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Ha M, Son YR, Kim J, Park SM, Hong CM, Choi D, Kang W, Kim JH, Lee KJ, Park D, Han ME, Oh SO, Lee D, Kim YH. TEK is a novel prognostic marker for clear cell renal cell carcinoma. Eur Rev Med Pharmacol Sci 2020; 23:1451-1458. [PMID: 30840266 DOI: 10.26355/eurrev_201902_17102] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Clear cell renal cell carcinoma (ccRCC) is the most common type of kidney cancer. However, effective therapeutics for ccRCC are lacking. Novel biomarkers could provide critical information when determining prognoses for patients with ccRCC. In this study, we sought to determine if the expression of receptor tyrosine kinase (TEK) could be a potential novel prognostic biomarker for ccRCC. TEK, originally identified as an endothelial cell-specific receptor, plays an important role in the modulation of vasculogenesis and remodeling. Altered TEK expression has been observed in tumor tissues (e.g., oral squamous cell carcinomas, leukemia) and breast, gastric and thyroid cancers. However, the role of TEK in ccRCC remains unknown. PATIENTS AND METHODS Differential TEK expression between non-metastatic (stage M0) and metastatic (stage M1) ccRCC patient cohorts was determined from The Cancer Genome Atlas (TCGA) and the International Cancer Genome Consortium (ICGC). Furthermore, TEK expression was assessed as a prognostic factor using the time-dependent area under the curve (AUC) of Uno's C-index, the AUC value of the receiver operating characteristics (ROC) at 5 years, Kaplan-Meier survival curves and multivariate analyses. RESULTS A Kaplan-Meier curve analysis revealed that the downregulation of TEK expression was associated with a poor prognosis for patients with ccRCC with good discrimination (p<0.0001 and p=0.0044 for the TGCA and ICGC cohorts, respectively). Analyses of C-indices and receiver operating characteristic AUC values further support this discriminative ability. Moreover, multivariate analyses showed the prognostic significance of TEK expression levels (p<0.001). CONCLUSIONS Although additional clinical investigations will be needed, our results suggest that TEK is a potential biomarker for ccRCC.
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Affiliation(s)
- M Ha
- Department of Anatomy, Pusan National University School of Medicine, Yangsan, Republic of Korea.
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Kim JS, Pak K, Goh TS, Jeong DC, Han ME, Kim J, Oh SO, Kim CD, Kim YH. Prognostic Value of MicroRNAs in Coronary Artery Diseases: A Meta-Analysis. Yonsei Med J 2018; 59:495-500. [PMID: 29749132 PMCID: PMC5949291 DOI: 10.3349/ymj.2018.59.4.495] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 03/12/2018] [Accepted: 03/14/2018] [Indexed: 12/12/2022] Open
Abstract
PURPOSE Coronary artery diseases (CADs) are the leading causes of death in the world. Recent studies have reported that differentially expressed microRNAs (miRNAs) are associated with prognosis or major adverse cardiac events (MACEs) in CAD patients. In a previous meta-analysis, the authors made serious mistakes that we aimed to correct through an updated systematic review and meta-analysis of the prognostic value of altered miRNAs in patients with CADs. MATERIALS AND METHODS We performed a systematic search of MEDLINE (from inception to May 2017) and EMBASE (from inception to May 2017) for English-language publications. Studies of CADs with results on miRNAs that reported survival data or MACEs were included. Data were extracted from each publication independently by two reviewers. RESULTS After reviewing 515 articles, a total eight studies were included in this study. We measured pooled hazard ratios (HRs) and 95% confidence intervals (CIs) of miRNA 133a with a fixed-effect model (pooled HR, 2.35; 95% CI, 1.56-3.55). High expression of miRNA 133a, 208b, 126, 197, 223, and 122-5p were associated with high mortality. Additionally, high levels of miRNA 208b, 499-5p, 134, 328, and 34a were related with MACEs. CONCLUSION The present study confirmed that miRNA 133a, which was associated with high mortality in CAD patients, holds prognostic value in CAD. More importantly, this study corrected issues raised against a prior meta-analysis and provides accurate information.
