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Yu D, Zeng X, Aljuboori ZS, Dennison R, Wu L, Anderson JA, Teng YD. T12-L3 Nerve Transfer-Induced Locomotor Recovery in Rats with Thoracolumbar Contusion: Essential Roles of Sensory Input Rerouting and Central Neuroplasticity. Cells 2023; 12:2804. [PMID: 38132124 PMCID: PMC10741684 DOI: 10.3390/cells12242804] [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: 10/09/2023] [Revised: 11/28/2023] [Accepted: 12/05/2023] [Indexed: 12/23/2023] Open
Abstract
Locomotor recovery after spinal cord injury (SCI) remains an unmet challenge. Nerve transfer (NT), the connection of a functional/expendable peripheral nerve to a paralyzed nerve root, has long been clinically applied, aiming to restore motor control. However, outcomes have been inconsistent, suggesting that NT-induced neurological reinstatement may require activation of mechanisms beyond motor axon reinnervation (our hypothesis). We previously reported that to enhance rat locomotion following T13-L1 hemisection, T12-L3 NT must be performed within timeframes optimal for sensory nerve regrowth. Here, T12-L3 NT was performed for adult female rats with subacute (7-9 days) or chronic (8 weeks) mild (SCImi: 10 g × 12.5 mm) or moderate (SCImo: 10 g × 25 mm) T13-L1 thoracolumbar contusion. For chronic injuries, T11-12 implantation of adult hMSCs (1-week before NT), post-NT intramuscular delivery of FGF2, and environmentally enriched/enlarged (EEE) housing were provided. NT, not control procedures, qualitatively improved locomotion in both SCImi groups and animals with subacute SCImo. However, delayed NT did not produce neurological scale upgrading conversion for SCImo rats. Ablation of the T12 ventral/motor or dorsal/sensory root determined that the T12-L3 sensory input played a key role in hindlimb reanimation. Pharmacological, electrophysiological, and trans-synaptic tracing assays revealed that NT strengthened integrity of the propriospinal network, serotonergic neuromodulation, and the neuromuscular junction. Besides key outcomes of thoracolumbar contusion modeling, the data provides the first evidence that mixed NT-induced locomotor efficacy may rely pivotally on sensory rerouting and pro-repair neuroplasticity to reactivate neurocircuits/central pattern generators. The finding describes a novel neurobiology mechanism underlying NT, which can be targeted for development of innovative neurotization therapies.
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Affiliation(s)
- Dou Yu
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Xiang Zeng
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Zaid S. Aljuboori
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Rachel Dennison
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Liquan Wu
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Jamie A. Anderson
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
| | - Yang D. Teng
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA 02129, USA
- Department of Neurosurgery, Harvard Medical School, Boston, MA 02115, USA
- Laboratory of SCI, Stem Cell and Recovery Neurobiology Research, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
- Neurotrauma Recovery Research, Spaulding Rehabilitation Hospital Network, Mass General Brigham, Harvard Medical School, Boston, MA 02129, USA
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Vishwanath K, Wilson B, Geetha KM, Murugan V. Polysorbate 80-coated albumin nanoparticles to deliver paclitaxel into the brain to treat glioma. Ther Deliv 2023; 14:193-206. [PMID: 37291872 DOI: 10.4155/tde-2022-0056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023] Open
Abstract
Aim: To develop stable paclitaxel (PTX)-loaded bovine serum albumin (BSA) nanoparticles (BSA-NPs-PTX) as drug-delivery vehicles for delivering paclitaxel into the brain to treat glioma. Methods: This study used PTX-loaded BSA NPs coated with polysorbate 80 (Ps 80) to enhance PTX concentration in the brain. Results: The low IC50 indicated that the fabricated BSA-NPs-PTX and BSA-NPs-PTX-Ps 80 showed significantly enhanced cytotoxicity. The pharmacokinetic and biodistribution analysis of BSA-NPs-PTX and BSA-NPs-PTX 80 showed comparable pharmacokinetic profiles but were significantly different compared with free PTX. Conclusion: BSA-NPs-PTX-Ps 80 exhibited higher plasma concentration-time curves, as compared with BSA-NPs-PTX and PTX. BSA-NPs-PTX and BSA-NPs-PTX-Ps 80 showed significantly improved PTX distribution in the frontal cortex, posterior brain and cerebellum.
