Lactate was traditionally considered metabolic waste formed during anaerobic glycolysis, particularly abundant in the hypoxic microenvironment of tumors. However, recent evidence, as thoroughly compiled in this review, positions lactate as a metabolic sentinel capable of remodeling chromatin architecture through lactylation — the covalent attachment of lactyl groups to lysine residues on histones and other proteins. This epigenetic modification alters gene expression patterns and contributes to oncogenic reprogramming that underpins lung cancer malignancy.

The review delineates a sophisticated “reflex arc” regulatory framework for lactylation dynamics. Specific enzymes termed “writers,” including the acetyltransferase p300 and aminoacyl-tRNA synthetases AARS1 and AARS2, are responsible for sensing intracellular lactate levels and catalyzing the addition of lactyl groups to target proteins. Conversely, “eraser” enzymes such as various histone deacetylases (HDACs) and sirtuins (SIRT1 and SIRT3) remove these lactyl modifications, thus enabling a dynamic and reversible regulatory system. The “readers,” notably the chromatin remodeler BRG1, recognize lactyl marks and modulate downstream transcriptional programs essential for tumor growth and adaptation.

Within lung cancer pathology, histone H3 lactylation at lysine 18 (H3K18la) emerges as a pivotal epigenetic signal promoting immune evasion. In non-small cell lung cancer (NSCLC), this modification activates the POM121/MYC/PD-L1 axis, facilitating immune checkpoint upregulation that allows tumor cells to subvert cytotoxic T cell responses. In small cell lung cancer (SCLC), a distinct mechanistic pathway involving LDH-mediated H3K18 lactylation influences the Nur77 nuclear receptor, further sculpting cell fate decisions toward resistance and survival.

The authors emphasize the presence of self-reinforcing feedback loops that sustain oncogenic lactylation signaling. For instance, the CTHRC1 (collagen triple helix repeat containing 1) protein amplifies glycolytic flux and H3K18 lactylation, creating a metabolic-epigenetic cycle that perpetuates therapeutic resistance. Another intricate loop involving nicotinamide N-methyltransferase (NNMT), early growth response 1 (EGR1), and lactate production stabilizes an environment conducive to acquired resistance against epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs), a mainstay treatment for certain lung cancers.

This insight into lactylation as a metabolic-epigenetic nexus offers profound therapeutic implications. Targeting the enzymes responsible for lactyl mark deposition or removal presents an opportunity to reprogram tumor epigenetic states and reverse deleterious drug resistance phenotypes. Strategies that reduce lactate accumulation—either by inhibiting glycolytic enzymes or modulating tumor microenvironment acidity—may further disrupt lactylation-driven pathways, restoring sensitivity to existing treatments.

Yong Xu and colleagues advocate for integrating this novel lactylation paradigm into precision oncology frameworks. By designing therapies that specifically intercept lactylation writers, readers, or erasers, it may be possible to dismantle the molecular circuitry that empowers lung cancer cells to circumvent standard therapies. Such approaches could potentiate efficacy, delay relapse, and improve patient survival outcomes.

Furthermore, the review calls for intensified research into the nuanced interplay between metabolic rewiring and epigenetic modifications in cancer. Understanding how lactylation interfaces with other histone modifications and transcription factor networks will be vital to fully exploit this axis. The dynamic regulatory milieu uncovered here underscores cancer’s remarkable plasticity and the necessity for multi-modal treatment strategies.

As the role of lactate as an epigenetic modulator gains prominence, it challenges prior dogmas regarding metabolic byproducts in oncology. This review not only reframes lactate as a driver of malignancy but also spotlights the broader implications for tumor immunology and metabolic crosstalk within the tumor microenvironment.

In summary, the findings compiled by Xu’s team constitute a pivotal step toward unraveling the complex molecular architecture of lung cancer resistance mechanisms. By illuminating the centrality of lactylation in integrating metabolic signals with epigenetic control, this work charts a promising roadmap for innovative treatment modalities aimed at overcoming therapeutic resistance in lung cancer.

Subject of Research:
Role of lactylation in lung cancer progression and drug resistance.

Article Title:
Not explicitly provided.

News Publication Date:
Not explicitly provided.

Web References:
http://dx.doi.org/10.1016/j.cmp.2026.03.004

Keywords:
Lung cancer, lactylation, epigenetics, metabolism, drug resistance, H3K18la, tumor immune escape, EGFR-TKIs, lactate signaling, histone modifications.

Lung cancer’s mortality remains alarmingly high, largely due to its asymptomatic progression in early stages and resistance to conventional therapies once advanced. Understanding the molecular underpinnings that dictate tumor initiation and resilience is paramount. Biomolecular condensates, often described as dynamic, reversible clusters of proteins and nucleic acids, organize cellular biochemical reactions with astonishing spatial and temporal precision. These structures influence genetic and epigenetic landscapes, unveiling novel dimensions in cancer biology that could revolutionize clinical management.

Among the most captivating revelations is the role of the deubiquitinating enzyme USP42 in lung cancer. USP42 undergoes phase separation, orchestrating the spatial integration of spliceosome components like PLRG1 into nuclear speckles. This mechanism intricately governs the expression of cancer-related genes, including SS18 and the tumor suppressor LATS1 on chromosome 18. Such aberrations in phase separation dynamics offer a tantalizing prospect: they could serve as early molecular indicators of lung cancer before morphological changes become detectable, overcoming critical barriers in early diagnostics.