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Affiliation(s)
- Ji Suk Kim
- BEER, Busan Society of Evidence-based Mdicine and Research, Busan, Korea
- Department of Family Medicine, BHS Han Seo Hospital, Busan, Korea
| | - Kyoungjune Pak
- BEER, Busan Society of Evidence-based Mdicine and Research, Busan, Korea
- Department of Nuclear Medicine, Pusan National University Hospital, Busan, Korea
| | - Tae Sik Goh
- BEER, Busan Society of Evidence-based Mdicine and Research, Busan, Korea
- Department of Orthopaedic Surgery, Pusan National University Hospital, Busan, Korea
| | | | - Myoung Eun Han
- Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Korea
| | - Jihyun Kim
- Department of Family Medicine, BHS Han Seo Hospital, Busan, Korea
| | - Sae Ock Oh
- Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Korea
| | - Chi Dae Kim
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan, Korea
| | - Yun Hak Kim
- BEER, Busan Society of Evidence-based Mdicine and Research, Busan, Korea
- Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Korea.
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Kim YH, Goh TS, Lee CS, Oh SO, Kim JI, Jeung SH, Pak K. Prognostic value of microRNAs in osteosarcoma: A meta-analysis. Oncotarget 2018; 8:8726-8737. [PMID: 28060730 PMCID: PMC5352436 DOI: 10.18632/oncotarget.14429] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 12/01/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Osteosarcoma is the most common primary bone malignancy. We meta-analyzed the prognostic value of altered miRNAs in patients with osteosarcoma. METHODS Sources from MEDLINE (from inception to August 2016) and EMBASE (from inception to August 2016) were searched. Studies of osteosarcoma with results of miRNA and studies that reported survival data were included and two authors performed the data extraction independently. Any discrepancies were resolved by a consensus. The outcome was overall survival and event-free survival assessed using hazard ratios (HRs). RESULTS After reviewing the full text of 65 articles, 25 studies including 2,278 patients were eligible in this study. The pooled HR for deaths was 1.40 (95% confidence interval [CI] 1.01-1.94, p=0.04) with random-effects model (χ2=113.08, p<0.00001, I2=79%) for patients of osteosarcoma with lower expression of miRNA. However, the pooled HR for events was not significant (HR 0.97, 0.63-1.48, p=0.87, χ2=72.65, p<0.00001, I2=79%). In pathway analysis of miRNAs, miRNA449a, 199-5p, 542-5p have common target genes. CONCLUSIONS Expression level of miRNA in patients of osteosarcoma is important as a prognostic factor.
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Affiliation(s)
- Yun Hak Kim
- BEER, Busan Society of Evidence-Based Medicine and Research, Busan, Republic of Korea.,Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
| | - Tae Sik Goh
- BEER, Busan Society of Evidence-Based Medicine and Research, Busan, Republic of Korea.,Department of Orthopaedic Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Chi-Seung Lee
- Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea
| | - Sae Ock Oh
- Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
| | - Jeung Il Kim
- Department of Orthopaedic Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Seung Hyeon Jeung
- Department of Orthopaedic Surgery and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Kyoungjune Pak
- BEER, Busan Society of Evidence-Based Medicine and Research, Busan, Republic of Korea.,Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
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Kim YH, Bae JU, Kim IS, Chang CL, Oh SO, Kim CD. SIRT1 prevents pulmonary thrombus formation induced by arachidonic acid via downregulation of PAF receptor expression in platelets. Platelets 2016; 27:735-742. [DOI: 10.1080/09537104.2016.1190005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Yun Hak Kim
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
| | - Jin Ung Bae
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
| | - In Suk Kim
- Department of Laboratory Medicine, Pusan National University School of Medicine and Pusan National University Yangsan Hospital, Yangsan, Gyeongnam, Republic of Korea
| | - Chulhun L. Chang
- Department of Laboratory Medicine, Pusan National University School of Medicine and Pusan National University Yangsan Hospital, Yangsan, Gyeongnam, Republic of Korea
| | - Sae Ock Oh
- Department of Anatomy, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
