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Zamora-Bello I, Martínez A, Beltrán-Parrazal L, Santiago-Roque I, Juárez-Aguilar E, López-Meraz ML. Evaluation of the anticonvulsant and neuroprotective effect of intracerebral administration of growth hormone in rats. Neurologia 2024; 39:1-9. [PMID: 38161069 DOI: 10.1016/j.nrleng.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 03/01/2021] [Indexed: 01/03/2024] Open
Abstract
INTRODUCTION The growth hormone (GH) has been reported as a crucial neuronal survival factor in the hippocampus against insults of diverse nature. Status epilepticus (SE) is a prolonged seizure that produces extensive neuronal cell death. The goal of this study was to evaluate the effect of intracerebroventricular administration of GH on seizure severity and SE-induced hippocampal neurodegeneration. METHODOLOGY Adult male rats were implanted with a guide cannula in the left ventricle and different amounts of GH (70, 120 or 220ng/3μl) were microinjected for 5 days; artificial cerebrospinal fluid was used as the vehicle. Seizures were induced by the lithium-pilocarpine model (3mEq/kg LiCl and 30mg/kg pilocarpine hydrochloride) one day after the last GH administration. Neuronal injury was assessed by Fluoro-Jade B (F-JB) staining. RESULTS Rats injected with 120ng of GH did not had SE after 30mg/kg pilocarpine, they required a higher number of pilocarpine injections to develop SE than the rats pretreated with the vehicle, 70ng or 220ng GH. Prefrontal and parietal cortex EEG recordings confirmed that latency to generalized seizures and SE was also significantly higher in the 120ng group when compared with all the experimental groups. FJ-B positive cells were detected in the hippocampus after SE in all rats, and no significant differences in the number of F-JB cells in the CA1 area and the hilus was observed between experimental groups. CONCLUSION Our results indicate that, although GH has an anticonvulsive effect in the lithium-pilocarpine model of SE, it does not exert hippocampal neuroprotection after SE.
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Affiliation(s)
- I Zamora-Bello
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico
| | - A Martínez
- Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, Calzada México Xochimilco No. 101, Col. San Lorenzo Huipulco, Tlalpan, Ciudad de México C.P. 14370, Mexico
| | - L Beltrán-Parrazal
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico
| | - I Santiago-Roque
- Laboratorio de Neurotoxicología, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Xalapa, Veracruz C.P. 91010, Mexico
| | - E Juárez-Aguilar
- Instituto de Ciencias de la Salud, Universidad Veracruzana, Av. Dr. Luis Castelazo Ayala s/n, Col. Industrial Animas, Xalapa, Veracruz C.P. 91190, Mexico
| | - M L López-Meraz
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico.
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Valadez-Barba V, Juárez-Navarro K, Padilla-Camberos E, Díaz NF, Guerra-Mora JR, Díaz-Martínez NE. Parkinson's disease: an update on preclinical studies of induced pluripotent stem cells. Neurologia 2023; 38:681-694. [PMID: 37858889 DOI: 10.1016/j.nrleng.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 01/01/2021] [Indexed: 10/21/2023] Open
Abstract
Parkinson's disease (PD) is the second most prevalent neurodegenerative disease among adults worldwide. It is characterised by the death of dopaminergic neurons in the substantia nigra pars compacta and, in some cases, presence of intracytoplasmic inclusions of α-synuclein, called Lewy bodies, a pathognomonic sign of the disease. Clinical diagnosis of PD is based on the presence of motor alterations. The treatments currently available have no neuroprotective effect. The exact causes of PD are poorly understood. Therefore, more precise preclinical models have been developed in recent years that use induced pluripotent stem cells (iPSC). In vitro studies can provide new information on PD pathogenesis and may help to identify new therapeutic targets or to develop new drugs.
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Affiliation(s)
- V Valadez-Barba
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, Mexico
| | - K Juárez-Navarro
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, Mexico
| | - E Padilla-Camberos
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, Mexico
| | - N F Díaz
- Departamento de Fisiología y Desarrollo Celular, Instituto Nacional de Perinatología, Ciudad de México, Mexico
| | - J R Guerra-Mora
- Instituto Nacional de Cancerología, Ciudad de México, Mexico
| | - N E Díaz-Martínez
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, Mexico.
