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ANGPTL4
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesANGPTL4, ANGPTL2, ARP4, FIAF, HARP, HFARP, NL2, PGAR, TGQTL, UNQ171, pp1158, angiopoietin like 4
External IDsOMIM: 604774, 605910 MGI: 1888999 HomoloGene: 10755 GeneCards: ANGPTL4
Orthologs
SpeciesHumanMouse
Entrez

51129

57875

Ensembl

ENSG00000167772

ENSMUSG00000002289

UniProt

Q9BY76

Q9Z1P8

RefSeq (mRNA)

NM_001039667
NM_016109
NM_139314

NM_020581

RefSeq (protein)

NP_001034756
NP_647475

NP_065606

Location (UCSC)Chr 19: 8.36 – 8.37 MbChr 17: 33.99 – 34 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Angiopoietin-like 4 is a protein that in humans is encoded by the ANGPTL4 gene.[5][6][7] Alternatively spliced transcript variants encoded with different isoforms have been described. This gene was previously referred to as ANGPTL2, HFARP, PGAR, or FIAF but has been renamed ANGPTL4.

This gene is induced under hypoxic (low oxygen) condition in various cell types and is the target of peroxisome proliferator-activated receptors. The encoded protein is a serum hormone directly involved in regulating lipid metabolism.

ANGPTL4 plays an important role in numerous cancers and is implicated in the metastatic process by modulating vascular permeability, cancer cell motility and invasiveness.[8][9][10]

Name[edit]

The former name, FIAF, stands for Fasting-Induced Adipose Factor.

Structure[edit]

This gene is a member of the angiopoietin-like gene family and encodes a glycosylated, secreted protein with a coiled-coil N-terminal domain and a fibrinogen-like C-terminal domain.[11]

Expression[edit]

In mice, the highest mRNA expression levels of ANGPTL4 are found in white and brown adipose tissue, followed by liver, kidney, muscle and intestinal tissues. Human ANGPTL4 is most highly expressed in the liver as a hepatokine.

Function[edit]

Picture depicts role of ANGPTL4 as endogenous inhibitor of lipoprotein lipase and its regulation by fatty acids via Peroxisome Proliferator Activated Receptors

This gene is induced under hypoxic (low oxygen) condition in various cell types and is the target of peroxisome proliferator-activated receptors. The encoded protein is a serum hormone directly involved in regulating lipid metabolism. The native full length ANGPTL4 can form higher order structures via intermolecular disulfide bonds. The N-terminal region of ANGPTL4 (nANGPTL4) is responsible for its assembly. The full length ANGPTL4 undergoes proteolytic cleavage at the linker region, releasing nANGPTL4 and the monomeric C-terminal portion of ANGPTL4 (cANGPTL4). The nANGPTL4 and cANGPTL4 have different biological functions.[11] Monoclonal antibodies targeting the nANGPTL4[12] and cANGPTL4[13] have been developed to distinguish their functions.

Clinical significance[edit]

ANGPTL4 plays an important role in numerous cancers and is implicated in the metastatic process by modulating vascular permeability, cancer cell motility and invasiveness.[8][9][10] ANGPTL4 contributes to tumor growth and protects cells from anoikis, a form of programmed cell death induced when contact-dependent cells detach from the surrounding tissue matrix.[13] ANGPTL4 secreted from tumors can bind to integrins, activating downstream signaling and leading to the production of superoxide to promote tumorigenesis.[14] ANGPTL4 disrupts endothelial cell junctions by directly interacting with integrin, VE-cadherin and claudin-5 in a sequential manner to facilitate metastasis.[15] ANGPTL4, specifically the C-terminal fragment (cANGPTL4), is a key player that coordinates an increase in cellular energy flux crucial for epithelial-mesenchymal transition (EMT) via an ANGPTL4:YWHAG (14-3-3γ) signaling axis.[16][17] The ANGPTL4:YWHAG signaling axis confers metabolic flexibility and enhances EMT competency through interaction with specific phosphorylation signals on target proteins. A direct consequence is that ANGPTL4 secures ample cellular energy to fuel multiple ABC transporters to confer EMT-mediated chemoresistance.[18]

