2017
DOI: 10.1371/journal.pone.0172689
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RAC1b overexpression stimulates proliferation and NF-kB-mediated anti-apoptotic signaling in thyroid cancer cells

Abstract: Overexpression of tumor-associated RAC1b has been recently highlighted as one of the most promising targets for therapeutic intervention in colon, breast, lung and pancreatic cancer. RAC1b is a hyperactive variant of the small GTPase RAC1 and has been recently shown to be overexpressed in a subset of papillary thyroid carcinomas associated with unfavorable outcome. Using the K1 PTC derived cell line as an in vitro model, we observed that both RAC1 and RAC1b were able to induce a significant increase on NF-kB a… Show more

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Cited by 23 publications
(18 citation statements)
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“…Rac1b has been associated with poor prognosis in KRAS/BRAF WT metastatic colorectal cancer patients treated with first-line FOLFOX/XELOX therapy (41). Previous studies demonstrate that Rac1b stimulates cell proliferation by enhancing the NF-kB-mediated signaling in colorectal and thyroid cancer cells (12,13,24,42). In our study, we also showed that Rac1b expression provides a proliferative advantage to colorectal cancer cells via activation of the NF-kB pathway.…”
Section: Discussionsupporting
confidence: 77%
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“…Rac1b has been associated with poor prognosis in KRAS/BRAF WT metastatic colorectal cancer patients treated with first-line FOLFOX/XELOX therapy (41). Previous studies demonstrate that Rac1b stimulates cell proliferation by enhancing the NF-kB-mediated signaling in colorectal and thyroid cancer cells (12,13,24,42). In our study, we also showed that Rac1b expression provides a proliferative advantage to colorectal cancer cells via activation of the NF-kB pathway.…”
Section: Discussionsupporting
confidence: 77%
“…Colorectal cancer cell lines with acquired resistance to OXA showed increased activation of NF-kB in comparison to their matched sensitive parental cells, implicating NF-kB as a significant mediator of OXA resistance in these cells (53,54). Our data and others have shown that Rac1b expression activates the NF-kB signaling pathway in colon, lung, and thyroid cancer (12,13,24). Interestingly, we showed that OXA treatment results in upregulation of Rac1b, which leads to further enhanced NF-kB-mediated signaling and a significant shift in the sensitivity to chemotherapeutic agents.…”
Section: Discussionsupporting
confidence: 60%
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“…Increased NF-kB activation has been described in PTC, FTC and anaplastic TC, as being associated with resistance to apoptosis and maintenance of the malignant phenotype [14][15][16]. Also, in previous studies, we have shown that overexpression of tumor-related RAC1b, a highly activated splice variant of the GTPase RAC1 [17,18], has a significant role in PTC tumorigenesis by inducing resistance to programmed cell death through NF-κB activation [19].…”
Section: Introductionmentioning
confidence: 57%
“…NF-κB family of transcription factors is responsible for regulating many cellular processes such as inflammatory responses, cellular growth and cell death, and has been also implicated in TC development. We have previously reported NF-kB activation as a key mechanism through which the tumor-related RAC1b exerts its oncogenic action in the context of PTC [19]. Additionally, we have also recently shown an inverse correlation between RAC1b overexpression and NIS levels in DTCs [45].…”
Section: Fig 3 Effect Of Tnf-α and Pma On Tsh-induced Iodide Uptake mentioning
confidence: 72%