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Yoo KH, Kim HS, Lee SJ, Park SH, Kim SJ, Kim SH, La Choi Y, Shin KH, Cho YJ, Lee J, Rha SY. Efficacy of pazopanib monotherapy in patients who had been heavily pretreated for metastatic soft tissue sarcoma: a retrospective case series. BMC Cancer 2015; 15:154. [PMID: 25885855 PMCID: PMC4438639 DOI: 10.1186/s12885-015-1160-x] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 03/04/2015] [Indexed: 02/06/2023] Open
Abstract
Background We retrospectively reviewed outcomes of treatment with pazopanib, an oral multi-tyrosine kinase angiogenesis inhibitor, in patients with advanced soft tissue sarcoma, a rare and heterogeneous tumor group with limited treatment options. Methods Between 2009 and 2013, 43 patients with metastatic soft tissue sarcoma received pazopanib as salvage chemotherapy after one or more cytotoxic regimens. Response rate, progression-free survival, and overall survival were analyzed according to histological subtype, Eastern Cooperative Oncology Group performance status, and metastatic site. Results Common histological subtypes included leiomyosarcoma (n = 9), angiosarcoma (n = 6), malignant fibrous histiocytoma/undifferentiated pleomorphic sarcoma (MFH/UPS, n = 5), malignant peripheral nerve sheath tumor (MPNST, n = 5), and synovial sarcoma (n = 4). Nineteen patients (44.2%) received more than two chemotherapy regimens before pazopanib. At the time of analysis, 208 treatment cycles of pazopanib had been administered (median, 4.8 cycles per patient), and no treatment-related mortality occurred. The disease control rate was 61.0% (95% confidence interval [CI], 46.1–75.9%), and the overall response rate was 17.1% (partial response, n = 7; complete response, n = 0). Partial response was achieved in two patients with synovial sarcoma, two with MFH/UPS, one with MPNST, one with leiomyosarcoma, and one with angiosarcoma. The median lengths of progression-free survival and overall survival were 5.0 months (95% CI, 3.6–6.4 months) and 8.2 months (95% CI, 5.8–10.6 months), respectively. Progression-free survival was shorter in the patients with liposarcoma and rhabdomyosarcoma (1.3 and 0.9 months, respectively) than in those with leiomyosarcoma, MPNST, MFH/UPS, and synovial sarcoma (5.6, 6.5, 7.1, and 7.7 months, respectively). Conclusions Pazopanib demonstrated acceptable antitumor activity in the Asian patients who had been heavily pretreated for sarcoma, with seemingly more favorable results in the patients with leiomyosarcoma, MPNST, MFH/UPS, and synovial sarcoma than in those with liposarcoma and rhabdomyosarcoma. Electronic supplementary material The online version of this article (doi:10.1186/s12885-015-1160-x) contains supplementary material, which is available to authorized users.
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Kim IY, Lee S, Kwon HJ, Lee K, Yoo KH, Cha HS, Koh EM, Lee J. Pituitary Granulomatosis with Polyangiitis Presenting with Central Diabetes Insipidus. JOURNAL OF RHEUMATIC DISEASES 2015. [DOI: 10.4078/jrd.2015.22.3.195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kwon HJ, Yoo KH, Kim IY, Lee S, Jang HR, Kwon GY. Megalocytic interstitial nephritis following acute pyelonephritis with Escherichia coli bacteremia: a case report. J Korean Med Sci 2015; 30:110-4. [PMID: 25552891 PMCID: PMC4278017 DOI: 10.3346/jkms.2015.30.1.110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 08/27/2014] [Indexed: 11/29/2022] Open
Abstract
Megalocytic interstitial nephritis is a rare form of kidney disease caused by chronic inflammation. We report a case of megalocytic interstitial nephritis occurring in a 45-yrold woman who presented with oliguric acute kidney injury and acute pyelonephritis accompanied by Escherichia coli bacteremia. Her renal function was not recovered despite adequate duration of susceptible antibiotic treatment, accompanied by negative conversion of bacteremia and bacteriuria. Kidney biopsy revealed an infiltration of numerous histiocytes without Michaelis-Gutmann bodies. The patient's renal function was markedly improved after short-term treatment with high-dose steroid.
