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Neckles VN, Feliciano DM. From seed to flower: blossoming of microglia in development and brain repair. Cell Tissue Res 2021; 387:377-389. [PMID: 34151391 DOI: 10.1007/s00441-021-03486-9] [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: 02/01/2021] [Accepted: 06/09/2021] [Indexed: 12/23/2022]
Abstract
Physiological functions require coordination of processes between diverse organs, tissues, and cells. This integrative view of science has reemerged complementary to the reductionist philosophy of studying individual cell types. An integrative approach has proven particularly powerful within the field of neuroscience where, intermingled among the most numerous neural cell types of the brain, are immune cells called microglia. Microglia act as a line of defense in the CNS by phagocytizing harmful pathogens and cellular debris and by releasing a variety of factors that mediate immune responses. However, microglia are also appreciated as critical mediators of neurophysiology making them a desired target to rectify neuropathological states. The goal of this review is to discuss microglia ontogenesis, referred to as microgliogenesis, a term that encompasses the events that drive the production, differentiation, migration, and maturation of microglia and opportunities to target microglia for brain repair.
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Affiliation(s)
- Victoria N Neckles
- Department of Biological Sciences, Clemson University, Clemson, SC, 29634-0314, USA
| | - David M Feliciano
- Department of Biological Sciences, Clemson University, Clemson, SC, 29634-0314, USA.
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52
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Opportunities and challenges for microRNA-targeting therapeutics for epilepsy. Trends Pharmacol Sci 2021; 42:605-616. [PMID: 33992468 DOI: 10.1016/j.tips.2021.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 03/30/2021] [Accepted: 04/19/2021] [Indexed: 12/19/2022]
Abstract
Epilepsy is a common and serious neurological disorder characterised by recurrent spontaneous seizures. Frontline pharmacotherapy includes small-molecule antiseizure drugs that typically target ion channels and neurotransmitter systems, but these fail in 30% of patients and do not prevent either the development or progression of epilepsy. An emerging therapeutic target is microRNA (miRNA), small noncoding RNAs that negatively regulate sets of proteins. Their multitargeting action offers unique advantages for certain forms of epilepsy with complex underlying pathophysiology, such as temporal lobe epilepsy (TLE). miRNA can be inhibited by designed antisense oligonucleotides (ASOs; e.g., antimiRs). Here, we outline the prospects for miRNA-based therapies. We review design considerations for nucleic acid-based approaches and the challenges and next steps in developing therapeutic miRNA-targeting molecules for epilepsy.
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53
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Jan AT, Rahman S, Badierah R, Lee EJ, Mattar EH, Redwan EM, Choi I. Expedition into Exosome Biology: A Perspective of Progress from Discovery to Therapeutic Development. Cancers (Basel) 2021; 13:1157. [PMID: 33800282 PMCID: PMC7962655 DOI: 10.3390/cancers13051157] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/01/2021] [Accepted: 03/03/2021] [Indexed: 02/07/2023] Open
Abstract
Exosomes are membrane-enclosed distinct cellular entities of endocytic origin that shuttle proteins and RNA molecules intercellularly for communication purposes. Their surface is embossed by a huge variety of proteins, some of which are used as diagnostic markers. Exosomes are being explored for potential drug delivery, although their therapeutic utilities are impeded by gaps in knowledge regarding their formation and function under physiological condition and by lack of methods capable of shedding light on intraluminal vesicle release at the target site. Nonetheless, exosomes offer a promising means of developing systems that enable the specific delivery of therapeutics in diseases like cancer. This review summarizes information on donor cell types, cargoes, cargo loading, routes of administration, and the engineering of exosomal surfaces for specific peptides that increase target specificity and as such, therapeutic delivery.
