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Kohmura Y, Yang SM, Chen HH, Takano H, Chang CJ, Wang YS, Lee TT, Chiu CY, Yang KE, Chien YT, Hu HM, Su TL, Petibois C, Chen YY, Hsu CH, Chen P, Hueng DY, Chen SJ, Yang CL, Chin AL, Low CM, Tan FCK, Teo A, Tok ES, Cai XX, Lin HM, Boeckl J, Stampfl AP, Yamada J, Matsuyama S, Ishikawa T, Margaritondo G, Chiang AS, Hwu Y. The new X-ray/visible microscopy MAXWELL technique for fast three-dimensional nanoimaging with isotropic resolution. Sci Rep 2022; 12:9668. [PMID: 35690597 PMCID: PMC9188605 DOI: 10.1038/s41598-022-13377-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 05/05/2022] [Indexed: 11/09/2022] Open
Abstract
Microscopy by Achromatic X-rays With Emission of Laminar Light (MAXWELL) is a new X-ray/visible technique with attractive characteristics including isotropic resolution in all directions, large-volume imaging and high throughput. An ultrathin, laminar X-ray beam produced by a Wolter type I mirror irradiates the sample stimulating the emission of visible light by scintillating nanoparticles, captured by an optical system. Three-dimensional (3D) images are obtained by scanning the specimen with respect to the laminar beam. We implemented and tested the technique with a high-brightness undulator at SPring-8, demonstrating its validity for a variety of specimens. This work was performed under the Synchrotrons for Neuroscience-an Asia-Pacific Strategic Enterprise (SYNAPSE) collaboration.
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Affiliation(s)
| | - Shun-Min Yang
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Hsiang-Hsin Chen
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | | | - Chia-Ju Chang
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Ya-Sian Wang
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Tsung-Tse Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Ching-Yu Chiu
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Kai-En Yang
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Yu-Ting Chien
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Huan-Ming Hu
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Tzu-Ling Su
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Cyril Petibois
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Yi-Yun Chen
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Cheng-Huan Hsu
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan
| | - Peilin Chen
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan.,Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Dueng-Yuan Hueng
- Department of Surgery, School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Shean-Jen Chen
- College of Photonics, National Yang Ming Chiao Tung University, Tainan, Taiwan
| | - Chi Lin Yang
- Brain Research Center, National Tsing Hua University, Hsinchu, Taiwan
| | - An-Lun Chin
- Brain Research Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Chian-Ming Low
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Francis Chee Kuan Tan
- Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Alvin Teo
- School of Chemical and Life Sciences, Nanyang Polytechnic, Singapore, Singapore
| | - Eng Soon Tok
- ƐMaGIC-Lab, Department of Physics, National University of Singapore, Singapore, Singapore
| | - Xu Xiang Cai
- Mechanical and Materials Department, Tatung University, Taipei, Taiwan
| | - Hong-Ming Lin
- Mechanical and Materials Department, Tatung University, Taipei, Taiwan
| | - John Boeckl
- US Air Force Research Laboratory, Materials and Manufacturing Directorate, WPAFB, Fairborn, OH, 43455, USA
| | - Anton P Stampfl
- Australian Nuclear Science and Technology Organisation, Sydney, NSW, 2234, Australia
| | | | - Satoshi Matsuyama
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan
| | | | | | - Ann-Shyn Chiang
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan.,Brain Research Center, National Tsing Hua University, Hsinchu, Taiwan
| | - Yeukuang Hwu
- Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan. .,Brain Research Center, National Tsing Hua University, Hsinchu, Taiwan.
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Chen HH, Yang SM, Yang KE, Chiu CY, Chang CJ, Wang YS, Lee TT, Huang YF, Chen YY, Petibois C, Chang SH, Cai X, Low CM, Tan FCK, Teo A, Tok ES, Lim JH, Je JH, Kohmura Y, Ishikawa T, Margaritondo G, Hwu Y. High-resolution fast-tomography brain-imaging beamline at the Taiwan Photon Source. J Synchrotron Radiat 2021; 28:1662-1668. [PMID: 34475313 DOI: 10.1107/s1600577521007633] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
The new Brain Imaging Beamline (BIB) of the Taiwan Photon Source (TPS) has been commissioned and opened to users. The BIB and in particular its endstation are designed to take advantage of bright unmonochromatized synchrotron X-rays and target fast 3D imaging, ∼1 ms exposure time plus very high ∼0.3 µm spatial resolution. A critical step in achieving the planned performances was the solution to the X-ray induced damaging problems of the detection system. High-energy photons were identified as their principal cause and were solved by combining tailored filters/attenuators and a high-energy cut-off mirror. This enabled the tomography acquisition throughput to reach >1 mm3 min-1, a critical performance for large-animal brain mapping and a vital mission of the beamline.