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Fernández-Espejo E. Microorganisms associated with increased risk of Parkinson's disease. Neurologia 2023; 38:495-503. [PMID: 35644845 DOI: 10.1016/j.nrleng.2020.08.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/26/2020] [Indexed: 11/25/2022] Open
Abstract
Parkinson's disease (PD) is a neurodegenerative disorder that affects more than 7 million people worldwide. Its aetiology is unknown, although the hypothesis of a genetic susceptibility to environmental agents is accepted. These environmental agents include fungi, bacteria, and viruses. Three microorganisms are directly associated with a significantly increased risk of developing Parkinson's disease: the fungal genus Malassezia, the bacterium Helicobacter pylori, and the hepatitis C virus. If the host is vulnerable due to genetic susceptibility or immune weakness, these microorganisms can access and infect the nervous system, causing chronic neuroinflammation with neurodegeneration. Other microorganisms show an epidemiological association with the disease, including the influenza type A, Japanese encephalitis type B, St Louis, and West Nile viruses. These viruses can affect the nervous system, causing encephalitis, which can result in parkinsonism. This article reviews the role of all these microorganisms in Parkinson's disease.
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Affiliation(s)
- E Fernández-Espejo
- Laboratorio de Neurología Molecular, Universidad de Sevilla, Sevilla, Spain; Red Andaluza de Investigación Clínica y Traslacional en Neurología (Neuro-RECA), Málaga, Spain.
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Ciprés M, Satue M, Melchor I, Gil-Arribas L, Vilades E, Garcia-Martin E. Retinal neurodegeneration in patients with type 2 diabetes mellitus without diabetic retinopathy. Arch Soc Esp Oftalmol (Engl Ed) 2022; 97:205-218. [PMID: 35523467 DOI: 10.1016/j.oftale.2022.02.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 04/06/2021] [Indexed: 06/14/2023]
Abstract
In diabetes mellitus (DM) patients retinal complications were typically considered part of a vascular process. Recent research suggests that retinal degeneration in DM might also be caused by a neuropathy that could precede microvascular alterations. The present work reviews the currently available bibliography about neurodegeneration in patients with type 2 DM (DM2) without diabetic retinopathy (DR). In patients with non-severe, early DM2 without DR and good metabolic control visual function parameters show early abnormalities that precede clinical DR (in which we diagnose with a conventional ophthalmological examination). Using optical coherence tomography (OCT) technology, a reduction in macular and peripapillary thickness has been observed in different studies. Recent researches suggest that systemic complications (especially ischaemia) and a possible microvascular alteration eventually contributes to retinal neurodegeneration, which opens the door to new studies that include new techniques for evaluating the microvascularization of the retinal layers.
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Affiliation(s)
- M Ciprés
- Servicio de Oftalmologia, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain.
| | - M Satue
- Servicio de Oftalmología, Hospital Universitario Miguel Servet, Zaragoza, Grupo de investigación Miguel Servet Oftalmología (GIMSO), Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Universidad de Zaragoza, Zaragoza, Spain
| | - I Melchor
- Departamento de Endocrinología, Hospital Universitario Miguel Servet, Zaragoza, Spain
| | - L Gil-Arribas
- Servicio de Oftalmología, Hospital Universitario Miguel Servet, Zaragoza, Grupo de investigación Miguel Servet Oftalmología (GIMSO), Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Universidad de Zaragoza, Zaragoza, Spain
| | - E Vilades
- Servicio de Oftalmología, Hospital Universitario Miguel Servet, Zaragoza, Grupo de investigación Miguel Servet Oftalmología (GIMSO), Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Universidad de Zaragoza, Zaragoza, Spain
| | - E Garcia-Martin
- Servicio de Oftalmología, Hospital Universitario Miguel Servet, Zaragoza, Grupo de investigación Miguel Servet Oftalmología (GIMSO), Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Universidad de Zaragoza, Zaragoza, Spain
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Garfias S, Tamaya Domínguez B, Toledo Rojas A, Arroyo M, Rodríguez U, Boll C, Sosa AL, Sciutto E, Adalid-Peralta L, Martinez López Y, Fragoso G, Fleury A. Peripheral blood lymphocyte phenotypes in Alzheimer and Parkinson's diseases. Neurologia (Engl Ed) 2022; 37:110-21. [PMID: 35279225 DOI: 10.1016/j.nrleng.2018.10.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 10/16/2018] [Indexed: 12/12/2022] Open
