51
|
Jung SY, Jeon HK, Choi JS, Kim YJ. Reduced expression of FASN through SREBP-1 down-regulation is responsible for hypoxic cell death in HepG2 cells. J Cell Biochem 2013; 113:3730-9. [PMID: 22786746 DOI: 10.1002/jcb.24247] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cells under hypoxic stress either activate an adaptive response or undergo cell death. Although some mechanisms have been reported, the exact mechanism behind hypoxic cell death remains unclear. Recently, increased expression of fatty acid synthase (FASN) has been observed in various human cancers. In highly proliferating cells, tumor-associated FASN is considered necessary for both membrane lipids production and post-translational protein modification, but the exact mechanisms are not fully understood. Further, FASN overexpression is associated with aggressive and malignant cancer diseases and FASN inhibition induces apoptosis in cancer cells. For this reason, FASN is emerging as a key target for the potential diagnosis and treatment of various cancers. Here, we observed decreased FASN expression under hypoxic cell death conditions in HepG2 cells. Thus, we examined the effect of decreased FASN expression on hypoxia-induced cell death in HepG2 cells and also investigated the mechanism responsible for reduction of FASN expression under hypoxic cell death conditions. As a result, reduction of FASN expression resulted in hypoxic cell death via malonyl-CoA accumulation. In addition, SREBP-1 restored FASN reduction and hypoxia-induced apoptosis. Taken together, we suggest that hypoxic cell death is promoted by the reduced expression of FASN through SREBP-1 down-regulation.
Collapse
|
52
|
Yun YH, Lee MK, Park SM, Kim YA, Lee WJ, Lee KS, Choi JS, Jung KH, Do YR, Kim SY, Heo DS, Kim HT, Park SR. Effect of complementary and alternative medicine on the survival and health-related quality of life among terminally ill cancer patients: a prospective cohort study. Ann Oncol 2013; 24:489-494. [PMID: 23110809 DOI: 10.1093/annonc/mds469] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023] Open
Abstract
BACKGROUND We evaluated whether complementary and alternative medicine (CAM) use influenced outcomes [survival and health-related quality of life (HRQOL)] of cancer patients whose condition had just been judged terminal. PATIENTS AND METHODS From July 2005 to October 2006, we conducted a prospective cohort study of 481 terminally ill cancer patients at 11 university hospitals and the National Cancer Center in Korea. We assessed how the use of CAM affected HRQOL and survival. RESULTS In a follow-up of 481 patients and 163.8 person-years, we identified 466 deceased cases. On multivariate analyses, CAM users did not have better survival compared with nonusers [adjusted hazard ratio (aHR), 0.91; 95% confidence interval (CI) 0.74-1.10]. Among mind-body interventions, prayer showed significantly worse survival (aHR, 1.56; 95% CI, 1.00-2.43). Clinically, CAM users reported significantly worse cognitive functioning (-11.6 versus -1.3; P < 0.05) and fatigue (9.9 versus -1.0; P < 0.05) than nonusers. Compared with nonusers in subgroup analysis, users of alternative medical treatments, prayer, vitamin supplements, mushrooms, or rice and cereal reported clinically significant worse changes in some HRQOL subscales. CONCLUSION While CAM did not provide any definite survival benefit, CAM users reported clinically significant worse HRQOLs.
Collapse
|
53
|
Jung US, Choi JS, Ko JH, Lee JH, Park SY, Park SH. Decreased prevalence of high-risk human papillomavirus infection is associated with obesity. EUR J GYNAECOL ONCOL 2013; 34:70-74. [PMID: 23590005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
PURPOSE OF INVESTIGATION Obesity is correlated with low education, low economic status, and lower rates of Pap smears, which are known as socio-demographic risk factors for cervical cancer. However, the association between obesity and high-risk human papillomavirus (HR-HPV) infection, the necessary cause of cervical cancer, and its related precursors, is not established. MATERIALS AND METHODS The authors examined the association between obesity and HR-HPV infection in 6,868 patients, who participated in annual health examinations at the Kangbuk Samsung Hospital in Seoul, Korea, from January through December 2007. RESULTS The prevalence of HR-HPV infection was 14.8%. Women infected with HR-HPV had a lower body mass index (BMI), when compared with non-infected women. After adjustment for alcohol intake, cigarette smoking, and marital status, HR-HPV infection was found to be negatively associated with BMI. When the analysis was stratified according to BMI, the risk of HR-HPV infection was significantly lower among those who were overweight (OR = 0.817, 95% CI = 0.680-0.982), or obese (OR = 0.688, 95% CI = 0.556-0.851), when compared with women with normal weight. CONCLUSION HR-HPV infection was associated with obesity defined by BMI, with a lower prevalence of infection observed in obese women.
