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Day M, Belal M, Surmeier WC, Melendez A, Wokosin D, Tkatch T, Clarke VRJ, Surmeier DJ. GABAergic regulation of striatal spiny projection neurons depends upon their activity state. PLoS Biol 2024; 22:e3002483. [PMID: 38295323 PMCID: PMC10830145 DOI: 10.1371/journal.pbio.3002483] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 12/26/2023] [Indexed: 02/02/2024] Open
Abstract
Synaptic transmission mediated by GABAA receptors (GABAARs) in adult, principal striatal spiny projection neurons (SPNs) can suppress ongoing spiking, but its effect on synaptic integration at subthreshold membrane potentials is less well characterized, particularly those near the resting down-state. To fill this gap, a combination of molecular, optogenetic, optical, and electrophysiological approaches were used to study SPNs in mouse ex vivo brain slices, and computational tools were used to model somatodendritic synaptic integration. In perforated patch recordings, activation of GABAARs, either by uncaging of GABA or by optogenetic stimulation of GABAergic synapses, evoked currents with a reversal potential near -60 mV in both juvenile and adult SPNs. Transcriptomic analysis and pharmacological work suggested that this relatively positive GABAAR reversal potential was not attributable to NKCC1 expression, but rather to HCO3- permeability. Regardless, from down-state potentials, optogenetic activation of dendritic GABAergic synapses depolarized SPNs. This GABAAR-mediated depolarization summed with trailing ionotropic glutamate receptor (iGluR) stimulation, promoting dendritic spikes and increasing somatic depolarization. Simulations revealed that a diffuse dendritic GABAergic input to SPNs effectively enhanced the response to dendritic iGluR signaling and promoted dendritic spikes. Taken together, our results demonstrate that GABAARs can work in concert with iGluRs to excite adult SPNs when they are in the resting down-state, suggesting that their inhibitory role is limited to brief periods near spike threshold. This state-dependence calls for a reformulation for the role of intrastriatal GABAergic circuits.
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Affiliation(s)
- Michelle Day
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Marziyeh Belal
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - William C. Surmeier
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Alexandria Melendez
- Department of Neurology, Baylor College of Medicine, Houston, Texas, United States of America
| | - David Wokosin
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
| | - Tatiana Tkatch
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
- Aligning Science Across Parkinson’s (ASAP) Collaborative Research Network, Chevy Chase, Maryland, United States of America
| | - Vernon R. J. Clarke
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
- Aligning Science Across Parkinson’s (ASAP) Collaborative Research Network, Chevy Chase, Maryland, United States of America
| | - D. James Surmeier
- Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
- Aligning Science Across Parkinson’s (ASAP) Collaborative Research Network, Chevy Chase, Maryland, United States of America
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Gonzalez-Mancebo E, Gandolfo-Cano MM, Trujillo-Trujillo MJ, Mohedano-Vicente E, Calso A, Juarez R, Melendez A, Morales P, Pajuelo F. Analysis of the effectiveness of training school personnel in the management of food allergy and anaphylaxis. Allergol Immunopathol (Madr) 2019; 47:60-63. [PMID: 30193885 DOI: 10.1016/j.aller.2018.05.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 04/10/2018] [Accepted: 05/10/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Food allergy is a very frequent and increasingly common disease in children and adolescents. It affects quality of life and can even be life-threatening. Given that 10-18% of allergic/anaphylactic food reactions take place in schools, it is essential to provide school personnel with training on the management of reactions. METHODS The Allergy Unit of Hospital Universitario de Fuenlabrada, Spain, organized a conference entitled "Management of Food Allergy in Children and Adolescents in School Centers" during which teachers, cooks, cafeteria monitors, and summer-camp leaders underwent a training course. Attendees filled out a questionnaire with eight questions before and after the course to assess their self-efficacy in management of food allergy and anaphylaxis. The results were compared. RESULTS A total of 191 people participated (51% dining-room monitors, 24% teachers, 13% cooks, and 12% other professions). The areas in which the attendees presented the lowest confidence before receiving the course were recognition of symptoms and treatment of the reactions/anaphylaxis. The mean score for each of the eight concepts evaluated improved after the training course. This improvement was significant in the management of anaphylaxis. CONCLUSIONS Our study demonstrates the usefulness of a self-efficacy scale in school personnel as a tool to assess the ability to manage food allergy and anaphylaxis. It can help to identify problem areas in which more specific training programs can be implemented.