ANGPTL4 functions as a matricellular protein[19] to facilitate skin wound healing. ANGPTL4-deficient mice exhibit delayed wound reepithelialization with impaired keratinocyte migration, angiogenesis and altered inflammatory response.[20][21] ANGPTL4 induces nitric oxide production through an integrin/JAK/STAT3-mediated upregulation of iNOS expression in wound epithelia, and enhances angiogenesis to accelerate wound healing in diabetic mice.[22] ANGPTL4 induces a β-catenin-mediated upregulation of ID3 in fibroblasts to reduce scar collagen expression.[23] ANGPTL4 is capable of reversing the fibroblast-to-myofibroblast differentiation induced aligned electrospun fibrous substrates.[24] Cyclic stretching of human tendon fibroblasts stimulated the expression and release of ANGPTL4 protein via TGF-β and HIF-1α signalling, and the released ANGPTL4 was pro-angiogenic.[25] ANGPTL4 is also a potent angiogenic factor whose expression is up-regulated in hypoxic retinal Müller cells in vitro and the ischemic retina in vivo. The expression of ANGPTL4 was increased in the aqueous and vitreous of proliferative diabetic retinopathy patients and localized to areas of retinal neovascularization.[26]

ANGPTL4 has been established as a potent inhibitor of serum triglyceride (TG) clearance, causing elevation of serum TG levels via inhibition of the enzyme lipoprotein lipase (LPL). Biochemical studies indicate that ANGPTL4 disables LPL partly by dissociating the catalytically active LPL dimer into inactive LPL monomers.[27] However, evidence also suggests that ANGPTL4 functions as a conventional, non-competitive inhibitor that binds to LPL to prevent the hydrolysis of substrate as part of reversible mechanism.[28] As a consequence, ANGPTL4 knockout mice have reduced serum triglyceride levels, whereas the opposite is true for mice over-expressing ANGPTL4. ANGPTL4 suppresses foam cell formation to reduce atherosclerosis development.[29] The reduction in LPL activity in adipose tissue during fasting is likely caused by increased local production of ANGPTL4. In other tissues such as heart, production of ANGPTL4 is stimulated by fatty acids and may serve to protect cells against excess fat uptake.[30] ANGPTL4 is more highly induced in nonexercising muscle than in exercising human muscle during acute exercise. ANGPTL4 in nonexercising muscle presumably leads to reduced local uptake of plasma triglyceride-derived fatty acids and their sparing for use by exercising muscle. The induction of ANGPTL4 in exercising muscle likely is counteracted via AMP-activated protein kinase (AMPK)-mediated down-regulation, promoting the use of plasma triglycerides as fuel for active muscles.[31]

High-throughput RNA sequencing of lung tissue samples from the 1918 and 2009 influenza pandemic revealed that ANGPTL4 was one of the most significantly upregulated gene.[32] Murine influenza infection of the lungs stimulated the expression of ANGPTL4 via a STAT3-mediated mechanism. ANGPTL4 enhanced pulmonary tissue leakiness and exacerbated inflammation-induced lung damage. Influenza-infected ANGPTL4-knockout mice displayed diminished lung damage and recovered faster from the infection compared to wild-type mice. The treatment of infected mice with neutralizing anti-ANGPTL4 antibodies significantly accelerated pulmonary recovery and improved lung tissue integrity.[33] It was also shown that antibody treatment against ANGPTL4 reduces pulmonary edema and injury in secondary pneumococcal pneumonia.[34]

References[edit]