Collapse
|
54
|
Lee HJ, Jung JH, Kang SS, Choi JS. A rubrofusarin gentiobioside isomer from roastedCassia tora. Arch Pharm Res 2012; 20:513-5. [PMID: 18982501 DOI: 10.1007/bf02973951] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/1997] [Indexed: 11/25/2022]
Abstract
From the roasted seeds ofCassia tora L., a new naphthopyrone glycoside was isolated and characterized as 10-[(beta-D-glucopyranosyl-(1-->6)-O-beta-D-glucopyranosyl)oxyl-5-hydroxy-8-methoxy-2-methyl-4H-naphtho [1,2-b]pyran-4-one(isorubrofusarin gentiobioside). Along with isorubrofusarin gentiobioside, alaternin and adenosine were isolated and identified.
Collapse
|
55
|
Kim KJ, Choi JS, Kim KW, Jeong JW. The anti-angiogenic activities of glycyrrhizic acid in tumor progression. Phytother Res 2012; 27:841-6. [PMID: 22899320 DOI: 10.1002/ptr.4800] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 07/03/2012] [Accepted: 07/16/2012] [Indexed: 12/24/2022]
Abstract
Glycyrrhizic acid (GA) is the bioactive compound of licorice and has been used as a herbal medicine because of its anti-viral, anti-cancer, and anti-inflammatory properties. This study was designed to investigate the effects of GA on tumor growth, angiogenesis, and the mechanisms underlying the anti-angiogenic activities of GA. We observed that GA inhibited tumor growth and angiogenesis in mice. GA decreased angiogenic activities, such as the migration, invasion, and tube formation of endothelial cells. We also demonstrated that GA reduced the production of reactive oxygen species and activation of ERK in endothelial cells. Our findings suggest that GA is a promising anti-angiogenic therapeutic agent that targets the ERK pathway. Considering that angiogenesis is highly stimulated in the majority of cancers, GA could offer a potent therapeutic agent for cancer.
Collapse
|
56
|
Joo DJ, Ju MK, Huh KH, Kim MS, Choi GH, Choi JS, Jeon KO, Kim SI. Does lymphocyte cross-matching predict acute rejection and graft survival in liver transplantation? Transplant Proc 2012; 44:418-20. [PMID: 22410032 DOI: 10.1016/j.transproceed.2012.01.071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The role of lymphocyte cross-matches (LCM) remains controversial in the liver transplant field. The aim of this study was to correlate the risk for acute rejection episodes and graft survival in liver transplantation with pretransplant LCM results. PATIENTS AND METHODS We enrolled 184 adult liver transplantation patients, excluding pediatric and second grafts. The 129 living donor and 55 deceased donor liver transplantations were divided into 2 groups: LCM (+); (n=20) and LCM (-); (n=164). RESULTS There were no differences in the demographic features, such as gender and recipient age, original disease, Model for End-Stage Liver Disease score, donor type, number of human leukocyte antigen mismatches, and cold ischemia times. There were no hyperacute rejection episodes in the LCM (+) group. Also, posttransplant complications such as acute rejection episode, biliary complication, or hepatic artery thrombosis were not different. Acute rejection episodes occurred in 5.0% of the LCM (+) group and 15.2% of the LCM (-) group (P=.317). Bile duct complications after transplantation arose in 20.0% of the LCM (+) group and in 32.9% of the LCM (-) group (P=.312). The 2 groups showed no difference in graft survival rate analyzed by the Kaplan-Meier method according to LCM results. CONCLUSION Pretransplant LCM results were not associated with overall graft survival or acute rejection episodes in this study.
Collapse
|
57
|
Choi JS, Park SY, Yi EY, Kim YJ, Jeong JW. Coenzyme Q10 decreases basic fibroblast growth factor (bFGF)-induced angiogenesis by blocking ERK activation. Oncol Res 2012; 19:455-61. [PMID: 22715588 DOI: 10.3727/096504012x13285365944256] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Coenzyme Q10 (CoQ10) is an essential factor of the mitochondrial respiratory chain and has effective antioxidant properties. Therefore, CoQ10 has been used in a variety of clinical applications and used as a nutritional supplement to treat several human diseases. Here, we tested the effects of CoQ10 on angiogenesis stimulated by basic fibroblast growth factor (bFGF). CoQ10 significantly inhibited bFGF-induced angiogenesis in a mouse Matrigel plug and the sprouting of endothelial cells in rat aortic rings. In addition, CoQ10 decreased the ability of tube formation, migration, and invasion in endothelial cells. When CoQ10 was used to inhibit angiogenesis in endothelial cells, the expression of vascular endothelial growth factor (VEGF) and the phosphorylation of ERK were decreased. Taken together, these results indicate that CoQ10 is able to act as an antiangiogenic regulator, and its inhibitory activity is mediated by blocking an ERK-dependent pathway. This study suggests that CoQ10 may be used a therapeutic agent to decrease neovascularization in several diseases, including solid tumors.
