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Rostami F, Abbasi Z, Fereidoni M. Long-term follow-up of intracerebroventricular injection of streptozotocin-inducing pain sensitization. Behav Pharmacol 2022; 33:542-550. [PMID: 36256700 DOI: 10.1097/fbp.0000000000000701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Age is known to be the major risk factor for both pain sensation and sporadic Alzheimer's disease (sAD). Pain management in AD is a critical health condition. However, assessing pain in sAD patients is challenging. The intracerebroventricularly injected streptozotocin (icv-STZ) rat model of sAD has been brought to the fore as a hopefully suitable model that could mimic some features of sAD. However, the exact mechanism by which this agent may induce AD-like pathology is largely unknown. In some studies, analgesic drugs have been suggested as possible prevention of AD and icv-STZ-induced AD-like pathology. Therefore, this study used formalin and tail-flick tests to investigate whether different doses of icv-STZ injections could affect acute and inflammatory pain sensation and edema volume over time. Behavioral responses were observed at four testing time points (1, 2.5, 3.5, and 6 months postinjection). The results indicate that icv-STZ was able to significantly decrease the animals' formalin pain threshold in both a time- and dose-dependent manner. Formalin-induced acute and chronic pain scores of animals treated with streptozotocin 3 mg/kg (STZ3) increased dramatically 2.5 months after injection and persisted thereafter. The augmentation in pain score induced by streptozotocin 1 mg/kg (STZ1) was observed from 3.5 months after STZ injection. However, the effect of streptozotocin 0.5 mg/kg (STZ0.5) was NS until 6 months after injection. However, formalin-induced paw edema occurred with a longer delay and was not detectable in STZ0.5-treated animals. In addition, only STZ3-treated animals significantly reduced the thermal pain threshold of animals 6 months after injection. These observations indicate that icv-STZ can sensitize central and/or peripheral receptors to pain. The effect of STZ is dose- and time-dependent. AD-like pathology induced by icv-STZ could be partially activated via pain processing pathways. Therefore, anti-inflammatory agents could alleviate AD-like symptoms via pain treatments.
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Affiliation(s)
- Farzaneh Rostami
- Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
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McGill M, Hight AE, Watanabe YL, Parthasarathy A, Cai D, Clayton K, Hancock KE, Takesian A, Kujawa SG, Polley DB. Neural signatures of auditory hypersensitivity following acoustic trauma. eLife 2022; 11:e80015. [PMID: 36111669 PMCID: PMC9555866 DOI: 10.7554/elife.80015] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 09/14/2022] [Indexed: 11/25/2022] Open
Abstract
Neurons in sensory cortex exhibit a remarkable capacity to maintain stable firing rates despite large fluctuations in afferent activity levels. However, sudden peripheral deafferentation in adulthood can trigger an excessive, non-homeostatic cortical compensatory response that may underlie perceptual disorders including sensory hypersensitivity, phantom limb pain, and tinnitus. Here, we show that mice with noise-induced damage of the high-frequency cochlear base were behaviorally hypersensitive to spared mid-frequency tones and to direct optogenetic stimulation of auditory thalamocortical neurons. Chronic two-photon calcium imaging from ACtx pyramidal neurons (PyrNs) revealed an initial stage of spatially diffuse hyperactivity, hyper-correlation, and auditory hyperresponsivity that consolidated around deafferented map regions three or more days after acoustic trauma. Deafferented PyrN ensembles also displayed hypersensitive decoding of spared mid-frequency tones that mirrored behavioral hypersensitivity, suggesting that non-homeostatic regulation of cortical sound intensity coding following sensorineural loss may be an underlying source of auditory hypersensitivity. Excess cortical response gain after acoustic trauma was expressed heterogeneously among individual PyrNs, yet 40% of this variability could be accounted for by each cell's baseline response properties prior to acoustic trauma. PyrNs with initially high spontaneous activity and gradual monotonic intensity growth functions were more likely to exhibit non-homeostatic excess gain after acoustic trauma. This suggests that while cortical gain changes are triggered by reduced bottom-up afferent input, their subsequent stabilization is also shaped by their local circuit milieu, where indicators of reduced inhibition can presage pathological hyperactivity following sensorineural hearing loss.