Abstract
INTRODUCTION Neuroinflammation is involved in the pathophysiology of various neurological disorders, in particular Alzheimer disease (AD) and Parkinson's disease (PD). Alterations in the blood-brain barrier may allow peripheral blood lymphocytes to enter the central nervous system; these may participate in disease pathogenesis. OBJECTIVE To evaluate the peripheral blood lymphocyte profiles of patients with AD and PD and their association with the disease and its progression. METHODS The study included 20 patients with AD, 20 with PD, and a group of healthy individuals. Ten of the patients with AD and 12 of those with PD were evaluated a second time 17 to 27 months after the start of the study. Lymphocyte subpopulations and their activation status were determined by flow cytometry. All patients underwent neurological examinations using internationally validated scales. RESULTS Compared to healthy individuals, patients with AD and PD showed significantly higher levels of activated lymphocytes, lymphocytes susceptible to apoptosis, central memory T cells, and regulatory T and B cells. As the diseases progressed, there was a significant decrease in activated cells (CD4+ CD38+ and CD8+ CD38+ in PD and AD, CD4+ CD69+ and CD8+ CD69+ in PD), T cells susceptible to apoptosis, and some regulatory populations (CD19+ CD5+ IL10+ in PD and AD, CD19+ CD5+ IL10+ FoxP3+, CD4+ FoxP3+ CD25+ CD45RO+ in PD). In patients with AD, disease progression was associated with lower percentages of CD4+ CD38+ cells and higher percentages of effector CD4 cells at the beginning of the study. Significant differences were observed between both diseases. CONCLUSIONS This study provides evidence of changes in peripheral blood lymphocyte phenotypes associated with AD and PD and their severity. Considering effective blood-brain communication, our results open new avenues of research into immunomodulation therapies to treat these diseases.
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Garfias S, Tamaya Domínguez B, Toledo Rojas A, Arroyo M, Rodríguez U, Boll C, Sosa AL, Sciutto E, Adalid-Peralta L, Martinez López Y, Fragoso G, Fleury A. Peripheral blood lymphocyte phenotypes in Alzheimer and Parkinson's diseases. Neurologia 2022; 37:110-121. [PMID: 30871733 DOI: 10.1016/j.nrl.2018.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 08/03/2018] [Revised: 10/02/2018] [Accepted: 10/16/2018] [Indexed: 12/18/2022] Open
Abstract
INTRODUCTION Neuroinflammation is involved in the pathophysiology of various neurological disorders, in particular Alzheimer disease (AD) and Parkinson's disease (PD). Alterations in the blood-brain barrier may allow peripheral blood lymphocytes to enter the central nervous system; these may participate in disease pathogenesis. OBJECTIVE To evaluate the peripheral blood lymphocyte profiles of patients with AD and PD and their association with the disease and its progression. METHODS The study included 20 patients with AD, 20 with PD, and a group of healthy individuals. Ten of the patients with AD and 12 of those with PD were evaluated a second time 17 to 27 months after the start of the study. Lymphocyte subpopulations and their activation status were determined by flow cytometry. All patients underwent neurological examinations using internationally validated scales. RESULTS Compared to healthy individuals, patients with AD and PD showed significantly higher levels of activated lymphocytes, lymphocytes susceptible to apoptosis, central memory T cells, and regulatory T and B cells. As the diseases progressed, there was a significant decrease in activated cells (CD4+ CD38+ and CD8+ CD38 + in PD and AD, CD4+ CD69+ and CD8+ CD69+ in PD), T cells susceptible to apoptosis, and some regulatory populations (CD19+ CD5+ IL10+ in PD and AD, CD19+ CD5+ IL10+ FoxP3+, CD4+ FoxP3+ CD25+ CD45RO+ in PD). In patients with AD, disease progression was associated with lower percentages of CD4+ CD38+ cells and higher percentages of effector CD4 cells at the beginning of the study. Significant differences were observed between both diseases. CONCLUSIONS This study provides evidence of changes in peripheral blood lymphocyte phenotypes associated with AD and PD and their severity. Considering effective blood-brain communication, our results open new avenues of research into immunomodulation therapies to treat these diseases.
