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Bagnoli S, Chiavacci E, Cellerino A, Terzibasi Tozzini E. Localization and Characterization of Major Neurogenic Niches in the Brain of the Lesser-Spotted Dogfish Scyliorhinus canicula. Int J Mol Sci 2023; 24:ijms24043650. [PMID: 36835066 PMCID: PMC9967623 DOI: 10.3390/ijms24043650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/06/2023] [Accepted: 02/08/2023] [Indexed: 02/15/2023] Open
Abstract
Adult neurogenesis is defined as the ability of specialized cells in the postnatal brain to produce new functional neurons and to integrate them into the already-established neuronal network. This phenomenon is common in all vertebrates and has been found to be extremely relevant for numerous processes, such as long-term memory, learning, and anxiety responses, and it has been also found to be involved in neurodegenerative and psychiatric disorders. Adult neurogenesis has been studied extensively in many vertebrate models, from fish to human, and observed also in the more basal cartilaginous fish, such as the lesser-spotted dogfish, Scyliorhinus canicula, but a detailed description of neurogenic niches in this animal is, to date, limited to the telencephalic areas. With this article, we aim to extend the characterization of the neurogenic niches of S. canicula in other main areas of the brain: we analyzed via double immunofluorescence sections of telencephalon, optic tectum, and cerebellum with markers of proliferation (PCNA) and mitosis (pH3) in conjunction with glial cell (S100β) and stem cell (Msi1) markers, to identify the actively proliferating cells inside the neurogenic niches. We also labeled adult postmitotic neurons (NeuN) to exclude double labeling with actively proliferating cells (PCNA). Lastly, we observed the presence of the autofluorescent aging marker, lipofuscin, contained inside lysosomes in neurogenic areas.
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Affiliation(s)
- Sara Bagnoli
- Biology Laboratory (BIO@SNS), Scuola Normale Superiore, 56126 Pisa, Italy
| | - Elena Chiavacci
- Biology Laboratory (BIO@SNS), Scuola Normale Superiore, 56126 Pisa, Italy
- Biology and Evolution of Marine Organisms Department (BEOM), Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy
| | - Alessandro Cellerino
- Biology Laboratory (BIO@SNS), Scuola Normale Superiore, 56126 Pisa, Italy
- Fritz Lipmann Institute for Age Research, Leibniz Institute, 07745 Jena, Germany
| | - Eva Terzibasi Tozzini
- Biology and Evolution of Marine Organisms Department (BEOM), Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy
- Correspondence:
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Rahimi-Balaei M, Marzban H, Hawkes R. Early Cerebellar Development in Relation to the Trigeminal System. CEREBELLUM (LONDON, ENGLAND) 2022; 21:784-790. [PMID: 35237930 DOI: 10.1007/s12311-022-01388-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Despite the wealth of knowledge of adult cerebellar connectivity, little is known about the developmental mechanisms that underpin its development. Early connectivity is important because it is the foundation of the neural networks crucial for neuronal function and serves as a scaffold on which later tracts form. Conventionally, it is believed that afferents from the vestibular system are the first to invade the cerebellum, at embryonic days (E) 11-E12/13 in mice, where they target the new born Purkinje cells. However, we have demonstrated that pioneer axons that originate from the trigeminal ganglia are already present in the cerebellar primordium by E9, a stage at which afferents from the vestibular ganglia have not yet reached the brainstem, where they target neurons of the cerebellar nuclei. An early-born subset of cerebellar nuclei may be derived from the mesencephalon. These may be the target of the earliest pioneer axons. They form the early connectivity at the rostral end. This is consistent with the notion that the formation of the antero-posterior axis follows a rostro-caudal sequence. The finding that trigeminal ganglion-derived pioneer axons enter the cerebellar primordium before Purkinje cells are born and target the cerebellar nuclei, reveals a novel perspective on the development of early cerebellar connectivity.
