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Hong MK, Echanique KA, Hoffman LF, Kita AE. Designing a Prolonged Method of Therapeutic Delivery to Support Rehabilitation From Ototoxic Damage in a Schwann Cell Model. Otol Neurotol 2023; 44:373-381. [PMID: 36791364 PMCID: PMC10038897 DOI: 10.1097/mao.0000000000003839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
HYPOTHESIS The ototoxicity of gentamicin and cisplatin can be evaluated with a Schwann cell model to screen for otoprotective agents that can be encapsulated into poly (lactic-co-glycolic acid) (PLGA) microparticles for drug delivery to the inner ear. BACKGROUND Aminoglycosides and cisplatin are widely prescribed but known to cause ototoxicity. There is strong evidence that compromise to Schwann cells ensheathing inner ear afferent neurons results in inner ear dysfunction mimicking drug-induced ototoxicity. There is a need for a model for ototoxic demyelination to screen medications for protective potential and to subsequently target and tune the delivery of any promising agents. METHODS RT4-D6P2T rat schwannoma cells were used as a Schwann cell model to assess gentamicin and cisplatin toxicity and to screen for protective agents. Cell viability was evaluated with the MTT cell proliferation assay. N -acetylcysteine (NAC) was encapsulated into a PLGA microparticle, and its elution profile was determined. RESULTS The estimated 50% lethal concentration dose for gentamicin was 805.6 μM, which was 46-fold higher than that for cisplatin (17.5 μM). In several trials, cells dosed with NAC and cisplatin demonstrated a 22.6% ( p < 0.001) increase in cell viability when compared with cisplatin alone. However, this protective effect was not consistent across all trials. NAC was encapsulated into a PLGA microparticle and elution plateaued at 5 days. CONCLUSION When dosed at their respective therapeutic ranges, cisplatin is more likely than gentamicin to induce damage to the Schwann cell model. Although NAC demonstrates an uncertain role in protecting against cisplatin-induced Schwann cell cytotoxicity, this study establishes a method to screen for other otoprotective medications to encapsulate into a tunable microparticle for localized drug delivery.
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Affiliation(s)
- Michelle K Hong
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California
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Valentino C, Vigani B, Zucca G, Ruggeri M, Marrubini G, Boselli C, Icaro Cornaglia A, Sandri G, Rossi S. Design of Novel Mechanically Resistant and Biodegradable Multichannel Platforms for the Treatment of Peripheral Nerve Injuries. Biomacromolecules 2023; 24:1731-1743. [PMID: 36922716 PMCID: PMC10091422 DOI: 10.1021/acs.biomac.2c01498] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
Peripheral nerve injury is one of the most debilitating pathologies that severely impair patients' life. Although many efforts have been made to advance in the treatment of such a complex disorder, successful strategies to ensure full recovery are still scarce. The aim of the present work was to develop flexible and mechanically resistant platforms intended to act as a support and guide for neural cells during the regeneration process of peripheral nerve injury. For this purpose, poly(lactic-co-glycolic acid) (PLGA)/poly(d,l-lactic acid) (PDLLA)/poly(ethylene glycol) 400 (PEG)-multichannel-based scaffolds (MCs) were prepared through a multistep process involving electrospun microfibers coated with a polymer blend solution and used as a sacrificial mold. In particular, scaffolds characterized by random (MCR) and aligned (MCA) multichannel were obtained. A design of experiments approach (DoE) was employed to identify a scaffold-optimized composition. MCs were characterized for morphological and mechanical properties, suturability, degradability, cell colonization, and in vivo safety. A new biodegradable, biocompatible, and safe microscale multichannel scaffold was developed as the result of an easy multistep procedure.