| | - Chi Dae Kim
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan, Gyeongnam, Republic of Korea
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Lee SJ, Choi EK, Seo KW, Bae JU, Kim YH, Park SY, Oh SO, Kim CD. 5-Lipoxygenase plays a pivotal role in endothelial adhesion of monocytes via an increased expression of Mac-1. Cardiovasc Res 2013; 99:724-33. [DOI: 10.1093/cvr/cvt135] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Baek SY, Kim YH, Oh SO, Lee CR, Yoo CI, Lee JH, Lee H, Sim CS, Park J, Kim JW, Yoon CS, Kim Y. Manganese does not alter the severe neurotoxicity of MPTP. Hum Exp Toxicol 2007; 26:203-11. [PMID: 17439923 DOI: 10.1177/0960327107070567] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We utilized a mice model of Parkinsonism: (1) to evaluate 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced neurotoxicity; and (2) to evaluate whether manganese (Mn) exposure can affect MPTP-induced neurotoxicity. A 2 x 3 experimental design (MPTP x+/- Mn) was as follows: SS, MPTP(-) x Mn(-); SLMn, MPTP(-) x low Mn(+); SHMn, MPTP(-) x high Mn(+); MpS, MPTP(+) x Mn(-); MpLMn, MPTP(+) x low Mn(+); MpHMn, MPTP(+) x high Mn(+). We administered MPTP (30 mg/kg per day) to male C57BL/6 mice intraperitoneally, once a day for 5 days. Subsequently, mice were treated with either 2 or 8 mg/kg of MnCl(2).4H(2)O intraperitoneally, once a day for 3 weeks. Blood and striatal Mn levels were elevated in the Mnexposed groups. The number of tyrosine hydroxylase (TH)-immunoreactive (ir) neurons in the substantia nigra pars compacta were decreased significantly in the MPTP-exposed groups. The densities of TH-ir axon terminals in caudate-putamen (CPU) were significantly decreased in the MPTP-treated groups. However, Mn treatment did not affect MPTP neurotoxicity. The densities of glial fibrillary acidic protein (GFAP)-ir astrocytes in the CPU or globus pallidus were significantly increased in the MPTP-treated groups. Concentrations of dopamine in the striatum were decreased significantly in the MPTP-exposed groups only, but Mn had no effect.
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Affiliation(s)
- S Y Baek
- Department of Anatomy, Pusan National University Medical School, Busan, South Korea
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Bae MK, Kim SR, Wee HJ, Yoo MA, Oh SO, Baek SY, Kim BS, Kim JB, Sik-Yoon, Bae SK. Aspirin-induced blockade of NF-kB activity restrains up-regulation of glial fibrillary acidic protein in human astroglial cells. Vascul Pharmacol 2006. [DOI: 10.1016/j.vph.2006.08.368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Bae MK, Kim SR, Lee HJ, Wee HJ, Yoo MA, Ock Oh S, Baek SY, Kim BS, Kim JB, Bae SK. Aspirin-induced blockade of NF-kappaB activity restrains up-regulation of glial fibrillary acidic protein in human astroglial cells. Biochim Biophys Acta 2006; 1763:282-9. [PMID: 16516312 DOI: 10.1016/j.bbamcr.2006.01.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2005] [Revised: 01/12/2006] [Accepted: 01/12/2006] [Indexed: 01/04/2023]
Abstract
The marked induction of glial fibrillary acidic protein (GFAP) has been observed in astrocytes during neuropathological processes accompanying reactive gliosis; however, the precise molecular mechanism(s) underlying this GFAP induction remains poorly resolved. Therefore, in this study, we examined whether the change of nuclear factor-kappa B (NF-kappaB) activity can influence GFAP expression levels. Aspirin, widely used to prevent NF-kappaB activity, reduced the levels of GFAP mRNA and protein in human astroglial cells including human glioblastoma A172 cells and primary human brain astrocyte cells (HBAs). Furthermore, aspirin inhibited the effects of hypoxic injury on the up-regulation of GFAP expression in HBAs. We confirmed the repressive effect of aspirin on GFAP transcription by GFAP promoter-driven reporter assay and found that one NF-kappaB binding site conserved in the mouse and human GFAP gene promoters is critical for this effect. To further delineate whether NF-kappaB is directly involved in the regulation of GFAP gene expression, we transfected A172 cells with an expression vector encoding a super-repressor IkappaBalpha protein (IkappaBalpha-SR) to specifically inhibit NF-kappaB activity and found the marked reduction of GFAP protein levels in IkappaBalpha-SR-transfectant cells. Taken together, our results suggest that NF-kappaB may play pivotal roles in GFAP gene expression.
