Targeting tumor associated macrophages to alternate cancer stem cells and tumor microenvironment milieu
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Abstract
Macrophages in the tumor microenvironment are involved in promoting cancer growth and enabling it to evade therapies. By acting as something like a tumor's "underground," these cells dampen down the "calls for help" that chemotherapy or radiotherapy might otherwise trigger. They also appear to enable some cells in the cancers to reset themselves into cancer stem cells (CSCs), allowing them to divide and differentiate. Cancer stem cells are compelled to initiate tumors and maintain their growth. In part, the tumor-associated macrophages (TAMs) effect this by secreting cytokines with well-established roles in regulating stemness, as well as proteins that govern cell migration and are known to help keep CSCs in the niche where the tumor formed and maintain the tumor. Prognostic studies have found that TAMs are associated with worse patient outcomes. This article reviews the existing knowledge on TAMs in supporting the survival and maintenance of CSCs, increasing tumor resilience and resistance to therapy. We did a systematic review using the keywords CSC, TAM, tumor microenvironment (TME), and extracellular matrix remodeling from the following databases: ScienceDirect, PubMed, NCBI, Nature, Google Scholar, and Oxford Academic for articles published between 2010 to 2026. The underlying premise of the current investigation is that macrophages facilitate the maintenance of the "stemness" characteristics of CSCs. The TAM-CSC alliance must be interrupted to improve therapeutic outcomes and reduce tumor recurrence. Our review focuses on addressing the difficulties presented by CSCs and TME through advanced research techniques and specific combination treatments. This alternative method offers a less harsh and more effective therapy that will improve the patient’s outcomes by effectively eradicating tumor cells and modifying the tumor microenvironment to enhance the immune system's capability to combat the tumor.
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Hoeben A, Joosten EAJ, van den Beuken-van Everdingen MHJ. Personalized medicine: recent progress in cancer therapy. Cancers (Basel) 2021;13:242. doi:10.3390/cancers13020242.
2. Rangel-Sosa MM, Aguilar-Córdova E, Rojas-Martínez A. Immunotherapy and gene therapy as novel treatments for cancer. Colomb Med (Cali) 2017;48:138–47. doi:10.25100/cm.v48i3.2997.
3. Akbulut H. Immune gene therapy of cancer. Turkish J Med Sci 2020;50(SI-2):1679–90. doi:10.3906/sag-2005-327.
4. Delire B, De Martin E, Meunier L, Larrey D, Horsmans Y. Immunotherapy and gene therapy: new challenges in the diagnosis and management of drug-induced liver injury. Front Pharmacol 2021;12:786174. doi:10.3389/fphar.2021.786174.
5. Zafar A, Khan MJ, Abu J, Naeem A. Revolutionizing cancer care strategies: immunotherapy, gene therapy, and molecular targeted therapy. Mol Biol Rep 2024;51:219. doi:10.1007/s11033-023-09096-8.
6. McCabe A, MacNamara KC. Macrophages: key regulators of steady-state and demand-adapted hematopoiesis. Exp Hematol 2016;44:213–22. doi:10.1016/j.exphem.2016.01.003.
7. Dias AS, Almeida CR, Helguero LA, Duarte IF. Metabolic crosstalk in the breast cancer microenvironment. Eur J Cancer 2019;121:154–71. doi:10.1016/j.ejca.2019.09.002.
8. Sun HF, Li LD, Lao IW, et al. Single-cell RNA sequencing reveals cellular and molecular reprograming landscape of gliomas and lung cancer brain metastases. Clin Transl Med 2022;12:e1101. doi:10.1002/ctm2.1101.
9. Wang J, Zhu N, Su X, Gao Y, Yang R. Novel tumor-associated macrophage populations and subpopulations by single cell RNA sequencing. Front Immunol 2024;14:1264774. doi:10.3389/fimmu.2023.1264774.
10. Cortese N, Carriero R, Laghi L, Mantovani A, Marchesi F. Prognostic significance of tumor-associated macrophages: past, present and future. Semin Immunol 2020;48:101408. doi:10.1016/j.smim.2020.101408.