Collapse
|
58
|
Kong CS, Jeong CH, Choi JS, Kim KJ, Jeong JW. Antiangiogenic Effects of P
-Coumaric Acid in Human Endothelial Cells. Phytother Res 2012; 27:317-23. [DOI: 10.1002/ptr.4718] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 03/29/2012] [Accepted: 04/13/2012] [Indexed: 11/08/2022]
|
59
|
Lee W, Woo ER, Choi JS. Effects of myricetin on the bioavailability of carvedilol in rats. PHARMACEUTICAL BIOLOGY 2012; 50:516-522. [PMID: 22132944 DOI: 10.3109/13880209.2011.611141] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
CONTEXT As an inhibitor of CYP2C9, CYP2D6 and P-gp, myricetin might affect the bioavailability of carvedilol when myricetin and carvedilol are used concomitantly for the prevention or therapy of cardiovascular diseases as a combination therapy. However, the effect of myricetin on the pharmacokinetics of carvedilol has not been reported in vivo. OBJECTIVE This study investigated the effects of myricetin on the pharmacokinetics of carvedilol after oral or intravenous administration of carvedilol in rats. MATERIALS AND METHODS Carvedilol was administered orally or intravenously with or without oral administration of myricetin to rats. RESULTS The effects of myricetin on P-gp, CYP2C9 and 2D6 activity were evaluated. Myricetin inhibited CYP2C9 and CYP2D6 enzyme activity with IC50 of 13 and 57 μM, respectively. In addition, myricetin significantly enhanced the cellular accumulation of rhodamine-123 in MCF-7/ADR cells overexpressing P-gp. Compared with the control group, the AUC was significantly increased by 52.0-85.1%, and the C(max) was significantly increased by 93.1-133.4% in the presence of myricetin after oral administration of carvedilol. Consequently, the relative bioavailability of carvedilol was increased by 1.17- to 1.85-fold and the absolute bioavailability of carvedilol in the presence of myricetin was increased by 18.1-86.4%. T(max) was significantly decreased. DISCUSSION AND CONCLUSION The enhanced oral bioavailability of carvedilol may result from both inhibition of CYP2C9 or CYP2D6-mediated metabolism and P-gp-mediated efflux of carvedilol in small intestine and/or in liver by myricetin rather than reducing renal elimination. Concomitant use of myricetin or myricetin-containing dietary supplements with carvedilol will require close monitoring for potential drug interactions.
Collapse
MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/antagonists & inhibitors
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Administration, Oral
- Animals
- Antihypertensive Agents/administration & dosage
- Antihypertensive Agents/blood
- Antihypertensive Agents/pharmacokinetics
- Aryl Hydrocarbon Hydroxylases/antagonists & inhibitors
- Aryl Hydrocarbon Hydroxylases/metabolism
- Biological Availability
- Carbazoles/administration & dosage
- Carbazoles/blood
- Carbazoles/pharmacokinetics
- Carvedilol
- Cell Line, Tumor
- Cytochrome P-450 CYP2C9
- Cytochrome P-450 CYP2D6/metabolism
- Cytochrome P-450 CYP2D6 Inhibitors
- Drug Interactions
- Enzyme Inhibitors/administration & dosage
- Flavonoids/administration & dosage
- Fluorescent Dyes/metabolism
- Humans
- Injections, Intravenous
- Intestine, Small/drug effects
- Intestine, Small/enzymology
- Liver/drug effects
- Liver/enzymology
- Male
- Propanolamines/administration & dosage
- Propanolamines/blood
- Propanolamines/pharmacokinetics
- Rats
- Rats, Sprague-Dawley
- Rhodamine 123/metabolism
Collapse
|
60
|
Cho YA, Lee W, Choi JS. Effects of curcumin on the pharmacokinetics of tamoxifen and its active metabolite, 4-hydroxytamoxifen, in rats: possible role of CYP3A4 and P-glycoprotein inhibition by curcumin. DIE PHARMAZIE 2012; 67:124-130. [PMID: 22512082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The effects of curcumin, a natural anti-cancer compound, on the bioavailability and pharmacokinetics of tamoxifen and its metabolite, 4-hydroxytamoxifen, were investigated in rats. Tamoxifen and curcumin interact with cytochrom P450 (CYP) enzymes and P-glycoprotein, and the increase in the use of health supplements may result in curcumin being taken concomitantly with tamoxifen as a combination therapy to treat or prevent cancer. A single dose of tamoxifen was administered orally (9 mg x kg(-1)) with or without curcumin (0.5, 2.5 and 10 mg x kg(-1)) and intravenously (2mg x kg(-1)) with or without curcumin (2.5 and 10 mg x kg(-1)) to rats. The effects of curcumin on P-glycoprotein (P-gp) and CYP3A4 activity were also evaluated. Curcumin inhibited CYP3A4 activity with 50% inhibition concentration (IC50) values of 2.7 microM. In addition, curcumin significantly (P < 0.01 at 10 microM) enhanced the cellular accumulation of rhodamine-123 in MCF-7/ADR cells overexpressing P-gp in a concentration-dependent manner. This result suggested that curcumin significantly inhibited P-gp activity. Compared to the oral control group (given tamoxifen alone), the area under the plasma concentration-time curve (AUC(0-infinity)) and the peak plasma concentration (C(max)) of tamoxifen were significantly (P < 0.05 for 2.5 mg x kg(-1); P < 0.01 for 10 mg x kg(-1)) increased by 33.1-64.0% and 38.9-70.6%, respectively, by curcumin. Consequently, the absolute bioavailability of tamoxifen in the presence of curcumin (2.5 and 10 mg x kg(-1)) was 27.2-33.5%, which was significantly enhanced (P < 0.05 for 2.5 mg x kg(-1); P < 0.01 for 10 mg x kg(-1)) compared to that in the oral control group (20.4%). Moreover, the relative bioavailability of tamoxifen was 1.12- to 1.64-fold greater than that in the control group. Furthermore, concurrent use of curcumin significantly decreased (P < 0.05 for 10 mg x kg(-1)) the metabolite-parent AUC ratio (MR), implying that curcumin may inhibit the CYP-mediated metabolism of tamoxifen to its active metabolite, 4-hydroxytamoxifen. The enhanced bioavailability of tamoxifen by curcumin may be mainly due to inhibition of the CYP3A4-mediated metabolism of tamoxifen in the small intestine and/or in the liver and to inhibition of the P-gp efflux transporter in the small intestine rather than to reduction of renal elimination of tamoxifen, suggesting that curcumin may reduce the first-pass metabolism of tamoxifen in the small intestine and/or in the liver by inhibition of P-gp or CYP3A4 subfamily.
Collapse
MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/antagonists & inhibitors
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Administration, Oral
- Animals
- Antineoplastic Agents, Hormonal/blood
- Antineoplastic Agents, Hormonal/pharmacokinetics
- Area Under Curve
- Biological Availability
- Cell Line, Tumor
- Chromatography, High Pressure Liquid
- Curcumin/pharmacology
- Cytochrome P-450 CYP3A
- Cytochrome P-450 Enzyme Inhibitors
- Cytochrome P-450 Enzyme System/metabolism
- Erythromycin Ethylsuccinate
- Fluorescent Dyes
- Humans
- Indicators and Reagents
- Injections, Intravenous
- Male
- Rats
- Rats, Sprague-Dawley
- Rhodamine 123
- Tamoxifen/analogs & derivatives
- Tamoxifen/blood
- Tamoxifen/pharmacokinetics
Collapse
|
61
|
Choi JS, Kim MJ. Education and imaging: hepatobiliary and pancreatic: focal steatohepatitis mimicking a metastasis. J Gastroenterol Hepatol 2011; 26:415. [PMID: 21261737 DOI: 10.1111/j.1440-1746.2010.06614.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
62
|
Lee HJ, Han JY, Yook JH, Choi JS, Ahn HK, Kim MY, Song IO, Yang JH, Nava-Ocampo AA. A prospective cohort study of pregnancy outcomes of women inadvertently exposed to methylephedrine in the 1st trimester of pregnancy. J OBSTET GYNAECOL 2011; 30:563-6. [PMID: 20701502 DOI: 10.3109/01443615.2010.487577] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
No information is currently available on the safety of methylephedrine, a component of various cold medications available in South Korea. With previous approval by an Institutional Review Board, 349 women inadvertently exposed to methylephedrine during the 1st trimester of pregnancy and an age- and gravidity-matched control group, were enrolled in a prospective cohort study. Study outcomes, for example gestational age at birth, birth weight and major and minor malformations were evaluated in 282 cases and 280 controls. Exposure to methylephedrine was at a gestational age of 4.0 weeks (median), at doses ranging from 52.5 to 1,575 mg/day, for a median duration of 3 (range: 1-30) days. No differences were observed between cases and controls in any of the pregnancy outcomes studied. There were 4/265 (1.5%) babies born with major malformations in the case group and 4/260 (1.5%) in the control group. In conclusion, inadvertent exposure to methylephedrine as a component of over-the counter oral cold remedies in early pregnancy was not associated with an increased rate of adverse pregnancy outcomes. Co-exposure with acetaminophen, cigarette smoking or alcohol did not appear to modify the outcomes.
