ArticleBiomolecules2022
A New Serum Macrophage Checkpoint Biomarker for Innate Immunotherapy: Soluble Signal-Regulatory Protein Alpha (sSIRPα).
Article in Biomolecules, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 10 citations in OpenAlex.
- Clinical significance of circulating macrophage markers across different stages of prostate cancer: highlighting soluble CD163.British journal of cancer · 2026Article
- SIRPα Cleavage Is Associated with Inflammatory Response, Corticosteroid Nonresponse, and Worse Prognosis in Clinical and Preclinical Models of Alcohol-Associated Hepatitis.The American journal of pathology · 2026Article
- Myokine SIRPα exacerbates kidney disease in diabetes.JCI insight · 2026Article
- The expression of signal regulatory protein alpha (SIRPα) in periodontal cells and tissue.Acta odontologica Scandinavica · 2024Article
- Biomimetic Integrated Nanozyme for Flare and Recurrence of Gouty Arthritis.Asian journal of pharmaceutical sciences · 2024Article
- Article
- Macrophage Biomarkers sCD163 and sSIRPα in Serum Predict Mortality in Sarcoma Patients.Cancers · 2023Article
Corrections and comments
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background and Aims: The macrophage “don’t eat me” pathway CD47/SIRPα is a target for promising new immunotherapy. We hypothesized that a soluble variant of SIRPα is present in the blood and may function as a biomarker. Methods: Monocyte derived macrophages (MDMs) from human buffy-coats were stimulated into macrophage subtypes by LPS and IFN-γ (M1), IL-4 and IL-13 (M2a), IL-10 (M2c) and investigated using flow cytometry. Soluble SIRPα (sSIRPα) was measured in cell cultures and serum by Western blotting and an optimized ELISA. Serum samples were obtained from 120 healthy individuals and from 8 individuals challenged by an LPS injection. Results: All macrophage phenotypes expressed SIRPα by flowcytometry, and sSIRPα was present in all culture supernatants including unstimulated cells. M1 macrophages expressed the lowest level of SIRPαand released the highest level of sSIRPα (p < 0.05). In vivo, the serum level of sSIRPα increased significantly (p < 0.0001) after an LPS challenge in humans. The median concentration in healthy individuals was 28.7 µg/L (19.8−41.1, 95% reference interval), and 20.5 µg/L in an IFCC certified serum reference material. The protein was stable in serum for prolonged storage and repeated freeze/thawing. Conclusions: We demonstrate that sSIRPα is produced constitutively and the concentration increases upon macrophage activation both in vitro and in vivo. It is present in human serum where it may function as a biomarker for the activity of tumor-associated macrophages (TAMs), and for monitoring the effect of immunotherapy.
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