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RASSF1A Suppresses Cell Migration through Inactivation of HDAC6 and Increase of Acetylated alpha-Tubulin
Hae-Yun Jung, Jun Seok Jung, Young Mi Whang, Yeul Hong Kim
Cancer Res Treat. 2013;45(2):134-144.   Published online June 30, 2013
DOI: https://doi.org/10.4143/crt.2013.45.2.134
AbstractAbstract PDFPubReaderePub
PURPOSE
The RAS association domain family protein 1 (RASSF1) has been implicated in a tumor-suppressive function through the induction of acetylated alpha-tubulin and modulation of cell migration. However, the mechanisms of how RASSF1A is associated with acetylation of alpha-tubulin for controlling cell migration have not yet been elucidated. In this study, we found that RASSF1A regulated cell migration through the regulation of histon deacetylase 6 (HDAC6), which functions as a tubulin deacetylase.
MATERIALS AND METHODS
The cell migration was assessed using wound-healing and transwell assays. The role of RASSF1A on cell migration was examined by immunofluorescence staining, HDAC activity assay and western blot analysis.
RESULTS
Cell migration was inhibited and cell morphology was changed in RASSF1A-transfected H1299 cells, compared with controls, whereas HDAC6 protein expression was not changed by RASSF1A transfection in these cells. However, RASSF1A inhibited deacetylating activity of HDAC6 protein and induced acetylated alpha-tubulin expression. Furthermore, acetylated alpha-tubulin and HDAC6 protein were co-localized in the cytoplasm in RASSF1A-transfected H1299 cells. Conversely, when the endogenous RASSF1A expression in HeLa cells was blocked with RASSF1A siRNA treatment, acetylated alpha-tubulin was co-localized with HDAC6 protein throughout the whole cells, including the nucleus, compared with scramble siRNA-treated HeLa cells. The restoration of RASSF1A by 5-Aza-dC treatment also induced acetylated alpha-tubulin through inhibition of HDAC6 activity that finally resulted in suppressing cell migration in H1299 cells. To further confirm the role of HDAC6 in RASSF1A-mediated cell migration, the HDAC6 expression in H1299 cells was suppressed by using HDAC6 siRNA, and cell motility was found to be decreased through enhanced acetylated alpha-tubulin.
CONCLUSION
The results of this study suggest that the inactivation of HDAC6 by RASSF1A regulates cell migration through increased acetylated alpha-tubulin protein.

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    Clinical and Translational Medicine.2025;[Epub]     CrossRef
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    European Journal of Cell Biology.2022; 101(2): 151202.     CrossRef
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    Cell Death & Differentiation.2019; 26(8): 1379.     CrossRef
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    Mohammad Reza Zinatizadeh, Seyed Ali Momeni, Peyman Kheirandish Zarandi, Ghanbar Mahmoodi Chalbatani, Hassan Dana, Hamid Reza Mirzaei, Mohammad Esmaeil Akbari, Seyed Rouhollah Miri
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    Fatéméh Dubois, Emmanuel Bergot, Gérard Zalcman, Guénaëlle Levallet
    Cell Death & Disease.2019;[Epub]     CrossRef
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No Association between Promoter Polymorphism of STK11 Gene and Lung Cancer Risk in the Korean Population
Jae Sook Sung, Young Mi Whang, Kyong Hwa Park, Jeong-Seon Ryu, Jong Gwon Choi, Jae Hong Seo, Sang Won Shin, Jun Suk Kim, Yeul Hong Kim
Cancer Res Treat. 2009;41(4):211-217.   Published online December 31, 2009
DOI: https://doi.org/10.4143/crt.2009.41.4.211
AbstractAbstract PDFPubReaderePub
Purpose

Serine-threonine kinase11 (STK11) was originally identified in 1997 as the causative mutation that's responsible for Peutz-Jeghers Syndrome (PJS). Several recent studies have reported that the STK11 gene is an important human tumor suppressor gene in lung cancer. We evaluated the associations between the polymorphisms of the STK11 promoter region and the risk of lung cancer in 901 Koreans.

Materials and Methods

By direct sequencing, we first discovered three novel polymorphisms (-1,795 T>C, -981 C>T and -160 G>T) and four known polymorphisms (-1,580 C>T, -1,494 A>C, -881 A>G and -458 G>C) of the STK11 promoter region in 24 blood samples of 24 Korean lung cancer patients. Further genotype analyses were then performed on 443 lung cancer patients and 458 controls.

Results

We discovered three novel polymorphisms and we identified four known polymorphisms of the STK11 promoter region in a Korean population. Statistical analyses revealed that the genotypes and haplotypes in the STK11 gene were not significantly associated with the risk of lung cancer in a Korean population.

Conclusion

This is the first study that's focused on the association of STK11 promoter polymorphisms and the risk of lung cancer in a Korean population. To evaluate the role of the STK11 gene for the risk of lung cancer, the genotypes of the STK11 promoter region (-1,795 T>C, -1,494 A>C and -160 G>T) were determined in 901 Koreans, yet the result revealed no significant difference between the lung cancer patients and the controls. These results suggest that the three promoter polymorphisms we studied are not important risk factors for the susceptibility to lung cancer in Koreans.

