What is the clinical evidence from this study?

Study design: Observational. Population: Idiopathic inflammatory myopathies (IIMs) with myocarditis (n=12). Intervention: Myocarditis vs. Myositis without myocarditis. Primary outcome: Proportion of memory B cells (β = -1.04, p=FDR = 0.02).

What does this research mean for the field?

Myocarditis in idiopathic inflammatory myopathies is associated with peripheral dysregulation characterized by naive B cell activation and hyperactivated, low-proliferative natural killer cells. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To elucidate the immunologic mechanisms and peripheral blood cellular alterations driving myocarditis in patients with idiopathic inflammatory myopathies.

September 19, 2026ACR Open RheumatologyOpen Access

Myositis with myocarditis is linked to fewer memory B cells and altered NK cell pathways.

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Why the study?

The immunologic processes driving myocarditis in idiopathic inflammatory myopathies are poorly understood.

Population

12 individuals: myositis with myocarditis (n=4), myositis without myocarditis (n=4), healthy controls (n=4)

Comparison

Myositis with myocarditis vs myositis without myocarditis and healthy controls

Design

Single-cell RNA sequencing observational study

Key result

Myositis with myocarditis was associated with a smaller proportion of memory B cells (β = -1.04, FDR = 0.02) and altered NK cell pathways compared to myositis without myocarditis.

Authors

CDCarolina Duque SRSylvie Rousseau ZBZuzana Bologna

Discussion

Member takes

Overview

Does not yet inform management of myositis myocarditis; hypothesis-generating for B- and NK-cell roles in larger cohorts.

Key Points

To elucidate the immunologic mechanisms and peripheral blood cellular alterations driving myocarditis in patients with idiopathic inflammatory myopathies.
Performed single-cell RNA sequencing on peripheral blood mononuclear cells from 12 individuals.
Compared profiles across three clinical groups (N=12): myositis with myocarditis (n = 4), myositis without myocarditis (n = 4), and healthy controls (n = 4).
B cells in myositis with myocarditis exhibited 42 enriched pathways related to DNA replication, somatic hypermutation, and lymphocyte activation, alongside a lower proportion of memory B cells (β = -1.04, false discovery rate = 0.02).
Natural killer cells displayed 223 enriched pathways showing decreased proliferation but increased effector functions, including leukocyte degranulation, myeloid cell activation, and tumor necrosis factor secretion.

Study Design

Type

Observational (n=12)

Structured PICO

Population

12 individuals including 4 with myositis and myocarditis, 4 with myositis without myocarditis, and 4 healthy controls.

Comparator

Myositis without myocarditis and healthy controls

Outcome

Immunologic alterations in peripheral blood mononuclear cells (specifically B cells and NK cells)surrogate

Main Result

Effect estimate: β = -1.04

p-value: p=FDR = 0.02

B cells and NK cells exhibit distinct activation and proliferation profiles in patients with idiopathic inflammatory myopathies complicated by myocarditis, suggesting a role in its pathogenesis.

Cite This Study

Duque et al. (2026) conducted an observational in Idiopathic inflammatory myopathies (IIMs) with myocarditis (n=12). Myocarditis vs. Myositis without myocarditis was evaluated on Proportion of memory B cells (β = -1.04, p=FDR = 0.02). Myositis with myocarditis was associated with a smaller proportion of memory B cells (β = -1.04, FDR = 0.02) and altered NK cell pathways compared to myositis without myocarditis.

synapsesocial.com/papers/6aae47640c69660b71ecc690 https://doi.org/10.1002/acr2.90147

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September 19, 2026ACR Open RheumatologyOpen Access

Myositis with myocarditis is linked to fewer memory B cells and altered NK cell pathways.

View Full Paper

Ask AI

Bookmark

Why the study?

The immunologic processes driving myocarditis in idiopathic inflammatory myopathies are poorly understood.

Population

12 individuals: myositis with myocarditis (n=4), myositis without myocarditis (n=4), healthy controls (n=4)

Comparison

Myositis with myocarditis vs myositis without myocarditis and healthy controls

Design

Single-cell RNA sequencing observational study

Key result

Myositis with myocarditis was associated with a smaller proportion of memory B cells (β = -1.04, FDR = 0.02) and altered NK cell pathways compared to myositis without myocarditis.

Authors

CDCarolina Duque SRSylvie Rousseau ZBZuzana Bologna

Discussion

Member takes

Overview

Does not yet inform management of myositis myocarditis; hypothesis-generating for B- and NK-cell roles in larger cohorts.

Key Points

To elucidate the immunologic mechanisms and peripheral blood cellular alterations driving myocarditis in patients with idiopathic inflammatory myopathies.
Performed single-cell RNA sequencing on peripheral blood mononuclear cells from 12 individuals.
Compared profiles across three clinical groups (N=12): myositis with myocarditis (n = 4), myositis without myocarditis (n = 4), and healthy controls (n = 4).
B cells in myositis with myocarditis exhibited 42 enriched pathways related to DNA replication, somatic hypermutation, and lymphocyte activation, alongside a lower proportion of memory B cells (β = -1.04, false discovery rate = 0.02).
Natural killer cells displayed 223 enriched pathways showing decreased proliferation but increased effector functions, including leukocyte degranulation, myeloid cell activation, and tumor necrosis factor secretion.

Study Design

Type

Observational (n=12)

Structured PICO

Population

12 individuals including 4 with myositis and myocarditis, 4 with myositis without myocarditis, and 4 healthy controls.

Comparator

Myositis without myocarditis and healthy controls

Outcome

Immunologic alterations in peripheral blood mononuclear cells (specifically B cells and NK cells)surrogate

Main Result

Effect estimate: β = -1.04

p-value: p=FDR = 0.02

B cells and NK cells exhibit distinct activation and proliferation profiles in patients with idiopathic inflammatory myopathies complicated by myocarditis, suggesting a role in its pathogenesis.

Cite This Study

synapsesocial.com/papers/6aae47640c69660b71ecc690 https://doi.org/10.1002/acr2.90147

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

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