151
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Jung M, Lee S, Park HY, Youm JK, Jeong S, Bae J, Kwon MJ, Park BD, Lee SH, Choi EH. Anti-ageing effects of a new synthetic sphingolipid (K6EAA-L12) on aged murine skin. Exp Dermatol 2011; 20:314-9. [DOI: 10.1111/j.1600-0625.2010.01185.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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152
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Kwon MJ, Nam ES, Cho SJ, Shin HS, Kwon JH, Rho YS. Osteoclast-like Giant Cell Tumor of the Parotid Gland Accompanied with Carcinoma ex Pleomorphic Adenoma. KOREAN JOURNAL OF PATHOLOGY 2011. [DOI: 10.4132/koreanjpathol.2011.45.s1.s84] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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153
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Kwon MJ, Nam ES, Cho SJ, Shin HS, Kim JS, Kim DJ. A Case of Paraduodenal Pancreatitis and Immunohistochemical Analysis. KOREAN JOURNAL OF PATHOLOGY 2010. [DOI: 10.4132/koreanjpathol.2010.44.2.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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154
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Choi L, Kwak MY, Kwak EH, Kim DH, Han EY, Roh T, Bae JY, Ahn IY, Jung JY, Kwon MJ, Jang DE, Lim SK, Kwack SJ, Han SY, Kang TS, Kim SH, Kim HS, Lee BM. Comparative nephrotoxicitiy induced by melamine, cyanuric acid, or a mixture of both chemicals in either Sprague-Dawley rats or renal cell lines. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2010; 73:1407-1419. [PMID: 20954068 DOI: 10.1080/15287394.2010.511540] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Acute nephrotoxicities of melamine (MEL), cyanuric acid (CA), and a mixture of both melamine and cyanuric acid (MC) were comparatively investigated in male Sprague-Dawley rats at 5 doses each with 10-fold dose interval as follows: MEL at 0.0315, 0.315, 3.15, 31.5, and 315 mg/kg; CA at 0.025, 0.25, 2.5, 25, and 250 mg/kg, and MC: [1×: (0.0315 + 0.025), 10×: (0.315 + 0.25), 100×: (3.15 + 2.5), 1000×: (31.5 + 25), and (315 + 250) mg/kg]. No marked adverse effects in renal function were observed in animals treated with MEL alone or CA alone, but evidence related to nephrotoxicity was noted in rats administered MC. Renal calculi and increased kidney weights were found in rats 7 d after daily oral administration of MC. Blood urea nitrogen (BUN) and creatinine were significantly elevated in the high dose MC groups at 100× or 1000×. In addition, elevated numbers of white blood cells (WBC), neutrophils, and lymphocytes in vivo and increased levels of prostaglandin E(2) (PGE(2)) in vitro were found in the MC group. Based on these data, the NOAEL (no-observed-adverse-effect level) for nephrotoxicity for MC was estimated to be 3.15 mg/kg body weight (bw)/d (MEL) plus 2.5 mg/kg bw/d (CA). If a safety factor of 1000 or more were applied to NOAEL, tolerable daily intake (TDI) would be 0.00315 and 0.0025 mg/kg/d or less for MEL and CA, respectively, which is far below the TDI of 0.2 mg/kg/d set by World Health Organization (WHO). In addition, in vitro cytotoxicity assays showed that the ACHN human renal adenocarcinoma cell line was more sensitive to MEL, CA, and MC than the MDCK canine kidney epithelial cell line. The 24-h half maximal inhibitory concentration (IC(50)) values for MEL (4792, 2792 μg/ml) were less than those of CA (9890, 6725 μg/ml, respectively) in MDCK and ACHN cell lines, suggesting that MEL may be more cytotoxic than CA. Furthermore, the 24-h IC(50) value for MC was found to be 208 μg/ml in ACHN cells. Data suggest that NOAELs based upon acute nephrotoxic parameters for MC were low, which might require further reassessment of the current TDI.