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Affiliation(s)
- Caterina Valentino
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Barbara Vigani
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Gaia Zucca
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Marco Ruggeri
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Giorgio Marrubini
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Cinzia Boselli
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Antonia Icaro Cornaglia
- Department of Public Health, Experimental, and Forensic Medicine, University of Pavia, Via Forlanini 2, 27100 Pavia, Italy
| | - Giuseppina Sandri
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
| | - Silvia Rossi
- Department of Drug Sciences, University of Pavia, Viale Taramelli, 12, 27100 Pavia, Italy
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Karkas A, Berger F, Péoc'h JM, Cosmo P, Bouamrani A, Dumollard JM. Proteomic Imaging of Vestibular Schwannomas and Normal Nerves. Histopathologic Correlations. Otol Neurotol 2021; 42:1228-1236. [PMID: 33973953 DOI: 10.1097/mao.0000000000003179] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Proteomic analysis of vestibular schwannoma (VS), non-vestibular schwannoma (NVS), and normal nerve (NN) using mass spectrometry and imaging of matrix assisted laser desorption ionization-time of flight (MALDI-TOF). METHODS Retrospective, qualitative, and descriptive study on VS, NVS, and NN. Samples were provided by our Tumor Bank. They were analyzed histologically then sprayed by acid matrix. The laser beam of MALDI performed desorption-ionization of the sample. A mass spectrogram (MS) was drawn depending on time of flight of ionized peptides, and MALDI-imaging was obtained which is a summation color spectrum depending on sample's peptide content. The slice was reexamined histologically and results compared with MALDI-imaging. RESULTS Fifty schwannomas were sampled, of which 27 exploitable: 22 VS (17 Antoni type A and five type B) and five NVS (all Antoni type B). Eleven NN were analyzed. Among the 22 VS, near-total correlation between MALDI-imaging and pathology was found in two cases (9.1%), partial correlation in four (18.2%), and no correlation in 16 (72.7%); correlations were more frequent in VS of the Antoni type B. MS showed a peptide spike at 2,000 m/z in 7 (31.8%) and 5,000 m/z in 21 (95.5%). Among the five NVS, near-total correlation was found in three cases (60%), partial correlation in one (20%), and no correlation in one (20%). MS showed a peptide spike at 2,000 m/z in two (40%) and 5,000 m/z in all (100%). Among the 11 NN, near-total correlation was found in nine cases (81.8%), partial correlation in one (9.1%), and no correlation in one (9.1%). MS showed no peptide spike at 2,000 or 5,000 m/z. Behind homogeneous areas on histology, there was great heterogeneity on MALDI-imaging and MS, regarding VS and NVS, but not NN. CONCLUSIONS There was a lack of correlation between MALDI-imaging and pathology in VS (except Antoni type B) as compared with NVS and NN. The lack of correlation in VS of the type A as compared with type B VS and NVS could be attributed to the overexpression of degeneration-associated proteins/peptides in VS of the type B as well as NVS that are better correlated with histologic findings. The two peptide spikes detected in schwannoma and not in NN opens up the prospect of tumor biomarkers identifiable by sequencing. The proteomic polymorphism found in VS and NVS was absent on histology which is a new morphologic characteristic of schwannoma. Further studies should be performed in the future to confirm the benefit and usefulness of the MALDI in the analysis of VS and NVS.
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Affiliation(s)
- Alexandre Karkas
- Department of Otolaryngology-Head & Neck Surgery, University Medical Center of Saint-Etienne and Jean Monnet University, Saint-Etienne
- Clinatec Platform of CEA-LETI Laboratory
| | - François Berger
- Clinatec Platform of CEA-LETI Laboratory
- BrainTech Laboratory Inserm U1205 and University Medical Center of Grenoble
| | - Jean-Michel Péoc'h
- Department of Pathology, Cytology, and Tumor Banking (CRB42-TTK), University Medical Center of Saint-Etienne and Jean Monnet University, Saint-Etienne
| | - Philippe Cosmo
- Department of Pathology, Cytology, and Tumor Banking (CRB42-TTK), University Medical Center of Saint-Etienne and Jean Monnet University, Saint-Etienne
| | - Ali Bouamrani
- Clinatec Platform of CEA-LETI Laboratory
- Medicalps Laboratory, Grenoble, France
| | - Jean-Marc Dumollard
- Department of Pathology, Cytology, and Tumor Banking (CRB42-TTK), University Medical Center of Saint-Etienne and Jean Monnet University, Saint-Etienne
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Fernandez-Encinas A, García-Peiró A, del Rey J, Ribas-Maynou J, Abad C, Amengual MJ, Prada E, Navarro J, Benet J. Proteomic Analysis in Seminal Plasma of Fertile Donors and Infertile Patients with Sperm DNA Fragmentation. Int J Mol Sci 2020; 21:ijms21145046. [PMID: 32708913 PMCID: PMC7404047 DOI: 10.3390/ijms21145046] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 07/13/2020] [Accepted: 07/15/2020] [Indexed: 02/06/2023] Open
Abstract
Seminal plasma proteomics studies could represent a new approach for the determination of molecular elements driving male infertility, resulting in a better male infertility characterization. The aim of this study is to investigate proteomic differences in seminal plasma samples from fertile and infertile individuals. For that, semen samples were selected according to semen analysis, clinical pathology, and values of sperm DNA fragmentation (alkaline and neutral Comet assay and Sperm Chromatin Dispersion test). A total of 24 seminal plasma samples classified in four groups were processed: fertile donors (FD), recurrent miscarriage patients (RM), asthenoteratozoospermic patients (ATZ), and asthenoteratozoospermic patients with varicocele (ATZ-VAR). Results obtained by 2D-differential gel electrophoresis (2D-DIGE) revealed 26 spots significantly increased in fertile donors when compared to patient groups. Also, eight spots in the ATZ group and two in the ATZ-VAR group were decreased compared to the other groups. Twenty-eight proteins were identified by mass spectrometry (MS), most of them involved in metabolic and cellular processes and with a catalytic or binding function. Protein-protein interactions through Search Tool for the Retrieval of Interacting Genes/Proteins (STRING) tool suggest that a large part of them were associated with each other. Furthermore, most of them were associated with ubiquitin C, indicating that it could play an important regulation role, resulting in a potential male infertility biomarker.