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Affiliation(s)
- Maryam Rahimi-Balaei
- Department of Human Anatomy and Cell Science, The Children's Hospital Research Institute of Manitoba (CHRIM), Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Rm 129 BMSB, 745 Bannatyne Avenue, Winnipeg, MB, R3E 0J9, Canada
| | - Hassan Marzban
- Department of Human Anatomy and Cell Science, The Children's Hospital Research Institute of Manitoba (CHRIM), Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Rm 129 BMSB, 745 Bannatyne Avenue, Winnipeg, MB, R3E 0J9, Canada.
| | - Richard Hawkes
- Department of Cell Biology & Anatomy and Hotchkiss Brain Institute, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada
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Fritzsch B, Elliott KL, Yamoah EN. Neurosensory development of the four brainstem-projecting sensory systems and their integration in the telencephalon. Front Neural Circuits 2022; 16:913480. [PMID: 36213204 PMCID: PMC9539932 DOI: 10.3389/fncir.2022.913480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 08/23/2022] [Indexed: 11/18/2022] Open
Abstract
Somatosensory, taste, vestibular, and auditory information is first processed in the brainstem. From the brainstem, the respective information is relayed to specific regions within the cortex, where these inputs are further processed and integrated with other sensory systems to provide a comprehensive sensory experience. We provide the organization, genetics, and various neuronal connections of four sensory systems: trigeminal, taste, vestibular, and auditory systems. The development of trigeminal fibers is comparable to many sensory systems, for they project mostly contralaterally from the brainstem or spinal cord to the telencephalon. Taste bud information is primarily projected ipsilaterally through the thalamus to reach the insula. The vestibular fibers develop bilateral connections that eventually reach multiple areas of the cortex to provide a complex map. The auditory fibers project in a tonotopic contour to the auditory cortex. The spatial and tonotopic organization of trigeminal and auditory neuron projections are distinct from the taste and vestibular systems. The individual sensory projections within the cortex provide multi-sensory integration in the telencephalon that depends on context-dependent tertiary connections to integrate other cortical sensory systems across the four modalities.
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Affiliation(s)
- Bernd Fritzsch
- Department of Biology, The University of Iowa, Iowa City, IA, United States
- Department of Otolaryngology, The University of Iowa, Iowa City, IA, United States
- *Correspondence: Bernd Fritzsch,
| | - Karen L. Elliott
- Department of Biology, The University of Iowa, Iowa City, IA, United States
| | - Ebenezer N. Yamoah
- Department of Physiology and Cell Biology, School of Medicine, University of Nevada, Reno, Reno, NV, United States
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Zhao YJ, Liu Y, Wang J, Li Q, Zhang ZM, Tu T, Lei R, Zhang M, Chen YJ. Activation of the Mesencephalic Trigeminal Nucleus Contributes to Masseter Hyperactivity Induced by Chronic Restraint Stress. Front Cell Neurosci 2022; 16:841133. [PMID: 35480958 PMCID: PMC9035558 DOI: 10.3389/fncel.2022.841133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/11/2022] [Indexed: 12/12/2022] Open
Abstract
Psychological stress is commonly accepted to be closely associated with masticatory muscle disorder, which is the main symptom of temporomandibular disorder (TMD). Previous studies have confirmed that exposure to stress may cause masticatory muscle hyperactivity. However, the central mechanism underlying this process remains unclear. The mesencephalic trigeminal nucleus (Vme), which resides in the brainstem, is the primary afferent center for masticatory proprioception and plays a key role in oral–motor movements by projecting to the trigeminal motor nucleus (Vmo). Therefore, the present study was designed to examine the role of Vme neurons in masseter overactivity induced by chronic stress. We found that subjecting mice to restraint stress (6 h/day) for 14 days caused significant anxiety-like behavior, obvious masseter overactivity, and markedly enhanced electrophysiological excitability of Vme neurons. By using anterograde tract tracing combined with immunofluorescence staining methods, we observed vesicular glutamate transporter 1 (VGLUT1)-positive glutamatergic projections from the Vme to the Vmo. Moreover, chronic restraint stress (CRS) elevated the expression of VGLUT1 and choline acetyltransferase (ChAT) in Vmo. Furthermore, administration of VGLUT1-targeted short hairpin RNA (shRNA) into the bilateral Vme significantly suppressed the enhanced overexcitability of Vme neurons, downregulated the overexpression of VGLUT1 and ChAT in the Vmo, and attenuated the elevated overactivity of the masseter caused by CRS. Taken together, we showed that CRS can excite neurons in the Vme, enhancing glutamatergic excitatory projections from the Vme to the Vmo and resulting in masseter muscle overactivity. These findings provide us with a novel central mechanism underlying the correlation between psychological factors and TMD.
