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Lee MS, Kang MJ, Kim MY, Kim HO, Song KY, Park YM. Congenital Bednar tumour (pigmented dermatofibrosarcoma protuberans). J Eur Acad Dermatol Venereol 2008; 22:509-11. [DOI: 10.1111/j.1468-3083.2007.02373.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Park HS, Jang KY, Kang MJ, Song KJ, Lee KB. Oncocytoma of the spinal cord causing paraplegia – a case report. Spinal Cord 2006; 45:183-6. [PMID: 16505829 DOI: 10.1038/sj.sc.3101905] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
STUDY DESIGN Case report. OBJECTIVES To describe a rare case of oncocytoma arising from the spinal cord in a 40-year old woman. SETTING Republic of Korea. METHODS The patient's history, physical examination, radiological and pathological findings were reviewed. RESULTS A 40-year-old woman presented with 3-month history of low back pain. Magnetic resonance imaging revealed an intradural extramedullary mass located between L1 and L4. She refused any surgical treatment and so was discharged. At 10 days after discharge, an emergency operation was performed because of sudden paralysis in both lower extremities. The confirmed diagnosis is oncocytoma. At 4 months after surgery, the patient failed to obtain neurological recovery from complete paraplegia. CONCLUSIONS Since the progression of an intradural extramedullary mass that shows minor neurological symptoms can lead to complete paraplegia in a short time, close observation and early surgical decompression are necessary.
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Hwang EA, Kang MJ, Han SY, Park SB, Kim HC. Viral infection following kidney transplantation: long-term follow-up in a single center. Transplant Proc 2005; 36:2118-9. [PMID: 15518767 DOI: 10.1016/j.transproceed.2004.08.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Viral infections are a leading cause of posttransplantation morbidity and mortality. The use of more potent immunosuppressive agents is responsible in part for the increasing incidence of some viral infections. This study summarized our experience with viral infections in 561 kidney transplant recipients. METHODS The spectrum of viral infections in 561 consecutive kidney transplant recipients was examined retrospectively from November 1982 to November 2002. RESULTS During a mean follow-up of 64.0 months, 193 virus infections in 156 of 561 kidney transplant recipients were recorded, an incidence of 34.2%. The most common viruses were cytomegalovirus (36.3%), varicella zoster virus (29.0%), herpes simplex virus (23.8%), BK virus (4.7%), hepatitis B virus (3.6%), and hepatitis C virus (2.6%). Among the CMV infections, 77.1% developed subclinical CMV infection and 22.9% had CMV disease. Generalized herpes zoster infection occurred in three cases and chicken pox in six cases. During a mean follow-up of 64.0 months, two of 159 patients died of CMV pneumonia. CONCLUSION Viral infections among the kidney transplant recipients continue to be a major problem despite significant progress in understanding the pathogenesis of viral infection and the advent of antiviral therapy.
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Kim HC, Hwang EA, Kang MJ, Han SY, Park SB, Park KK. BK virus infection in kidney transplant recipients. Transplant Proc 2005; 36:2113-5. [PMID: 15518765 DOI: 10.1016/j.transproceed.2004.08.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Nephropathy associated with the polyomavirus type BK virus (BKV) has emerged as a cause of allograft failure linked to immunosuppressive regimens containing tacrolimus or mycophenolate mofetil (MMF). The outcome in BKV nephropathy is generally unfavorable, namely 50% of patients lose graft function. We herein report nine cases of BKV nephropathy after kidney transplantation. METHODS From October 1998 to May 2003, 138 of 169 consecutive kidney transplant patients received tacrolimus-based immunosuppression, and 31 received cyclosporine-based immunosuppression. Additionally, 88.2% of the patients received mycophenolate mofetil (MMF). The diagnosis of BK infection was made by the presence of decoy cells in the urine and by allograft biopsy. RESULTS There were nine cases of BKV nephropathy in kidney transplant recipients, an incidence of 5.3%. All patients with BKV nephropathy received tacrolimus, MMF, and steroids. The median time to diagnosis of BKV infection was 7.8 months after transplantation. All patients experienced an elevated serum creatinine, which stabilized or decreased in seven patients with altered or decreased immunosuppression. After a mean follow-up of 11.1 months, 2 (22.2%) of nine patients lost the graft. CONCLUSION Because BKV nephropathy is a rare but serious complication after kidney transplantation, it should be included in the clinical differential of transplant dysfunction. In the absence of documented antiviral treatment, early diagnosis and judicious use of immunosuppressive agents is indicated to minimize the occurrence of BKV infection.
