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Cruz-Muñoz JR, Valdez-Morales EE, Barajas-Espinosa A, Barrios-García T, Liñán-Rico A, Guerrero-Alba R. Gene expression alterations of purinergic signaling components in obesity-associated intestinal low-grade inflammation in type 2 diabetes. Purinergic Signal 2024:10.1007/s11302-024-10006-1. [PMID: 38587723 DOI: 10.1007/s11302-024-10006-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 03/26/2024] [Indexed: 04/09/2024] Open
Abstract
Intestinal low-grade inflammation induced by a high-fat diet has been found to detonate chronic systemic inflammation, which is a hallmark of obesity, and precede the apparition of insulin resistance, a key factor for developing type 2 diabetes (T2D). Aberrant purinergic signaling pathways have been implicated in the pathogenesis of inflammatory bowel disease and other gastrointestinal diseases. However, their role in the gut inflammation associated with obesity and T2D remains unexplored. C57BL/6 J mice were fed a cafeteria diet for 21 weeks and received one injection of streptozotocin in their sixth week into the diet. The gene expression profile of purinergic signaling components in colon tissue was assessed by RT-qPCR. Compared to control mice, the treated group had a significant reduction in colonic length and mucosal and muscular layer thickness accompanied by increased NF-κB and IL-1β mRNA expression. Furthermore, colonic P2X2, P2X7, and A3R gene expression levels were lower, while the P2Y2, NT5E, and ADA expression levels increased. In conclusion, these data suggest that these purinergic signaling components possibly play a role in intestinal low-grade inflammation associated with obesity and T2D and thus could represent a novel therapeutic target for the treatment of the metabolic complications related to these diseases.
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Affiliation(s)
- José R Cruz-Muñoz
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México
| | - Eduardo E Valdez-Morales
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México
| | - Alma Barajas-Espinosa
- Escuela Superior de Huejutla, Universidad Autónoma del Estado de Hidalgo, Huejutla de Reyes, Hidalgo, México
| | - Tonatiuh Barrios-García
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México
| | - Andrómeda Liñán-Rico
- Centro Universitario de Investigaciones Biomédicas. Consejo Nacional de Humanidades, Ciencia y Tecnología (CONAHCYT), Universidad de Colima, Colima, México.
| | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México.
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Valdez-Morales EE, Sánchez-Navarro CA, Reyes-Pavón D, Barrios-Garcia T, Ochoa-Cortes F, Barajas-Espinosa A, Barragán-Iglesias P, Guerrero-Alba R. TNF-α enhances sensory DRG neuron excitability through modulation of P2X3 receptors in an acute colitis model. Front Immunol 2022; 13:872760. [PMID: 36032155 PMCID: PMC9416886 DOI: 10.3389/fimmu.2022.872760] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 07/18/2022] [Indexed: 11/15/2022] Open
Abstract
Previous studies have demonstrated that acute colonic inflammation leads to an increase in dorsal root ganglia (DRG) neuronal excitability. However, the signaling elements implicated in this hyperexcitability have yet to be fully unraveled. Extracellular adenosine 5’-triphosphate (ATP) is a well-recognized sensory signaling molecule that enhances the nociceptive response after inflammation through activation of P2X3 receptors, which are expressed mainly by peripheral sensory neurons. The aim of this study is to continue investigating how P2X3 affects neuronal hypersensitivity in an acute colitis animal model. To achieve this, DNBS (Dinitrobenzene sulfonic acid; 200 mg/kg) was intrarectally administered to C57BL/6 mice, and inflammation severity was assessed according to the following parameters: weight loss, macroscopic and microscopic scores. Perforated patch clamp technique was used to evaluate neuronal excitability via measuring changes in rheobase and action potential firing in T8-L1 DRG neurons. A-317491, a well-established potent and selective P2X3 receptor antagonist, served to dissect their contribution to recorded responses. Protein expression of P2X3 receptors in DRG was evaluated by western blotting and immunofluorescence. Four days post-DNBS administration, colons were processed for histological analyses of ulceration, crypt morphology, goblet cell density, and immune cell infiltration. DRG neurons from DNBS-treated mice were significantly more excitable compared with controls; these changes correlated with increased P2X3 receptor expression. Furthermore, TNF-α mRNA expression was also significantly higher in inflamed colons compared to controls. Incubation of control DRG neurons with TNF-α resulted in similar cell hyperexcitability as measured in DNBS-derived neurons. The selective P2X3 receptor antagonist, A-317491, blocked the TNF-α-induced effect. These results support the hypothesis that TNF-α enhances colon-innervating DRG neuron excitability via modulation of P2X3 receptor activity.
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Affiliation(s)
| | - Carlos A. Sánchez-Navarro
- Departamento de Medicina, Centro de Ciencias de la Salud , Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Diana Reyes-Pavón
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Tonatiuh Barrios-Garcia
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Fernando Ochoa-Cortes
- Licenciatura en Enfermería, Escuela Superior de Huejutla, Universidad Autónoma del Estado de Hidalgo, Hidalgo, Mexico
| | - Alma Barajas-Espinosa
- Licenciatura en Enfermería, Escuela Superior de Huejutla, Universidad Autónoma del Estado de Hidalgo, Hidalgo, Mexico
| | - Paulino Barragán-Iglesias
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
- *Correspondence: Raquel Guerrero-Alba,
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Marichal-Cancino BA, González-Hernández A, Guerrero-Alba R, Medina-Santillán R, Villalón CM. A critical review of the neurovascular nature of migraine and the main mechanisms of action of prophylactic antimigraine medications. Expert Rev Neurother 2021; 21:1035-1050. [PMID: 34388955 DOI: 10.1080/14737175.2021.1968835] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Migraine involves neurovascular, functional, and anatomical alterations. Migraineurs experience an intense unilateral and pulsatile headache frequently accompanied with vomiting, nausea, photophobia, etc. Although there is no ideal preventive medication, frequency in migraine days may be partially decreased by some prophylactics, including antihypertensives, antidepressants, antiepileptics, and CGRPergic inhibitors. However, the mechanisms of action involved in antimigraine prophylaxis remain elusive. AREAS COVERED This review recaps some of the main neurovascular phenomena related to migraine and currently available preventive medications. Moreover, it discusses the major mechanisms of action of the recommended prophylactic medications. EXPERT OPINION In the last three years, migraine prophylaxis has evolved from nonspecific to specific antimigraine treatments. Overall, nonspecific treatments mainly involve neural actions, whereas specific pharmacotherapy (represented by CGRP receptor antagonists and CGRPergic monoclonal antibodies) is predominantly mediated by neurovascular mechanisms that may include, among others: (i) reduction in the cortical spreading depression (CSD)-associated events; (ii) inhibition of pain sensitization; (iii) blockade of neurogenic inflammation; and/or (iv) increase in cranial vascular tone. Accordingly, the novel antimigraine prophylaxis promises to be more effective, devoid of significant adverse effects (unlike nonspecific treatments), and more beneficial for the quality of life of migraineurs.
