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Wang W, Hassan MM, Kapoor-Kaushik N, Livni L, Musrie B, Tang J, Mahmud Z, Lai S, Wich PR, Ananthanarayanan V, Moalem-Taylor G, Mao G. Neural Tracing Protein-Functionalized Nanoparticles Capable of Fast Retrograde Axonal Transport in Live Neurons. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2311921. [PMID: 38647340 DOI: 10.1002/smll.202311921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/29/2024] [Indexed: 04/25/2024]
Abstract
Neural tracing proteins like horseradish peroxidase-conjugated wheat germ agglutinin (WGA-HRP) can target the central nervous system (CNS) through anatomic retrograde transport without crossing the blood-brain barrier (BBB). Conjugating WGA-HRP to nanoparticles may enable the creation of BBB-bypassing nanomedicine. Microfluidics and two-photon confocal microscopy is applied to screen nanocarriers for transport efficacy and gain mechanistic insights into their interactions with neurons. Protein modification of gold nanoparticles alters their cellular uptake at the axonal terminal and activates fast retrograde transport. Trajectory analysis of individual endosomes carrying the nanoparticles reveals a run-and-pause pattern along the axon with endosomes carrying WGA-HRP-conjugated gold nanoparticles exhibiting longer run duration and faster instantaneous velocity than those carrying nonconjugated nanoparticles. The results offer a mechanistic explanation of the different axonal transport dynamics as well as a cell-based functional assay of neuron-targeted nanoparticles with the goal of developing BBB-bypassing nanomedicine for the treatment of nervous system disorders.
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Affiliation(s)
- Wenqian Wang
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Md Musfizur Hassan
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Natasha Kapoor-Kaushik
- Electron Microscopy Unit, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Lital Livni
- School of Biomedical Sciences, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Benjamin Musrie
- School of Biomedical Sciences, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Jianbo Tang
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Zaheri Mahmud
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Saluo Lai
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Peter Richard Wich
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
| | - Vaishnavi Ananthanarayanan
- EMBL Australia Node in Single Molecule Science, Department of Molecular Medicine, School of Biomedical Sciences, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Gila Moalem-Taylor
- School of Biomedical Sciences, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Guangzhao Mao
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, NSW, 2052, Australia
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2
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Wang W, Yong J, Marciano P, O’Hare Doig R, Mao G, Clark J. The Translation of Nanomedicines in the Contexts of Spinal Cord Injury and Repair. Cells 2024; 13:569. [PMID: 38607008 PMCID: PMC11011097 DOI: 10.3390/cells13070569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Revised: 03/16/2024] [Accepted: 03/20/2024] [Indexed: 04/13/2024] Open
Abstract
PURPOSE OF THIS REVIEW Manipulating or re-engineering the damaged human spinal cord to achieve neuro-recovery is one of the foremost challenges of modern science. Addressing the restricted permission of neural cells and topographically organised neural tissue for self-renewal and spontaneous regeneration, respectively, is not straightforward, as exemplified by rare instances of translational success. This review assembles an understanding of advances in nanomedicine for spinal cord injury (SCI) and related clinical indications of relevance to attempts to design, engineer, and target nanotechnologies to multiple molecular networks. RECENT FINDINGS Recent research provides a new understanding of the health benefits and regulatory landscape of nanomedicines based on a background of advances in mRNA-based nanocarrier vaccines and quantum dot-based optical imaging. In relation to spinal cord pathology, the extant literature details promising advances in nanoneuropharmacology and regenerative medicine that inform the present understanding of the nanoparticle (NP) biocompatibility-neurotoxicity relationship. In this review, the conceptual bases of nanotechnology and nanomaterial chemistry covering organic and inorganic particles of sizes generally less than 100 nm in diameter will be addressed. Regarding the centrally active nanotechnologies selected for this review, attention is paid to NP physico-chemistry, functionalisation, delivery, biocompatibility, biodistribution, toxicology, and key molecular targets and biological effects intrinsic to and beyond the spinal cord parenchyma. SUMMARY The advance of nanotechnologies for the treatment of refractory spinal cord pathologies requires an in-depth understanding of neurobiological and topographical principles and a consideration of additional complexities involving the research's translational and regulatory landscapes.
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Affiliation(s)
- Wenqian Wang
- School of Chemical Engineering, University of New South Wales (UNSW), Kensington, NSW 2052, Australia; (W.W.); (J.Y.); (G.M.)
| | - Joel Yong
- School of Chemical Engineering, University of New South Wales (UNSW), Kensington, NSW 2052, Australia; (W.W.); (J.Y.); (G.M.)
| | - Paul Marciano
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (P.M.); (R.O.D.)