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Affiliation(s)
- Moon-Kyoung Bae
- Department of Oral Physiology, College of Dentistry, Pusan National University, Busan 602-739, South Korea
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Kim KA, Oh SO, Park PW, Park JY. Effect of probenecid on the pharmacokinetics of carbamazepine in healthy subjects. Eur J Clin Pharmacol 2005; 61:275-80. [PMID: 15915352 DOI: 10.1007/s00228-005-0940-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2005] [Accepted: 04/01/2005] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Carbamazepine (CBZ) undergoes biotransformation by CYP3A4 and CYP2C8, and glucuronide conjugation. There has been no clear demonstration to reveal the role of glucuronidation in the disposition of CBZ. We evaluated the effect of probenecid, a UDP-glucuronosyltransferase inhibitor, on the pharmacokinetics of CBZ in humans. METHODS In a randomized, open-label, two-way crossover study, ten healthy male subjects were treated twice daily for 10 days with 500 mg probenecid or with a matched placebo. On day 6, a single dose of 200 mg CBZ was administered orally. Concentrations of CBZ and CBZ 10,11-epoxide (CBZ-E) in plasma and urine were measured. RESULTS Probenecid decreased the area under the plasma concentration-time curve (AUC) of CBZ from 1253.9 micromol h/l to 1020.7 micromol h/l (P < 0.001) while increasing that of CBZ-E from 137.6 micromol h/l to 183.5 micromol h/l (P = 0.033). The oral clearance of CBZ was increased by probenecid by 26% (90% confidence interval, 17-34%; P < 0.001). Probenecid increased the AUC ratio of CBZ-E/CBZ from 0.11 to 0.16 (P < 0.001). However, probenecid had minimal effect on the recovery of the conjugated and free forms of CBZ and CBZ-E in urine. CONCLUSION Although probenecid showed a minimal effect on the glucuronidation of CBZ and CBZ-E, it increased CBZ biotransformation to CBZ-E, most likely reflecting the induction of CYP3A4 and CYP2C8 activities, in humans. These results demonstrate that glucuronide conjugation plays a minor role in the metabolism of CBZ and CBZ-E in humans, and that probenecid has an inducing effect on the disposition of CBZ.