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Affiliation(s)
- Bruno A Marichal-Cancino
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México
| | | | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, México
| | - Roberto Medina-Santillán
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina IPN, Ciudad de México C.P, México
| | - Carlos M Villalón
- Departamento de Farmacobiología, Cinvestav-Coapa, Ciudad de México, México
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Franco-Servín C, Neri-Castro E, Bénard-Valle M, Alagón A, Rosales-García RA, Guerrero-Alba R, Poblano-Sánchez JE, Silva-Briano M, Guerrero-Barrera AL, Sigala-Rodríguez JJ. Biological and Biochemical Characterization of Coronado Island Rattlesnake ( Crotalus helleri caliginis) Venom and Antivenom Neutralization. Toxins (Basel) 2021; 13:toxins13080582. [PMID: 34437453 PMCID: PMC8402616 DOI: 10.3390/toxins13080582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 01/18/2023] Open
Abstract
The Baja California Peninsula has over 250 islands and islets with many endemic species. Among them, rattlesnakes are the most numerous but also one of the least studied groups. The study of island rattlesnake venom could guide us to a better understanding of evolutionary processes and the description of novel toxins. Crotalus helleri caliginis venom samples were analyzed to determine possible ontogenetic variation with SDS-PAGE in one and two dimensions and with RP-HPLC. Western Blot, ELISA, and amino-terminal sequencing were used to determine the main components of the venom. The biological and biochemical activities demonstrate the similarity of C. helleri caliginis venom to the continental species C. helleri helleri, with both having low proteolytic and phospholipase A2 (PLA2) activity but differing due to the absence of neurotoxin (crotoxin-like) in the insular species. The main components of the snake venom were metalloproteases, serine proteases, and crotamine, which was the most abundant toxin group (30–35% of full venom). The crotamine was isolated using size-exclusion chromatography where its functional effects were tested on mouse phrenic nerve–hemidiaphragm preparations in which a significant reduction in muscle twitch contractions were observed. The two Mexican antivenoms could neutralize the lethality of C. helleri caliginis venom but not the crotamine effects.
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Affiliation(s)
- Cristian Franco-Servín
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
- Colección Zoológica, Departamento de Biología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
| | - Edgar Neri-Castro
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001 Colonia Chamilpa, Cuernavaca CP 62210, Morelos, Mexico; (E.N.-C.); (M.B.-V.); (A.A.)
| | - Melisa Bénard-Valle
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001 Colonia Chamilpa, Cuernavaca CP 62210, Morelos, Mexico; (E.N.-C.); (M.B.-V.); (A.A.)
| | - Alejandro Alagón
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad # 2001 Colonia Chamilpa, Cuernavaca CP 62210, Morelos, Mexico; (E.N.-C.); (M.B.-V.); (A.A.)
| | - Ramsés Alejandro Rosales-García
- Colección Zoológica, Departamento de Biología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
| | - Raquel Guerrero-Alba
- Laboratorio de Electrofisiología, Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
| | - José Emanuel Poblano-Sánchez
- Laboratorio Clínico de Especialidades del Hospital General ISSSTE, Av. Universidad 410, Aguascalientes CP 20010, Ags, Mexico;
| | - Marcelo Silva-Briano
- Laboratorio de Ecología, Departamento de Biología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
| | - Alma Lilián Guerrero-Barrera
- Laboratorio de Biología Celular y Tisular, Departamento de Morfología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
- Correspondence: (A.L.G.-B.); (J.J.S.-R.)
| | - José Jesús Sigala-Rodríguez
- Colección Zoológica, Departamento de Biología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Av. Universidad 940, Aguascalientes CP 20131, Ags, Mexico;
- Correspondence: (A.L.G.-B.); (J.J.S.-R.)
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Vargas-Martínez EM, Gómez-Coronado KS, Espinosa-Luna R, Valdez-Morales EE, Barrios-García T, Barajas-Espinosa A, Ochoa-Cortes F, Montaño LM, Barajas-López C, Guerrero-Alba R. Functional expression of P2X1, P2X4 and P2X7 purinergic receptors in human monocyte-derived macrophages. Eur J Pharmacol 2020; 888:173460. [PMID: 32805257 DOI: 10.1016/j.ejphar.2020.173460] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/20/2020] [Accepted: 07/31/2020] [Indexed: 12/27/2022]
Abstract
This study sought to examine the co-expression of the following purinergic receptor subunits: P2X1, P2X1del, P2X4, and P2X7 and characterize the P2X response in human monocyte-derived macrophages (MDMs). Single-cell RT-PCR shows the presence of P2X1, P2X1del, P2X4, and P2X7 mRNA in 40%, 5%, 20%, and 90% of human MDMs, respectively. Of the studied human MDMs, 25% co-expressed P2X1 and P2X7 mRNA; 5% co-expressed P2X4 and P2X7; and 15% co-expressed P2X1, P2X4, and P2X7 mRNA. In whole-cell patch clamp recordings of human MDMs, rapid application of ATP (0.01 mM) evoked fast current activation and two different desensitization kinetics: 1. a rapid desensitizing current antagonized by PPADS (1 μM), reminiscent of the P2X1 receptor's current; 2. a slow desensitizing current, insensitive to PPADS but potentiated by ivermectin (3 μM), similar to the P2X4 receptor's current. Application of 5 mM ATP induced three current modalities: 1. slow current activation with no desensitization, similar to the P2X7 receptor current, present in 69% of human macrophages and antagonized by A-804598 (0.1 μM); 2. fast current activation and fast desensitization, present in 15% of human MDMs; 3. fast activation current followed by biphasic desensitization, observed in 15% of human MDMs. Both rapid and biphasic desensitization kinetics resemble those observed for the recombinant human P2X1 receptor expressed in oocytes. These data demonstrate, for the first time, the co-expression of P2X1, P2X4, and P2X7 transcripts and confirm the presence of functional P2X1, P2X4, and P2X7 receptors in human macrophages.
