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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] [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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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] [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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Treatment with Growth Hormone (GH) Increased the Metabolic Activity of the Brain in an Elder Patient, Not GH-Deficient, Who Suffered Mild Cognitive Alterations and Had an ApoE 4/3 Genotype. Int J Mol Sci 2018; 19:ijms19082294. [PMID: 30081594 PMCID: PMC6121435 DOI: 10.3390/ijms19082294] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/24/2018] [Accepted: 07/31/2018] [Indexed: 12/20/2022] Open
Abstract
(1) Background: We analyzed, using PET-SCAN and cognitive tests, how growth hormone (GH) could act in the brain of an older woman, not deficient in GH, who showed mild cognitive alterations (MCI) and had a genotype of ApoE 4/3 and familial dyslipidemia. (2) Methods: After performing a first psychometric study (TAVEC verbal learning test), the metabolic activity of brain structures related to knowledge, memory, and behavior was analyzed using 18-F fluorodeoxyglucose PET-SCAN. The patient was then treated with GH (0.4 mg/day, subcutaneous) for three weeks and on the last day under this treatment, a new PET-SCAN was performed. One month after beginning treatment with GH, a new TAVEC test was performed. (3) Results: GH administration normalized the cognitive deficits observed in the first psychometric test and significantly (p < 0.025) increased the metabolic activity in practically all brain cortical areas, specifically in the left hippocampus and left amygdala, although not in the left parahippocampus. (4) Conclusions: This study demonstrates for the first time the positive effects of GH on cerebral metabolism in a patient without GH deficiency, recovering the function of affected areas related to knowledge, memory, and behavior in an elderly patient with MCI.
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Speckmann T, Sabatini PV, Nian C, Smith RG, Lynn FC. Npas4 Transcription Factor Expression Is Regulated by Calcium Signaling Pathways and Prevents Tacrolimus-induced Cytotoxicity in Pancreatic Beta Cells. J Biol Chem 2015; 291:2682-95. [PMID: 26663079 DOI: 10.1074/jbc.m115.704098] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Indexed: 12/16/2022] Open
Abstract
Cytosolic calcium influx activates signaling pathways known to support pancreatic beta cell function and survival by modulating gene expression. Impaired calcium signaling leads to decreased beta cell mass and diabetes. To appreciate the causes of these cytotoxic perturbations, a more detailed understanding of the relevant signaling pathways and their respective gene targets is required. In this study, we examined the calcium-induced expression of the cytoprotective beta cell transcription factor Npas4. Pharmacological inhibition implicated the calcineurin, Akt/protein kinase B, and Ca(2+)/calmodulin-dependent protein kinase signaling pathways in the regulation of Npas4 transcription and translation. Both Npas4 mRNA and protein had high turnover rates, and, at the protein level, degradation was mediated via the ubiquitin-proteasome pathway. Finally, beta cell cytotoxicity of the calcineurin inhibitor and immunosuppressant tacrolimus (FK-506) was prevented by Npas4 overexpression. These results delineate the pathways regulating Npas4 expression and stability and demonstrate its importance in clinical settings such as islet transplantation.
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Affiliation(s)
- Thilo Speckmann
- From the Diabetes Research Program, Child and Family Research Institute, Vancouver, British Columbia V5Z 4H4, Canada and the Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
| | - Paul V Sabatini
- From the Diabetes Research Program, Child and Family Research Institute, Vancouver, British Columbia V5Z 4H4, Canada and the Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
| | - Cuilan Nian
- From the Diabetes Research Program, Child and Family Research Institute, Vancouver, British Columbia V5Z 4H4, Canada and the Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
| | - Riley G Smith
- From the Diabetes Research Program, Child and Family Research Institute, Vancouver, British Columbia V5Z 4H4, Canada and
| | - Francis C Lynn
- From the Diabetes Research Program, Child and Family Research Institute, Vancouver, British Columbia V5Z 4H4, Canada and the Department of Surgery and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
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Quinnies KM, Bonthuis PJ, Harris EP, Shetty SR, Rissman EF. Neural growth hormone: regional regulation by estradiol and/or sex chromosome complement in male and female mice. Biol Sex Differ 2015; 6:8. [PMID: 25987976 PMCID: PMC4434521 DOI: 10.1186/s13293-015-0026-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Accepted: 03/13/2015] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Sex differences in pituitary growth hormone (GH) are well documented and coordinate maturation and growth. GH and its receptor are also produced in the brain where they may impact cognitive function and synaptic plasticity, and estradiol produces Gh sex differences in rat hippocampus. In mice, circulating estradiol increases Gh mRNA in female but not in male medial preoptic area (mPOA); therefore, additional factors regulate sexually dimorphic Gh expression in the brain. Thus, we hypothesized that sex chromosomes interact with estradiol to promote sex differences in GH. Here, we assessed the contributions of both estradiol and sex chromosome complement on Gh mRNA levels in three large brain regions: the hippocampus, hypothalamus, and cerebellum. METHODS We used the four core genotypes (FCG) mice, which uncouple effects of sex chromosomes and gonadal sex. The FCG model has a deletion of the sex-determining region on the Y chromosome (Sry) and transgenic insertion of Sry on an autosome. Adult FCG mice were gonadectomized and given either a blank Silastic implant or an implant containing 17β-estradiol. Significant differences in GH protein and mRNA were attributed to estradiol replacement, gonadal sex, sex chromosome complement, and their interactions, which were assessed by ANOVA and planned comparisons. RESULTS Estradiol increased Gh mRNA in the cerebellum and hippocampus, regardless of sex chromosome complement or gonadal sex. In contrast, in the hypothalamus, females had higher Gh mRNA than males, and XY females had more Gh mRNA than XY males and XX females. This same pattern was observed for GH protein. Because the differences in Gh mRNA in the hypothalamus did not replicate prior studies using other mouse models and tissue from mPOA or arcuate nucleus, we examined GH protein in the arcuate, a subdivision of the hypothalamus. Like the previous reports, and in contrast to the entire hypothalamus, a sex chromosome complement effect showed that XX mice had more GH than XY in the arcuate. CONCLUSIONS Sex chromosome complement regulates GH in some but not all brain areas, and within the hypothalamus, sex chromosomes have cell-specific actions on GH. Thus, sex chromosome complement and estradiol both contribute to GH sex differences in the brain.
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Affiliation(s)
- Kayla M Quinnies
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908 USA ; Neuroscience Graduate Program, University of Virginia School of Medicine, Charlottesville, VA 22908 USA
| | - Paul J Bonthuis
- Department of Neurobiology and Anatomy, University of Utah, 20 North 1900 East, Salt Lake City, UT 84132-3401 USA
| | - Erin P Harris
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908 USA ; Neuroscience Graduate Program, University of Virginia School of Medicine, Charlottesville, VA 22908 USA
| | - Savera Rj Shetty
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908 USA ; Neuroscience Graduate Program, University of Virginia School of Medicine, Charlottesville, VA 22908 USA
| | - Emilie F Rissman
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695 USA
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