What does this research mean for the field?

Silica-induced pulmonary fibrosis is driven by a TGF-β-independent macrophage-fibroblast circuit involving Activin A and reciprocal growth factor signaling, distinct from the traditional TGF-β-dependent pathways observed in bleomycin-induced fibrosis. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

This research aims to investigate the role of distinct macrophage activation states in pulmonary fibrosis induced by silica and bleomycin.

May 20, 2026American Journal of Respiratory and Critical Care Medicine

C29-20 Context-Specific Macrophage Programs in Silica and Bleomycin-Induced Models of Pulmonary Fibrosis

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Authors

CMC Molina TTT Tsukui DSD Sheppard

Discussion

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Overview

Randomized trial uncovers distinct macrophage programs in pulmonary fibrosis, indicating new therapeutic targets.

Key Points

This research aims to investigate the role of distinct macrophage activation states in pulmonary fibrosis induced by silica and bleomycin.
Performed single-cell RNA sequencing of lung cells from silica-exposed and untreated mice.
Integrated dataset with a public myeloid cell atlas from bleomycin-injury.
Used EdU pulse-labeling for confocal imaging to define proliferative niches.
Identified Spp1+ macrophages with different transcriptional signatures in bleomycin vs silica models.
In silica injury, Spp1+ macrophages expressed Activin A and interferon response genes, indicating TGF-β-independent signaling pathways.
Established reciprocal signaling axes between activated fibroblasts and macrophages involving PDGFB, CSF1/IL34, and HGF.

Cite This Study

Molina et al. (2026) studied this question.

synapsesocial.com/papers/6a0d4f92f03e14405aa9adca https://doi.org/10.1093/ajrccm/aamag162.2647

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May 20, 2026American Journal of Respiratory and Critical Care Medicine

C29-20 Context-Specific Macrophage Programs in Silica and Bleomycin-Induced Models of Pulmonary Fibrosis

View Full Paper

Ask AI

Bookmark

Authors

CMC Molina TTT Tsukui DSD Sheppard

Discussion

Member takes

Overview

Randomized trial uncovers distinct macrophage programs in pulmonary fibrosis, indicating new therapeutic targets.

Key Points

This research aims to investigate the role of distinct macrophage activation states in pulmonary fibrosis induced by silica and bleomycin.
Performed single-cell RNA sequencing of lung cells from silica-exposed and untreated mice.
Integrated dataset with a public myeloid cell atlas from bleomycin-injury.
Used EdU pulse-labeling for confocal imaging to define proliferative niches.
Identified Spp1+ macrophages with different transcriptional signatures in bleomycin vs silica models.
In silica injury, Spp1+ macrophages expressed Activin A and interferon response genes, indicating TGF-β-independent signaling pathways.
Established reciprocal signaling axes between activated fibroblasts and macrophages involving PDGFB, CSF1/IL34, and HGF.

Cite This Study

Molina et al. (2026) studied this question.

synapsesocial.com/papers/6a0d4f92f03e14405aa9adca https://doi.org/10.1093/ajrccm/aamag162.2647

View Full Paper

Ask AI

Bookmark