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Affiliation(s)
- Ya-Juan Zhao
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Yang Liu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Jian Wang
- Department of Cardiothoracic Surgery, General Hospital of Western Theater Command, Chengdu, China
| | - Qiang Li
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Zhou-Ming Zhang
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Teng Tu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Rong Lei
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
| | - Min Zhang
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
- Min Zhang,
| | - Yong-Jin Chen
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi’an, China
- *Correspondence: Yong-Jin Chen,
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Sato K. Why is the mesencephalic nucleus of the trigeminal nerve situated inside the brain? Med Hypotheses 2021; 153:110626. [PMID: 34130114 DOI: 10.1016/j.mehy.2021.110626] [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] [Received: 03/30/2021] [Revised: 05/24/2021] [Accepted: 06/03/2021] [Indexed: 11/18/2022]
Abstract
Primary sensory neurons are usually situated in ganglia outside the brain, while the mesencephalic nucleus of the trigeminal nerve (Me5) is situated inside the brain. However, it remains unknown why only Me5 situated inside the brain is. The neurons of Me5 are the cell bodies of primary afferent fibers concerned with the muscles of mastication and periodontal receptors of both maxillary and mandibular teeth. Interestingly, there was no Me5 till the evolution level of the agnatha, vertebrates which lack jaws, while Me5 appeared with the evolution of jawed vertebrates, the gnathostomes. Thus, I speculate that the appearance of jaws necessitated the emergence of a novel sensory system including newly-made primary sensory neurons to co-ordinate jaw movement and this need was met by the appearance of Me5. Although primary sensory neurons are usually generated from the neural crest or the neurogenic placodes, primary sensory neurons in Me5 are derived from neuroepithelium of the dorsal midline of the midbrain. Taken together, I propose the following hypothesis; (1) Me5 did not exist till the evolution level of agnatha, which lacks jaw. (2) When jawed vertebrates evolved, a new sensory system including new primary sensory neurons for mastication was needed. (3) At that point, there was no capacity for the neural crest and neurogenic placodes to make primary sensory neurons. (4) However, there remained capacity only for the neuroepithelium of the midbrain to make primary sensory neurons. (5) Thus, Me5 was newly made inside the CNS.
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Affiliation(s)
- Kohji Sato
- Department of Organ & Tissue Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashiku, Hamamatsu, Shizuoka 431-3192, Japan.