- Neil Sachse Centre for Spinal Cord Research, Lifelong Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia
| | - Ryan O’Hare Doig
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (P.M.); (R.O.D.)
- Neil Sachse Centre for Spinal Cord Research, Lifelong Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia
| | - Guangzhao Mao
- School of Chemical Engineering, University of New South Wales (UNSW), Kensington, NSW 2052, Australia; (W.W.); (J.Y.); (G.M.)
| | - Jillian Clark
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (P.M.); (R.O.D.)
- Neil Sachse Centre for Spinal Cord Research, Lifelong Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia
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3
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Wang W, Hassan MM, Mao G. Colloidal Perspective on Targeted Drug Delivery to the Central Nervous System. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:3235-3245. [PMID: 36825490 DOI: 10.1021/acs.langmuir.2c02949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
This article describes a new approach in targeted drug delivery to the central nervous system (CNS) in a significant departure from the predominant systematic drug administration attempting to penetrate the blood-brain barrier (BBB). Nanoparticles chemically conjugated to neural tract tracer proteins are capable of path-specific axonal retrograde transport, transneuronal transport, and anatomical tract flow to bypass the BBB. To celebrate the work by Dr. Bettye Washington Greene on the physical chemistry of colloidal particles, this article focuses on the physiochemical characteristics of the nanoparticles, various colloidal forces that impact the colloidal stability of nanoparticles in biological media, and surface chemistry strategies to avoid nanoparticle aggregation-induced poor therapeutic outcomes. The biological environment for the anatomical retrograde transport of neural tract tracers is examined to directly link factors impacting the colloidal stability of the new class of CNS-targeting nanoconjugates such as nanoconjugate size, shape, surface charge, surface chemistry, ionic strength, pH, and protein adsorption on the nanoparticle. We conclude with opportunities and challenges for future research.
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Affiliation(s)
- Wenqian Wang
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
| | - Md Musfizur Hassan
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
| | - Guangzhao Mao
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
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4
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Thakre PP, Rana S, Benevides ES, Fuller DD. Targeting drug or gene delivery to the phrenic motoneuron pool. J Neurophysiol 2023; 129:144-158. [PMID: 36416447 PMCID: PMC9829468 DOI: 10.1152/jn.00432.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/19/2022] [Accepted: 11/19/2022] [Indexed: 11/24/2022] Open
Abstract
Phrenic motoneurons (PhrMNs) innervate diaphragm myofibers. Located in the ventral gray matter (lamina IX), PhrMNs form a column extending from approximately the third to sixth cervical spinal segment. Phrenic motor output and diaphragm activation are impaired in many neuromuscular diseases, and targeted delivery of drugs and/or genetic material to PhrMNs may have therapeutic application. Studies of phrenic motor control and/or neuroplasticity mechanisms also typically require targeting of PhrMNs with drugs, viral vectors, or tracers. The location of the phrenic motoneuron pool, however, poses a challenge. Selective PhrMN targeting is possible with molecules that move retrogradely upon uptake into phrenic axons subsequent to diaphragm or phrenic nerve delivery. However, nonspecific approaches that use intrathecal or intravenous delivery have considerably advanced the understanding of PhrMN control. New opportunities for targeted PhrMN gene expression may be possible with intersectional genetic methods. This article provides an overview of methods for targeting the phrenic motoneuron pool for studies of PhrMNs in health and disease.
