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Kilanski L, Jedrzejewski R, Sibera D, Kuryliszyn-Kudelska I, Gorantla S, Idczak R, Tran VH, Jedrzejewska A. Magnetic interactions in graphene decorated with iron oxide nanoparticles. Nanotechnology 2021; 32:305703. [PMID: 33789257 DOI: 10.1088/1361-6528/abf3ef] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
We present the studies of structural and magnetic properties of graphene composites prepared with several quantities ofα-Fe2O3dopant of 5%, 25% and 50% made with either ethanol or acetone. Our studies showed the presence of a weak magnetic order up to room temperature and saturation magnetization close to 0.2 emu g-1in pure commercial graphene. With regard to magnetic properties of our graphene + iron oxide samples, the solvent used during the preparation of the composite had a significant influence on them. For graphene + Fe2O3samples made with acetone the magnetic properties of pure graphene played a major role in the overall magnetic susceptibility and magnetization. On the other hand, for graphene + iron oxide samples made with ethanol we observed the presence of superparamagnetic blocking atT < 110 K which was due to the additional appearance ofγ-Fe3O4nanoparticles. Changes in the synthesis solvent played a major role in the magnetic properties of our graphene + Fe2O3nanocomposite samples resulting in much higher saturation magnetization for the samples made with ethanol. Both the shape and the parameters characterizing magnetization hysteresis loops depend strongly on the amount of iron oxide and changes in the preparation method.
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Affiliation(s)
- L Kilanski
- Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
| | - R Jedrzejewski
- Łukasiewicz Research Network-PORT Polish Center for Technology Development, ul. Stabłowicka 147, 54-066 Wrocław, Poland
| | - D Sibera
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Szczecin, Poland
- Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, al. Piastów 50a, 70-311 Szczecin, Poland
| | - I Kuryliszyn-Kudelska
- Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
| | - S Gorantla
- Łukasiewicz Research Network-PORT Polish Center for Technology Development, ul. Stabłowicka 147, 54-066 Wrocław, Poland
| | - R Idczak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wrocław, Poland
- Institute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland
| | - V H Tran
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wrocław, Poland
| | - A Jedrzejewska
- Łukasiewicz Research Network-PORT Polish Center for Technology Development, ul. Stabłowicka 147, 54-066 Wrocław, Poland
- Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Szczecin, Poland
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Ghafoor S, Fan K, Williams S, Brown A, Bowman S, Pettit KL, Gorantla S, Quillivan R, Schwartzberg S, Curry A, Parkhurst L, James M, Smith J, Canavera K, Elliott A, Frett M, Trone D, Butrum-Sullivan J, Barger C, Lorino M, Mazur J, Dodson M, Melancon M, Hall LA, Rains J, Avent Y, Burlison J, Wang F, Pan H, Lenk MA, Morrison RR, Kudchadkar SR. Beginning Restorative Activities Very Early: Implementation of an Early Mobility Initiative in a Pediatric Onco-Critical Care Unit. Front Oncol 2021; 11:645716. [PMID: 33763377 PMCID: PMC7982584 DOI: 10.3389/fonc.2021.645716] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/01/2021] [Indexed: 12/23/2022] Open
Abstract
Introduction Children with underlying oncologic and hematologic diseases who require critical care services have unique risk factors for developing functional impairments from pediatric post-intensive care syndrome (PICS-p). Early mobilization and rehabilitation programs offer a promising approach for mitigating the effects of PICS-p in oncology patients but have not yet been studied in this high-risk population. Methods We describe the development and feasibility of implementing an early mobility quality improvement initiative in a dedicated pediatric onco-critical care unit. Our primary outcomes include the percentage of patients with consults for rehabilitation services within 72 h of admission, the percentage of patients who are mobilized within 72 h of admission, and the percentage of patients with a positive delirium screen after 48 h of admission. Results Between January 2019 and June 2020, we significantly increased the proportion of patients with consults ordered for rehabilitation services within 72 h of admission from 25 to 56% (p<0.001), increased the percentage of patients who were mobilized within 72 h of admission to the intensive care unit from 21 to 30% (p=0.02), and observed a decrease in patients with positive delirium screens from 43 to 37% (p=0.46). The early mobility initiative was not associated with an increase in unplanned extubations, unintentional removal of central venous catheters, or injury to patient or staff. Conclusions Our experience supports the safety and feasibility of early mobility initiatives in pediatric onco-critical care. Additional evaluation is needed to determine the effects of early mobilization on patient outcomes.
