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- Hakon, Jakob, et al.
(författare)
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Multisensory stimulation improves functional recovery and resting-state functional connectivity in the mouse brain after stroke
- 2018
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Ingår i: NeuroImage: Clinical. - : Elsevier BV. - 2213-1582. ; 17, s. 717-730
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Tidskriftsartikel (refereegranskat)abstract
- Stroke causes direct structural damage to local brain networks and indirect functional damage to distant brain regions. Neuroplasticity after stroke involves molecular changes within perilesional tissue that can be influenced by regions functionally connected to the site of injury. Spontaneous functional recovery can be enhanced by rehabilitative strategies, which provides experience-driven cell signaling in the brain that enhances plasticity. Functional neuroimaging in humans and rodents has shown that spontaneous recovery of sensorimotor function after stroke is associated with changes in resting-state functional connectivity (RS-FC) within and across brain networks. At the molecular level, GABAergic inhibitory interneurons can modulate brain plasticity in peri-infarct and remote brain regions. Among this cell-type, a decrease in parvalbumin (PV)-immunoreactivity has been associated with improved behavioral outcome. Subjecting rodents to multisensory stimulation through exposure to an enriched environment (EE) enhances brain plasticity and recovery of function after stroke. Yet, how multisensory stimulation relates to RS-FC has not been determined. In this study, we investigated the effect of EE on recovery of RS-FC and behavior in mice after stroke, and if EE-related changes in RS-FC were associated with levels of PV-expressing neurons. Photothrombotic stroke was induced in the sensorimotor cortex. Beginning 2 days after stroke, mice were housed in either standard environment (STD) or EE for 12 days. Housing in EE significantly improved lost tactile-proprioceptive function compared to mice housed in STD environment. RS-FC in the mouse was measured by optical intrinsic signal imaging 14 days after stroke or sham surgery. Stroke induced a marked reduction in RS-FC within several perilesional and remote brain regions. EE partially restored interhemispheric homotopic RS-FC between spared motor regions, particularly posterior secondary motor. Compared to mice housed in STD cages, EE exposure lead to increased RS-FC between posterior secondary motor regions and contralesional posterior parietal and retrosplenial regions. The increased regional RS-FC observed in EE mice after stroke was significantly correlated with decreased PV-immunoreactivity in the contralesional posterior motor region. In conclusion, experimental stroke and subsequent housing in EE induces dynamic changes in RS-FC in the mouse brain. Multisensory stimulation associated with EE enhances RS-FC among distinct brain regions relevant for recovery of sensorimotor function and controlled movements that may involve PV/GABA interneurons. Our results indicate that targeting neural circuitry involving spared motor regions across hemispheres by neuromodulation and multimodal sensory stimulation could improve rehabilitation after stroke.
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- Lindén, Thomas, 1962, et al.
(författare)
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APOE is a strong gender-dependant risk factor for post-stroke major depression
- 2009
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Ingår i: European Stoke Conference, Stockholm, Maj.
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Konferensbidrag (refereegranskat)abstract
- BACKGROUND: Stroke is a major disease that annually affects 15 million people worldwide. Impaired mood is a common and serious complication. Previous studies indicate that Apolipoprotein E (APOE) alleles differently incur risks for late-life onset depression. The aim of this study was to analyse APOE as a risk factor in men and women for depressive disorders late after stroke. METHODS: Two-hundred and forty-three stroke patients over 70 years of age entered a longitudinal, naturalistic hospital-based study. One hundred and forty nine were assessed for cognitive impairments and depression and 88 were genetically tested one and a half years later. RESULTS: Thirty-three percent had any depression, 15% major depressive disorder. Genotypes 3/2 and 4/2 associated to depression. Major depressive disorder, but not all depression, related strongly to APOE carriership (OR 6.0; 95%CI 1.6 to 22), and was stronger for women (OR 17: 95% CI 1.6 to 174) than for men. CONCLUSION: In this first study to analyse the association between APOE genotypes and post-stroke depression, we found that APOE increased the risk for depression, especially in women. The results call for further studies to confirm and clarify the mechanisms for these effects as well as for the difference between sexes.
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| 4. |
- Taylor, Susan, et al.
(författare)
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Assessing body sensations in children : Intra-rater reliability of assessment and effects of age
- 2019
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Ingår i: British Journal of Occupational Therapy. - : Sage Publications. - 0308-0226 .- 1477-6006. ; 82:3, s. 179-185
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: This article examines the effect of age and gender on somatosensory capacity for children and adolescents, and provides preliminary normative data and reliability for the SenScreen © Kids, a new standardised measure of touch, wrist position sense and haptic object recognition.Method: A cross-sectional study of 88 typically developing children aged 6–15 years (mean 10.3 years; SD 2.6 years) was used to determine the developmental effects of age and gender on somatosensory capacity. Intra-rater reliability was assessed in 22 of the 88 participants at two time points (mean 8.8 years; SD 2.6 years).Results: Statistically significant differences were observed between age groups for tactile discrimination, wrist position sense and haptic object recognition, but not for touch registration for which all except one participant achieved a maximum score. There was no effect of gender. Three of four SenScreen Kids subtests demonstrated good intra-rater agreement between time points.Conclusions: Somatosensory capacity increased with age for typically developing children aged 6–15 years. Three subtests of the SenScreen Kids demonstrated good intra-rater reliability with typically developing children. Further investigation of reliability is required, and all subtests require psychometric testing with clinical populations.
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| 5. |
- Taylor, Susan, et al.
(författare)
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Haptic exploratory procedures of children and youth with and without cerebral palsy
- 2019
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Ingår i: Physical & Occupational Therapy in Pediatrics. - : Taylor & Francis. - 0194-2638 .- 1541-3144. ; 39:3, s. 337-351
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Tidskriftsartikel (refereegranskat)abstract
- Aims: Compare haptic exploratory procedures (EPs) and exploratory movements (EMs) of children. This study also tested the interrater reliability of a novel digital recording method.Methods: Participants were 31 children with typical development (TD) (aged 6 years 1 month to 15 years 9 months; 14 male) and 23 children with spastic unilateral cerebral palsy (CP) (aged 6 years to 15 years 5 months; 13 males; right hemiplegia, n = 12).Results: There were no statistically significant differences between groups for expected EP (p =.15), additional EPs (p =.78), or EMs (p =.69) but there was for mean duration of exploration (p <.001) and accuracy (p <.001). This suggests that although children with CP performed similar haptic EPs for each object as children with TD, they took more time and were less accurate in their identification. There was substantial agreement between the two raters' observations of expected EP, κ =.64, p <.0005.Conclusion: Children with CP performed similar haptic EPs as their TD peers. However, despite similarities, the results indicate that for children with CP manual ability was not the primary determinant of accuracy or speed of identification. This study provides evidence for a reliable method of recording haptic EPs.
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