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Affiliation(s)
- Eydie M Vargas-Martínez
- División de Biología Molecular, Instituto Potosino Investigación Científica y Tecnológica, San Luis Potosí, SLP, México
| | - Karen S Gómez-Coronado
- División de Biología Molecular, Instituto Potosino Investigación Científica y Tecnológica, San Luis Potosí, SLP, México
| | - Rosa Espinosa-Luna
- División de Biología Molecular, Instituto Potosino Investigación Científica y Tecnológica, San Luis Potosí, SLP, México
| | - Eduardo E Valdez-Morales
- Catedras CONACYT, Departamento de Medicina, Centro de Ciencias de la Salud, Universidad Autónoma de Aguascalientes, Aguascalientes, México
| | - Tonatiuh Barrios-García
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, México
| | - Alma Barajas-Espinosa
- Licenciatura en Enfermería, Escuela Superior de Huejutla, Universidad Autónoma del Estado de Hidalgo, Huejutla de Reyes, Hidalgo, México
| | - Fernando Ochoa-Cortes
- Licenciatura en Enfermería, Escuela Superior de Huejutla, Universidad Autónoma del Estado de Hidalgo, Huejutla de Reyes, Hidalgo, México
| | - Luis M Montaño
- Departamento de Farmacología, Facultad de Medicina, Universidad Nacional Autónoma de México, CDMX, México
| | - Carlos Barajas-López
- División de Biología Molecular, Instituto Potosino Investigación Científica y Tecnológica, San Luis Potosí, SLP, México
| | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, México.
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Allende G, Chávez-Reyes J, Guerrero-Alba R, Vázquez-León P, Marichal-Cancino BA. Advances in Neurobiology and Pharmacology of GPR12. Front Pharmacol 2020; 11:628. [PMID: 32457622 PMCID: PMC7226366 DOI: 10.3389/fphar.2020.00628] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 01/20/2020] [Accepted: 04/21/2020] [Indexed: 01/19/2023] Open
Abstract
GPR12 is a G protein-coupled orphan receptor genetically related to type 1 and type 2 cannabinoid receptors (CB1 and CB2) which are ancient proteins expressed all over the body. Both cannabinoid receptors, but especially CB1, are involved in neurodevelopment and cognitive processes such as learning, memory, brain reward, coordination, etc. GPR12 shares with CB1 that both are mainly expressed into the brain. Regrettably, very little is known about physiology of GPR12. Concerning its pharmacology, GPR12 seems to be endogenously activated by the lysophospholipids sphingosine-1-phosphate (S1P) and sphingosyl-phosphorylcholine (SPC). Exogenously, GPR12 is a target for the phytocannabinoid cannabidiol (CBD). Functionally, GPR12 seems to be related to neurogenesis and neural inflammation, but its relationship with cognitive functions remains to be characterized. Although GPR12 was initially suggested to be a cannabinoid receptor, it does not meet the five criteria proposed in 2010 by the International Union of Basic and Clinical Pharmacology (IUPHAR). In this review, we analyze all the direct available information in PubMed database about expression, function, and pharmacology of this receptor in central nervous system (CNS) trying to provide a broad overview of its current and prospective neurophysiology. Moreover, in this mini-review we highlight the need to produce more relevant data about the functions of GPR12 in CNS. Hence, this work should motivate further research in this field.
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Affiliation(s)
- Gonzalo Allende
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Ciudad Universitaria, Aguascalientes, Mexico
| | - Jesús Chávez-Reyes
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Ciudad Universitaria, Aguascalientes, Mexico
| | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Ciudad Universitaria, Aguascalientes, Mexico
| | - Priscila Vázquez-León
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Ciudad Universitaria, Aguascalientes, Mexico
| | - Bruno A Marichal-Cancino
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Ciudad Universitaria, Aguascalientes, Mexico
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Guerrero-Alba R, Barragán-Iglesias P, González-Hernández A, Valdez-Moráles EE, Granados-Soto V, Condés-Lara M, Rodríguez MG, Marichal-Cancino BA. Some Prospective Alternatives for Treating Pain: The Endocannabinoid System and Its Putative Receptors GPR18 and GPR55. Front Pharmacol 2019; 9:1496. [PMID: 30670965 PMCID: PMC6331465 DOI: 10.3389/fphar.2018.01496] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [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: 08/27/2018] [Accepted: 12/07/2018] [Indexed: 12/12/2022] Open
Abstract
Background: Marijuana extracts (cannabinoids) have been used for several millennia for pain treatment. Regarding the site of action, cannabinoids are highly promiscuous molecules, but only two cannabinoid receptors (CB1 and CB2) have been deeply studied and classified. Thus, therapeutic actions, side effects and pharmacological targets for cannabinoids have been explained based on the pharmacology of cannabinoid CB1/CB2 receptors. However, the accumulation of confusing and sometimes contradictory results suggests the existence of other cannabinoid receptors. Different orphan proteins (e.g., GPR18, GPR55, GPR119, etc.) have been proposed as putative cannabinoid receptors. According to their expression, GPR18 and GPR55 could be involved in sensory transmission and pain integration. Methods: This article reviews select relevant information about the potential role of GPR18 and GPR55 in the pathophysiology of pain. Results: This work summarized novel data supporting that, besides cannabinoid CB1 and CB2 receptors, GPR18 and GPR55 may be useful for pain treatment. Conclusion: There is evidence to support an antinociceptive role for GPR18 and GPR55.