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Affiliation(s)
- Saad Ghafoor
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Kimberly Fan
- Department of Pediatric Critical Care, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Sarah Williams
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Amanda Brown
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Sarah Bowman
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Kenneth L Pettit
- Office of Quality and Patient Care, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Shilpa Gorantla
- Office of Quality and Patient Care, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Rebecca Quillivan
- Office of Quality and Patient Care, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Sarah Schwartzberg
- Department of Rehabilitation Services, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Amanda Curry
- Department of Rehabilitation Services, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Lucy Parkhurst
- Department of Rehabilitation Services, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Marshay James
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jennifer Smith
- Department of Child Life, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Kristin Canavera
- Department of Psychology, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Andrew Elliott
- Division of Psychiatry, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Michael Frett
- Division of Anesthesiology, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Deni Trone
- Department of Pharmaceutical Services, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jacqueline Butrum-Sullivan
- Department Critical Care/Pulmonary Medicine-Respiratory Therapy, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Cynthia Barger
- Department of Inpatient Units-Nursing, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Mary Lorino
- Department of Inpatient Units-Nursing, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jennifer Mazur
- Department of Nursing Administration- Nursing Education, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Mandi Dodson
- Department of Nursing Administration- Nursing Education, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Morgan Melancon
- Department of Nursing Administration- Nursing Education, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Leigh Anne Hall
- Department of Inpatient Units-Nursing, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jason Rains
- Department Critical Care/Pulmonary Medicine-Respiratory Therapy, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Yvonne Avent
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Jonathan Burlison
- Department of Pharmaceutical Sciences- Patient Safety, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Fang Wang
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Haitao Pan
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Mary Anne Lenk
- Department of Quality Improvement Education and Training, Cincinnati Children's Hospital- James M. Anderson Center for Health Systems Excellence, Cincinnati, OH, United States
| | - R Ray Morrison
- Division of Critical Care Medicine, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, United States
| | - Sapna R Kudchadkar
- Departments of Anesthesiology and Critical Care Medicine, Pediatrics and Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Mansfield SA, Kimble A, Rodriguez L, Murphy AJ, Gorantla S, Huang EY, Anghelescu DL, Davidoff AM. Validating an opioid prescribing algorithm in post-operative pediatric surgical oncology patients. J Pediatr Surg 2020; 56:S0022-3468(20)30689-8. [PMID: 34756373 DOI: 10.1016/j.jpedsurg.2020.09.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 09/18/2020] [Accepted: 09/22/2020] [Indexed: 01/21/2023]
Abstract
PURPOSE We developed an algorithm to decrease opioid prescriptions for pediatric oncology patients at discharge following surgery, based on a retrospective analysis to decrease variability and over-prescribing. The aim of this study was to prospectively test the algorithm. METHODS Opioid-naïve patients undergoing surgery for tumor resection at a single institution were included. A prescribing algorithm was developed based on surgical approach, day of discharge, and inpatient opioid use. Prospectively collected data included outpatient opioid consumption and patient/family satisfaction. Total home dose prescribed was equal to that used in the 8 or 24 h, depending on length of stay and operative approach, prior to discharge, divided into 0.15 mg/kg doses. RESULTS The algorithm was used in 121 patients and correctly predicted outpatient opioid requirements for 102 patients (84.3%). For 15 (12.4%) patients, the algorithm over-estimated opioid need by an average of 0.38 OME/kg. Four (3.3%) patients required additional opioids. Using this algorithm, we decreased overall opioid prescriptions from 6.17 to 0.21 OME/kg (p < 0.001), and all but one patient/family reported being satisfied with post-operative pain control. CONCLUSION Using an algorithm based on inpatient opioid use, outpatient opioid needs can be accurately predicted, thereby reducing excess opioid prescriptions without detriment to patient satisfaction. TYPE OF STUDY Prospective Quality Initiative Study. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Sara A Mansfield
- Department of Surgery, St. Jude Children's Research Hospital, Memphis, TN.