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Affiliation(s)
- Prajwal P Thakre
- Department of Physical Therapy, University of Florida, Gainesville, Florida
- McKnight Brain Institute, University of Florida, Gainesville, Florida
- Breathing Research and Therapeutics Center, Gainesville, Florida
| | - Sabhya Rana
- Department of Physical Therapy, University of Florida, Gainesville, Florida
- McKnight Brain Institute, University of Florida, Gainesville, Florida
- Breathing Research and Therapeutics Center, Gainesville, Florida
| | - Ethan S Benevides
- Department of Physical Therapy, University of Florida, Gainesville, Florida
- McKnight Brain Institute, University of Florida, Gainesville, Florida
- Breathing Research and Therapeutics Center, Gainesville, Florida
| | - David D Fuller
- Department of Physical Therapy, University of Florida, Gainesville, Florida
- McKnight Brain Institute, University of Florida, Gainesville, Florida
- Breathing Research and Therapeutics Center, Gainesville, Florida
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Gao X, Hassan MM, Ghosh S, Mao G, Sankari A. Efficacy and toxicity of the DPCPX nanoconjugate drug study for the treatment of spinal cord injury in rats. J Appl Physiol (1985) 2022; 133:262-272. [PMID: 35771225 PMCID: PMC9342139 DOI: 10.1152/japplphysiol.00195.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Effects of the Adenosine A1 blockade using 8-cyclopentyl-1,3-diprophyxanthine (DPCPX) nanoconjugate on inducing recovery of the hemidiaphragm paralyzed by hemisection have been thoroughly examined previously; however, the toxicology of DPCPX nanoconjugate remains unknown. This research study investigates the therapeutic efficacy and toxicology of the nanoconjugate DPCPX in the cervical spinal cord injury (SCI) rat model. We hypothesized that a single injection of nanoconjugate DPCPX in the paralyzed left hemidiaphragm (LDH) of hemisected rats at the 2nd cervical segment (C2Hx) would lead to the long-term recovery of LDH while showing minimal toxicity. Adult male rats underwent left C2Hx surgery and the diaphragms' baseline electromyography (EMG). Subsequently, rats were randomized into a control group, and four treated subgroups. Three subgroups received a single intradiaphragmatic dose of either 0.09, 0.15, 0.27 µg/kg, and one subgroup received 0.1 mg/kg of native DPCPX 2 times/day intravenous (i.v.) for 3 days (total 0.6 mg/kg). Rats were monitored for a total of 56 days. Compared to control, the treatment with nanoconjugate DPCPX at 0.09 µg/kg, 0.15 µg/kg, and 0.27 µg/kg doses elicited significant recovery of paralyzed LDH (i.e., 67% recovery at eight weeks) (p<0.05). DPCPX nanoconjugate treated rats had significant weight loss first two weeks but recovered significantly by day 56 (p<0.05). The levels of gold in the blood and body tissues were below the recommended levels. No sign of weakness, histology of tissue damage, or organ abnormality was observed. A single dose of DPCPX nanoconjugate can induce long-term diaphragm recovery after SCI without observed toxicity.
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Affiliation(s)
- Xiaohua Gao
- Division of Pulmonary/Critical Care and Sleep Medicine, Department of Internal Medicine, Wayne State University, Detroit, Michigan, United States.,John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan, United States
| | - Md Musfizur Hassan
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney. Australia
| | - Samiran Ghosh
- Department of Family Medicine and Public Health Sciences, Wayne State University, Detroit, MI, United States
| | - Guangzhao Mao
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney. Australia
| | - Abdulghani Sankari
- Division of Pulmonary/Critical Care and Sleep Medicine, Department of Internal Medicine, Wayne State University, Detroit, Michigan, United States.,John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan, United States.,Department of Medical Education, Ascension Providence Hospital, Southfield, Michigan, United States
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6
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Hassan MM, Hettiarachchi M, Kilani M, Gao X, Sankari A, Boyer C, Mao G. Sustained A1 Adenosine Receptor Antagonist Drug Release from Nanoparticles Functionalized by a Neural Tracing Protein. ACS Chem Neurosci 2021; 12:4438-4448. [PMID: 34672533 DOI: 10.1021/acschemneuro.1c00538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Respiratory dysfunction is a major cause of death in people with spinal cord injury (SCI). A remaining unsolved problem in treating SCI is the intolerable side effects of the drugs to patients. In a significant departure from conventional targeted nanotherapeutics to overcome the blood-brain barrier (BBB), this work pursues a drug-delivery approach that uses neural tracing retrograde transport proteins to bypass the BBB and deliver an adenosine A1 receptor antagonist drug, 1,3-dipropyl-8-cyclopentyl xanthine, exclusively to the respiratory motoneurons in the spinal cord and the brainstem. A single intradiaphragmatic injection at one thousandth of the native drug dosage induces prolonged respiratory recovery in a hemisection animal model. To translate the discovery into new treatments for respiratory dysfunction, we carry out this study to characterize the purity and quality of synthesis, stability, and drug-release properties of the neural tracing protein (wheat germ agglutinin chemically conjugated to horseradish peroxidase)-coupled nanoconjugate. We show that the batch-to-batch particle size and drug dosage variations are less than 10%. We evaluate the nanoconjugate size against the spatial constraints imposed by transsynaptic transport from pre to postsynaptic neurons. We determine that the nanoconjugate formulation is capable of sustained drug release lasting for days at physiologic pH, a prerequisite for long-distance transport of the drug from the diaphragm muscle to the brainstem. We model the drug-release profiles using a first-order reaction model and the Noyes-Whitney diffusion model. We confirm via biological electron microscopy that the nanoconjugate particles do not accumulate in the tissues at the injection site. We define the nanoconjugate storage conditions after monitoring the solution dispersion stability under various conditions for 4 months. This study supports further development of neural tracing protein-enabled nanotherapeutics for treating respiratory problems associated with SCI.
