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Pinto MV, França MC, Gonçalves MVM, Machado-Costa MC, Freitas MRGD, Gondim FDAA, Marrone CD, Martinez ARM, Moreira CL, Nascimento OJM, Covaleski APP, Oliveira ASBD, Pupe CCB, Rodrigues MMJ, Rotta FT, Scola RH, Marques W, Waddington-Cruz M. Brazilian consensus for diagnosis, management and treatment of hereditary transthyretin amyloidosis with peripheral neuropathy: second edition. Arq Neuropsiquiatr 2023; 81:308-321. [PMID: 37059440 PMCID: PMC10104762 DOI: 10.1055/s-0043-1764412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Hereditary transthyretin amyloidosis with peripheral neuropathy (ATTRv-PN) is an autosomal dominant inherited sensorimotor and autonomic polyneuropathy with over 130 pathogenic variants identified in the TTR gene. Hereditary transthyretin amyloidosis with peripheral neuropathy is a disabling, progressive and life-threatening genetic condition that leads to death in ∼ 10 years if untreated. The prospects for ATTRv-PN have changed in the last decades, as it has become a treatable neuropathy. In addition to liver transplantation, initiated in 1990, there are now at least 3 drugs approved in many countries, including Brazil, and many more are being developed. The first Brazilian consensus on ATTRv-PN was held in the city of Fortaleza, Brazil, in June 2017. Given the new advances in the area over the last 5 years, the Peripheral Neuropathy Scientific Department of the Brazilian Academy of Neurology organized a second edition of the consensus. Each panelist was responsible for reviewing the literature and updating a section of the previous paper. Thereafter, the 18 panelists got together virtually after careful review of the draft, discussed each section of the text, and reached a consensus for the final version of the manuscript.
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Affiliation(s)
- Marcus Vinicius Pinto
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brazil
- Mayo Clinic, Department of Neurology, Rochester, Minnesota, United States
| | | | | | | | - Marcos Raimundo Gomes de Freitas
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brazil
| | | | - Carlo Domenico Marrone
- Pontifícia Universidade Católica do Rio Grande do Sul, Hospital São Lucas, Clínica Marrone e Ambulatório de Doenças Neuromusculare, Porto Alegre RS, Brazil
| | | | | | | | | | | | | | | | - Francisco Tellechea Rotta
- Hospital Moinhos de Vento, Porto Alegre RS, Brazil
- Santa Casa de Misericórdia de Porto Alegre, Porto Alegre RS, Brazil
| | | | - Wilson Marques
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Ribeirão Preto SP, Brazil
| | - Márcia Waddington-Cruz
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brazil
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Pinto MV, Pinto LF, Dias M, Rosa RS, Mundayat R, Pedrosa RC, Waddington-Cruz M. Late-onset hereditary ATTR V30M amyloidosis with polyneuropathy: Characterization of Brazilian subjects from the THAOS registry. J Neurol Sci 2019; 403:1-6. [PMID: 31163298 DOI: 10.1016/j.jns.2019.05.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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: 02/06/2019] [Revised: 05/06/2019] [Accepted: 05/27/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Despite growing numbers of patients diagnosed with late-onset hereditary ATTR V30M amyloidosis with polyneuropathy (ATTRv-PN), this condition remains poorly characterized in Brazil. OBJECTIVE Characterize late-onset V30M ATTRv-PN in Brazil. MATERIAL AND METHODS Demographic and clinical data at the time of enrolment for Brazilian subjects with symptomatic V30M ATTRv-PN were extracted from the ongoing, multinational, longitudinal, observational Transthyretin Amyloidosis Outcomes Survey (THAOS; cut-off date: January 30, 2017). Subjects were divided into those with symptom onset at age <50 years (EO-V30M), and at age ≥50 years (LO-V30M). RESULTS A total of 96 Val30Met patients were symptomatic. LO-V30M (n = 25, 26.0%) had a longer time to diagnosis (mean 5.1 vs. 2.8 yrs.; p = 0.006) and less frequently positive family history (40% vs. 95.8%; p < 0.0001) than EO-V30M. Clinically, subjects with LO-V30M had more imbalance (92% vs. 54.9%; p = 0.006), deep sensory loss (100% vs. 80%; p = 0.0178), electrocardiogram abnormalities (88.9% vs. 59.4; p = 0.0241), and interventricular septum hypertrophy (69.2% vs. 0%; p < 0001) and less frequently sensory dissociation (12% vs. 74%; p < 0.0001). Also, LO-V30M tended to have more severe mean Neurologic Composite Score (101 vs. 70 pts.; p = 0.1136). CONCLUSIONS LO-V30M ATTRv-PN is not unusual in Brazil, tending to be more difficult to diagnose and present with a more severe phenotype, with more large nerve fibers and cardiac involvement than EO-V30M. TRIAL REGISTRATION ClinicalTrials.gov: NCT00628745.
