Endocrinology and Metabolism

Original Articles

Thyroid
Combined Effects of Baicalein and Docetaxel on Apoptosis in 8505c Anaplastic Thyroid Cancer Cells via Downregulation of the ERK and Akt/mTOR Pathways: Chan Ho Park, Se Eun Han, Il Seong Nam-Goong, Young Il Kim, Eun Sook Kim; Endocrinol Metab. 2018;33(1):121-132. Published online March 21, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.1.121

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Background

Anaplastic thyroid cancer (ATC) is one of the most lethal human malignancies. Docetaxel, a microtubule stabilizer, is a common chemotherapeutic agent used to treat various metastatic cancers. However, prolonged use results in various side effects and drug resistance. Flavonoids, such as baicalein, are accepted chemotherapeutic and dietary chemopreventive agents with many advantages, such as greater accessibility, affordability, and lower toxicity, compared with traditional chemotherapy agents. In this study, we evaluated whether baicalein enhances the effects of docetaxel on apoptosis and metastasis in 8505c ATC cells.

Methods

The 8505c cells were treated with baicalein or docetaxel individually and in combination. Cell viability was measured by MTT (thiazolyl blue tetrazolium bromide) assay, and apoptosis was detected by fluorescence microscopy of Hoechst-stained cells. The expression of apoptotic (Bax and caspase-3), anti-apoptotic (Bcl-2), angiogenic (vascular endothelial growth factor [VEGF], transforming growth factor β [TGF-β], E-cadherin, and N-cadherin), and signaling (extracellular signal-regulated kinase [ERK] mitogen activated protein kinase [MAPK], Akt, and mammalian target of rapamycin [mTOR]) proteins was determined by Western blot analysis.

Results

The combination of baicalein (50 or 100 µM) and docetaxel (10 nM) significantly inhibited proliferation and induced apoptosis compared with monotherapies. The combination treatment significantly inhibited the expression of Bax, caspase-3, VEGF, TGF-β1, E-cadherin, N-cadherin, and mTOR, but decreased the expression of Bcl-2 and significantly decreased the phosphorylation of ERK and Akt.

Conclusion

The combination of baicalein and docetaxel effectively induced apoptosis and inhibited metastasis in 8505c cells through downregulation of apoptotic and angiogenic protein expression and blocking of the ERK and Akt/mTOR pathways in 8505c cells. These results suggest that baicalein enhances the anticancer effects of docetaxel in ATC.

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Thyroid
Curcumin Enhances Docetaxel-Induced Apoptosis of 8505C Anaplastic Thyroid Carcinoma Cells: Jung Min Hong, Chan Sung Park, Il Seong Nam-Goong, Yon Seon Kim, Jong Cheol Lee, Myung Weol Han, Jung Il Choi, Young Il Kim, Eun Sook Kim; Endocrinol Metab. 2014;29(1):54-61. Published online March 14, 2014; DOI: https://doi.org/10.3803/EnM.2014.29.1.54

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Background

Anaplastic thyroid cancer (ATC) is one of the most aggressive malignancies in humans, and its progression is poorly controlled by existing therapeutic methods. Curcumin has been shown to suppress inflammation and angiogenesis. In this study, we evaluated whether curcumin could augment docetaxel-induced apoptosis of ATC cells. We also analyzed changes in nuclear factor κB (NF-κB) and cyclooxygenase-2 (COX-2) expression levels to delineate possible mechanisms of their combined action.

Methods

ATC cells were cultured and treated with curcumin and docetaxel alone or in combination. The effects on cell viability were determined by MTS assay. Apoptosis was assessed by annexin V staining and confirmed by flow cytometric analysis. Caspase, COX-2, NF-κB levels were assayed by Western blotting.

Results

Curcumin combined with docetaxel led to lower cell viability than treatment with docetaxel or curcumin alone. Annexin V staining followed by flow cytometric analysis demonstrated that curcumin treatment enhanced the docetaxel-induced apoptosis of ATC cells. Additionally, curcumin inhibited docetaxel-induced p65 activation and COX-2 expression.

Conclusion

We conclude that curcumin may enhance docetaxel's antitumor activity in ATC cells by interfering with NF-κB and COX-2. Our results suggest that curcumin may emerge as an attractive therapeutic candidate to enhance the antitumor activity of taxanes in ATC treatment.