| | - Amy Kimble
- Department of Surgery, St. Jude Children's Research Hospital, Memphis, TN
| | - Lynn Rodriguez
- Department of Surgery, St. Jude Children's Research Hospital, Memphis, TN
| | - Andrew J Murphy
- Department of Surgery, St. Jude Children's Research Hospital, Memphis, TN; Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Science Center, Memphis, TN
| | - Shilpa Gorantla
- Quality and Patient Care, St. Jude Children's Research Hospital, Memphis, TN
| | - Eunice Y Huang
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Science Center, Memphis, TN
| | - Doralina L Anghelescu
- Division of Anesthesiology, Department of Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN
| | - Andrew M Davidoff
- Department of Surgery, St. Jude Children's Research Hospital, Memphis, TN; Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Science Center, Memphis, TN
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Jensen IJT, Gorantla S, Løvvik OM, Gan J, Nguyen PD, Monakhov E, Svensson BG, Gunnæs AE, Diplas S. Interface phenomena in magnetron sputtered Cu 2O/ZnO heterostructures. J Phys Condens Matter 2017; 29:435002. [PMID: 28829336 DOI: 10.1088/1361-648x/aa8799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The interface between ZnO and Cu2O has been predicted to be a good candidate for use in thin film solar cells. However, the high predicted conversion efficiency has yet to be fully realized experimentally. To explore the underlying causes of this we investigate the interface between ZnO and Cu2O in magnetron sputtered samples. Two different sample geometries were made: In the first set thin layers of ZnO were deposited on Cu2O (type A), while in the second set the order was reversed (type B). Using x-ray photoelectron spectroscopy (XPS), an intermediate CuO layer was identified regardless of the order in which the Cu2O and ZnO layers were deposited. The presence of a CuO layer was supported by transmission electron microscopy (TEM) results. Changes in the electron hole screening conditions were observed in CuO near the interface with ZnO, manifested as changes in the relative peak-to-satellite ratio and the degree of asymmetric broadness in the Cu 2p peak. The suppression of the Cu 2p satellite characteristic of CuO may cause the CuO presence to be overlooked and cause errors in determinations of valence band offsets (VBOs). For the type A samples, we compare four different approaches to XPS-based determination of VBO and find that the most reliable results are obtained when the thin CuO layer and the altered screening conditions at the interface were taken into account. The VBOs were found to range between 2.5 eV and 2.8 eV. For the B type samples a reduction of the Cu 2p-LMM Auger parameter was found as compared to bulk Cu2O, indicative of quantum confinement in the Cu2O overlayer.