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Affiliation(s)
- Marcus Vinicius Pinto
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Department of Neurology, Mayo Clinic, Rochester, MN, USA.
| | - Luiz Felipe Pinto
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Moises Dias
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Renata Santa Rosa
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Roberto Coury Pedrosa
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcia Waddington-Cruz
- National Amyloidosis Referral Center, CEPARM, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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Pinto MV, Barreira AA, Bulle AS, Freitas MRGD, França MC, Gondim FDAA, Marrone CD, Marques W, Nascimento OJM, Rotta FT, Pupe C, Waddington-Cruz M. Brazilian consensus for diagnosis, management and treatment of transthyretin familial amyloid polyneuropathy. Arq Neuropsiquiatr 2019; 76:609-621. [PMID: 30365625 DOI: 10.1590/0004-282x20180094] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 08/30/2018] [Indexed: 11/22/2022]
Abstract
Transthyretin familial amyloid polyneuropathy is an autosomal dominant inherited sensorimotor and autonomic polyneuropathy, which if untreated, leads to death in approximately 10 years. In Brazil, liver transplant and tafamidis are the only disease-modifying treatments available. This review consists of a consensus for the diagnosis, management and treatment for transthyretin familial amyloid polyneuropathy from the Peripheral Neuropathy Scientific Department of the Brazilian Academy of Neurology. The first and last authors produced a draft summarizing the main views on the subject and emailed the text to 10 other specialists. Relevant literature on this subject was reviewed by each participant and used for the individual review of the whole text. Each participant was expected to review the text and send a feedback review by e-mail. Thereafter, the 12 panelists got together at the city of Fortaleza, discussed the controversial points, and reached a consensus for the final text.
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Affiliation(s)
- Marcus Vinicius Pinto
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brasil
| | | | - Acary Souza Bulle
- Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo SP, Brasil
| | - Marcos Raimundo Gomes de Freitas
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brasil
| | | | - Francisco de Assis Aquino Gondim
- Universidade Federal do Ceará, Faculdade de Medicina, Fortaleza CE, Brasil.,Centro Universitário Unichristus, Fortaleza CE, Brasil
| | - Carlo Domenico Marrone
- Clínica Marrone e Ambulatório de Doenças Neuromusculares do Hospital São Lucas da PUCRS, Porto Alegre RS, Brasil
| | - Wilson Marques
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Ribeirão Preto SP, Brasil
| | | | | | - Camila Pupe
- Universidade Federal Fluminense, Niterói RJ, Brasil
| | - Márcia Waddington-Cruz
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello, Rio de Janeiro RJ, Brasil
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Cruz MW, Pinto MV, Pinto LF, Gervais R, Dias M, Perez C, Mundayat R, Ong ML, Pedrosa RC, Foguel D. Baseline disease characteristics in Brazilian patients enrolled in Transthyretin Amyloidosis Outcome Survey (THAOS). Arq Neuropsiquiatr 2019; 77:96-100. [PMID: 30810593 DOI: 10.1590/0004-282x20180156] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/23/2018] [Indexed: 11/22/2022]
Abstract
Transthyretin amyloidosis (ATTR) is characterized by the deposit of mutant or wild-type transthyretin that forms amyloid fibrils, which are extracellularly deposited within tissues and organs. Clinical manifestations of familial amyloid polyneuropathy vary according to the mutation, age at onset and geographical location. This study aimed to describe baseline disease characteristics of Brazilian patients with transthyretin familial amyloid polyneuropathy (ATTR-FAP) enrolled in the Transthyretin Amyloidosis Outcome Survey (THAOS). METHODS The THAOS is an international, noninterventional, longitudinal, observational, web-based registry designed to characterize ATTR. The outcome measures included demographics (age at symptom onset, gender, time from onset of symptoms to diagnosis, family history), genotype, and clinical characteristics (presence of amyloid deposit, frequency of misdiagnosis, presenting symptomatology). The analysis was conducted in a dataset from Brazilian patients (from November 2008 to January 2016). RESULTS One hundred and sixty participants (52.5% male) were included in the analysis. The majority of participants (90.6%) reported a positive family history of ATTR-FAP Median age at symptom onset was 32.5 years. Val30Met mutation was found in 91.9%. Misdiagnosis was observed in 26.6% of symptomatic patients. Over one-third (35.3%) of the misdiagnosed patients experienced a delay of more than one year before receiving a correct diagnosis. At presentation, 79.7% of the patients had motor, 87.5% sensory and 93.8% autonomic symptoms. CONCLUSION ATTR-FAP in Brazil starts early, has a strong family history and the majority has Val30Met mutation. Misdiagnosis is common and the most common presentation is of a sensorimotor and autonomic neuropathy.
