» Articles » PMID: 34686867

Tumor-induced Reshuffling of Lipid Composition on the Endoplasmic Reticulum Membrane Sustains Macrophage Survival and Pro-tumorigenic Activity

Abstract

Tumor-associated macrophages (TAMs) display pro-tumorigenic phenotypes for supporting tumor progression in response to microenvironmental cues imposed by tumor and stromal cells. However, the underlying mechanisms by which tumor cells instruct TAM behavior remain elusive. Here, we uncover that tumor-cell-derived glucosylceramide stimulated unconventional endoplasmic reticulum (ER) stress responses by inducing reshuffling of lipid composition and saturation on the ER membrane in macrophages, which induced IRE1-mediated spliced XBP1 production and STAT3 activation. The cooperation of spliced XBP1 and STAT3 reinforced the pro-tumorigenic phenotype and expression of immunosuppressive genes. Ablation of XBP1 expression with genetic manipulation or ameliorating ER stress responses by facilitating LPCAT3-mediated incorporation of unsaturated lipids to the phosphatidylcholine hampered pro-tumorigenic phenotype and survival in TAMs. Together, we uncover the unexpected roles of tumor-cell-produced lipids that simultaneously orchestrate macrophage polarization and survival in tumors via induction of ER stress responses and reveal therapeutic targets for sustaining host antitumor immunity.

Citing Articles

Interferon-driven Metabolic Reprogramming and Tumor Microenvironment Remodeling.

Chang T, Ho P Immune Netw. 2025; 25(1):e8.

PMID: 40078784 PMC: 11896656. DOI: 10.4110/in.2025.25.e8.


Myeloid cells: key players in tumor microenvironments.

Hua Q, Li Z, Weng Y, Wu Y, Zheng L Front Med. 2025; .

PMID: 40048137 DOI: 10.1007/s11684-025-1124-8.


Endoplasmic Reticulum Stress: Triggers Microenvironmental Regulation and Drives Tumor Evolution.

Peng C, Wang J, Wang S, Zhao Y, Wang H, Wang Y Cancer Med. 2025; 14(5):e70684.

PMID: 40035165 PMC: 11877002. DOI: 10.1002/cam4.70684.


The Role of Macrophages in Various Types of Tumors and the Possibility of Their Use as Targets for Antitumor Therapy.

Jumaniyazova E, Lokhonina A, Dzhalilova D, Miroshnichenko E, Kosyreva A, Fatkhudinov T Cancers (Basel). 2025; 17(3).

PMID: 39941714 PMC: 11815841. DOI: 10.3390/cancers17030342.


Noninvasive in vivo imaging of macrophages: understanding tumor microenvironments and delivery of therapeutics.

Gangadaran P, Onkar A, Rajendran R, Goenka A, Oh J, Khan F Biomark Res. 2025; 13(1):20.

PMID: 39865337 PMC: 11770947. DOI: 10.1186/s40364-025-00735-9.


References
1.
Lopez-Yrigoyen M, Cassetta L, Pollard J . Macrophage targeting in cancer. Ann N Y Acad Sci. 2020; 1499(1):18-41. DOI: 10.1111/nyas.14377. View

2.
Loke P, Allison J . PD-L1 and PD-L2 are differentially regulated by Th1 and Th2 cells. Proc Natl Acad Sci U S A. 2003; 100(9):5336-41. PMC: 154346. DOI: 10.1073/pnas.0931259100. View

3.
Laoui D, Van Overmeire E, Di Conza G, Aldeni C, Keirsse J, Morias Y . Tumor hypoxia does not drive differentiation of tumor-associated macrophages but rather fine-tunes the M2-like macrophage population. Cancer Res. 2013; 74(1):24-30. DOI: 10.1158/0008-5472.CAN-13-1196. View

4.
Qian B, Pollard J . Macrophage diversity enhances tumor progression and metastasis. Cell. 2010; 141(1):39-51. PMC: 4994190. DOI: 10.1016/j.cell.2010.03.014. View

5.
Wenes M, Shang M, Di Matteo M, Goveia J, Martin-Perez R, Serneels J . Macrophage Metabolism Controls Tumor Blood Vessel Morphogenesis and Metastasis. Cell Metab. 2016; 24(5):701-715. DOI: 10.1016/j.cmet.2016.09.008. View