Abo-Shaban T

References (2)

Title : Faster Gastrointestinal Transit, Reduced Small Intestinal Smooth Muscle Tone and Dysmotility in the Nlgn3(R451C) Mouse Model of Autism - Hosie_2024_Int.J.Mol.Sci_25_
Author(s) : Hosie S , Abo-Shaban T , Mou K , Balasuriya GK , Mohsenipour M , Alamoudi MU , Filippone RT , Belz GT , Franks AE , Bornstein JC , Nurgali K , Hill-Yardin EL
Ref : Int J Mol Sci , 25 : , 2024
Abstract : Individuals with autism often experience gastrointestinal issues but the cause is unknown. Many gene mutations that modify neuronal synapse function are associated with autism and therefore may impact the enteric nervous system that regulates gastrointestinal function. A missense mutation in the Nlgn3 gene encoding the cell adhesion protein Neuroligin-3 was identified in two brothers with autism who both experienced severe gastrointestinal dysfunction. Mice expressing this mutation (Nlgn3(R451C) mice) are a well-studied preclinical model of autism and show autism-relevant characteristics, including impaired social interaction and communication, as well as repetitive behaviour. We previously showed colonic dysmotility in response to GABAergic inhibition and increased myenteric neuronal numbers in the small intestine in Nlgn3(R451C) mice bred on a mixed genetic background. Here, we show that gut dysfunction is a persistent phenotype of the Nlgn3 R451C mutation in mice backcrossed onto a C57BL/6 background. We report that Nlgn3(R451C) mice show a 30.9% faster gastrointestinal transit (p = 0.0004) in vivo and have 6% longer small intestines (p = 0.04) compared to wild-types due to a reduction in smooth muscle tone. In Nlgn3(R451C) mice, we observed a decrease in resting jejunal diameter (proximal jejunum: 10.6% decrease, p = 0.02; mid: 9.8%, p = 0.04; distal: 11.5%, p = 0.009) and neurally regulated dysmotility as well as shorter durations of contractile complexes (mid: 25.6% reduction in duration, p = 0.009; distal: 30.5%, p = 0.004) in the ileum. In Nlgn3(R451C) mouse colons, short contractions were inhibited to a greater extent (57.2% by the GABA(A) antagonist, gabazine, compared to 40.6% in wild-type mice (p = 0.007). The inhibition of nitric oxide synthesis decreased the frequency of contractile complexes in the jejunum (WT p = 0.0006, Nlgn3(R451C) p = 0.002), but not the ileum, in both wild-type and Nlgn3(R451C) mice. These findings demonstrate that changes in enteric nervous system function contribute to gastrointestinal dysmotility in mice expressing the autism-associated R451C missense mutation in the Neuroligin-3 protein.
ESTHER : Hosie_2024_Int.J.Mol.Sci_25_
PubMedSearch : Hosie_2024_Int.J.Mol.Sci_25_
PubMedID: 38255906
Gene_locus related to this paper: mouse-3neur

Title : The Emerging Role of the Gut-Brain-Microbiota Axis in Neurodevelopmental Disorders - Hosie_2022_Adv.Exp.Med.Biol_1383_141
Author(s) : Hosie S , Abo-Shaban T , Lee CYQ , Matta SM , Shindler A , Gore R , Sharna SS , Herath M , Crack PJ , Franks AE , Hill-Yardin EL
Ref : Advances in Experimental Medicine & Biology , 1383 :141 , 2022
Abstract : Autism spectrum disorder (ASD; autism) is a prevalent neurodevelopmental disorder associated with changes in gut-brain axis communication. Gastrointestinal (GI) symptoms are experienced by a large proportion of individuals diagnosed with autism. Several mutations associated with autism modify cellular communication via neuronal synapses. It has been suggested that modifications to the enteric nervous system, an intrinsic nervous system of the GI tract, could contribute to GI dysfunction. Changes in gut motility, permeability, and the mucosal barrier as well as shifts in the large population of microbes inhabiting the GI tract could contribute to GI symptoms. Preclinical research has demonstrated that mice expressing the well-studied R451C missense mutation in Nlgn3 gene, which encodes cell adhesion protein neuroligin-3 at neuronal synapses, exhibit GI dysfunction. Specifically, NL3(R451C) mice show altered colonic motility and faster small intestinal transit. As well as dysmotility, macrophages located within the gut-associated lymphoid tissue of the NL3(R451C) mouse caecum show altered morphology, suggesting that neuro-inflammation pathways are modified in this model. Interestingly, NL3(R451C) mice maintained in a shared environment demonstrate fecal microbial dysbiosis indicating a role for the nervous system in regulating gut microbial populations. To better understand host-microbe interactions, further clarification and comparison of clinical and animal model profiles of dysbiosis should be obtained, which in turn will provide better insights into the efforts taken to design personalized microbial therapies. In addition to changes in neurophysiological measures, the mucosal component of the GI barrier may contribute to GI dysfunction more broadly in individuals diagnosed with a wide range of neurological disorders. As the study of GI dysfunction advances to encompass multiple components of the gut-brain-microbiota axis, findings will help understand future directions such as microbiome engineering and optimisation of the mucosal barrier for health.
ESTHER : Hosie_2022_Adv.Exp.Med.Biol_1383_141
PubMedSearch : Hosie_2022_Adv.Exp.Med.Biol_1383_141
PubMedID: 36587154
Gene_locus related to this paper: human-NLGN3