MARCO

Last updated
MARCO
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases MARCO , SCARA2, macrophage receptor with collagenous structure, SR-A6
External IDs OMIM: 604870 MGI: 1309998 HomoloGene: 4928 GeneCards: MARCO
Orthologs
SpeciesHumanMouse
Entrez

8685

17167

Ensembl

ENSG00000019169

ENSMUSG00000026390

UniProt

Q9UEW3

Q60754

RefSeq (mRNA)

NM_006770

NM_010766

RefSeq (protein)

NP_006761

NP_034896

Location (UCSC) Chr 2: 118.94 – 118.99 Mb Chr 1: 120.4 – 120.43 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Macrophage receptor with collagenous structure (MARCO) is a protein that in humans is encoded by the MARCO gene. [5] [6] [7] [8] MARCO is a class A scavenger receptor that is found on particular subsets of macrophages. [9] [10] [11] Scavenger receptors are pattern recognition receptors (PRRs) found most commonly on immune cells. [10] Their defining feature is that they bind to polyanions and modified forms of a type of cholesterol called low-density lipoprotein (LDL). [9] [10] MARCO is able to bind and phagocytose these ligands and pathogen-associated molecular patterns (PAMPs), leading to the clearance of pathogens and cell signaling events that lead to inflammation. [11] [12] As part of the innate immune system, MARCO clears, or scavenges, pathogens, which leads to inflammatory responses. [12] The scavenger receptor cysteine-rich (SRCR) domain at the end of the extracellular side of MARCO binds ligands to activate the subsequent immune responses. [12] MARCO expression on macrophages has been associated with tumor development and also with Alzheimer's disease, via decreased responses of cells when ligands bind to MARCO. [13] [14]

Contents

Structure

The structure of MARCO in a cell membrane. MARCO is a receptor that sits on the surface of cells in the immune system. There are five domains. MARCO Domain Structure.jpg
The structure of MARCO in a cell membrane. MARCO is a receptor that sits on the surface of cells in the immune system. There are five domains.

MARCO is a transmembrane protein that has 5 domains (see figure). [10] The domain within the cell is called the cytoplasmic domain, as well as a transmembrane domain. [10] The extracellular regions of MARCO include a spacer domain, a collagenous domain, and the SRCR domain. The SRCR domain is required for MARCO binding to ligands, via 2 highly conserved arginine residues, termed the RxR motif. [10] [12]

Other members of the class A scavenger receptors tend to have alpha helical coiled coil domains, but MARCO does not. [9] The C-terminal SRCR domain of MARCO affects the ability of the receptor to bind and take up ligand, activate inflammatory signaling, and adhere to surfaces. [12]

Cell expression

MARCO is expressed on a subset of tissue-resident macrophages in normal tissues, as well as circulating monocytes, dendritic cells, and B cells. [10] [15] MARCO is typically present on the macrophages in the marginal zone of the spleen and the medullary lymph nodes, but it is also found in the liver. [13] Dendritic cells increase expression of MARCO when exposed to certain pathogens, resulting in alterations to the cytoskeleton of dendritic cells and increased phagocytosis. [9] [16] [10]

MARCO is highly expressed by macrophages and monocytes in the tumor microenvironment (TME), including tumor-associated macrophages (TAMs) and monocytic myeloid-derived suppressor cells (mMDSCs). [17] [18] Expression of MARCO correlated (FDR < 0.01 and R > 0.2126212) with expression of genes associated with immunosuppressive TAMs, such as CD68, CD163, MSR1, IL4R, CHIA, TGFB1, IL10, and IL37 , whereas no correlation was observed with expression of inducible nitric oxide synthase (NOS2), which is expressed by macrophages with an anti-tumor phenotype.

Functions

Phagocytosis

The primary function of scavenger receptors is to regulate phagocytosis of pathogens, but they also participate in cell–cell recognition and initiation of inflammatory responses. [11] [10] MARCO, being a PRR, is able to bind to a wide variety of bacteria, making it an important receptor for activating an immune response against bacteria. [12] Soluble LPS and entire bacteria can each bind bind to MARCO, [19] as well as acetylated LDL (AcLDL), oxidized LDL (OxLDL), B cells in the marginal zone of the spleen, and apoptotic cells. [9] [10] MARCO is therefore able to recognize and phagocytose pathogens and apoptotic cells, and operates independently of opsonization. [12]