11. Ngambenjawong C, Gustafson HH, Pun SH. Progress in tumor-associated macrophage (TAM)-targeted therapeutics. Adv Drug Deliv Rev 2017;114:206–21. doi:10.1016/j.addr.2017.04.010.
12. Liu J, Geng X, Hou J, Wu G. New insights into M1/M2 macrophages: key modulators in cancer progression. Cancer Cell Int 2021;21:389. doi:10.1186/s12935-021-02089-2.
13. Gratchev A. TGF-β signalling in tumour associated macrophages. Immunobiology 2017;222:75–81. doi:https://doi.org/10.1016/j.imbio.2015.11.016.
14. Turati M, Mousset A, Issa N, Turtoi A, Ronca R. TGF-β mediated drug resistance in solid cancer. Cytokine Growth Factor Rev 2023;71–72:54–65. doi:10.1016/j.cytogfr.2023.04.001.
15. Chan MKK, Chung JYF, Tang PCT, et al. TGF-β signaling networks in the tumor microenvironment. Cancer Lett 2022;550:215925. doi:10.1016/j.canlet.2022.215925.
16. Wang X, Eichhorn PJA, Thiery JP. TGF-β, EMT, and resistance to anti-cancer treatment. Semin Cancer Biol 2023;97:1–11. doi:10.1016/j.semcancer.2023.10.004.
17. Ciardiello D, Elez E, Tabernero J, Seoane J. Clinical development of therapies targeting TGFβ: current knowledge and future perspectives. Ann Oncol 2020;31:1336–49. doi:10.1016/j.annonc.2020.07.009.
18. Griess B, Mir S, Datta K, Teoh-Fitzgerald M. Scavenging reactive oxygen species selectively inhibits M2 macrophage polarization and their pro-tumorigenic function in part, via Stat3 suppression. Free Radic Biol Med 2020;147:48–60. doi:10.1016/j.freeradbiomed.2019.12.018.
19. Gao J, Liang Y, Wang L. Shaping polarization of tumor-associated macrophages in cancer immunotherapy. Front Immunol 2022;13:888713. doi:10.3389/fimmu.2022.888713.
20. Dehne N, Mora J, Namgaladze D, Weigert A, Brüne B. Cancer cell and macrophage cross-talk in the tumor microenvironment. Curr Opin Pharmacol 2017;35:12–9. doi:10.1016/j.coph.2017.04.007.
21. Mao X, Xu J, Wang W, et al. Crosstalk between cancer-associated fibroblasts and immune cells in the tumor microenvironment: new findings and future perspectives. Mol Cancer 2021;20:131. doi:10.1186/s12943-021-01428-1.
22. Chen QY, Gao B, Tong D, Huang C. Crosstalk between extracellular vesicles and tumor-associated macrophage in the tumor microenvironment. Cancer Lett 2023;552:215979. doi:10.1016/j.canlet.2022.215979.
23. Hanahan D. Hallmarks of cancer: new dimensions. Cancer Discov 2022;12:31-46. doi:10.1158/2159-8290.CD-21-1059.
24. Bayik D, Lathia JD. Cancer stem cell-immune cell crosstalk in tumour progression. Nat Rev Cancer 2021;21:526–36. doi:10.1038/s41568-021-00366-w.
25. Gyamfi J, Eom M, Koo JS, Choi J. Multifaceted roles of interleukin-6 in adipocyte-breast cancer cell interaction. Transl Oncol 2018;11:275–85. doi:10.1016/j.tranon.2017.12.009.
26. Kerneur C, Cano CE, Olive D. Major pathways involved in macrophage polarization in cancer. Front Immunol 2022;13:1026954. doi:10.3389/fimmu.2022.1026954.
27. Khan T, Cabral H. Abnormal glycosylation of cancer stem cells and targeting strategies. Front Oncol 2021;11:649338. doi:10.3389/fonc.2021.649338.
28. Fujii J, Osaki T. Involvement of nitric oxide in protecting against radical species and autoregulation of M1-polarized macrophages through metabolic remodeling. Molecules 2023;28:814. doi:10.3390/molecules28020814.
