Myeloid cell iron uptake pathways and paramagnetic rim formation in multiple sclerosis
In multiple sclerosis (MS), sustained inflammatory activity can be visualized by iron-sensitive magnetic resonance imaging (MRI) at the edges of chronic lesions. These paramagnetic rim lesions (PRLs) are associated with clinical worsening, although the cell type-specific and molecular pathways of ir...
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
November 2023
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| In: |
Acta neuropathologica
Year: 2023, Volume: 146, Issue: 5, Pages: 707-724 |
| ISSN: | 1432-0533 |
| DOI: | 10.1007/s00401-023-02627-4 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1007/s00401-023-02627-4 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/s00401-023-02627-4 
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| Author Notes: | Annika Hofmann, Nik Krajnc, Assunta Dal-Bianco, Christian J. Riedl, Tobias Zrzavy, Celia Lerma-Martin, Gregor Kasprian, Claudia E. Weber, Francesco Pezzini, Fritz Leutmezer, Paulus Rommer, Gabriel Bsteh, Michael Platten, Achim Gass, Thomas Berger, Philipp Eisele, Roberta Magliozzi, Lucas Schirmer, Simon Hametner |
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| 245 | 1 | 0 | |a Myeloid cell iron uptake pathways and paramagnetic rim formation in multiple sclerosis |c Annika Hofmann, Nik Krajnc, Assunta Dal-Bianco, Christian J. Riedl, Tobias Zrzavy, Celia Lerma-Martin, Gregor Kasprian, Claudia E. Weber, Francesco Pezzini, Fritz Leutmezer, Paulus Rommer, Gabriel Bsteh, Michael Platten, Achim Gass, Thomas Berger, Philipp Eisele, Roberta Magliozzi, Lucas Schirmer, Simon Hametner |
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| 520 | |a In multiple sclerosis (MS), sustained inflammatory activity can be visualized by iron-sensitive magnetic resonance imaging (MRI) at the edges of chronic lesions. These paramagnetic rim lesions (PRLs) are associated with clinical worsening, although the cell type-specific and molecular pathways of iron uptake and metabolism are not well known. We studied two postmortem cohorts: an exploratory formalin-fixed paraffin-embedded (FFPE) tissue cohort of 18 controls and 24 MS cases and a confirmatory snap-frozen cohort of 6 controls and 14 MS cases. Besides myelin and non-heme iron imaging, the haptoglobin-hemoglobin scavenger receptor CD163, the iron-metabolizing markers HMOX1 and HAMP as well as immune-related markers P2RY12, CD68, C1QA and IL10 were visualized in myeloid cell (MC) subtypes at RNA and protein levels across different MS lesion areas. In addition, we studied PRLs in vivo in a cohort of 98 people with MS (pwMS) via iron-sensitive 3 T MRI and haptoglobin genotyping by PCR. CSF samples were available from 38 pwMS for soluble CD163 (sCD163) protein level measurements by ELISA. In postmortem tissues, we observed that iron uptake was linked to rim-associated C1QA-expressing MC subtypes, characterized by upregulation of CD163, HMOX1, HAMP and, conversely, downregulation of P2RY12. We found that pwMS with $$\ge |4 PRLs had higher sCD163 levels in the CSF than pwMS with $$\le |3 PRLs with sCD163 correlating with the number of PRLs. The number of PRLs was associated with clinical worsening but not with age, sex or haptoglobin genotype of pwMS. However, pwMS with Hp2-1/Hp2-2 haplotypes had higher clinical disability scores than pwMS with Hp1-1. In summary, we observed upregulation of the CD163-HMOX1-HAMP axis in MC subtypes at chronic active lesion rims, suggesting haptoglobin-bound hemoglobin but not transferrin-bound iron as a critical source for MC-associated iron uptake in MS. The correlation of CSF-associated sCD163 with PRL counts in MS highlights the relevance of CD163-mediated iron uptake via haptoglobin-bound hemoglobin. Also, while Hp haplotypes had no noticeable influence on PRL counts, pwMS carriers of a Hp2 allele might have a higher risk to experience clinical worsening. | ||
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| 650 | 4 | |a Iron metabolism | |
| 650 | 4 | |a Magnetic resonance imaging | |
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