Citations

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  • A polymorphic minisatellite region of BORIS regulates gene expression and its rare variants correlate with lung cancer susceptibility
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AKAP12α is Associated with Promoter Methylation in Lung Cancer
Ukhyun Jo, Young Mi Whang, Han Kyeom Kim, Yeul Hong Kim
Cancer Res Treat. 2006;38(3):144-151.   Published online June 30, 2006
DOI: https://doi.org/10.4143/crt.2006.38.3.144
AbstractAbstract PDFPubReaderePub
Purpose

Promoter methylation is an important mechanism for silencing tumor-suppressor genes in cancer and it is a promising tool for the development of molecular biomarkers. The purpose of the present study was to investigate whether inactivation of the A Kinase Anchoring Protein 12 (AKAP12) gene is assoCiated with promoter methylation in lung cancer.

Materials and Methods

The AKAP12 expression was examined by reverse transcription-polymerase chain reaction (RT-PCR) in ten lung cancer cell lines. The methylation status of the AKAP12α promoter was analyzed by performing bisulfite sequencing analysis in ten lung cancer cell lines, twenty four lung tissues and matched normal tissues.

Results

The AKAP12α expression was reduced in 6 of 10 (60%) lung cancer cell lines, whereas the AKAP12β expression was absent in 1 of 10 (10%) lung cancer cell lines. The AKAP12α expression was restored after treatment with the demethylating agent 5-aza-2'-deoxycytidine in three lung cancer cell lines. Methylation of CpG island 1 in the AKAP12α promoter was detected in 30% of the lung cancer cell lines, whereas methylation of CpG island 2 in the AKAP12α promoter was observed in the immortalized bronchial cell line and in all the lung cancer cell lines. In lung tumors, the CpG island 1 in the AKAP12α promoter was infrequently methylated. However, CpG island 2 in the AKAP12α promoter was highly methylated in lung tumors compared with the surrounding normal tissues, and this was statistically significant (p=0.0001).

Conclusion

Our results suggest that inactivation of the AKAP12α expression is assoCiated with DNA methylation of the promoter region in lung cancer, and that AKAP12α may play an important role in lung cancer carcinogenesis.

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    Irwin Gelman
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Retinoic Acid Enhances Drug-Induced Cell Death in Anticancer Drug-Resistant Cell Lines
Young Mi Whang, Yeul Hong Kim, Sang Won Shin, Byung Soo Kim, Jun Suk Kim, Young Do Yoo, Sun Hee Park
Cancer Res Treat. 2002;34(3):212-217.   Published online June 30, 2002
DOI: https://doi.org/10.4143/crt.2002.34.3.212
AbstractAbstract PDF
PURPOSE
Retinoids (RA), a group of vitamin A derivatives, is known to be important for regulation of normal cellular growth and differentiation. RA treatment of various cancers resulted in cell growth inhibition and apoptosis. Therefore, the chemotherapeutic and chemopreventative activities of various types of tumor have been examined. Biological actions of RA are mediated through nuclear receptors, including the retinoic acid receptors (RARs) and retinoid X receptors (RXRs). In this study, we examined the effect of all-trans-retinoic acid (atRA) as an anticancer drug-sensitiser in cancer cell lines and in its drug- resistant cancer cell lines MATERIALS AND METGODS: Cells were maintained by RPMI 1640 medium containing 10% fetal bovine serum. Cells were treated with 1 micro M atRA for 48 h, then with the desired concentration of anticancer drug for 24 h. Cell viability was measured spectrophotometrically at 540 nm using the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] assay. Western blot analyses were performed with the desired antibodies.
RESULTS
We investigated if pre-treatment with atRA enhanced the drug-sensitivity of various cancer cell lines to either 5-fluorouracil, adriamycin, or cisplatin. 5-FU (SNU638-F2) and CDDP-resistant cell (SNU638-Cis) lines, from a Korean gastric cancer cell line (SNU638) and the ADR-resistant cells (AD600) was established from a colon cancer cell line (SW620). Treatment of each cell line, with 1 micro M atRA, prior to drug exposure resulted in enhanced cell death in these cell lines. Furthermore, the effect of atRA on growth inhibition, in each drug-resistant cell line, was more obvious than in their parent cell lines. Increased activity of Transglutaminase II (TgaseII) and cleavage of Poly (ADP-ribose) polymerase (PARP) were also observed (western blot analysis CONCLUSION: Based on our data, we suggest that atRA enhances anticancer drug-induced cell death and reverses the drug-sensitivity of the drug-resistant cancer cell lines.

Citations

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  • All-trans Retinoic Acid Sensitizes Epithelial Ovarian Cancer to PARP Inhibition after Exposure to Cisplatin
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    Molecular Cancer Therapeutics.2025; 24(3): 453.     CrossRef
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