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Affiliation(s)
- Md. Musfizur Hassan
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
| | - Malsha Hettiarachchi
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Mohamed Kilani
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
| | - Xiaohua Gao
- School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
| | - Abdulghani Sankari
- School of Medicine, Wayne State University, Detroit, Michigan 48201, United States
| | - Cyrille Boyer
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
- Australian Centre for Nanomedicine, Sydney, New South Wales 2052, Australia
| | - Guangzhao Mao
- School of Chemical Engineering, University of New South Wales (UNSW Sydney), Sydney, New South Wales 2052, Australia
- Australian Centre for Nanomedicine, Sydney, New South Wales 2052, Australia
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7
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Janic B, Brown SL, Neff R, Liu F, Mao G, Chen Y, Jackson L, Chetty IJ, Movsas B, Wen N. Therapeutic enhancement of radiation and immunomodulation by gold nanoparticles in triple negative breast cancer. Cancer Biol Ther 2021; 22:124-135. [PMID: 33459132 PMCID: PMC7928016 DOI: 10.1080/15384047.2020.1861923] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Gold nanoparticles (AuNPs) have been shown to enhance cancer radiotherapy (RT) gain by localizing the absorption of radiation energy in the tumor while sparing surrounding normal tissue from radiation toxicity. Previously, we showed that AuNPs enhanced RT induced DNA damage and cytotoxicity in MCF7 breast cancer cells. Interestingly, we found that cancer cells exhibited a size-dependent AuNPs intracellular localization (4 nm preferentially in the cytoplasm and 14 nm in the nucleus). We extended those studies to an in vivo model and examined the AuNPs effects on RT cytotoxicity, survival and immunomodulation of tumor microenvironment (TME) in human triple negative breast cancer (TNBC) xenograft mouse model. We also explored the significance of nanoparticle size in these AuNPs’ effects. Mice treated with RT and RT plus 4 nm or 14 nm AuNPs showed a significant tumor growth delay, compared to untreated animals, while dual RT plus AuNPs treatment exhibited additive effect compared to either RT or AuNPs treatment alone. Survival log-rank test showed significant RT enhancement with 14 nm AuNP alone; however, 4 nm AuNPs did not exhibit RT enhancement. Both sizes of AuNPs enhanced RT induced immunogenic cell death (ICD) that was coupled with significant macrophage infiltration in mice pretreated with 14 nm AuNPs. These results showing significant AuNP size-dependent RT enhancement, as evident by both tumor growth delay and overall survival, reveal additional underlying immunological mechanisms and provide a platform for studying RT multimodal approaches for TNBC that may be combined with immunotherapies, enhancing their effect.
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Affiliation(s)
| | - Stephen L Brown
- Radiation Oncology, Henry Ford Hospital, Detroit, Michigan, USA
| | - Ryan Neff
- University of Notre Dame, South Bend, Indiana, USA
| | - Fangchao Liu
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan, USA
| | - Guangzhao Mao
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan, USA.,School of Chemical Engineering, Unsw Sydney, Kensington, Australia
| | - Yalei Chen
- Department of Public Health Sciences, Henry Ford Hospital, Detroit, Michigan, USA
| | - Latoya Jackson
- Department of Public Health Sciences, Henry Ford Hospital, Detroit, Michigan, USA
| | - Indrin J Chetty
- Radiation Oncology, Henry Ford Hospital, Detroit, Michigan, USA
| | - Benjamin Movsas
- Radiation Oncology, Henry Ford Hospital, Detroit, Michigan, USA
| | - Ning Wen
- Radiation Oncology, Henry Ford Hospital, Detroit, Michigan, USA
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Lin Y, Wan Y, Du X, Li J, Wei J, Li T, Li C, Liu Z, Zhou M, Zhong Z. TAT-modified serum albumin nanoparticles for sustained-release of tetramethylpyrazine and improved targeting to spinal cord injury. J Nanobiotechnology 2021; 19:28. [PMID: 33478501 PMCID: PMC7819157 DOI: 10.1186/s12951-020-00766-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 12/30/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Spinal Cord injury (SCI) is a kind of severe traumatic disease. The inflammatory response is a significant feature after SCI. Tetramethylpyrazine (TMP), a perennial herb of umbelliferae, is an alkaloid extracted from ligustici. TMP can inhibit the production of nitric oxide and reduce the inflammatory response in peripheral tissues. It can be seen that the therapeutic effect of TMP on SCI is worthy of affirmation. TMP has defects such as short half-life and poor water-solubility. In addition, the commonly used dosage forms of TMP include tablets, dropping pills, injections, etc., and its tissue and organ targeting is still a difficult problem to solve. To improve the solubility and targeting of TMP, here, we developed a nanotechnology-based drug delivery system, TMP-loaded nanoparticles modified with HIV trans-activator of transcription (TAT-TMP-NPs). RESULTS The nanoparticles prepared in this study has integrated structure. The hemolysis rate of each group is less than 5%, indicating that the target drug delivery system has good safety. The results of in vivo pharmacokinetic studies show that TAT-TMP-NPs improves the bioavailability of TMP. The quantitative results of drug distribution in vivo show that TAT-TMP-NPs is more distributed in spinal cord tissue and had higher tissue targeting ability compared with other treatment groups. CONCLUSIONS The target drug delivery system can overcome the defect of low solubility of TMP, achieve the targeting ability, and show the further clinical application prospect.
