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Central post-stroke pain is a severe persistent pain disease that affects 12% of stroke survivors (CPSP). These patients may have a cognitive impairment, depression, and sleep apnea, which leave them open to misdiagnosis and mistreatment. However, there has been little research on whether the neurohormone melatonin can effectively reduce pain in CPSP conditions. In the present study, we labeled melatonin receptors in various brain regions of rats. Later, we established a CPSP animal model by intra-thalamic collagenase lesions. After a rehabilitation period of three weeks, melatonin was administered using different doses (i.e., 30 mg/kg, 60 mg/kg, 120 mg/kg) for the following three weeks. Mechanical allodynia, thermal hyperalgesia, and cold allodynia behavioral tests were performed. Immediately after behavioral parameters were tested, animals were sacrificed, and the thalamus and cortex were isolated for biochemical (mitochondrial complexes/enzyme assays and LPO, GSH levels) and neuroinflammatory (TNF-α, IL-1β, IL-6) assessments. The results show that melatonin receptors were abundant in VPM/VPL regions. The thalamic lesion significantly induced pain behaviors in the mechanical, thermal planters, and cold allodynia tests. A significant decrease in mitochondrial chain complexes (C-I, II, III, IV) and enzymes (SOD, CAT, Gpx, SDH) was observed after the thalamic lesion. While there were significant increases in reactive oxygen species levels, including increases in LPO, the levels of reduced GSH were decreased in both the cortex and thalamus. Proinflammatory infiltration was noticed after the thalamic lesion, as there was a significant elevation in levels of TNF-α, IL-1β, and IL-6. Administration of melatonin has been shown to reverse the injury effect dose-dependently. Moreover, a significant increase in C-I, IV, SOD, CAT, and Gpx levels occurred in the CPSP group. Proinflammatory cytokines were significantly reduced by melatonin treatments. Melatonin seems to mediate its actions through MT1 receptors by preserving mitochondrial homeostasis, reducing free radical generation, enhancing mitochondrial glutathione levels, safeguarding the proton potential in the mitochondrial ETC by stimulating complex I and IV activities, and protecting the neuronal damage. In summary, exogenous melatonin can ameliorate pain behaviors in CPSP. The present findings may provide a novel neuromodulatory treatment in the clinical aspects of CPSP.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10049543 | PMC |
http://dx.doi.org/10.3390/ijms24065413 | DOI Listing |
Appl Neuropsychol Adult
December 2024
School of Nursing, University of Alabama at Birmingham, Birmingham, AL, USA.
As people live longer with HIV, reports of poor sleep and neurocognitive impairments are expected to increase. Poor sleep and neurocognitive impairments commonly occur in people living with HIV (PLWH) and some medications (e.g.
View Article and Find Full Text PDFFront Med (Lausanne)
December 2024
One Health Research Group, Univerisdad de las Americas, Quito, Ecuador.
Background: Iron overload disorders, including hereditary hemochromatosis (HH), are characterized by excessive iron accumulation, which can cause severe organ damage. HH is most associated with the C282Y mutation in Caucasian populations, but its prevalence and genetic profiles in Latin American populations remain underexplored.
Objectives: To describe the clinical manifestations, genetic profiles, and biochemical characteristics of patients with suspected iron overload disorders in a specialized hematology center in Cali, Colombia.
Front Psychiatry
December 2024
Center for Alcohol and Addiction Studies, School of Public Health, Brown University, Providence, RI, United States.
Introduction: Rates of prenatal cannabis use (PCU) have increased in recent years. Despite evidence of developmental health consequences to offspring and birthing person, there has been a reduction in the perception of PCU-related harms. Due to the stigma and risk of legal consequences associated with disclosing PCU, individuals are often cautious to seek information from their healthcare providers.
View Article and Find Full Text PDFFront Vet Sci
December 2024
Department of Small Animal Clinical Sciences, VA-MD College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, United States.
Chronic neuropathic pain is underdiagnosed in companion animals. This paper will review the definition of pain and how classification and grading of neuropathic pain can be applied from human to veterinary medicine to increase the recognition of and the confidence in a neuropathic pain diagnosis. The mechanisms of nociception and the pathophysiology of the sensory systems that underlie the transition to chronic pain are described.
View Article and Find Full Text PDFBMC Psychiatry
December 2024
Department of Medical Affairs, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.
Background: This study explored the relationship between Adverse Childhood Experiences (ACE), physical pain, and depressive symptoms, and examined the mediating role of pain in the correlation between ACE and depressive symptoms among middle-aged and elderly Chinese (over the age of 45).
Methods: Cox proportional hazards regression models were used to analysis the association between ACE, physical pain, and depressive symptoms. To assess the mediating role of physical pain in the relationship between ACE and depressive symptoms, mediation analysis was conducted.
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