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Affiliation(s)
- Hsiang Hsin Chen
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Shun Min Yang
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Kai En Yang
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Ching Yu Chiu
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Chia Ju Chang
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Ya Sian Wang
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Tsung Tse Lee
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Yu Fen Huang
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Yi Yun Chen
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Cyril Petibois
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
| | - Shih Hung Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Xiaoqing Cai
- Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, People's Republic of China
| | - Chian Ming Low
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Francis Chee Kuan Tan
- Department of Anaesthesia, National University Hospital, National University Health System, Singapore
| | - Alvin Teo
- School of Chemical and Life Sciences, Nanyang Polytechnic, Singapore
| | - Eng Soon Tok
- eMaGIC-Lab, Department of Physics, National University of Singapore, Singapore
| | - Jae Hong Lim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Jun Ho Je
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | | | | | - Giorgio Margaritondo
- Faculté des Sciences de Base, Ecole Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
| | - Yeukuang Hwu
- Institute of Physics, Academia Sinica, 128 Academia Road Sec. 2, Taipei 11529, Taiwan
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3
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Liu W, Li C, Tan FCK, Neo HJ, Chan YH, Low CM, Lee TL. Cerebrospinal fluid of chronic osteoarthritic patients induced interleukin-6 release in human glial cell-line T98G. BMC Anesthesiol 2020; 20:69. [PMID: 32213162 PMCID: PMC7093964 DOI: 10.1186/s12871-020-00985-0] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 03/18/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Chronic osteoarthritic pain is not well understood in terms of its pathophysiological mechanism. Activated glial cells are thought to play a role in the maintenance of chronic pain. T98G glioblastoma cell line was previously observed to release higher amounts of interleukin-6 (IL-6) when treated with cerebrospinal fluid (CSF) from patients with another chronic pain condition, post-herpetic neuralgia. In this study, we investigated the ability of CSF from patients diagnosed with knee osteoarthritis suffering from chronic pain, to trigger the release of pro-inflammatory cytokines, IL-6, IL-1beta and tumour necrosis factor alpha (TNF-α) from T98G. Characterization of upstream signalling was also explored. METHODS Fifteen osteoarthritis patients undergoing total knee replacement due to chronic knee pain and 15 patients without pain undergoing other surgeries with spinal anaesthesia were prospectively recruited. CSF was collected during anaesthesia. CSF were added to cultured T98G cells in the presence of lipopolysaccharide. IL-6, IL-1β and TNF-α release from T98G cells were measured using enzyme immunoassay. Antibody array and western blotting were performed using CSF-triggered T98G cell lysates to identify possible signalling targets. Age, gender and pain scores were recorded. Mann-Whitney U test was used to compare IL-6 release and protein expression between groups. Association between IL-6 and pain score was analysed using linear regression. RESULTS Significant higher levels of IL-6 were released by T98G cells when induced by osteoarthritis patients' CSF in the presence of LPS. The IL-6 levels showed positive association with pain score (adjusted B estimate = 10.1 (95% Confidence Interval 4.3-15.9); p = 0.001). Antibody array conducted with 6 pooled T98G cell lysate induced with osteoarthritis pain patient CSF identified greater than 2-fold proteins including STE20-related kinase adaptor protein and spleen tyrosine kinase. Further validation done using western blotting of individual CSF-triggered T98G cell lysate showed non-significant increase. CONCLUSION Higher IL-6 release from T98G when triggered by OA-CSF, in the presence of LPS, suggest the presence of "unknown molecule" in CSF that may be crucial in the maintenance phase of chronic pain in our osteoarthritis population. Further studies on the signalling pathways involved in pain and relevance of IL-6 release from T98G cells in other pain models are needed.
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Affiliation(s)
- Weiling Liu
- Department of Anaesthesia, National University Hospital, National University Health System, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Chunmei Li
- Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Francis Chee Kuan Tan
- Department of Anaesthesia, National University Hospital, National University Health System, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Hong Jye Neo
- Department of Anaesthesia, National University Hospital, National University Health System, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Yiong Huak Chan
- Biostatistics Unit, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Chian-Ming Low
- Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore.,Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 16 Medical Drive, Singapore, 117600, Singapore
| | - Tat Leang Lee
- Department of Anaesthesia, National University Hospital, National University Health System, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore. .,Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore.