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Affiliation(s)
- Kurawattimath Vishwanath
- Department of Pharmaceutics, College of Pharmaceutical Sciences, Dayananda Sagar University, Kumaraswamy Layout, Bangalore, Karnataka, 560078, India
| | - Barnabas Wilson
- Department of Pharmaceutics, College of Pharmaceutical Sciences, Dayananda Sagar University, Kumaraswamy Layout, Bangalore, Karnataka, 560078, India
| | - Kannoth Mukundan Geetha
- Department of Pharmacology, College of Pharmaceutical Sciences, Dayananda Sagar University, Kumaraswamy Layout, Bangalore, Karnataka, 560078, India
| | - Vedigounder Murugan
- Department of Pharmaceutical Chemistry, College of Pharmaceutical Sciences, Dayananda Sagar University, Kumaraswamy Layout, Bangalore, Karnataka, 560078, India
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Kurawattimath V, Wilson B, Geetha KM. Nanoparticle-based drug delivery across the blood-brain barrier for treating malignant brain glioma. OPENNANO 2023. [DOI: 10.1016/j.onano.2023.100128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Noureldine MHA, Shimony N, Jallo GI. Malignant Spinal Tumors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1405:565-581. [PMID: 37452954 DOI: 10.1007/978-3-031-23705-8_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Malignant spinal tumors constitute around 22% of all primary spinal tumors. The most common location of metastases to the spinal region is the extradural compartment. The molecular and genetic characterization of these tumors was the basis for the updated WHO classification of CNS tumors in 2016, where many CNS tumors are now diagnosed according to their genetic profile rather than relying solely on the histopathological appearance. Magnetic resonance imaging (MRI) is the current gold standard for the initial evaluation and subsequent follow-up on intradural spinal cord tumors, and the imaging sequences must include T2-weighted images (WI), short time inversion recovery (STIR), and pre- and post-contrast T1-WI in the axial, sagittal, and coronal planes. The clinical presentation is highly variable and depends on the tumor size, growth rate, type, infiltrative, necrotic and hemorrhagic potential as well as the exact location within the spinal compartment. Surgical intervention remains the mainstay of management of symptomatic and radiographically enlarging spinal tumors, where the goal is to achieve maximal safe resection. Tumor recurrences are managed with repeat surgical resection (preferred whenever possible and safe), radiotherapy, chemotherapy, or any combination of these therapies.
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Affiliation(s)
- Mohammad Hassan A Noureldine
- Department of Neurosurgery and Brain Repair, University of South Florida Morsani College of Medicine, Tampa, FL, USA
- Johns Hopkins University School of Medicine, Institute for Brain Protection Sciences, Johns Hopkins All Children's Hospital, Saint Petersburg, FL, USA
| | - Nir Shimony
- Johns Hopkins University School of Medicine, Institute for Brain Protection Sciences, Johns Hopkins All Children's Hospital, Saint Petersburg, FL, USA
- Geisinger Medical Center, Institute of Neuroscience, Geisinger Commonwealth School of Medicine, Danville, PA, USA
| | - George I Jallo
- Institute for Brain Protections Sciences, Johns Hopkins All Children's Hospital, Saint Petersburg, FL, USA.
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Nanotechnology and Nanocarrier-Based Drug Delivery as the Potential Therapeutic Strategy for Glioblastoma Multiforme: An Update. Cancers (Basel) 2021; 13:cancers13020195. [PMID: 33430494 PMCID: PMC7827410 DOI: 10.3390/cancers13020195] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/20/2020] [Accepted: 01/04/2021] [Indexed: 02/06/2023] Open
Abstract
Simple Summary Glioblastoma multiforme (GBM) are among the most lethal tumors. The highly invasive nature and presence of GBM stem cells, as well as the blood brain barrier (BBB) which limits chemotherapeutic drugs from entering the tumor mass, account for the high chance of treatment failure. Recent developments have found that nanoparticles can be conjugated to liposomes, dendrimers, metal irons, or polymeric micelles, which enhance the drug-loaded compounds to efficiently penetrate the BBB, thus offering new possibilities for overcoming GBM stem cell-mediated resistance to chemotherapy and radiation therapy. In addition, there have been new emerging strategies that use nanocarriers for successful GBM treatment in animal models. This review highlights the recent development of nanotechnology and nanocarrier-based drug delivery for treatment of GBMs, which may be a promising therapeutic strategy for this tumor entity. Abstract Glioblastoma multiforme (GBM) is the most common and malignant brain tumor with poor prognosis. The heterogeneous and aggressive nature of GBMs increases the difficulty of current standard treatment. The presence of GBM stem cells and the blood brain barrier (BBB) further contribute to the most important compromise of chemotherapy and radiation therapy. Current suggestions to optimize GBM patients’ outcomes favor controlled targeted delivery of chemotherapeutic agents to GBM cells through the BBB using nanoparticles and monoclonal antibodies. Nanotechnology and nanocarrier-based drug delivery have recently gained attention due to the characteristics of biosafety, sustained drug release, increased solubility, and enhanced drug bioactivity and BBB penetrability. In this review, we focused on recently developed nanoparticles and emerging strategies using nanocarriers for the treatment of GBMs. Current studies using nanoparticles or nanocarrier-based drug delivery system for treatment of GBMs in clinical trials, as well as the advantages and limitations, were also reviewed.