Citations

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The Effect of Oxidative Stress on the Proliferation and Differentiation of Human Bone Marrow Stromal Cell-Derived Osteoblasts.: Eun Sook Oh, Ki Hyun Baek, Won Young Lee, Ki Won Oh, Hye Soo Kim, Je Ho Han, Kwang Woo Lee, Ho Young Son, Sung Koo Kang, Moo Il Kang; J Korean Endocr Soc. 2006;21(3):222-232. Published online June 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.3.222

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Abstract PDF

BACKGROUND
The objectives of our study were to assess the effects of oxidative stress on the proliferation, differentiation and apoptosis of human bone marrow stromal cell (BMSC)-derived osteoblasts and to explore pathways by which osteoblast cell apoptosis was induced. METHODS: Mononuclear cells including BMSCs were cultured to osteoblastic lineage. Different doses of hydrogen peroxide (H2O2) were added to the culture media. The colony forming units-fibroblastic (CFU-Fs) were stained with crystal violet and alkaline phosphatase (ALP). The MTT assay was done to see the effect of H2O2 on cell viability. The effect of H2O2 on osteocalcin gene expression was determined by RT-PCR. The matrix calcification measurement was performed. FACS analysis was performed to determine the osteoblasts apoptosis. Caspase-3, -8 and 9 activity assay and cytochrome c release were measured. RESULTS: The size and number of ALP (+) CFU-Fs were also decreased by H2O2 treatment. When compared with the control group, H2O2 significantly decreased the total number of cells of each culture well during MTT assay. H2O2 significantly diminished expression of osteocalcin mRNA. N-acetylcystein (NAC) blocked the diminution of cell viability and the inhibition of osteocalcin mRNA expression by H2O2. H2O2 reduced matrix calcification. FACS analysis revealed H2O2 increased percentage of apoptotic cells. Addition of H2O2 resulted in the increase of caspase-9 and -3 activity but not caspase-8, and release of cytochrome c to the cytosol. CONCLUSION: These data suggest that, in primary human BMSCs, oxidative stress inhibits proliferation of stromal cells and inhibits the differentiation to osteoblastic lineage. In addition, oxidative stress induces apoptosis of human BMSC-derived osteoblasts and this may be mediated by mitochondrial pathway of apoptotic signal.

Citations

Citations to this article as recorded by

Antioxidaitve and Differentiation Effects of Artemisia capillaris T. Extract on Hydrogen Peroxide-induced Oxidative Damage of MC3T3-E1 Osteoblast Cells
Jee-Eun Seo, Eun-Sun Hwang, Gun-Hee Kim
Journal of the Korean Society of Food Science and Nutrition.2011; 40(11): 1532. CrossRef

Mechanism of Castration-induced Apoptosis of Ventral Prostate in Rat.: Chung Park, Jong Il Park, Eun Jin Yun, Kyoung Sub Song, Jong Seok Kim, Young Rae Kim, Sang Do Lee, Seung Keil Park, Byung Doo Hwang, Kyu Lim; J Korean Endocr Soc. 2005;20(3):230-241. Published online June 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.3.230

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Abstract PDF: BACKGROUND
S: Castration-induced androgen deprivation triggers a sequence of events, which activates apoptotic cell death of the androgen-dependent epithelial cells within the rat ventral prostate. To investigate the mechanism of castration-dependent apoptosis in the rat ventral prostate, the regulation of apoptosis-related genes was been investigated. METHODS: Azaline B was subcutaneously injected into Sprague-Dawley rat. The Fas receptor (Fas), Fas ligand (FasL) and bcl-2 mRNA, as well as the protein levels were detected by RT-PCR and Western blot analyses. Azaline B-dependent apoptosis was determined using TUNEL and a DNA fragmentation assay. The transacting factor of the FasL promoter was identified by DNA footprinting and a DNA mobility shift assay. RESULTS: The rat prostate was regressed after castration, with and the involuted ventral prostate regenerated by testosterone pretreatment, but not by that with FSH. Apoptosis of the ventral prostate was detected, after castration, using toluidine blue staining, a TUNEL assay and an apoptotic DNA fragmentation assay. The levels of Fas, FasL mRNA and protein were increased after castration. In the DNase I footprinting assay, using the FasL promoter and a nuclear extract prepared from a control prostate, at least two sites were protected: the SP-1 binding site at -283 bp and the prostate-unidentified factor(P-UF) binding site at -247 bp. The SP-1 binding activity vanished in the nuclear extract prepared from castrated rats. In the DNA mobility shift assay, the SP-1 binding activity was slightly decreased after castration. Both the Bcl-2 mRNA and Bcl-2 protein were downregulated after castration. CONCLUSION: These results suggest that the Fas/FasL system and Bcl-2 may be important to castrationdependent apoptosis in the rat ventral prostate, with SP-1 related to the castration-dependent regulation of the FasL gene

Insulin-dependent Stimulation of a Subtype of p38Map Kinases and Its Role in Insulin's Antiapoptotic Activity.: Shin Hae Kang, Ji Hoon Kang, Hee Kyoung Kang, Dae Ho Lee, Young Ki Lee, Deok Bae Park; J Korean Endocr Soc. 2004;19(4):358-368. Published online August 1, 2004