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Affiliation(s)
- Yan Lin
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Yujie Wan
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Xingjie Du
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Jian Li
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Jun Wei
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Ting Li
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Chunhong Li
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Zhongbing Liu
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Meiling Zhou
- Department of Pharmacy, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China.
| | - Zhirong Zhong
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China.
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Minic Z, O’Leary DS, Reynolds CA. Purinergic receptor antagonism: A viable strategy for the management of autonomic dysreflexia? Auton Neurosci 2021; 230:102741. [PMID: 33220530 PMCID: PMC8855366 DOI: 10.1016/j.autneu.2020.102741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 11/17/2022]
Abstract
The purinergic receptor ligand, ATP, may participate in reflex induced vasoconstriction through sympathetic efferent and sensory afferent mechanisms. However, the role of the purinergic system in contributing to autonomic dysreflexia following spinal cord injury is unclear. The present study investigates the involvement of P2X receptors in contributing to pressor responses during autonomic dysreflexia. Twenty rats were subjected to spinal cord injury and 24 h later hemodynamic responses to colorectal distension were recorded. Animals were randomized to receive intravenous administration of the P2X receptor antagonist, NF023, or vehicle control. The data indicate that NF023 attenuates pressor responses to colorectal distension.
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Affiliation(s)
- Zeljka Minic
- Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, MI, USA; Department of Physiology, Immunology and Pathophysiology, University of Rijeka Medical School, Rijeka, Croatia.
| | - Donal S. O’Leary
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Christian A. Reynolds
- Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, Michigan, USA,Department of Biotechnology, University of Rijeka, Rijeka, Croatia
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10
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Liu F, Zhang Y, Schafer J, Mao G, Goshgarian HG. Diaphragmatic recovery in rats with cervical spinal cord injury induced by a theophylline nanoconjugate: Challenges for clinical use. J Spinal Cord Med 2019; 42:725-734. [PMID: 30843479 PMCID: PMC6830233 DOI: 10.1080/10790268.2019.1577058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Context: Following a spinal cord hemisection at the second cervical segment the ipsilateral hemidiaphragm is paralyzed due to the disruption of the rostral ventral respiratory group (rVRG) axons descending to the ipsilateral phrenic motoneurons (PN). Systemically administered theophylline activates a functionally latent crossed phrenic pathway (CPP) which decussates caudal to the hemisection and activates phrenic motoneurons ipsilateral to the hemisection. The result is return of function to the paralyzed hemidiaphragm. Unfortunately, in humans, systemically administered theophylline at a therapeutic dose produces many unwanted side effects.Design and setting: A tripartite nanoconjugate was synthesized in which theophylline was coupled to a neuronal tracer, wheat germ agglutinin conjugated to horseradish peroxidase (WGA-HRP), using gold nanoparticles as the coupler. Following intradiaphragmatic injection of the nanoconjugate, WGA-HRP selectively targets the theophylline-bound nanoconjugate to phrenic motoneurons initially, followed by neurons in the rVRG by retrograde transsynaptic transport.Participants: (N/A)Interventions: (N/A)Outcome Measures: Immunostaining, Electromyography (EMG).Results: Delivery of the theophylline-coupled nanoconjugate to the nuclei involved in respiration induces a return of respiratory activity as detected by EMG of the diaphragm and a modest return of phrenic nerve activity.Conclusion: In addition to the modest return of phrenic nerve activity, there were many difficulties using the theophylline nanoconjugate because of its chemical instability, which suggests that the theophylline nanoconjugate should not be developed for clinical use as explained herein.
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Affiliation(s)
- Fangchao Liu
- Departments of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michagan, USA
| | - Yanhua Zhang
- Departments of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michagan, USA
| | - Janelle Schafer
- Department of Ophthalmology, Visual and Anatomical Sciences (OVAS), School of Medicine, Wayne State University, Detroit, Michagan, USA
| | - Guangzhao Mao
- Departments of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michagan, USA
| | - Harry G. Goshgarian
- Department of Ophthalmology, Visual and Anatomical Sciences (OVAS), School of Medicine, Wayne State University, Detroit, Michagan, USA,Correspondence to: Harry G. Goshgarian, Department of Ophthalmology, Visual and Anatomical Sciences (OVAS), School of Medicine, Wayne State University, 540 East Canfield Street, Detroit, MI 48201, USA; Ph: 1-313-577-1045; 1-313-577-3125.
