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Jiang Q, Wu KLK, Hu XQ, Cheung MH, Chen W, Ma CW, Shum DKY, Chan YS. Neonatal GABAergic transmission primes vestibular gating of output for adult spatial navigation. Cell Mol Life Sci 2024; 81:147. [PMID: 38502309 PMCID: PMC10951018 DOI: 10.1007/s00018-024-05170-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 01/26/2024] [Accepted: 02/07/2024] [Indexed: 03/21/2024]
Abstract
GABAergic interneurons are poised with the capacity to shape circuit output via inhibitory gating. How early in the development of medial vestibular nucleus (MVN) are GABAergic neurons recruited for feedforward shaping of outputs to higher centers for spatial navigation? The role of early GABAergic transmission in assembling vestibular circuits for spatial navigation was explored by neonatal perturbation. Immunohistochemistry and confocal imaging were utilized to reveal the expression of parvalbumin (PV)-expressing MVN neurons and their perineuronal nets. Whole-cell patch-clamp recording, coupled with optogenetics, was conducted in vitro to examine the synaptic function of MVN circuitry. Chemogenetic targeting strategy was also employed in vivo to manipulate neuronal activity during navigational tests. We found in rats a neonatal critical period before postnatal day (P) 8 in which competitive antagonization of GABAergic transmission in the MVN retarded maturation of inhibitory neurotransmission, as evidenced by deranged developmental trajectory for excitation/inhibition ratio and an extended period of critical period-like plasticity in GABAergic transmission. Despite increased number of PV-expressing GABAergic interneurons in the MVN, optogenetic-coupled patch-clamp recording indicated null-recruitment of these neurons in tuning outputs along the ascending vestibular pathway. Such perturbation not only offset output dynamics of ascending MVN output neurons, but was further accompanied by impaired vestibular-dependent navigation in adulthood. The same perturbations were however non-consequential when applied after P8. Results highlight neonatal GABAergic transmission as key to establishing feedforward output dynamics to higher brain centers for spatial cognition and navigation.
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Affiliation(s)
- Qiufen Jiang
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
- MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Xiao-Qian Hu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
- Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Man-Him Cheung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
| | - Wenqiang Chen
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
- Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA
| | - Chun-Wai Ma
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China
| | - Daisy Kwok-Yan Shum
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China.
- State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, Hong Kong SAR, People's Republic of China.
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong, Hong Kong SAR, People's Republic of China.
- State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, Hong Kong SAR, People's Republic of China.
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Liu JA, Tam KW, Chen YL, Feng X, Chan CWL, Lo ALH, Wu KLK, Hui MN, Wu MH, Chan KKK, Cheung MPL, Cheung CW, Shum DKY, Chan YS, Cheung M. Transplanting Human Neural Stem Cells with ≈50% Reduction of SOX9 Gene Dosage Promotes Tissue Repair and Functional Recovery from Severe Spinal Cord Injury. Adv Sci (Weinh) 2023:e2205804. [PMID: 37296073 PMCID: PMC10369238 DOI: 10.1002/advs.202205804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 04/30/2023] [Indexed: 06/12/2023]
Abstract
Neural stem cells (NSCs) derived from human pluripotent stem cells (hPSCs) are considered a major cell source for reconstructing damaged neural circuitry and enabling axonal regeneration. However, the microenvironment at the site of spinal cord injury (SCI) and inadequate intrinsic factors limit the therapeutic potential of transplanted NSCs. Here, it is shown that half dose of SOX9 in hPSCs-derived NSCs (hNSCs) results in robust neuronal differentiation bias toward motor neuron lineage. The enhanced neurogenic potency is partly attributed to the reduction of glycolysis. These neurogenic and metabolic properties retain after transplantation of hNSCs with reduced SOX9 expression in a contusive SCI rat model without the need for growth factor-enriched matrices. Importantly, the grafts exhibit excellent integration properties, predominantly differentiate into motor neurons, reduce glial scar matrix accumulation to facilitate long-distance axon growth and neuronal connectivity with the host as well as dramatically improve locomotor and somatosensory function in recipient animals. These results demonstrate that hNSCs with half SOX9 gene dosage can overcome extrinsic and intrinsic barriers, representing a powerful therapeutic potential for transplantation treatments for SCI.
