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Gene expression profiling coupled with the Connectivity Map database-mining reveals potential therapeutic drugs for Hirschsprung disease

ABSTRACT: Hirschsprung disease (HD) is a congenital intestinal anomaly, which derives from a failure to form enteric ganglia in the lower bowel. Surgery is a major therapeutic strategy and neural stem cells transplantation is believed as a promising approach. However, we still face many challenges. To better characterize the pathology of HD, we used Agilent microarrays to analyze the gene expression profiles of surgically resected bowel tissue from 8 HD patients and 8 controls. A total of 253 genes were differentially expressed between the two groups using SAM software with threshold set at fold-change >2.0 and q-value <0.05. Gene Ontology analysis demonstrated that genes related to regulation of neuron development were significantly enriched. Differentially expressed genes (DEGs) involved in neuron development were further validated by quantitative real-time PCR (qRT-PCR) and immunohistochemistry. Moreover, in an attempt to seek potential drugs for HD, we correlated the observed gene expression patterns in HD to those of small molecule compounds via the Connectivity Map (cMap) database. Several compounds were screened that could rescue the dysregulated molecular signature in HD, proposing a testable hypothesis about possible therapeutic agents as a novel remedy for HD. In conclusion, our work may enhance our understanding the molecular changes in HD. More importantly, this study opens new fields of investigation into pharmacological intervention for HD.

ORGANISM(S): Homo sapiens

PROVIDER: GSE98502 | GEO | 2018/06/01

REPOSITORIES: GEO

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Project description:Achieving a mechanistic understanding of disease and initiating preclinical therapeutic trials necessitate the study of huntingtin toxicity and its remedy in model systems. To allow the engagement of appropriate experimental paradigms, Huntingtonâs disease (HD) models need to be validated in terms of how they recapitulate a particular aspect of human disease. In order to examine transcriptome-related effects of mutant huntingtin, we compared striatal mRNA profiles from seven genetic mouse models of disease to that of postmortem human HD caudate using microarray analysis. Transgenic models expressing short N-terminal fragments of mutant huntingtin (R6/1 and R6/2 mice) exhibited the most rapid effects on gene expression, consistent with previous studies. Although changes in the brains of knock-in models of HD took longer to appear, 15-month and 22-month CHL2Q150/Q150, 18-month HdhQ92/Q92 and 2-year-old YAC128 animals also exhibited significant HD-like mRNA signatures. When the affected genes were compared across models, a robust concordance was observed. Importantly, changes concordant across multiple lines mice were also in excellent agreement with the mRNA changes seen in human HD caudate. Although it was expected that the expression of full-length huntingtin transprotein might result in unique gene expression changes compared to those caused by expression of an N-terminal huntingtin fragment, no discernable differences between full-length and fragment models were detected. There was, however, an overall concordance between transcriptomic signature and disease stage. We thus conclude that the transcriptional changes of HD can be modelled in several available lines of transgenic mice, comprising lines expressing both N-terminal and full-length mutant huntingtin proteins. The combined analysis of mouse and human HD transcriptomes provides an important chronology of mutant huntingtin's gene expression effects. Experiment Overall Design: Striatal samples from 4 CHL2 Q150/Q150 mutant mice and 4 age-matched wild-type mice.

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Gene expression profiling coupled with the Connectivity Map database-mining reveals potential therapeutic drugs for Hirschsprung disease

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