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Affiliation(s)
- Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Paulino Barragán-Iglesias
- School of Behavioral and Brain Sciences and Center for Advanced Pain Studies, University of Texas at Dallas, Richardson, TX, United States
| | - Abimael González-Hernández
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Santiago de Querétaro, Mexico
| | - Eduardo E Valdez-Moráles
- Cátedras CONACYT, Departamento de Cirugía, Centro de Ciencias Biomédicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Vinicio Granados-Soto
- Neurobiology of Pain Laboratory, Departamento de Farmacobiología, Cinvestav, Mexico City, Mexico
| | - Miguel Condés-Lara
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Santiago de Querétaro, Mexico
| | - Martín G Rodríguez
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Bruno A Marichal-Cancino
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
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Méndez-Barredo LH, Rodríguez-Meléndez JG, Gómez-Coronado KS, Guerrero-Alba R, Valdez-Morales EE, Espinosa-Luna R, Barajas-Espinosa A, Barajas-López C. Physiological Concentrations of Zinc Have Dual Effects on P2X Myenteric Receptors of Guinea Pig. Cell Mol Neurobiol 2018; 38:1439-1449. [PMID: 30109516 DOI: 10.1007/s10571-018-0612-7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 08/09/2018] [Indexed: 10/28/2022]
Abstract
We, hereby, characterize the pharmacological effects of physiological concentrations of Zinc on native myenteric P2X receptors from guinea-pig small intestine and on P2X2 isoforms present in most myenteric neurons. This is the first study describing opposite effects of Zinc on these P2X receptors. It was not possible to determine whether both effects were concentration dependent, yet the inhibitory effect was mediated by competitive antagonism and was concentration dependent. The potentiating effect appears to be mediated by allosteric changes induced by Zinc on P2X myenteric channels, which is more frequently observed in myenteric neurons with low zinc concentrations. In P2X2-1 and P2X2-2 variants, the inhibitory effect is more common than in P2X myenteric channels. However, in the variants, the potentiatory effect is of equal magnitude as the inhibitory effect. Inhibitory and potentiatory effects are likely mediated by different binding sites that appear to be present on both P2X2 variants. In conclusion, in myenteric native P2X receptors, Zinc has quantitatively different pharmacological effects compared to those observed on homomeric channels: P2X2-1 and P2X2-2. Potentiatory and inhibitory Zinc effects upon these receptors are mediated by two different binding sites. All our data suggest that myenteric P2X receptors have a more complex pharmacology than those of the recombinant P2X2 receptors, which is likely related to other subunits known to be expressed in myenteric neurons. Because these dual effects occur at Zinc physiological concentrations, we suggest that they could be involved in physiological and pathological processes.
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Affiliation(s)
- Liliana H Méndez-Barredo
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a Sección, CP78216, San Luis Potosí, SLP, Mexico
| | - Jessica G Rodríguez-Meléndez
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a Sección, CP78216, San Luis Potosí, SLP, Mexico
| | - Karen S Gómez-Coronado
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a Sección, CP78216, San Luis Potosí, SLP, Mexico
| | - Raquel Guerrero-Alba
- Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, Mexico
| | - Eduardo E Valdez-Morales
- Cátedra CONACyT, Departamento de Cirugía, Centro de Ciencias de la Salud, Universidad Autónoma de Aguascalientes, Aguascalientes, Ags, Mexico
| | - Rosa Espinosa-Luna
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a Sección, CP78216, San Luis Potosí, SLP, Mexico
| | - Alma Barajas-Espinosa
- Cátedra CONACyT, Departamento de Fisiología y Biofísica, Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, SLP, Mexico
| | - Carlos Barajas-López
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055, Col. Lomas 4a Sección, CP78216, San Luis Potosí, SLP, Mexico.
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Guerrero-Alba R, Valdez-Morales EE, Jiménez-Vargas NN, Bron R, Poole D, Reed D, Castro J, Campaniello M, Hughes PA, Brierley SM, Bunnett N, Lomax AE, Vanner S. Co-expression of μ and δ opioid receptors by mouse colonic nociceptors. Br J Pharmacol 2018; 175:2622-2634. [PMID: 29579315 DOI: 10.1111/bph.14222] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 02/27/2018] [Accepted: 03/01/2018] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND AND PURPOSE To better understand opioid signalling in visceral nociceptors, we examined the expression and selective activation of μ and δ opioid receptors by dorsal root ganglia (DRG) neurons innervating the mouse colon. EXPERIMENTAL APPROACH DRG neurons projecting to the colon were identified by retrograde tracing. δ receptor-GFP reporter mice, in situ hybridization, single-cell RT-PCR and μ receptor-specific antibodies were used to characterize expression of μ and δ receptors. Voltage-gated Ca2+ currents and neuronal excitability were recorded in small diameter nociceptive neurons (capacitance <30 pF) by patch clamp and ex vivo single-unit afferent recordings were obtained from the colon. KEY RESULTS In situ hybridization of oprm1 expression in Fast Blue-labelled DRG neurons was observed in 61% of neurons. μ and δ receptors were expressed by 36-46% of colon DRG neurons, and co-expressed by ~25% of neurons. μ and δ receptor agonists inhibited Ca2+ currents in DRG, effects blocked by opioid antagonists. One or both agonists inhibited action potential firing by colonic afferent endings. Incubation of neurons with supernatants from inflamed colon segments inhibited Ca2+ currents and neuronal excitability. Antagonists of μ, but not δ receptors, inhibited the effects of these supernatant on Ca2+ currents, whereas both antagonists inhibited their actions on neuronal excitability. CONCLUSIONS AND IMPLICATIONS A significant number of small diameter colonic nociceptors co-express μ and δ receptors and are inhibited by agonists and endogenous opioids in inflamed tissues. Thus, opioids that act at μ or δ receptors, or their heterodimers may be effective in treating visceral pain.
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Affiliation(s)
- Raquel Guerrero-Alba
- Gastrointestinal Diseases Research Unit, Queen's University, Kingston, ON, Canada
| | | | | | - Romke Bron
- Monash Institute of Pharmaceutical Sciences and Australian Research Council Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Parkville, VIC, Australia
| | - Daniel Poole
- Monash Institute of Pharmaceutical Sciences and Australian Research Council Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Parkville, VIC, Australia.,Department of Anatomy and Neuroscience, The University of Melbourne, Parkville, VIC, Australia
| | - David Reed
- Gastrointestinal Diseases Research Unit, Queen's University, Kingston, ON, Canada
| | - Joel Castro
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - Melissa Campaniello
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - Patrick A Hughes
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - Stuart M Brierley
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - Nigel Bunnett
- Monash Institute of Pharmaceutical Sciences and Australian Research Council Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Parkville, VIC, Australia.,Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, VIC, Australia.,Departments of Surgery and Pharmacology, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Alan E Lomax
- Gastrointestinal Diseases Research Unit, Queen's University, Kingston, ON, Canada
| | - Stephen Vanner
- Gastrointestinal Diseases Research Unit, Queen's University, Kingston, ON, Canada
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10
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Guerrero-Alba R, Valdez-Morales EE, Jimenez-Vargas NN, Lopez-Lopez C, Jaramillo-Polanco J, Okamoto T, Nasser Y, Bunnett NW, Lomax AE, Vanner SJ. Stress activates pronociceptive endogenous opioid signalling in DRG neurons during chronic colitis. Gut 2017; 66:2121-2131. [PMID: 27590998 DOI: 10.1136/gutjnl-2016-311456] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 07/18/2016] [Accepted: 08/11/2016] [Indexed: 12/20/2022]
Abstract
AIMS AND BACKGROUND Psychological stress accompanies chronic inflammatory diseases such as IBD, and stress hormones can exacerbate pain signalling. In contrast, the endogenous opioid system has an important analgesic action during chronic inflammation. This study examined the interaction of these pathways. METHODS Mouse nociceptive dorsal root ganglia (DRG) neurons were incubated with supernatants from segments of inflamed colon collected from patients with chronic UC and mice with dextran sodium sulfate (cDSS)-induced chronic colitis. Stress effects were studied by adding stress hormones (epinephrine and corticosterone) to dissociated neurons or by exposing cDSS mice to water avoidance stress. Changes in excitability of colonic DRG nociceptors were measured using patch clamp and Ca2+ imaging techniques. RESULTS Supernatants from patients with chronic UC and from colons of mice with chronic colitis caused a naloxone-sensitive inhibition of neuronal excitability and capsaicin-evoked Ca2+ responses. Stress hormones decreased signalling induced by human and mouse supernatants. This effect resulted from stress hormones signalling directly to DRG neurons and indirectly through signalling to the immune system, leading to decreased opioid levels and increased acute inflammation. The net effect of stress was a change endogenous opioid signalling in DRG neurons from an inhibitory to an excitatory effect. This switch was associated with a change in G protein-coupled receptor excitatory signalling to a pathway sensitive to inhibitors of protein kinase A-protein, phospholipase C-protein and G protein βϒ subunits. CONCLUSIONS Stress hormones block the inhibitory actions of endogenous opioids and can change the effect of opioid signalling in DRG neurons to excitation. Targeting these pathways may prevent heavy opioid use in IBD.