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155
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Kwon MJ, Nam ES, Cho SJ, Park HR, Shin HS, Park JH, Park CH, Lee WJ. Comparison of tissue microarray and full section in immunohistochemistry of gastrointestinal stromal tumors. Pathol Int 2009; 59:851-6. [DOI: 10.1111/j.1440-1827.2009.02465.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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156
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Kwon MJ, Nam ES, Cho SJ, Park HR, Shin HS, Park JH, Park CH, Lee WJ. E2F1 expression predicts outcome in Korean women who undergo surgery for breast carcinoma. Ann Surg Oncol 2009; 17:564-71. [PMID: 19841979 DOI: 10.1245/s10434-009-0767-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2009] [Indexed: 11/18/2022]
Abstract
BACKGROUND The transcriptional factors E2F1 and E2F2 have been reported to be associated with improved chemosensitivity in various cancers. We aimed to investigate whether E2F1 and E2F2 can be used as predictors of chemosensitivity in hormone-receptor-negative breast cancers (HRNBCs), which are common in Korean women. METHODS A total of 183 patients with primary breast cancer who had undergone surgical resection were evaluated on the basis of hormonal status, age, histological subtype and grade, tumor size, lymph node metastasis, and stage. The immunohistochemical expressions of E2F1 and E2F2 were analyzed for these histopathological data and patient survival. RESULTS E2F1 expression was associated with low histological grade (grade 1) and larger tumor size (>2 cm), while E2F2 expression was correlated only with large tumor size (>2 cm). The E2F1-positive group had less tumor recurrences, lymph node metastases during follow-up, and distant metastases than the E2F1-negative group; E2F1 expression was found to be an independent predictive factor of more favorable survival among HRNBC patients on univariate and multivariate analyses, but E2F2 expression was not. CONCLUSIONS E2F1 may be a potential prognostic and predictive factor for clinical outcome and therapeutic results following adjuvant chemotherapy in HRNBC patients.
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157
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Kwon MJ, Nam ES, Cho SJ, Shin HS, Na YS, Chang JH, Kim IS. Bowel loop in an ovarian tumor: Grossly visible, completely developed intestinal loop in mature cystic teratoma of malignant mixed germ cell tumor. Pathol Int 2009; 59:479-81. [DOI: 10.1111/j.1440-1827.2009.02396.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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158
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Kwon MJ, Nam ES, Cho SJ, Park HR, Shin HS, Lee JS, Park CH, Shin WG. The Expressions of E2F1 and p53 in Gastrointestinal Stromal Tumors and Their Prognostic Significance. KOREAN JOURNAL OF PATHOLOGY 2009. [DOI: 10.4132/koreanjpathol.2009.43.3.212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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159
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Park CM, Shin WG, Hong KW, Park JW, Jung JC, Kwon MJ, Yoon DY, Nam ES, Kim HY. Arteriovenous malformation causing ileocecal variceal bleeding in liver cirrhosis: case report and review of the literature. Gut Liver 2008; 2:54-9. [PMID: 20485612 DOI: 10.5009/gnl.2008.2.1.54] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2008] [Accepted: 04/21/2008] [Indexed: 12/22/2022] Open
Abstract
Varices that occur at sites other than the esophagogastric area are termed ectopic varices. An ileal varix is a very rare cause of lower gastrointestinal bleeding. Although ileal varices are generally associated with prior intra-abdominal surgery and adhesions, an arteriovenous malformation (AVM) in the ileocecal area can cause ileal varices and bleeding in patients with portal hypertension who have not received previous intra-abdominal surgery, which is due to an intestinal or colonic AVM dilating the collateral veins and further aggravating portal hypertension. Surgical treatment should be considered in patients with massive ectopic variceal bleeding. We report a case of massive ileocecal variceal bleeding associated with an AVM that occurred in a patient with alcoholic liver cirrhosis.
