Addressing Epigenetic Changes Associated With Fibroblast Phenotypes Associated With Cancer In Lung Cancer

Journal of Cancer and Tumor Research Addressing Epigenetic Changes Associated With Fibroblast Phenotypes Associated With Cancer In Lung Cancer. *Corresponding Author: Athaenasios G. Papavasiusiliou National University of Singapore. Received: 03-Jan-2025, ; Editor Assigned: 04-Jan-2025 ; Reviewed: 16-Jan-2025, ; Published: 22-Jan-2025, Citation: Athaenasios G. Papavasiusiliou. Addressing Epigenetic Changes Associated With Fibroblast Phenotypes Associated With Cancer In Lung Cancer. Journal of Cancer and Tumor Research. 2025 January; 1(1). Copyright © 2025 Athaenasios G. Papavasiusiliou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Editorial Kostaeds A.Papavassesiliou, Amaliewa A. Sofedfianidi,Vassiliki A.Gogou And Athaenasios G.Papavasiusiliou. National University of Singapore. www.directivepublications.org INTRODUCTION Tumor microenvironment (TME) emphasis has lately replaced tumor-centricity as the primary focus of cancer research and treatment [1]. Malignant cells, immune cells, stromal cells, blood and lymph vessels, neuron fibers, extracellular matrix (ECM), and other acellular components make up the TME, which is a dynamic ecosystem [1]. Among these, fibroblasts that proliferate in the tumor microenvironment (TME)— now known as cancer-associated fibroblasts, or CAFs—have become important participants in tumor biology [2].In fact, CAFs are a very diverse cell population, with differences in their origins, molecular characteristics, and unique epigenetic profiles [3–4]. Epigenetic changes have recently been identified as key regulators of CAF heterogeneity and activation [4]. Surprisingly, Hanahan unveiled the revised hallmarks of cancer in 2022, highlighting the crucial part epigenetic modifications play in obtaining hallmark characteristics throughout tumor growth and progression [5]. Although CAFs have been found to contain genetic changes, this kind of fibroblast is often more genetically stable than tumor cells [6]. Nonetheless, the tumor-promoting characteristics of CAFs are significantly altered by epigenetic changes. Three primary categories of epigenetic regulatory mechanisms impact CAFs: non-coding RNAs (ncRNAs), DNA methylation, and histone modification (i.e., post-translational covalent modifications to histone tails that alter the structural state of chromatin, thereby the transcriptional status of genes within specific locations) [7].More precisely, lung cancer CAFs seem to have both targeted hypermethylation of important transcription factors such as SMAD3 and general hypomethylation [7]. Furthermore, a poor prognosis for individuals with non- small-cell lung cancer (NSCLC) is linked to overexpression of N-methyltransferases, metabolic enzymes that control cell metabolism and cause epigenetic changes [7, 8]. Regarding ncRNA changes in CAFs, it has been determined that a variety of microRNAs (miRNAs) are either increased or downregulated in lung cancer, which causes CAFs to have a phenotype that promotes tumor growth [7]. Notably, transforming growth factor beta (TGF-β) and other cytokines have been identified as important mediators of the aforementioned epigenetic modifications [7].Because epigenetic alterations may be reversible, therapies that target them hold greater promise than those that only focus on finding novel treatment approaches that target genome mutations [9]. The antitumor potential of HDAC inhibitors has long been known, and deregulated histone deacetylases (HDACs)—enzymes that remove an acetyl group from histone lysine residues, typically resulting in transcriptional inactivation of the involved DNA due to chromatin condensation—have been strongly linked to aberrant gene silencing and carcinogenesis [10]. Since HDACs play an abnormal role in the development of NSCLC [11], inhibiting these enzymes offers a viable treatment approach against CAFs in solid tumors. Notably, preclinical therapeutic benefits against activated CAFs in breast cancer and melanoma have been demonstrated by the HDAC inhibitor scriptaid (6-(1,3-dioxo-1H-benzo[de]isoquinolin-2- yl)N-hydroxyhexanamide) [12]. Suberoylanilide hydroxamic acid (SAHA), also marketed as Vorinostat, is a derivative of scriptaid that has not yet entered clinical trials; however, it has been tested in NSCLC clinical trials in conjunction with other chemotherapeutic agents [13] and the inhibitor of programmed cell death protein 1 (PD-1) pembrolizumab [14]. These trials have demonstrated that adding vorinostat to combination regimens improves treatment efficacy and increases patient survival.Similarly, fimepinostat (CUDC-907),