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Affiliation(s)
- Arif Tasleem Jan
- School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri 185234, India;
| | - Safikur Rahman
- Department of Botany, MS College, BR Ambedkar Bihar University, Muzaffarpur, Bihar 842001, India;
| | - Raied Badierah
- Biological Sciences Department, Faculty of Science, and Laboratory University Hospital, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (R.B.); (E.H.M.)
| | - Eun Ju Lee
- Department of Medical Biotechnology and Research Institute of Cell Culture, Yeungnam University, Gyeongsan 38541, Korea;
| | - Ehab H. Mattar
- Biological Sciences Department, Faculty of Science, and Laboratory University Hospital, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (R.B.); (E.H.M.)
| | - Elrashdy M. Redwan
- Biological Sciences Department, Faculty of Science, and Laboratory University Hospital, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (R.B.); (E.H.M.)
| | - Inho Choi
- Department of Medical Biotechnology and Research Institute of Cell Culture, Yeungnam University, Gyeongsan 38541, Korea;
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Crews FT, Zou J, Coleman LG. Extracellular microvesicles promote microglia-mediated pro-inflammatory responses to ethanol. J Neurosci Res 2021; 99:1940-1956. [PMID: 33611821 PMCID: PMC8451840 DOI: 10.1002/jnr.24813] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 02/01/2021] [Indexed: 12/11/2022]
Abstract
Alcohol use disorder (AUD) pathology features pro-inflammatory gene induction and microglial activation. The underlying cellular processes that promote this activation remain unclear. Previously considered cellular debris, extracellular vesicles (EVs) have emerged as mediators of inflammatory signaling in several disease states. We investigated the role of microvesicles (MVs, 50 nm-100 µm diameter EVs) in pro-inflammatory and microglial functional gene expression using primary organotypic brain slice culture (OBSC). Ethanol caused a unique immune gene signature that featured: temporal induction of pro-inflammatory TNF-α and IL-1β, reduction of homeostatic microglia state gene Tmem119, progressive increases in purinergic receptor P2RY12 and the microglial inhibitory fractalkine receptor CX3CR1, an increase in the microglial presynaptic gene C1q, and a reduction in the phagocytic gene TREM2. MV signaling was implicated in this response as reduction of MV secretion by imipramine blocked pro-inflammatory TNF-α and IL-1β induction by ethanol, and ethanol-conditioned MVs (EtOH-MVs) reproduced the ethanol-associated immune gene signature in naïve OBSC slices. Depletion of microglia prior to ethanol treatment prevented pro-inflammatory activity of EtOH-MVs, as did incubation of EtOH-MVs with the HMGB1 inhibitor glycyrrhizin. Ethanol caused HMGB1 secretion from cultured BV2 microglia in MVs through activation of PI3 kinase. In summary, these studies find MVs modulate pro-inflammatory gene induction and microglial activation changes associated with ethanol. Thus, MVs may represent a novel therapeutic target to reduce neuroinflammation in the setting of alcohol abuse or other diseases that feature a neuroimmune component. [Correction added on 5 April 2021, after first online publication: The copyright line was changed.].
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Affiliation(s)
- Fulton T Crews
- Bowles Center for Alcohol Studies, The University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, USA.,Department of Pharmacology, The University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, USA.,Department of Psychiatry, The University of North Carolina, School of Medicine, Chapel Hill, NC, USA
| | - Jian Zou
- Bowles Center for Alcohol Studies, The University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, USA
| | - Leon G Coleman
- Bowles Center for Alcohol Studies, The University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, USA.,Department of Pharmacology, The University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, USA
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Brain-Derived Extracellular Vesicles in Health and Disease: A Methodological Perspective. Int J Mol Sci 2021; 22:ijms22031365. [PMID: 33573018 PMCID: PMC7866382 DOI: 10.3390/ijms22031365] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/22/2021] [Accepted: 01/25/2021] [Indexed: 02/07/2023] Open
Abstract
Extracellular vesicles (EVs) are double membrane structures released by presumably all cell types that transport and deliver lipids, proteins, and genetic material to near or distant recipient cells, thereby affecting their phenotype. The basic knowledge of their functions in healthy and diseased brain is still murky and many questions about their biology are unsolved. In neurological diseases, EVs are regarded as attractive biomarkers and as therapeutic tools due to their ability to cross the blood–brain barrier (BBB). EVs have been successfully isolated from conditioned media of primary brain cells and cerebrospinal fluid (CSF), but protocols allowing for the direct study of pathophysiological events mediated or influenced by EVs isolated from brain have only recently been published. This review aims to give a brief overview of the current knowledge of EVs’ functions in the central nervous system (CNS) and the current protocols to isolate brain-derived EVs (BDEVs) used in different publications. By comparing the proteomic analysis of some of these publications, we also assess the influence of the isolation method on the protein content of BDEVs.
