Fascin

Short description: Actin bundling protein

fascin homolog 1

Identifiers
Symbol| FSCN1
Alt. symbols| SNL
NCBI gene| 6624
HGNC| 11148
OMIM| 602689
RefSeq| NM_003088
UniProt| Q16658
Other data
Locus| Chr. 7 p22
fascin homolog, retinal

Identifiers
Symbol| FSCN2
NCBI gene| 25794
HGNC| 3960
OMIM| 607643
RefSeq| NM_012418
UniProt| O14926
Other data
Locus| Chr. 17 q25
fascin homolog 3, testicular

Identifiers
Symbol| FSCN3
NCBI gene| 29999
HGNC| 3961
RefSeq| NM_020369
UniProt| Q9NQT6
Other data
Locus| Chr. 7 q31.3

Fascin is an actin bundling protein.

## Contents

* 1 Species and tissue distribution
* 2 Function
* 3 Clinical significance
* 4 Structure
* 5 References
* 6 External links

## Species and tissue distribution

It is a 54–58 kilodalton monomeric actin filament bundling protein originally isolated from sea urchin egg but also found in Drosophila[1] and vertebrates,[2] including humans.[3] Fascin (from the Latin for bundle) is spaced at 11 nanometre intervals along the filament. The bundles in cross section are seen to be hexagonally packed, and the longitudinal spacing is compatible with a model where fascin cross-links at alternating 4 and 5 actins.[4] It is calcium insensitive and monomeric. Three forms of fascin are found in vertebrates: Fascin1, widely found in the nervous system and elsewhere; fascin2 found in the retinal photoreceptor cells; fascin3, which is only found in the testes.[5][6]

## Function

Fascin binds beta-catenin,[7] and colocalizes with it at the leading edges and borders of epithelial and endothelial cells. The role of Fascin in regulating cytoskeletal structures for the maintenance of cell adhesion, coordinating motility and invasion through interactions with signalling pathways is an active area of research especially from the cancer biology perspective.[5][6] Fascin localizes to actin-rich protrusions at the cell surface called filopodia. Recent study shows that fascin also localizes to invadopodia, membrane protrusions formed at the adherent cell surface that facilitate extracellular matrix (ECM) invasion, this provide a potential molecular mechanism for how fascin increases the invasiveness of cancer cells since fascin expression is upregulated in a spectrum of cancers.[8] Studies have also shown that Fascin plays a major role in immune suppression. T regulatory cell adhesion to antigen presenting dendritic cell causes sequestration of Fascin-1, an actin-bundling protein essential for immunological synapse formation, and skews Fascin-1–dependent actin polarization in antigen presenting dendritic cells toward the T reg cell adhesion zone. Although it is reversible upon T regulatory cell disengagement, this sequestration of essential cytoskeletal components causes a lethargic state of dendritic cells, leading to reduced T cell priming. This suggests Treg-mediated suppression of antigen presenting cells is a multi-step process. In addition to CTLA-4 CD80/CD86 interaction fascin dependent polarization of cytoskeleton towards dendritic cell Treg immune synapse play a pivotal role.[9] In normal tissue, inflammation and the immune response would be limited by secretion of TGF-β. TGF-β on the one hand induces fascin expression, but on the other hand, restricts activity of transcription factor NF-κB. This results to limited fascin expression and allows tissue to rebuild epithelial barriers. In cancer, instead, TGF-β does not restrict NF-κB activity, and both can increase fascin expression, disrupting tissue structure and function. [10]

## Clinical significance

Abnormal fascin expression or function has been implicated in breast cancer,[11] colon cancer,[12][13] esophageal squamous cell carcinoma,[14] gallbladder cancer,[15] pancreatic cancer,[16] and prostate cancer.[17] It is also helpful in identifying Hodgkin cells.

## Structure

Fascin is a structural protein found in mesenchyme, nervous, and retinal tissue and is used in the bundling of actin molecules.[18]

The structure of human fascin has been determined to a resolution of 1.8 Å (PDBID 3LLP) and reveals an arrangement of four tandem beta-trefoil domains that form a two lobed structure with pseudo 2-fold symmetry. It is stabilized by a hydrophobic core and a hydrophilic surface since it is often found inside cell cytoplasm in the formation of filopodia.[19]