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Affiliation(s)
- E Gonzalez-Mancebo
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain.
| | - M M Gandolfo-Cano
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - M J Trujillo-Trujillo
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - E Mohedano-Vicente
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - A Calso
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - R Juarez
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - A Melendez
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - P Morales
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
| | - F Pajuelo
- Allergy Unit, Hospital Universitario de Fuenlabrada, C° del Molino 2, 28942 Fuenlabrada, Madrid, Spain
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Jimenez P, Melendez A, Albers U. Psychological effects of Tai Chi Chuan. Arch Gerontol Geriatr 2012; 55:460-7. [DOI: 10.1016/j.archger.2012.02.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 02/02/2012] [Accepted: 02/03/2012] [Indexed: 10/28/2022]
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Gonzalez-Mancebo E, Gonzalez-de-Olano D, Trujillo M, Santos S, Gandolfo-Cano M, Melendez A, Juarez R, Morales P, Calso A, Mazuela O. Prevalence of Sensitization to Lipid Transfer Proteins (LTP) and Profilins in a Population of 430 patients in the center of Spain. J Allergy Clin Immunol 2011. [DOI: 10.1016/j.jaci.2010.12.144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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González-Mancebo E, Pastor C, González-de-Olano D, Gandolfo-Cano M, Melendez A, Cuesta J, Zapatero A, Bartolomé B. Identification of allergens in chicken meat allergy. J Investig Allergol Clin Immunol 2011; 21:326-327. [PMID: 21721387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
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Arichi T, Moraux A, Melendez A, Doria V, Groppo M, Merchant N, Combs S, Burdet E, Larkman DJ, Counsell SJ, Beckmann CF, Edwards AD. Somatosensory cortical activation identified by functional MRI in preterm and term infants. Neuroimage 2009; 49:2063-71. [PMID: 19854281 DOI: 10.1016/j.neuroimage.2009.10.038] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Revised: 09/03/2009] [Accepted: 10/13/2009] [Indexed: 10/20/2022] Open
Abstract
Functional MRI (fMRI) has not previously been used systematically to investigate brain function in preterm infants. We here describe statistically robust and reproducible fMRI results in this challenging subject group using a programmable somatosensory stimulus synchronized with MR image acquisition which induced well-localized positive blood oxygen level dependent (BOLD) responses contralateral to the side of the stimulation in: 11 preterm infants (median post menstrual age 33 weeks and 4 days, range 29+1 to 35+3); 6 control infants born at term gestational age; and 18 infants born preterm (median gestational age at birth 30 weeks and 5 days, range 25+4 to 36+0) but studied at term corrected gestational age. Bilateral signals were identified in 8 of the ex-preterm infants at term age. Anatomical confirmation of appropriate activations was provided with diffusion tensor imaging (DTI) based tractography which identified connecting pathways from the regions of activation through the ipsilateral corticospinal tracts and posterior limb of the internal capsule. These results demonstrate that it is possible to reliably identify positive BOLD signals in the infant brain and that fMRI techniques can also be applied in the study of preterm infants.
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Affiliation(s)
- T Arichi
- Division of Clinical Sciences, Imperial College London, and MRC Clinical Sciences Centre, Hammersmith Hospital, London, UK
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Nanda NC, Nekkanti R, Melendez A, Kang SW, Baker C, Yousif AM, Ahmed S. Transesophageal two-dimensional echocardiographic demonstration of the innominate artery and its branches. The American Journal of Geriatric Cardiology 2001; 10:368-70. [PMID: 11684923 DOI: 10.1111/j.1076-7460.2001.00047.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- N C Nanda
- Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35249, USA.
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Abstract
With a renewed interest in continuous flow peritoneal dialysis (CFPD), our standard practice of implanting a second catheter in those patients facing access failure provided us the opportunity to perform acute studies on CFPD in these patients, since it temporarily provided us with two catheters. Four patients were studied, with a total of five studies performed. A standard protocol was followed utilizing 1.5% dextrose solution, a 2 L fill, an inflow rate of 200 ml/min with a proportionate outflow for a 4-hour session. A full drain was performed at the end of the study. Our results provided us with a mean effective peritoneal clearance for urea (KpeU) and creatinine (KpeCr) of 40 ml/min and 28 ml/min, respectively, and a mean ultrafiltration rate (Qf) of 13.4 ml/min. Our average mass transfer coefficient (MTC) for urea was 40 ml/min, consistent with kinetic modeling and historical data. The Kpe, MTC, and Qf achieved are significantly higher than other investigators, which could possibly be explained by those obtained by two separate catheters resulting in adequate mixing of the dialysate. These clinical results provide a solid foundation for the future development of this PD modality.