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Affiliation(s)
- Jessica Aijia Liu
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- Department of Neuroscience, Tat Chee Avenue, City University of Hong Kong, Hong Kong, China
| | - Kin Wai Tam
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Yong Long Chen
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Xianglan Feng
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Christy Wing Lam Chan
- Department of Neuroscience, Tat Chee Avenue, City University of Hong Kong, Hong Kong, China
| | - Amos Lok Hang Lo
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Man-Ning Hui
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Ming-Hoi Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Ken Kwok-Keung Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - May Pui Lai Cheung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Chi Wai Cheung
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Daisy Kwok-Yan Shum
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Martin Cheung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
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Tam KW, Wong CY, Wu KLK, Lam G, Liang X, Wong WT, Li MTS, Liu WY, Cai S, Shea GKH, Shum DKY, Chan YS. IPSC-Derived Sensory Neurons Directing Fate Commitment of Human BMSC-Derived Schwann Cells: Applications in Traumatic Neural Injuries. Cells 2023; 12:1479. [PMID: 37296600 PMCID: PMC10253081 DOI: 10.3390/cells12111479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/16/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
The in vitro derivation of Schwann cells from human bone marrow stromal cells (hBMSCs) opens avenues for autologous transplantation to achieve remyelination therapy for post-traumatic neural regeneration. Towards this end, we exploited human induced pluripotent stem-cell-derived sensory neurons to direct Schwann-cell-like cells derived from among the hBMSC-neurosphere cells into lineage-committed Schwann cells (hBMSC-dSCs). These cells were seeded into synthetic conduits for bridging critical gaps in a rat model of sciatic nerve injury. With improvement in gait by 12-week post-bridging, evoked signals were also detectable across the bridged nerve. Confocal microscopy revealed axially aligned axons in association with MBP-positive myelin layers across the bridge in contrast to null in non-seeded controls. Myelinating hBMSC-dSCs within the conduit were positive for both MBP and human nucleus marker HuN. We then implanted hBMSC-dSCs into the contused thoracic cord of rats. By 12-week post-implantation, significant improvement in hindlimb motor function was detectable if chondroitinase ABC was co-delivered to the injured site; such cord segments showed axons myelinated by hBMSC-dSCs. Results support translation into a protocol by which lineage-committed hBMSC-dSCs become available for motor function recovery after traumatic injury to both peripheral and central nervous systems.
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Affiliation(s)
- Kin-Wai Tam
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Cheuk-Yin Wong
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Guy Lam
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Xiaotong Liang
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Wai-Ting Wong
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Maximilian Tak-Sui Li
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Wing-Yui Liu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Sa Cai
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
| | - Graham Ka-Hon Shea
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China;
| | - Daisy Kwok-Yan Shum
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
- State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, China
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China; (K.-W.T.); (C.-Y.W.); (K.L.-K.W.); (G.L.); (X.L.); (W.-T.W.); (M.T.-S.L.); (W.-Y.L.); (S.C.)
- State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, China
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Zhang AJ, Lee ACY, Chu H, Chan JFW, Fan Z, Li C, Liu F, Chen Y, Yuan S, Poon VKM, Chan CCS, Cai JP, Wu KLK, Sridhar S, Chan YS, Yuen KY. Severe Acute Respiratory Syndrome Coronavirus 2 Infects and Damages the Mature and Immature Olfactory Sensory Neurons of Hamsters. Clin Infect Dis 2021; 73:e503-e512. [PMID: 32667973 PMCID: PMC7454453 DOI: 10.1093/cid/ciaa995] [Citation(s) in RCA: 82] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 07/13/2020] [Indexed: 01/08/2023] Open
Abstract
Background Coronavirus Disease 2019 (COVID-19) is primarily an acute respiratory tract infection. Distinctively, a substantial proportion of COVID-19 patients develop olfactory dysfunction of uncertain underlying mechanism which can be severe and prolonged. The roles of inflammatory obstruction of the olfactory clefts leading to conductive impairment, inflammatory cytokines affecting olfactory neuronal function, destruction of olfactory neurons or their supporting cells, and direct invasion of olfactory bulbs, in causing olfactory dysfunction are uncertain. Methods In this study, we investigated the location for the pathogenesis of SARS-CoV-2 from the olfactory epithelium (OE) of the nasopharynx to the olfactory bulb of golden Syrian hamsters. Results After intranasal inoculation with SARS-CoV-2, inflammatory cell infiltration and proinflammatory cytokine/chemokine responses were detected in the nasal turbinate tissues which peaked between 2 to 4 days post-infection with the highest viral load detected at day 2 post-infection. Besides the nasopharyngeal pseudo-columnar ciliated respiratory epithelial cells, SARS-CoV-2 viral antigens were also detected in the more superficial mature olfactory sensory neurons labeled by olfactory marker protein (OMP), the less mature olfactory neurons labelled by Tuj1 at more basal position, and the sustentacular cells which provide metabolic and physical support for the olfactory neurons, resulting in apoptosis and severe destruction of the OE. During the whole course of infection, SARS-CoV-2 viral antigens were not detected in the olfactory bulb. Conclusions Besides acute inflammation at OE, infection of mature and immature olfactory neurons, and the supporting sustentacular cells by SARS-CoV-2 may contribute to the unique olfactory dysfunction of COVID-19 which is not reported with SARS-CoV.