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Affiliation(s)
- S Garfias
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - B Tamaya Domínguez
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - A Toledo Rojas
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - M Arroyo
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - U Rodríguez
- Clínica de Parkinson, Instituto Nacional de Neurología y Neurocirugía, Secretaría de Salud, Ciudad de México, México
| | - C Boll
- Clínica de Parkinson, Instituto Nacional de Neurología y Neurocirugía, Secretaría de Salud, Ciudad de México, México
| | - A L Sosa
- Clínica de Demencia, Instituto Nacional de Neurología y Neurocirugía, Secretaría de Salud, Ciudad de México, México
| | - E Sciutto
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, UNAM, Ciudad de México, México
| | - L Adalid-Peralta
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - Y Martinez López
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México
| | - G Fragoso
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, UNAM, Ciudad de México, México
| | - A Fleury
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México (UNAM)/Facultad de Medicina-UNAM/Instituto Nacional de Neurología y Neurocirugía, Ciudad de México, México.
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Zamora-Bello I, Martínez A, Beltrán-Parrazal L, Santiago-Roque I, Juárez-Aguilar E, López-Meraz ML. Evaluation of the anticonvulsant and neuroprotective effect of intracerebral administration of growth hormone in rats. Neurologia 2021; 39:S0213-4853(21)00074-8. [PMID: 34030900 DOI: 10.1016/j.nrl.2021.03.010] [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: 11/13/2020] [Revised: 02/21/2021] [Accepted: 03/01/2021] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION The growth hormone (GH) has been reported as a crucial neuronal survival factor in the hippocampus against insults of diverse nature. Status epilepticus (SE) is a prolonged seizure that produces extensive neuronal cell death. The goal of this study was to evaluate the effect of intracerebroventricular administration of GH on seizure severity and SE-induced hippocampal neurodegeneration. METHODOLOGY Adult male rats were implanted with a guide cannula in the left ventricle and different amounts of GH (70, 120 or 220ng/3μl) were microinjected for 5 days; artificial cerebrospinal fluid was used as the vehicle. Seizures were induced by the lithium-pilocarpine model (3mEq/kg LiCl and 30mg/kg pilocarpine hydrochloride) one day after the last GH administration. Neuronal injury was assessed by Fluoro-Jade B (F-JB) staining. RESULTS Rats injected with 120ng of GH did not had SE after 30mg/kg pilocarpine, they required a higher number of pilocarpine injections to develop SE than the rats pretreated with the vehicle, 70ng or 220ng GH. Prefrontal and parietal cortex EEG recordings confirmed that latency to generalized seizures and SE was also significantly higher in the 120ng group when compared with all the experimental groups. FJ-B positive cells were detected in the hippocampus after SE in all rats, and no significant differences in the number of F-JB cells in the CA1 area and the hilus was observed between experimental groups. CONCLUSION Our results indicate that, although GH has an anticonvulsive effect in the lithium-pilocarpine model of SE, it does not exert hippocampal neuroprotection after SE.
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Affiliation(s)
- I Zamora-Bello
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico
| | - A Martínez
- Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, Calzada México Xochimilco No. 101, Col. San Lorenzo Huipulco, Tlalpan, Ciudad de México C.P. 14370, Mexico
| | - L Beltrán-Parrazal
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico
| | - I Santiago-Roque
- Laboratorio de Neurotoxicología, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Xalapa, Veracruz C.P. 91010, Mexico
| | - E Juárez-Aguilar
- Instituto de Ciencias de la Salud, Universidad Veracruzana, Av. Dr. Luis Castelazo Ayala s/n, Col. Industrial Animas, Xalapa, Veracruz C.P. 91190, Mexico
| | - M L López-Meraz
- Centro de Investigaciones Cerebrales, Universidad Veracruzana, Médicos y Odontólogos s/n, Col. Unidad del Bosque Xalapa, Veracruz C.P. 91010, Mexico.
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Valadez-Barba V, Juárez-Navarro K, Padilla-Camberos E, Díaz NF, Guerra-Mora JR, Díaz-Martínez NE. Parkinson's disease: An update on preclinical studies of induced pluripotent stem cells. Neurologia 2021; 38:S0213-4853(21)00020-7. [PMID: 33715888 DOI: 10.1016/j.nrl.2021.01.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 11/08/2020] [Accepted: 01/01/2021] [Indexed: 01/16/2023] Open
Abstract
Parkinson's disease (PD) is the second most prevalent neurodegenerative disease among adults worldwide. It is characterised by the death of dopaminergic neurons in the substantia nigra pars compacta and, in some cases, presence of intracytoplasmic inclusions of α-synuclein, called Lewy bodies, a pathognomonic sign of the disease. Clinical diagnosis of PD is based on the presence of motor alterations. The treatments currently available have no neuroprotective effect. The exact causes of PD are poorly understood. Therefore, more precise preclinical models have been developed in recent years that use induced pluripotent stem cells. In vitro studies can provide new information on PD pathogenesis and may help to identify new therapeutic targets or to develop new drugs.