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Park SB, Kang MJ, Whang EA, Han SY, Kim HC. A case of fungal sepsis due to aspergillus spondylitis followed by cytomegalovirus infection in a renal transplant recipient. Transplant Proc 2004; 36:2154-5. [PMID: 15518782 DOI: 10.1016/j.transproceed.2004.08.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UNLABELLED Although advances in immunosuppressive therapy have led to increased survival of renal transplant recipients, there are greater risks of developing infectious complications. Because of its rarity and the lack of medical awareness, aspergillus spondylitis is often misdiagnosed as tuberculous spondylitis, especially in its early stages. We report a case of aspergillus spondylitis in a renal transplant followed by cytomegalovirus (CMV) retinitis. CASE A 59-year-old woman was admitted due to general weakness and abdominal discomfort. She had undergone renal transplantation 3 years previously. One month before admission, she was diagnosed with CMV retinitis and treated with IV ganciclovir. On admission, she suffered from lower abdominal pain. Colonoscopy revealed multiple circular or patchy ulcers with surrounding severe mucosal edema in the sigmoid colon findings consistent with intestinal tuberculosis. On hospital day 30, she complained of lower extremity paresthesia and weakness. An MRI of the spine revealed a well-demarcated paraspinal mass around the L2-4 body; tuberculous spondylitis was initially considered. But despite antituberculosis medication, the patient progressed to spastic paraparesis and sensory changes in both lower legs, requiring urgent surgical decompression. At hospital day 60, she suffered persistent fever and developed thrombocytopenia. Wound discharge continued and paraparesis became denser. A CT of the spine showed progression of the paraspinal abscess from the L2 body to the iliac crest. CT-guided psoas muscle drainage was performed. Fungal culture showed Aspergillus species. Despite antifungal therapy, the patient died after a prolonged hospital stay due to fungal sepsis and septic shock from aspergillosis.
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Park SB, Kang MJ, Whang EA, Han SY, Kim HC, Park KK. A case of primary cutaneous aspergillosis in a renal transplant recipient. Transplant Proc 2004; 36:2156-7. [PMID: 15518783 DOI: 10.1016/j.transproceed.2004.08.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
UNLABELLED Opportunistic fungal infections are life-threatening complications which are a major cause of morbidity and mortality in immunocompromized hosts such as those who have undergone organ transplantation. Aspergillosis comprises a spectrum of disease caused by a ubiquitous saprophytic mold. Invasive aspergillus is a serious life-threatening complication in immunocompromised hosts. Primary cutaneous aspergillosis occurs relatively less frequently and is poorly characterized. We report a case of cutaneous aspergillosis in a 51-year-old renal transplant recipient, which was successfully treated with local excision and concomitant antifungal therapy. CASE A 51-year-old male renal transplant recipient presented with cutaneous nodules on the dorsum of the right hand. He underwent renal transplantation for end-stage renal disease due to adult dominant polycystic kidney disease (ADPKD) 3 years prior. Initially he suffered an acute rejection episode that was treated with steroid pulse and OKT3 therapy. Eventually he was stabilized on a combination of tacrolimus, prednisone, and mycophenolate mofetil. Three years after transplantation, he developed painless multiple (largest one 5 x 3 cm sized) nodules on the dorsum of his right hand. He was afebrile with no systemic symptoms. A skin biopsy showed a dense solid infiltration of giant cells, histiocytes, and lymphoplasma cells admixed with intra- and extracellular fungal hyphae and spores. The hyphae were septate and acute angle branching, which was consistent with aspergillosis. Oral itraconazole 200 mg/d for 5 weeks was ineffective. Treatment with liposomal amphotericin B for 4 weeks was initiated and MMF was discontinued. The medication was well tolerated with no hepatotoxic effects. Although new lesions did not appear, existing ones did not significantly improve after 4 weeks of treatment. Therefore, most lesions were excised surgically and liposomal amphotericin B continued for 2 weeks followed by treatment with oral fluconazole for 2 months. Ten moths later there was no evidence of recurrence.