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Affiliation(s)
- Raquel Guerrero-Alba
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada.,Departamento de Fisiología y Farmacología, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, México
| | - Eduardo E Valdez-Morales
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada.,Departamento de Cirugía, Centro de Ciencias Biomédicas, Universidad Autónoma de Aguascalientes, Cátedras CONACYT, Aguascalientes México
| | - Nestor N Jimenez-Vargas
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Cintya Lopez-Lopez
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Josue Jaramillo-Polanco
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Takanobu Okamoto
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Yasmin Nasser
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada.,Division of Gastroenterology and Hepatology, Department of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Nigel W Bunnett
- Monash Institute of Pharmaceutical Sciences and Australian Research Council Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Parkville, Australia.,Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, Victoria, Australia
| | - Alan E Lomax
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
| | - Stephen J Vanner
- GI Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Ontario, Canada
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11
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Barlow N, Nasser Y, Zhao P, Sharma N, Guerrero-Alba R, Edgington-Mitchell LE, Lieu T, Veldhuis NA, Poole DP, Conner JW, Lindström E, Craig AW, Graham B, Vanner SJ, Bunnett NW. Demonstration of elevated levels of active cathepsin S in dextran sulfate sodium colitis using a new activatable probe. Neurogastroenterol Motil 2015; 27:1675-80. [PMID: 26303377 DOI: 10.1111/nmo.12656] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 07/17/2015] [Indexed: 02/08/2023]
Abstract
BACKGROUND Proteases play a major role in inflammatory diseases of the gastrointestinal tract. Activatable probes are a major technological advance, enabling sensitive detection of active proteases in tissue samples. Our aim was to synthesize an activatable probe for cathepsin S and validate its use in a mouse model of colitis. METHODS We designed and synthesized a new fluorescent activatable probe, NB200, for the detection of active cathepsin S. Colitis was induced in C57BL/6 mice by the administration of 3% dextran sulfate sodium (DSS). Homogenized mouse colons, with or without the addition of the specific cathepsin S inhibitor MV026031, were incubated with NB200 in a fluorescent plate reader. KEY RESULTS NB200 selectively detected purified cathepsin S and not other common inflammatory proteases. Homogenates of colon from mice with DSS colitis induced a significant fluorescent increase when compared to control animals (control vs DSS: p < 0.05 at 200 min and p < 0.01 at 220-240 min), indicating cathepsin S activation. The cathepsin S inhibitor abolished this increase in fluorescence (DSS vs DSS + MV026031: p < 0.05 at 140 min, p < 0.01 at 180 min, p < 0.001 at 200-240 min), which confirms cathepsin S activation. Cathepsin S activity correlated with the disease activity index (Spearman r = 0.77, p = 0.017). CONCLUSIONS & INFERENCES Our investigation has demonstrated the utility of activatable probes for detecting protease activity in intestinal inflammation. Panels of such probes may allow 'signature' protease profiles to be established for a range of inflammatory diseases and disorders.
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Affiliation(s)
- N Barlow
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - Y Nasser
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - P Zhao
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - N Sharma
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - R Guerrero-Alba
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - L E Edgington-Mitchell
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - T Lieu
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - N A Veldhuis
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - D P Poole
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia.,Department of Anatomy and Neuroscience, University of Melbourne, Parkville, Vic., Australia
| | - J W Conner
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | | | - A W Craig
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - B Graham
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - S J Vanner
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - N W Bunnett
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
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12
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Zhao P, Lieu T, Barlow N, Metcalf M, Veldhuis N, Jensen DD, Kocan M, Sostegni S, Haerteis S, Baraznenok V, Henderson I, Lindström E, Guerrero-Alba R, Valdez-Morales EE, Liedtke W, McIntyre P, Vanner SJ, Korbmacher C, Bunnett NW. Cathepsin S causes inflammatory pain via biased agonism of PAR2 and TRPV4. J Biol Chem 2014. [DOI: 10.1074/jbc.a114.599712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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13
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Zhao P, Lieu T, Barlow N, Metcalf M, Veldhuis NA, Jensen DD, Kocan M, Sostegni S, Haerteis S, Baraznenok V, Henderson I, Lindström E, Guerrero-Alba R, Valdez-Morales EE, Liedtke W, McIntyre P, Vanner SJ, Korbmacher C, Bunnett NW. Cathepsin S causes inflammatory pain via biased agonism of PAR2 and TRPV4. J Biol Chem 2014; 289:27215-27234. [PMID: 25118282 DOI: 10.1074/jbc.m114.599712] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Serine proteases such as trypsin and mast cell tryptase cleave protease-activated receptor-2 (PAR2) at R(36)↓S(37) and reveal a tethered ligand that excites nociceptors, causing neurogenic inflammation and pain. Whether proteases that cleave PAR2 at distinct sites are biased agonists that also induce inflammation and pain is unexplored. Cathepsin S (Cat-S) is a lysosomal cysteine protease of antigen-presenting cells that is secreted during inflammation and which retains activity at extracellular pH. We observed that Cat-S cleaved PAR2 at E(56)↓T(57), which removed the canonical tethered ligand and prevented trypsin activation. In HEK and KNRK cell lines and in nociceptive neurons of mouse dorsal root ganglia, Cat-S and a decapeptide mimicking the Cat-S-revealed tethered ligand-stimulated PAR2 coupling to Gαs and formation of cAMP. In contrast to trypsin, Cat-S did not mobilize intracellular Ca(2+), activate ERK1/2, recruit β-arrestins, or induce PAR2 endocytosis. Cat-S caused PAR2-dependent activation of transient receptor potential vanilloid 4 (TRPV4) in Xenopus laevis oocytes, HEK cells and nociceptive neurons, and stimulated neuronal hyperexcitability by adenylyl cyclase and protein kinase A-dependent mechanisms. Intraplantar injection of Cat-S caused inflammation and hyperalgesia in mice that was attenuated by PAR2 or TRPV4 deletion and adenylyl cyclase inhibition. Cat-S and PAR2 antagonists suppressed formalin-induced inflammation and pain, which implicates endogenous Cat-S and PAR2 in inflammatory pain. Our results identify Cat-S as a biased agonist of PAR2 that causes PAR2- and TRPV4-dependent inflammation and pain. They expand the role of PAR2 as a mediator of protease-driven inflammatory pain.