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Affiliation(s)
- V Valadez-Barba
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, México
| | - K Juárez-Navarro
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, México
| | - E Padilla-Camberos
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, México
| | - N F Díaz
- Departamento de Fisiología y Desarrollo Celular, Instituto Nacional de Perinatología, Ciudad de México, México
| | - J R Guerra-Mora
- Instituto Nacional de Cancerología, Ciudad de México, México
| | - N E Díaz-Martínez
- Biotecnología Medica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, Jalisco, México.
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Fernández-Espejo E. Microorganisms that are related with increased risk for Parkinson's disease. Neurologia 2020; 38:S0213-4853(20)30301-7. [PMID: 33160724 DOI: 10.1016/j.nrl.2020.08.020] [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: 06/03/2020] [Revised: 08/04/2020] [Accepted: 08/26/2020] [Indexed: 11/25/2022] Open
Abstract
Parkinson's disease is a neurodegenerative disorder that affects more than 7 million people worldwide. Its aetiology is unknown, although the hypothesis of a genetic susceptibility to environmental agents is accepted. These environmental agents include fungi, bacteria, and viruses. Three microorganisms are directly associated with a significantly increased risk of developing Parkinson's disease: the fungal genus Malassezia, the bacterium Helicobacter pylori, and the hepatitis C virus. If the host is vulnerable due to genetic susceptibility or immune weakness, these microorganisms can access and infect the nervous system, causing chronic neuroinflammation with neurodegeneration. Other microorganisms show an epidemiological association with the disease, including the influenza type A, Japanese encephalitis type B, St Louis, and West Nile viruses. These viruses can affect the nervous system, causing encephalitis, which can result in parkinsonism. This article reviews the role of all these microorganisms in Parkinson's disease.
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Affiliation(s)
- E Fernández-Espejo
- Laboratorio de Neurología Molecular, Universidad de Sevilla, Sevilla, España; Red Andaluza de Investigación Clínica y Traslacional en Neurología (Neuro-RECA), Málaga, España.
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Allegri RF, Chrem Mendez P, Russo MJ, Cohen G, Calandri I, Campos J, Nahas F, Surace E, Vazquez S, Sevlever G. Biomarkers of Alzheimer's disease in mild cognitive impairment: Experience in a memory clinic from Latin America. Neurologia 2021; 36:201-8. [PMID: 29636288 DOI: 10.1016/j.nrl.2017.12.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 12/17/2017] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE This study aimed to investigate the role and prognosis of Alzheimer disease biomarkers in patients with mild cognitive impairment (MCI) at a memory clinic in Latin America. METHODS We studied 89 patients with MCI, 43 with Alzheimer-type dementia, and 18 healthy controls (matched for age, sex, and educational level) at our memory clinic (Instituto FLENI) in Buenos Aires, Argentina. Patients and controls underwent an extensive demographic, neurological, and neuropsychological assessment. All subjects underwent a brain MRI scan; FDG-PET scan; amyloid PET scan; apolipoprotein E genotyping; and cerebrospinal fluid concentrations of Aβ1-42, tau, and phosphorylated tau. Patients were categorised as positive or negative for the presence of amyloid pathology and neurodegeneration. RESULTS Amyloid pathology was observed in cerebrospinal fluid results in 18% of controls, 64% of patients with MCI, and 92% of patients with Alzheimer-type dementia. Suspected non-Alzheimer disease pathophysiology was found in 11% of controls, 6% of patients with MCI, and 8% of patients with Alzheimer-type dementia. At 30 months of follow-up, 45% of amyloid-positive patients with MCI and 20% of amyloid-negative patients with MCI showed progression to dementia. CONCLUSIONS This study demonstrates biomarker-based MCI prognosis and supports its role in clinical decision-making in daily practice.