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4
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Abstract
Rapid advances in sequencing technology have led to an explosive increase in the number of genetic variants identified in patients with neurological disease and have also enabled the assembly of a robust database of variants in healthy individuals. A surprising number of variants in the GRIN genes that encode N-methyl-D-aspartate (NMDA) glutamatergic receptor subunits have been found in patients with various neuropsychiatric disorders, including autism spectrum disorders, epilepsy, intellectual disability, attention-deficit/hyperactivity disorder, and schizophrenia. This review compares and contrasts the available information describing the clinical and functional consequences of genetic variations in GRIN2A and GRIN2B. Comparison of clinical phenotypes shows that GRIN2A variants are commonly associated with an epileptic phenotype but that GRIN2B variants are commonly found in patients with neurodevelopmental disorders. These observations emphasize the distinct roles that the gene products serve in circuit function and suggest that functional analysis of GRIN2A and GRIN2B variation may provide insight into the molecular mechanisms, which will allow more accurate subclassification of clinical phenotypes. Furthermore, characterization of the pharmacological properties of variant receptors could provide the first opportunity for translational therapeutic strategies for these GRIN-related neurological and psychiatric disorders.
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Affiliation(s)
- Scott J Myers
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University, Atlanta, GA, USA
- Department of Pharmacology and Chemical Biology, Emory University, Atlanta, GA, USA
| | - Hongjie Yuan
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University, Atlanta, GA, USA
- Department of Pharmacology and Chemical Biology, Emory University, Atlanta, GA, USA
| | - Jing-Qiong Kang
- Department of Neurology, Vanderbilt Brain Institute, Vanderbilt Kennedy Center of Human Development, Vanderbilt University, Nashville, TN, USA
| | - Francis Chee Kuan Tan
- Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Stephen F Traynelis
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University, Atlanta, GA, USA
- Department of Pharmacology and Chemical Biology, Emory University, Atlanta, GA, USA
| | - Chian-Ming Low
- Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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5
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Abstract
Functionalization on the alkyl tail of arachidonyl trifluoromethylketone leads to the development of fluorogenic inhibitor and substrate probes of cPLA2.
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Affiliation(s)
- Cheng Yang Ng
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | | | - Francis Chee Kuan Tan
- Department of Anaesthesia
- Yong Loo Lin School of Medicine
- National University of Singapore
- Singapore 119074
- Singapore
| | - Chian-Ming Low
- Department of Anaesthesia
- Yong Loo Lin School of Medicine
- National University of Singapore
- Singapore 119074
- Singapore
| | - Yulin Lam
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
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Jayakody T, Marwari S, Lakshminarayanan R, Tan FCK, Johannes CW, Dymock BW, Poulsen A, Herr DR, Dawe GS. Hydrocarbon stapled B chain analogues of relaxin-3 retain biological activity. Peptides 2016; 84:44-57. [PMID: 27498038 DOI: 10.1016/j.peptides.2016.08.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 07/29/2016] [Accepted: 08/02/2016] [Indexed: 11/30/2022]
Abstract
Relaxin-3 or insulin-like peptide 7 (INSL7) is the most recently discovered relaxin/insulin-like family peptide. Mature relaxin-3 consists of an A chain and a B chain held by disulphide bonds. According to structure activity relationship studies, the relaxin-3 B chain is more important in binding and activating the receptor. RXFP3 (also known as Relaxin-3 receptor 1, GPCR 135, somatostatin- and angiotensin- like peptide receptor or SALPR) was identified as the cognate receptor for relaxin-3 by expression profiles and binding studies. Recent studies imply roles of this system in mediating stress and anxiety, feeding, metabolism and cognition. Stapling of peptides is a technique used to develop peptide drugs for otherwise undruggable targets. The main advantages of stapling include, increased activity due to reduced proteolysis, increased affinity to receptors and increased cell permeability. Stable agonists and antagonists of RXFP3 are crucial for understanding the physiological significance of this system. So far, agonists and antagonists of RXFP3 are peptides. In this study, for the first time, we have introduced stapling of the relaxin-3 B chain at 14th and 18th positions (14s18) and 18th and 22nd position (18s22). These stapled peptides showed greater helicity than the unstapled relaxin-3 B chain in circular dichroism analysis. Both stapled peptides bound RXFP3 and activated RXFP3 as observed in an inhibition of forskolin-induced cAMP assay and a ERK1/2 activation assay, although with different potencies. Therefore, we conclude that stapling of the relaxin3 B chain does not compromise its ability to activate RXFP3 and is a promising method for developing stable peptide agonists and antagonists of RXFP3 to aid relaxin-3/RXFP3 research.