Regulation of Inflammation

MARCO does not directly cause an inflammatory response, but it can interact with PAMPs to promote inflammation. [11] [12] One way MARCO does this is by tethering a pathogen to other receptors on the cell, including PRRs such as TLR2, [12] which then lead to the activation of the transcription factor NF-κB, which regulates expression of genes that encode cytokines. [12] Through phagocytosis, MARCO also brings pathogens into the cell, which are processed by intracellular compartments that contain other signaling receptors such as TLR3, NOD2, and NALP3. [11] However, lung cancer cells polarize macrophages to express MARCO and acquire an immune-suppressive phenotype, through the release of IL37. [18] MARCO-expressing TAMs blocked activation of cytotoxic T cells and NK cells, inhibiting their proliferation, cytokine production, and tumor-cell killing capacity. Furthermore, MARCO+ macrophages increased proliferation of T-regulatory (Treg) cells and production of IL10, and diminished activity of CD8+ T cells. [18] Blocking MARCO or knocking out IL37 in lung cancer cell lines repolarized TAMs, resulting in recovered cytolytic activity and anti-tumor effects of natural killer (NK) cells and T cells, as well as reduced Treg-cell activities. [18]

Association with diseases

Alzheimer's disease

The activity of MARCO on microglia, the macrophages of the brain, is believed to be altered in development of Alzheimer's disease. [11] [14] One primary characteristic of Alzheimer's disease is the presence of numerous senile plaques in the brain that contain amyloid beta peptides (Aβ). [14] Initially, the microglia clear the Aβ, which binds to receptors such as MARCO. [14] During development of Alzheimer's disease, however, the ability of microglia to clear Aβ is decreased, resulting in Aβ accumulation, [14] which is neurotoxic. [14] MARCO also interacts with formyl peptide receptor 2 (FPR2) to form a complex that causes the microglia to release inflammatory cytokines, which can also cause damage to neurons. [14]

Cancer

Antibodies against MARCO have been shown to slow growth and metastasis in syngeneic mouse tumor models, by reprogramming immunosuppressive (M2)-like TAMs into inflammatory (M1)-like macrophages. This switch involves changes to the metabolic program of the macrophages and activation of NK cells. [17] [20] In addition, targeting MARCO on human macrophages repolarizes TAMs and restores the cytotoxic, anti-tumor capacities of NK and T cells. [18] [20] These findings indicate that strategies that target MARCO-expressing TAMs to remodel the immune-suppressive tumor microenvironment might be developed for cancer therapy.

In non-small-cell lung cancer (NSCLC) tissues, researchers found an association between expression of MARCO mRNA and genes that regulate immune response pathways, including immunosuppressive TAMs, T-cell infiltration, and immune checkpoint molecules. Higher infiltration of tumor tissues by macrophages was seen in tumors expressing PD-L1; macrophages within tumor cell nests co-expressed MARCO and PD-L1. MARCO is therefore a target of immune therapeutic strategies to inhibit TAMs in NSCLC, possibly in combination with immune checkpoint inhibitors. [21]

In patients with renal cell carcinoma or colorectal cancer, those with tumors that expressed low levels of MARCO had longer survival times than patients whose tumors expressed high levels of MARCO. Additionally, high MARCO levels are observed in patients with melanoma that is refractory to checkpoint inhibitor therapy, and patients with solid tumors refractory to chemotherapy. [22]

Related Research Articles

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<span class="mw-page-title-main">MSR1</span> Protein-coding gene in the species Homo sapiens