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Abstract PDF: BACKGROUND
The p38 mitogen-activated protein kinases (p38Map kinases) are a family of prolinedirected serine/threonine kinases. At least four isoforms of p38Map kinases have been identified; however, their physiological significances remain to be understood. Recently, the role of p38Map kinase in insulin-stimulated glucose uptake has been suggested. The present study aimed to investigate which isoform(s) were responsive to insulin stimulation. In addition, the activities of p38 Map kinase isoforms that may participate in the insulin's antiapoptotic function in CHO-IR cells were also determined. METHODS: Chinese hamster ovary cells, expressing wild- or mutated human insulin receptors (CHO-IR cells), were used to investigate whether insulin can stimulate any of the isoform(s) of the p38Map kinases. The p38Map kinase activity was determined by measuring the degree of 32P-labelling of ATF-2 protein, a specific substrate of p38Map kinase. A DNA laddering assay was performed to examine the degree of apoptosis and a RT-PCR analysis to determine which isoform(s) of the p38Map kinases were expressed in response to insulin. RESULTS: p38Map kinase activation by insulin was sharply suppressed in only the CHO-IR/A1018K cells, which lack the intrinsic tyrosine kinase activity of insulin receptors. Insulin stimulation of p38Map kinase was insensitive to SB203580, an inhibitor of the alpha(alpha)-and beta(beta)-isoforms of p38Map kinases. Moreover, orthovanadate, known as a specific stimulator of the gamma(gamma)-and delta(delta-) isoforms, stimulated the p38Map kinase activity in CHO-IR cells. Insulin increased the degree of mRNA expression of the delta-isoform, but not that of the alpha-isoform p38Map kinase. Interestingly, PD98059, an inhibitor of ERK, suppressed p38Map kinase stimulation, as well as the antiapoptotic protection of cells by insulin. As insulin was found to still protect ERK-lacking cells (CHO-IR/ SOS) from apoptosis, any substantial role(s) of ERK might be excluded. CONCLUSION: Our data suggest that insulin may stimulate the activity and expression of the-isoform of p38Map kinase in a MEK1/2-dependent manner. The involvement of the delta-isoform of p38Map kinase in insulin's antiapoptotic protection was also suggested, but remains to be investigated further to clarify the nature of its mechanism of action

Effect of Estrogen on H2O2 Induced Apoptosis of FRTL-5 Cells.: Won Bae Kim, Tae Yong Kim, Ja Young Song, Young Kee Shong; J Korean Endocr Soc. 2004;19(4):320-331. Published online August 1, 2004

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Abstract PDF: BACKGROUND
Understanding the pathways and controlling mechanisms of thyrocyte apoptosis is important for the elucidation of the pathogenesis of goiter or thyroid cancer. A system for evaluating apoptosis, in FRTL-5 cells, triggered by hydrogen peroxide (H2O2), a highly likely apoptogenic signal in physiologic condition, was be set up to see the effects of TSH and estrogen on H2O2-induced apoptosis. METHOD: DNA laddering was used in the optimization process or the conditions of the set-up of system for the evaluation of apoptosis in the FRTL-5 cells. To quantify the apoptosis under the optimized conditions, histone-bound DNA fragments in the cytoplasm were measured by ELISA. RESULTS: 1) The optimized conditions for induction of apoptosis in the FRTL-5 cells by H2O2 were; observation of DNA laddering 18~24 hrs after the addition of 0.3 mM H2O2 to cells maintained in TSH-free, low serum containing media (5H1 or 5H0 media) for 48 hrs. 2) Exposure of the FRTL-5 cells to TSH (1 mU/L) for more than 48 hrs (6H0 media). before the addition of H2O2 significantly decreased the degree of apoptosis, compared to cells maintained under TSH-free conditions (0.98+/-0.21 vs. 2.27 0.11 arbitrary unit, p<0.05), whereas exposure for 24 hrs. did not. 3) Exposure of the FRTL-5 cells to high dose 17- estradiol (1-100 M) significantly decreased the degree of H2O2-induced apoptosis in a dose dependent manner. The addition of serum (1%) blunted the effects of estrogen on H2O2-induced apoptosis, and TSH totally abrogated the estrogen effect.Physiologic doses of estrogen (10~100 nM) showed no suppressive effects on H2O2-induced apoptosis in FRTL-5 cells. CONCLUSION: A system for evaluating apoptosis in FRTL-5 cells triggered by hydrogen peroxide (H2O2), a highly likely apoptogenic signal in physiologic condition, was set up, and found for the first time that high dose estrogen suppressed the H2O2-induced apoptosis in FRTL-5 cells

