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Takahashi M, Sugiuchi Y, Shinoda Y. Brainstem Neural Circuits Triggering Vertical Saccades and Fixation. J Neurosci 2024; 44:e1657232023. [PMID: 37968118 PMCID: PMC10851683 DOI: 10.1523/jneurosci.1657-23.2023] [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: 08/28/2023] [Revised: 10/27/2023] [Accepted: 10/28/2023] [Indexed: 11/17/2023] Open
Abstract
Neurons in the nucleus raphe interpositus have tonic activity that suppresses saccadic burst neurons (BNs) during eye fixations, and that is inhibited before and during saccades in all directions (omnipause neurons, OPNs). We have previously demonstrated via intracellular recording and anatomical staining in anesthetized cats of both sexes that OPNs are inhibited by BNs in the medullary reticular formation (horizontal inhibitory BNs, IBNs). These horizontal IBNs receive monosynaptic input from the caudal horizontal saccade area of the superior colliculus (SC), and then produce monosynaptic inhibition in OPNs, providing a mechanism to trigger saccades. However, it is well known that the neural circuits driving horizontal components of saccades are independent from the circuits driving vertical components. Thus, our previous results are unable to explain how purely vertical saccades are triggered. Here, we again apply intracellular recording to show that a disynaptic vertical IBN circuit exists, analogous to the horizontal circuit. Specifically, we show that stimulation of the SC rostral vertical saccade area produces disynaptic inhibition in OPNs, which is not abolished by midline section between the horizontal IBNs. This excludes the possibility that horizontal IBNs could be responsible for the OPN inhibition during vertical saccades. We then show that vertical IBNs in the interstitial nucleus of Cajal, which receive monosynaptic input from rostral SC, are responsible for the disynaptic inhibition of OPNs. These results indicate that a similarly functioning SC-IBN-OPN circuit exists for both the horizontal and vertical oculomotor pathways. These two IBN-mediated circuits are capable of triggering saccades in any direction.Significance Statement Saccades shift gaze to objects of interest, moving their image to the central retina, where it is maintained for detailed examination (fixation). During fixation, high gain saccade burst neurons (BNs) are tonically inhibited by omnipause neurons (OPNs). Our previous study showed that medullary horizontal inhibitory BNs (IBNs) activated from the caudal superior colliculus (SC) inhibit tonically active OPNs in order to initiate horizontal saccades. The present study addresses the source of OPN inhibition for vertical saccades. We find that OPNs monosynaptically inhibit vertical IBNs in the interstitial nucleus of Cajal during fixation. Those same vertical IBNs are activated by the rostral SC, and inhibit OPN activity to initiate vertical saccades.
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Affiliation(s)
- M Takahashi
- Department of Systems Neurophysiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Y Sugiuchi
- Department of Systems Neurophysiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Y Shinoda
- Department of Systems Neurophysiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
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Winter AW, Salimi A, Ospina LH, Roos JCP. Ophthalmic manifestations of Gaucher disease: the most common lysosomal storage disorder. Br J Ophthalmol 2019; 103:315-326. [PMID: 30612093 DOI: 10.1136/bjophthalmol-2018-312846] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 11/07/2018] [Accepted: 11/24/2018] [Indexed: 11/04/2022]
Abstract
Gaucher disease (GD) results from a deficiency of glucocerebrosidase activity and the subsequent accumulation of the enzyme's metabolites, principally glucosylsphingosine and glucosylceramide. There are three principal forms: Type I, which is the most common, is usually considered non-neuronopathic. Type II, III and IIIc manifest earlier and have neurological sequelae due to markedly reduced enzyme activity. Gaucher's can be associated with ophthalmological sequelae but these have not been systematically reviewed. We therefore performed a comprehensive literature review of all such ophthalmic abnormalities associated with the different types of Gaucher disease. We systematically searched the literature (1950 - present) for functional and structural ocular abnormalities arising in patients with Gaucher disease and found that all subtypes can be associated with ophthalmic abnormalities; these range from recently described intraocular lesions to disease involving the adnexae, peripheral nerves and brain. In summary, Gaucher can affect most parts of the eye. Rarely is it sight-threatening; some but not all manifestations are amenable to treatment, including with enzyme replacement and substrate reduction therapy. Retinal involvement is rare but patients with ocular manifestations should be monitored and treated early to reduce the risk of progression and further complications. As Gaucher disease is also associated with Parkinsons disease and may also confer an increased risk of malignancy (particularly haematological forms and melanoma), any ocular abnormalities should be fully investigated to exclude these potential underlying conditions.
