Pubmed du 16/04/23
1. Ahmadi BBM, Afarinesh MR, Jafaripour L, Sheibani V. Alteration in social interaction and tactile discrimination of juvenile autistic-like rats following tactile stimulation and whisker deprivation. Brain and behavior. 2023: e2993.
INTRODUCTION: Autism spectrum disorder is a developmental disorder that can affect sensory-motor behaviors in the valproic acid (Val) rodent model of autism. Although whisker deprivation (WD) induces plastic changes in the cortical neurons, tactile stimulation (TS) during the neonatal period may reverse it. Here, we investigate the interaction effects of TS and WD on behavioral and histologic features of barrel cortex neurons in juvenile Val-treated. METHODS: Control (CTL, CTL-TS, CTL-WD, and CTL-TS-WD groups) and Val-treated (Val, Val-TS, Val-WD, and Val-TS-WD groups) rats of both sexes were subjected to behavioral tests of social interaction, and novel texture recognition, and Nissl staining. The TS groups were exposed to sensory stimulation for 15 min, three times/day; moreover, all whiskers in the WD groups were trimmed every other day from postnatal days 1 to 21. RESULTS: Both prenatal valproic acid administration and postnatal WD decreased the rats’ performance percentage of the Val and CTL-WD groups of both sexes compared with the CTL groups in the social interaction and texture discrimination tests. Following TS, the performance of the Val-TS-WD group increased significantly compared to the Val group (p < .05), whereas the performance of the CTL-TS-WD group rescued to the CTL group. Nissl staining results also revealed the neuron degeneration percentage in the barrel field area of the Val and CTL-WD groups was increased significantly (p < .05) compared with the CTL group. In this regard, TS decreased the neuron degeneration percentage of the Val-TS-WD and the CTL-TS-WD groups, compared with the CTL group, significantly (p < .05). CONCLUSION: TS in juvenile male and female rats can act as a modulator and compensate for the behavioral and histological consequences of WD and prenatal valproic acid exposure.
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2. Bylemans T, Heleven E, Asselman E, Baetens K, Deroost N, Baeken C, Van Overwalle F. Sex differences in autistic adults: A preliminary study showing differences in mentalizing, but not in narrative coherence. Acta psychologica. 2023; 236: 103918.
Studying autism might be a complex endeavor due to its clinical heterogeneity. Little is currently known about potential sex differences in autistic adults, especially regarding mentalizing and narrative coherence. In this study, male and female participants told a personal story about one of their most positive and most negative life events and performed two mentalizing tasks. One of these mentalizing tasks was a recently developed Picture and Verbal Sequencing task that has shown cerebellar recruitment, and which requires mentalizing in a sequential context (i.e., participants chronologically ordered scenarios that required true and false belief mentalizing). Our preliminary comparison shows that males were faster and more accurate on the Picture Sequencing task compared to female participants when ordering sequences involving false beliefs, but not true beliefs. No sex differences were found for the other mentalizing and narrative tasks. These results highlight the importance of looking at sex differences in autistic adults and provide a possible explanation for sex-related differences in daily life mentalizing functions, which suggest a need for more sensitive diagnosis and tailored support.
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3. Choi JE, Kaang BK. Increased social interaction in Shank2-deficient mice following acute social isolation. Molecular brain. 2023; 16(1): 35.
Autism spectrum disorder (ASD) is neuropsychiatric disorder with a gender specific risk. Although social impairment in ASD is one of the well characterized phenotypes, loneliness issue resides in patients with ASD and emerging reports show gender distribution in symptoms. Acute social isolation increases the motivation to socially interact in a gender-dependent manner, as only the male mice show increase in sociability following isolation. However, it remains to be explored whether the effects of loneliness in ASD differ between genders. Here, we used Shank2-deficient (Shank2(-/-)) mice, one of the animal models of ASD, to examine the sociability changes after acute social isolation. While only the male wild-type (WT) mice display increased sociability following 24-h isolation, both sexes of Shank2(-/-) mice show an increase in social interaction following isolation. These observations provide evidence that animal models of ASD have the sensitivity to acute social isolation and further show the motivation to socially interact.
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4. Pickard K, Burrell TL, Brasher S, Buckley D, Gillespie S, Sharp W, Scahill L. Examining adaptations necessary to support the implementation of a parent-mediated intervention for children with autism spectrum disorder and moderate feeding problems. Autism : the international journal of research and practice. 2023: 13623613231166181.
Moderate feeding problems and disruptive mealtime behaviors are common in children with autism spectrum disorder. Although parent-mediated interventions are able to support feeding problems in autistic children, most research has occurred within specialty clinics when delivered by highly trained clinicians. Thus, the fit of these interventions within community settings is not clear. To address this limitation, this study explored adaptations to a parent-mediated intervention, Managing Eating Aversions and Limited Variety (i.e. MEAL Plan), to improve its fit and use within community settings. Participants were 14 multidisciplinary providers who attended one of the three intensive workgroups that included focus groups about the fit of MEAL Plan in their practice setting. Qualitative analysis was used to determine the main themes that came up within the focus groups. Specific themes included the appropriateness MEAL Plan for autistic and non-autistic children, how providers might adapt their delivery of MEAL Plan, billing and insurance considerations, administrator support for MEAL Plan, and the content and format of ongoing training and consultation. By proactively considering and responding to these factors, it may be possible to enhance MEAL Plan so that it is better able to be delivered and sustained within community practices that support autistic children.