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160
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Park HY, Youm JK, Kwon MJ, Park BD, Lee SH, Choi EH. K6PC-5, a novel sphingosine kinase activator, improves long-term ultraviolet light-exposed aged murine skin. Exp Dermatol 2008; 17:829-36. [PMID: 18341573 DOI: 10.1111/j.1600-0625.2008.00708.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sphingosine-1-phosphate (S1P), which is formed by phosphorylation of sphingosine through a process catalysed by sphingosine kinase (SK), is a multifunctional mediator of a variety of cellular responses including proliferation, differentiation, motility, and survival. K6PC-5, which was recently synthesized as a novel SK activator, is expected to increase S1P levels. Indeed studies have already demonstrated that K6PC-5 exhibits anti-aging effects on intrinsic aged murine skin by increasing fibroblasts, collagen synthesis, dermal thickness, and epidermal differentiation. However, photoaging and intrinsic aging have highly different clinical and histopathological properties. In this study, we developed a photoaged murine model by exposing mice that were 56 weeks old to ultraviolet (UV)B and UVA radiation for 8 weeks. We then investigated whether K6PC-5, as an SK activator, had anti-aging effects on photoaged murine skin in addition to its effects on intrinsic aged murine skin and determined the mechanism. K6PC-5 increased dermal collagen density in photoaged skin through increases in fibroblasts and collagen production. Photoaged murine skin treated with K6PC-5 showed an increase in stratum corneum (SC) integrity with increased corneodesmosome density and an improvement in barrier recovery rate. Matrix metalloproteinase 13 remained unchanged. These results indicate that topical application of K6PC-5 improves photoaged skin by improving skin barrier and increasing fibroblast count and function. In conclusion, K6PC-5, as an S1P activator, improves long-term UV-exposed aged skin as well as intrinsic aged skin.
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161
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Choi YL, Kim J, Kwon MJ, Choi JS, Kim TJ, Bae DS, Koh SS, In YH, Park YW, Kim SH, Ahn G, Shin YK. Expression profile of tight junction protein claudin 3 and claudin 4 in ovarian serous adenocarcinoma with prognostic correlation. Histol Histopathol 2007; 22:1185-95. [PMID: 17647191 DOI: 10.14670/hh-22.1185] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tight junction proteins claudin 3 (CLDN3) and claudin 4 (CLDN4) are frequently altered in several human cancers, including ovarian carcinomas. Here, we examined the gene expression of CLDN3 and CLDN4 in various tumors, including 19 normal ovaries and 47 ovarian carcinomas by analyzing Affymetrix HG-U133 array data. Furthermore, a total of 114 ovarian serous tumors, including 10 adenomas, 20 borderline tumors and 84 carcinomas, were analyzed immunohistochemically to confirm the expression of two proteins and we assessed the association of their expression with the clinicopathological characteristics and survival of the patients. The microarray experiment revealed CLDN3 and CLDN4 transcripts were significantly up-regulated by 5-fold or more in most subtypes of ovarian epithelial carcinomas while the immunohistochemical analyses indicated that each protein was expressed in 68 (81.0%) and 72 (85.7%) of 84 serous adenocarcinomas, respectively. Borderline serous tumors and adenomas showed significantly lower expression of these proteins than the adenocarcinomas. Kaplan-Meier survival analysis showed that serous adenocarcinoma patients with high CLDN3 expression had substantially shorter survival (P=0.027). Multivariate analysis demonstrated that CLDN3 overexpression is an independent negative prognostic factor. Our findings suggest that CLDN3 overexpression can be used as a prognostic indicator in ovarian serous carcinomas. Moreover, CLDN3 may be a promising target for antibody-based therapy of ovarian carcinomas.