Effects of Glucocorticoid on Apoptosis of Human Bone Marrow Osteogenic Stromal Cells.: Ha Young Kim, Duk Jae Kim, Si Yeol Lee, Jeong Soo Hong, Dong Kwan Kim, Ghi Su Kim; J Korean Endocr Soc. 2002;17(1):23-31. Published online February 1, 2002

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Abstract PDF: BACKGROUND
Osteoporosis is one of the most serious side effects of long-term glucocorticoid therapy, but the mechanism of glucocorticoid-induced bone loss remains poorly defined. Glucocorticoid induces decreased bone formation and death of isolated segments of bone (osteonecrosis) suggesting that glucocorticoid excess may affect the birth or death rate of bone cells and thereby reduce their numbers. It has been known that reduction in bone formation is due to reduced proliferation in osteoblast precursor cells and reduced matrix synthesis in mature osteoblast. Here, we present evidence for dexamethasone-induced apoptosis on human bone marrow stromal cells (hBMSC). To understand the mechanism of glucocorticoid-induced osteoporosis, we investigated the effects of glucocorticoid on primary cultured hBMSC. METHEODS: Treatment with dexamethasone at the concentration of 10-9 M for 3~5 days significantly decreased cleavage tetrazolium salt WST-1 level/concentration by mitochondrial dehydrogenase in viable cells. Greater decrease was observed with higher concentration of dexamethasone (10-7 M, and 10-5 M). Apoptosis was measured by annexin V binding/propidium iodide using fluorescence-activated cell sorter (FACS) analysis and nuclear morphology stained with the fluorescence dye, Hoechst 33342. RESULTS: The level/concentration of apoptotic hBMSC (annexin V positive / PI negative) was increased with 10-9 M dexamethasone (1.2% to 5.3%) and further increased with 10-7 M, and 10-5 M concentration (11.7% and 12.5%, respectively). The same result was observed with Hoechst 33342 staining. CONCLUSION: These results indicate that glucocorticoid induces apoptosis on osteoblast precursor cell, hBMSC, and may contribute to decrease bone formation

Peroxiredoxin I and II are Involved in Hydrogen Peroxide Regulation in FRTL-5 Thyroid Cells.: Ho Kim, Tae Hoon Lee, Eun Shin Park, Jae Mi Suh, Soo Jung Park, Hyo Kyun Chung, Hyun Jin Kim, Soo Hong Chae, Do Hee Kim, O Yu Kwon, Young Kun Kim, Min Ho Shong, Heung Kyu Ro; J Korean Endocr Soc. 2000;15(1):55-69. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Peroxiredoxins (Prx) play an important role in regulating cellular differentiation and proliferation in several types of mammalian cells. One mechanism for this action involves modulation of hydrogen peroxide (H2O2)-mediated cellular responses. This report examines the expression of Prx I and Prx II in thyroid cells and their roles in eliminating H2O2 produced in response to TSH. METHODS: The expression of Prx-I and Prx-II were quantiated in FRTL-5 after stimulation with Thyroid stimulating hormone (TSH), Forskolin (FSK), Methimazole (MMI) and hydrogen peroxide (H2O2). Transient transfections were carried out with FRTL-5 cells at 80% confluency and 20microgram of pCRprx I and pCRprx II or equivalent molar amounts of the pCR3.1TM basic vector. Transient transfection used an electroporation technique. Intracellular H2O2 was assayed in FRTL-5 cells with a fluorescent dye, 2', 7'-dichlorofluoresceindiacetate (DCFH-DA). Apoptosis of cells were evaluated by using an detection kit (Promega, Inc., Madison, WI). RESULTS: Prx I and Prx II are constitutively expressed in FRTL-5 thyroid cells. Prx I expression, but not Prx II expression, is stimulated by exposure to TSH and H2O2. In addition, methimazole (MMI) induces a high level of Prx I mRNA and protein in these cells. Overexpression of Prx I and Prx II enhance the elimination of H2O2 produced by TSH in FRTL-5 cells. Treatment with 500microM H2O2 causes apoptosis in FRTL-5 cells as evidenced by standard assays of apoptosis (i.e., terminal deoxynucleotidyl transferase deoxyuridine triphosphate-biotin nick end-labeling (TUNEL), BAX expression and PARP cleavage. Overexpression of Prx I and Prx II reduces the amount of H2O2-induced apoptosis measured by these assays. CONCLUSION: These results suggest that Prx I and Prx II are involved in the removal of H2O2 in thyroid cells, and can protect these cells from undergoing apoptosis. These proteins are likely to be involved in the normal physiological response to TSH-induced production of H2O2 in thyroid cells.

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