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Affiliation(s)
- I J T Jensen
- SINTEF Materials and Chemistry, P/O box 124 Blindern, 0314 Oslo, Norway
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Senanayake TH, Gorantla S, Makarov E, Lu Y, Warren G, Vinogradov SV. Nanogel-Conjugated Reverse Transcriptase Inhibitors and Their Combinations as Novel Antiviral Agents with Increased Efficacy against HIV-1 Infection. Mol Pharm 2015; 12:4226-36. [PMID: 26565115 DOI: 10.1021/acs.molpharmaceut.5b00424] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 12/24/2022]
Abstract
Nucleoside reverse transcriptase inhibitors (NRTIs) are an integral part of the current antiretroviral therapy (ART), which dramatically reduced the mortality from AIDS and turned the disease from lethal to chronic. The further steps in curing the HIV-1 infection must include more effective targeting of infected cells and virus sanctuaries inside the body and modification of drugs and treatment schedules to reduce common complications of the long-term treatment and increase patient compliancy. Here, we describe novel NRTI prodrugs synthesized from cholesteryl-ε-polylysine (CEPL) nanogels by conjugation with NRTI 5'-succinate derivatives (sNRTI). Biodegradability, small particle size, and high NRTI loading (30% by weight) of these conjugates; extended drug release, which would allow a weekly administration schedule; high therapeutic index (>1000) with a lower toxicity compared to NRTIs; and efficient accumulation in macrophages known as carriers for HIV-1 infection are among the most attractive properties of new nanodrugs. Nanogel conjugates of zidovudine (AZT), lamivudine (3TC), and abacavir (ABC) have been investigated individually and in formulations similar to clinical NRTI cocktails. Nanodrug formulations demonstrated 10-fold suppression of reverse transcriptase activity (EC90) in HIV-infected macrophages at 2-10, 2-4, and 1-2 μM drug levels, respectively, for single nanodrugs and dual and triple nanodrug cocktails. Nanogel conjugate of lamivudine was the most effective single nanodrug (EC90 2 μM). Nanodrugs showed a more favorable pharmacokinetics compared to free NRTIs. Infrequent iv injections of PEGylated CEPL-sAZT alone could efficiently suppress HIV-1 RT activity to background level in humanized mouse (hu-PBL) HIV model.
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Affiliation(s)
- T H Senanayake
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
| | - S Gorantla
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
| | - E Makarov
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
| | - Y Lu
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
| | - G Warren
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
| | - S V Vinogradov
- Department of Pharmaceutical Sciences, College of Pharmacy, and ‡Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center , Omaha, Nebraska 68198, United States
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Bonab AA, Fricchione JG, Gorantla S, Vitalo AG, Auster ME, Levine SJ, Scichilone JM, Hegde M, Foote W, Fricchione GL, Denninger JW, Yarmush DM, Fischman AJ, Yarmush ML, Levine JB. Isolation rearing significantly perturbs brain metabolism in the thalamus and hippocampus. Neuroscience 2012; 223:457-64. [PMID: 22835621 DOI: 10.1016/j.neuroscience.2012.07.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 07/16/2012] [Accepted: 07/17/2012] [Indexed: 01/04/2023]
Abstract
Psychosocial neglect during childhood severely impairs both behavioral and physical health. The isolation rearing model in rodents has been employed by our group and others to study this clinical problem at a basic level. We previously showed that immediate early gene (IEG) expression in the hippocampus and medial prefrontal cortex (mPFC) is decreased in isolation-reared (IR) compared to group-reared (GR) rats. In the current study, we sought to evaluate: (1) whether these changes in IEG expression would be detected by the measurement of brain glucose metabolism using positron emission tomography (PET) with fluorodeoxyglucose (FDG) and (2) whether PET FDG could illuminate other brain regions with different glucose metabolism in IR compared to GR rats. We found that there were significant differences in FDG uptake in the hippocampus that were consistent with our findings for IEG expression (decreased mean FDG uptake in IR rats). In contrast, in the mPFC, the FDG uptake between IR and GR rats did not differ. Finally, we found decreased mean FDG uptake in the thalamus of the IR rats, a region we had not previously examined. The results suggest that PET FDG has the potential to be utilized as a biomarker of molecular changes in the hippocampus. Further, the differences found in thalamic brain FDG uptake suggest that further investigation of this region at the molecular and cellular levels may provide an important insight into the neurobiological basis of the adverse clinical outcomes found in children exposed to psychosocial deprivation.
