Idiopathic pulmonary fibrosis, a relentlessly progressive and fatal scarring disease of the lungs, has long frustrated clinicians with only two approved drugs that slow but cannot reverse its course. Now, a team of researchers in Taiwan has identified a surprising new player in the disease’s destructive machinery: doublecortin-like kinase 1, or DCLK1, a kinase better known for its role in cancer stem cells. Their study, published in the Journal of Biomedical Science, demonstrates that DCLK1 drives fibroblast activation in the lung and that blocking it—either genetically or with an oral inhibitor—slows fibrosis and preserves lung function in mice. The findings position DCLK1 as a promising therapeutic target in one of medicine’s most stubborn diseases.

The research, led by Lee-Yuan Lin, Wun-Hao Cheng, Chien-Huang Lin and Bing-Chang Chen of Taipei Medical University, together with collaborators at National Taiwan University Hospital and Universitas Gadjah Mada, began with a question that has lingered in the literature. Gene expression analyses had previously hinted that DCLK1 might be implicated in IPF, and earlier work reported that the kinase is markedly enhanced in the alveolar epithelial cells of patients with pulmonary fibrosis and in mice with bleomycin-induced fibrosis. But its function in fibroblast activation—the cellular engine of fibrosis—had remained unexplained.

To begin untangling that role, the team mined a publicly available single-cell RNA sequencing data set containing more than 312,000 cells from healthy lungs, IPF lungs, and lungs with chronic obstructive pulmonary disease. After stringent quality control filtering, they focused on roughly 240,000 cells from the control and IPF groups and mapped DCLK1 expression across the major lung cell lineages: epithelial, endothelial, lymphoid, myeloid, and stromal cells. The signal was unmistakable. DCLK1 was expressed across many cell populations, but the highest expression appeared in the stromal compartment, particularly in myofibroblasts—the specialized, contractile fibroblasts that churn out the extracellular matrix and stiffen lung tissue in IPF.

Human tissue told the same story. The researchers examined lung samples from eleven patients with IPF, obtained during lung transplantation or surgery, alongside fourteen nonfibrotic control samples. Histological staining with hematoxylin and eosin and Masson trichrome confirmed the expected picture of interstitial consolidation and collagen deposition in the IPF specimens. More importantly, immunohistochemistry revealed that both total DCLK1 and its phosphorylated, activated form were significantly upregulated in the fibrotic lung interstitium compared with control tissue. DCLK1, in other words, was not merely present in scarred lungs—it was switched on.

DCLK1 is an intriguing molecule to find at the center of a fibrotic process. It is a serine/threonine kinase belonging to the calcium/calmodulin-dependent kinase family, distinguished by two microtubule-binding domains. In oncology, DCLK1 overexpression has been documented in colorectal, pancreatic, gastric, renal, and hepatocellular carcinomas, where it correlates with poor prognosis, high recurrence, and metastasis, promoting tumor initiation and the epithelial–mesenchymal transition in cancer stem cells. It has also been linked to inflammatory signaling in SARS-CoV-2 infection, where inhibiting it blocks proinflammatory caspase-1/interleukin-1β signaling. The new study extends this portfolio of mischief to the fibrotic lung.

To test causality rather than mere correlation, the researchers turned to mice. They crossed animals carrying loxP sites flanking exon 3 of the DCLK1 locus with Pgk1-RFP-Cre/ERT2 transgenic mice, generating a system in which tamoxifen administration triggers global deletion of the Dclk1 gene. When these DCLK1 knockout mice and littermate controls were given intratracheal bleomycin, a chemotherapy drug used to induce pulmonary fibrosis in laboratory animals, the difference was striking. Knockout mice showed far less lung infiltration and collagen deposition, reduced numbers of cells staining positive for DCLK1 together with fibroblast surface protein and alpha-smooth muscle actin, and significantly lower levels of the profibrotic proteins fibronectin, α-SMA, and connective tissue growth factor, or CTGF.

The protective effect extended well beyond molecular markers. Using the FlexiVent FX system to measure lung mechanics, the team found that bleomycin treatment significantly reduced respiratory system compliance and pressure–volume performance and increased the normalized work of breathing in control mice—hallmarks of a stiffening, fibrotic lung. In the DCLK1 knockout animals, these functional deficits were substantially attenuated. In vivo microcomputed tomography, acquired at 34.75-micrometer voxel resolution, painted the morphological counterpart: bleomycin caused parenchymal destruction and volume loss in control lungs, while knockout mice retained lung structure and volume. Density histograms shifted toward fibrotic tissue in wild-type animals but stayed largely preserved in the knockouts, and peripheral blood neutrophil percentages, which climbed after bleomycin injury, were significantly reduced in the knockout group.