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Affiliation(s)
- Kyoung-Ah Kim
- Department of Pharmacology and Gil Medical Center, Gachon Medical School and Clinical Trial Center, 1198 Kuwol-dong, Namdong-gu, Incheon, 405-760, Korea
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Hong JH, Oh SO, Lee M, Kim YR, Kim DU, Hur GM, Lee JH, Lim K, Hwang BD, Park SK. Enhancement of lysophosphatidic acid-induced ERK phosphorylation by phospholipase D1 via the formation of phosphatidic acid. Biochem Biophys Res Commun 2001; 281:1337-42. [PMID: 11243883 DOI: 10.1006/bbrc.2001.4517] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We made stable cell lines overexpressing PLD1 (GP-PLD1) from GP+envAm12 cell, a derivative of NIH 3T3 cell. PLD1 activity and extracellular signal-regulated kinase (ERK) phosphorylation were enhanced in GP-PLD1 cells by the treatment of lysophosphatidic acid (LPA). In contrast, these LPA-induced effects were attenuated with the pretreatment of pertussis toxin (PTX) or protein kinase C (PKC) inhibitor. Moreover, accumulation of phosphatidic acid (PA), a product of PLD action, potentiated the LPA-induced ERK activation in GP-PLD1 cells while blocking of PA production with the treatment of 1-butanol attenuated LPA-induced ERK phosphorylation. From these results, we suggest that LPA activate PLD1 through pertussis toxin-sensitive G protein and PKC-dependent pathways, then PA produced from PLD1 activation facilitate ERK phosphorylation.
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Affiliation(s)
- J H Hong
- Department of Pharmacology, School of Medicine, Taejon, Korea
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Abstract
Phospholipase D2 (PLD2) is expressed in brain and inhibited by synuclein, which is involved in Parkinson's and Alzheimer's diseases. However, the activation mechanism of PLD2 in neuronal cells has not been defined clearly. Hydrogen peroxide (H(2)O(2)) plays roles in the neurodegenerative diseases and also acts as a second messenger of various molecules such as nerve growth factor. To study regulation mechanisms of PLD2 by H(2)O(2) in neuronal cells, we have made stable PC12 cell lines expressing PLD2 (PLD2-PC12 cells). H(2)O(2) treatment stimulated PLD activity in PLD2-PC12 cells in a dose- and time-dependent manner. This activation was inhibited by the treatment with protein kinase C (PKC) inhibitors or by depletion of PKCalpha, -delta, and -epsilon. Phorbol ester markedly activated PLD2. Co-treatment with phorbol ester and H(2)O(2) did not show an additive effect. Chelation of extracellular calcium substantially blocked the H(2)O(2)-induced activation of PLD2. A calcium ionophore induced PLD2 activation in a PKC-dependent manner. Protein-tyrosine kinase inhibitors inhibited H(2)O(2)-induced PLD activation slightly. These data indicate that H(2)O(2) can activate PLD2 in PC12 cells and that this activation is largely dependent on PKC and Ca(2+) ions and minimally dependent on tyrosine phosphorylation.
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Affiliation(s)
- S O Oh
- Department of Biochemistry, College of Medicine, Chungnam National University, Taejeon, Korea
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Jung JS, Lee JY, Oh SO, Jang PG, Bae HR, Kim YK, Lee SH. Effect of t-butylhydroperoxide on chloride secretion in rat tracheal epithelia. Pharmacol Toxicol 1998; 82:236-42. [PMID: 9646329 DOI: 10.1111/j.1600-0773.1998.tb01431.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxidative stress has been known to play important roles in various inflammatory diseases of lung such as allergic bronchitis, dust particle-induced inflammatory diseases, or chronic bronchitis. However, the effects of oxidants on Cl- secretion in tracheal epithelia have not been determined. To examine the effects of oxidants on Cl- secretion of the airway epithelia rat tracheal epithelial cells were cultured on porous filters and short circuit current (Isc) was measured in an Ussing chamber system. t-Butylhydroperoxide, which was widely used as a model substance to study the mechanism of cell injury resulted from oxidative stress, induced a transient increase in Isc by dose-dependent manner. The response was not observed in Cl(-)-free medium, and inhibited by 100 microM bumetanide. N(-Diphenyl-1,4-phenylene-diamine (DPPD, 5 microM), an inhibitor of lipid peroxidation, blocked the t-butylhydroperoxide response. When t-butylhydroperoxide was added after the administration of forskolin or H-89, a protein kinase A inhibitor, the t-butylhydroperoxide-induce Isc increase was abolished. Pretreatment of indomethacin (10 microM) completely inhibited the t-butylhydroperoxide response, but pretreatment of thapsigargin (1 microM) did not, t-Butylhydroperoxide induced gradual increases in cytosolic Ca2+ level, and increased [3H]arachidonic acid release in the presence of thapsigargin. These results indicate that t-butylhydroperoxide stimulates Cl-secretion via activation of phospholipase A2 and subsequent production of cyclooxygenase metabolities by Ca(2+)-dependent and -independent mechanisms.
