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Rasmus Iversen

@rasmusi

Immunologist and B-cell enthusiast at Oslo University Hospital.

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18.11.2024
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Latest posts by Rasmus Iversen @rasmusi

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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 ๐Ÿ‘ 0 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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PhD Research Fellowship in Immunology A 3-year PhD 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 2026. The...

We have two positions available in our lab at Oslo University Hospital: one PhD fellowship and one research technician. They are both related to autoantibodies in ulcerative colitis. Read more and apply here ๐Ÿ‘‡

PhD:
2411.webcruiter.no/Main2/Recrui...

Technician:
2411.webcruiter.no/Main2/Recrui...

25.11.2025 14:30 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

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 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

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 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

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 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

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 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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 ๐Ÿงต. Huge thanks to everyone involved!

www.biorxiv.org/content/10.1...

07.07.2025 08:33 ๐Ÿ‘ 9 ๐Ÿ” 6 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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PhD Research Fellowship in Immunology A 3-year PhD 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 August 2025. Th...

I am looking for a PhD candidate to join my lab in Oslo! We are trying to understand the role of antigen-specific B cells in autoimmunity. See details and apply here ๐Ÿ‘‡
2411.webcruiter.no/Main2/Recrui...

27.03.2025 17:59 ๐Ÿ‘ 5 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Ectopic germinal centers in the nasal turbinates contribute to B cell immunity to intranasal viral infection and vaccination | PNAS The nasal mucosa is the first immunologically active site that respiratory viruses encounter and establishing immunity at the initial point of path...

Our latest study by PhD student #RomainGailleton shows that upon #influenza infection, #Bcell can respond rapidly by forming ectopic #GerminalCenter within the nasal tissue.
The work has just been published in @pnas.org (1/N)

www.pnas.org/doi/10.1073/...

25.03.2025 10:28 ๐Ÿ‘ 48 ๐Ÿ” 12 ๐Ÿ’ฌ 3 ๐Ÿ“Œ 2
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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 ๐Ÿ‘ 12 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Enzyme-activating B-cell receptors boost antigen presentation to pathogenic T cells in gluten-sensitive autoimmunity Nature Communications - Dermatitis herpetiformis is a dermal manifestation of celiac disease and characterized by the presence of autoantibodies recognizing transglutaminase 3 (TG3). Here, the...

Very happy to share our paper on enzyme-activating BCRs out now in @naturecomms.bsky.social ๐Ÿ’ฅ
BCRs can do more than just bind antigen! By boosting the activity of target enzymes, they enhance pathogenic T cell-B cell interactions in gluten-sensitive autoimmunity. rdcu.be/ecXfG

10.03.2025 23:10 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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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 ๐Ÿ‘ 6 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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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 ๐Ÿ‘ 37 ๐Ÿ” 14 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

This is great! I would love to join the party.

19.11.2024 13:48 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Systematic benchmarking of mass spectrometry-based antibody sequencing reveals methodological biases The circulating antibody repertoire is crucial for immune protection, holding significant immunological and biotechnological value. While bottom-up mass spectrometry (MS) is the most widely used prote...

We created one of the largest antibody bottom-up proteomics datasets to query the impact of experimental and computational parameters on the reconstruction of antibody sequences. www.biorxiv.org/content/10.1... Brilliant work by @mchernigovskaya.bsky.social, Khang Le Quy and Igor Snapkow.

18.11.2024 18:14 ๐Ÿ‘ 26 ๐Ÿ” 12 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0