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Affiliation(s)
- Tharindunee Jayakody
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, Singapore; Singapore Institute for Neurotechnology (SINAPSE), National University of Singapore, Singapore
| | - Subhi Marwari
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore
| | - Rajamani Lakshminarayanan
- Singapore Eye Research Institute, Singapore; Ophthalmology and Visual Sciences Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Francis Chee Kuan Tan
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Charles William Johannes
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Brian William Dymock
- Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore
| | - Anders Poulsen
- Department of Medicinal Chemistry, Experimental Therapeutics Centre, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Deron Raymond Herr
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Gavin Stewart Dawe
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, Singapore; Singapore Institute for Neurotechnology (SINAPSE), National University of Singapore, Singapore.
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7
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Wee KSL, Tan FCK, Cheong YP, Khanna S, Low CM. Ontogenic Profile and Synaptic Distribution of GluN3 Proteins in the Rat Brain and Hippocampal Neurons. Neurochem Res 2015; 41:290-7. [DOI: 10.1007/s11064-015-1794-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 11/27/2015] [Accepted: 11/28/2015] [Indexed: 12/01/2022]
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Kumar JR, Rajkumar R, Farooq U, Lee LC, Tan FCK, Dawe GS. Evidence of D2 receptor expression in the nucleus incertus of the rat. Physiol Behav 2015; 151:525-34. [PMID: 26300469 DOI: 10.1016/j.physbeh.2015.08.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 07/27/2015] [Accepted: 08/17/2015] [Indexed: 01/11/2023]
Abstract
The nucleus incertus (NI), located in the caudal brainstem, mainly consists of GABAergic neurons with widespread projections across the brain. It is the chief source of relaxin-3 in the mammalian brain and densely expresses corticotropin-releasing factor type 1 (CRF1) receptors. Several other neurotransmitters, peptides and receptors are reportedly expressed in the NI. In the present investigation, we show the expression of dopamine type-2 (D2) receptors in the NI by reverse transcriptase-polymerase chain reaction (RT-PCR), western blotting (WB) and immunofluorescence (IF). RT-PCR did not show expression of D3 receptors. D2 receptor short isoform (D2S)-like, relaxin-3, CRF1/2 receptor and NeuN immunoreactivity were co-expressed in the cells of the NI. Behavioural effects of D2 receptor activation by intra-NI infusion of quinpirole (a D2/D3 agonist) were evaluated. Hypolocomotion was observed in home cage monitoring system (LABORAS) and novel environment-induced suppression of feeding behavioural paradigms. Thus the D2 receptors expressed in the NI are likely to play a role in locomotion. Based on its strong bidirectional connections to the median raphe and interpeduncular nuclei, the NI was predicted to play a role in modulating behavioural activity and the present results lend support to this hypothesis. This is the first evidence of expression of a catecholamine receptor, D2-like immunoreactivity, in the NI.
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Affiliation(s)
- Jigna Rajesh Kumar
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| | - Ramamoorthy Rajkumar
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore
| | - Usman Farooq
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore
| | - Liying Corinne Lee
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore
| | - Francis Chee Kuan Tan
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore
| | - Gavin S Dawe
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore; Neurobiology and Ageing Programme, Life Sciences Institute, National University of Singapore, 117456, Singapore; Singapore Institute for Neurotechnology (SINAPSE), 117456, Singapore; NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore.