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Affiliation(s)
- Alba Fernandez-Encinas
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; (A.F.-E.); (J.d.R.); (J.R.-M.); (J.N.)
| | - Agustín García-Peiró
- Centro de Infertilidad Masculina y Análisis de Barcelona (CIMAB), 08192 Sant Quirze del Vallès, Spain;
| | - Javier del Rey
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; (A.F.-E.); (J.d.R.); (J.R.-M.); (J.N.)
| | - Jordi Ribas-Maynou
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; (A.F.-E.); (J.d.R.); (J.R.-M.); (J.N.)
| | - Carlos Abad
- Servei d’Urologia, Corporació Sanitària Parc Taulí, Sabadell, Institut Universitari Parc Taulí—UAB, 08208 Sabadell, Spain;
| | - Maria José Amengual
- UDIAT, Centre Diagnòstic, Corporació Sanitària Parc Taulí, Sabadell, Institut Universitari Parc Taulí—UAB, 08208 Sabadell, Spain;
| | - Elena Prada
- Servei de Ginecologia, Hospital Universitari Mútua de Terrassa, 08221 Terrassa, Spain;
| | - Joaquima Navarro
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; (A.F.-E.); (J.d.R.); (J.R.-M.); (J.N.)
| | - Jordi Benet
- Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; (A.F.-E.); (J.d.R.); (J.R.-M.); (J.N.)
- Correspondence: ; Tel.: +34-935-811-773
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Kurushina OV, Barulin AE. [Lo-back pain and compression-ischemic neuropathies: strategies for diagnosis, therapy and rehabilitation]. Zh Nevrol Psikhiatr Im S S Korsakova 2019; 118:122-127. [PMID: 30499508 DOI: 10.17116/jnevro2018118101122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The article discusses such a common pathology as pain syndrome in the lower back and limbs. A variety of etiological causes, anatomical features leading to the formation of this persistent algic disorder lead to therapeutic failures in clinical practice. The authors consider in detail the most common types of compression-ischemic neuropathy accompanying back pain, suggest diagnostic algorithms and practical recommendations. Results of foreign, Russian and own research are presented.
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Affiliation(s)
- O V Kurushina
- Volgograd State Medical University, Volgograd, Russia
| | - A E Barulin
- Volgograd State Medical University, Volgograd, Russia
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Povedano M, Martínez Y, Tejado A, Arroyo P, Tebe C, Lorenzo JL, Montero J. Observational pilot study of patients with carpal tunnel syndrome treated with Nucleo CMP Forte™. Pain Manag 2018; 9:123-129. [PMID: 30451573 DOI: 10.2217/pmt-2018-0050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM Carpal tunnel syndrome (CTS) is a very common entrapment neuropathy characterized by pain and paresthesia in the territory of the median nerve. Although this syndrome has a considerable impact on the patient's quality of life, its medical treatment is far from optimal. MATERIAL & METHODS We performed an observational study to evaluate Nucleo CMP ForteTM in patients with electromyography-confirmed, mild-moderate CTS. Pain was assessed using a visual analog scale, electromyogram and the SF-36. RESULTS Pain decreased significantly after 6 months. Quality of life improved significantly in the pain dimensions. No significant differences were observed in electromyographic findings. No adverse events were reported. CONCLUSIONS Nucleotides could prove useful for the nonsurgical treatment of CTS. Further studies are necessary to confirm this.