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Parmhans N, Fuller AD, Nguyen E, Chuang K, Swygart D, Wienbar SR, Lin T, Kozmik Z, Dong L, Schwartz GW, Badea TC. Identification of retinal ganglion cell types and brain nuclei expressing the transcription factor Brn3c/Pou4f3 using a Cre recombinase knock-in allele. J Comp Neurol 2020; 529:1926-1953. [PMID: 33135183 DOI: 10.1002/cne.25065] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 12/12/2022]
Abstract
Members of the POU4F/Brn3 transcription factor family have an established role in the development of retinal ganglion cell (RGCs) types, the main transducers of visual information from the mammalian eye to the brain. Our previous work using sparse random recombination of a conditional knock-in reporter allele expressing alkaline phosphatase (AP) and intersectional genetics had identified three types of Brn3c positive (Brn3c+ ) RGCs. Here, we describe a novel Brn3cCre mouse allele generated by serial Dre to Cre recombination and use it to explore the expression overlap of Brn3c with Brn3a and Brn3b and the dendritic arbor morphologies and visual stimulus response properties of Brn3c+ RGC types. Furthermore, we explore brain nuclei that express Brn3c or receive input from Brn3c+ neurons. Our analysis reveals a much larger number of Brn3c+ RGCs and more diverse set of RGC types than previously reported. Most RGCs expressing Brn3c during development are still Brn3c positive in the adult, and all express Brn3a while only about half express Brn3b. Genetic Brn3c-Brn3b intersection reveals an area of increased RGC density, extending from dorsotemporal to ventrolateral across the retina and overlapping with the mouse binocular field of view. In addition, we report a Brn3c+ RGC projection to the thalamic reticular nucleus, a visual nucleus that was not previously shown to receive retinal input. Furthermore, Brn3c+ neurons highlight a previously unknown subdivision of the deep mesencephalic nucleus. Thus, our newly generated allele provides novel biological insights into RGC type classification, brain connectivity, and cytoarchitectonic.
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Affiliation(s)
- Nadia Parmhans
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - Anne Drury Fuller
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - Eileen Nguyen
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - Katherine Chuang
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - David Swygart
- Departments of Ophthalmology and Physiology Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA
| | - Sophia Rose Wienbar
- Departments of Ophthalmology and Physiology Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA
| | - Tyger Lin
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - Zbynek Kozmik
- Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Lijin Dong
- Genetic Engineering Facility, National Eye Institute, NIH, Bethesda, Maryland, USA
| | - Gregory William Schwartz
- Departments of Ophthalmology and Physiology Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA
| | - Tudor Constantin Badea
- Retinal Circuit Development and Genetics Unit, Neurobiology-Neurodegeneration and Repair Laboratory, National Eye Institute, NIH, Bethesda, Maryland, USA
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Ter-Avetisyan G, Dumoulin A, Herrel A, Schmidt H, Strump J, Afzal S, Rathjen FG. Loss of Axon Bifurcation in Mesencephalic Trigeminal Neurons Impairs the Maximal Biting Force in Npr2-Deficient Mice. Front Cell Neurosci 2018; 12:153. [PMID: 29962937 PMCID: PMC6013911 DOI: 10.3389/fncel.2018.00153] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 05/16/2018] [Indexed: 11/13/2022] Open
Abstract
Bifurcation of axons from dorsal root ganglion (DRG) and cranial sensory ganglion (CSG) neurons is mediated by a cGMP-dependent signaling pathway composed of the ligand C-type natriuretic peptide (CNP), the receptor guanylyl cyclase Npr2 and the cGMP-dependent protein kinase I (cGKI). Here, we demonstrate that mesencephalic trigeminal neurons (MTN) which are the only somatosensory neurons whose cell bodies are located within the CNS co-express Npr2 and cGKI. Afferents of MTNs form Y-shaped branches in rhombomere 2 where the ligand CNP is expressed. Analyzing mouse mutants deficient for CNP or Npr2 we found that in the absence of CNP-induced cGMP signaling MTN afferents no longer bifurcate and instead extend either into the trigeminal root or caudally in the hindbrain. Since MTNs provide sensory information from jaw closing muscles and periodontal ligaments we measured the bite force of conditional mouse mutants of Npr2 (Npr2flox/flox;Engr1Cre ) that lack bifurcation of MTN whereas the bifurcation of trigeminal afferents is normal. Our study revealed that the maximal biting force of both sexes is reduced in Npr2flox/flox;Engr1Cre mice as compared to their Npr2flox/flox littermate controls. In conclusion sensory feedback mechanisms from jaw closing muscles or periodontal ligaments might be impaired in the absence of MTN axon bifurcation.
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Affiliation(s)
| | | | - Anthony Herrel
- Département Adaptations du Vivant, UMR 7179 Centre National de la Recherche Scientifique/MNHN, Paris, France
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