29. Idelchik MDPS, Begley U, Begley TJ, Melendez JA. Mitochondrial ROS control of cancer. Semin Cancer Biol 2017;47:57–66. doi:10.1016/j.semcancer.2017.04.005.
30. Loureiro R, Mesquita KA, Magalhães-Novais S, Oliveira PJ, Vega-Naredo I. Mitochondrial biology in cancer stem cells. Semin Cancer Biol 2017;47:18–28. doi:10.1016/j.semcancer.2017.06.012.
31. Cendrowicz E, Sas Z, Bremer E, Rygiel TP. The role of macrophages in cancer development and therapy. Cancers (Basel) 2021;13:1946. doi:10.3390/cancers13081946.
32. López-Gil JC, Martin-Hijano L, Hermann PC, Sainz B Jr. The CXCL12 crossroads in cancer stem cells and their niche. Cancers (Basel) 2021;13:469. doi:10.3390/cancers13030469.
33. Yu PF, Huang Y, Xu CL, et al. Downregulation of CXCL12 in mesenchymal stromal cells by TGFβ promotes breast cancer metastasis. Oncogene 2017;36:840–9. doi:10.1038/onc.2016.252.
34. Chen P, Hsu WH, Han J, Xia Y, De Pinho RA. Cancer stemness meets immunity: from mechanism to therapy. Cell Rep 2021;34:108597. doi:10.1016/j.celrep.2020.108597.
35. Nath N, Kashfi K. Tumor associated macrophages and ‘NO’. Biochem Pharmacol 2020;176:113899. doi:10.1016/j.bcp.2020.113899.
36. Ribeiro Franco PI, Rodrigues AP, de Menezes LB, Pacheco Miguel M. Tumor microenvironment components: allies of cancer progression. Pathol Res Pract 2020;216:152729. doi:10.1016/j.prp.2019.152729.
37. Goswami KK, Ghosh T, Ghosh S, Sarkar M, Bose A, Baral R. Tumor promoting role of anti-tumor macrophages in tumor microenvironment. Cell Immunol 2017;316:1–10. doi:10.1016/j.cellimm.2017.04.005.
38. Wu T, Dai Y. Tumor microenvironment and therapeutic response. Cancer Lett 2017;387:61–8. doi:10.1016/j.canlet.2016.01.043.
39. Dussold C, Zilinger K, Turunen J, Heimberger AB, Miska J. Modulation of macrophage metabolism as an emerging immunotherapy strategy for cancer. J Clin Invest 2024;134:e175445. doi:10.1172/JCI175445.
40. Li YR, Fang Y, Lyu Z, Zhu Y, Yang L. Exploring the dynamic interplay between cancer stem cells and the tumor microenvironment: implications for novel therapeutic strategies. J Transl Med 2023;21:686. doi:10.1186/s12967-023-04575-9.
41. Allavena P, Digifico E, Belgiovine C. Macrophages and cancer stem cells: a malevolent alliance. Mol Med 2021;27:121. doi:10.1186/s10020-021-00383-3.
42. Chen Y, Song Y, Du W, Gong L, Chang H, Zou Z. Tumor-associated macrophages: an accomplice in solid tumor progression. J Biomed Sci 2019;26:78. doi:10.1186/s12929-019-0568-z.
43. Zhao G, Liu L, Peek RMJ, et al. Activation of epidermal growth factor receptor in macrophages mediates feedback inhibition of M2 polarization and gastrointestinal tumor cell growth. J Biol Chem 2016;291:20462–72. doi:10.1074/jbc.M116.750182.
44. Zhu S, Yi M, Wu Y, Dong B, Wu K. Roles of tumor-associated macrophages in tumor progression: implications on therapeutic strategies. Exp Hematol Oncol 2021;10:60. doi:10.1186/s40164-021-00252-z. Erratum in: Exp Hematol Oncol 2022 ;11:4. doi: 10.1186/s40164-022-00258-1.
45. de Almeida LGN, Thode H, Eslambolchi Y, et al. Matrix metalloproteinases: from molecular mechanisms to physiology, pathophysiology, and pharmacology. Pharmacol Rev 2022;74:714–70. doi:10.1124/pharmrev.121.000349.