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Affiliation(s)
- M Povedano
- Servicio de Neurología y Neurofisiología, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Y Martínez
- Servicio de Neurología y Neurofisiología, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - A Tejado
- Servicio de Neurología y Neurofisiología, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - P Arroyo
- Servicio de Neurología y Neurofisiología, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - C Tebe
- Unitat de Bioestadística (UBiDi), Institut d'Investigació Biomedica de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain.,Universitat Rovira i Virgili, Reus, Tarragona, Spain
| | - J L Lorenzo
- Scientific Information & Documentation Department (ScIDD), Ferrer International, Barcelona, Spain
| | - J Montero
- Servicio de Neurología y Neurofisiología, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
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Palomo-Guerrero M, Cosgaya JM, Gella A, Casals N, Grijota-Martinez C. Uridine-5'-Triphosphate Partially Blocks Differentiation Signals and Favors a more Repair State in Cultured rat Schwann Cells. Neuroscience 2018; 372:255-265. [PMID: 29337237 DOI: 10.1016/j.neuroscience.2018.01.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 12/21/2017] [Accepted: 01/03/2018] [Indexed: 01/05/2023]
Abstract
Schwann cells (SCs) play a key role in peripheral nerve regeneration. After damage, they respond acquiring a repair phenotype that allows them to proliferate, migrate and redirect axonal growth. Previous studies have shown that Uridine-5'-Triphosphate (UTP) and its purinergic receptors participate in several pathophysiological responses in the nervous system. Our group has previously described how UTP induces the migration of a Schwannoma cell line and promotes wound healing. These data suggest that UTP participates in the signaling involved in the regeneration process. In the present study we evaluated UTP effects in isolated rat SCs and cocultures of SCs and dorsal root ganglia neurons. UTP reduced cAMP-dependent Krox-20 induction in SCs. UTP also reduced the N-cadherin re-expression that occurs when SCs and axons make contact. In myelinating cocultures, a non-significant tendency to a lower expression of P0 and MAG proteins in presence of UTP was observed. We also demonstrated that UTP induced SC migration without affecting cell proliferation. Interestingly, UTP was found to block neuregulin-induced phosphorylation of the ErbB3 receptor, a pathway involved in the regeneration process. These results indicate that UTP could acts as a brake to the differentiation signals, promoting a more migratory state in the repair-SCs.
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Affiliation(s)
- Marta Palomo-Guerrero
- Department of Basic Sciences, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain.
| | - Jose Miguel Cosgaya
- Department of Endocrine and Nervous System Pathophysiology, Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain.
| | - Alejandro Gella
- Instituto de Neurociencias, Departamento de Biología Celular, Fisiología e Inmunología, Facultad de Biociencias, Universitat Autònoma de Barcelona, Bellaterra, Spain.
| | - Núria Casals
- Department of Basic Sciences, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain; Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain.
| | - Carmen Grijota-Martinez
- Department of Basic Sciences, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain.
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Anti-proliferative Effects of Nucleotides on Gastric Cancer via a Novel P2Y6/SOCE/Ca 2+/β-catenin Pathway. Sci Rep 2017; 7:2459. [PMID: 28550303 PMCID: PMC5446419 DOI: 10.1038/s41598-017-02562-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 04/13/2017] [Indexed: 12/19/2022] Open
Abstract
Although purinegic signaling is important in regulating gastric physiological functions, it is currently unknown for its role in gastric cancer (GC). We demonstrate for the first time that the expression of P2Y6 receptors was markedly down-regulated in human GC cells and primary GC tissues compared to normal tissues, while the expression of P2Y2 and P2Y4 receptors was up-regulated in GC cells. Moreover, the expression levels of P2Y6 receptors in GC tissues were correlated to tumor size, differentiation, metastasis to lymph nodes, and the survival rate of the patients with GC. Ncleotides activated P2Y6 receptors to raise cytosolic Ca2+ concentrations in GC cells through store-operated calcium entry (SOCE), and then mediated Ca2+-dependent inhibition of β-catenin and proliferation, eventually leading to GC suppression. Furthermore, UTP particularly blocked the G1/S transition of GC cells but did not induce apoptosis. Collectively, we conclude that nucleotides activate P2Y6 receptors to suppress GC growth through a novel SOCE/Ca2+/β-catenin-mediated anti-proliferation of GC cells, which is different from the canonical SOCE/Ca2+-induced apoptosis in other tumors.