Collapse
|
63
|
Lee YS, Lee JH, Choi JS, Son CE, Jeon SW, Kim JT, Joo KJ, Cho YS, Jung US. Accessory polar renal artery encountered in transperitoneal systemic laparoscopic paraaortic lymphadenectomy. EUR J GYNAECOL ONCOL 2011; 32:87-90. [PMID: 21446334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To increase vigilance among gynecological surgeons for the presence of accessory polar renal artery (APRA) encountered with transperitoneal systemic laparoscopic paraaortic lymphadenectomy (LPAL). METHODS A retrospective review was conducted on 156 women who underwent LPAL for various gynecologic malignancies between November 2003 and December 2009. RESULTS The median age, parity, body mass index, and number of previous abdominal surgeries, respectively, of the women were 52 years (range, 23-82 years), two (range, 0-7), 24.1 kg/m2 (range, 17.4-35.0 kg/m2), and 0 (range, 0-3). During the study period, we found four women with APRA. There were three cases of right lower APRAs arising from the abdominal aorta, caudal to the inferior mesenteric artery (IMA), terminating at the parenchyma of the lower pole of the right kidney. In the other case, the APRA arose from the abdominal aorta superior to the IMA. There were no vascular complications, such as transection or ligation of the APRA. CONCLUSION It is important for the gynecological oncologic surgeon to have knowledge of retroperitoneal vascular anatomy, experience in laparoscopic surgery, and an accurate surgical technique to avoid vascular injury during LPAL.
Collapse
|
64
|
Kim JH, Park BL, Cheong HS, Pasaje CFA, Bae JS, Park JS, Jang AS, Uh ST, Choi JS, Kim YH, Kim MK, Choi IS, Cho SH, Choi BW, Koh IS, Park CS, Shin HD. Variations in the STK10 gene and possible associations with aspirin-intolerant asthma in a Korean population. J Investig Allergol Clin Immunol 2011; 21:378-388. [PMID: 21905501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
BACKGROUND AND OBJECTIVE Lymphocyte-oriented kinase deficiency encoded by the serine/threonine kinase 10 (STK10) gene correlates with the intracellular adhesion molecule 1 (ICAM-1)/lymphocyte function associated antigen 1 (LFA-1) complex in aspirin hypersensitivity. This study investigated the association between single nucleotide polymorphisms (SNPs) of STK10 and aspirin-intolerant asthma (AIA). METHODS A total of 54 SNPs were genotyped in 163 AIA patients and 429 aspirin-tolerant asthma (ATA) controls. RESULTS Logistic regression revealed that a synonymous variant (rs2306961G>A) had the most significant association with AIA (P = .008 under the codominant model; P = .004 under the dominant model), suggesting that tissue-specific codon usage between Lys_TTT and Lys_CTT could play a role in regulating expression of STK10 in airway epithelium. Haplotype analysis revealed that 4 haplotypes, including STK10_BL4-ht1, which is unique to rs2306961G>A, were significantly associated with aspirin hypersensitivity in asthmatics (P < .05). CONCLUSIONS Although replications in independent cohorts and further functional evaluations are needed, our preliminary findings suggest that STK10 polymorphisms might be susceptible genetic markers of AIA and that gene expression could be mediated by tissue-specific codon usage.