46. Jabłońska-Trypuć A, Matejczyk M, Rosochacki S. Matrix metalloproteinases (MMPs), the main extracellular matrix (ECM) enzymes in collagen degradation, as a target for anticancer drugs. J Enzyme Inhib Med Chem 2016;31(Sup1):177–83. doi:10.3109/14756366.2016.1161620.
47. Gonzalez-Avila G, Sommer B, Mendoza-Posada DA, Garcia-Hernandez AA, Falfan-Valencia R. Matrix metalloproteinases participation in the metastatic process and their diagnostic and therapeutic applications in cancer. Crit Rev Oncol Hematol 2019;137:57–83. doi:10.1016/j.critrevonc.2019.02.010.
48. Quintero-Fabián S, Arreola R, Becerril-Villanueva E, et al. Role of matrix metalloproteinases in angiogenesis and cancer. Front Oncol 2019;9:1370. doi:10.3389/fonc.2019.01370.
49. Niland S, Riscanevo AX, Eble JA. Matrix metalloproteinases shape the tumor microenvironment in cancer progression. Int J Mol Sci 2022;23:146. doi:10.3390/ijms23010146.
50. Lee SG, Woo SM, Seo SU, et al. Cathepsin D promotes polarization of tumor-associated macrophages and metastasis through TGFBI-CCL20 signaling. Exp Mol Med 2024;56:383–94. doi:10.1038/s12276-024-01163-9.
51. Vidergar R, Biswas SK. Metabolic regulation of Cathepsin B in tumor macrophages drives their pro-metastatic function. Cancer Cell 2022;40:1079–81. doi:10.1016/j.ccell.2022.08.023.
52. Dykes SS, Fasanya HO, Siemann DW. Cathepsin L secretion by host and neoplastic cells potentiates invasion. Oncotarget 2019;10:5560–8. doi:10.18632/oncotarget.27182.
53. Pu Y, Ji Q. Tumor-associated macrophages regulate PD-1/PD-L1 immunosuppression. Front Immunol 2022;13:874589. doi:10.3389/fimmu.2022.874589.
54. Gordon SR, Maute RL, Dulken BW, et al. PD-1 expression by tumour-associated macrophages inhibits phagocytosis and tumour immunity. Nature 2017;545:495–9. doi:10.1038/nature22396.
55. Wang L, Guo W, Guo Z, et al. PD-L1-expressing tumor-associated macrophages are immunostimulatory and associate with good clinical outcome in human breast cancer. Cell Reports Med 2024;5.:101420. doi:10.1016/j.xcrm.2024.101420.
56. Zhang H, Liu L, Liu J, et al. Roles of tumor-associated macrophages in anti-PD-1/PD-L1 immunotherapy for solid cancers. Mol Cancer 2023;22:58. doi:10.1186/s12943-023-01725-x.
57. Li W, Wu F, Zhao S, Shi P, Wang S, Cui D. Correlation between PD-1/PD-L1 expression and polarization in tumor-associated macrophages: a key player in tumor immunotherapy. Cytokine Growth Factor Rev 2022;67:49–57. doi:10.1016/j.cytogfr.2022.07.004.
58. Petty AJ, Dai R, Lapalombella R, et al. Hedgehog-induced PD-L1 on tumor-associated macrophages is critical for suppression of tumor-infiltrating CD8+ T cell function. JCI Insight 2021;6: e146707. doi:10.1172/jci.insight.146707.
59. Hartley GP, Chow L, Ammons DT, Wheat WH, Dow SW. Programmed cell death ligand 1 (PD-L1) signaling regulates macrophage proliferation and activation. Cancer Immunol Res 2018;6:1260–73. doi:10.1158/2326-6066.CIR-17-0537.
60. Wang B, Cheng D, Ma D, et al. Mutual regulation of PD-L1 immunosuppression between tumor-associated macrophages and tumor cells: a critical role for exosomes. Cell Commun Signal 2024;22:21. doi:10.1186/s12964-024-01473-5.