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000167772 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000002289 – 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. ^ Kim I, Kim HG, Kim H, Kim HH, Park SK, Uhm CS, et al. (March 2000). "Hepatic expression, synthesis and secretion of a novel fibrinogen/angiopoietin-related protein that prevents endothelial-cell apoptosis". The Biochemical Journal. 346 (Pt 3): 603–10. doi:10.1042/0264-6021:3460603. PMC 1220891. PMID 10698685.
  6. ^ Yoon JC, Chickering TW, Rosen ED, Dussault B, Qin Y, Soukas A, et al. (July 2000). "Peroxisome proliferator-activated receptor gamma target gene encoding a novel angiopoietin-related protein associated with adipose differentiation". Molecular and Cellular Biology. 20 (14): 5343–9. doi:10.1128/MCB.20.14.5343-5349.2000. PMC 85983. PMID 10866690.
  7. ^ Kersten S, Mandard S, Tan NS, Escher P, Metzger D, Chambon P, et al. (September 2000). "Characterization of the fasting-induced adipose factor FIAF, a novel peroxisome proliferator-activated receptor target gene" (PDF). The Journal of Biological Chemistry. 275 (37): 28488–93. doi:10.1074/jbc.M004029200. PMID 10862772.
  8. ^ a b Padua D, Zhang XH, Wang Q, Nadal C, Gerald WL, Gomis RR, et al. (April 2008). "TGFbeta primes breast tumors for lung metastasis seeding through angiopoietin-like 4". Cell. 133 (1): 66–77. doi:10.1016/j.cell.2008.01.046. PMC 2390892. PMID 18394990.
  9. ^ a b Kim SH, Park YY, Kim SW, Lee JS, Wang D, DuBois RN (November 2011). "ANGPTL4 induction by prostaglandin E2 under hypoxic conditions promotes colorectal cancer progression". Cancer Research. 71 (22): 7010–20. doi:10.1158/0008-5472.CAN-11-1262. PMC 3217078. PMID 21937683.
  10. ^ a b Adhikary T, Brandt DT, Kaddatz K, Stockert J, Naruhn S, Meissner W, et al. (October 2013). "Inverse PPARβ/δ agonists suppress oncogenic signaling to the ANGPTL4 gene and inhibit cancer cell invasion". Oncogene. 32 (44): 5241–52. doi:10.1038/onc.2012.549. PMC 3938163. PMID 23208498.
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  13. ^ a b Zhu P, Tan MJ, Huang RL, Tan CK, Chong HC, Pal M, et al. (March 2011). "Angiopoietin-like 4 protein elevates the prosurvival intracellular O2(-):H2O2 ratio and confers anoikis resistance to tumors". Cancer Cell. 19 (3): 401–15. doi:10.1016/j.ccr.2011.01.018. hdl:10220/8177. PMID 21397862.
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  15. ^ Huang RL, Teo Z, Chong HC, Zhu P, Tan MJ, Tan CK, et al. (October 2011). "ANGPTL4 modulates vascular junction integrity by integrin signaling and disruption of intercellular VE-cadherin and claudin-5 clusters". Blood. 118 (14): 3990–4002. doi:10.1182/blood-2011-01-328716. PMID 21841165.
  16. ^ Teo Z, Sng MK, Chan JS, Lim MM, Li Y, Li L, et al. (November 2017). "Elevation of adenylate energy charge by angiopoietin-like 4 enhances epithelial-mesenchymal transition by inducing 14-3-3γ expression". Oncogene. 36 (46): 6408–6419. doi:10.1038/onc.2017.244. PMC 5701092. PMID 28745316.
  17. ^ Tan ZW, Teo Z, Tan C, Choo CC, Loo WS, Song Y, et al. (October 2017). "ANGPTL4 T266M variant is associated with reduced cancer invasiveness". Biochimica et Biophysica Acta (BBA) - Molecular Cell Research. 1864 (10): 1525–1536. doi:10.1016/j.bbamcr.2017.06.010. hdl:10220/44354. PMID 28641978.