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References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000019169 - Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000026390 - Ensembl, May 2017
  3. ↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ↑ Elomaa O, Sankala M, Pikkarainen T, Bergmann U, Tuuttila A, Raatikainen-Ahokas A, et al. (February 1998). "Structure of the human macrophage MARCO receptor and characterization of its bacteria-binding region". The Journal of Biological Chemistry. 273 (8): 4530–4538. doi: 10.1074/jbc.273.8.4530 . PMID   9468508.
  6. ↑ Elomaa O, Kangas M, Sahlberg C, Tuukkanen J, Sormunen R, Liakka A, et al. (February 1995). "Cloning of a novel bacteria-binding receptor structurally related to scavenger receptors and expressed in a subset of macrophages". Cell. 80 (4): 603–609. doi: 10.1016/0092-8674(95)90514-6 . PMID   7867067. S2CID   18632239.
  7. ↑ Kangas M, Brännström A, Elomaa O, Matsuda Y, Eddy R, Shows TB, Tryggvason K (May 1999). "Structure and chromosomal localization of the human and murine genes for the macrophage MARCO receptor". Genomics. 58 (1): 82–89. doi:10.1006/geno.1999.5811. PMID   10331948.
  8. ↑ "Entrez Gene: MARCO macrophage receptor with collagenous structure".
  9. 1 2 3 4 5 Plüddemann A, Neyen C, Gordon S (November 2007). "Macrophage scavenger receptors and host-derived ligands". Methods. 43 (3): 207–217. doi:10.1016/j.ymeth.2007.06.004. PMID   17920517.
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  11. 1 2 3 4 5 6 Mukhopadhyay S, Varin A, Chen Y, Liu B, Tryggvason K, Gordon S (January 2011). "SR-A/MARCO-mediated ligand delivery enhances intracellular TLR and NLR function, but ligand scavenging from cell surface limits TLR4 response to pathogens". Blood. 117 (4): 1319–1328. doi: 10.1182/blood-2010-03-276733 . PMID   21098741.
  12. 1 2 3 4 5 6 7 8 9 10 Novakowski KE, Huynh A, Han S, Dorrington MG, Yin C, Tu Z, et al. (August 2016). "A naturally occurring transcript variant of MARCO reveals the SRCR domain is critical for function". Immunology and Cell Biology. 94 (7): 646–655. doi:10.1038/icb.2016.20. PMC   4980223 . PMID   26888252.
  13. 1 2 Sun H, Song J, Weng C, Xu J, Huang M, Huang Q, et al. (May 2017). "Association of decreased expression of the macrophage scavenger receptor MARCO with tumor progression and poor prognosis in human hepatocellular carcinoma". Journal of Gastroenterology and Hepatology. 32 (5): 1107–1114. doi:10.1111/jgh.13633. PMID   27806438. S2CID   9564859.
  14. 1 2 3 4 5 6 7 Yu Y, Ye RD (January 2015). "Microglial Aβ receptors in Alzheimer's disease". Cellular and Molecular Neurobiology. 35 (1): 71–83. doi:10.1007/s10571-014-0101-6. PMID   25149075. S2CID   15704092.
  15. ↑ Getts DR, Terry RL, Getts MT, Deffrasnes C, Müller M, van Vreden C, et al. (January 2014). "Therapeutic inflammatory monocyte modulation using immune-modifying microparticles". Science Translational Medicine. 6 (219): 219ra7. doi:10.1126/scitranslmed.3007563. PMC   3973033 . PMID   24431111.
  16. ↑ Kissick HT, Dunn LK, Ghosh S, Nechama M, Kobzik L, Arredouani MS (2014-08-04). "The scavenger receptor MARCO modulates TLR-induced responses in dendritic cells". PLOS ONE. 9 (8): e104148. Bibcode:2014PLoSO...9j4148K. doi: 10.1371/journal.pone.0104148 . PMC   4121322 . PMID   25089703.
  17. 1 2 Georgoudaki AM, Prokopec KE, Boura VF, Hellqvist E, Sohn S, Östling J, et al. (May 2016). "Reprogramming Tumor-Associated Macrophages by Antibody Targeting Inhibits Cancer Progression and Metastasis". Cell Reports. 15 (9): 2000–2011. doi: 10.1016/j.celrep.2016.04.084 . PMID   27210762.
  18. 1 2 3 4 5 La Fleur L, Botling J, He F, Pelicano C, Zhou C, He C, et al. (February 2021). "Targeting MARCO and IL37R on Immunosuppressive Macrophages in Lung Cancer Blocks Regulatory T Cells and Supports Cytotoxic Lymphocyte Function". Cancer Research. 81 (4): 956–967. doi: 10.1158/0008-5472.CAN-20-1885 . PMID   33293426. S2CID   228079815.
  19. ↑ Athanasou NA (May 2016). "The pathobiology and pathology of aseptic implant failure". Bone & Joint Research. 5 (5): 162–168. doi:10.1302/2046-3758.55.bjr-2016-0086. PMC   4921050 . PMID   27146314.
  20. 1 2 Eisinger S, Sarhan D, Boura VF, Ibarlucea-Benitez I, Tyystjärvi S, Oliynyk G, et al. (December 2020). "Targeting a scavenger receptor on tumor-associated macrophages activates tumor cell killing by natural killer cells". Proceedings of the National Academy of Sciences of the United States of America. 117 (50): 32005–32016. Bibcode:2020PNAS..11732005E. doi: 10.1073/pnas.2015343117 . PMC   7750482 . PMID   33229588.
  21. ↑ La Fleur L, Boura VF, Alexeyenko A, Berglund A, Pontén V, Mattsson JS, et al. (October 2018). "Expression of scavenger receptor MARCO defines a targetable tumor-associated macrophage subset in non-small cell lung cancer". International Journal of Cancer. 143 (7): 1741–1752. doi: 10.1002/ijc.31545 . PMID   29667169. S2CID   4941508.
  22. ↑ Jahchan NS, Mujal AM, Pollack JL, Binnewies M, Sriram V, Reyno L, Krummel MF (2019). "Tuning the Tumor Myeloid Microenvironment to Fight Cancer". Frontiers in Immunology. 10: 1611. doi: 10.3389/fimmu.2019.01611 . PMC   6673698 . PMID   31402908.

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