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Affiliation(s)
- Márcia Waddington Cruz
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Marcus Vinicius Pinto
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Luiz Felipe Pinto
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Renata Gervais
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Moisés Dias
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Carlos Perez
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | | | | | - Roberto Coury Pedrosa
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
| | - Débora Foguel
- Universidade Federal do Rio de Janeiro, Hospital Universitário Clementino Fraga Filho, Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello
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da Silva MD, de Santa Rosa RG, Gomes CP, Cardoso Berensztejn A, Pinto MV, Pinto LF, Cruz MW. Albumin/creatinine (uACR) and protein/creatinine (uPCR) ratios in spot urine samples can be used to evaluate albuminuria and proteinuria in hereditary transthyretin amyloidosis patients. Amyloid 2019; 26:41-42. [PMID: 31343291 DOI: 10.1080/13506129.2019.1582506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Moisés Dias da Silva
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil.,b Department of Nephrology, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Renata Gervais de Santa Rosa
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil.,b Department of Nephrology, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Carlos Perez Gomes
- b Department of Nephrology, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Amanda Cardoso Berensztejn
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Marcus Vinicius Pinto
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Luiz Felipe Pinto
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Marcia Waddington Cruz
- a Department of Neurology, CEPARM, Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
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Waddington-Cruz M, Pinto MV, Foguel D. Geographic distribution of ATTR cases from CEPARM across the Brazilian territory and their clinical aspects, demographics, ethnical and family background. Amyloid 2019; 26:53-54. [PMID: 31343314 DOI: 10.1080/13506129.2019.1582518] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Márcia Waddington-Cruz
- a Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello (CEPARM), Federal University of Rio de Janeiro , Rio de Janeiro , Brazil
| | - Marcus Vinicius Pinto
- a Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello (CEPARM), Federal University of Rio de Janeiro , Rio de Janeiro , Brazil
| | - Débora Foguel
- a Centro de Estudos em Paramiloidose Antônio Rodrigues de Mello (CEPARM), Federal University of Rio de Janeiro , Rio de Janeiro , Brazil
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Pinto MV, Bon A, Costa VC, Noro F, Lima MA. Marchiafava-Bignami disease in an AIDS patient. Arq Neuropsiquiatr 2015; 74:180. [PMID: 26486496 DOI: 10.1590/0004-282x20150173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 09/14/2015] [Indexed: 11/22/2022]
Affiliation(s)
- Marcus Vinicius Pinto
- Departamento de Neurologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - André Bon
- Departamento de Doenças Infecciosas e Parasitárias, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Valéria Carvalho Costa
- Departamento de Doenças Infecciosas e Parasitárias, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Fábio Noro
- Departamento de Radiologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Marco Antônio Lima
- Departamento de Neurologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Rosa ADC, Pinto MV, Marussi VHR, Silva Canedo NH, Vasconcellos LFR. 55-Year-Old Man with Acute Ascending Paraparesis. Brain Pathol 2015; 25:655-6. [PMID: 26276030 DOI: 10.1111/bpa.12286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Alcidea da C Rosa
- Division of Neurology, Instituto de Neurologia Deolindo Couto, Federal University of Rio de Janeiro, Brazil
| | - Marcus Vinicius Pinto
- Division of Neurology, Hospital Universitário Clementino Fraga Filho, Federal University of Rio de Janeiro, Brazil
| | - Victor Hugo R Marussi
- Division of Neuroradiology, Medimagem, Hospital Beneficência Portuguesa, São Paulo, Brazil
| | - Nathalie H Silva Canedo
- Division of Neuropathology, Department of Pathology, Hospital Universitário Clementino Fraga Filho, Federal University of Rio de Janeiro, Brazil
| | - Luiz Felipe R Vasconcellos
- Division of Neurology, Instituto de Neurologia Deolindo Couto, Federal University of Rio de Janeiro, Brazil
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Pinto MV, Aguiar T, Nogueira R, Dias AC, Rosso AL. Hemichorea in tuberculous meningitis. Arq Neuropsiquiatr 2014; 72:254. [PMID: 24676445 DOI: 10.1590/0004-282x20130230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/08/2013] [Indexed: 06/03/2023]
Affiliation(s)
- Marcus Vinicius Pinto
- Departamento de Neurologia, Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Tiago Aguiar
- Departamento de Neurologia, Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Renata Nogueira
- Departamento de Neurologia, Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Ana Carolina Dias