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Lee K, Park SJ, Kwon HJ, Kim IY, Yoo KH, Lee S, Park KM, On YK, Kim JS. Progressive Increase in Peridevice Leakage After the Implantation of the Watchman Device on Long-term Serial Echocardiographic Follow-up. Can J Cardiol 2014; 30:1461.e15-7. [DOI: 10.1016/j.cjca.2014.06.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Revised: 06/18/2014] [Accepted: 06/19/2014] [Indexed: 10/25/2022] Open
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Yoo KH, Lee JY, Lim SH, Ko YH, Kim SJ, Kim WS. Pilot trial of systemic methotrexate plus R-CHOP regimen with intrathecal methotrexate for simultaneous central nervous system and systemic diffuse large B cell lymphoma. Acta Haematol 2014; 133:179-82. [PMID: 25323539 DOI: 10.1159/000362149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 03/10/2014] [Indexed: 11/19/2022]
Abstract
BACKGROUND The simultaneous presentation of systemic diffuse large B cell lymphoma (DLBCL) with central nervous system (CNS) disease is not well controlled by either R-CHOP or systemic methotrexate (MTX) alone. METHODS We conducted a pilot trial with 6 patients who were initially diagnosed with systemic DLBCL with CNS involvement. Patients were treated with a systemic MTX plus R-CHOP regimen. RESULTS The overall response rate was 4/6 (66.7%). The CNS response rate and systemic response rate were 4/6 (66.7%) and 5/6 (83.3%), respectively. The median response duration of the 4 patients with complete remission at completion was 25.5 months, and the median survival of all patients was 25.1 months. CNS lesions progressed in all relapsed and refractory patients, while systemic disease progression was observed in 1 patient. No fatal hematologic adverse effects, hepatotoxicity or nephrotoxicity were observed. CONCLUSIONS The dose of systemic MTX (1∼1.5 g/m(2)) or dose intensity (4-week interval in 4 patients) used in this trial was considered insufficient. Therefore, the dose of MTX or interval of each chemotherapy cycle should be modified in future trials to control CNS disease involved with DLBCL.
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MESH Headings
- Aged
- Antibodies, Monoclonal, Murine-Derived/administration & dosage
- Antibodies, Monoclonal, Murine-Derived/adverse effects
- Antineoplastic Combined Chemotherapy Protocols/administration & dosage
- Antineoplastic Combined Chemotherapy Protocols/adverse effects
- Cyclophosphamide/administration & dosage
- Cyclophosphamide/adverse effects
- Disease-Free Survival
- Doxorubicin/administration & dosage
- Doxorubicin/adverse effects
- Female
- Follow-Up Studies
- Humans
- Lymphoma, Large B-Cell, Diffuse/drug therapy
- Lymphoma, Large B-Cell, Diffuse/mortality
- Lymphoma, Large B-Cell, Diffuse/pathology
- Male
- Methotrexate/administration & dosage
- Methotrexate/adverse effects
- Middle Aged
- Nervous System Diseases/drug therapy
- Nervous System Diseases/mortality
- Nervous System Diseases/pathology
- Pilot Projects
- Prednisone/administration & dosage
- Prednisone/adverse effects
- Rituximab
- Survival Rate
- Time Factors
- Vincristine/administration & dosage
- Vincristine/adverse effects
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Kwon TR, Yoo KH, Oh CT, Shin DH, Choi EJ, Jung SJ, Hong H, Choi YS, Kim BJ. Improved methods for selective cryolipolysis results in subcutaneous fat layer reduction in a porcine model. Skin Res Technol 2014; 21:192-200. [PMID: 25220194 DOI: 10.1111/srt.12176] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2014] [Indexed: 12/28/2022]
Abstract
BACKGROUND/AIMS Cryolipolysis is a noninvasive method for the selective reduction of localized fat tissues. It has demonstrated efficacy in both clinical and preclinical trials; however, despite its popularity, its mechanisms of action and evaluation methods are not yet fully defined. The purpose of this study was to improved methods for cryolipolysis using a porcine model. METHODS The abdomens of female PWG micro-pigs were treated with a cooling device (CRYOLIPO II(™)), and we examined the treatment effects using photography, three-dimensional photography, ultrasound, gross, and microscopic pathology, and serum lipid level analyses in order to determine the mechanism of action, efficacy, and safety of CRYOLIPO II(™). RESULTS CRYOLIPO II(™) successfully reduced abdominal fat in our porcine model. Gross and microscopic histological results confirmed the noninvasive cold-induced selective subcutaneous fat destruction, and showed increases in pre-adipocyte differentiation and in the activation of lipid catabolism. In particular, we found that CRYOLIPO II(™) may increase PPARδ (delta) levels in adipose tissue at 30-60 days post-treatment. CONCLUSION Fat reduction by cryolipolysis was successfully achieved in our porcine model. Thus, our findings indicate that CRYOLIPO II(™) may be a promising fat reduction device for body contouring and fat reduction in humans, and that cryolipolysis exerts its effects, at least partly, by targeting the PPARδ signaling pathway. These results show that both investigative and diagnostic potentials capacity.
