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Pediatric obsessive-compulsive disorder (OCD) and autism spectrum disorder (ASD) have been associated with respiratory tract infections and alterations in the intestinal microbiome, respectively. Pediatric Acute-onset Neuropsychiatric Syndromes (PANS) refers to the sudden onset of neuropsychiatric symptoms that are triggered by several infectious and non-infectious factors. Studies indicate that inflammation plays an important etiological role in PANS, as well as in ASD associated with gut dysbiosis. The present review provides an overview of clinical studies of PANS and ASD associated with gastrointestinal symptoms, as well as existing strategies for investigating these syndromes in rodent models. The authors highlight similarities between these syndromes that may provide clues to common etiological mechanisms. Although data from animal models are consistent with an important role for anti-neuronal antibodies in PANS triggered by GAS infection, we lack models for identifying pathophysiological mechanisms of PANS associated with other infectious and noninfectious triggers. The authors propose an animal modeling strategy that incorporates known vulnerability and triggering factors for PANS into the modeling process. This novel strategy should expand our understanding of the pathophysiology of PANS, as well as facilitate the development of new pharmacological treatments for PANS and related syndromes.

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Pediatric neuropsychiatric syndromes associated with infection and microbiome alterations: clinical findings, possible role of the mucosal epithelium, and strategies for the development of new animal models