Journal of Yeungnam Medical Science

Seong Yong Kim

8 Articles

Trends in the study on medical education over the last 10 years, based on paper titles: Seong Yong Kim; Yeungnam Univ J Med. 2019;36(2):78-84. Published online May 13, 2019; DOI: https://doi.org/10.12701/yujm.2019.00206

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Medical education research subjects are incredibly diverse and have changed over time. This work in particular aims to compare and analyze research trends in medical education through the words used in the titles of these research papers. Academic Medicine (the journal of the Association of American Medical Colleges), Medical Teacher (the journal of the Association of Medical Education in Europe), the Korean Journal of Medical Education (KJME), and Korean Medical Education Review (KMER) were selected and analyzed for the purposes of this research. From 2009 to 2018, Academic Medicine and Medical Teacher published approximately 10 to 20 times more papers than the KJME and KMER. Frequently used words in these titles include “medical,” “student,” “education,” and “learning.” The words “clinical” and “learning” were used relatively often (7.80% to 13.66%) in Korean Journals and Medical Teacher, but Academic Medicine used these phrases relatively less often (6.47% and 4.41%, respectively). Concern with such various topics as problem-based learning, team-based learning, program evaluations, burnout, e-learning, and digital indicates that Medical Teacher seems to primarily deal with teaching and learning methodologies, and Academic Medicine handles all aspects of medical education. The KJME and KMER did not cover all subjects, as they publish smaller papers. However, it is anticipated that research on new subjects, such as artificial intelligence in medical education, will occur in the near future.

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Assessing the effectiveness of massive open online courses on improving clinical skills in medical education in China: A meta-analysis
Ling Yang, Jiao Zou, Junwei Gao, Xiaotang Fan
Heliyon.2023; 9(8): e19263. CrossRef

Apoptosis Induced by 4-HPR on Human Stomach Adenocarcinoma Cell Line SNU1: Hyou Youn Kim, Sang Woon Kim, Seong Yong Kim; Yeungnam Univ J Med. 2007;24(2 Suppl):S606-616. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S606

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Abstract PDF: Purpose：Retinoids derived from vitamin A have diverse effects on development, morphogenesis, and homeostasis. They also have effects for prevention and treatment of cancers. In this study, the effect of N-(4-hydroxyphenyl) retinamide (4-HPR) on growth and/or proliferation of human gastric adenocarcinoma cell line SNU1 was investigated. Materials and Methods：The cytotoxic effect of 4-HPR was assessed by MTT assay. The apoptosis induced by 4-HPR was analyzed with cytoplasmic DNA Fragmentation, flow cytometry, and Western blot.
Results
：4-HPR induced cell death of SNU1. The cytoplasmic DNA fragmentation was increased time dependently after treatment of 4-HPR and the cells in the sub-G₀/G₁ fraction of flow cytometric analysis were also increased time dependently after treatment of 4-HPR. The cleavage of caspase 3 and PARP were detected after treatment of 4-HPR to SNU1. The phosphorylations of Raf, ERK and AKT were induced by 4-HPR but after pre-treatment of MAPK inhibitor (PD98059) or PI-3 kinase inhibitor (LY294002) the 4-HPR-induced cytoplasmic DNA fragmentation, the cells in the sub-G0/G1 fraction fraction of flow cytometric analysis, and cleavage of caspase 3 and PARP were diminished in SNU1 cells.
Conclusion
：The results show that 4-HPR induces apoptosis of SNU1 and this 4-HPRinduced apoptosis may be mediated through ERK1/2 and PI3 kinase signaling pathways in SNU1.

Profile of Gene Expression Changes During Doxorubicin Induced Apoptosis of Saos-2.: Jeong Sook Lim, Min Jae Bae, Suk Hwan Baek, Jae Ryong Kim, Jung Hye Kim, Seong Yong Kim; Yeungnam Univ J Med. 2005;22(2):221-240. Published online December 31, 2005; DOI: https://doi.org/10.12701/yujm.2005.22.2.221

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Abstract PDF: BACKGROUND
Doxorubicin has proved to be a useful chemotherapeutic agent especially for osteogenic sarcoma. It induces cancer cell death via apoptosis. MATERIALS AND METHODS: To explore and analyze the changes of gene expression during doxorubicin induced apoptosis on human osteogenic sarcoma, Saos-2 cell, cDNA microarray was performed. After treatment with doxorubicin, total RNA was purified and expressed genes were investigated with a 17k human cDNA microarray. RESULTS: For analysis of the cDNA microarray, the genes were filtered using the sum of the median value of Cy3 and Cy5 signal intensity of greater than 800. Expression of 264 genes was changed by more than 2 fold, and the expression of 35 genes was changed more than 3 fold after treatment with doxorubicin. The genes were primarily related to cell death, cell growth and maintenance, signal transduction, cellular component, transport, and metabolism. CONCLUSION: Treatment with doxorubicin induced expressional change of many genes. Some of the genes might be related with apoptosis directly or indirectly. Further study is now needed to characterize these genes.