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MESH Headings
- Biomarkers, Tumor/metabolism
- Claudin-3
- Claudin-4
- Cystadenocarcinoma, Serous/genetics
- Cystadenocarcinoma, Serous/metabolism
- Cystadenocarcinoma, Serous/mortality
- Cystadenocarcinoma, Serous/pathology
- Cystadenoma, Serous/genetics
- Cystadenoma, Serous/metabolism
- Cystadenoma, Serous/mortality
- Cystadenoma, Serous/pathology
- Female
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Humans
- Male
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Ovarian Neoplasms/genetics
- Ovarian Neoplasms/metabolism
- Ovarian Neoplasms/mortality
- Ovarian Neoplasms/pathology
- Ovary/metabolism
- Ovary/pathology
- Prognosis
- RNA, Messenger/metabolism
- Retrospective Studies
- Survival Rate
- Tissue Array Analysis
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162
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Jeong DH, Jeong JC, Park CH, Kwon MJ, Cho SJ, Nam ES, Shin HS, Kim KS. Microsatellite Instability in Invasive Ductal Carcinomas. J Breast Cancer 2007. [DOI: 10.4048/jbc.2007.10.1.77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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163
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Shin JS, Wang MH, Hwang SW, Cho H, Cho SY, Kwon MJ, Lee SY, Oh U. Differences in sensitivity of vanilloid receptor 1 transfected to human embryonic kidney cells and capsaicin-activated channels in cultured rat dorsal root ganglion neurons to capsaicin receptor agonists. Neurosci Lett 2001; 299:135-9. [PMID: 11166956 DOI: 10.1016/s0304-3940(00)01777-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Heterologously expressed vanilloid receptor 1 (VR1), a cloned cDNA encoding for capsaicin (CAP)-sensitive currents, resembles the native CAP channels in cultured sensory neurons in channel property. But, the pharmacological profile of VR1 to various CAP analogs is not known. The stable expression of VR1 in human embryonic kidney (HEK) cells was generated and confirmed by reverse transcription-polymerase chain reaction and Western blots. VR1 expressed in HEK cells retained single-channel properties similar to those of the native channels. When concentration-response relationships were compared, CAP and DA-5018.HCl, a synthetic analog of CAP, exhibited a greater potency in activating VR1 than the native channels in sensory neurons. In contrast, resiniferatoxin and its analog, phorbol 12-phenylacetate 13-acetate 20-homovanillate, was more potent in activating the CAP-activated channels in cultured sensory neurons than VR1. Thus, the difference in pharmacological profiles of VR1 and the native channels suggests the possible presence of subtypes of the CAP receptor or regulatory mechanisms associated with VR1.
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MESH Headings
- Analgesics, Non-Narcotic/pharmacology
- Animals
- Animals, Newborn
- Capsaicin/analogs & derivatives
- Capsaicin/pharmacology
- Cells, Cultured/cytology
- Cells, Cultured/drug effects
- Cells, Cultured/metabolism
- Diterpenes/pharmacology
- Dose-Response Relationship, Drug
- Ganglia, Spinal/cytology
- Ganglia, Spinal/drug effects
- Ganglia, Spinal/metabolism
- Gene Expression Regulation/physiology
- Humans
- Ion Channels/drug effects
- Ion Channels/metabolism
- Kidney/cytology
- Kidney/drug effects
- Kidney/metabolism
- Neurons, Afferent/cytology
- Neurons, Afferent/drug effects
- Neurons, Afferent/metabolism
- Phorbol Esters/pharmacology
- Rats
- Receptors, Drug/drug effects
- Receptors, Drug/genetics
- Receptors, Drug/metabolism
- TRPV Cation Channels
- Transfection
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164
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Kim PK, Kwon MJ. Renal transplantation in Korean children. Transplant Proc 1996; 28:1172-3. [PMID: 8658615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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165
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Hiramatsu M, Kabuto H, Kwon MJ, Ishii A, Mori A. Depressed convulsions by diazepam and its effects on brain monoamines and amino acids in E1 mice. Epilepsy Res 1988; 2:182-6. [PMID: 3197691 DOI: 10.1016/0920-1211(88)90055-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effect of diazepam on inbred mutant E1 mice, which develop convulsive seizures after repeated sessions of being tossed up, was examined. Acute administration of diazepam (32 mg/kg, i.p.) completely inhibited the convulsions. At that time, the dopamine level was increased in the cortex and hippocampus, and the norepinephrine level in the cerebellum was decreased. 5-Hydroxytryptamine levels were not changed. As for amino acids, the glutamine level increased and the levels of GABA, glutamic acid, aspartic acid, alanine and other amino acids were not changed.
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