With the in vivo evidence established, the investigators dissected the molecular wiring in cultured normal human lung fibroblasts. Transforming growth factor beta, the master profibrotic cytokine, induced DCLK1 phosphorylation within 30 minutes and DCLK1 expression within 8 hours. Chromatin immunoprecipitation assays showed that after TGF-β stimulation, both Smad3—the canonical transcriptional mediator of TGF-β signaling—and the nuclear factor kappa B subunit p65 enriched at the DCLK1 promoter, indicating that TGF-β switches on DCLK1 through both Smad-dependent and noncanonical NF-κB pathways. Silencing DCLK1 with small interfering RNA then blunted the fibroblast’s profibrotic response, reducing TGF-β-induced expression of fibronectin, collagen 1A1, α-SMA, and CTGF.

The pathway, however, does not stop there. The team found that TGF-β also phosphorylated Akt, and that transfecting fibroblasts with a dominant-negative Akt construct reduced TGF-β-induced DCLK1 phosphorylation and the expression of fibronectin and CTGF—placing Akt upstream of DCLK1. Downstream, DCLK1 knockdown reduced Smad3 phosphorylation while DCLK1 overexpression enhanced it. Coimmunoprecipitation revealed a physical association between DCLK1 and Smad3, and immunofluorescence microscopy showed the two proteins colocalizing in the nucleus within 30 minutes of TGF-β treatment. A ChIP assay using a DCLK1 antibody pulled down DNA from the Smad3-binding region of the CTGF promoter, and pretreatment with the selective DCLK1 inhibitor DCLK1-IN-1 reduced TGF-β-induced CTGF expression. Together, the results sketch an Akt/DCLK1/Smad3 axis through which TGF-β drives the production of connective tissue growth factor, a potent profibrotic mediator.

The clinical payoff came in the pharmacological arm of the study. Mice receiving oral DCLK1-IN-1 at 10 milligrams per kilogram daily, beginning on day 7 after bleomycin instillation and continuing until day 28, showed visibly reduced fibrotic progression on histology, lower expression of fibronectin, α-SMA, and CTGF in lung tissue and lysates, preserved pulmonary compliance, improved pressure–volume loops, and reduced work of breathing. Serial microCT scans on days 7, 17, and 27 documented less severe fibrotic remodeling in the treated animals, with lung attenuation histograms showing a smaller fraction of dense, nonaerated voxels. Blood neutrophil counts were also lower. In short, a pill-like oral inhibitor measurably slowed the disease in a model that mirrors the human condition.

The implications are significant because the current therapeutic landscape for IPF is so thin. Only nintedanib, a tyrosine kinase inhibitor targeting growth factor receptors, and pirfenidone, which suppresses TGF-β production and activity, are approved by the US Food and Drug Administration, and both merely slow progression. The recent failure of pamrevlumab, a monoclonal antibody against CTGF, in the phase 3 ZEPHYRUS-1 trial suggested that targeting downstream fibrotic end products alone may be insufficient—pointing to the value of upstream signaling regulators such as DCLK1. Adding to the appeal, a DCLK1 inhibitor has already been shown to prevent inflammatory responses in acute lung injury, hinting at dual anti-fibrotic and anti-inflammatory potential.

The authors are careful to note limitations. DCLK1 is expressed across multiple lung cell types, and the tamoxifen-inducible knockout used here was global rather than cell-type-specific, so the contributions of fibroblasts versus epithelial, endothelial, and immune cells could not be fully separated. Human control tissue, as in most fibrosis studies, came from heterogeneous sources, including tumor-adjacent lung. The precise subcellular mechanics of the DCLK1–Smad3 interaction, whether DCLK1 inhibition can promote fibrosis resolution rather than merely slow progression, and the systemic safety of long-term DCLK1 blockade—all relevant given the kinase’s role in cancer and other processes—remain open questions.

Even so, the convergence of evidence is striking: DCLK1 is upregulated in human IPF, amplified in experimental fibrosis, mechanistically coupled to the TGF-β–Smad3 engine of fibroblast activation, and its suppression by both genetics and a small molecule preserves lung structure and function. What began as a cancer stem cell marker has now emerged, unexpectedly, as a central node in the scarring of the lung—offering fresh hope that a disease long considered irreversible may one day be stopped at its molecular source.

Lung adenocarcinoma is one of the most common forms of lung cancer and remains a major cause of cancer-related death worldwide. Although advances in imaging, molecular testing and targeted treatment have transformed care for some patients, the disease can behave very differently from one person to another. A new study published in the British Journal of Cancer is examining whether a protein called PDLIM2 could help explain that difference—and potentially become both a prognostic biomarker and a target for future therapies.