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9
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Negrão L, Nunes P. Uridine monophosphate, folic acid and vitamin B12 in patients with symptomatic peripheral entrapment neuropathies. Pain Manag 2015; 6:25-9. [PMID: 26679082 DOI: 10.2217/pmt.15.60] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Carpal tunnel syndrome is the most common type of peripheral entrapment neuropathy. PATIENTS & METHODS We performed an exploratory, open-label, multicenter, observational study of 48 patients with peripheral entrapment neuropathy. Patients received a daily capsule of uridine monophosphate, folic acid + vitamin B12 for 2 months and were evaluated using the Pain DETECT questionnaire. RESULTS The global score for pain decreased from 17.3 ± 5.9 at baseline to 10.3 ± 6.1 at the final evaluation (p < 0.001). Concomitant analgesic and anti-inflammatory treatment was stopped or the dose reduced in 77.4% of patients. CONCLUSION Uridine monophosphate + folic acid + vitamin B12 reduced total pain score, intensity and characterization of pain and associated symptoms. These results should be tested in a well-designed, adequately powered randomized controlled trial.
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Affiliation(s)
- Luis Negrão
- Neuromuscular Diseases Unit, Neurology Service, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
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10
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Lamarca A, Gella A, Martiañez T, Segura M, Figueiro-Silva J, Grijota-Martinez C, Trullas R, Casals N. Uridine 5'-triphosphate promotes in vitro Schwannoma cell migration through matrix metalloproteinase-2 activation. PLoS One 2014; 9:e98998. [PMID: 24905332 PMCID: PMC4048211 DOI: 10.1371/journal.pone.0098998] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 05/09/2014] [Indexed: 02/07/2023] Open
Abstract
In response to peripheral nerve injury, Schwann cells adopt a migratory phenotype and modify the extracellular matrix to make it permissive for cell migration and axonal re-growth. Uridine 5′-triphosphate (UTP) and other nucleotides are released during nerve injury and activate purinergic receptors expressed on the Schwann cell surface, but little is known about the involvement of purine signalling in wound healing. We studied the effect of UTP on Schwannoma cell migration and wound closure and the intracellular signaling pathways involved. We found that UTP treatment induced Schwannoma cell migration through activation of P2Y2 receptors and through the increase of extracellular matrix metalloproteinase-2 (MMP-2) activation and expression. Knockdown P2Y2 receptor or MMP-2 expression greatly reduced wound closure and MMP-2 activation induced by UTP. MMP-2 activation evoked by injury or UTP was also mediated by phosphorylation of all 3 major mitogen-activated protein kinases (MAPKs): JNK, ERK1/2, and p38. Inhibition of these MAPK pathways decreased both MMP-2 activation and cell migration. Interestingly, MAPK phosphorylation evoked by UTP exhibited a biphasic pattern, with an early transient phosphorylation 5 min after treatment, and a late and sustained phosphorylation that appeared at 6 h and lasted up to 24 h. Inhibition of MMP-2 activity selectively blocked the late, but not the transient, phase of MAPK activation. These results suggest that MMP-2 activation and late MAPK phosphorylation are part of a positive feedback mechanism to maintain the migratory phenotype for wound healing. In conclusion, our findings show that treatment with UTP stimulates in vitro Schwannoma cell migration and wound repair through a MMP-2-dependent mechanism via P2Y2 receptors and MAPK pathway activation.
