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Antitumor Effect of KX-01 through Inhibiting Src Family Kinases and Mitosis
김선경,민아름,이경훈,양예원,김태용,임지민,박소정,남현진,김정은,송상현,한세원,오도연,김지현,김태유,David Hangauer,Johnson Yiu-Nam Lau,임경옥,이동순,방영주,임석아 대한암학회 2017 Cancer Research and Treatment Vol.49 No.3
Purpose KX-01 is a novel dual inhibitor of Src and tubulin. Unlike previous Src inhibitors that failed to show clinical benefit during treatment of breast cancer, KX-01 can potentially overcome the therapeutic limitations of current Src inhibitors through inhibition of both Src and tubulin. The present study further evaluates the activity and mechanism of KX-01 in vitro and in vivo. Materials and Methods The antitumor effect of KX-01 in triple negative breast cancer (TNBC) cell lines was determined by MTT assay. Wound healing and immunofluorescence assays were performed to evaluate the action mechanisms of KX-01. Changes in the cell cycle and molecular changes induced by KX-01 were also evaluated. A MDA-MB-231 mouse xenograft model was used to demonstrate the in vivo effects. Results KX-01 effectively inhibited the growth of breast cancer cell lines. The expression of phospho- Src and proliferative-signaling molecules were down-regulated in KX-01–sensitive TNBC cell lines. In addition, migration inhibition was observed by wound healing assay. KX-01– induced G2/M cell cycle arrest and increased the aneuploid cell population in KX-01–sensitive cell lines. Multi-nucleated cells were significantly increased after KX-01 treatment. Furthermore, KX-01 effectively delayed tumor growth in a MDA-MB-231 mouse xenograft model. Conclusion KX-01 effectively inhibited cell growth and migration of TNBC cells. Moreover, this study demonstrated that KX-01 showed antitumor effects through the inhibition of Src signaling and the induction of mitotic catastrophe. The antitumor effects of KX-01 were also demonstrated in vivo using a mouse xenograft model.
Prognostic Role of Androgen Receptor Expression in Surgically Resected Early Breast Cancer Patients
양예원,민아름,이경훈,유한석,김태용,우고운,서경진,이대원,이한별,문형곤,한원식,박인애,노동영,임석아 한국유방암학회 2020 Journal of breast cancer Vol.23 No.2
Purpose: Endocrine therapy is a standard treatment for hormone receptor-positive breast cancer, which accounts for 60%–75% of all breast cancer. Hormone receptor positivity is a prognostic and predictive biomarker in breast cancer. Approximately 50%–80% of breast cancer is also positive for androgen receptor (AR), but the prognostic and predictive value of AR expression in breast cancer is controversial. Here, we investigated AR expression and its prognostic value in patients with surgically resected breast cancer in Korea. Methods: We retrospectively reviewed the medical records of patients who had surgically resected breast cancer to collect AR expression data and other clinicopathological data. The optimal cut-off for AR positivity was determined using a receiver operating characteristic curve analysis. Results: We reviewed 957 patients with surgically resected breast cancer from June 2012 to April 2013. The median follow-up was 62 months, and relapse events occurred in 101 (10.6%) patients. Unlike the cut-off value of 1% or 10% in previous reports, 35% was determined to be best for predicting relapse-free survival (RFS) in this study. At the cut-off value of 35%, 654 (68.4%) patients were AR-positive. AR expression was more prevalent in luminal A (87.6%) and luminal B (73.1%) types than in human epidermal growth factor receptor 2-positive (56.2%) or triple-negative (20.6%) types. AR expression of ≥ 35% was significantly related to longer RFS in a multivariate analysis (hazard ratio, 0.430; 95% confidence interval, 0.260– 0.709; p = 0.001). Conclusion: We propose a cut-off value of 35% to best predict RFS in patients with surgically resected breast cancer. AR expression was positive in 68.4% of patients, and AR positivity was found to be an independent prognostic factor for longer RFS.
이미소,이경훈,민아름,김정은,김성영,장혜민,임지민,김소현,하동현,정원재,서경진,양예원,김태용,오도연,방영주,임석아 대한암학회 2019 Cancer Research and Treatment Vol.51 No.2
Purpose Pim kinases are highly conserved serine/threonine kinases, and different expression patterns of each isoform (Pim-1, Pim-2, and Pim-3) have been observed in various types of human cancers, including gastric cancer. AZD1208 is a potent and selective inhibitor that affects all three isoforms of Pim. We investigated the effects of AZD1208 as a single agent and in combination with an Akt inhibitor in gastric cancer cells. Materials and Methods The antitumor activity of AZD1208 with/without an Akt inhibitor was evaluated in a large panel of gastric cancer cell lines through growth inhibition assays. The underlying mechanism was also examined by western blotting, immunofluorescence assay, and cell cycle analysis. Results AZD1208 treatment decreased gastric cancer cell proliferation rates and induced autophagy only in long-term culture systems. Light chain 3B (LC3B), a marker of autophagy, was increased in sensitive cells in a dose-dependent manner with AZD1208 treatment, which suggested that the growth inhibition effect of AZD1208 was achieved through autophagy, not apoptosis. Moreover, we found that cells damaged by Pim inhibition were repaired by activation of the DNA damage repair pathway, which promoted cell survival and led the cells to become resistant to AZD1208. We also confirmed that the combination of an Akt inhibitor with AZD1208 produced a highly synergistic effect in gastric cancer cell lines. Conclusion Treatment with AZD1208 alone induced considerable cell death through autophagy in gastric cancer cells. Moreover, the combination of AZD1208 with an Akt inhibitor showed synergistic antitumor effects through regulation of the DNA damage repair pathway.
Infrared Spectroscopy of Imidazole Trimer in Helium Nanodroplets: Free NH Stretch Mode
Seulki Lee,Seung Jun Lee,Ahreum Ahn,Yusic Kim,민아름,최명룡,Roger E. Miller 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
We report the first vibrational band assignment of imidazole trimer (IMT) solvated in helium nanodroplets. Several congested vibrational bands of imidazole (IM) clusters were obtained in the frequency region of 3513-3515 cm^(−1) and vibrationally resolved due to the extremely low temperature (0.37 K) and very weak solutesolvent interaction environments of helium droplets. The unambiguous free NH band assignment was achieved with an aid of pick-up oven temperature dependence and vibrational transition moment angle (VTMA)experiments as well as density functional theory (DFT) calculations. The band at 3514.3 cm^(−1) is attributed to the free NH stretching mode of linear IMT clusters, easily formed by the dipole-dipole interactions of IM in ultracold helium nanodroplets.