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Review

The different functions and clinical significances of caveolin-1 in human adenocarcinoma and squamous cell carcinoma

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Pages 819-835 | Published online: 14 Feb 2017

Figures & data

Figure 1 Cav-1 plays an important role in tumor migration, invasion and metastasis by regulating the activity of Rho-GTPases, EMT and MMPs.

Notes: Rho-GTPases: the cooperation between Cav-1 and Rho-GTPase can promote metastasis by the elevated expression of α5-integrin and the enhanced activation of Src, Ras and Erk.Citation42 Moreover, Cav-1 overexpression can increase the phosphorylation of RhoC GTPase by stimulating the activation of AKT1,Citation43 whereas the opposite result exists in pancreatic cancer.Citation44 EMT: Cav-1 overexpression promotes bladder cancer metastasis via inducing EMT by activating the PI3K/AKT signaling pathway, which upregulates Slug expression.Citation14 The decreased expression of Cav-1 can also enhance cancer cell invasion and metastasis by the downregulation of E-cadherin, upregulation of β-catenin and enhancing GSK-3-independent-catenin-TCF/LEF-1 transactivationCitation47 or by stimulating EGFR, then promoting the activation of STAT3, resulting in contributing to the EMT.Citation46 MMPs: Cav-1 mediates tumor invasion and metastasis by negatively regulating the activity of MMP-2, MMP-9 and the expression of MT4-MMPCitation54,Citation55 or by positively regulating the activity of MMP-3 and the expression of MMP2, MMP-9 and MT1-MMP.Citation45,Citation50 The “+” represents the promotion and “−” represents the inhibition.
Abbreviations: Cav-1, caveolin-1; EGFR, epidermal growth factor receptor; EMT, epithelial-to-mesenchymal transition; GSK, glycogen synthase kinase; LEF, lymphoid enhancer factor; MMPs, matrix metalloproteinase; MT, membrane type; PI3K, phosphatidylinositol 3-kinase; STAT3, signal transducer and activator of transcription 3; TCF, T-cell factor.
Figure 1 Cav-1 plays an important role in tumor migration, invasion and metastasis by regulating the activity of Rho-GTPases, EMT and MMPs.

Figure 2 The role of Cav-1 in apoptosis fails to reach a consensus.

Notes: Increased apoptosis: Cav-1 overexpression can promote cell apoptosis by downregulation of EGFR-MAPK signal pathwayCitation6,Citation9 or β-catenin-TCF/LEF-dependent transcriptionCitation60 and its downstream signal molecules survivin.Citation60 However, Cav-1 knockdown also can inhibit the expression of antiapoptotic proteins BCL-2 and BCL-xl. Simultaneously, Cav-1 can negatively regulate the activity of AKT, leading to the upregulation of BIM.Citation61 Decreased apoptosis: Cav-1 inhibits anoikis by upregulation of IGF-IR expression and IGF-I-induced signaling via the PI3K/AKT pathway.Citation62 Moreover, the elevated expression of Cav-1 can maintain phosphorylated AKT through scaffolding binding site interaction and inhibition of PP1 and PP2A.Citation63 Furthermore, Cav-1 overexpression also significantly reduces staurosporine-induced apoptosis by downregulation of the ceramide via inhibiting the activity of neutral sphingomyelinase, the decreased ceramide inhibits P13K/AKT pathway-induced cell apoptosis.Citation64 The “+” represents the promotion and “−” represents the inhibition.
Abbreviations: BCL, B-cell lymphoma; Cav-1, caveolin-1; EGFR, epidermal growth factor receptor; EMT, epithelial-to-mesenchymal transition; GSK, glycogen synthase kinase; IGF, insulin-like growth factor; IR, insulin receptor; LEF, lymphoid enhancer factor; MAPKs, mitogen-activated protein kinases; PI3K, phosphatidylinositol 3-kinase; PP, protein phosphatase; TCF, T-cell factor.
Figure 2 The role of Cav-1 in apoptosis fails to reach a consensus.

Table 1 The different functions of Cav-1 in human adenocarcinoma

Table 2 The different functions of Cav-1 in human SCC

Table 3 The role of Cav-1 in different histological types of the same organ