Research Background
Study Overview
Effective recovery from intestinal injury requires a carefully regulated balance between inflammation and tissue regeneration. Macrophages play a central role in this process: pro-inflammatory states help initiate immune defense, whereas inflammation-resolving states support epithelial repair. Persistent or excessive macrophage activation, however, can aggravate tissue damage and delay regeneration.
A study published in Proceedings of the National Academy of Sciences investigated how double PHD fingers 2 (DPF2), a subunit of the SWI/SNF chromatin-remodeling complex, regulates macrophage behavior during intestinal injury. The researchers examined whether DPF2 connects epigenetic regulation with calcium-dependent inflammatory signaling and assessed the relevance of this mechanism to radiation-induced intestinal injury and inflammatory bowel disease (IBD).
Study Design
An Integrated Multi-Scale Research Strategy
The researchers used genetic mouse models of radiation-induced intestinal injury, including bone marrow transplantation and cell type-specific deletion strategies, to determine where DPF2 exerts its effects. Single-cell RNA sequencing and spatial transcriptomics were then applied to characterize immune cell populations, inflammatory signals, regenerative programs, and the spatial distribution and developmental states of intestinal macrophages.
Epigenomic and molecular analyses, including chromatin accessibility profiling, CUT&RUN, intracellular calcium measurement, and protein signaling assays, were used to define the relationship among DPF2, CACNA1D expression, calcium signaling, and MAPK pathway activity.
To evaluate the potential relevance of the mechanism to human disease, the study also incorporated clinical IBD single-cell and spatial transcriptomic datasets, human intestinal organoid models, and clinical radiation enteritis samples.
Research Highlights
Key Findings
Macrophage DPF2 Loss Reduces Inflammation and Supports Intestinal Regeneration
In irradiated mouse models, reduced DPF2 activity was associated with less intestinal tissue damage, lower expression of inflammatory mediators, and improved regenerative responses. Cell type-specific experiments showed that the protective effect was linked primarily to DPF2 loss in immune cells, particularly macrophages.
Single-cell and spatial transcriptomic analyses further revealed that DPF2 deficiency altered macrophage polarization and spatial states within injured intestinal tissue. These changes were accompanied by reduced inflammatory signaling and greater representation of inflammation-resolving macrophage programs.
DPF2 Controls a CACNA1D–Calcium–MAPK Signaling Axis
Mechanistic analyses showed that DPF2 helps maintain enhancer activity at the Cacna1d locus. Loss of DPF2 reduced the enhancer-associated H3K27ac and H3K4me1 histone marks, lowered Cacna1d messenger RNA expression, and decreased intracellular calcium levels in macrophages.
The resulting reduction in calcium signaling attenuated MAPK pathway activity and promoted anti-inflammatory macrophage polarization. These findings connect chromatin remodeling directly with the signaling processes that shape macrophage inflammatory behavior during intestinal injury.
Human Data Support the Relevance of the DPF2–CACNA1D Axis
Analysis of clinical IBD single-cell and spatial transcriptomic datasets linked higher DPF2 and CACNA1D expression with pro-inflammatory macrophage characteristics and intestinal inflammation.
Human intestinal organoid experiments and clinical radiation enteritis samples provided additional evidence of a positive relationship among DPF2, CACNA1D, and inflammatory activity. Together, these observations support the potential translational relevance of the pathway while underscoring the need for further functional and clinical validation.
Research Significance
Implications for Intestinal Injury and Inflammatory Disease
This study identifies DPF2 as an epigenetic regulator that connects chromatin state with calcium-dependent MAPK signaling in macrophages. By positioning the DPF2–CACNA1D axis upstream of inflammatory polarization, the findings provide a more detailed mechanistic framework for understanding how immune responses influence intestinal damage and regeneration.
The pathway may offer a potential direction for future research into radiation-induced intestinal injury and IBD. However, the therapeutic implications remain exploratory: additional studies will be required to assess target specificity, safety, and clinical effectiveness before DPF2- or CACNA1D-directed strategies can be considered for patient care.
BMKGENE Contribution
Supporting Spatial Analysis of the Intestinal Immune Microenvironment
BMKGENE provided BMKMANU S3000 spatial transcriptomics sequencing services for this study. The spatially resolved transcriptomic data supported the mapping of intestinal cell populations, inflammatory genes, biological pathways, and macrophage states across injured tissue.
By preserving tissue context alongside gene expression information, the analysis helped connect DPF2-dependent molecular changes with the organization of the intestinal immune microenvironment and regenerative response.
BMKMANU S3000 Spatial Transcriptomics
Original Publication
Ji, M., Liang, H., Dong, S., et al. The SWI/SNF chromatin-remodeling subunit DPF2 regulates macrophage inflammation in intestinal injury via the CACNA1D-mediated MAPK pathway. Proceedings of the National Academy of Sciences of the United States of America 122(46), e2518762122 (2025). DOI: 10.1073/pnas.2518762122.
Post time: Sep-04-2026