Collapse
|
65
|
Park JY, Kim YS, Shin DH, Choi JS, Kim KH, Bae YK. Primary cutaneous peripheral T-cell lymphoma in a patient with X-linked agammaglobulinaemia. Br J Dermatol 2010; 164:677-9. [PMID: 21083545 DOI: 10.1111/j.1365-2133.2010.10142.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
MESH Headings
- Adult
- Agammaglobulinemia/complications
- Antigens, CD/analysis
- Genetic Diseases, X-Linked/complications
- Humans
- Immunohistochemistry
- Lymphoma, T-Cell, Cutaneous/immunology
- Lymphoma, T-Cell, Cutaneous/pathology
- Lymphoma, T-Cell, Peripheral/immunology
- Lymphoma, T-Cell, Peripheral/pathology
- Male
Collapse
|
66
|
Choi JS, Kim MJ, Kim JH, Choi JY, Chung YE, Park MS, Kim KW. Comparison of multi-echo and single-echo gradient-recalled echo sequences for SPIO-enhanced liver MRI at 3 T. Clin Radiol 2010; 65:916-23. [PMID: 20933647 DOI: 10.1016/j.crad.2010.07.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 07/02/2010] [Accepted: 07/14/2010] [Indexed: 01/04/2023]
Abstract
AIM To assess the utility of a T2*-weighted, multi-echo data imaging combination sequenced on superparamagnetic iron oxide (SPIO)-enhanced liver magnetic resonance imaging (MRI) using a 3 T system. MATERIALS AND METHODS Fifty patients underwent SPIO-enhanced MRI at 3 T using T2*-weighted, single-echo, gradient-recalled echo (GRE) sequences [fast imaging with steady precession; repetition time (TR)/echo time (TE), 126 ms/9 ms; flip angle, 30°] and multi-echo GRE (multi-echo data image combination) sequences (TR/TE, 186 ms/9 ms; flip angle, 30°). Three radiologists independently reviewed the images in a random order. The sensitivity and accuracy for the detection of focal hepatic lesions (a total of 76 lesions in 33 patients; 48 solid lesions, 28 non-solid lesions) were compared by analysing the area under the receiver operating characteristic curves. Image artefacts (flow artefacts, susceptibility artefacts, dielectric artefacts, and motion artefacts), lesion conspicuity, and overall image quality were evaluated according to a four-point scale: 1, poor; 2, fair; 3, good; 4, excellent. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the lesions were compared. RESULTS Image artefacts were more frequent with single-echo GRE (p<0.05). The mean scale of image quality assessment for flow, susceptibility, dielectric, and motion artefacts were 2.76, 3.13, 3.42, and 2.89 with single-echo, respectively, compared with 3.47, 3.43, 3.47, and 3.39, respectively, with multi-echo GRE. There was no significant difference in lesion conspicuity between single-echo (3.15) and multi-echo (3.30) GRE sequences. The overall image quality was significantly (p<0.05) better with multi-echo (3.37) than with single-echo GRE (2.89). The mean SNR and CNR of the lesions were significantly (p<0.05) higher on multi-echo (79±23 and 128±59, respectively) images than on single-echo (38±11 and 102±44, respectively) images. Lesion detection accuracy and sensitivity were not significantly different between the two sequences. Mean accuracies and sensitivities were 0.864 and 0.785 for single-echo and 0.847 and 0.785 for multi-echo GRE, respectively. CONCLUSION At 3 T, the T2*-weighted, multi-echo data image combination sequence performs comparably to the T2*-weighted, single-echo GRE sequence for SPIO-enhanced MRI with good overall image quality and a decrease in undesired artefacts.
Collapse
|
67
|
Reinherz EL, Li J, Smoylar A, Wyss DF, Knoppers MH, Willis KJ, Arulanandam AR, Choi JS, Wagner G. Response: CD2: An Exception to the Immunologlobulin Superfamily Concept? Science 2010; 273:1242. [PMID: 17842602 DOI: 10.1126/science.273.5279.1242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
68
|
Li C, Lee MY, Choi JS. Effects of silybinin, CYP3A4 and P-glycoprotein inhibitor in vitro, on the bioavailability of loratadine in rats. DIE PHARMAZIE 2010; 65:510-514. [PMID: 20662320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The effect of silybinin on the pharmacokinetics of orally and intravenously administered loratadine in rats was investigated. Pharmacokinetic parameters of loratadine were determined in rats following oral (4 mg x kg(-1)) and intravenous (1 mg x kg(-1)) administration to rats in the presence and absence of silybinin (0.3, 1.5 and 6 mg x kg(-1)). Compared to those animals in an oral control group (given loratadine alone), the area under the plasma concentration-time curve (AUC) and the peak plasma concentration (C(max)) of loratadine were increased significantly (P < 0.05 for 1.5 mg x kg(-1), P < 0.01 for 6 mg x kg(-1)) by 50.0-76.7% and 65.4-90.1%, respectively, by silybinin. Consequently, the absolute bioavailability of loratadine in the presence of silybinin (1.5 and 6 mg x kg(-1)) was 8.6-10.2%, which was significantly (1.5 mg x kg(-1), P < 0.05; 6 mg x kg(-1), P < 0.01) enhanced compared to that in oral control group (5.8%). Moreover, the relative bioavailability of loratadine was 1.50- to 1.77-fold greater than that in the control group. In contrast, silybinin had no effect on any pharmacokinetic parameters of loratadine given intravenously, implying that coadministration of silybinin could inhibit the cytochrome P450 (CYP) 3A4-mediated metabolism of loratadine, resulting in reducing gastrointestinal and hepatic first-pass metabolism, and the P-glycoprotein (P-gp) efflux pump in the small intestine. Silybinin significantly enhanced the oral bioavailability of loratadine, suggesting that concurrent use of silybinin and loratadine should be monitored closely for potential drug interactions.