61. Shinchi Y, Ishizuka S, Komohara Y, et al. The expression of PD-1 ligand 1 on macrophages and its clinical impacts and mechanisms in lung adenocarcinoma. Cancer Immunol Immunother 2022;71:2645–61. doi:10.1007/s00262-022-03187-4.
62. MacGregor HL, Garcia-Batres C, Sayad A, et al. Tumor cell expression of B7-H4 correlates with higher frequencies of tumor-infiltrating APCs and higher CXCL17 expression in human epithelial ovarian cancer. Oncoimmunology 2019;8:e1665460. doi:10.1080/2162402X.2019.1665460.
63. Zhuo L, Ruan M, Liu Y, et al. B7H4 expression in tumor cells impairs CD8 T cell responses and tumor immunity. Cancer Immunol. Immunother 2020;69:163-74. doi:10.1007/s00262-019-02451-4.
64. Kundu M, Butti R, Panda VK, et al. Modulation of the tumor microenvironment and mechanism of immunotherapy-based drug resistance in breast cancer. Mol Cancer 2024;23:92. doi:10.1186/s12943-024-01990-4
65. Wang S, Wang J, Chen Z, et al. Targeting M2-like tumor-associated macrophages is a potential therapeutic approach to overcome antitumor drug resistance. NPJ Precis Oncol 2024;8:31. doi:10.1038/s41698-024-00522-z.
66. Arlauckas SP, Garren SB, Garris CS, et al. Arg1 expression defines immunosuppressive subsets of tumor-associated macrophages. Theranostics 2018;8:5842–54. doi:10.7150/thno.26888.
67. Pavitra E, Kancharla J, Gupta VK, et al. The role of NF-κB in breast cancer initiation, growth, metastasis, and resistance to chemotherapy. Biomed Pharmacother 2023;163:114822. doi:10.1016/j.biopha.2023.114822.
68. Guo Q, Jin Y, Chen X, et al. NF-κB in biology and targeted therapy: new insights and translational implications. Signal Transduct Target Ther 2024;9:53. doi:10.1038/s41392-024-01757-9.
69. Cornice J, Verzella D, Arboretto P, et al. NF-κB: Governing Macrophages in Cancer. Genes (Basel) 2024;15:197. doi:10.3390/genes15020197.
70. Qin JJ, Yan L, Zhang J, Zhang WD. STAT3 as a potential therapeutic target in triple negative breast cancer: a systematic review. J Exp Clin Cancer Res 2019;38:195. doi:10.1186/s13046-019-1206-z.
71. Jin J, Li Y, Zhao Q, Chen Y, Fu S, Wu JB. Coordinated regulation of immune contexture: crosstalk between STAT3 and immune cells during breast cancer progression. Cell Commun Signal 2021;19:50. doi:10.1186/s12964-021-00705-2.
72. Tošić I, Frank DA. STAT3 as a mediator of oncogenic cellular metabolism: Pathogenic and therapeutic implications. Neoplasia 2021;23:1167–78. doi:10.1016/j.neo.2021.10.003.
73. Fultang N, Chakraborty M, Peethambaran B. Regulation of cancer stem cells in triple negative breast cancer. Cancer Drug Resist 2021;4:321–42. doi:10.20517/cdr.2020.106.
74. Cassetta L, Pollard JW. Targeting macrophages: therapeutic approaches in cancer. Nat Rev Cancer 2018;17:887-904. doi: 10.1038/nrd.2018.169.
75. Li D, Peng X, He G, et al. Crosstalk between autophagy and CSCs: molecular mechanisms and translational implications. Cell Death Dis 2023;14:409. doi:10.1038/s41419-023-05929-3.
76. Munir MT, Kay MK, Kang MH, et al. Tumor-associated macrophages as multifaceted regulators of bteast tumor growth. Int J Mol Sci 2021;22:6526. doi:10.3390/ijms22126526.
77. Aras S, Zaidi MR. TAMeless traitors: macrophages in cancer progression and metastasis. Br J Cancer 2017;117:1583–91. doi:10.1038/bjc.2017.356.