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Affiliation(s)
- Peishen Zhao
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | - TinaMarie Lieu
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | - Nicholas Barlow
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | - Matthew Metcalf
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | | | - Dane D Jensen
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | - Martina Kocan
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia
| | - Silvia Sostegni
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Silke Haerteis
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | | | | | | | - Raquel Guerrero-Alba
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, Ontario N7L 3N6, Canada
| | - Eduardo E Valdez-Morales
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, Ontario N7L 3N6, Canada
| | - Wolfgang Liedtke
- Division of Neurology, Department of Medicine, Duke University, Durham, North Carolina 27710
| | - Peter McIntyre
- School of Medical Sciences and Health Innovations Research Institute, RMIT University, Bundoora 3083, Australia
| | - Stephen J Vanner
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, Ontario N7L 3N6, Canada
| | - Christoph Korbmacher
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Nigel W Bunnett
- Monash Institute of Pharmaceutical Sciences, Parkville 3052, Australia,; Department of Pharmacology, University of Melbourne, Melbourne 3010, Australia, and; ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Parkville 3052, Australia.
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14
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Ochoa-Cortes F, Guerrero-Alba R, Valdez-Morales EE, Spreadbury I, Barajas-Lopez C, Castro M, Bertrand J, Cenac N, Vergnolle N, Vanner SJ. Chronic stress mediators act synergistically on colonic nociceptive mouse dorsal root ganglia neurons to increase excitability. Neurogastroenterol Motil 2014; 26:334-45. [PMID: 24286174 DOI: 10.1111/nmo.12268] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 11/01/2013] [Indexed: 12/20/2022]
Abstract
BACKGROUND Stress hormones can signal to colonic dorsal root ganglia (DRG) neurons and may play a role in sustained hyperexcitability of nociceptors. METHODS Mouse DRG neurons were exposed overnight to epinephrine (Epi) 5 nM and/or corticosterone (Cort) 1 μM or prior water-avoidance stress. Patch clamp recordings, visceromotor reflexes (VMRs) and molecular studies were conducted. KEY RESULTS Water-avoidance stress induced neuronal hyperexcitability. Incubation of DRG neurons in both Cort and Epi (but neither alone) induced hyperexcitability (rheobase decreased 51%, p < 0.05; action potential discharge increased 95%, p < 0.01); this was blocked by antagonists of the β2 adrenoreceptor (butoxamine, But) and Cort receptor (mifepristone) in combination or alone. Stress hormones enhanced voltage-gated Nav 1.7 currents (p < 0.05) and suppressed IA (p < 0.0001) and IK+ (p < 0.05) currents. Furthermore, stress hormones increased DRG β2 adrenoreceptor mRNA (59%, p = 0.007) and protein (125%, p < 0.05), also Nav 1.7 transcript (45%, p = 0.004) and protein (114%, p = 0.002). In whole-animal studies, the WAS hyperexcitability of DRG neurons was blocked by antagonists of the β2 and glucocorticoid receptors (GCR) but together they paradoxically increased VMRs to colorectal balloon distension. CONCLUSIONS & INFERENCES Stress mediators Epi and Cort activate β2 and GCR on DRG neurons which synergistically induce hyperexcitability of nociceptive DRG neurons and cause corresponding changes in voltage-gated Na(+) and K(+) currents. Furthermore, they increase the expression of β2 adrenoreceptors and Nav1.7 channels, suggesting transcriptional changes could contribute to sustained signaling following stress. The paradoxical effects of But and mifepristone in electrophysiological compared to VMR testing may reflect different peripheral and central actions on sensory signaling.
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Affiliation(s)
- F Ochoa-Cortes
- Gastrointestinal Diseases Research Unit, Kingston General Hospital, Queen's University School of Medicine, Kingston, ON, Canada
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15
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Valdez-Morales EE, Overington J, Guerrero-Alba R, Ochoa-Cortes F, Ibeakanma CO, Spreadbury I, Bunnett NW, Beyak M, Vanner SJ. Sensitization of peripheral sensory nerves by mediators from colonic biopsies of diarrhea-predominant irritable bowel syndrome patients: a role for PAR2. Am J Gastroenterol 2013; 108:1634-43. [PMID: 23958521 DOI: 10.1038/ajg.2013.241] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 04/16/2013] [Indexed: 12/11/2022]
Abstract
OBJECTIVES This study examined whether mediators from biopsies of human irritable bowel syndrome (IBS) colons alter intrinsic excitability of colonic nociceptive dorsal root ganglion (DRG) neurons by a protease activated receptor 2 (PAR2)-mediated mechanism. METHODS Colonic mucosal biopsies from IBS patients with constipation (IBS-C) or diarrhea (IBS-D) and from healthy controls were incubated in medium, and supernatants were collected. Small-diameter mouse colonic DRG neurons were incubated in supernatants overnight and perforated patch current-clamp recordings obtained. Measurements of rheobase and action potential discharge at twice rheobase were compared between IBS and controls to assess differences in intrinsic excitability. RESULTS Supernatants from IBS-D patients elicited a marked increase in neuronal excitability compared with controls. These changes were consistent among individual patients but the relative contribution of rheobase and action potential discharge varied. In contrast, no differences in neuronal excitability were seen with IBS-C patient supernatants. The increased excitability seen with IBS-D supernatant was not observed in PAR2 knockout mice. A cysteine protease inhibitor, which had no effect on the pronociceptive actions of a serine protease, inhibited the proexcitatory actions of IBS-D supernatant. CONCLUSIONS Soluble mediators from colonic biopsies from IBS-D but not IBS-C patients sensitized colonic nociceptive DRG neurons, suggesting differences between these two groups. PAR2 signaling plays a role in this action and this protease signaling pathway could provide novel biomarkers and therapeutic targets for treatment.
