1
|
Mohammadi M, Tavassoli Z, Anvari S, Javan M, Fathollahi Y. Avoidance and escape conditioning adjust adult neurogenesis to conserve a fit hippocampus in adult male rodents. J Neurosci Res 2024; 102:e25291. [PMID: 38284841 DOI: 10.1002/jnr.25291] [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: 03/28/2023] [Revised: 12/04/2023] [Accepted: 12/13/2023] [Indexed: 01/30/2024]
Abstract
In this study, the connection between cognitive behaviors and the adult rodent hippocampus was investigated. Recording field potentials at performant pathway (PP)-hippocampal dentate gyrus (DG) synapses in transverse slices from the dorsal (d), intermediate (i), and ventral (v) hippocampus showed differences in paired-pulse responses and long-term potentiation in rats. The Barnes maze (BM) and passive avoidance (PA) tests indicated a decrease in escape latency and step-through latency in both rats and mice over training days. A decrease in the use of random or sequential strategy while an increase in the use of direct strategy to search for an escape box occurred in both groups. Evaluation of the levels of neurogenesis markers (Ki67 and BrdU/NeuN) by immunofluorescence assay in the dDG, iDG, and vDG revealed a long-axis disparity in the hippocampal dentate baseline cell proliferation and exposure to the BM and PA task changed the profile of baseline cell proliferation along the DG in both rats and mice. Also, these learning experiences changed the profile of BrdU+ /NeuN+ cells along the DG of rats. Quantitation of hippocampal BDNF protein levels using ELISA exhibited no changes in BDNF levels due to learning experiences in rats. We demonstrate that PP-DG synaptic efficacy and neurogenesis are organized along a gradient. Avoidance and escape conditioning themselves are sufficient to change and calibrate adult neurogenesis along the hippocampal long axis in rodents. Further research will be required to determine the precise mechanisms underlying the role of experience-derived neuroplasticity in cognitive function and decline.
Collapse
Affiliation(s)
- Masoud Mohammadi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Zohreh Tavassoli
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Sohrab Anvari
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mohammad Javan
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Yaghoub Fathollahi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| |
Collapse
|
2
|
López-Cervantes M, Quintanar-Stephano A, Alcauter-Solórzano S, Hernández-Pando R, Aguilar-Roblero R, Gasca-Martínez D, Ortíz JJ, Vázquez-Martínez O, Ximénez-Camilli C, Díaz-Muñoz M. Cerebellar spongiform degeneration is accompanied by metabolic, cellular, and motor disruption in male rats with portacaval anastomosis. J Neurosci Res 2021; 99:2287-2304. [PMID: 34061383 DOI: 10.1002/jnr.24853] [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: 07/03/2020] [Revised: 04/14/2021] [Accepted: 04/22/2021] [Indexed: 12/12/2022]
Abstract
The episodes of cerebral dysfunction, known as encephalopathy, are usually coincident with liver failure. The primary metabolic marker of liver diseases is the increase in blood ammonium, which promotes neuronal damage. In the present project, we used an experimental model of hepatic encephalopathy in male rats by portacaval anastomosis (PCA) surgery. Sham rats had a false operation. After 13 weeks of surgery, the most distinctive finding was vacuolar/spongiform neurodegeneration exclusively in the molecular layer of the cerebellum. This cerebellar damage was further characterized by metabolic, histopathological, and behavioral approaches. The results were as follows: (a) Cellular alterations, namely loss of Purkinje cells, morphological changes, such as swelling of astrocytes and Bergmann glia, and activation of microglia; (b) Cytotoxic edema, shown by an increase in aquaporin-4 and N-acetylaspartate and a reduction in taurine and choline-derivate osmolytes; (c) Metabolic adjustments, noted by the elevation of circulating ammonium, enhanced presence of glutamine synthetase, and increase in glutamine and creatine/phosphocreatine; (d) Inflammasome activation, detected by the elevation of the marker NLRP3 and microglial activation; (e) Locomotor deficits in PCA rats as assessed by the Rotarod and open field tests. These results lead us to suggest that metabolic disturbances associated with PCA can generate the cerebellar damage that is similar to morphophysiological modifications observed in amyloidogenic disorders. In conclusion, we have characterized a distinctive cerebellar multi-disruption accompanied by high levels of ammonium and associated with spongiform neurodegeneration in a model of hepatic hypofunctioning.