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Yu HC, Cho BH, Chung MJ, Kang MJ, La BJ, Kim W, Kang SK, Park SK. A case of giant condylomata acuminata involving anus after renal transplantation. Clin Nephrol 2003; 59:235-6. [PMID: 12653272 DOI: 10.5414/cnp59235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Kim W, La BJ, Lee S, Yu HC, Cho BH, Kang MJ, Park SK. A case of early onset cyclosporine-induced hemolytic uremic syndrome resulting in renal graft loss. Clin Nephrol 2003; 59:148-50. [PMID: 12608560 DOI: 10.5414/cnp59148] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Jang KY, Kang MJ, Lee DG, Chung MJ. Utility of thyroid transcription factor-1 and cytokeratin 7 and 20 immunostaining in the identification of origin in malignant effusions. ANALYTICAL AND QUANTITATIVE CYTOLOGY AND HISTOLOGY 2001; 23:400-4. [PMID: 11777274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To estimate the utility of thyroid transcription factor-1 (TTF-1) and the combined cytokeratin 7 (CK7) and 20 (CK20) immunoprofile as a marker for identifying the primary site of metastatic adenocarcinoma in effusions of the serous cavity. STUDY DESIGN Formalin-fixed, paraffin-embedded cell block specimens of pleural and peritonealfluid diagnosed as metastatic adenocarcinomas with known sites of origin were used for TTF-1, CK7 and CK20 immunohistochemistry. The primary sites of these cases were lung (16 cases), ovary (15), stomach (9), colon (8) and breast (8) and were confirmed by radiologic and/or histologic evaluation. RESULTS The lung adenocarcinomas showed TTF-1 positivity in 81% (13/16) of cases. All nonpulmonary adenocarcinomas lacked TTF-1 staining. The CK7-/CK20+ immunophenotype was seen in 63% of colonic adenocarcinomas and not seen in lung, ovary, stomach or breast adenocarcinomas. The CK7+/CK20- immunophenotype was seen in 100%, 88% and 87% of cases that originated in the lung, breast and ovary, respectively. CONCLUSION TTF-7 immunostaining is useful in the differentiation between pulmonary and nonpulmonary origin of adenocarcinomas in malignant effusions. The combination of CK7-/CK20+ immunostaining is useful in identifying colon adenocarcinomas.
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Suh ME, Kang MJ, Park SY. The 3-D QSAR study of anticancer 1-N-substituted imidazo- and pyrrolo-quinoline-4,9-dione derivatives by CoMFA and CoMSIA. Bioorg Med Chem 2001; 9:2987-91. [PMID: 11597480 DOI: 10.1016/s0968-0896(01)00196-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The 3-D QSAR analysis with new imidazo- and pyrrolo-quinolinedione derivatives was conducted by Comparative Molecular Field Analysis (CoMFA) and Comparative Molecular Similarity Indices Analysis (CoMSIA). When crossvalidation value (q(2)) is 0.844 at four components, the Pearson correlation coefficient (r(2)) of the CoMFA is 0.964. In the CoMSIA, q(2) is 0.709 at six components and r(2) is 0.969. Unknown samples were analyzed, using QSAR analyzed results from the CoMFA and CoMSIA methods. Excellent agreement was obtained between, with an error range of 0.01-0.15 the calculated values and measured in vitro cytotoxic activities against human lung A-549 cancer cell lines.
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Minekura H, Kang MJ, Inagaki Y, Suzuki H, Sato H, Fujino T, Yamamoto TT. Genomic organization and transcription units of the human acyl-CoA synthetase 3 gene. Gene 2001; 278:185-92. [PMID: 11707336 DOI: 10.1016/s0378-1119(01)00714-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Acyl-CoA synthetases (ACSs) play an essential role in fatty acid metabolism. ACS3 is an arachidonate-preferring enzyme expressed in a wide range of human tissues including brain, heart, placenta, prostate, skeletal muscle, testis and thymus. As an initial step to understanding the transcriptional regulation of the human ACS3 gene, we analyzed the genomic organization and transcription units of the human ACS3 gene. Sequence analysis of genomic clones demonstrates that the human ACS3 gene spans at least 80.6 kb and contains 17 exons. The human ACS3 gene was mapped between the sequence-tagged site markers D2S360 and WI-21901. Sequence inspection of the 5'-flanking region revealed potential DNA elements including CCAAT, AP-1, Oct-1, GATAs, SRY, CdxA, Nkx-2.5, c-Myb, HSF2, NF-AT, AP-2, NF-Y, and p300. A minimal promoter region required for the expression of the human ACS3 gene in melanoma G361 cells was determined.