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9
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Chia WJ, Tan FCK, Ong WY, Dawe GS. Expression and localisation of brain-type organic cation transporter (BOCT/24p3R/LCN2R) in the normal rat hippocampus and after kainate-induced excitotoxicity. Neurochem Int 2015; 87:43-59. [PMID: 26004810 DOI: 10.1016/j.neuint.2015.04.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 03/18/2014] [Revised: 04/06/2015] [Accepted: 04/14/2015] [Indexed: 01/13/2023]
Abstract
The iron siderophore binding protein lipocalin 2 (LCN2, also known as 24p3, NGAL and siderocalin) may be involved in iron homeostasis, but to date, little is known about expression of its putative receptor, brain-type organic cation transporter (BOCT, also known as BOCT1, 24p3R, NGALR and LCN2R), in the brain during neurodegeneration. The present study was carried out to elucidate the expression of LCN2 and BOCT in hippocampus after excitotoxicity induced by the glutamate analog, kainate (KA) and a possible role of LCN2 in neuronal injury. As reported previously, a rapid and sustained induction in expression of LCN2 was found in the hippocampus after intracerebroventicular injection of KA. BOCT was expressed in neurons of the saline-injected control hippocampus, and immunolabel for BOCT protein was preserved in pyramidal neurons of CA1 at 1 day post-KA injection, likely due to the delayed onset of neurodegeneration after KA injection. At 3 days and 2 weeks after KA injections, loss of immunolabel was observed due to degenerated neurons, although remaining neurons continued to express BOCT, and induction of BOCT was found in OX-42 positive microglia. This resulted in an overall decrease in BOCT mRNA and protein expression after KA treatment. Increased expression of the pro-apoptotic marker, Bim, was found in both neurons and microglia after KA injection, but TUNEL staining indicating apoptosis was found primarily in Bim-expressing neurons, but not microglia. Interaction between LCN2 and BOCT was found by DuoLink assay in cultured hippocampal neurons. Apo-LCN2 without iron caused no significant differences in neuronal Bim expression or cell survival, whereas holo-LCN2 consisting of LCN2:iron:enterochelin complex increased Bim mRNA expression and decreased neuronal survival. Together, results suggest that LCN2 and BOCT may have a role in neuronal injury.
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Affiliation(s)
- Wan-Jie Chia
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 10 Medical Drive, Singapore 117597; National University of Singapore Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456; Neurobiology and Ageing Programme, Life Sciences Institute, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456
| | - Francis Chee Kuan Tan
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 10 Medical Drive, Singapore 117597; Neurobiology and Ageing Programme, Life Sciences Institute, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456; Singapore Institute for Neurotechnology (SINAPSE), Centre for Life Sciences, 28 Medical Drive, Singapore 117456
| | - Wei-Yi Ong
- Neurobiology and Ageing Programme, Life Sciences Institute, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456; Department of Anatomy, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 4 Medical Drive, Singapore 117597.
| | - Gavin S Dawe
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, 10 Medical Drive, Singapore 117597; National University of Singapore Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456; Neurobiology and Ageing Programme, Life Sciences Institute, Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456; Singapore Institute for Neurotechnology (SINAPSE), Centre for Life Sciences, 28 Medical Drive, Singapore 117456.
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10
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Liu C, Tan FCK, Xiao ZC, Dawe GS. Amyloid precursor protein enhances Nav1.6 sodium channel cell surface expression. J Biol Chem 2015; 290:12048-57. [PMID: 25767117 DOI: 10.1074/jbc.m114.617092] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 10/13/2014] [Indexed: 12/19/2022] Open
Abstract
Amyloid precursor protein (APP) is commonly associated with Alzheimer disease, but its physiological function remains unknown. Nav1.6 is a key determinant of neuronal excitability in vivo. Because mouse models of gain of function and loss of function of APP and Nav1.6 share some similar phenotypes, we hypothesized that APP might be a candidate molecule for sodium channel modulation. Here we report that APP colocalized and interacted with Nav1.6 in mouse cortical neurons. Knocking down APP decreased Nav1.6 sodium channel currents and cell surface expression. APP-induced increases in Nav1.6 cell surface expression were Go protein-dependent, enhanced by a constitutively active Go protein mutant, and blocked by a dominant negative Go protein mutant. APP also regulated JNK activity in a Go protein-dependent manner. JNK inhibition attenuated increases in cell surface expression of Nav1.6 sodium channels induced by overexpression of APP. JNK, in turn, phosphorylated APP. Nav1.6 sodium channel surface expression was increased by T668E and decreased by T668A, mutations of APP695 mimicking and preventing Thr-668 phosphorylation, respectively. Phosphorylation of APP695 at Thr-668 enhanced its interaction with Nav1.6. Therefore, we show that APP enhances Nav1.6 sodium channel cell surface expression through a Go-coupled JNK pathway.