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Cota-Coronado JA, Sandoval-Ávila S, Gaytan-Dávila YP, Diaz NF, Vega-Ruiz B, Padilla-Camberos E, Díaz-Martínez NE. New transgenic models of Parkinson's disease using genome editing technology. Neurologia 2017; 35:486-499. [PMID: 29196142 DOI: 10.1016/j.nrl.2017.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 12/19/2016] [Revised: 07/13/2017] [Accepted: 08/15/2017] [Indexed: 01/16/2023] Open
Abstract
INTRODUCTION Parkinson's disease (PD) is the second most common neurodegenerative disorder. It is characterised by selective loss of dopaminergic neurons in the substantia nigra pars compacta, which results in dopamine depletion, leading to a number of motor and non-motor symptoms. DEVELOPMENT In recent years, the development of new animal models using nuclease-based genome-editing technology (ZFN, TALEN, and CRISPR/Cas9 nucleases) has enabled the introduction of custom-made modifications into the genome to replicate key features of PD, leading to significant advances in our understanding of the pathophysiology of the disease. CONCLUSIONS We review the most recent studies on this new generation of in vitro and in vivo PD models, which replicate the most relevant symptoms of the disease and enable better understanding of the aetiology and mechanisms of PD. This may be helpful in the future development of effective treatments to halt or slow disease progression.
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Affiliation(s)
- J A Cota-Coronado
- Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, México
| | - S Sandoval-Ávila
- Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, México
| | - Y P Gaytan-Dávila
- Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, México
| | - N F Diaz
- Departamento de Biología Celular, Instituto Nacional de Perinatología, Ciudad de México, México
| | - B Vega-Ruiz
- Departamento de Neurociencias, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, México
| | - E Padilla-Camberos
- Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, México
| | - N E Díaz-Martínez
- Biotecnología Médica y Farmacéutica, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, Guadalajara, México.
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Borrás Blasco C, Viña Ribes J. [Neurophysiology and ageing. Definition and pathophysiological foundations of cognitive impairment]. Rev Esp Geriatr Gerontol 2017; 51 Suppl 1:3-6. [PMID: 27719970 DOI: 10.1016/s0211-139x(16)30136-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Brain ageing is produced by various morphological, biochemical, metabolic and circulatory changes, which are reflected in functional changes, whose impact depends on the presence or absence of cognitive impairment. Because of brain plasticity, together with redundancy of the distinct cerebral circuits, age- related deterioration of the brain at various levels does not always translate into loss of brain function. However, when the damage exceeds certain thresholds, there is age-related cognitive impairment, which increases the risk of developing various neurodegenerative diseases such as Alzheimer disease. Genetics, together with lifestyle, diet, and environmental factors, etc, can trigger the development of these diseases, which provoke cognitive impairment. This article discusses the most important age-related changes in the brain, as well as the pathophysiological foundations of cognitive impairment.
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Affiliation(s)
- Consuelo Borrás Blasco
- Departamento de Fisiología, Facultad de Medicina, Universidad de Valencia, Valencia, España.
| | - José Viña Ribes
- Departamento de Fisiología, Facultad de Medicina, Universidad de Valencia, Valencia, España
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Solleiro-Villavicencio H, Rivas-Arancibia S. Systemic Th17/IL-17A response appears prior to hippocampal neurodegeneration in rats exposed to low doses of ozone. Neurologia 2017; 34:503-509. [PMID: 28587742 DOI: 10.1016/j.nrl.2017.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 04/03/2017] [Indexed: 01/08/2023] Open
Abstract
INTRODUCTION Exposure to low doses of O3 leads to a state of oxidative stress. Some studies show that oxidative stress can modulate both the CNS and systemic inflammation, which are important factors in the development of Alzheimer disease (AD). OBJECTIVE This study aims to evaluate changes in the frequency of Th17-like cells (CD3+CD4+IL-17A+), the concentration of IL-17A in peripheral blood, and hippocampal immunoreactivity to IL-17A in rats exposed to low doses of O3. METHODS One hundred eight male Wistar rats were randomly assigned to 6 groups (n=18) receiving the following treatments: control (O3 free) or O3 exposure (0.25ppm, 4hours daily) over 7, 15, 30, 60, and 90 days. Twelve animals from each group were decapitated and a peripheral blood sample was taken to isolate plasma and mononuclear cells. Plasma IL-17A was quantified using LUMINEX, while Th17-like cells were counted using flow cytometry. The remaining 6 rats were deeply anaesthetised and underwent transcardial perfusion for immunohistological study of the hippocampus. RESULTS Results show that exposure to O3 over 7 days resulted in a significant increase in the frequency of Th17-like cells and levels of IL-17A in peripheral blood. However, levels of Th17/IL-17A in peripheral blood were lower at day 15 of exposure. We also observed increased IL-17A in the hippocampus beginning at 30 days of exposure. CONCLUSION These results indicate that O3 induces a short-term, systemic Th17-like/IL-17A effect and an increase of IL-17A in the hippocampal tissue during the chronic neurodegenerative process.