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Affiliation(s)
- Eduardo E Valdez-Morales
- 1] Gastrointestinal Diseases Research Unit, Kingston General Hospital, Kingston, Ontario, Canada [2] The first two authors contributed equally to this work
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16
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Nieto-Pescador MG, Guerrero-Alba R, Valdez-Morales E, Espinosa-Luna R, Jiménez-Vargas N, Liñan-Rico Andrómeda A, Ramos-Lomas TL, Díaz-Hernández Verónica V, Montaño LM, Barajas-López C. P2X4 subunits are part of P2X native channels in murine myenteric neurons. Eur J Pharmacol 2013; 709:93-102. [PMID: 23567069 DOI: 10.1016/j.ejphar.2013.03.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 03/27/2013] [Accepted: 03/28/2013] [Indexed: 02/06/2023]
Abstract
The aim of the present study was to investigate if P2X4 receptors are expressed in murine myenteric neurons and if these receptors contribute to form functional channels in the neuronal membrane by using molecular and electrophysiological techniques. The whole-cell recording technique was used to measure membrane currents induced by ATP (I(ATP)) in myenteric neurons. Compared with recombinant P2X4 receptor-channels (reported by others in a previous study), native myenteric P2X receptors have a relative lower sensitivity for ATP (EC₅₀=102 µM) and α,β methylene ATP (not effect at 30 or 100 µM). BzATP was a weak agonist for native P2X receptors. KN-62 had no effect on myenteric P2X channels whereas PPADS (IC₅₀=0.54 µM) or suramin (IC₅₀=134 µM) were more potent antagonists than on P2X4 homomeric channels. I(ATP) were potentiated by ivermectin (effect that is specific on P2X4 receptors) and zinc. Western blotting shows the presence of P2X4 protein and RT-PCR the corresponding mRNA transcript in the small intestine. Immunoreactivity for P2X4 receptors was found in most myenteric neurons in culture. Single-cell RT-PCR shows the presence of P2X4 mRNA in 90% of myenteric neurons. Our results indicate that P2X4 receptors are expressed in the majority of myenteric neurons, contribute to the membrane currents activated by ATP, and because most properties of I(ATP) does not correspond to P2X4 homomeric channels it is proposed that P2X4 are forming heteromeric channels in these neurons. P2X4 subunits have a widespread distribution within the myenteric plexus and would be expected to play an important role in cell signaling.
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Affiliation(s)
- María G Nieto-Pescador
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, SLP 78216, Mexico
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17
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Alemi F, Kwon E, Poole DP, Lieu T, Lyo V, Cattaruzza F, Cevikbas F, Steinhoff M, Nassini R, Materazzi S, Guerrero-Alba R, Valdez-Morales E, Cottrell GS, Schoonjans K, Geppetti P, Vanner SJ, Bunnett NW, Corvera CU. The TGR5 receptor mediates bile acid-induced itch and analgesia. J Clin Invest 2013; 123:1513-30. [PMID: 23524965 DOI: 10.1172/jci64551] [Citation(s) in RCA: 263] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 01/17/2013] [Indexed: 12/23/2022] Open
Abstract
Patients with cholestatic disease exhibit pruritus and analgesia, but the mechanisms underlying these symptoms are unknown. We report that bile acids, which are elevated in the circulation and tissues during cholestasis, cause itch and analgesia by activating the GPCR TGR5. TGR5 was detected in peptidergic neurons of mouse dorsal root ganglia and spinal cord that transmit itch and pain, and in dermal macrophages that contain opioids. Bile acids and a TGR5-selective agonist induced hyperexcitability of dorsal root ganglia neurons and stimulated the release of the itch and analgesia transmitters gastrin-releasing peptide and leucine-enkephalin. Intradermal injection of bile acids and a TGR5-selective agonist stimulated scratching behavior by gastrin-releasing peptide- and opioid-dependent mechanisms in mice. Scratching was attenuated in Tgr5-KO mice but exacerbated in Tgr5-Tg mice (overexpressing mouse TGR5), which exhibited spontaneous pruritus. Intraplantar and intrathecal injection of bile acids caused analgesia to mechanical stimulation of the paw by an opioid-dependent mechanism. Both peripheral and central mechanisms of analgesia were absent from Tgr5-KO mice. Thus, bile acids activate TGR5 on sensory nerves, stimulating the release of neuropeptides in the spinal cord that transmit itch and analgesia. These mechanisms could contribute to pruritus and painless jaundice that occur during cholestatic liver diseases.
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Affiliation(s)
- Farzad Alemi
- Department of Surgery, UCSF, San Francisco, California 94121, USA
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Ramírez-Martínez JF, González-Chávez R, Guerrero-Alba R, Reyes-Gutiérrez PE, Martínez R, Miranda-Morales M, Espinosa-Luna R, González-Chávez MM, Barajas-López C. Dibenzo[1,2,5]thiadiazepines are non-competitive GABAA receptor antagonists. Molecules 2013; 18:894-913. [PMID: 23344200 PMCID: PMC6270094 DOI: 10.3390/molecules18010894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 12/31/2012] [Accepted: 01/05/2013] [Indexed: 12/25/2022] Open
Abstract
A new process for obtaining dibenzo[c,f][1,2,5]thiadiazepines (DBTDs) and their effects on GABA(A) receptors of guinea pig myenteric neurons are described. Synthesis of DBTD derivatives began with two commercial aromatic compounds. An azide group was obtained after two sequential reactions, and the central ring was closed via a nitrene to obtain the tricyclic sulfonamides (DBTDs). Whole-cell recordings showed that DBTDs application did not affect the holding current but inhibited the currents induced by GABA (I(GABA)), which are mediated by GABA(A) receptors. These DBTDs effects reached their maximum 3 min after application and were: (i) reversible, (ii) concentration-dependent (with a rank order of potency of 2c = 2d > 2b), (iii) mediated by a non-competitive antagonism, and (iv) only observed when applied extracellularly. Picrotoxin (which binds in the channel mouth) and DBTDs effects were not modified when both substances were simultaneous applied. Our results indicate that DBTD acted on the extracellular domain of GABA(A) channels but independent of the picrotoxin, benzodiazepine, and GABA binding sites. DBTDs used here could be the initial model for synthesizing new GABA(A) receptor inhibitors with a potential to be used as antidotes for positive modulators of these receptors or to induce experimental epilepsy.
