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It emphasizes how RARRES2 modulates PTEN–mTOR–SREBP1 signaling to reshape lipid metabolites such as phosphatidylcholine and triacylglycerols, with RARRES2 knockdown increasing PC while decreasing TAGs. The commentary frames these results as clinically relevant, suggesting RARRES2 may serve as a predictive biomarker and a target for therapeutic strategies against brain metastasis.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/rarres2s-impact-on-lipid-metabolism-in-triple-negative-breast-cancer-a-pathway-to-brain-metastasis/377204/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/rarres2s-impact-on-lipid-metabolism-in-triple-negative-breast-cancer-a-pathway-to-brain-metastasis/377204.png","ImageObject",300,407,{"name":92,"@type":93},"Cart","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-01","2026-09-24",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What role does RARRES2 play in triple-negative breast cancer brain metastasis?","Question",{"text":112,"@type":113},"RARRES2 helps cancer cells adapt to the brain’s lipid-rich environment by regulating lipid metabolism. The commentary links this adaptation to changes in key lipid metabolites.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Which signaling pathway connects RARRES2 to lipid metabolic reprogramming?",{"text":117,"@type":113},"RARRES2 is described as modulating PTEN–mTOR–SREBP1 signaling. RARRES2 knockdown or overexpression alters protein levels along the PI3K/mTOR axis and downstream SREBP1 cleavage.",{"name":119,"@type":110,"acceptedAnswer":120},"How does RARRES2 knockdown affect phosphatidylcholine and triacylglycerols?",{"text":121,"@type":113},"RARRES2 knockdown increases phosphatidylcholine (PC) levels and decreases triacylglycerols (TAGs). This shift is used to support broader dysregulated brain lipid metabolism mechanisms.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},377204,1790865400,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":39},18829141979164,"https://eur-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Shubhra Military Medical Research (2023) 10:42 [https://doi.org/10.1186/s40779-023-00480-w](https://doi.org/10.1186/s40779-023-00480-w)  \nCOMMENTARY Open Access  \nRARRES2’s impact on lipid metabolism   in triple-negative breast cancer: a pathway to brain metastasis  \nQuaziT. H. Shubhra 1,2*  \nKeywords Retinoic acid receptor responder 2 (RARRES2), Lipid metabolism, Cancer, PTEN-mTOR-SREBP1 signaling, Metabolic reprogramming, Brain metastasis  \nBreast cancer brain metastasis (BCBrM) is a crucial and hard area of research which guarantees an urgent need to understand the underlying molecular mechanisms. A recent study by Li et al. [1] published in Military Medical Research investigated the role of retinoic acid receptor responder 2 (RARRES2) in regulating lipid metabolism in BCBrM, highlighting the clinical relevance of alterations in lipid metabolites, such as phosphatidylcholine (PC) and triacylglycerols (TAGs), by RARRES2 through the modulation of phosphatase and tensin homologue (PTEN)-mammalian target of rapamycin (mTOR)-sterol regulatory element-binding protein 1 (SREBP1) signaling pathway. This commentary aims to elaborate on the key findings and their relevance to the field.  \nAs the leading cause of death worldwide, cancer shows varied pathological progression and demands high treatment costs, posing a significant challenge to global health [2]. Breast cancer (BC), which accounted for the highest number of new diagnoses in 2020 (2.26 million new cases), exemplifies the complexity of the fight again  \nThis comment refers to the article available online at [https://doi.org/10.1186/](https://doi.org/10.1186/)[ ](https://doi.org/10.1186/)[s40779-023-00470-y](s40779-023-00470-y).  \n*Correspondence: QuaziT. H. Shubhra  \n[tanminul-haque-shubra.quazi@us.edu.pl](tanminul-haque-shubra.quazi@us.edu.pl); [shubhro.du@gmail.com](shubhro.du@gmail.com)  \n1 Institute of Chemistry, University of Silesia in Katowice, 41-500 Chorzów, Poland  \n2 Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan 430060, China  \ncancers. Among the subtypes of BC, triple-negative breast cancer (TNBC) is particularly aggressive, frequently metastasizing to the brain [3] and defying most existing treatment options. This makes the management of TNBC a formidable task, marked by its propensity for rapid metastasis and limited therapeutic avenues. In this landscape, the study by Li et al. [1] gains profound significance due to offering invaluable insights into the mechanisms that drive this cancer’s spread to the brain. The brain is unique because it’s made up of a lot of fats. The study dug deeper into how BC cells that spread to the brain adapt to this fatty environment. They found that a specific protein called RARRES2 helps these cancer cells fit into the brain by changing the way they handle fats. The research illuminates the potential role of RARRES2, not only as a predictive biomarker for metastasis but also as a key to unlocking novel therapeutic strategies for this relentless form of cancer.  \nIn addition, Li et al. [1] investigated the significant role of RARRES2 in regulating lipid metabolism within MDAMB-231 cells. This regulation appears to directly influence BCBrM. RARRES2 has been found to interfere with the biological processes of several key metabolites, particularly PC and TAGs. Interestingly, the knockdown of RARRES2 led to an increase in PC levels and a decrease in TAGs. This discovery is not merely of academic interest but reflects on the broader mechanisms underlying dysregulated brain’s lipid metabolism. The understanding of these mechanisms is essential to unraveling the  \n© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indi","cbCaiuOspyYhPgTk","https://ap.wps.com/l/cbCaiuOspyYhPgTk","pdf",778089,"English","# RARRES2 and lipid metabolism in breast cancer brain metastasis\n## Commentary overview and clinical relevance\n## Mechanistic links: PTEN–mTOR–SREBP1 signaling\n## Metabolite changes and implications for metastasis","[{\"question\":\"What role does RARRES2 play in triple-negative breast cancer brain metastasis?\",\"answer\":\"RARRES2 helps cancer cells adapt to the brain’s lipid-rich environment by regulating lipid metabolism. The commentary links this adaptation to changes in key lipid metabolites.\"},{\"question\":\"Which signaling pathway connects RARRES2 to lipid metabolic reprogramming?\",\"answer\":\"RARRES2 is described as modulating PTEN–mTOR–SREBP1 signaling. RARRES2 knockdown or overexpression alters protein levels along the PI3K/mTOR axis and downstream SREBP1 cleavage.\"},{\"question\":\"How does RARRES2 knockdown affect phosphatidylcholine and triacylglycerols?\",\"answer\":\"RARRES2 knockdown increases phosphatidylcholine (PC) levels and decreases triacylglycerols (TAGs). This shift is used to support broader dysregulated brain lipid metabolism mechanisms.\"}]","RARRES2’s Impact on Lipid Metabolism in Triple-Negative Breast Cancer - a Pathway to Brain Metastasis | PDF",1790223692]