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Abstract
Sarcomatoid carcinoma is a rare biphasic tumor characterized by a combination of malignant epithelial and mesenchymal cells. We report a rare case of sarcomatoid carcinoma of the colon. A 41-yr-old woman was hospitalized with a history of melena. Total colectomy was performed under the impression of colonic carcinoma. Histologically, the tumor was composed of differentiated adenocarcinoma in superficial portion and sarcomatoid spindle cells in deeper portion with a transitional area between the two portions. The sarcomatous areas revealed polygonal and spindle-shaped anaplastic malignant cells arranged in sheet, short fascicular or haphazard pattern. Immunohistochemically, tumor cells showed a positive immunoreaction for cytokeratin, epithelial membrane antigen, and vimentin. The histopathological and immunohistochemical transitions between the adenocarcinoma area and the spindle cell area suggested that the sarcomatous elements originated from the adenocarcinoma during tumor progression.
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Kang MJ, Yoon KH, Lee SS, Lee JM, Ahn YB, Chang SA, Kang MI, Cha BY, Lee KW, Son HY, Kang SK, Hong YK. Hypodipsic hypernatremia with intact AVP response to non-osmotic stimuli induced by hypothalamic tumor: a case report. J Korean Med Sci 2001; 16:677-82. [PMID: 11641544 PMCID: PMC3057589 DOI: 10.3346/jkms.2001.16.5.677] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Anatomical lesions of hypothalamic area associated with hypodipsic hypernatremia have been reported only rarely. We report here a case of hypodipsic hypernatremia induced by a hypothalamic lesion. A 25-yr-old man, who had been treated with radiation for hypothalamic tumor 5-yr before, was admitted for evaluation of hypernatremia and hypokalemia. He never felt thirst despite the elevated plasma osmolality and usually refused to drink intentionally. Plasma arginine vasopressin (AVP) level was normal despite the severe hypernatremic hyperosmolar state and urine was not properly concentrated, while AVP secretion was rapidly induced by water deprivation and urine osmolality also progressively increased to the near maximum concentration range. All of these findings were consistent with an isolated defect in osmoregulation of thirst, which was considered as the cause of chronic hypernatremia in the patient without an absolute deficiency in AVP secretion. Hypokalemia could be induced by activation of the renin-angiotensin-aldosterone system as a result of volume depletion. However, inappropriately low values of plasma aldosterone levels despite high plasma renin activity could not induce symptomatic hypokalemia and metabolic alkalosis. The relatively low serum aldosterone levels compared with high plasma renin activity might result from hypernatremia. Hypernatremia and hypokalemia were gradually corrected by intentional water intake only.
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Abstract
Glomerulonephritis associated with visceral abscess is being increasingly recognized. The association of glomerulonephritis with visceral suppuration in the absence of endocarditis was first described by Whitworth and associates. Abscesses were most frequently located in the respiratory tract but have been reported at numerous other sites, including appendix, uterus, aorto-femoral bypass graft and cutaneous wound. This report documents the apparently rare occurrence of glomerulonephritis with acute renal failure in association with pyogenic liver abscess. The need for awareness of glomerulonephritis as a cause of acute renal failure in pyogenic liver abscess is highlighted.
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Minekura H, Kang MJ, Inagaki Y, Cho YY, Suzuki H, Fujino T, Yamamoto TT. Exon/intron organization and transcription units of the human acyl-CoA synthetase 4 gene. Biochem Biophys Res Commun 2001; 286:80-6. [PMID: 11485311 DOI: 10.1006/bbrc.2001.5357] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Acyl-CoA synthetase 4 (ACS4) is an arachidonate-preferring isozyme of ACS family predominantly expressed in steroidogenic tissues. Isolation and characterization of genomic clones encoding human ACS4 revealed that the genomic organization of the gene. The human ACS4 gene spans approximately 90 kb and consists of 16 exons. Sequence inspection of the 5'-flanking region revealed potential DNA elements including GATAs, p300, AP-4, SRY, CREB and MyoD. A minimal promoter region required for the expression of ACS4 in HeLa S3 cells was determined. The human ACS4 gene was mapped between the STS markers, WI-17685 and CHLC.GATA81B07 on Xq22-23 region.