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Affiliation(s)
- Juan F. Ramírez-Martínez
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí 78216, Mexico; E-Mails: (J.F.R.-M.); (R.G.-A.); (R.E.-L.)
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico; E-Mails: (R.G.-C.); (P.E.R.-G.)
| | - Rodolfo González-Chávez
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico; E-Mails: (R.G.-C.); (P.E.R.-G.)
| | - Raquel Guerrero-Alba
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí 78216, Mexico; E-Mails: (J.F.R.-M.); (R.G.-A.); (R.E.-L.)
| | - Paul E. Reyes-Gutiérrez
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico; E-Mails: (R.G.-C.); (P.E.R.-G.)
| | - Roberto Martínez
- Instituto de Química, Universidad Nacional Autónoma de México, Coyoacán 04510, Mexico; E-Mail:
| | - Marcela Miranda-Morales
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro 76230, Mexico; E-Mail:
| | - Rosa Espinosa-Luna
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí 78216, Mexico; E-Mails: (J.F.R.-M.); (R.G.-A.); (R.E.-L.)
| | - Marco M. González-Chávez
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico; E-Mails: (R.G.-C.); (P.E.R.-G.)
- Authors to whom correspondence should be addressed; E-Mails: (M.M.G.-C.); (C.B.-L.); Tel.: +52-444-826-2440 (ext. 526) (M.M.G.-C.); Tel.: +52-444-834-2035 (C.B.-L.); Fax: +52-444-834-2010 (C.B.-L.)
| | - Carlos Barajas-López
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí 78216, Mexico; E-Mails: (J.F.R.-M.); (R.G.-A.); (R.E.-L.)
- Authors to whom correspondence should be addressed; E-Mails: (M.M.G.-C.); (C.B.-L.); Tel.: +52-444-826-2440 (ext. 526) (M.M.G.-C.); Tel.: +52-444-834-2035 (C.B.-L.); Fax: +52-444-834-2010 (C.B.-L.)
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Valdez-Morales E, Guerrero-Alba R, Ochoa-Cortes F, Benson J, Spreadbury I, Hurlbut D, Miranda-Morales M, Lomax AE, Vanner S. Release of endogenous opioids during a chronic IBD model suppresses the excitability of colonic DRG neurons. Neurogastroenterol Motil 2013; 25:39-46.e4. [PMID: 22963585 DOI: 10.1111/nmo.12008] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Endogenous opioids are implicated in pain-regulation in chronic inflammatory bowel disease (IBD). We sought to examine whether endogenous opioids suppress the excitability of colonic nociceptive dorsal root ganglia (DRG) neurons during chronic IBD, and if so, whether modulation of underlying voltage-gated K(+) currents was involved. METHODS The effects of chronic dextran sulfate sodium (DSS) colitis on afferent signaling in mice was studied using patch clamp recordings. Colonic DRG neurons were identified using Fast Blue retrograde labeling and recordings obtained from small DRG neurons (<40 pF). KEY RESULTS In current-clamp recordings, the rheobase of neurons was increased 47% (P < 0.01) and action potential discharge at twice rheobase decreased 23% (P < 0.05) following incubation in colonic supernatants from chronic DSS mice. β-endorphin increased 14-fold, and tissue opioid immunoreactivity and expression in CD4+ cells observed by flow cytometry increased in chronic DSS colons. Incubation of naïve neurons in the μ-opioid receptor agonist D-Ala(2), N- MePhe(4), Gly-ol (DAMGO) (10 nM) partially recapitulated the effects of supernatants from DSS mice on rheobase. Supernatant effects were blocked by the μ-opioid receptor antagonist naloxone. In voltage clamp, chronic DSS supernatants and DAMGO increased I(A) K(+) currents. CONCLUSIONS & INFERENCES The release of endogenous opioids during chronic inflammation in mice suppresses the excitability of nociceptive DRG neurons. Targeting immune cells may provide a novel means of modulating IBD pain.
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Affiliation(s)
- E Valdez-Morales
- Gastrointestinal Diseases Research Unit, Queen's University, Kingston, ON, Canada
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Valdez-Morales E, Guerrero-Alba R, Liñán-Rico A, Espinosa-Luna R, Zarazua-Guzman S, Miranda-Morales M, Montaño LM, Barajas-López C. P2X7 receptors contribute to the currents induced by ATP in guinea pig intestinal myenteric neurons. Eur J Pharmacol 2011; 668:366-72. [PMID: 21819977 DOI: 10.1016/j.ejphar.2011.07.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 06/29/2011] [Accepted: 07/14/2011] [Indexed: 10/17/2022]
Abstract
The whole-cell configuration, several pharmacological tools, and single-cell RT-PCR were used to investigate the contribution of P2X7 subunits to the ATP-induced currents (I(ATP)) in guinea pig myenteric neurons. I(ATP) was recorded in the great majority of tested neurons. ATP concentration-response curve (0.01-10mM) showed two phases, the first mediated by high-sensitive P2X receptors (hsP2X receptors), observed between 0.01-0.3mM and the second mediated by low-sensitive P2X receptors (lsP2X receptors). The calculated EC(50) values of these phases were 38 and 1759 μM, respectively. 2'-3'-O-(4-benzoylbenzoyl)-ATP (BzATP) concentration-response curve was monophasic (0.01-1mM), and less potent (EC(50) 142 μM) than ATP to activate hsP2X receptors. A strong inward rectification was noticed when hsP2X receptors were activated with ATP (0.1mM) and for BzATP-induced currents (0.1mM; I(BzATP)) but a significant lower rectification was noticed when lsP2X receptors were activated (5mM). Brilliant blue G (BBG) at a concentration of 0.3 μM (known to inhibit only P2X7 receptors) reduced I(ATP) when lsP2X receptors contributed to it but neither affect hsP2X receptors nor I(BzATP). However, hsP2X receptors and I(BzATP) were both inhibited by concentrations ≥ 1 μM of this antagonist. BzATP inhibited hsP2X receptors and therefore, it behaves as partial agonist on these receptors. Using the single-cell RT-PCR technique P2X7 mRNA was detectable in 7 out of 13 myenteric neurons exhibiting P2X2 mRNA. Altogether, our results show that low-sensitive P2X receptors are likely P2X7, whereas, the high-sensitive P2X channels are probably constituted, at least in part, by P2X2 subunits.
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Affiliation(s)
- Eduardo Valdez-Morales
- División de Biología Molecular, Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, SLP, México
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