## References

1. ↑ "Fascin, an echinoid actin-bundling protein, is a homolog of the Drosophila singed gene product". Proceedings of the National Academy of Sciences of the United States of America 90 (19): 9115–9119. October 1993. doi:10.1073/pnas.90.19.9115. ISSN 0027-8424. PMID 8415664. Bibcode: 1993PNAS...90.9115B.
2. ↑ "Fascins, a family of actin bundling proteins". Cell Motility and the Cytoskeleton (John Wiley & Sons) 32 (1): 1–9. 1995. doi:10.1002/cm.970320102. ISSN 0886-1544. PMID 8674129.
3. ↑ "Purification and characterization of an F-actin-bundling 55-kilodalton protein from HeLa cells". Journal of Biological Chemistry 260 (8): 5087–5097. April 1985. doi:10.1016/S0021-9258(18)89183-9. ISSN 0021-9258. PMID 3886649.
4. ↑ "Separation and interaction of the major components of sea urchin actin gel". Journal of Molecular Biology 125 (2): 207–224. October 1978. doi:10.1016/0022-2836(78)90345-5. ISSN 0022-2836. PMID 731692.
5. ↑ 5.0 5.1 "Roles of fascin in cell adhesion and motility". Current Opinion in Cell Biology 16 (5): 590–596. October 2004. doi:10.1016/j.ceb.2004.07.009. ISSN 0955-0674. PMID 15363811.
6. ↑ 6.0 6.1 "Roles of fascin in human carcinoma motility and signaling: Prospects for a novel biomarker?". The International Journal of Biochemistry & Cell Biology (Elsevier) 37 (9): 1787–1804. September 2005. doi:10.1016/j.biocel.2005.05.004. ISSN 1357-2725. PMID 16002322.
7. ↑ "beta-Catenin associates with the actin-bundling protein fascin in a noncadherin complex". Journal of Cell Biology (Rockefeller University Press) 134 (5): 1271–1281. September 1996. doi:10.1083/jcb.134.5.1271. ISSN 0021-9525. PMID 8794867.
8. ↑ "The actin-bundling protein fascin stabilizes actin in invadopodia and potentiates protrusive invasion". Curr. Biol. 20 (4): 339–45. Feb 2010. doi:10.1016/j.cub.2009.12.035. PMID 20137952.
9. ↑ Chen, Jiahuan; Ganguly, Anutosh; Mucsi, Ashley D.; Meng, Junchen; Yan, Jiacong; Detampel, Pascal; Munro, Fay; Zhang, Zongde et al. (2017-01-12). "Strong adhesion by regulatory T cells induces dendritic cell cytoskeletal polarization and contact-dependent lethargy". Journal of Experimental Medicine 214 (2): –20160620. doi:10.1084/jem.20160620. ISSN 0022-1007. PMID 28082358.
10. ↑ Vlahopoulos, SA; Cen, O; Hengen, N; Agan, J; Moschovi, M; Critselis, E; Adamaki, M; Bacopoulou, F et al. (20 June 2015). "Dynamic aberrant NF-κB spurs tumorigenesis: A new model encompassing the microenvironment.". Cytokine & Growth Factor Reviews 26 (4): 389–403. doi:10.1016/j.cytogfr.2015.06.001. PMID 26119834.
11. ↑ "Fascin, an actin-bundling protein associated with cell motility, is upregulated in hormone receptor negative breast cancer". British Journal of Cancer 83 (7): 870–873. 2000. doi:10.1054/bjoc.2000.1395. ISSN 0007-0920. PMID 10970687.
12. ↑ "Fascin, an actin-bundling protein, modulates colonic epithelial cell invasiveness and differentiation in vitro". American Journal of Pathology (American Society for Investigative Pathology) 162 (1): 69–80. January 2003. doi:10.1016/S0002-9440(10)63799-6. ISSN 0002-9440. PMID 12507891.
13. ↑ "Fascin, a Novel Target of β-Catenin-TCF Signaling, Is Expressed at the Invasive Front of Human Colon Cancer". Cancer Research 67 (14): 6844–6853. July 2007. doi:10.1158/0008-5472.CAN-07-0929. ISSN 0008-5472. PMID 17638895.
14. ↑ "Prognostic Significance of Fascin Overexpression in Human Esophageal Squamous Cell Carcinoma". Clinical Cancer Research (American Association for Cancer Research) 11 (7): 2597–2605. April 2005. doi:10.1158/1078-0432.CCR-04-1378. ISSN 1078-0432. PMID 15814639.
15. ↑ "Fascin overexpression correlates with positive thrombospondin-1 and syndecan-1 expressions and a more aggressive clinical course in patients with gallbladder cancer". Journal of Hepato-Biliary-Pancreatic Surgery (Springer International) 16 (3): 315–21. March 2009. doi:10.1007/s00534-009-0046-1. ISSN 0944-1166. PMID 19259612.
16. ↑ "Fascin Is Regulated by Slug, Promotes Progression of Pancreatic Cancer in Mice, and Is Associated With Patient Outcomes". Gastroenterology 146 (5): 1386–1396.e17. 2014. doi:10.1053/j.gastro.2014.01.046. ISSN 0016-5085. PMID 24462734.
17. ↑ "Fascin regulates prostate cancer cell invasion and is associated with metastasis and biochemical failure in prostate cancer". Clinical Cancer Research (American Association for Cancer Research) 15 (4): 1376–1383. February 2009. doi:10.1158/1078-0432.CCR-08-1789. ISSN 1078-0432. PMID 19228738.
18. ↑ "Fascin: a key regulator of cytoskeletal dynamics". Int. J. Biochem. Cell Biol. 42 (10): 1614–7. October 2010. doi:10.1016/j.biocel.2010.06.019. PMID 20601080.
19. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `pmid20434460`

## External links

* fascin at the US National Library of Medicine Medical Subject Headings (MeSH)

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