymeric superparamagnetic nanoparticle (MNP) formulations. Polylactide MNP were formulated using a modified emulsification-solvent evaporation methodology with both the incorporation of oleate-coated iron oxide and a polyethylenimine (PEI) oleate ion-pair surface modification for DNA binding. MNP size could be controlled by varying the proportion of the tetrahydrofuran cosolvent. Magnetically driven MNP-mediated gene transfer was studied using a green fluorescent protein reporter plasmid in cultured arterial smooth muscle cells and endothelial cells. MNP-DNA internalization and trafficking were examined by confocal microscopy. Cell growth inhibition after MNP-mediated adiponectin plasmid transfection was studied as an example of a therapeutic end point. MNP-DNA complexes protected DNA from degradation and efficiently transfected quiescent cells under both low and high serum conditions after a 15 min exposure to a magnetic field (500 G). There was negligible transfection with MNP in the absence of a magnetic field. Larger sized MNP (375 nm diameter) exhibited higher transfection rates compared with 185 nm- and 240 nm-sized MNP. Internalized larger sized MNP escaped lysosomal localization and released DNA in the perinuclear zone. Adiponectin plasmid DNA delivery using MNP resulted in a dose-dependent growth inhibition of cultured arterial smooth muscle cells. It is concluded that magnetically driven plasmid DNA delivery can be achieved using biodegradable MNP containing oleate-coated magnetite and surface modified with PEI oleate ion-pair complexes that enable DNA binding.
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Affiliation(s)
- Michael Chorny
- Division of Cardiology Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Boris Polyak
- Division of Cardiology Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Ivan S. Alferiev
- Division of Cardiology Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Kenneth Walsh
- The Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Gary Friedman
- Drexel University School of Biomedical Engineering and Health Sciences, Philadelphia, Pennsylvania, USA
| | - Robert J. Levy
- Division of Cardiology Research, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Correspondence: The Children’s Hospital of Philadelphia, Abramson Research Bldg., Ste. 702, 3615 Civic Center Blvd., Philadelphia, PA 19104-4318, USA.
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Ivask A, Green T, Polyak B, Mor A, Kahru A, Virta M, Marks R. Fibre-optic bacterial biosensors and their application for the analysis of bioavailable Hg and As in soils and sediments from Aznalcollar mining area in Spain. Biosens Bioelectron 2007; 22:1396-402. [PMID: 16889954 DOI: 10.1016/j.bios.2006.06.019] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2006] [Revised: 06/06/2006] [Accepted: 06/15/2006] [Indexed: 11/18/2022]
Abstract
Fibre-optic biosensors for Hg and As were developed by attaching alginate-immobilised recombinant luminescent Hg- and As-sensor bacteria onto optical fibres. The optimised biosensors (consisting of seven layers of fibre-attached bacteria pre-grown till mid-logarithmic growth phase) enabled quantification of environmentally relevant concentrations of the target analytes: 2.6 microg l-1 of Hg(II) and 141 microg l-1 of As(V) or 18 microg l-1 of As(III). The highest viability and sensitivity for target analyte was obtained when fibre tips were stored in CaCl2 solution at -80 degrees C. Applicability of the fibre-optic biosensors in parallel to the respective non-immobilised sensors was assessed on 10 natural soil and sediment samples from Aznalcollar mining area (Spain). On the average 0.2% of the total Hg and 0.87% of the total As proved bioavailable to fibre-attached bacteria. Interestingly, about 20-fold more Hg and 4-fold more As was available to non-immobilised sensor bacteria indicating the importance of direct cell contact (possible only for non-immobilised cells) for enhanced bioavailability of these metals in solid samples.
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Affiliation(s)
- Angela Ivask
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia.
