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The bm12 Inducible Model of Systemic Lupus Erythematosus SLE in C57BL/6 Mice

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[Why C-reactive protein is (usually) not high in SLE].

Erik Klapproth¹, Martyna Hempel², Nicolai Leuchten^2,3

¹Institut für Pharmakologie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland.

Zeitschrift Fur Rheumatologie

|January 27, 2026

Summary

This summary is machine-generated.

High C-reactive protein (CRP) in lupus typically signals infection, not disease activity. This is because interferon-alpha (IFNα) causes interleukin-6 (IL-6) receptors to shed, buffering IL-6 and preventing CRP production.

Keywords:

Cytokine receptors Interferons, type 1 Interleukin‑6 Shedding Systemic lupus erythematosus

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Area of Science:

Immunology
Rheumatology
Biochemistry

Background:

Elevated C-reactive protein (CRP) in systemic lupus erythematosus (SLE) often indicates infection rather than active disease.
Interleukin-6 (IL-6) is a key stimulator of CRP, and its levels are typically high during active SLE, posing an intriguing paradox.

Purpose of the Study:

To elucidate the mechanism behind the dissociation of high IL-6 levels and normal CRP levels in active SLE.
To explain why CRP is a more reliable marker for bacterial infections than for SLE disease activity.

Main Methods:

Investigated the interaction between IL-6 and interferon-alpha (IFNα) in the context of SLE.
Examined the shedding of the IL-6 receptor from cell membranes.
Assessed the buffering capacity of soluble IL-6 receptors in plasma.

Main Results:

Interferon-alpha (IFNα) in combination with IL-6 induces the enzymatic cleavage and shedding of the IL-6 receptor from cell membranes.
These soluble IL-6 receptors act as a buffer, inhibiting IL-6's biological activity in plasma.
This buffering effect prevents IL-6 from stimulating hepatocytes to produce CRP, even when IL-6 levels are elevated in SLE.

Conclusions:

The shedding of IL-6 receptors, triggered by IFNα and IL-6, explains the uncoupling of IL-6 and CRP levels in SLE.
CRP production is only observed when IL-6 levels are extremely high, exceeding the buffering capacity, which typically occurs during severe infections or rarely in lupus serositis or arthritis.