- Departamento de Neurologia, Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Ana Lúcia Rosso
- Departamento de Neurologia, Hospital Universitario Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Rodrigues JM, Luís AL, Lobato JV, Pinto MV, Faustino A, Hussain NS, Lopes MA, Veloso AP, Freitas M, Geuna S, Santos JD, Maurício AC. Intracellular Ca2+ concentration in the N1E-115 neuronal cell line and its use for peripheric nerve regeneration. ACTA MEDICA PORT 2005; 18:323-8. [PMID: 16611536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Entubulation repair of peripheral nerve injuries has a lengthy history. Several experimental and clinical studies have explored the effectiveness of many biodegradable and non-degradable tubes with or without addition of molecules and cells. The main objective of the present study was to develop an economical and also an easy way for culturing a neural cell line which is capable of growing, differentiating and producing locally nerve growth factors, that are otherwise extremely expensive, inside 90 PLA/10 PLG nerve guides. For this purpose the authors have chosen the N1E-115 cell line, a clone of cells derived from mouse neuroblastoma C-1300 with the perspective of using this differentiated cellular system to cover the inside of 90 PLA/10 PLG nerve guides placed to bridge a nerve gap of 10 mm in the rat sciatic nerve experimental model. The N1E-115 cells proliferate in normal culture medium but undergo neuronal differentiation in response to DMSO. Upon induction of differentiation, proliferation of N1E-115 cells ceases, extensive neurite outgrowth is observed and the membranes become highly excitable. While it is known that Ca2+ serves as an important intracellular signal for cellular various processes, such as growth and differentiation, be toxic to cells and be involved in the triggering of events leading to excitotoxic cell death in neurons. The [Ca2+]i in non-differentiated N1E-115 cells and after distinct periods of differentiation, have been determined by the epifluorescence technique using the Fura-2-AM probe. The results of this quantitative assessment, revealed that N1E-115 cells which undergo neuronal differentiation for 48 hours in the presence of 1.5% DMSO are best qualified to be used to cover the interior of the nerve guides since the [Ca2+]i was not found to be elevated indicating thus that the onset the cell death processes was not occurred.
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Affiliation(s)
- J M Rodrigues
- Centro de Estudos de Ciência Animal, Instituto de Ciências e Tecnologias Agrárias e Agro-Alimentares, Departamento de Clínicas Veterinárias, Universidade do Porto, Portugal
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Rodrigues JM, Luís AL, Lobato JV, Pinto MV, Lopes MA, Freitas M, Geuna S, Santos JD, Maurício AC. Determination of the intracellular Ca2+ concentration in the N1E-115 neuronal cell line in perspective of its use for peripheric nerve regeneration. Biomed Mater Eng 2005; 15:455-65. [PMID: 16308461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Entubulation repair of peripheral nerve injuries has a lengthy history. Several experimental and clinical studies have explored the effectiveness of many biodegradable and non-degradable tubes with or without addition of molecules and cells. The main objective of the present study was to develop an economical and also an easy way for culturing a neural cell line which was capable of growing, differentiating and producing locally nerve growth factors that are otherwise extremely expensive, inside 90 PLA/10 PLG nerve guides. For this purpose the authors have chosen the N1E-115 cell line, a clone of cells derived from mouse neuroblastoma C-1300 with the perspective of using this differentiated cellular system to cover the inside of 90 PLA/10 PLG nerve guides placed to bridge a gap in the rat sciatic nerve experimental model. The N1E-115 cells proliferate in normal culture medium but undergo neuronal differentiation in response to DMSO. Upon induction of differentiation, proliferation of N1E-115 cells ceases, extensive neurite outgrowth is observed and the membranes become highly excitable. While it is known that Ca2+ serves as an important intracellular signal for various cellular processes, such as growth and differentiation. It is also known that can be toxic to cells and is involved in the triggering of events leading to excitotoxic cell death in neurons. The [Ca2+]i in non-differentiated N1E-115 cells and after distinct periods of differentiation, have been determined by the epifluorescence technique using the Fura-2-AM probe. The results of this quantitative assessment revealed that N1E-115 cells which undergo neuronal differentiation for 48 hours in the presence of 1.5% DMSO are best qualified to be used to cover the interior of the nerve guides since the [Ca2+]i was not found to be elevated indicating thus that the onset the cell death processes was not occurred.
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Affiliation(s)
- J M Rodrigues
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências e Tecnologias Agrárias e Agro-Alimentares (ICETA) da Universidade do Porto, Campus Agrário de Vairão, Rua Padre Armando Quintas, 4485-661 Vairão, Portugal
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