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Cho YY, Kang MJ, Sone H, Suzuki T, Abe M, Igarashi M, Tokunaga T, Ogawa S, Takei YA, Miyazawa T, Sasano H, Fujino T, Yamamoto TT. Abnormal uterus with polycysts, accumulation of uterine prostaglandins, and reduced fertility in mice heterozygous for acyl-CoA synthetase 4 deficiency. Biochem Biophys Res Commun 2001; 284:993-7. [PMID: 11409893 DOI: 10.1006/bbrc.2001.5065] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Arachidonate released by various stimuli is rapidly reesterified into membrane phospholipids initiated by acyl-CoA synthetase (ACS) and subsequent acyl-transfer reactions. ACS4 is an arachidonate-preferring enzyme abundant in steroidogenic tissues and postulated to modulate eicosanoid production. Female mice heterozygous for ACS4 deficiency become pregnant less frequently and produce small litters with extremely low transmission of the disrupted alleles. Striking morphological changes, including extremely enlarged uteri and lumina filled with numerous proliferative cysts of various sizes, were detected in ACS4+/- females. Furthermore, marked accumulation of prostaglandins was seen in the uterus of the heterozygous females. These results indicate that ACS4 modulates female fertility and uterine prostaglandin production.
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Park WY, Hwang CI, Kang MJ, Seo JY, Chung JH, Kim YS, Lee JH, Kim H, Kim KA, Yoo HJ, Seo JS. Gene profile of replicative senescence is different from progeria or elderly donor. Biochem Biophys Res Commun 2001; 282:934-9. [PMID: 11352641 DOI: 10.1006/bbrc.2001.4632] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In vitro cellular senescence of human diploid fibroblast has been a good model for aging research, which shows similar phenotypes to in vivo aging. Gene expression profiling would provide an insight to understand the mechanism of senescence. Using cDNA microarray containing 384 known genes, we compared the expression profiles of three different types of aging models: replicative senescence, fibroblasts from progeria or from elderly donor. Although all of them showed senescence phenotypes, distinct sets of genes were altered in each group. Pairwise plots or cluster analysis of activation fold of gene expression revealed closer relationships between fibroblasts from progeria or from old individual, but not between replicative senescence fibroblasts and either models. Differential expression pattern of several genes were confirmed by RT-PCR. We suggest that the replicative senescence model might behave differently to other types of aging models due to the distinct gene expression.
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Park YM, Matsumoto K, Shinkoda H, Nagashima H, Kang MJ, Seo YJ. Age and gender difference in habitual sleep-wake rhythm. Psychiatry Clin Neurosci 2001; 55:201-2. [PMID: 11422841 DOI: 10.1046/j.1440-1819.2001.00825.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We analysed the effects of age and gender on the habitual sleep-wake rhythm in 2252 randomly selected subjects living in Shimonoseki, Japan. Subjects were divided into 21 age groups with a matching number of males and females for each. During the period from primary school to adolescence, the bedtime became delayed and sleep length decreased with age. After that period, with increasing age, bedtime became earlier and sleep length increased. The number of awakenings and the length of daytime naps increased markedly with epoch after 50 years and 70 years of age, respectively. Gender differences were considered to be due to the women's social and domestic customs in Japan.
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Kang MJ, Tholey A, Heinzle E. Application of automated matrix-assisted laser desorption/ionization time-of-flight mass spectrometry for the measurement of enzyme activities. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2001; 15:1327-33. [PMID: 11466793 DOI: 10.1002/rcm.376] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Sample preparation methods and data acquisition protocols were optimized for the application of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) to high-throughput quantitative analysis of low molecular mass substrates and products of an enzyme-catalyzed reaction. Using a deuterlum-labeled internal standard, precise standard curves were obtained (r(2) = 0.9998) over two orders of magnitude of concentration of rac-1-phenylethylamine (PEA), which is converted to 2-methoxy-N-[(1R)-1-phenylethyl]acetamide (MET) by a lipase-catalyzed reaction with ethylmethoxyacetate (EMA) as second substrate. Reliable relative standard deviations were achieved (< or =5%) using automated analysis with peak intensity ratios between 0.2 and 5 of analyte to internal standard. This method permitted quantitative analysis of the lipase reaction, producing results comparable to those from gas chromatographic (GC) analysis in the dynamic range of GC. This work shows that MALDI-TOFMS can be applied for the high-throughput screening of enzymes.