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Teng YD. Functional multipotency of stem cells: Biological traits gleaned from neural progeny studies. Semin Cell Dev Biol 2019; 95:74-83. [DOI: 10.1016/j.semcdb.2019.02.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 01/24/2019] [Accepted: 02/21/2019] [Indexed: 12/28/2022]
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Xenografting for disease modeling of intramedullary spinal cord tumors: a systematic review. Spinal Cord 2019; 57:439-448. [PMID: 30710121 DOI: 10.1038/s41393-019-0248-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/12/2019] [Accepted: 01/16/2019] [Indexed: 12/17/2022]
Abstract
STUDY DESIGN Systematic review. OBJECTIVES The overall incidence of intramedullary spinal cord tumors (IMSCT) remains low and clinical trials or standardized treatment strategies are missing. Therefore, multiple animal-based xenograft models (AXM) have been developed to foster preclinical research efforts on IMSCT. We constructed a systematic literature review to summarize and compare all AXM for IMSCT, published until April 16, 2018. METHODS The review was conducted using 4 independent research databases following the PRISMA (preferred reporting items for systematic reviews and meta-analyses) guidelines. Studies were included, if they reported on surgical transplantation of tumor cells or tumor tissue to the spinal cord. Methodological study quality was assessed according to the SYRCLE (systematic review center for laboratory animal experimentation) risk of Bias tool. RESULTS Systematic search yielded 20 publications dealing with AXM for IMSCT. In summary, 4 tumor entities were analyzed in 23 experiments using ~337 animals, mainly investigating glioblastoma or gliosarcoma biology. Studies varied regarding the use of engrafted animals, surgical techniques and tumor burden. Most commonly authors used heterotopic, transdural injection of immortalized brain tumor cell lines (1 × 105 in 5 µl) into the thoracic spinal cord of immunocompromised rats. Quality assessment demonstrated an unclear risk of bias in most cases. CONCLUSION Although different AXM for IMSCT have been described so far, one rat model is technically feasible, enables robust experiments and demonstrates reproducible results. However, there is a need for new AXM using orthotopic engraftment of patient-derived tumor cells and for genetically engineered animal models.
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Abstract
Research endeavors originally generated stem cell definitions for the purpose of describing normally sustainable developmental and tissue turnover processes in various species, including humans. The notion of investigating cells that possess a vague capacity of “stamm (phylum)” can be traced back to the late 19th century, mainly concentrating on cells that could produce the germline or the entire blood system. Lately, such undertakings have been recapitulated for oncogenesis, tumor growth, and cancer cell resistance to oncolytic therapies. However, due to the complexity and basic life-origin mechanisms comprising the genetic and epigenetic repertoire of the stemness in every developing or growing cell, presently there are ongoing debates regarding the biological essentials of the stem cell-like tumor initiation cells (ie, cancer stem cells; CSCs). This conceptual analysis focuses on the potential pitfalls of extrapolating that CSCs bear major traits of stemness. We propose a novel nomenclature of Tumor Survival Cells (TSCs) to further define tumor cells behaving like CSCs, based on the ruthless and detrimental features of Cancer Cell Survivology that appears fundamentally different from stem cell biology. Hence, precise academic separation of TSCs from all the stem cell-related labels applied to these unique tumor cells may help to improve scientific reasoning and strategies to decode the desperado-like survival behaviors of TSCs to eventually overcome cancer.