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Affiliation(s)
- Anna Jinxia Zhang
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Andrew Chak-Yiu Lee
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Hin Chu
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Jasper Fuk-Woo Chan
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Queen Mary Hospital, Pokfulam, Hong Kong Special Administrative Region, China
| | - Zhimeng Fan
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Can Li
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Feifei Liu
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Yanxia Chen
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Shuofeng Yuan
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Vincent Kwok-Man Poon
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Chris Chung-Sing Chan
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Jian-Piao Cai
- Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong Special Administrative Region, China.,State Key Laboratory of Brain and Cognitive Sciences, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Siddharth Sridhar
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Queen Mary Hospital, Pokfulam, Hong Kong Special Administrative Region, China
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong Special Administrative Region, China.,State Key Laboratory of Brain and Cognitive Sciences, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Kwok-Yung Yuen
- State Key Laboratory of Emerging Infectious Diseases, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Carol Yu Centre for Infection, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.,Department of Microbiology, Queen Mary Hospital, Pokfulam, Hong Kong Special Administrative Region, China
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Ma CW, Wu KLK, Chan YS. Vision on the internationalization of physiology education: Trends and prospects. Sheng Li Xue Bao 2020; 72:690-698. [PMID: 33349825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Rapid advancement of physiology education has occurred since the twentieth century due to the emergence of new pedagogies and collaborative effort of physiologists worldwide. Physiological organizations and institutions contribute to the teaching of physiology through international congresses, education symposia, teaching workshops, exchange programs, and journal publications. The Internet and information technologies play a crucial role in the promotion and improvement of computer-based physiology education across different countries. Interactive teaching practices and problem-based learning have also become globally applied strategies to enhance students' motivation and facilitate learning effectiveness. In this article, we review the global development and implementation of pedagogical approaches to the teaching of physiology, as well as the emerging trends and practices for physiology education in the future.
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Affiliation(s)
- Chun-Wai Ma
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, China.
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, China
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, China.
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Han L, Wu KLK, Kwan PY, Chua OWH, Shum DKY, Chan YS. 5-HT 1A receptor-mediated attenuation of synaptic transmission in rat medial vestibular nucleus impacts on vestibular-related motor function. J Physiol 2020; 599:253-267. [PMID: 33006159 DOI: 10.1113/jp280610] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 09/29/2020] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Chemogenetic activation of medial vestibular nucleus-projecting 5-HT neurons resulted in deficits in vestibular-mediated tasks, including negative geotaxis, balance beam and rota-rod tests. The 5-HT1A receptor mediates the vestibular-related behavioural effects of 5-HT in the vestibular nucleus. 5-HT1A receptor activation attenuated evoked excitatory postsynaptic currents and evoked inhibitory postsynaptic currents via a presynaptic mechanism in the vestibular nucleus. ABSTRACT While the anxiolytic effects of serotonergic neuromodulation are well studied, its role in sensorimotor coordination and postural control is unclear. In this study, we show that an increase of serotonin (5-hydroxytryptamine, 5-HT) at the medial vestibular nucleus (MVN), a brainstem centre for vestibulospinal coordination, by either direct cannula administration or chemogenetic stimulation of MVN-projecting serotonergic neurons, adversely affected performance of rats in vestibular-mediated tasks, including negative geotaxis, balance beam and rota-rod tests. Application of the 5-HT1 and 5-HT7 receptor co-agonist 8-hydroxy-2-(di-n-propylamino) tetralin recapitulated the effect of 5-HT, while co-administration of the specific 5-HT1A receptor antagonist WAY 100135 effectively abolished all 5-HT-induced behavioural deficits. This indicated that 5-HT1A receptors mediated the effects of 5-HT in the rat MVN. Using whole-cell patch-clamp recording, we demonstrated that 5-HT1A receptor activation attenuated both evoked excitatory and evoked inhibitory postsynaptic currents through a presynaptic mechanism in the rat MVN. The results thus highlight the 5-HT1A receptor as the gain controller of vestibular-related brainstem circuits for posture and balance.