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Affiliation(s)
- Chao Liu
- From the Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 10 Medical Drive, Singapore 117597, the Neurobiology and Ageing Programme, Life Sciences Institute and Singapore Institute for Neurotechnology (SINAPSE), Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456
| | - Francis Chee Kuan Tan
- From the Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 10 Medical Drive, Singapore 117597, the Neurobiology and Ageing Programme, Life Sciences Institute and Singapore Institute for Neurotechnology (SINAPSE), Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456
| | - Zhi-Cheng Xiao
- the Key Laboratory of Stem Cell and Regenerative Medicine, Institute of Molecular and Clinical Medicine, Kunming Medical College, Kunming 650031, China, and the Shunxi-Monash Immune Regeneration and Neuroscience Laboratories, Department of Anatomy and Developmental Biology, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - Gavin S Dawe
- From the Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 10 Medical Drive, Singapore 117597, the Neurobiology and Ageing Programme, Life Sciences Institute and Singapore Institute for Neurotechnology (SINAPSE), Centre for Life Sciences, National University of Singapore, 28 Medical Drive, Singapore 117456,
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Kuleshova LL, Tan FCK, Magalhães R, Gouk SS, Lee KH, Dawe GS. Effective cryopreservation of neural stem or progenitor cells without serum or proteins by vitrification. Cell Transplant 2009; 18:135-144. [PMID: 19499702] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
Development of effective cryopreservation protocols will be essential to realizing the potential for clinical application of neural stem and progenitor cells. Current cryopreservation protocols have been largely employed in research, which does not require as stringent consideration of viability and sterility. Therefore, these protocols involve the use of serum and protein additives, which can potentially introduce contaminants, and slow cooling with DMSO/glycerol-based cryopreservation solutions, which impairs cell survival. We investigated whether serum- and protein-free vitrification is effective for functional cryopreservation of neurosphere cultures of neural stem or progenitor cells. To protect the samples from introduction of other contaminants during handling and cryostorage, an original "straw-in-straw" method (250 microl sterile straw placed in 500 microl straw) for direct immersion into liquid nitrogen and storing the samples was also introduced. The protocol employed brief step-wise exposure to vitrification solution composed of ethylene glycol (EG) and sucrose (40% v/v EG, 0.6 M sucrose) and removal of vitrification solution at room temperature. Evaluation of the effects of vitrification revealed that there were no differences between control and vitrified neural stem or progenitor cells in expression of the neural stem or progenitor cell markers, proliferation, or multipotent differentiation. This sterile method for the xeno-free cryopreservation of murine neurospheres without animal or human proteins may have the potential to serve as a starting point for the development of cryopreservation protocols for human neural stem and progenitor cells for clinical use.
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Affiliation(s)
- L L Kuleshova
- Low Temperature Preservation Unit, National University Medical Institutes, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
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Tan FCK, Lee KH, Gouk SS, Magalhaes R, Poonepalli A, Hande MP, Dawe GS, Kuleshova LL. Optimization of cryopreservation of stem cells cultured as neurospheres: comparison between vitrification, slow-cooling and rapid cooling freezing protocols. Cryo Letters 2007; 28:445-460. [PMID: 18183325] [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: 05/25/2023]
Abstract
We compared cryopreservation of mammalian neural stem cells (NSCs) cultured as neurospheres by slow-cooling (1 C/min) in 10% (v/v) DMSO and cryopreservation by immersion into liquid nitrogen in ethylene glycol (EG)-sucrose solutions that support vitrification (40% (v/v) EG, 0.6 M sucrose) or that do not (37% v/v) EG, 0.6 M sucrose and 30% (v/v) EG, 0.6 M sucrose); the concentration of penetrating cryoprotectant in the last two solutions was lowered with the intention to reduce their toxicity towards NSCs. To protect against contamination a straw-in-straw technique was employed. Vitrification offered the best combination of preservation of structural integrity of neurospheres, cell viability (>96%), multipotency and karyotype. Rapid cooling in 37% (v/v) EG, 0.6 M sucrose afforded good viability but did not preserve structural integrity. Rapid cooling in 30% (v/v) EG, 0.6 M sucrose additionally reduced cell viability to 77%. Slow-cooling reduced cell viability to 65% and damaged the neurospheres. This study suggests that, in contrast to freezing, vitrification has immense potential for the cryopreservation of stem cells cultured as neurospheres or in other structured cultures.
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Affiliation(s)
- Francis Chee Kuan Tan
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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