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Park HJ, Park M, Han M, Nam BH, Koh KN, Im HJ, Lee JW, Chung NG, Cho B, Kim HK, Yoo KH, Koo HH, Kang HJ, Shin HY, Ahn HS, Lim YT, Kook H, Lyu CJ, Hah JO, Park JE, Lim YJ, Seo JJ. Efficacy and safety of micafungin for the prophylaxis of invasive fungal infection during neutropenia in children and adolescents undergoing allogeneic hematopoietic SCT. Bone Marrow Transplant 2014; 49:1212-6. [PMID: 25000455 DOI: 10.1038/bmt.2014.136] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 05/12/2014] [Accepted: 05/18/2014] [Indexed: 11/09/2022]
Abstract
The objective of this study was to evaluate the efficacy and safety of micafungin for the prevention of invasive fungal infection (IFI) during the neutropenic phase of allogeneic hematopoietic SCT (allo-HSCT) in children and adolescents. This was a prospective, multicenter, open-label, single-arm study. Micafungin was administered i.v. at a dose of 1 mg/kg/day (max 50 mg) from the beginning of conditioning until neutrophil engraftment. Treatment success was defined as the absence of proven, probable, possible or suspected IFI through to 4 weeks after therapy. From April 2010 to December 2011, 155 patients were enrolled from 11 institutions in Korea, and 147 patients were analyzed. Of the 147 patients, 121 (82.3%) completed the protocol without premature interruption. Of the 132 patients in whom micafungin efficacy could be evaluated, treatment success was achieved in 119 patients (90.2%). There was no proven fungal infection in any patient. The number of patients with probable, possible and suspected IFI was two, two and nine, respectively. Thirty-five patients (23.8%) experienced 109 adverse events (AEs) possibly related to micafungin. No patients experienced grade IV AEs. Two patients (1.4%) discontinued micafungin administration due to adverse effects. None of the deaths were related to the study drug.
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Park S, Jang JH, Jung CW, Kim WS, Kim SJ, Kim K, Lee J, Ahn MJ, Lee JY, Yoo KH, Lim SH. Evaluation of biochemichal features of anemia in cancer patients. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.e20698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Lee JY, Lim SH, Yoo KH, Kim M, Kim S, Jung HA, Sun JM, Kim SB, Park KU, Kim HK, Hong DS, Kim JS, Kim SG, Yi SY, Yun HJ, Hyun MS, Kim HJ, Park K, Ahn YC, Ahn MJ. Comparison of concurrent chemoradiation therapy with 3-weekly versus weekly cisplatin in patients with locally advanced nasopharyngeal cancer: A multicenter randomized phase II noninferiority trial (KCSG-HN10-02). J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.6023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Yoo KH, Kim ST, Lee J, Park SH, Kim SJ, Kim HS. The role of pazopanib in various histologic subtypes of metastatic soft tissue sarcomas. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.10586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Park BS, Abdel-Azeem AZ, Al-Sanea MM, Yoo KH, Tae JS, Lee SH. Staurosporine analogues from microbial and synthetic sources and their biological activities. Curr Med Chem 2014; 20:3872-902. [PMID: 23848535 DOI: 10.2174/09298673113209990176] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 06/03/2013] [Accepted: 07/05/2013] [Indexed: 11/22/2022]
Abstract
In 1977 an unknown natural product was isolated from Streptomyces staurosporeus by Omura et al. during a search for new alkaloids present in actinomycetes and was given the name AM-2282. Later, the structure of AM-2282 was elucidated by single crystal X-ray analysis and renamed as staurosporine. It has been published that staurosporine and its analogues display strong inhibitory effect against a variety of kinases and a number of biological properties such as antifungal, antibacterial, and immunosuppressive activities. Despite strong inhibitory activity of staurosporine, a very high level of cross-reactivity makes it impossible to use staurosporine as a therapeutic agent. In the course of searching for other staurosporine-related compounds, a number of staurosporine analogues have been isolated from different microorganisms. In addition, a number of staurosporine analogues have been synthesized to improve the poor selectivity and target specificity of staurosporine which limited its clinical effectiveness. The review addresses staurosporine analogues from both microbial and synthetic sources and their biological activities.