  18. ^ Lim MM, Wee JW, Soong JC, Chua D, Tan WR, Lizwan M, et al. (October 2018). "Targeting metabolic flexibility via angiopoietin-like 4 protein sensitizes metastatic cancer cells to chemotherapy drugs". Molecular Cancer. 17 (1): 152. doi:10.1186/s12943-018-0904-z. PMC 6195749. PMID 30342537.
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  20. ^ Goh YY, Pal M, Chong HC, Zhu P, Tan MJ, Punugu L, et al. (December 2010). "Angiopoietin-like 4 interacts with integrins beta1 and beta5 to modulate keratinocyte migration". The American Journal of Pathology. 177 (6): 2791–803. doi:10.2353/ajpath.2010.100129. PMC 2993291. PMID 20952587.
  21. ^ Goh YY, Pal M, Chong HC, Zhu P, Tan MJ, Punugu L, et al. (October 2010). "Angiopoietin-like 4 interacts with matrix proteins to modulate wound healing". The Journal of Biological Chemistry. 285 (43): 32999–3009. doi:10.1074/jbc.M110.108175. PMC 2963335. PMID 20729546.
  22. ^ Chong HC, Chan JS, Goh CQ, Gounko NV, Luo B, Wang X, et al. (September 2014). "Angiopoietin-like 4 stimulates STAT3-mediated iNOS expression and enhances angiogenesis to accelerate wound healing in diabetic mice". Molecular Therapy. 22 (9): 1593–604. doi:10.1038/mt.2014.102. PMC 4435481. PMID 24903577.
  23. ^ Teo Z, Chan JS, Chong HC, Sng MK, Choo CC, Phua GZ, et al. (July 2017). "Angiopoietin-like 4 induces a β-catenin-mediated upregulation of ID3 in fibroblasts to reduce scar collagen expression". Scientific Reports. 7 (1): 6303. Bibcode:2017NatSR...7.6303T. doi:10.1038/s41598-017-05869-x. PMC 5524754. PMID 28740178.
  24. ^ Chen H, Lui YS, Tan ZW, Lee JY, Tan NS, Tan LP (May 2019). "Migration and Phenotype Control of Human Dermal Fibroblasts by Electrospun Fibrous Substrates". Advanced Healthcare Materials. 8 (9): e1801378. doi:10.1002/adhm.201801378. PMID 30901162. S2CID 85448471.
  25. ^ Mousavizadeh R, Scott A, Lu A, Ardekani GS, Behzad H, Lundgreen K, et al. (June 2016). "Angiopoietin-like 4 promotes angiogenesis in the tendon and is increased in cyclically loaded tendon fibroblasts". The Journal of Physiology. 594 (11): 2971–83. doi:10.1113/JP271752. PMC 4887665. PMID 26670924.
  26. ^ Babapoor-Farrokhran S, Jee K, Puchner B, Hassan SJ, Xin X, Rodrigues M, et al. (June 2015). "Angiopoietin-like 4 is a potent angiogenic factor and a novel therapeutic target for patients with proliferative diabetic retinopathy". Proceedings of the National Academy of Sciences of the United States of America. 112 (23): E3030-9. Bibcode:2015PNAS..112E3030B. doi:10.1073/pnas.1423765112. PMC 4466723. PMID 26039997.
  27. ^ Sukonina V, Lookene A, Olivecrona T, Olivecrona G (November 2006). "Angiopoietin-like protein 4 converts lipoprotein lipase to inactive monomers and modulates lipase activity in adipose tissue". Proceedings of the National Academy of Sciences of the United States of America. 103 (46): 17450–5. Bibcode:2006PNAS..10317450S. doi:10.1073/pnas.0604026103. PMC 1859949. PMID 17088546.
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  34. ^ Li L, Foo BJ, Kwok KW, Sakamoto N, Mukae H, Izumikawa K, et al. (June 2019). "Antibody Treatment against Angiopoietin-Like 4 Reduces Pulmonary Edema and Injury in Secondary Pneumococcal Pneumonia". mBio. 10 (3). doi:10.1128/mBio.02469-18. PMC 6550533. PMID 31164474.

External links[edit]

Further reading[edit]

source: https://en.wikipedia.org/wiki/ANGPTL4

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