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Yang HC, Yun JS, Kang MJ, Kang Y, Kim JH. Mechanisms and kinetics of high-temperature cadmium sorption by packed bed of calcined kaolin. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2001; 36:1689-1707. [PMID: 11688684 DOI: 10.1081/ese-100106252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Sorption experiments by passing CdCl2-carrying flue gas through the packed bed of calcined macro-porous kaolin particles were performed over a temperature range of 973-1173K and a CdCl2 partial pressure range of 8-16.1 Pa. The observed structural change of the sorbent mineral at the stage of sorption and the results of desorption tests revealed the characteristics of an irreversible chemical reaction as a major cadmium capturing mechanism. In the fully saturated kaolin sorbent, CdO x Al2O x 2SiO2 is present as a sorption reaction product together with a smaller amount of 2CdO x Al2O x 2SiO2. The increase in sorbent bed temperature resulted in an increase in the rate of sorption, but it had no effect on maximum cadmium uptake. The gas-phase CdCl2 diffusion into the macro pores of calcined kaolin had a negligible effect on the overall sorption rate. The reaction between gaseous CdCl2 and solid Al2O3 x 2SiO2 is very sensitive to the concentration of CdCl2 but relatively insensitive to the temperature of the sorbent bed. The order of reaction with respect to the CdCl2 vapor concentration was determined to be 3.26. The activation energy, Ea, was estimated as 5.56 kcal/mol according to the Arrhenius relationship.
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Yamashita Y, Kumabe T, Cho YY, Watanabe M, Kawagishi J, Yoshimoto T, Fujino T, Kang MJ, Yamamoto TT. Fatty acid induced glioma cell growth is mediated by the acyl-CoA synthetase 5 gene located on chromosome 10q25.1-q25.2, a region frequently deleted in malignant gliomas. Oncogene 2000; 19:5919-25. [PMID: 11127823 DOI: 10.1038/sj.onc.1203981] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Acyl-CoA synthetase (ACS) ligates fatty acid and CoA to produce acyl-CoA, an essential molecule in fatty acid metabolism and cell proliferation. ACS5 is a recently characterized ACS isozyme highly expressed in proliferating 3T3-L1 cells. Molecular characterization of the human ACS5 gene revealed that the gene is located on chromosome 10q25.1-q25.2, spans approximately 46 kb, comprises 21 exons and 22 introns, and encodes a 683 amino acid protein. Two major ACS5 transcripts of 2.5- and 3.7-kb are distributed in a wide range of tissues with the highest expression in uterus and spleen. Markedly increased levels of ACS5 transcripts were detected in a glioma line, A172 cells, and primary gliomas of grade IV malignancy, while ACS5 expression was found to be low in normal brain. Immunohistochemical analysis also revealed strong immunostaining with an anti-ACS5 antibody in glioblastomas. U87MG glioma cells infected with an adenovirus encoding ACS5 displayed induced cell growth on exposure to palmitate. Consistent with the induction of cell growth, the virus infected cells displayed induced uptake of palmitate. These results demonstrate a novel fatty acid-induced glioma cell growth mediated by ACS5.
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Abstract
Histochemical, immunohistochemical and ultrastructural studies were performed on cases of hepatocellular carcinoma (HCC) with pale bodies (PB). HCC containing PBs was observed in 3 (5.5%) of 55 consecutively resected HCC cases. Histologically, a large number of hepatocytes displayed pale or eosinophilic staining of the cytoplasm, resulting in ground-glass appearance. They were aggregated in nodular pattern, or diffusely intermixed with other malignant hepatocytes. PBs were negative for periodic-acid Schiff and Masson's trichrome staining. The inclusions showed a strong positive reaction for fibrinogen and some of them were weakly positive for albumin but negative for hepatitis B surface antigen, hepatitis B core antigen, alpha-fetoprotein and alpha-1-antitrypsin. Ultrastructurally, PBs were membrane-bound and contained granular materials of moderate electron density, and were closely related to dilated rough endoplasmic reticulum. These findings support that PBs are secretory fibrinogen accumulated in cystic ER and that such intracellular accumulation possibly reflects a defective transport of fibrinogen.