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Affiliation(s)
- Aloa Lamarca
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
| | - Alejandro Gella
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
- * E-mail:
| | - Tania Martiañez
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
| | - Mònica Segura
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
| | - Joana Figueiro-Silva
- Neurobiology Unit, Institut d′Investigacions Biomèdiques de Barcelona, Consejo Superior de Investigaciones Científicas, Institut d′Investigacions Biomèdiques Pi i Sunyer, Barcelona, Spain
| | - Carmen Grijota-Martinez
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
| | - Ramón Trullas
- Neurobiology Unit, Institut d′Investigacions Biomèdiques de Barcelona, Consejo Superior de Investigaciones Científicas, Institut d′Investigacions Biomèdiques Pi i Sunyer, Barcelona, Spain
| | - Núria Casals
- Department of Basic Sciences, Facultat de Medicina, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Spain
- Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
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Negrão L, Almeida P, Alcino S, Duro H, Libório T, Melo Silva U, Figueira R, Gonçalves S, Neto Parra L. Effect of the combination of uridine nucleotides, folic acid and vitamin B12 on the clinical expression of peripheral neuropathies. Pain Manag 2014; 4:191-6. [PMID: 24835269 DOI: 10.2217/pmt.14.10] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
AIMS Peripheral neuropathy (PN) is a common condition whose incidence is approximately 8% in elderly persons. Neuropathic pain (NeP) has a significant incidence in the general population and affects more than half of all patients with PN. The pathophysiology of PN is characterized by lesions of myelin-producing Schwann cells in peripheral nerves. Regeneration/protection of the myelin sheath after a nerve lesion is a fundamental element of repair in PN. Nucleotides such as uridine monophosphate (UMP) have proven to be efficacious in treating the cause of the myelin sheath lesion in several experimental and clinical models. Our objective was to evaluate clinical improvement in patients with PN and NeP treated with a combination of UMP+folic acid+vitamin B12 (Keltican). PATIENTS AND METHODS We performed an exploratory, open-label, multicenter, study of 212 patients followed for 2 months. Pain was assessed using the painDETECT questionnaire (PDQ). RESULTS The intensity of the NeP assessed at the time of the consultation progressed favorably and decreased significantly (p<0.001) in all the types of PN included. The global score for pain assessed using PDQ decreased from 17.5 points to 8.8 points at the final evaluation (p<0.001). Nonsteroidal anti-inflammatory drugs were decreased/withdrawn in 77.4% of patients. CONCLUSIONS The combination of UMP+folic acid+vitamin B12 is effective against NeP associated with PN. It leads to statistically significant reductions not only in the total PDQ score but also in the intensity of pain, number of areas affected, and pain radiation. Furthermore, it makes it possible to reduce the dosage of concomitant medication.
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Affiliation(s)
- Luis Negrão
- Service of Neurology. Hospital Universitario. Ladeira da Porteladinha, No. 46, 3030-203 Coimbra, Portugal
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Martiáñez T, Lamarca A, Casals N, Gella A. N-cadherin expression is regulated by UTP in schwannoma cells. Purinergic Signal 2012; 9:259-70. [PMID: 23271561 DOI: 10.1007/s11302-012-9348-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 12/12/2012] [Indexed: 12/21/2022] Open
Abstract
Schwann cells (SCs) are peripheral myelinating glial cells that express the neuronal Ca(2+)-dependent cell adhesion molecule, neural cadherin (N-cadherin). N-cadherin is involved in glia-glia and axon-glia interactions and participates in many key events, which range from the control of axonal growth and guidance to synapse formation and plasticity. Extracellular UTP activates P2Y purinergic receptors and exerts short- and long-term effects on several tissues to promote wound healing. Nevertheless, the contribution of P2Y receptors in peripheral nervous system functions is not completely understood. The current study demonstrated that UTP induced a dose- and time-dependent increase in N-cadherin expression in SCs. Furthermore, N-cadherin expression was blocked by the P2 purinoceptor antagonist suramin. The increased N-cadherin expression induced by UTP was mediated by phosphorylation of mitogen-activated protein kinases (MAPKs), such as Jun N-terminal kinase, extracellular-regulated kinase and p38 kinase. Moreover, the Rho kinase inhibitor Y27632, the phospholipase C inhibitor U73122 and the protein kinase C inhibitor calphostin C attenuated the UTP-induced activation of MAPKs significantly. Extracellular UTP also modulated increased in the expression of the early transcription factors c-Fos and c-Jun. We also demonstrated that the region of the N-cadherin promoter between nucleotide positions -3698 and -2620, which contained one activator protein-1-binding site, was necessary for UTP-induced gene expression. These results suggest a novel role for P2Y purinergic receptors in the regulation of N-cadherin expression in SCs.
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Affiliation(s)
- Tania Martiáñez
- Basic Sciences Department, Faculty of Medicine and Health Sciences, Universitat International de Catalunya, Sant Cugat del Vallès, Spain
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