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Polyak B, Chorny M, Alferiev I, Walsh K, Friedman G, Levy RJ. 547. Magnetically Driven Non-Viral Gene Delivery Efficiently Transfects Cultured Smooth Muscle Cells and Inhibits Their Growth Via Adiponectin Transgene Expression. Mol Ther 2006. [DOI: 10.1016/j.ymthe.2006.08.619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Abu-Rabeah K, Polyak B, Ionescu RE, Cosnier S, Marks RS. Synthesis and Characterization of a Pyrrole−Alginate Conjugate and Its Application in a Biosensor Construction. Biomacromolecules 2005; 6:3313-8. [PMID: 16283760 DOI: 10.1021/bm050339j] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
N-(3-Aminopropyl)pyrrole was covalently coupled with alginate in an aqueous-phase reaction by means of carbodiimide-mediated activation chemistry to provide a pyrrole-alginate conjugate for subsequent use in biosensor applications. The pyrrole-alginate conjugate was quantified by UV spectroscopy at 230 nm, by an HPSEC-MALLS analytical method, as well as by FTIR and 13C NMR spectroscopies. The new pyrrole-alginate conjugate was used for the immobilization of polyphenol oxidase (PPO) onto an electrode surface by physical entrapment resulting from the gellification process and electrochemical polymerization of the pyrrole groups. The efficiency of this cross-linking approach (chemical and electrochemical) was investigated by comparing the amount of enzyme released from polypyrrole-alginate and regular alginate. In addition, biosensors were prepared by entrapment of the PPO in polypyrrole-alginate and regular alginate matrixes and their performance for the amperometric determination of catechol chosen as a model analyte was examined, yielding a sensitivity of 350 and 80 microA M(-1) cm(-2), respectively, for polypyrrole-alginate and alginate biosensors.
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Affiliation(s)
- Khalil Abu-Rabeah
- The National Institute for Biotechnology in the Negev and Department of Biotechnology Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
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Abstract
A panel of Escherichia coli strains harbouring different stress-responsive promoters fused to a lux reporter system was used to assess the potential toxicity of 17 unknown model water samples. Using liquid cultures, nine out of 14 toxic samples were properly identified as toxic, whereas five were false negatives. All three non-toxic controls were identified correctly (no false positives). Two strains containing promoter-lux fusions were also tested when immobilized onto fibre-optic tips. One genotoxic sample and six toxic samples were correctly identified in this manner. The potential advantages and limitations in the use of genetically engineered bacteria as biosensors for water toxicity are discussed in view of these results.
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Affiliation(s)
- R Pedahzur
- Division of Environmental Sciences, The Fredy and Nadine Herrmann Graduate School of Applied Science, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
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Cosnier S, Mousty C, de?Melo J, Lepellec A, Novoa A, Polyak B, Marks R. Organic Phase PPO Biosensors Prepared by Multilayer Deposition of Enzyme and Alginate Through Avidin-Biotin Interactions. ELECTROANAL 2004. [DOI: 10.1002/elan.200303084] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Shani Sekler M, Levi Y, Polyak B, Novoa A, Dunlop PSM, Byrne JA, Marks RS. Monitoring genotoxicity during the photocatalytic degradation ofp-nitrophenol. J Appl Toxicol 2004; 24:395-400. [PMID: 15478172 DOI: 10.1002/jat.1029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
p-Nitrophenol is a common structural unit of many pesticides and was chosen as a model compound to monitor genotoxicity during photocatalytic degradation. The genotoxicity of p-nitrophenol (PNP) and its breakdown products was measured using a bioluminescent bacterial bioassay, Vitotox. The genotoxic potential decreased with the concomitant photocatalytic degradation of the parent PNP concentration. The rate of genotoxicity reduction was slower than the rate of removal of the parent PNP, due to the formation of genotoxic by-products. After 6 h of photocatalytic treatment the total genotoxicity was removed. These results indicate that bioassays can be used as a simple and highly sensitive method for monitoring the general toxicity of chemical pollutants before, during and after photocatalytic treatment or other destructive processes.