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11
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Sankari A, Minic Z, Farshi P, Shanidze M, Mansour W, Liu F, Mao G, Goshgarian HG. Sleep disordered breathing induced by cervical spinal cord injury and effect of adenosine A1 receptors modulation in rats. J Appl Physiol (1985) 2019; 127:1668-1676. [PMID: 31600096 DOI: 10.1152/japplphysiol.00563.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Sleep-disordered breathing (SDB) is very common after spinal cord injury (SCI). The present study was designed to evaluate the therapeutic efficacy of adenosine A1 receptor blockade (8-cyclopentyl-1,3-dipropylxanthine, DPCPX) on SDB in a rodent model of SCI. We hypothesized that SCI induced via left hemisection of the second cervical segment (C2Hx) results in SDB. We further hypothesized that blockade of adenosine A1 receptors following C2Hx would reduce the severity of SDB. In the first experiment, adult male rats underwent left C2Hx or sham (laminectomy) surgery. Unrestrained whole body plethysmography (WBP) and implanted wireless electroencephalogram (EEG) were used for assessment of breathing during spontaneous sleep and for the scoring of respiratory events at the acute (~1 wk), and chronic (~6 wk) time points following C2Hx. During the second experiment, the effect of oral administration of adenosine A1 receptor antagonist (DPCPX, 3 times a day for 4 days) on SCI induced SDB was assessed. C2Hx animals exhibited a higher apnea-hypopnea index (AHI) compared with the sham group, respectively (35.5 ± 12.6 vs. 19.1 ± 2.1 events/h, P < 0.001). AHI was elevated 6 wk following C2Hx (week 6, 32.0 ± 5.0 vs. week 1, 42.6 ± 11.8 events/h, respectively, P = 0.12). In contrast to placebo, oral administration of DPCPX significantly decreased AHI 4 days after the treatment (159.8 ± 26.7 vs. 69.5 ± 8.9%, P < 0.05). Cervical SCI is associated with the development of SDB in spontaneously breathing rats. Adenosine A1 blockade can serve as a therapeutic target for SDB induced by SCI.NEW & NOTEWORTHY The two key novel findings of our study included that 1) induced cervical spinal cord injury results in sleep-disordered breathing in adult rats, and 2) oral therapy with an adenosine A1 receptor blockade using DPCPX is sufficient to significantly reduce apnea-hypopnea index following induced cervical spinal cord injury.
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Affiliation(s)
- Abdulghani Sankari
- John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan.,Department of Internal Medicine, Wayne State University, Detroit, Michigan.,Cardiovascular Research Institute, Wayne State University, Detroit, Michigan
| | - Zeljka Minic
- Cardiovascular Research Institute, Wayne State University, Detroit, Michigan.,Department of Emergency Medicine, Wayne State University, Detroit, Michigan.,Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, Detroit, Michigan
| | - Pershang Farshi
- John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan.,Department of Internal Medicine, Wayne State University, Detroit, Michigan
| | | | - Wafaa Mansour
- John D. Dingell Veterans Affairs Medical Center, Detroit, Michigan.,Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, Detroit, Michigan
| | - Fangchao Liu
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan
| | - Guangzhao Mao
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan
| | - Harry G Goshgarian
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, Detroit, Michigan
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Reynolds CA, O'Leary DS, Ly C, Smith SA, Minic Z. Development of a decerebrate model for investigating mechanisms mediating viscero-sympathetic reflexes in the spinalized rat. Am J Physiol Heart Circ Physiol 2019; 316:H1332-H1340. [PMID: 30875256 DOI: 10.1152/ajpheart.00724.2018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Autonomic dysreflexia (AD) often occurs in individuals living with spinal cord injury (SCI) and is characterized by uncontrolled hypertension in response to otherwise innocuous stimuli originating below the level of the spinal lesion. Visceral stimulation is a predominant cause of AD in humans and effectively replicates the phenotype in rodent models of SCI. Direct assessment of sympathetic responses to viscerosensory stimulation in spinalized animals is challenging and requires invasive surgical procedures necessitating the use of anesthesia. However, administration of anesthesia markedly affects viscerosensory reactivity, and the effects are exacerbated following spinal cord injury (SCI). Therefore, the major goal of the present study was to develop a decerebrate rodent preparation to facilitate quantification of sympathetic responses to visceral stimulation in the spinalized rat. Such a preparation enables the confounding effect of anesthesia to be eliminated. Sprague-Dawley rats were subjected to SCI at the fourth thoracic segment. Four weeks later, renal sympathetic nerve activity (RSNA) responses to visceral stimuli were quantified in urethane/chloralose-anesthetized and decerebrate preparations. Visceral stimulation was elicited via colorectal distension (CRD) for 1 min. In the decerebrate preparation, CRD produced dose-dependent increases in mean arterial pressure (MAP) and RSNA and dose-dependent decreases in heart rate (HR). These