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Affiliation(s)
- J S Jung
- Department of Physiology, College of Medicine, Pusan National University, Korea
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Jung JS, Oh SO, Kim MG, Kang DS, Lee SH. Cl- secretion induced by 5-hydroxytryptamine and calcitonin gene-related peptide in rat tracheal epithelia. Pflugers Arch 1997; 435:20-7. [PMID: 9359899 DOI: 10.1007/s004240050479] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The effects of 5-hydroxytryptamine (5-HT) and calcitonin gene-related peptide (CGRP), which are colocalized in nerve terminals in the airway, on Cl- secretion in rat tracheal epithelia were tested. Short-circuit current (Isc) was measured after rat tracheal epithelial monolayers were cultured on porous filters. In rat tracheal monolayers 5-HT and CGRP increased Isc upon addition to the serosal compartment, in a dose-dependent manner with EC50 values at 5 micromol/l and 5 nmol/l, respectively. The responses were dependent on the presence of Cl- in the bathing solution and were inhibited by 100 micromol/l bumetanide. When 5-HT or CGRP was added after the administration of forskolin, the responses were not observed. 5-HT and CGRP increased the intracellular cAMP concentration. Low-Ca2+ buffer (0.1 mmol/l) and pretreatment with BAPTA/AM (10 micromol/l), thapsigargin (1 micromol/l) or indomethacin (10 micromol/l) did not affect the responses to 5-HT and CGRP. The 5-HT-induced response was not inhibited by 5-HT2 and/or 5-HT4 antagonists. These results indicate that in the rat tracheal epithelia 5-HT and CGRP increase Cl- secretion by an increase in intracellular cAMP concentration via direct activation of basolateral receptors, and that the response to 5-HT is not mediated via 5-HT4 receptors.
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Affiliation(s)
- J S Jung
- Department of Physiology, College of Medicine, Pusan National University, 1 Ga, Ami-Dong, Suh-Gu, Pusan, Korea
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Oh SO, Ibe BO, Johnson C, Kurantsin-Mills J, Raj JU. Platelet-activating factor in plasma of patients with sickle cell disease in steady state. J Lab Clin Med 1997; 130:191-6. [PMID: 9280146 DOI: 10.1016/s0022-2143(97)90095-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The role of platelet-activating factor (PAF) in the pathogenesis of microvascular vaso-occlusion in sickle cell disease (SCD) is not known. In order to assess a role for PAF in vaso-occlusion in patients with SCD in steady state conditions, we measured plasma PAF level and plasma PAF acetylhydrolase activity as indices of PAF metabolism in vivo. We also studied PAF synthesis, from (3H)-acetate, by purified platelets stimulated with A23187. PAF was extracted from plasma of ten patients with SCD in steady state and from age-matched controls. PAF, purified by thin-layer chromatography, was quantitated by radioimmunoassay. PAF level (mean +/- SEM, pg/ml) in plasma of controls was 393 +/- 65, which was significantly lower than the 797 +/- 62 measured in plasma of patients with SCD. There was no difference in acetylhydrolase activity between the two groups. PAF synthesis (mean +/- SEM, nmol/10(6) cells) by platelets of controls without exogenous lyso-PAF was 1.69 +/- 0.24, higher than the 0.59 +/- 0.038 synthesized by platelets of patients with SCD. Incubation of platelets with 1.0 micromol/L lyso-PAF increased PAF synthesis by controls to 8.93 +/- 1.76, still higher than the 4.59 +/- 0.98 synthesized by platelets of patients with SCD. Our data show that patients with SCD are susceptible to a higher circulating levels of PAF in vivo during steady-state conditions. We speculate that higher levels of PAF may be a contributing factor to the persistent stress and inflammatory state of the microcirculation of patients with SCD.
