Postdoctoral Research Fellowship in Immunology
A 3-year postdoctoral fellowship is available at the Department of Immunology, Oslo University Hospital. The position will be located in the lab of Dr. Rasmus Iversen and will be available from March ...
A 3-year postdoc position in experimental immunology is available in our lab at Oslo University Hospital. If you know someone who is interested in B cells and autoimmunity, please spread the word! You can find more information and apply for the position here: 2411.webcruiter.no/Main2/Recrui...
19.12.2025 15:00
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Collectively, our results suggest that systemic and gut IgA responses against bacteria originate from discrete anatomical sites with inductive sites in the upper aerodigestive tract likely playing a prominent role in generation of systemic IgA.
07.07.2025 08:37
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Notably, while IgA plasma cells in the bone marrow were almost exclusively of the IgA1 subclass, gut plasma cells showed an equal distribution between IgA1 and IgA2.
07.07.2025 08:35
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Further, by conducting scRNA-seq on isolated plasma cells from paired samples of bone marrow and gut, we map differences in gene expression and VDJ repertoire between the two compartments. We also identify shared clonotypes with reactivity to bacterial antigens.
07.07.2025 08:34
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By isolating bacteria from duodenal biopsies, we show that serum IgA recognizes certain species of the upper GI tract. IgA secreted from gut plasma cells on the other hand showed broader reactivity to different bacteria.
07.07.2025 08:34
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Distinct systemic and gut IgA responses to bacteria of the human upper gastrointestinal tract
The mucosa lining the gastrointestinal tract harbors the body's largest population of plasma cells, most of which produce dimeric IgA destined for release into the lumen. In addition, there is systemic production of monomeric IgA circulating in the blood. Little is known about the connection between systemic and mucosal IgA. To address this relationship and to explore antibody responses against the microbiota, we isolated bacteria from duodenal biopsies and assessed antibody reactivity. Systemic IgA showed reactivity to bacteria of the upper gastrointestinal tract with a preference for binding Neisseria species, while duodenal IgA showed broader reactivity. We found limited clonal overlap between gut and bone marrow plasma cells of individual donors, yet a few shared clones specific to bacterial antigens were identified. Despite showing clonal overlap, gut and bone marrow plasma cells have distinct IgA subclass distributions, and they likely depend on B-cell activation at discrete anatomical sites. ### Competing Interest Statement The authors have declared no competing interest. Kristian Gerhard Jebsen Foundation, https://ror.org/021g6tq38, SKGJ-MED-017 Southern and Eastern Norway Regional Health Authority, https://ror.org/02qx2s478, 2022071 University of Oslo, https://ror.org/01xtthb56, WL-IMMUNOLOGY, Scientia Fellows II
Very happy to share our latest preprint, where we address the relationship between systemic and gut IgA. See link below and details in ๐งต. Huge thanks to everyone involved!
www.biorxiv.org/content/10.1...
07.07.2025 08:33
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Review @jimmunol.bsky.social
Can autoimmune disease be cured by deep CD19+ cell depletion?
doi.org/10.1093/jimm...
21.03.2025 17:58
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A triad of somatic mutagenesis converges in self-reactive B cells to cause a virus-induced autoimmune disease @cp-immunity.bsky.social
www.cell.com/immunity/ful...
16.01.2025 16:47
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Gut IgA1 and IgA2 subclasses co-emerge early in life, largely derive from clonally related and somatically mutated plasma cells in adults, and show unique changes of both frequency and reactivity in IBD @gmagrilab.bsky.social
doi.org/10.1084/jem....
19.11.2024 17:38
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This is great! I would love to join the party.
19.11.2024 13:48
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