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CYR61

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CCN1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesCCN1, GIG1, IGFBP10, cysteine rich angiogenic inducer 61, cellular communication network factor 1, CYR61
External IDsOMIM: 602369; MGI: 88613; HomoloGene: 1194; GeneCards: CCN1; OMA:CCN1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

3491

16007

Ensembl

ENSG00000142871

ENSMUSG00000028195

UniProt

O00622

P18406

RefSeq (mRNA)

NM_001554

NM_010516

RefSeq (protein)

NP_001545

NP_034646

Location (UCSC)Chr 1: 85.58 – 85.58 MbChr 3: 145.35 – 145.36 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Cysteine-rich angiogenic inducer 61 (CYR61) or CCN family member 1 (CCN1), is a matricellular protein that in humans is encoded by the CYR61 gene.[5]

CYR61 is a secreted, extracellular matrix (ECM)-associated signaling protein of the CCN family (CCN intercellular signaling protein).[6][7] CYR61 is capable of regulating a broad range of cellular activities, including cell adhesion, migration, proliferation, differentiation, apoptosis, and senescence through interaction with cell surface integrin receptors and heparan sulfate proteoglycans. During embryonic development, CYR61 is critical for cardiac septal morphogenesis, blood vessel formation in placenta, and vascular integrity. In adulthood CYR61 plays important roles in inflammation and tissue repair, and is associated with diseases related to chronic inflammation, including rheumatoid arthritis, atherosclerosis, diabetes-related nephropathy and retinopathy, and many different forms of cancers.

CCN protein family

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CYR61 was first identified as a protein encoded by a serum-inducible gene in mouse fibroblasts.[6][8] Other highly conserved homologs were later identified to comprise the CCN protein family (CCN intercellular signaling protein).[9][10][11] The CCN acronym is derived from the first three members of the family identified, namely CYR61 (CCN1), CTGF (connective tissue growth factor, or CCN2), and NOV (nephroblastoma overexpressed, or CCN3). These proteins, together with WISP1 (CCN4), WISP2 (CCN5), and WISP3 (CCN6) comprise the six members of the family in vertebrates and have been renamed CCN1-6 in order of their discovery by international consensus.[12] CCN proteins function as matricellular proteins, which are extracellular matrix proteins that play regulatory roles, particularly in the context of wound repair.[13]

Gene structure and regulation

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CYR61 is located at human chromosome 1p22.3, whereas the mouse Cyr61 gene is located at chromosome 3, 72.9cM.[14] The mouse CYR61 coding region spans ~3.2 Kb, containing 5 exons interspaced with 4 introns.[15] The first exon encodes 5’-UTR sequence and the first several amino acids in the secretory signal peptide. The remaining four exons each encode a distinct CCN1 domain. The 5th exon also contains the 3’-UTR sequences, which has 5 copies of AU-rich elements that confers a short mRNA half life, and a mir-155 target site.[16] The CYR61 promoter is a TATA box containing promoter, with binding sites for many transcription factors including AP1, ATF, E2F, HNF3b, NF1, NFκB, SP1, and SRF, and 2 poly(CA) stretches that may form Z-DNA structure. Transcriptional activation of CYR61 is exquisitely sensitive to a wide range of environmental perturbations, including stimulation by platelet-derived growth factor and basic fibroblast growth factor, transforming growth factor β1 (TGF-β1), growth hormone, the phorbol ester 12-O-tetradecanoylphorbol-13-acetate (TPA), cAMP, vitamin D3, estrogen and tamoxifen, angiotensin II, hypoxia, UV light, and mechanical stretch.[7][11]

Protein structure and function

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Structural domains

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Full-length CYR61 protein contains 381 amino acids with an N-terminal secretory signal peptide followed by four structurally distinct domains.[17] The four CYR61 domains are, from N- to C-termini, the insulin-like growth factor binding protein (IGFBP) domain, von Willebrand type C repeats (vWC) domain, thrombospondin type 1 repeat domain (TSR), and the C-terminal (CT) domain that contains a cysteine-knot motif. CCN1 has unusually high cysteine residue content (10% or 38 in total). The number and spacing of cysteine residues are completely conserved among CYR61 (CCN1), CTGF (CCN2), NOV (CCN3), and WISP-1 (CCN4), and are largely conserved with WISP-2 (CCN5), which lacks precisely the CT domain, and WISP3 (CCN6), which lacks 4 cysteines in the vWC domain. CYR61 is glycosylated, although the regulation and function of glycosylation are unknown.

CCN1 Protein Structure

Integrin binding

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CYR61 binds directly to various integrin receptors in a cell type-dependent manner, including integrin αvβ3 in endothelial cells,[18] α6β1 and heparan sulfate proteoglycans (HSPGs) in fibroblasts and smooth muscle cells[19][20] αIIbβ3 in activated platelets,[21] αMβ2 in monocytes and macrophages,[22][23] and αDβ2 in macrophage foam cells.[24] Where examined, syndecan-4 has been identified as the HSPG critical for CCN1 functions.[25][26] The CYR61 binding sites for some of these integrins have been mapped (Figure 1). Due to the cell type specificity of integrin expression, CYR61 acts through distinct integrins to mediate specific functions in different types of cells. For example, CYR61 induces angiogenic functions in endothelial cells through αvβ3,[27] and in fibroblasts promotes cellular senescence and enables TNFα to induce apoptosis through binding to α6β1-HSPGs.[26][28] However, CYR61 supports cell adhesion through all of the integrins identified above.