Collapse
|
69
|
Choi JS, Lee MS, Jeong JW. Ethyl pyruvate has a neuroprotective effect through activation of extracellular signal-regulated kinase in Parkinson’s disease model. Biochem Biophys Res Commun 2010; 394:854-8. [DOI: 10.1016/j.bbrc.2010.03.105] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Accepted: 03/17/2010] [Indexed: 01/08/2023]
|
70
|
Kim SY, Choi JS, Park C, Jeong JW. Ethyl pyruvate stabilizes hypoxia-inducible factor 1 alpha via stimulation of the TCA cycle. Cancer Lett 2010; 295:236-41. [PMID: 20338685 DOI: 10.1016/j.canlet.2010.03.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 03/03/2010] [Accepted: 03/04/2010] [Indexed: 10/19/2022]
Abstract
Ethyl pyruvate is a simple derivative of the endogenous metabolite pyruvate. Pyruvate is the starting substrate for the tricarboxylic acid (TCA) cycle and plays a central role in intermediary metabolism. The present study was to determine whether ethyl pyruvate affects the expression of hypoxia-inducible factor 1 alpha (HIF-1alpha) and to explore the mechanism of HIF-1alpha regulation. We found that ethyl pyruvate increased HIF-1alpha stability via inhibition of pVHL-mediated degradation. Furthermore, ethyl pyruvate enhanced the reactive oxygen species (ROS) generated through the TCA cycle in mitochondria. Taken together, our results support a novel role for ethyl pyruvate in HIF-1alpha stabilization by which high rates of the TCA cycle can promote ROS production.
Collapse
|
71
|
Estacion M, Choi JS, Eastman EM, Lin Z, Li Y, Tyrrell L, Yang Y, Dib-Hajj SD, Waxman SG. Can robots patch-clamp as well as humans? Characterization of a novel sodium channel mutation. J Physiol 2010; 588:1915-27. [PMID: 20123784 DOI: 10.1113/jphysiol.2009.186114] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Ion channel missense mutations cause disorders of excitability by changing channel biophysical properties. As an increasing number of new naturally occurring mutations have been identified, and the number of other mutations produced by molecular approaches such as in situ mutagenesis has increased, the need for functional analysis by patch-clamp has become rate limiting. Here we compare a patch-clamp robot using planar-chip technology with human patch-clamp in a functional assessment of a previously undescribed Nav1.7 sodium channel mutation, S211P, which causes erythromelalgia. This robotic patch-clamp device can increase throughput (the number of cells analysed per day) by 3- to 10-fold. Both modes of analysis show that the mutation hyperpolarizes activation voltage dependence (8 mV by manual profiling, 11 mV by robotic profiling), alters steady-state fast inactivation so that it requires an additional Boltzmann function for a second fraction of total current (approximately 20% manual, approximately 40% robotic), and enhances slow inactivation (hyperpolarizing shift--15 mV by human,--13 mV robotic). Manual patch-clamping demonstrated slower deactivation and enhanced (approximately 2-fold) ramp response for the mutant channel while robotic recording did not, possibly due to increased temperature and reduced signal-to-noise ratio on the robotic platform. If robotic profiling is used to screen ion channel mutations, we recommend that each measurement or protocol be validated by initial comparison to manual recording. With this caveat, we suggest that, if results are interpreted cautiously, robotic patch-clamp can be used with supervision and subsequent confirmation from human physiologists to facilitate the initial profiling of a variety of electrophysiological parameters of ion channel mutations.
Collapse
|
72
|
Han JY, Choi JS, Chun JM, Park HD, Lee SY, Kim CH, Park Q, Nava-Ocampo AA, Koren G. Pregnancy outcome of women transfused during pregnancy with blood products inadvertently obtained from donors treated with acitretin. J OBSTET GYNAECOL 2010; 29:694-7. [PMID: 19821659 DOI: 10.3109/01443610903177128] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We assessed the pregnancy outcome of nine women inadvertently transfused with acitretin-contaminated blood products in South Korea. A total of 18 women matched to cases by age, gravidity, and singleton- or twin-pregnancy, and who were transfused with blood products not contaminated with acitretin, was also recruited. There were nine babies born in the case group. No differences (p > 0.05) were observed between cases and controls in the gestational age at delivery (38.3 +/- 1.6 weeks vs 37.8 +/- 2.2 weeks), birth weight (3,146 +/- 874 g vs 3,106 +/- 568 g), rate of pre-term deliveries (22.2% vs 11.1%) and rate of low birth weight (<2,500 g) (33.3% vs 16.7%). There was no case of malformation or neurological abnormalities born in either group. In conclusion, inadvertent exposure to acitretin-contaminated blood products was not associated with adverse pregnancy outcomes, probably because of the removal of acitretin and etretinate during the manufacturing process of blood products.