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Affiliation(s)
- M Shani Sekler
- Institute for Applied Biosciences, Ben-Gurion University, PO Box 653, Beer-Sheva 84105, Israel
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Polyak B, Geresh S, Marks RS. Synthesis and Characterization of a Biotin-Alginate Conjugate and Its Application in a Biosensor Construction. Biomacromolecules 2004; 5:389-96. [PMID: 15002998 DOI: 10.1021/bm034454a] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biotin was covalently coupled with alginate in an aqueous-phase reaction by means of carbodiimide-mediated activation chemistry to provide a biotin-alginate conjugate for subsequent use in biosensor applications. The synthetic procedure was optimized with respect to pH of the reaction medium (pH 6.0), the degree of uronic acid activation (20%), and the order of addition of the reagents. The biotin-alginate conjugate was characterized by titration with 2-anilinonaphthalene-6-sulfonic acid (2,6-ANS), 4-hydroxyazobene-2'-carboxylic acid (HABA) and by an HPSEC-MALLS analytical method as well as by FTIR and 13C NMR spectroscopy. As a compromise between the need for a high percent of molar modification of the alginate, on one hand, and sufficient gelling capability, on the other hand, an optimal modification of 10-13% of biotin-alginate was used. The new biotin-alginate conjugate was used for the encapsulation of bioluminescent reporter cells into microspheres. A biosensor was prepared by conjugating these biotinylated alginate microspheres to the surface of a streptavidin-coated optical fiber, and the performance of the biosensor was demonstrated in the determination of the antibiotic, mitomycin C as a model toxin.
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Affiliation(s)
- Boris Polyak
- The Institute for Applied Biosciences and Department of Biotechnology Engineering, Ben-Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel
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Kleiner O, Ramesh J, Huleihel M, Cohen B, Kantarovich K, Levi C, Polyak B, Marks RS, Mordehai J, Cohen Z, Mordechai S. A comparative study of gallstones from children and adults using FTIR spectroscopy and fluorescence microscopy. BMC Gastroenterol 2002; 2:3. [PMID: 11872150 PMCID: PMC65695 DOI: 10.1186/1471-230x-2-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2001] [Accepted: 02/11/2002] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Cholelithiasis is the gallstone disease (GSD) where stones are formed in the gallbladder. The main function of the gallbladder is to concentrate bile by the absorption of water and sodium. GSD has high prevalence among elderly adults. There are three major types of gallstones found in patients, White, Black and Brown. The major chemical component of white stones is cholesterol. Black and brown stones contain different proportions of cholesterol and bilirubin. The pathogenesis of gallstones is not clearly understood. Analysis of the chemical composition of gallstones using various spectroscopic techniques offers clues to the pathogenesis of gallstones. Recent years has seen an increasing trend in the number of cases involving children. The focus of this study is on the analysis of the chemical composition of gallstones from child and adult patients using spectroscopic methods. METHODS In this report, we present FTIR spectroscopic studies and fluorescence microscopic analysis of gallstones obtained from 67 adult and 21 child patients. The gallstones were removed during surgical operations at Soroka University Medical Center. RESULTS Our results show that black stones from adults and children are rich in bilirubin. Brown stones are composed of varying amounts of bilirubin and cholesterol. Green stones removed from an adult, which is rare, was found to be composed mainly of cholesterol. Our results also indicated that cholesterol and bilirubin could be the risk factors for gallstone formation in adults and children respectively. Fluorescence micrographs showed that the Ca-bilirubinate was present in all stones in different quantities and however, Cu-bilirubinate was present only in the mixed and black stones. CONCLUSIONS Analysis based on FTIR suggest that the composition of black and brown stones from both children and adults are similar. Various layers of the brown stone from adults differ by having varying quantities of cholesterol and calcium carbonate. Ring patterns observed mainly in the green stone using fluorescence microscopy have relevance to the mechanism of the stone formation. Our preliminary study suggests that bilirubin and cholesterol are the main risk factors of gallstone disease.
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Affiliation(s)
- Oleg Kleiner
- Department of Pediatric Surgery, Soroka University Medical Center, Ben Gurion University, Beer Sheva 84101 Israel
| | | | - Mahmoud Huleihel
- The Institute for Applied Biosciences, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Beny Cohen
- Department of Chemistry, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Keren Kantarovich
- Department of Physics, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Chen Levi
- Department of Physics, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Boris Polyak
- The Institute for Applied Biosciences, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Robert S Marks
- The Institute for Applied Biosciences, Ben Gurion University, Beer Sheva, 84105, Israel
| | - Jacov Mordehai
- Department of Pediatric Surgery, Soroka University Medical Center, Ben Gurion University, Beer Sheva 84101 Israel
| | - Zahavi Cohen
- Department of Pediatric Surgery, Soroka University Medical Center, Ben Gurion University, Beer Sheva 84101 Israel
| | - Shaul Mordechai
- Department of Physics, Ben Gurion University, Beer Sheva, 84105, Israel
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