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Affiliation(s)
- C Cruz
- Fresenius Neomedica, Chicago, Illinois 60611, USA
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Melendez A, Floto RA, Gillooly DJ, Harnett MM, Allen JM. FcgammaRI coupling to phospholipase D initiates sphingosine kinase-mediated calcium mobilization and vesicular trafficking. J Biol Chem 1998; 273:9393-402. [PMID: 9545263 DOI: 10.1074/jbc.273.16.9393] [Citation(s) in RCA: 153] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aggregation of receptors specific for the constant region of immunoglobulin G activates a repertoire of monocyte responses that can lead ultimately to targeted cell killing via antibody-directed cellular cytotoxicity. The high affinity receptor, FcgammaRI, contains no recognized signaling motif in its cytoplasmic tail but rather utilizes the gamma-chain of FcepsilonRI as an accessory molecule to recruit tyrosine kinases for signal transduction. We show here that, in a human monocytic cell line primed with interferon-gamma, FcgammaRI mobilizes intracellular calcium stores using a novel pathway that involves tyrosine kinase coupling to phospholipase D and resultant downstream activation of sphingosine kinase. Moreover, FcgammaRI is not coupled to phospholipase C; hence, calcium release from intracellular stores occurred in the absence of any measurable rise in inositol triphosphate. Finally, as this novel activation pathway is also shown to be responsible for mediating the vesicular trafficking of internalized immune complexes for degradation, it is likely to play a key role in controlling intracellular events triggered by FcgammaRI.
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Affiliation(s)
- A Melendez
- Department of Medicine and Therapeutics and Division of Biochemistry and Molecular Biology, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
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Melendez A, Floto RA, Cameron AJ, Gillooly DJ, Harnett MM, Allen JM. A molecular switch changes the signalling pathway used by the Fc gamma RI antibody receptor to mobilise calcium. Curr Biol 1998; 8:210-21. [PMID: 9501983 DOI: 10.1016/s0960-9822(98)70085-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Leukocytes express Fc gamma receptors, which are specific for the constant region of immunoglobulin G. Aggregation of these receptors activates a repertoire of responses that can lead to targeted cell killing by antibody-directed cellular cytotoxicity. The nature of the myeloid response to Fc gamma receptor aggregation is highly variable and depends on the maturation state of the cell, but little is known about the signalling mechanisms underlying this variability. RESULTS We show here that differentiation of a monocytic cell line, U937, to a more macrophage phenotype resulted in an absolute and fundamental switch in the nature of the phospholipid signalling pathway recruited following Fc gamma receptor aggregation. In cytokine-primed monocytes, aggregation of the high-affinity receptor Fc gamma RI resulted in the activation of phospholipase D and sphingosine kinase, which in turn led to the transient release of stored calcium; these effects were mediated by the gamma chain, an Fc gamma RI accessory protein. In contrast, in cells differentiated to a more macrophage type, aggregation of Fc gamma RI resulted in the Fc gamma RIIa-mediated activation of phospholipase C, and the resulting calcium response was prolonged as calcium entry was stimulated. CONCLUSIONS The switch in Fc gamma RI signalling pathways upon monocyte differentiation is mediated by a switch in the accessory molecule recruited by Fc gamma RI, which lacks its own intrinsic signal transduction motif. As many immune receptors have separate polypeptide chains for ligand binding and signal transduction (allowing a similar switch in signalling pathways), the mechanism described here is likely to be widely used.
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Affiliation(s)
- A Melendez
- Department of Medicine & Therapeutics, University of Glasgow, Scotland, UK
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Melendez A, Harnett MM, Allen JM. Differentiation dependent switch in signalling pathways initiated by Fc gamma RI. Biochem Soc Trans 1997; 25:254S. [PMID: 9191298 DOI: 10.1042/bst025254s] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- A Melendez
- Division of Biochemistry & Molecular Biology, University of Glasgow
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Alonso A, Floquet M, Mas JR, Melendez A. Evolution paléogéographique des plates-formes de la Meseta Nord-Castillane et de la Cordillère Ibérique (Espagne) au Sénonien. ACTA ACUST UNITED AC 1983. [DOI: 10.3406/geolm.1983.1278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Schweickert H, El Miligy A, Melendez A, Lorenz W. Mathematical treatment of galvanostatic double pulse method applied to consecutive charge transfer reactions. ACTA ACUST UNITED AC 1976. [DOI: 10.1016/s0022-0728(76)80299-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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