Collapse
|
73
|
Choi JS, Hwang IR, Hong SH, Oh GT, Choi JA, Jeon SH, Kang SO, Yalishev VS, Park BH, Choi CH, Ahn CW, Nahm S, Ahn SJ. BaTiO3 doped Na0.5K0.5NbO3 thin films deposited by using eclipse shutter enhanced pulsed laser deposition method. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2009; 9:7354-7358. [PMID: 19908787 DOI: 10.1166/jnn.2009.1759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have investigated structural, electrical, and electro-mechanical properties of lead-free piezoelectric BaTiO3 doped Na0.5K0.5NbO3 (BTO-NKN) thin films deposited by pulsed laser deposition (PLD) methods. BTO-NKN thin films have been deposited on La0.5Sr0.5CoO3 (LSCO) bottom electrodes with LaAlO3 (LAO) substrates. X-ray diffraction data have shown that all the BTO-NKN and bottom electrodes are highly oriented with their c-axes normal to the substrates. In order to improve the morphology of BTO-NKN thin films, we have located an eclipse shutter between a target and a substrate. Root-mean-square roughness was changed from 91 nm to 21 nm with eclipse shutter enhanced PLD (E-PLD) method. Furthermore, the enhanced surface morphology leads to the improvement in electrical or electro-mechanical properties mainly due to increased density. Typical capacitance and d33 values of a BTO-NKN film deposited by E-PLD method are 1000 pF and 30 pmN, respectively.
Collapse
|
74
|
Shin SC, Li C, Choi JS. Effects of baicalein, an antioxidant, on the bioavailability of doxorubicin in rats: possible role of P-glycoprotein inhibition by baicalein. DIE PHARMAZIE 2009; 64:579-583. [PMID: 19827298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The purpose of this thesis is to investigate the effects of baicalein, an antioxidant, on the bioavailability and pharmacokinetics of Doxorubicin (DOX) in rats. Thus, DOX was administered intravenously (i.v.; 10 mg x kg(-1)) or orally (p.o.; 50 mg x kg(-1)) with or without oral baicalein (0.3, 1.5 and 6 mg x kg(-1)). In the presence of 1.5 and 6 mg x kg(-1) of baicalein, the total area under the plasma concentration-time curve from time zero to time infinity (AUC) and the peak concentration (Cmax) of DOX were significantly greater and higher, respectively, than those of the control. Consequently, the absolute bioavailability (AB) of DOX in the presence of baicalein was 3.5-4.4%, which was significantly enhanced compared with that of the control group (2.2%). The relative bioavailability (RB) of DOX was 1.20 to 1.96 times higher than that of the control group. Compared to the intravenous control, the presence of oral baicalein increased the i.v. AUC of DOX and other pharmacokinetic parameters were not significantly affected. The enhanced bioavailability of oral DOX by oral baicalein may be due to the inhibition of both P-glycoprotein (P-gp) and the cytochrome P450 (CYP) 3A subfamily by baicalein in the intestine and/or liver. This result suggests that the development of oral DOX is feasible by combination with baicalein that would be more convenient than the i.v. dosage forms. Furthermore, since the present study raises the awareness about potential drug interactions by concomitant use of DOX with baicalein, the dosage regimen of DOX should be taken into consideration, if this result is confirmed in clinical studies.
Collapse
|
75
|
Han JY, Yang JH, Chung JH, Choi JS, Ahn HK, Ryu HM, Kim MY, Cho SI, Nava-Ocampo AA. Teratogen risk counselling by internet: A prospective cohort study. J OBSTET GYNAECOL 2009; 25:427-31. [PMID: 16183573 DOI: 10.1080/01443610500160584] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Although the internet may play a role in providing proper teratogen-risk counselling for pregnant women, the experience with this type of service has not been reported. We aimed to compare the pregnancy outcome of women counselled by the internet to women that received typically in-clinic teratogen risk counselling in the clinic. In a prospective cohort design, 1,011 patients were counselled in the clinic and 235 patients were counselled via the internet. Teratogen risk counselling was provided according with the information obtained from medical literature and specialised software. Information about pregnancy outcome (delivery, spontaneous abortion, or termination of pregnancy and major malformations) was obtained from 903 (89.3%) patients from the clinic group and 141 (60%) from the internet group. The amount of alcohol, cigarettes smoked, and millirads of X-ray were greater ( p < 0.05) in patients counselled by internet than in clinic. The rate of deliveries, ongoing pregnancies, pregnancy terminations, and spontaneous abortions were similar between clinic and internet (chi2 = 1.32; p = 0.7). Of 498 babies born to mothers counselled in the clinic, major malformations were identified in 3.6%. Of 67 babies born to mothers counselled by internet, major malformations were present in 1.5% ( p = 0.6). Teratogen-risk counselling by internet and clinic seems to have a similar efficacy in pregnancy outcome.
Collapse
|