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Kumar A, Zhou L, Zhi K, Raji B, Pernell S, Tadrous E, Kodidela S, Nookala A, Kochat H, Kumar S. Challenges in Biomaterial-Based Drug Delivery Approach for the Treatment of Neurodegenerative Diseases: Opportunities for Extracellular Vesicles. Int J Mol Sci 2020; 22:E138. [PMID: 33375558 PMCID: PMC7795247 DOI: 10.3390/ijms22010138] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/19/2020] [Accepted: 12/21/2020] [Indexed: 02/06/2023] Open
Abstract
Biomaterials have been the subject of numerous studies to pursue potential therapeutic interventions for a wide variety of disorders and diseases. The physical and chemical properties of various materials have been explored to develop natural, synthetic, or semi-synthetic materials with distinct advantages for use as drug delivery systems for the central nervous system (CNS) and non-CNS diseases. In this review, an overview of popular biomaterials as drug delivery systems for neurogenerative diseases is provided, balancing the potential and challenges associated with the CNS drug delivery. As an effective drug delivery system, desired properties of biomaterials are discussed, addressing the persistent challenges such as targeted drug delivery, stimuli responsiveness, and controlled drug release in vivo. Finally, we discuss the prospects and limitations of incorporating extracellular vesicles (EVs) as a drug delivery system and their use for biocompatible, stable, and targeted delivery with limited immunogenicity, as well as their ability to be delivered via a non-invasive approach for the treatment of neurodegenerative diseases.
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Affiliation(s)
- Asit Kumar
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
| | - Lina Zhou
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
| | - Kaining Zhi
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, Memphis, TN 38104, USA; (K.Z.); (B.R.); (H.K.)
| | - Babatunde Raji
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, Memphis, TN 38104, USA; (K.Z.); (B.R.); (H.K.)
| | - Shelby Pernell
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
| | - Erene Tadrous
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
| | - Sunitha Kodidela
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
| | | | - Harry Kochat
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, Memphis, TN 38104, USA; (K.Z.); (B.R.); (H.K.)
| | - Santosh Kumar
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (L.Z.); (S.P.); (E.T.); (S.K.)
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Diana A, Gaido G, Maxia C, Murtas D. MicroRNAs at the Crossroad of the Dichotomic Pathway Cell Death vs. Stemness in Neural Somatic and Cancer Stem Cells: Implications and Therapeutic Strategies. Int J Mol Sci 2020; 21:E9630. [PMID: 33348804 PMCID: PMC7766058 DOI: 10.3390/ijms21249630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/05/2020] [Accepted: 12/10/2020] [Indexed: 12/12/2022] Open
Abstract
Stemness and apoptosis may highlight the dichotomy between regeneration and demise in the complex pathway proceeding from ontogenesis to the end of life. In the last few years, the concept has emerged that the same microRNAs (miRNAs) can be concurrently implicated in both apoptosis-related mechanisms and cell differentiation. Whether the differentiation process gives rise to the architecture of brain areas, any long-lasting perturbation of miRNA expression can be related to the occurrence of neurodevelopmental/neuropathological conditions. Moreover, as a consequence of neural stem cell (NSC) transformation to cancer stem cells (CSCs), the fine modulation of distinct miRNAs becomes necessary. This event implies controlling the expression of pro/anti-apoptotic target genes, which is crucial for the management of neural/neural crest-derived CSCs in brain tumors, neuroblastoma, and melanoma. From a translational point of view, the current progress on the emerging miRNA-based neuropathology therapeutic applications and antitumor strategies will be disclosed and their advantages and shortcomings discussed.
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Affiliation(s)
- Andrea Diana
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
| | | | - Cristina Maxia
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
| | - Daniela Murtas
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
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