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Affiliation(s)
- Matthew McGill
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Division of Medical Sciences, Harvard Medical SchoolBostonUnited States
| | - Ariel E Hight
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Division of Medical Sciences, Harvard Medical SchoolBostonUnited States
| | - Yurika L Watanabe
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
| | - Aravindakshan Parthasarathy
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Dongqin Cai
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Kameron Clayton
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Kenneth E Hancock
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Anne Takesian
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Sharon G Kujawa
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
| | - Daniel B Polley
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear InfirmaryBostonUnited States
- Department of Otolaryngology - Head and Neck Surgery, Harvard Medical SchoolBostonUnited States
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González-Rodríguez A, Monreal Ortiz JA. COVID-19 and physical health of women with severe mental illness. MEDICINA CLÍNICA (ENGLISH EDITION) 2022; 158:24-26. [PMID: 34901444 PMCID: PMC8648614 DOI: 10.1016/j.medcle.2021.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Feher B, Spandl LF, Lettner S, Ulm C, Gruber R, Kuchler U. Prediction of post-traumatic neuropathy following impacted mandibular third molar removal. J Dent 2021; 115:103838. [PMID: 34624417 DOI: 10.1016/j.jdent.2021.103838] [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: 08/25/2021] [Revised: 09/24/2021] [Accepted: 09/29/2021] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVES The extraction of impacted mandibular third molars is a common surgical procedure often associated with complications including post-traumatic neuropathy. Previous work has focused on identifying confounding factors, but a robust preoperative risk prediction model remains elusive. METHODS Using a dataset of 648 patients and 812 impacted mandibular third molars, we used least absolute shrinkage and selection operator (LASSO) to fit prediction models based on risk factors assessed at both the tooth and patient levels. In addition, we fitted multivariable logistic regression models with the Firth correction for generalized estimating equations (GEE). RESULTS The LASSO model for post-traumatic neuropathy identified distoangular impaction of ≥ 45° (odds ratio [OR] = 2.9), proximity to the inferior alveolar nerve of ≤ 3 mm (OR = 1.9), disadvantageous curving (OR = 1.4), and psychiatric conditions (OR = 2.1) as predictors [area under the receiving operator characteristic curve (AUC) = 0.75]. Among other complications analyzed, the LASSO model for bleeding identified deep embedding or full impaction (OR = 1.8), psychiatric conditions (OR = 1.3), and age (OR = 0.9) as predictors (AUC = 0.64). These associations between predictors and postoperative complications were fundamentally reinforced by the corresponding GEE models. CONCLUSIONS Our findings point to the predictability of post-traumatic neuropathy and bleeding based on tooth anatomy and patient characteristics, overall suggesting that preoperatively identifiable factors can predict the risk of adverse outcomes in the extraction of impacted mandibular third molars. CLINICAL SIGNIFICANCE Mandibular third molar extraction is both a routine procedure and a leading cause of trigeminal neuropathy. Prevention of post-traumatic neuropathy, aided by individualized preoperative risk prediction, is of high clinical relevance.
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Affiliation(s)
- Balazs Feher
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria; Department of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria
| | - Lisa-Franziska Spandl
- Department of Dental Training, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria
| | - Stefan Lettner
- Austrian Cluster for Tissue Regeneration, Vienna, Austria, Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Donaueschingenstrasse 13, 1200 Vienna, Austria; Core Facility Hard Tissue and Biomaterial Research, Karl Donath Laboratory, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria
| | - Christian Ulm
- Department of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria
| | - Reinhard Gruber
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria, Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Donaueschingenstrasse 13, 1200 Vienna, Austria; Department of Periodontology, School of Dental Medicine, University of Bern, Murtenstrasse 11, 3008 Bern, Switzerland
| | - Ulrike Kuchler
- Department of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria.
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González-Rodríguez A, Monreal Ortiz JA. COVID-19 and physical health of women with severe mental illness. Med Clin (Barc) 2021; 158:24-26. [PMID: 34600715 PMCID: PMC8435368 DOI: 10.1016/j.medcli.2021.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/03/2021] [Accepted: 09/06/2021] [Indexed: 11/19/2022]
Affiliation(s)
- Alexandre González-Rodríguez
- Servicio de Salud Mental. Hospital Universitari Mútua de Terrassa. Fundació Docència i Recerca Mútua de Terrassa. Universidad de Barcelona (UB), Terrassa, Barcelona, España.
| | - José Antonio Monreal Ortiz
- Servicio de Salud Mental. Hospital Universitari Mútua de Terrassa. Fundació Docència i Recerca Mútua de Terrassa. Universidad de Barcelona (UB). Instituto de Neurociencias. UAB. CIBERSAM, Terrassa, Barcelona, España
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