78. Wu G, Wilson G, George J, Liddle C, Hebbard L, Qiao L. Overcoming treatment resistance in cancer: current understanding and tactics. Cancer Lett 2017;387:69–76. doi:10.1016/j.canlet.2016.04.018.
79. Liu Y, Wang H. Biomarkers and targeted therapy for cancer stem cells. Trends Pharmacol Sci 2024;45:56–66. doi:10.1016/j.tips.2023.11.006.
80. Annett S, Robson T. Targeting cancer stem cells in the clinic: current status and perspectives. Pharmacol Ther 2018;187:13–30. doi:10.1016/j.pharmthera.2018.02.001.
81. Zeng Z, Fu M, Hu Y, Wei Y, Wei X, Luo M. Regulation and signaling pathways in cancer stem cells: implications for targeted therapy for cancer. Mol Cancer 2023;22:172. doi:10.1186/s12943-023-01877-w.
82. Lee KL, Kuo YC, Ho YS, Huang YH. Triple-negative bceast Cancer: current uderstanding and future therapeutic breakthrough targeting cancer stemness. Cancers (Basel) 2019;11. doi:10.3390/cancers11091334.
83. Safa AR. Resistance to drugs and cell death in cancer stem cells (CSCs). J Transl Sci 2020;6:341. doi:10.15761/jts.1000341.
84. Raggi C, Mousa HS, Correnti M, Sica A, Invernizzi P. Cancer stem cells and tumor-associated macrophages: a roadmap for multitargeting strategies. Oncogene 2016;35:671–82. doi:10.1038/onc.2015.132.
85. Ismaeel GL, Abdul-Hussein AH, Qasim HM, et al. Therapeutic targeting of dormant cancer stem cells in solid tumors. Gene Reports 2023;30:101717. doi: 10.1016/j.genrep.2022.101717.
86. Kaltschmidt B, Witte KE, Greiner JFW, Weissinger F, Kaltschmidt C. Targeting NF-κB signaling in cancer stem cells: a narrative review. Biomedicines 2022;10:261. doi:10.3390/biomedicines10020261.
87. Zhou Z, Lu ZR. Molecular imaging of the tumor microenvironment. Adv Drug Deliv Rev 2017;113:24–48. doi:10.1016/j.addr.2016.07.012.
88. Borlongan MC, Saha D, Wang H. Tumor microenvironment:a niche for cancer stem cell immunotherapy. Stem Cell Rev Reports 2024;20:3–24. doi:10.1007/s12015-023-10639-6.
89. Qattan A. Novel miRNA targets and therapies in the triple-negative breast cancer microenvironment: an emerging hope for a challenging disease. Int J Mol Sci 2020;21:8905. doi:10.3390/ijms21238905.
90. Ravichandran S, Manickam N, Kandasamy M. Liposome encapsulated clodronate mediated elimination of pathogenic macrophages and microglia: a promising pharmacological regime to defuse cytokine storm in COVID-19. Med Drug Discov 2022;15:100136. doi:10.1016/j.medidd.2022.100136.
91. Allison E, Edirimanne S, Matthews J, Fuller SJ. Breast cancer survival outcomes and tumor-associated macrophage markers: a systematic review and meta-analysis. Oncol Ther 2023;11:27–48. doi:10.1007/s40487-022-00214-3.
92. Biasci D, Smoragiewicz M, Connell CM, et al. CXCR4 inhibition in human pancreatic and colorectal cancers induces an integrated immune response. Proc Natl Acad Sci USA 2020;117:28960-70. doi:10.1073/pnas.20136441117.
93. Tu MM, Abdel-Hafiz HA, Jones RT, et al. Inhibition of the CCL2 receptor, CCR2, enhances tumor response to immune checkpoint therapy. Commun Biol 2020;3:720. doi: 10.1038/s42003-020-01441-y.
94. Maldonado MDM, Schlom J, Hamilton DH. Blockade of tumor-derived colony-stimulating factor 1 (CSF1) promotes an immune-permissive tumor microenvironment. Cancer Immunol Immunother 2023;72:3349–62. doi:10.1007/s00262-023-03496-2.