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Affiliation(s)
- Aaron W Winter
- Department of Ophthalmology and Visual Sciences, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Ali Salimi
- Faculty of Medicine, McGill University, Montréal, Québec, Canada
| | - Luis H Ospina
- Department of Pediatric Ophthalmology and Neuro-Ophthalmology, Sainte-Justine Hospital, University of Montréal, Montréal, Québec, Canada
| | - Jonathan C P Roos
- Department of Ophthalmology, Norfolk & Norwich University Hospitals, Norfolk, UK .,Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
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Narita A, Shirai K, Kubota N, Takayama R, Takahashi Y, Onuki T, Numakura C, Kato M, Hamada Y, Sakai N, Ohno A, Asami M, Matsushita S, Hayashi A, Kumada T, Fujii T, Horino A, Inoue T, Kuki I, Asakawa K, Ishikawa H, Ohno K, Nishimura Y, Tamasaki A, Maegaki Y, Ohno K. Abnormal pupillary light reflex with chromatic pupillometry in Gaucher disease. Ann Clin Transl Neurol 2014; 1:135-40. [PMID: 25356393 PMCID: PMC4212477 DOI: 10.1002/acn3.33] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 12/20/2013] [Accepted: 12/20/2013] [Indexed: 11/13/2022] Open
Abstract
The hallmark of neuronopathic Gaucher disease (GD) is oculomotor abnormalities, but ophthalmological assessment is difficult in uncooperative patients. Chromatic pupillometry is a quantitative method to assess the pupillary light reflex (PLR) with minimal patient cooperation. Thus, we investigated whether chromatic pupillometry could be useful for neurological evaluations in GD. In our neuronopathic GD patients, red light-induced PLR was markedly impaired, whereas blue light-induced PLR was relatively spared. In addition, patients with non-neuronopathic GD showed no abnormalities. These novel findings show that chromatic pupillometry is a convenient method to detect neurological signs and monitor the course of disease in neuronopathic GD.
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Affiliation(s)
- Aya Narita
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Kentarou Shirai
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Norika Kubota
- Department of Pediatrics, National Hospital Organization Matsue Medical Center Shimane, Japan
| | - Rumiko Takayama
- Department of Clinical Research, National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders Shizuoka, Japan
| | - Yukitoshi Takahashi
- Department of Clinical Research, National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders Shizuoka, Japan
| | - Takanori Onuki
- Department of Pediatrics, Yamagata University School of Medicine Yamagata, Japan
| | - Chikahiko Numakura
- Department of Pediatrics, Yamagata University School of Medicine Yamagata, Japan
| | - Mitsuhiro Kato
- Department of Pediatrics, Yamagata University School of Medicine Yamagata, Japan
| | - Yusuke Hamada
- Department of Pediatrics, Osaka University Graduate School of Medicine Osaka, Japan
| | - Norio Sakai
- Department of Pediatrics, Osaka University Graduate School of Medicine Osaka, Japan
| | - Atsuko Ohno
- Department of Pediatric Neurology, Aichi Children's Health and Medical Center Aichi, Japan
| | - Maya Asami
- Department of Pediatrics, School of Medicine, Iwate Medical University Morioka, Japan
| | - Shoko Matsushita
- Department of Pediatrics, School of Medicine, Iwate Medical University Morioka, Japan
| | - Anri Hayashi
- Department of Pediatrics, Shiga Medical Center for Children Shiga, Japan
| | - Tomohiro Kumada
- Department of Pediatrics, Shiga Medical Center for Children Shiga, Japan
| | - Tatsuya Fujii
- Department of Pediatrics, Shiga Medical Center for Children Shiga, Japan
| | - Asako Horino
- Department of Pediatric Neurology, Children's Medical Center, Osaka City General Hospital Osaka, Japan
| | - Takeshi Inoue
- Department of Pediatric Neurology, Children's Medical Center, Osaka City General Hospital Osaka, Japan
| | - Ichiro Kuki
- Department of Pediatric Neurology, Children's Medical Center, Osaka City General Hospital Osaka, Japan
| | - Ken Asakawa
- Department of Orthoptics and Visual Sciences, Kitasato University School of Allied Health Sciences Kanagawa, Japan
| | - Hitoshi Ishikawa
