Project description:Interleukin (IL)-37, an antiinflammatory IL-1 family cytokine, is a key suppressor of innate immunity. IL-37 signaling requires the heterodimeric IL-18R1 and IL-1R8 receptor, which is abundantly expressed in the gastrointestinal tract. Here we report a 4-mo-old male from a consanguineous family with a homozygous loss-of-function IL37 mutation. The patient presented with persistent diarrhea and was found to have infantile inflammatory bowel disease (I-IBD). Patient cells showed increased intracellular IL-37 expression and increased proinflammatory cytokine production. In cell lines, mutant IL-37 was not stably expressed or properly secreted and was thus unable to functionally suppress proinflammatory cytokine expression. Furthermore, induced pluripotent stem cell-derived macrophages from the patient revealed an activated macrophage phenotype, which is more prone to lipopolysaccharide and IL-1β stimulation, resulting in hyperinflammatory tumor necrosis factor production. Insights from this patient will not only shed light on monogenic contributions of I-IBD but may also reveal the significance of the IL-18 and IL-37 axis in colonic homeostasis.
Project description:Expression profiling of human colon mucosa samples aquired from inflammatory bowel disease patients and healthy controls. Expression profiling was done using Illumina Human HT-12 arrays, and data analysis was performed using tools from the Bioconductor package
Project description:The goal of this study was to identify new mutations in the ENPP1 gene that produce infantile arterial calcification and fetal demise. A stillborn (proband) was diagnosed with infantile arterial calcification. Mutations in the ENPP1 gene account for ~80% of the cases of infantile arterial calcification through loss of function in both alleles (recessive inheritance).
Project description:Through BioID and mass spectrometry, we investigated SIT1 interactome in a patient with a homozygous SIT1 splice-site variant leading to immunodeficiency and lymphoma. SIT1, previously identified as a negative regulator of T-cell activation, was found to interact with vesicle trafficking proteins, including components of the SCAR/WAVE complex, TRAPP complex, and clathrin-coated pits.
Project description:Inflammatory bowel disease (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), is associated with a loss or an imbalance of host-microbe interactions. Depletion-assisted deep metaproteomics was employed to reveal disease-specific networks of host-microbial protein associations in IBD.