Cell signaling and function

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As a cell adhesive substrate, CYR61 induces the activation of focal adhesion kinase, paxillin, RAC, and sustained activation of MAPK/ERK1-2.[29] In macrophages, CYR61 also activates the transcription factor NFκB and stimulates M1 polarization.[23] CYR61 activates Akt signaling in thymic epithelial cells, promoting their proliferation and thus thymic size growth.[30] CYR61 has potent angiogenic activity upon endothelial cells and induces neovascularization, first demonstrated in a corneal micropocket implant assay[31] and subsequently confirmed in a rabbit ischemic hindlimb model.[32] CYR61 also accelerates and promotes the chondrogenic differentiation of mouse limb bud mesenchymal cells,[33] and stimulates osteoblast differentiation but inhibits osteoclastogenesis.[34][35][36] Cyr61 is a strong inducer of reactive oxygen species accumulation in fibroblastic cells, and this activity underlies many CYR61-induced apoptosis and senescence.[26][28] CYR61 is able to support cell adhesion, stimulate cell migration, promote growth factor-induced cell proliferation and differentiation in some cell types, promote apoptosis in synergy with TNF family cytokines, and induce cellular senescence in fibroblasts.

Embryonic development

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During embryo development in mice, Cyr61 is highly expressed in the cardiovascular, skeletal, and neuronal systems.[37][38] Cyr61 knockout mice are embryonic lethal due to defects in cardiac septal morphogenesis, deficient blood vessel formation in placenta, and compromised vascular integrity.[39][40] In Xenopus laevis, Cyr61 is required for normal gastrulation and modulation of Wnt signaling.[41]

Clinical relevance

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CYR61 is highly expressed at sites of inflammation and wound repair, and is associated with diseases involving chronic inflammation and tissue injury.[7]

Wound healing and fibrosis

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In skin wound healing, CYR61 is highly expressed in the granulation tissue by myofibroblasts, which proliferate and rapidly synthesize ECM to maintain tissue integrity and to promote regeneration of parenchymal cells.[42][43] However, excessive matrix deposition can lead to fibrosis, scarring, and loss of tissue function. In skin wounds, CYR61 accumulates in the granulation tissue as myofibroblasts proliferate, and eventually reaches a sufficiently high level to drive the myofibroblasts themselves into senescence, whereupon these cells cease to proliferate and express matrix-degrading enzymes.[28] Thus, CYR61 limits synthesis and deposition of ECM by myofibroblasts, reducing the risk of fibrosis during wound healing.[44] In addition to skin wound healing, CYR61 expression is elevated in remodeling cardiomyocytes after myocardial infarction,[45] in vascular injury,[20] and in the long bones during fracture repair.[46][47] Blockade of CYR61 by antibodies inhibits bone fracture healing in mice.[48] In the kidney, CYR61 is expressed in podocytes in normal adult and embryonic glomeruli, but expression is decreased in IgA nephropathy, diabetic nephropathy, and membranous nephropathy, particularly in diseased kidneys with severe mesangial expansion.[49] CYR61 induction of cellular senescence in the kidney is a potential therapy to limit fibrosis.[50]

Inflammation

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CYR61 promotes the apoptotic functions of inflammatory cytokines such as TNFα, FasL, and TRAIL.[26][51][52] It also reprograms macrophages towards M1 polarization through αMβ2-mediated activation of NF-κB.[23] CYR61 is upregulated in patients with Crohn's disease and ulcerative colitis.[53] CYR61 supports the patrolling behavior of murine resident Ly6Clow monocytes along the endothelial in the steady state and is required for their accumulation under viral-mimicking vascular inflammation.[54]

Arthritis

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CYR61 is highly expressed in collagen-induced arthritis in rodents, and inhibition of CCN1 expression correlates with suppression of inflammatory arthritis.[55] CYR61 is also found in articular cartilage from patients with osteoarthritis and appears to suppress ADAMTS4 (aggrecanase) activity, possibly leading to cartilage cell (chondrocyte) cloning.[56]

Vascular diseases

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CYR61 is overexpressed in vascular smooth muscle cells of atherosclerotic lesions and in the neointima of restenosis after balloon angioplasty, both in rodent models and in humans.[20][22][57][58] Suppression of CYR61 expression results in reduced neointimal hyperplasia after balloon angioplasty, an effect that is reversed by delivery of CYR61 via gene transfer[59][60] In a mouse model of oxygen-induced retinopathy, expression of CYR61 in the vitreous humor produced significant beneficial effects in repairing damaged vasculature.[61]

Cancer

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Angiogenesis is essential for the supply of oxygen and nutrients to nourish the growing tumor.[62] CYR61 is a powerful angiogenic inducer in vivo,[31][32] and it can also promote cancer cell proliferation, invasion, survival, epithelial–mesenchymal transition, and metastasis.[63][64][65][66] Accordingly, forced overexpression of CYR61 enhanced tumor growth in xenografts of breast cancer cells,[67] prostate cancer cells,[64] ovarian carcinoma cells,[68] and squamous carcinoma cells.[69] Clinically, CYR61 expression correlates with the tumor stage, tumor size, lymph node positivity, and poor prognosis in several cancers, including breast cancer,[67][70][71][72][73] prostate cancer,[74] glioma,[75] gastric adenocarcinoma,[76] and squamous cell carcinoma.[69]

However, CYR61 can also induce apoptosis and cellular senescence,[25][28][77] two well-established mechanisms of tumor suppression[78] Thus, whereas CYR61 can promote the proliferation of prostate cancer cells, it can also exacerbate apoptosis of these cells in the presence of the immune surveillance molecule TRAIL.[52][64][79] CYR61 has an inhibitory effect on some cancers, and suppresses tumor growth of non-small-cell lung cancer (NSCLC) cells,[80] endometrial adenocarcinoma cells,[81] and in melanoma cells.[82]

References

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