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Kang MJ, Ingram A, Ly H, Thai K, Scholey JW. Effects of diabetes and hypertension on glomerular transforming growth factor-beta receptor expression. Kidney Int 2000; 58:1677-85. [PMID: 11012901 DOI: 10.1046/j.1523-1755.2000.00328.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Several studies have suggested that transforming growth factor-beta1 (TGF-beta1) is an important determinant of diabetic glomerular injury. TGF-beta1 forms a heteromeric complex with two cellular receptor subtypes, designated TGF-beta RII and TGF-beta RI, but the effects of diabetes mellitus on glomerular TGF-beta receptor expression have not been completely elucidated. We first compared the effect of experimental type I diabetes mellitus and uninephrectomy on glomerular TGF-beta receptor expression in spontaneously hypertensive rats (SHRs), and then sought to determine whether changes in TGF-beta receptor expression were strain specific by studying normotensive Wistar-Kyoto (WKY) rats. METHODS Five groups of male SHRs were studied. The first group received streptozotocin (60 mg/kg IV) and was studied after one week. The second group received streptozotocin and was studied after two weeks. The third group received streptozotocin (60 mg/kg IV) but received insulin to maintain euglycemia. The fourth group of age-matched SHRs served as the control group, while a fifth group of SHRs underwent uninephrectomy. Four groups of male WKY rats were also studied. The first group of WKY rats served as the age-matched control group. The second group of WKY rats received streptozotocin, while a third group of WKY rats underwent uninephrectomy. The fourth group underwent uninephrectomy and received streptozotocin. At each time point, glomeruli were isolated for protein extraction, and the protein was subjected to Western blot analysis of TGF-beta RII and TGF-beta RI expression. RESULTS Basal expression of both TGF-beta receptors per microgram of glomerular protein was similar in normotensive WKY rats and hypertensive SHRs. Hyperglycemia (blood glucose level, 17.8 +/- 2.9 mmol/L) led to an early twofold increase in TGF-beta RII protein expression and a fourfold increase in TGF-beta RI protein expression in the glomeruli of hypertensive diabetic SHRs compared with euglycemic SHRs (blood glucose level, 5.8 +/- 0.8 mmol/L), which was sustained after two weeks. Insulin treatment (blood glucose level, 5. 2 +/- 0.9 mmol/L) normalized both TGF-beta RII and TGF-beta RI expression in the glomeruli of SHRs that received streptozotocin. Glomerular capillary hypertension in the uninephrectomized SHRs led to a twofold increase in glomerular TGF-beta RII protein expression, but did not reproduce the effect of diabetes mellitus on TGF-beta RI expression. In contrast to the findings in SHRs, neither hyperglycemia (blood glucose level, 15.5 +/- 2.1 mmol/L), uninephrectomy, nor hyperglycemia (blood glucose level, 16.8 +/- 3.0 mmol/L) and uninephrectomy altered TGF-beta receptor expression in the glomeruli of normotensive WKY rats. CONCLUSION These studies support the hypothesis that hemodynamic factors and metabolic factors influence glomerular TGF-beta receptor in vivo in the SHRs.
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Cho YY, Kang MJ, Ogawa S, Yamashita Y, Fujino T, Yamamoto TT. Regulation by adrenocorticotropic hormone and arachidonate of the expression of acyl-CoA synthetase 4, an arachidonate-preferring enzyme expressed in steroidogenic tissues. Biochem Biophys Res Commun 2000; 274:741-5. [PMID: 10924347 DOI: 10.1006/bbrc.2000.3207] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acyl-CoA synthetase 4 (ACS4) is an arachidonate-preferring enzyme abundant in steroidogenic tissues. We demonstrate that ACS4 expression in steroidogenic tissues in vivo is induced by adrenocorticotropic hormone (ACTH) and suppressed by glucocorticoid. ACTH also induced ACS4 protein but not its mRNA in Y1 adrenocortical tumor cells, whereas both ACS4 mRNA and protein were increased by dibutyryl cAMP (db-cAMP) and forskolin. Furthermore, the levels of ACS4 mRNA and protein in Y1 cells were induced by arachidonate. These data suggest that ACS4 expression in steroidogenic cells is regulated in coordination with induced steroidogenesis and arachidonate released by cholesterol ester hydrolase.
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Abstract
Diffuse hepatic hemangiomatosis without extrahepatic lesions is extremely rare in adults. A case of diffuse hepatic hemangiomatosis involving right lobe in a 50-year-old woman was presented. The hemangiomatosis was demonstrated by ultrasonography, computerized tomography (CT) and magnetic resonance image (MRI), and was confirmed histopathologically. Although diffuse hepatic hemangiomatosis is a rare disease in adults, its diagnosis should be considered in patients with diffuse tumor growth in one or both hepatic lobes and distinguished from malignant tumors. The present case is the first documented case of diffuse hepatic hemangiomatosis in an adult in Korea.
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