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Bando SY, Bertonha FB, Menezes PHN, Takahara AK, Khaled NA, Santos P, S Junqueira M, Cesar RM, Moreira-Filho CA. Transcriptomic analysis reveals distinct adaptive molecular mechanism in the hippocampal CA3 from rats susceptible or not-susceptible to hyperthermia-induced seizures. Sci Rep 2023; 13:10265. [PMID: 37355705 PMCID: PMC10290664 DOI: 10.1038/s41598-023-37535-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/23/2023] [Indexed: 06/26/2023] Open
Abstract
Febrile seizures during early childhood are a relevant risk factor for the development of mesial temporal lobe epilepsy. Nevertheless, the molecular mechanism induced by febrile seizures that render the brain susceptible or not-susceptible to epileptogenesis remain poorly understood. Because the temporal investigation of such mechanisms in human patients is impossible, rat models of hyperthermia-induced febrile seizures have been used for that purpose. Here we conducted a temporal analysis of the transcriptomic and microRNA changes in the ventral CA3 of rats that develop (HS group) or not-develop (HNS group) seizures after hyperthermic insult on the eleventh postnatal day. The selected time intervals corresponded to acute, latent, and chronic phases of the disease. We found that the transcriptional differences between the HS and the HNS groups are related to inflammatory pathways, immune response, neurogenesis, and dendritogenesis in the latent and chronic phases. Additionally, the HNS group expressed a greater number of miRNAs (some abundantly expressed) as compared to the HS group. These results indicate that HNS rats were able to modulate their inflammatory response after insult, thus presenting better tissue repair and re-adaptation. Potential therapeutic targets, including genes, miRNAs and signaling pathways involved in epileptogenesis were identified.
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Affiliation(s)
- Silvia Y Bando
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil.
| | - Fernanda B Bertonha
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
| | - Pedro H N Menezes
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
| | - André K Takahara
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
| | - Nathália A Khaled
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
| | - Paula Santos
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
| | - Mara S Junqueira
- Department of Radiology and Oncology, Centro de Investigação Translacional em Oncologia-Instituto do Câncer do Estado de São Paulo, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-000, Brazil
| | - Roberto M Cesar
- Department of Computer Science, Instituto de Matemática e Estatística da Universidade de São Paulo, São Paulo, SP, 05508-040, Brazil
| | - Carlos A Moreira-Filho
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, 05403-900, Brazil
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Li Y, Iida H, Kimata K, Zhuo L, Ota A, Kimura S, Yin X, Deie M, Ushida T. Establishment of a mouse model for injury-induced scar formation and the accompanying chronic pain: Comprehensive microarray analysis of molecular expressions in fibrosis and hyperalgesia. Mol Pain 2019; 15:1744806919892389. [PMID: 31749400 PMCID: PMC6997725 DOI: 10.1177/1744806919892389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Surgery is often accompanied by scar formation, which results in a
pathological state called fibrosis. Fibrosis is characterized by the excess
deposition of extracellular matrix molecules in the connective tissue,
leading to tissue contracture and chronic pain. To understand the molecular
mechanisms underlying these processes and their causative relationships, we
performed comprehensive analyses of gene expression changes in the hind paw
tissue of a mouse model established by generating a scar in the sole. Results Subcutaneous tissue was extensively stripped from the sole of the operation
group mice, while a needle was inserted in the sole of the sham group mice.
Pain threshold, as evaluated by mechanical stimulation with von Frey fiber,
decreased rapidly in the operated (ipsilateral) paw and a day later in the
nonoperated (contralateral) paw. The reductions were maintained for more
than three weeks, suggesting that chronic pain spread to the other tissues
via the central nervous system. RNA from the paw and the dorsal root
ganglion (L3–L5) tissues were subjected to microarray analyses one and two
weeks following the operation. The expressions of a number of genes,
especially those coding for extracellular matrix molecules and peripheral
perceptive nerve receptors, were altered in the operation group mice paw
tissues. The expression of few genes was altered in the dorsal root ganglion
tissues; distinct upregulation of some nociceptive genes such as
cholecystokinin B receptor was observed. Results of real-time polymerase
chain reaction and immune and histochemical staining of some of the gene
products confirmed the results of the microarray analysis. Conclusion Analyses using a novel mouse model revealed the extensive involvement of
extracellular matrix-related genes and peripheral perceptive nerve receptor
genes resulting in scar formation with chronic pain. Future bioinformatics
analyses will explore the association between these relationships.
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Affiliation(s)
- Yuqiang Li
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, School of Physical Education and Health, East China Normal University, Shanghai, China.,Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
| | - Hiroki Iida
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
| | - Koji Kimata
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
| | - Lisheng Zhuo
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
| | - Akinobu Ota
- Department of Biochemistry, Aichi Medical University, Nagakute, Japan
| | - Shinya Kimura
- Department of Rehabilitation Medicine, Aichi Medical University, Nagakute, Japan
| | - Xiaojian Yin
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, School of Physical Education and Health, East China Normal University, Shanghai, China
| | - Masataka Deie
- Department of Orthopaedic Surgery, Aichi Medical University, Nagakute, Japan
| | - Takahiro Ushida
- Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
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Abstract
Chronic Valproic Acid Treatment Triggers Increased Neuropeptide Y Expression and Signaling in Rat Nucleus Reticularis Thalami. Brill J, Lee M, Zhao S, Fernald RD, Huguenard JR. J Neurosci 2006;26:6813–6822. Valproate (VPA) can suppress absence and other seizures, but its precise mechanisms of action are not completely understood. We investigated whether VPA influences the expression of neuropeptide Y (NPY), an endogenous anticonvulsant. Chronic VPA administration to young rats (300–600 mg · kg–1 · d–1 in divided doses over 4 d) resulted in a 30–50% increase in NPY mRNA and protein expression in the nucleus reticularis thalami (nRt) and hippocampus, but not in the neocortex, as shown by real-time PCR, radioimmunoassay, and immunohistochemistry. No increased expression was observed after a single acute dose of VPA. Chronic treatment with the pharmacologically inactive VPA analog octanoic acid did not elicit changes in NPY expression. No significant expression changes could be shown for the mRNAs of the Y1 receptor or of the neuropeptides somatostatin, vasoactive intestinal polypeptide, and choleocystokinin. Fewer synchronous spontaneous epileptiform oscillations were recorded in thalamic slices from VPA-treated animals, and oscillation duration as well as the period of spontaneous and evoked oscillations were decreased. Application of the Y1 receptor inhibitor N2-(diphenylacetyl)- N-[(4-hydroxyphenyl)methyl]-d-arginine-amide (BIBP3226) enhanced thalamic oscillations, indicating that NPY is released during those oscillations and acts to downregulate oscillatory strength. Chronic VPA treatment significantly potentiated the effect of BIBP3226 on oscillation duration but not on oscillation period. These results demonstrate a novel mechanism for the antiepileptic actions of chronic VPA therapy.
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