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Affiliation(s)
- A A Bonab
- Department of Nuclear Medicine, Massachusetts General Hospital, United States
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Pauly S, Gorantla S, Wang G, Kühn U, Eckert J. Transformation-mediated ductility in CuZr-based bulk metallic glasses. Nat Mater 2010; 9:473-477. [PMID: 20473286 DOI: 10.1038/nmat2767] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Accepted: 04/09/2010] [Indexed: 05/29/2023]
Abstract
Bulk metallic glasses (BMGs) generally fail in a brittle manner under uniaxial, quasistatic loading at room temperature. The lack of plastic strain is a consequence of shear softening, a phenomenon that originates from shear-induced dilation that causes plastic strain to be highly localized in shear bands. So far, significant tensile ductility has been reported only for microscopic samples of around 100 nm (ref. 4) as well as for high strain rates, and so far no mechanisms are known, which could lead to work hardening and ductility in quasistatic tension in macroscopic BMG samples. In the present work we developed CuZr-based BMGs, which polymorphically precipitate nanocrystals during tensile deformation and subsequently these nanocrystals undergo twinning. The formation of such structural heterogeneities hampers shear band generation and results in macroscopically detectable plastic strain and work hardening. The precipitation of nanocrystals and their subsequent twinning can be understood in terms of a deformation-induced softening of the instantaneous shear modulus. This unique deformation mechanism is believed to be not just limited to CuZr-based BMGs but also to promote ductility in other BMGs.
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Bai J, Gorantla S, Banda N, Cagnon L, Rossi J, Akkina R. Characterization of anti-CCR5 ribozyme-transduced CD34+ hematopoietic progenitor cells in vitro and in a SCID-hu mouse model in vivo. Mol Ther 2000; 1:244-54. [PMID: 10933940 DOI: 10.1006/mthe.2000.0038] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [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: 11/22/2022] Open
Abstract
The cellular entry of HIV is mediated by the specific interaction of viral envelope glycoproteins with the cell-surface marker CD4 and a chemokine receptor (CCR5 or CXCR4). Individuals with a 32-base-pair (bp) deletion in the CCR5 coding region, which results in a truncated peptide, show resistance to HIV-1 infection. This suggests that the downregulation of CCR5 expression on target cells may prevent HIV infection. Therefore, ribozymes that inhibit the CCR5 expression offer a novel approach for anti-HIV gene therapy. To assess the effect of an anti-CCR5 ribozyme (R5Rbz) on macrophage differentiation, CD34+ hematopoietic progenitor cells were transduced with a retroviral vector carrying RSRbz and allowed to differentiate in the presence of appropriate cytokines. R5Rbz-transduced CD34+ cells differentiated normally into mature macrophages that carried CD14 and CD4 surface markers, expressed the anti-CCR5 ribozyme, and showed significant resistance to viral infection upon challenge with the HIV-1 BaL strain. Using an in vivo thymopoiesis model, the effect of RSRbz on stem cell differentiation into thymocytes was evaluated by reconstituting SCID-hu mice thymic grafts with ribozyme-transduced CD34+ cells. FACS analysis of cell biopsies at 4 and 6 weeks postengraftment for HLA, CD4, and CD8 markers showed comparable levels of reconstitution and similar percentages of subpopulations of thymocytes between grafts receiving R5Rbz-transduced and control CD34+ cells. RT-PCR assays demonstrated the expression of the anti-CCR5 ribozyme in CD4+, CD8+, and CD4+/CD8+ thymocyte subsets derived from RSRbz-transduced CD34+ cells. These results indicate that anti-CCR5 ribozyme can be introduced into hematopoietic stem cells without adverse effects on their subsequent lineage-specific differentiation and maturation. The expression of anti-CCR5 ribozymes in HIV-1 target cells offers a novel gene therapy strategy to control HIV infection.
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Affiliation(s)
- J Bai
- Department of Pathology, Colorado State University, Fort Collins 80523, USA
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