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Affiliation(s)
- Yang D Teng
- 1 Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital Network, Brigham and Women's Hospital, and Massachusetts General Hospital , Boston, Massachusetts.,2 Department of Neurosurgery, Harvard Medical School , Boston, Massachusetts.,3 Division of SCI Research, VA Boston Healthcare System , Boston, Massachusetts
| | - Lei Wang
- 1 Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital Network, Brigham and Women's Hospital, and Massachusetts General Hospital , Boston, Massachusetts.,2 Department of Neurosurgery, Harvard Medical School , Boston, Massachusetts.,3 Division of SCI Research, VA Boston Healthcare System , Boston, Massachusetts
| | - Serdar Kabatas
- 1 Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital Network, Brigham and Women's Hospital, and Massachusetts General Hospital , Boston, Massachusetts.,2 Department of Neurosurgery, Harvard Medical School , Boston, Massachusetts.,3 Division of SCI Research, VA Boston Healthcare System , Boston, Massachusetts
| | - Henning Ulrich
- 4 Departamento de Bioquímica, Instituto de Química , Universidade de São Paulo, São Paulo, Brazil
| | - Ross D Zafonte
- 1 Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital Network, Brigham and Women's Hospital, and Massachusetts General Hospital , Boston, Massachusetts
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Teng YD, Abd-El-Barr M, Wang L, Hajiali H, Wu L, Zafonte RD. Spinal cord astrocytomas: progresses in experimental and clinical investigations for developing recovery neurobiology-based novel therapies. Exp Neurol 2018; 311:135-147. [PMID: 30243796 DOI: 10.1016/j.expneurol.2018.09.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/07/2018] [Accepted: 09/16/2018] [Indexed: 12/25/2022]
Abstract
Spinal cord astrocytomas (SCAs) have discernibly unique signatures in regards to epidemiology, clinical oncological features, genetic markers, pathophysiology, and research and therapeutic challenges. Overall, there are presently very limited clinical management options for high grade SCAs despite progresses made in validating key molecular markers and standardizing tumor classification. The endeavors were aimed to improve diagnosis, therapy design and prognosis assessment, as well as to define more effective oncolytic targets. Efficacious treatment for high grade SCAs still remains an unmet medical demand. This review is therefore focused on research state updates that have been made upon analyzing clinical characteristics, diagnostic classification, genetic and molecular features, tumor initiation cell biology, and current management options for SCAs. Particular emphasis was given to basic and translational research endeavors targeting SCAs, including establishment of experimental models, exploration of unique profiles of SCA stem cell-like tumor survival cells, characterization of special requirements for effective therapeutic delivery into the spinal cord, and development of donor stem cell-based gene-directed enzyme prodrug therapy. We concluded that precise understanding of molecular oncology, tumor survival mechanisms (e.g., drug resistance, metastasis, and cancer stem cells/tumor survival cells), and principles of Recovery Neurobiology can help to create clinically meaningful experimental models of SCAs. Establishment of such systems will expedite the discovery of efficacious therapies that not only kill tumor cells but simultaneously preserve and improve residual neural function.
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Affiliation(s)
- Yang D Teng
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA.
| | - Muhammad Abd-El-Barr
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA; Current affiliation: Department of Neurosurgery, Duke University School of Medicine, Durham, NC, USA
| | - Lei Wang
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA
| | - Hadi Hajiali
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA
| | - Liqun Wu
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA
| | - Ross D Zafonte
- Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School, Spaulding Rehabilitation Hospital and Brigham and Women's Hospital, Division of Spinal Cord Injury Research, VA Boston Healthcare System, Boston, MA, USA
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Glaser T, Han I, Wu L, Zeng X. Targeted Nanotechnology in Glioblastoma Multiforme. Front Pharmacol 2017; 8:166. [PMID: 28408882 PMCID: PMC5374154 DOI: 10.3389/fphar.2017.00166] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 03/14/2017] [Indexed: 01/08/2023] Open
Abstract
Gliomas, and in particular glioblastoma multiforme, are aggressive brain tumors characterized by a poor prognosis and high rates of recurrence. Current treatment strategies are based on open surgery, chemotherapy (temozolomide) and radiotherapy. However, none of these treatments, alone or in combination, are considered effective in managing this devastating disease, resulting in a median survival time of less than 15 months. The efficiency of chemotherapy is mainly compromised by the blood-brain barrier (BBB) that selectively inhibits drugs from infiltrating into the tumor mass. Cancer stem cells (CSCs), with their unique biology and their resistance to both radio- and chemotherapy, compound tumor aggressiveness and increase the chances of treatment failure. Therefore, more effective targeted therapeutic regimens are urgently required. In this article, some well-recognized biological features and biomarkers of this specific subgroup of tumor cells are profiled and new strategies and technologies in nanomedicine that explicitly target CSCs, after circumventing the BBB, are detailed. Major achievements in the development of nanotherapies, such as organic poly(propylene glycol) and poly(ethylene glycol) or inorganic (iron and gold) nanoparticles that can be conjugated to metal ions, liposomes, dendrimers and polymeric micelles, form the main scope of this summary. Moreover, novel biological strategies focused on manipulating gene expression (small interfering RNA and clustered regularly interspaced short palindromic repeats [CRISPR]/CRISPR associated protein 9 [Cas 9] technologies) for cancer therapy are also analyzed. The aim of this review is to analyze the gap between CSC biology and the development of targeted therapies. A better understanding of CSC properties could result in the development of precise nanotherapies to fulfill unmet clinical needs.
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Affiliation(s)
- Talita Glaser
- Department of Biochemistry, Institute of Chemistry, University of São PauloSão Paulo, Brazil
| | - Inbo Han
- Department of Neurosurgery, Spine Center, CHA University, CHA Bundang Medical CenterSeongnam, South Korea
| | - Liquan Wu
- Department of Neurosurgery, Renmin Hospital of Wuhan UniversityWuhan, China
| | - Xiang Zeng
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen UniversityGuangzhou, China
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