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Affiliation(s)
- S O Oh
- Department of Pediatrics, University of California at Los Angeles School of Medicine, Torrance, USA
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Abstract
An infant presented with persistent epiphora after successful probing of the lacrimal system. Examination of the nose showed a cystic structure occluding lower portion of the lacrimal drainage system. In cases of recurrent obstruction, nasal examination and endoscopic marsupialization may help guide the clinician towards the most appropriate treatment.
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Affiliation(s)
- M Y Choi
- Department of Ophthalmology, College of Medicine, Chungbuk National University, Korea
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Abstract
In adjustable strabismus surgery, a satisfactory final result would be achieved with delayed adjustment. However, the postoperative adhesions following strabismus surgery make delayed adjustment impossible. We evaluated the efficacy of mitomycin C in reducing the severity of postoperative adhesions following strabismus surgery and in delaying the time adjustment after surgery. Experimental rabbits underwent a hang-back recession procedure in the superior rectus muscle. A topical application of mitomycin C was made between the conjunctiva and the sclera for 5 minutes during the operation. We then studied the possible time of delayed adjustment and estimated the minimal forces required for the adjustment. The topical application of 0.1 mg/ml mitomycin C between the conjunctiva and sclera allowed for a 2-week delayed adjustment after surgery, and 0.2 mg/ml mitomycin C prevented the adhesions between these tissues and the muscle 5 weeks after surgery. These results suggest that topical mitomycin C may enhance the success rate of strabismus surgery with delayed adjustment and reduce postoperative adhesions.
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Affiliation(s)
- S O Oh
- Department of Opthalmology, College of Medicine, Chungbuk National University, Cheongju, Korea
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Abstract
An animal experiment was done to evaluate the efficacy of tissue coating with sodium hyaluronic acid and subconjunctival injection of triamcinolone acetate in reducing the severity of postoperative adhesions following strabismus surgery. Experimental animals underwent a mild traumatic surgical procedure in one superior rectus muscle and a severe traumatic surgical procedure in the other superior rectus muscle. Each group was divided into control group, sodium hyaluronate coating group and triamcinolone acetonide injection group. Grading the severity of adhesions through surgical exploration of operative sites and histological comparison after 4 weeks revealed a significant reduction of postoperative adhesions in sodium hyaluronate group compared with control group under conditions of severe surgical trauma. But triamcinolone groups have no significant differences compared with control groups by statistical analysis. Tissue protection afforded by sodium hyaluronate may lead to an effective method which minimizes the surgical trauma to the tissues and reduces the postsurgical adhesions following strabismus surgery.
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Affiliation(s)
- S O Oh
- Department of Ophthalmology, College of Medicine, Seoul National University, Korea
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18
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Abstract
Isoflurane or halothane was administered at two different inspired concentrations to 21 surgical patients whose average age was 62 years. Most were in physical status (ASA) II or III. Patients were premedicated with diazepam and atropine, anesthesia was induced with thiopental, and tracheal intubation was facilitated with succinylcholine. Respiration was controlled manually or with a ventilator. Anesthesia was maintained with 60 percent N2O and halothane 1 percent, then 0.5 percent, or with N2O-isoflurane 1.2 percent, then 0.6 percent in O2. Variations in the cardiovascular responses among patients given the same anesthetic were as great as the variation in responses between anesthetics. Both produced similar decreases in arterial pressure, cardiac output, and stroke volume. Changes in pulse rate were minimal, and total peripheral resistance changes quite variable, for both drugs. Both halothane and isoflurane appear satisfactory for inhalation anesthesia in the elderly.
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