Expression of Multidrug Resistance-associated Protein(MRP), c-myc and c-fos in L1210 Cells.: Seong Yong Kim; Yeungnam Univ J Med. 1997;14(1):67-76. Published online June 30, 1997; DOI: https://doi.org/10.12701/yujm.1997.14.1.67

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Abstract PDF

The occurrence of multidrug resistance (MDR) is one of the main obstacles in the successful chemotherapeutic treatment of cancer. In this study The gene expressions of multidrug resistance-associated protein (MRP), c-myc and c-fos were investigated in L1210 cells. Adriamycin- or vincristine-resistant L1210 cells, L1210AdR or L1210VcR, respectively, has been identified to overexpression of mdrl gene. The expression leve of MRP gene in L1210AdR and L1210Cis was more decreased than that in L1210 cells. The c-myc and c-fos genes were expressed both in L1210 and resistant sublines. In L1210VcR and L1210Cis, c-myc and c-fos genes were decreased than in L1210. However, in L1210VcR and L1210Cis, c-myc and c-fos gene expression were rather increased than L1210. These results suggested that MRP does not contribute in resistance of drug-resistant L1210 cells and there is no relations between MRP and mdrl gene expression. The expression of c-myc and c-fos gene may be changed during transformation of L1210 to drug-resistant sublines.

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Suppression of P-glycoprotein expression by antipsychotics trifluoperazine in adriamycin-resistant L1210 mouse leukemia cells
Soon Young Shin, Byeong Hyeok Choi, Jae-Ryong Kim, Jung-Hye Kim, Young Han Lee
European Journal of Pharmaceutical Sciences.2006; 28(4): 300. CrossRef

Gene Expression of Enzymes Related to Glutathione Metabolism in Anticancer Drug-resistant L1210 Sublines: Seong Yong Kim, Jae Ryong Kim, Jung Hye Kim; Yeungnam Univ J Med. 1995;12(1):32-47. Published online June 30, 1995; DOI: https://doi.org/10.12701/yujm.1995.12.1.32

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Abstract PDF: Glutathione(GSH) has a very important role in detoxification of cells and is closely related to antitumor drug-resistance of cancer cells. In order to evaluate the importance of glutathione metabolism in the drug-resistant cancer cells, the concentration of celluar GSH and activities of y-glutamylcysteine synthetase(GCS), y-glutamyl transpeptidase (GGT) and glutathione S-transferases(GST) in the adriamycin, vincristine, or cisplatin resistant L1210 (L1210AdR; L1210VcR, or L12100s) sublines were measured. Expression and amplification of GCS, GGT, and GST-i7 genes were also observed in the parent L1210 and the drug-resistant L1210 sublines. The concentration of GSH was increased 5.34 fold in L12100s, 2.83 fold in L1210VcR, and 1.78 fo-d in L1210AdR, compared to L1210. The activities of GCS and GGT were -increased in drug-resistant L1210 sublines. The GST activity was increased in L1210VcR and L1210Cis but decreased in L1210AdR compared to L1210. Expression of GCS, GGT, and GST-rr genes were increased in the resistant L1210 sublines compare to the parent L1210 in northern blot analyses. Overexpression of GCS, GGT, and GST-77 were observed in the resistant sublines, and the increases of the concentration of glutathione and the activities of GCS and GGT in the resistant sublines may be involved in a part of the drug-resistance in the resistant sublines.

The Change of Glutathione Metabolism in Liver and Kidney of Cisplatin treated Rats.: Seong Yong Kim, Jae Yong Chung, Jae Ryong Kim, Jung Hye Kim; Yeungnam Univ J Med. 1994;11(2):262-269. Published online December 31, 1994; DOI: https://doi.org/10.12701/yujm.1994.11.2.262

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Abstract PDF: Glutathione (GSH) is a well-known antioxidative cellular component which is ubiquitous in nature. Several enzymes involved in GSH metabolism and recycling have been found to play important roles in detoxification of xenobiotics and free radicals. In this study, total GSH content, activity of GSH peroxidase and GSH reductase were measured in liver and kidney of cisplatin treated rats. Total GSH content (mM/g protein) of liver was higher in cisplatin treated rats (1.51±0.28) than of nontreated control (0.95±0.28), and in kidney, it was also higher in cisplatin treated rats (0.87±0.20) than that of control (0.68±0.14). The activity of GSH peroxidase (µM/mg protein/min) was lower in liver of cisplatin treated rats (348.0±18.54) than that of control (415.5±53.15), in kidney it was increase din cisplatin treated rats (380.5±51.86) compared to control (327.3±20.36). The activity of GSH reductase (µM/mg protein/min) was higher in liver of cisplatin treated rats (3.09±0.88) than that of control (2.28±0.61), in kidney it was also higher in cisplatin treated rats (8.50±2.62) than that of control (3.30±1.10). In summary, detoxification of ciplatin was revealed lesser effect in kidney as show increasion of GSH peroxidase and reductase and detoxification of cisplatin was expressed effectively in liver by increasing of GSH content and decreasing GSH peroxidase.