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Affiliation(s)
- Lei Han
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
| | - Pui-Yi Kwan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
| | - Oscar Wing-Ho Chua
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
| | - Daisy Kwok-Yan Shum
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China.,State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, Hong Kong, PR China
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China.,State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, Hong Kong, PR China
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Shea GKH, Wu KLK, Li IWS, Leung MF, Ko ALP, Tse L, Pang SSY, Kwan KYH, Wong TM, Leung FKL, Fang CX. A review of the manufacturing process and infection rate of 3D-printed models and guides sterilized by hydrogen peroxide plasma and utilized intra-operatively. 3D Print Med 2020; 6:7. [PMID: 32232596 PMCID: PMC7106677 DOI: 10.1186/s41205-020-00061-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 03/10/2020] [Indexed: 01/08/2023] Open
Abstract
3D printing in the context of medical application can allow for visualization of patient-specific anatomy to facilitate surgical planning and execution. Intra-operative usage of models and guides allows for real time feedback but ensuring sterility is essential to prevent infection. The additive manufacturing process restricts options for sterilisation owing to temperature sensitivity of thermoplastics utilised for fabrication. Here, we review one of the largest single cohorts of 3D models and guides constructed from Acrylonitrile butadiene styrene (ABS) and utilized intra-operatively, following terminal sterilization with hydrogen peroxide plasma. We describe our work flow from initial software rendering to printing, sterilization, and on-table application with the objective of demonstrating that our process is safe and can be implemented elsewhere. Overall, 7% (8/114 patients) of patients developed a surgical site infection, which was not elevated in comparison to related studies utilizing traditional surgical methods. Prolonged operation time with an associated increase in surgical complexity was identified to be a risk factor for infection. Low temperature plasma-based sterilization depends upon sufficient permeation and contact with surfaces which are a particular challenge when our 3D-printouts contain diffusion-restricted luminal spaces as well as hollows. Application of printouts as guides for power tools may further expose these regions to sterile bodily tissues and result in generation of debris. With each printout being a bespoke medical device, it is important that the multidisciplinary team involved in production and application understand potential pitfalls to ensuring sterility as to minimize infection risk.
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Affiliation(s)
- Graham Ka-Hon Shea
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong.
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, Hong Kong
| | - Iris Wai-Sum Li
- School of Public Health, The University of Hong Kong, Hong Kong, Hong Kong
| | - Man-Fai Leung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Ada Lai-Ping Ko
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Lane Tse
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | | | - Kenny Yat-Hong Kwan
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Tak-Man Wong
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Frankie Ka-Li Leung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong
| | - Christian Xinshuo Fang
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, Hong Kong.,Tam Shiu Foundation Anatomical Modelling Laboratory, Hong Kong, Hong Kong
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Ma CW, Kwan PY, Wu KLK, Shum DKY, Chan YS. Regulatory roles of perineuronal nets and semaphorin 3A in the postnatal maturation of the central vestibular circuitry for graviceptive reflex. Brain Struct Funct 2018; 224:613-626. [PMID: 30460552 DOI: 10.1007/s00429-018-1795-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 11/12/2018] [Indexed: 10/27/2022]
Abstract
Perineuronal nets (PN) restrict neuronal plasticity in the adult brain. We hypothesize that activity-dependent consolidation of PN is required for functional maturation of behavioral circuits. Using the postnatal maturation of brainstem vestibular nucleus (VN) circuits as a model system, we report a neonatal period in which consolidation of central vestibular circuitry for graviception is accompanied by activity-dependent consolidation of chondroitin sulfate (CS)-rich PN around GABAergic neurons in the VN. Postnatal onset of negative geotaxis was used as an indicator for functional maturation of vestibular circuits. Rats display negative geotaxis from postnatal day (P) 9, coinciding with the condensation of CS-rich PN around GABAergic interneurons in the VN. Delaying PN formation, by removal of primordial CS moieties on VN with chondroitinase ABC (ChABC) treatment at P6, postponed emergence of negative geotaxis to P13. Similar postponement was observed following inhibition of GABAergic transmission with bicuculline, in line with the reported role of PN in increasing excitability of parvalbumin neurons. We further reasoned that PN-CS restricts bioavailability of plasticity-inducing factors such as semaphorin 3A (Sema3A) to bring about circuit maturation. Treatment of VN explants with ChABC to liberate PN-bound Sema3A resulted in dendritic growth and arborization, implicating structural plasticity that delays synapse formation. Evidence is thus provided for the role of PN-CS-Sema3A in regulating structural and circuit plasticity at VN interneurons with impacts on the development of graviceptive postural control.
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Affiliation(s)
- Chun-Wai Ma
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China
| | - Pui-Yi Kwan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China
| | - Kenneth Lap-Kei Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China
| | - Daisy Kwok-Yan Shum
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China. .,State Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China.
| | - Ying-Shing Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China. .,State Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, People's Republic of China.
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