- Department of Orthoptics and Visual Sciences, Kitasato University School of Allied Health Sciences Kanagawa, Japan
| | - Koyo Ohno
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Yoko Nishimura
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Akiko Tamasaki
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Yoshihiro Maegaki
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
| | - Kousaku Ohno
- Division of Child Neurology, Institute of Neurological Science, Tottori University Faculty of Medicine Yonago, Japan
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Ginns EI, Mak SKK, Ko N, Karlgren J, Akbarian S, Chou VP, Guo Y, Lim A, Samuelsson S, LaMarca ML, Vazquez-DeRose J, Manning-Boğ AB. Neuroinflammation and α-synuclein accumulation in response to glucocerebrosidase deficiency are accompanied by synaptic dysfunction. Mol Genet Metab 2014; 111:152-62. [PMID: 24388731 DOI: 10.1016/j.ymgme.2013.12.003] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 12/04/2013] [Accepted: 12/05/2013] [Indexed: 12/28/2022]
Abstract
Clinical, epidemiological and experimental studies confirm a connection between the common degenerative movement disorder Parkinson's disease (PD) that affects over 1 million individuals, and Gaucher disease, the most prevalent lysosomal storage disorder. Recently, human imaging studies have implicated impaired striatal dopaminergic neurotransmission in early PD pathogenesis in the context of Gaucher disease mutations, but the underlying mechanisms have yet to be characterized. In this report we describe and characterize two novel long-lived transgenic mouse models of Gba deficiency, along with a subchronic conduritol-ß-epoxide (CBE) exposure paradigm. All three murine models revealed striking glial activation within nigrostriatal pathways, accompanied by abnormal α-synuclein accumulation. Importantly, the CBE-induced, pharmacological Gaucher mouse model replicated this change in dopamine neurotransmission, revealing a markedly reduced evoked striatal dopamine release (approximately 2-fold) that indicates synaptic dysfunction. Other changes in synaptic plasticity markers, including microRNA profile and a 24.9% reduction in post-synaptic density size, were concomitant with diminished evoked dopamine release following CBE exposure. These studies afford new insights into the mechanisms underlying the Parkinson's-Gaucher disease connection, and into the physiological impact of related abnormal α-synuclein accumulation and neuroinflammation on nigrostriatal dopaminergic neurotransmission.
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Affiliation(s)
- Edward I Ginns
- Lysosomal Disorders Treatment and Research Program, Clinical Labs, University of Massachusetts Medical School, Worcester, MA 01545, USA; Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA 01545, USA; Clinical Neuroscience Branch, IRP, NIMH, Bethesda, MD 20892, USA
| | - Sally K-K Mak
- Center for Health Sciences, Biosciences Division, SRI International, Menlo Park, CA 94025, USA
| | - Novie Ko
- Center for Health Sciences, Biosciences Division, SRI International, Menlo Park, CA 94025, USA
| | - Juliane Karlgren
- Lysosomal Disorders Treatment and Research Program, Clinical Labs, University of Massachusetts Medical School, Worcester, MA 01545, USA
| | - Schahram Akbarian
- Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA 01545, USA
| | - Vivian P Chou
- Center for Health Sciences, Biosciences Division, SRI International, Menlo Park, CA 94025, USA
| | - Yin Guo
- Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA 01545, USA
| | - Arlene Lim
- Lysosomal Disorders Treatment and Research Program, Clinical Labs, University of Massachusetts Medical School, Worcester, MA 01545, USA; Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA 01545, USA
| | - Steven Samuelsson
- Center for Neuroscience, Biosciences Division, SRI International, Menlo Park, CA 94025, USA
| | - Mary L LaMarca
- Clinical Neuroscience Branch, IRP, NIMH, Bethesda, MD 20892, USA
| | | | - Amy B Manning-Boğ
- Center for Health Sciences, Biosciences Division, SRI International, Menlo Park, CA 94025, USA.
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