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Affiliation(s)
- H Solleiro-Villavicencio
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - S Rivas-Arancibia
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, México.
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Hernandez-Baltazar D, Zavala-Flores LM, Villanueva-Olivo A. The 6-hydroxydopamine model and parkinsonian pathophysiology: Novel findings in an older model. Neurologia 2015; 32:533-539. [PMID: 26304655 DOI: 10.1016/j.nrl.2015.06.011] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [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: 11/27/2014] [Revised: 06/09/2015] [Accepted: 06/15/2015] [Indexed: 01/09/2023] Open
Abstract
The neurotoxin 6-hydroxydopamine (6-OHDA) is widely used to induce models of Parkinson's disease (PD). We now know that the model induced by 6-OHDA does not include all PD symptoms, although it does reproduce the main cellular processes involved in PD, such as oxidative stress, neurodegeneration, neuroinflammation, and neuronal death by apoptosis. In this review we analyse the factors affecting the vulnerability of dopaminergic neurons as well as the close relationships between neuroinflammation, neurodegeneration, and apoptosis in the 6-OHDA model. Knowledge of the mechanisms involved in neurodegeneration and cell death in this model is the key to identifying potential therapeutic targets for PD.
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Affiliation(s)
- D Hernandez-Baltazar
- Cátedra CONACyT, Dirección Adjunta de Desarrollo Científico CONACyT, México, D. F., México; Instituto de Neuroetología, Universidad Veracruzana, Xalapa, Veracruz, México.
| | - L M Zavala-Flores
- Centro de Investigación Biomédica del Noreste, IMSS, Monterrey, Nuevo León, México
| | - A Villanueva-Olivo
- Departamento de Histología, Facultad de Medicina, Universidad Autónoma de Nuevo León, Monterrey, Nuevo León, México
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De La Hoz Polo M, Rebollo Polo M, Fons Estupiña C, Muchart López J, Cruz Martinez O. [Neuroimaging of Langerhans cell histiocytosis in the central nervous system of children]. Radiologia 2014; 57:123-30. [PMID: 24837565 DOI: 10.1016/j.rx.2014.01.003] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2013] [Revised: 01/19/2014] [Accepted: 01/22/2014] [Indexed: 11/19/2022]
Abstract
Langerhans cell histiocytosis (LCH) is a rare disease characterized by the accumulation within tissues of anomalous dendritic cells similar to Langerhans cells. The clinical presentation varies, ranging from the appearance of a single bone lesion to multisystemic involvement. Central nervous system (CNS) involvement, manifesting as diabetes insipidus secondary to pituitary involvement, has been known since the original description of the disease. Two types of CNS lesions are currently differentiated. The first, pseudotumoral lesions with infiltration by Langerhans cells, most commonly manifests as pituitary infiltration. The second, described more recently, consists of neurodegenerative lesions of the CNS associated with neurologic deterioration. This second type of lesion constitutes a complication of the disease; however, there is no consensus about the cause of this complication. Our objective was to describe the radiologic manifestations of LCH in the CNS in pediatric patients.
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Affiliation(s)
- M De La Hoz Polo
- Servicio de Radiodiagnóstico, Hospital Universitario Mútua Terrassa, Terrassa, Barcelona, España; Servicio de Radiología Pediátrica, Hospital San Joan de Déu, Esplugues de Llobregat, Barcelona, España.
| | - M Rebollo Polo
- Servicio de Radiología Pediátrica, Hospital San Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - C Fons Estupiña
- Servicio de Neurología Pediátrica, Hospital San Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - J Muchart López
- Servicio de Radiología Pediátrica, Hospital San Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - O Cruz Martinez
- Servicio de Oncología Pediátrica, Hospital San Joan de Déu, Esplugues de Llobregat, Barcelona, España
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