responses were significantly greater in magnitude among decerebrate animals when compared with urethane/chloralose-anesthetized controls and were markedly attenuated by the administration of urethane/chloralose anesthesia after decerebration. We conclude that the decerebrate preparation enables high-fidelity quantification of neuronal reactivity to visceral stimulation in spinalized rats. NEW & NOTEWORTHY In animal models commonly used to study spinal cord injury, quantification of sympathetic responses is particularly challenging due to the increased susceptibility of spinal reflex circuits to the anesthetic agents generally required for experimentation. This constitutes a major limitation to understanding the mechanisms mediating regionally specific neuronal responses to visceral activation in chronically spinalized animals. In the present study, we describe a spinalized, decerebrate rodent preparation that facilitates quantification of sympathetic reactivity in response to visceral stimuli following spinal cord injury. This preparation enables reliable and reproducible quantification of viscero-sympathetic reflex responses resembling those elicited in conscious animals and may provide added utility for preclinical evaluation of neuropharmacological agents for the management of autonomic dysreflexia.
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Affiliation(s)
- Christian A Reynolds
- Department of Emergency Medicine, Wayne State University School of Medicine , Detroit, Michigan.,Cardiovascular Research Institute, Wayne State University School of Medicine , Detroit, Michigan
| | - Donal S O'Leary
- Cardiovascular Research Institute, Wayne State University School of Medicine , Detroit, Michigan.,Department of Physiology, Wayne State University School of Medicine , Detroit, Michigan
| | - Cheng Ly
- Department of Statistical Sciences and Operations Research, Virginia Commonwealth University , Richmond, Virginia
| | - Scott A Smith
- Department of Internal Medicine, University of Texas Southwestern Medical Center , Dallas, Texas.,Department of Health Care Sciences, University of Texas Southwestern Medical Center , Dallas, Texas
| | - Zeljka Minic
- Department of Emergency Medicine, Wayne State University School of Medicine , Detroit, Michigan.,Cardiovascular Research Institute, Wayne State University School of Medicine , Detroit, Michigan
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13
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Saltiel P, d’Avella A, Tresch MC, Wyler K, Bizzi E. Critical Points and Traveling Wave in Locomotion: Experimental Evidence and Some Theoretical Considerations. Front Neural Circuits 2017; 11:98. [PMID: 29276476 PMCID: PMC5727018 DOI: 10.3389/fncir.2017.00098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 11/20/2017] [Indexed: 11/13/2022] Open
Abstract
The central pattern generator (CPG) architecture for rhythm generation remains partly elusive. We compare cat and frog locomotion results, where the component unrelated to pattern formation appears as a temporal grid, and traveling wave respectively. Frog spinal cord microstimulation with N-methyl-D-Aspartate (NMDA), a CPG activator, produced a limited set of force directions, sometimes tonic, but more often alternating between directions similar to the tonic forces. The tonic forces were topographically organized, and sites evoking rhythms with different force subsets were located close to the constituent tonic force regions. Thus CPGs consist of topographically organized modules. Modularity was also identified as a limited set of muscle synergies whose combinations reconstructed the EMGs. The cat CPG was investigated using proprioceptive inputs during fictive locomotion. Critical points identified both as abrupt transitions in the effect of phasic perturbations, and burst shape transitions, had biomechanical correlates in intact locomotion. During tonic proprioceptive perturbations, discrete shifts between these critical points explained the burst durations changes, and amplitude changes occurred at one of these points. Besides confirming CPG modularity, these results suggest a fixed temporal grid of anchoring points, to shift modules onsets and offsets. Frog locomotion, reconstructed with the NMDA synergies, showed a partially overlapping synergy activation sequence. Using the early synergy output evoked by NMDA at different spinal sites, revealed a rostrocaudal topographic organization, where each synergy is preferentially evoked from a few, albeit overlapping, cord regions. Comparing the locomotor synergy sequence with this topography suggests that a rostrocaudal traveling wave would activate the synergies in the proper sequence for locomotion. This output was reproduced in a two-layer model using this topography and a traveling wave. Together our results suggest two CPG components: modules, i.e., synergies; and temporal patterning, seen as a temporal grid in the cat, and a traveling wave in the frog. Animal and limb navigation have similarities. Research relating grid cells to the theta rhythm and on segmentation during navigation may relate to our temporal grid and traveling wave results. Winfree's mathematical work, combining critical phases and a traveling wave, also appears important. We conclude suggesting tracing, and imaging experiments to investigate our CPG model.