The research, led by Ashouri, Sun, Krause and colleagues, focuses on the biological and clinical significance of PDLIM2 in lung adenocarcinoma. A prognostic biomarker is a measurable feature that helps indicate how a disease may progress, including the likelihood of recurrence, treatment resistance or reduced survival. A therapeutic target, by contrast, is a molecule or pathway that can be manipulated with a drug or other intervention. The possibility that one protein could serve both roles makes PDLIM2 particularly interesting to cancer researchers.

PDLIM2 belongs to a family of proteins containing LIM domains, compact structural modules that help organize interactions between proteins. These proteins can act as molecular adaptors, bringing signaling components into the same cellular neighborhoods and influencing how cells respond to external stimuli. PDLIM2 has also been linked to the regulation of transcription factors, including nuclear factor kappa B, or NF-κB, a signaling regulator involved in inflammation, immune responses, cell survival and cancer biology. Because these processes are frequently altered in tumors, changes in PDLIM2 activity could have consequences extending far beyond a single cellular pathway.

Lung adenocarcinoma develops through the accumulation of genetic, epigenetic and environmental changes that allow abnormal cells to grow, invade surrounding tissue and spread to distant organs. Tumor cells also interact continuously with immune cells, connective tissue and blood vessels in their surrounding microenvironment. A protein such as PDLIM2 could influence cancer progression directly inside tumor cells or indirectly by altering inflammatory communication between the tumor and its surroundings. Understanding which of these possibilities is most important is essential before the protein can be considered a reliable clinical marker.

The investigators’ work explores whether PDLIM2 levels or activity are associated with meaningful features of lung adenocarcinoma. Such analyses typically compare molecular patterns in tumor and normal tissue, relate gene or protein expression to clinical outcomes, and examine whether a biomarker adds information beyond established factors such as tumor stage, histological characteristics and patient treatment. If PDLIM2 consistently tracks with disease behavior, it could eventually help doctors identify patients whose tumors require closer monitoring or more intensive treatment.

However, a biomarker is not automatically useful simply because it is statistically associated with cancer. For a molecule to become clinically valuable, researchers must establish how accurately and reproducibly it predicts outcomes, whether the result applies across different patient groups, and whether testing can be performed using practical samples and standardized methods. The distinction between correlation and causation is equally important. A high or low level of PDLIM2 may reflect an underlying cancer process without being responsible for it. The study’s therapeutic implications therefore depend on experimental evidence showing whether changing PDLIM2 can alter tumor-cell behavior.

The therapeutic-target question is especially challenging in lung adenocarcinoma, a disease that often contains several cancer-driving alterations at once. Targeted drugs against molecules such as EGFR, ALK, ROS1 and KRAS have produced significant benefits for selected patients, but resistance commonly emerges. Tumors can bypass blocked pathways, acquire new mutations or recruit protective signals from their microenvironment. If PDLIM2 participates in a separate or complementary network, targeting it could theoretically provide another way to disrupt tumor survival or progression. That possibility remains a research hypothesis requiring validation rather than an established treatment strategy.

Laboratory studies will be crucial for determining how PDLIM2 functions in different cellular contexts. Researchers may need to silence or increase the protein in lung adenocarcinoma models, monitor effects on proliferation, migration, invasion and cell death, and test whether PDLIM2 changes the response to existing therapies. Studies using animal models and patient-derived tumor systems could further reveal whether manipulating the protein affects tumor growth in a complex biological environment. At the same time, clinical datasets will be needed to establish whether PDLIM2 has independent prognostic value and whether it can support treatment decisions.

The appeal of the new research lies in its attempt to connect molecular biology with patient outcomes. Modern oncology increasingly depends on biomarkers that do more than describe a tumor; the most useful markers help predict what will happen and guide what should be done next. PDLIM2 could become part of that effort if future studies confirm its role across diverse populations and demonstrate that it can be measured reliably. For now, the work adds to a growing investigation into the signaling architecture of lung adenocarcinoma, where proteins once considered secondary components may hold clues to why some tumors remain controllable while others become aggressive and treatment-resistant.

Subject of Research: PDLIM2 as a prognostic biomarker and potential therapeutic target in lung adenocarcinoma.

Article Title: Exploring PDLIM2 as a prognostic biomarker and therapeutic target in lung adenocarcinoma.

Article References: Ashouri, K., Sun, F., Krause, H. et al. Exploring PDLIM2 as a prognostic biomarker and therapeutic target in lung adenocarcinoma. Br J Cancer (2026). https://doi.org/10.1038/s41416-026-03570-3

Image Credits: AI Generated

DOI: 10.1038/s41416-026-03570-3

Keywords: PDLIM2, lung adenocarcinoma, lung cancer, prognostic biomarker, therapeutic target, cancer signaling, precision oncology, NF-κB, molecular oncology