Directive Publications Athaenasios G. Papavasiusiliou a tiny chemical that may be taken orally and functions as a dual inhibitor of HDAC and phosphoinositide 3-kinase (PI3K) class I isoforms,has proven to be effective in inhibiting the growth of cancer cells, decreasing the synthesis of collagen and extracellular matrix, and limiting the migration and invasion potential of CAFs in vivo in models of non-small cell lung cancer [15]. Clinical trials are now being conducted to evaluate the effectiveness of HDAC inhibitors in action. In patients with metastatic non-small cell lung cancer (NSCLC), NCT01928576 is a phase-II research of epigenetic therapy that includes azacytidine, a cytotoxic nucleoside analog, and entinostat, a synthetic benzamide-derivative HDAC inhibitor, together with concurrent administration of the PD-1 inhibitor nivolumab. For advanced or metastatic non-small cell lung cancer, the oral bioavailable class-I selective HDAC inhibitor tucidinostat (HBI-8000) is being evaluated in conjunction with nivolumab in another phase-II trial, NCT05141357.In terms of miRNAs, LINC01614, a CAF-specific long noncoding RNA (lncRNA), improves the glutamine absorption of CAFs in the TME and is linked to a bad prognosis for patients with lung cancer [16]. The ability for lung cancer to spread in vivo was greatly decreased by the deletion of LINC01614, indicating new avenues for epigenetic therapy that targets miRNAs [16]. Additionally, because SMAD3 plays a significant role in determining the epigenetic profile of lung cancer CAFs, preclinical models have shown promising therapeutic outcomes in lung cancer using the SMAD3 inhibitor SIS3, a pyrrolopyridine that specifically inhibits TGF-β1-dependent SMAD3 phosphorylation [17]. Targeting this paracrine signaling component could be the focus of efforts because TGF-β is important in shaping the epigenetic landscape of CAFs. When galunisertib was used in conjunction with nivolumab, no patients were discovered to have anti-nivolumab antibodies, which is encouraging for the best possible use of immunotherapy in NSCLC [19]. It has been studied in phase-I and -II trials that enrolled patients with NSCLC with positive results. Furthermore, Shi et al. found that the growth of CAFs linked to squamous cell carcinoma (SCC) was inhibited in vivo by LY2109761, a strong and oral TGFβR1 inhibitor [20]. Finally, hydroxychloroquine- induced autophagy suppression prevented TGF-β synthesis and CAF activation, which hindered the growth of lung adenocarcinoma [21].In summary, Stephen Paget’s timeless “seed and soil” hypothesis of cancer, which highlights the critical function of the TME, particularly CAFs, in tumor growth and progression, is still incredibly relevant today [22].We must develop and improve our therapeutic approaches if we are to successfully fight cancer and reduce the mortality that comes with it. In this continuous battle, focusing on the reversible epigenetic landscape of CAFs is a promising strategy. Luo et al. recently showed that the expression of the leucine rich repeat containing 3B (LRRC3B) gene, a tumor suppressor gene involved in the antitumor immune microenvironment, and the related DNA methylation at the LRRC3B promoter region may function as a useful predictive biomarker for anti-PD-1 therapy in NSCLC patients [23]. This suggests that the epigenetic profile of CAFs has even more potential value. I hope that future research will clarify the revolutionary potential of addressing epigenetic modifications in different TME components, particularly CAFs, opening the door to innovations in reducing lung cancer. Author Contributions:Conceptualization (K.A.P., A.A.S., and A.G.P.); writing (K.A.P., A.A.S., and V.A.G.); literature search and reference preparation (A.A.S. and V.A.G.); supervision (A.G.P.); writing (review and editing), K.A.P., A.A.P., and A.G.P. The published version of the manuscript has been read and approved by all authors. Funding There was no outside support for this study. Conflicts of Interest: No conflicts of interest are disclosed by the writers. REFERENCES 1. Jin, M.-Z.; Jin, W.-L. The Updated Landscape of Tumor Microenvironment and Drug Repurposing. Signal Transduct.Target.Ther.2020,5, 166. [CrossRef] [PubMed] 2. Wright, K.; Ly, T.; Kriet, M.; Czirok, A.; Thomas, S.M. 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