The tumor suppressor p53, a guardian of genomic integrity famously mutated in a majority of lung cancers, also participates in LLPS-dependent regulatory circuits. Under genomic stress, wild-type p53 forms condensates that amplify transcriptional activation of DNA repair and apoptotic genes. Intriguingly, oncogenic mutations disrupt p53’s ability to form these liquid-like assemblies, diminishing its function and promoting tumorigenesis. This altered phase behavior could serve as a pathological hallmark, providing clinicians with a biomarker modality intimately tied to cancer’s molecular pathology rather than conventional histology.

Adding complexity to this condensate landscape is the Yes-associated protein (YAP), a pivotal effector in the Hippo signaling pathway, widely implicated in non-small cell lung cancer (NSCLC). YAP’s nuclear translocation and subsequent phase separation potentiate its transcriptional activity, driving oncogene expression and aggressive tumor phenotypes. Detecting YAP nuclear condensates may thus offer a sensitive and specific biomarker for NSCLC progression, highlighting the dual diagnostic and prognostic promise of condensate biology.

Beyond diagnostics, drug resistance remains a formidable challenge in the clinical management of lung cancer. Recent research illuminates how biomolecular condensates contribute to this phenomenon by modulating drug pharmacokinetics and target engagement. For instance, transcriptional coactivators BRD4 and MED1 assemble into condensates at super-enhancer loci, concentrating transcription machinery to sustain oncogenic gene expression. Such condensates selectively sequester small-molecule drugs like cisplatin, revealing how phase-separated compartments alter therapeutic distribution and efficacy within cancer cells.

This discovery extends to hormone receptor biology, where mutant estrogen receptor alpha (ERα) proteins in lung cancer exhibit altered affinities for tamoxifen within MED1 condensates, correlating with drug resistance. The reduced drug binding within these condensates emphasizes the necessity for novel strategies targeting biomolecular phase behavior, potentially overcoming resistance mechanisms by disrupting pathological condensate formation.

Pioneering studies also explore androgen receptor (AR) variants in castration-resistant prostate cancer models, underscoring parallels in LLPS-mediated resistance. The antagonist enzalutamide disrupts wild-type AR aggregates yet paradoxically enhances LLPS in drug-resistant mutants, amplifying oncogenic signaling. High-throughput screens have identified compounds like ET516 that inhibit LLPS across mutant and wild-type receptors, heralding a new class of therapeutics targeting condensate dynamics — a strategy that lung cancer therapies might soon emulate.

The prognostic landscape is equally influenced by condensate biology. Fusion proteins such as EML4-ALK, prevalent in lung adenocarcinoma (LUAD), result from genetic rearrangements that perturb normal phase separation processes, serving as robust prognostic biomarkers with direct therapeutic relevance. Similarly, elevated expression of long non-coding RNAs like NEAT1, known to modulate phase-separated nuclear bodies, inversely correlates with patient survival, underscoring the prognostic significance of condensate-associated molecules.

Integrative bioinformatics approaches combine large-scale transcriptomic data from repositories like The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) with databases cataloging LLPS-prone proteins such as DrLLPS and PhaSepDB. These synergistic analyses have unveiled a subset of 17 LLPS-related genes among thousands of differentially expressed genes in LUAD, enriched in pathways governing condensate dynamics. Such gene signatures have successfully stratified patients by risk and survival outcomes, advancing precision medicine through condensate-informed biomolecular profiling.

Clinical translation of these insights benefits from unprecedented biological resolution. LLPS-focused research transcends traditional static snapshots of cellular states by revealing the biophysical principles that govern protein and nucleic acid compartmentalization in living cells. This paradigm shift equips researchers and clinicians with a molecular toolkit to characterize tumors not only by their genetic mutations but also by the dynamic biochemistry underpinning their phenotypes.

Harnessing this knowledge propels the development of innovative diagnostics that detect perturbations in biomolecular condensation earlier and with higher specificity than existing methods. Coupled with targeted therapies designed to modulate or disrupt pathological condensates, this approach promises to surmount current challenges posed by tumor heterogeneity and drug resistance.

Moreover, condensate biology offers fertile ground for the design of next-generation drug delivery platforms. By exploiting the selective partitioning properties of biomolecular condensates, therapeutic agents can be engineered to preferentially concentrate within malignant cell compartments, enhancing efficacy while minimizing off-target effects and systemic toxicity.

As the landscape of lung cancer research evolves, the interplay between molecular condensates and cancer biology emerges not only as a mechanistic curiosity but as a foundational principle with broad translational impact. The convergent efforts of molecular biology, biophysics, genomics, and pharmacology are revealing condensates as both sentinels and gatekeepers within the malignant cell, unlocking novel avenues for intervention.

In conclusion, the recognition that phase separation and biomolecular condensates are central to lung cancer pathogenesis marks a watershed moment in oncology. This revolutionary insight fuels hope for earlier diagnosis, precision therapeutics, and improved prognostic assessments. As research continues to decipher the complex language of these dynamic compartments, the promise of transforming lung cancer from a grim prognosis into a manageable condition inches closer to reality.

Subject of Research:
Biomolecular condensates and liquid-liquid phase separation in lung cancer mechanisms and therapeutic targeting.

Article Title:
Biomolecular condensates in lung cancer: from molecular mechanisms to therapeutic targeting.

Article References:
Wang, N., Liu, Q., Shang, L. et al. Biomolecular condensates in lung cancer: from molecular mechanisms to therapeutic targeting. Cell Death Discov. 11, 425 (2025). https://doi.org/10.1038/s41420-025-02735-y

Image Credits:
AI Generated

DOI:
https://doi.org/10.1038/s41420-025-02735-y