Avipsha Datta, Department of Biophysics and Molecular Biology, University of Calcutta
Early life stress plays an awfully important role in brain development and very much contributes to the event of assorted mental disorders in later stages of life. A regular animal model like rats was taken to review different aspects of psychiatric disorders. Social isolation from the early years and its subsequent effects were studied. In rats, this isolation can induce long-lasting changes in molecular expression and social behavior. Since social isolation models cause psychiatric symptoms, it’s to be expected that it affects the overall wellbeing of the animals. As also promoted by the 3Rs principle, though, it’s pivotal to decrease the burden of laboratory animals by limiting the number of subjects (reduce, replace) and by improving the animals’ wellbeing (refine).
This study aimed to test possible refinement strategies like re-socialization and adult social isolation. The scientists examined whether the alternatives were still able to trigger the mandatory phenotype while minimizing the strain load on the animals. Interestingly, they didn’t find reduced wellbeing-associated burrowing performance in isolated rats. The hyperactive phenotype seen in socially isolated animals was observed for rats undergoing the adult-only isolation, but re-socializing improved the locomotor abnormality. Isolation had a prominent effect on the markers of neuroplasticity within the prefrontal cortex independent of timing. mRNA levels of Arc, Bdnf, and also the pool of Bdnf transcripts with the 3’ long UTR were reduced in every group. Also, Bdnf splice variant IV expression was highly reduced in lifelong-isolated animals. variety of those short-falls normalized after resocialization; likewise, exon VI Bdnf mRNA levels were reduced only in animals that were persistently isolated.
On the other hand, the expression of Gad67 and Pvb, two GABAergic markers, remain unaffected due to social deprivation, whereas changes occurred within the expression of dopamine d1 and d2 receptors. As adult isolation was sufficient to trigger the hyperactive phenotype and impaired neuroplasticity within the prefrontal cortex, it is often a candidate for a refinement strategy certainly research questions.
To fully understand the severity of post-weaning social isolation – adult isolation and resocialization deems to be a more prominent multimodal assessment approach.
Also read: Barriers to developing clinical trials in Lewy body dementia
References: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0240439
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