Collapse
Affiliation(s)
- Mayra López-Cervantes
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Andrés Quintanar-Stephano
- Departmento de Fisiología y Farmacología, Centro de Ciencia Básica, Universidad Autónoma de Aguascalientes, Aguascalientes, Mexico
| | - Sarael Alcauter-Solórzano
- Laboratorio Nacional de Imagenología por Resonancia Magnética, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Rogelio Hernández-Pando
- Seccion de Patología Experimental, Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán", Ciudad de México, Mexico
| | - Raúl Aguilar-Roblero
- División de Neurociencias, Instituto de Fisiología Celular, UNAM, Ciudad de México, Mexico
| | - Deisy Gasca-Martínez
- Unidad de Análisis Conductual, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Juan J Ortíz
- Laboratorio Nacional de Imagenología por Resonancia Magnética, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Olivia Vázquez-Martínez
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Cecilia Ximénez-Camilli
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| | - Mauricio Díaz-Muñoz
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Campus UNAM-Juriquilla, Querétaro, Mexico
| |
Collapse
|
3
|
Salapa HE, Libner CD, Levin MC. Dysfunctional RNA-binding protein biology and neurodegeneration in experimental autoimmune encephalomyelitis in female mice. J Neurosci Res 2019; 98:704-717. [PMID: 31755578 DOI: 10.1002/jnr.24554] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 08/27/2019] [Revised: 10/04/2019] [Accepted: 10/24/2019] [Indexed: 12/11/2022]
Abstract
Altered stress granule (SG) and RNA-binding protein (RBP) biology have been shown to contribute to the pathogenesis of several neurodegenerative diseases, yet little is known about their role in multiple sclerosis (MS). Pathological features associated with dysfunctional RBPs include RBP mislocalization from its normal nuclear location to the cytoplasm and the formation of chronic SGs. We tested the hypothesis that altered SG and RBP biology might contribute to the neurodegeneration in experimental autoimmune encephalomyelitis (EAE). C57BL/6 female mice were actively immunized with MOG35-55 to induce EAE. Spinal cords were examined for mislocalization of the RBPs, heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) and TAR-DNA binding protein-43 (TDP-43), SGs, neurodegeneration (SMI-32), T cells (CD3), and macrophages (CD68). In contrast to naive mice, mice with EAE showed SG formation (p < 0.0001) and mislocalization of hnRNP A1 (p < 0.05) in neurons of the ventral spinal cord gray matter, which correlated with clinical score (R = 0.8104, p = 0.0253). In these same areas, there was a neuronal loss (p < 0.0001) and increased SMI-32 immunoreactivity (both markers of neurodegeneration) and increased staining for CD3+ T cells and IFN-gamma. These findings recapitulate the SG and RBP biology and markers of neurodegeneration in MS tissues and suggest that altered SG and RBP biology contribute to the neurodegeneration in EAE, which might also apply to the pathogenesis of MS.
Collapse
Affiliation(s)
- Hannah E Salapa
- Department of Anatomy, Physiology and Pharmacology, University of Saskatchewan, Saskatoon, SK, Canada
| | - Cole D Libner
- Department of Health Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Michael C Levin
- Department of Anatomy, Physiology and Pharmacology, University of Saskatchewan, Saskatoon, SK, Canada.,Office of the Saskatchewan Multiple Sclerosis Clinical Research Chair, University of Saskatchewan, Saskatoon, SK, Canada.,College of Medicine, Neurology Division, University of Saskatchewan, Saskatoon, SK, Canada
| |
Collapse
|
4
|
Haney MM, Hamad A, Woldu HG, Ciucci M, Nichols N, Bunyak F, Lever TE. Recurrent laryngeal nerve transection in mice results in translational upper airway dysfunction. J Comp Neurol 2019; 528:574-596. [PMID: 31512255 DOI: 10.1002/cne.24774] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 06/07/2019] [Revised: 08/21/2019] [Accepted: 08/28/2019] [Indexed: 02/06/2023]
Abstract
The recurrent laryngeal nerve (RLN) is responsible for normal vocal-fold (VF) movement, and is at risk for iatrogenic injury during anterior neck surgical procedures in human patients. Injury, resulting in VF paralysis, may contribute to subsequent swallowing, voice, and respiratory dysfunction. Unfortunately, treatment for RLN injury does little to restore physiologic function of the VFs. Thus, we sought to create a mouse model with translational functional outcomes to further investigate RLN regeneration and potential therapeutic interventions. To do so, we performed ventral neck surgery in 21 C57BL/6J male mice, divided into two groups: Unilateral RLN Transection (n = 11) and Sham Injury (n = 10). Mice underwent behavioral assays to determine upper airway function at multiple time points prior to and following surgery. Transoral endoscopy, videofluoroscopy, ultrasonic vocalizations, and whole-body plethysmography were used to assess VF motion, swallow function, vocal function, and respiratory function, respectively. Affected outcome metrics, such as VF motion correlation, intervocalization interval, and peak inspiratory flow were identified to increase the translational potential of this model. Additionally, immunohistochemistry was used to investigate neuronal cell death in the nucleus ambiguus. Results revealed that RLN transection created ipsilateral VF paralysis that did not recover by 13 weeks postsurgery. Furthermore, there was evidence of significant vocal and respiratory dysfunction in the RLN transection group, but not the sham injury group. No significant differences in swallow function or neuronal cell death were found between the two groups. In conclusion, our mouse model of RLN injury provides several novel functional outcome measures to increase the translational potential of findings in preclinical animal studies. We will use this model and behavioral assays to assess various treatment options in future studies.
Collapse
Affiliation(s)
- Megan M Haney
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri
| | - Ali Hamad
- Department of Electrical Engineering and Computer Science, University of Missouri, Columbia, Missouri
| | - Henok G Woldu
- Department of Health Management & Informatics, University of Missouri, Columbia, Missouri
| | - Michelle Ciucci
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, Wisconsin.,Department of Surgery, Division of Otolaryngology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Nicole Nichols
- Department of Biomedical Sciences, University of Missouri, Columbia, Missouri
| | - Filiz Bunyak
- Department of Electrical Engineering and Computer Science, University of Missouri, Columbia, Missouri
| | - Teresa E Lever
- Department of Biomedical Sciences, University of Missouri, Columbia, Missouri.,Department of Otolaryngology-Head and Neck Surgery, University of Missouri, Columbia, Missouri
| |
Collapse
|