Membrane protein alterations associated with anticancer drug resistance in mouse lymphoblastic leukemia L1210 cells: Seong Yong Kim, Sung Kweon Son, Jae Ryong Kim, Jung Hye Kim; Yeungnam Univ J Med. 1993;10(2):432-444. Published online December 31, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.2.432

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Abstract PDF

Multidrug resistance (MDR) phenotype is frequently observed in animal and human cancer cell lines selected for in vitro resistance to a single chemotherapeutic agent. It is characterized by the diminished j drug accumulation and is related to the drug efflux mechanism in resistant cells. In the present study, adriamycin resistant cells (L1210-AdR6: 10-6M adriamycin, -AdR5: 10-5M) and vincristine resistant cells (L1210-VcR7: 10-7M vincristine, -VcR6: 10-6M) were produced from mouse lymphoblastic leukemia cell line L1210. Growth profiles of survived cells were observed for 5 days with MTT (thiazolyl blue) assay and resistance was compared with IC50 (drug concentration of 50% survival reduction in absorbance). Resistant cells proliferated more slowly than sensitive cell. Doubling times were 29.7hr in L1210, 68.7 hr in L1210-AdR5 and 58.2 hr in -VcR6. MDRs expressed as resistance factor were as follows, L1210-AdR5 was 76.4 times for vincristine, L1210-VcR6 was 96.4 times for adriamycin. The cell membrane proteins with three different M.W. were recognized to be related resistance, 220, 158, and 88 Kd in L1210-AdR5, 158, 140 and 88 Kd in L1210-VcR6 by SDS-PAG electrophoresis. Cell surface membrane proteins were identified by radio-iodination and autoradiogram. Their molecular weights were 158, 72.8, and 42.4 Kd in L1210-VcR6.

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Suppression of P-glycoprotein expression by antipsychotics trifluoperazine in adriamycin-resistant L1210 mouse leukemia cells
Soon Young Shin, Byeong Hyeok Choi, Jae-Ryong Kim, Jung-Hye Kim, Young Han Lee
European Journal of Pharmaceutical Sciences.2006; 28(4): 300. CrossRef

Analysis of nucleotides and their derivatives in renal tissue of rat during ischemia by HPLC.: Seong Yong Kim, Jung Hye Kim; Yeungnam Univ J Med. 1992;9(1):90-101. Published online June 30, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.1.90

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Abstract PDF: In rat kidney, the changes in concentrations of nucleotides and their derivatives during ischemia induced by renal artery ligation was measured quantitatively with high performance liquid chromatography (HPLC). After the ligation of renal artery for 60minutes, the concentrations of the nucleotides and derivatives to 80.7±18.39 µg (p<0.01); ATP, 307.2±56.68 µg to 47.6±5.95µg (p<0.01); ADP+AMP, 227.1±7.98 µg to 61.4±3.92 µg (P<0.01); NAD+, 217.9±4.49 µg to 126.6±10.44 µg (P<0.01); GTP, 202.5±23.76 µg to 117.7±14.24 µg (P<0.05); GMP, 54.5±9.03µg to 23.7±0.46 µg (p<0.05), and inosine, 16.6±3.45 µg to 7.8±0.87 µg (P<0.05). But hypoxanthine and xanthine were significantly increased from 113.0±15.58µg to 159.7±12.97µg (P<0.05) and from 87.7±6.77µg to 173.1±12.52µg (P<0.01). In ischemic kidney, concentration of ATP was decreased to 39.9% of control at 10 minutes, 19.8% at 30 minutes, and 15.5% at 60 minutes, and ADP+AMP were decreased to 70.3% of control at 10 minutes, 67.3% at 30 minutes, and to 27.0% at 60 minutes, but hypoxanthine and xanthine were increased to 121.5% and 127.1% at 10 minutes, 126.0% and 174.4% at 30 minutes, and 141.4% and 197.3% at 60 minutes. Total adenosine nucleotides were decreased to 20.3% of control during 60 minutes of ischemia, but hypoxanthine and xanthine were increased to 157.5% of control. These results suggest that the changes in the concentration of nucleotides and their metabolic derivatives are useful indices of the extents of tissue ischemia in rat kidney.

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