1. Deletion of SOCS2 Reduces Post-Colitis Fibrosis via Alteration of the TGFβ Pathway
- Author
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Ibrahim Al-Haddabi, Matar M Al-Maney, Amna Al-Araimi, Shadia Al Sinawi, Asma Bani Oraba, Amira Al Kharusi, and Fahad Zadjali
- Subjects
Male ,0301 basic medicine ,colitis ,medicine.medical_treatment ,Suppressor of Cytokine Signaling Proteins ,SMAD ,Inflammatory bowel disease ,lcsh:Chemistry ,Mice ,0302 clinical medicine ,Transforming Growth Factor beta ,Fibrosis ,Intestinal Mucosa ,lcsh:QH301-705.5 ,SOCS2 ,Spectroscopy ,Mice, Knockout ,biology ,Chemistry ,Dextran Sulfate ,Nitric oxide synthase 2 ,General Medicine ,Computer Science Applications ,Cytokine ,030220 oncology & carcinogenesis ,Cytokines ,Disease Susceptibility ,Signal Transduction ,medicine.medical_specialty ,suppressor of cytokine signaling protein ,Article ,Catalysis ,Inorganic Chemistry ,03 medical and health sciences ,inflammatory bowel disease ,Internal medicine ,medicine ,Animals ,Humans ,Physical and Theoretical Chemistry ,Colitis ,Molecular Biology ,fibrosis ,Organic Chemistry ,Transforming growth factor beta ,Inflammatory Bowel Diseases ,medicine.disease ,digestive system diseases ,Disease Models, Animal ,030104 developmental biology ,Endocrinology ,lcsh:Biology (General) ,lcsh:QD1-999 ,growth hormone ,biology.protein ,Biomarkers ,Gene Deletion - Abstract
Inflammatory bowel disease (IBD) is an immunologically mediated chronic intestinal disorder. Growth hormone (GH) administration enhances mucosal repair and decreases intestinal fibrosis in patients with IBD. In the present study, we investigated the effect of cellular sensitivity to GH via suppressor of cytokine signaling 2 (SOCS2) deletion on colitis and recovery. To induce colitis, wild type and SOCS2 knockout (SOCS2&minus, /&minus, ) mice were treated with 3% dextran sodium sulphate (DSS), followed by a recovery period. SOCS2&minus, mice showed higher disease activity during colitis with increased mRNA expression of the pro-inflammatory cytokines nitric oxide synthase 2 (NOS2) and interleukin 1 &beta, (IL1-&beta, ). At recovery time point, SOCS2&minus, showed better recovery with less fibrosis measured by levels of &alpha, SMA and collagen deposition. Protein and mRNA expressions of transforming growth factor beta &beta, 1 (TGF-&beta, 1) receptors were significantly lower in SOCS2&minus, mice compared to wild-type littermates. Using an in vivo bromodeoxyuridine (BrdU) proliferation assay, SOCS2&minus, mice showed higher intestinal epithelial proliferation compared to wild-type mice. Our results demonstrated that deletion of the SOCS2 protein results in higher growth hormone sensitivity associated with higher pro-inflammatory signaling, however, it resulted in less tissue damage with less fibrotic lesions and higher epithelial proliferation, which are markers of GH-protective effects in IBD. This suggests a pleiotropic effect of SOCS2 and multiple cellular targets. Further study is required to study role of SOCS2 in regulation of TGF&beta, mothers against the decapentaplegic homolog (Smad) pathway.
- Published
- 2020
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