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Affiliation(s)
- Philippe Saltiel
- Department of Brain and Cognitive Sciences and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA, United States
- Département de Neurosciences, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Andrea d’Avella
- Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
- Laboratory of Neuromotor Physiology, Santa Lucia Foundation, Rome, Italy
| | - Matthew C. Tresch
- Departments of Biomedical Engineering, Physical Medicine and Rehabilitation, and Physiology, Northwestern University, Chicago, IL, United States
| | - Kuno Wyler
- Department of Brain and Cognitive Sciences and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Emilio Bizzi
- Department of Brain and Cognitive Sciences and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA, United States
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Minic Z, Wilson S, Liu F, Sankari A, Mao G, Goshgarian H. Nanoconjugate-bound adenosine A 1 receptor antagonist enhances recovery of breathing following acute cervical spinal cord injury. Exp Neurol 2017; 292:56-62. [PMID: 28223038 DOI: 10.1016/j.expneurol.2017.02.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 02/09/2017] [Accepted: 02/16/2017] [Indexed: 10/20/2022]
Abstract
Respiratory complications in patients with spinal cord injury (SCI) are common and can have a negative impact on the quality of patients' lives. Previously, we found that intradiaphragmatic administration of the nanoconjugate-bound A1 adenosine receptor antagonist, 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) induced recovery of diaphragm function following SCI in rats. When administered immediately following the injury, recovery was observed as early as 3days following SCI and it persisted until the end of the study, 28days after the drug delivery. The recovery was observed using diaphragmatic electromyography (EMG) as well as phrenic nerve recordings; both of which were conducted under anesthetized conditions. Confounding effects of anesthetic may make data interpretation complex in terms of the impact on overall ventilatory function and clinical relevance. The objective of the present study was to test the hypothesis that intradiaphragmatic administration of nanoconjugate-bound DPCPX, enhances recovery of ventilation following SCI in the unanesthetized rat. To that end, Sprague-Dawley rats underwent C2 spinal cord hemisection (C2Hx) on day 0 and received either: (i) 0.15μg/kg of nanoconjugate-bound DPCPX or (ii) vehicle control (50μl distilled water). To assess ventilation, unrestrained whole body plethysmography (WBP) was performed on day 0 (immediately before the surgery) and 3, 7, 14, 21 and 28days following the SCI. Frequency, tidal volume, and minute ventilation data were analyzed in two minute bins while the animal was calm and awake. We found that a single administration of the nanoconjugate-bound A1 adenosine receptor antagonist facilitated recovery of tidal volume and minute ventilation following SCI. Furthermore, the treatment attenuated SCI-associated increases in respiratory frequency. Taken together, this study suggests that the previously observed DPCPX nanoconjugate-induced recovery in diaphragmatic and phrenic motor outputs may translate to a clinically meaningful improvement in ventilatory function in patients with SCI.
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Affiliation(s)
- Zeljka Minic
- Wayne State University, School of Medicine, Department of Anatomy and Cell Biology, 540 E. Canfield St, Detroit, MI 48201, United States; Wayne State University, School of Medicine, Cardiovascular Research Institute, 540 E. Canfield St, Detroit, MI 48201, United States.
| | - Sharowyn Wilson
- Wayne State University, School of Medicine, Department of Anatomy and Cell Biology, 540 E. Canfield St, Detroit, MI 48201, United States
| | - Fangchao Liu
- Wayne State University, Department of Chemical Engineering and Materials Science, 5050 Anthony Wayne Drive, Detroit, MI 48202, United States
| | - Abdulghani Sankari
- Wayne State University, School of Medicine, Department of Anatomy and Cell Biology, 540 E. Canfield St, Detroit, MI 48201, United States; Wayne State University, School of Medicine, Cardiovascular Research Institute, 540 E. Canfield St, Detroit, MI 48201, United States; John D. Dingell VA Medical center, Department of Medicine, 4646 John R, Detroit, MI, 48201, United States
| | - Guangzhao Mao
- Wayne State University, Department of Chemical Engineering and Materials Science, 5050 Anthony Wayne Drive, Detroit, MI 48202, United States
| | - Harry Goshgarian
- Wayne State University, School of Medicine, Department of Anatomy and Cell Biology, 540 E. Canfield St, Detroit, MI 48201, United States
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