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Eom JE, Kim DS, Lee MW, Yu DK, Jin KS, Shin S, Lee SH, Sung KW, Koo HH, Yoo KH. Quality of functional haematopoietic stem/progenitor cells from cryopreserved human umbilical cord blood. Vox Sang 2014; 107:181-7. [PMID: 24517183 DOI: 10.1111/vox.12132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 01/02/2014] [Accepted: 01/03/2014] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVES Transplantation of cryopreserved umbilical cord blood (UCB) can be used to treat a multitude of haematologic and immunological diseases. In this study, we examined the quality of UCB cryopreserved for 2 (group I), 4 (group II) and 6 (group III) years. METHODS The following parameters and procedures were used to test individual units of cryopreserved UCB: the number of total nucleated cells (TNC), cell viability, CFU-GM assay, T-cell activation in vitro and haematopoietic stem cell engraftment in NOD/SCID mice in vivo. RESULTS The TNC recovery rates for groups I, II and III were 106·2 ± 6·17%, 96·69 ± 6·39% and 100·38 ± 5·27%, respectively, and the mean percentages of viable cells after thawing were 86·88%, 86·38% and 87·43%. When TNC were plated at 5 × 10(3), the number of CFU-GM was 13·6 (group I), 13·8 (group II), 14·2 (group III) and 14·7 (fresh UCB). We confirmed that the huCD4(+) and huCD8(+) T cells within cryopreserved UCB are functionally responsive by assessment of activated huCD25(+) cells. Moreover, the percentage of huCD45(+) cells in the bone marrow was 4·32 ± 1·29% (group I), 4·48 ± 1·11% (group II), 4·40% ± 1·12% (group III) and 4·50% ± 0·66% (fresh UCB), and that in the peripheral blood was 14·69 ± 3·08% (group I), 15·24 ± 4·05% (group II), 15·74 ± 3·43% (group III) and 17·48 ± 3·74% (fresh UCB) in NOD/SCID mice infused with isolated huCD34(+) cells. CONCLUSION These results indicated that cryopreserved UCB units efficiently retrieve in functionally competent form and are suitable for transplantation.
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Jeong HS, Kim SH, Lee KS, Jeong JM, Yoo TW, Kwon MS, Yoo KH, Kim TW. Optical properties of white organic light-emitting devices fabricated utilizing a mixed CaAl12O19:Mn4+ and Y3Al5O12:Ce3+ color conversion layer. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2013; 13:4394-4397. [PMID: 23862509 DOI: 10.1166/jnn.2013.7003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
White organic light-emitting devices (OLEDs) were fabricated by combining a blue OLED with a color conversion layer made of mixed Y3Al5O12:Ce3+ green and Ca2AlO19:Mn4+ red phosphors. The X-ray diffraction patterns showed that Ce3+ ions in the Y3Al5O12:Ce3+ phosphors completely substituted for the Y3+ ions and the Mn4+ ions in the CaAl12O19:Mn4+ phosphors completely substituted for the Ca2+ ions. Electroluminescence spectra at 11 V for the OLEDs fabricated utilizing a color conversion layer showed that the Commission Internationale de l'Eclairage coordinates for the Y3Al5O12:Ce3+ and CaAl12O19:Mn4+ phosphors mixed at the ratio of 1:5 and 1:10 were (0.31, 0.34) and (0.32, 0.37), respectively, indicative of a good white color.
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Kwon WJ, Kim SH, Lee KS, Choo DC, Kim SW, Kim SW, Yoo TW, Kwon MS, Yoo KH, Kim TW. Color stability of white organic light emitting devices with a color conversion layer utilizing CdSe/ZnS quantum dots and phosphors dispersed in polymethylmethacrylate. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2013; 13:4390-4393. [PMID: 23862508 DOI: 10.1166/jnn.2013.7002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
White organic light-emitting devices (WOLEDs) were fabricated by combining a blue emitting organic light-emitting devices (OLEDs) and a color conversion layer made of yttrium aluminum garnet phosphors and CdSe/ZnS quantum dots (QDs) embedded into polymethylmethacrylate. When the ratio of phosphors and QDs changed, a good color balance was achieved at a ratio of 1:5, and the maximum luminance of 18.21 cd/m2 was obtained. As the applied voltage varied from 12 to 16 V, Commission Internationale de l'Eclairage coordinates shifted only slightly from (0.32, 0.34) to (0.30, 0.33), indicating a good color stability.
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Rhee CK, Yoo KH, Lee JH, Park MJ, Kim WJ, Park YB, Hwang YI, Kim YS, Jung JY, Moon JY, Rhee YK, Park HK, Lim JH, Park HY, Lee SW, Kim YH, Lee SH, Yoon HK, Kim JW, Kim JS, Kim YK, Oh YM, Lee SD, Kim HJ. Clinical characteristics of patients with tuberculosis-destroyed lung. Int J Tuberc Lung Dis 2013; 17:67-75. [PMID: 23232006 DOI: 10.5588/ijtld.12.0351] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING Multicentre study. OBJECTIVE To define the clinical characteristics of patients with tuberculosis (TB) destroyed lung due to past TB. DESIGN We reviewed patients with TB-destroyed lung between May 2005 and June 2011. RESULTS A total of 595 patients from 21 hospitals were enrolled. The mean age was 65.63 ± 0.47 (mean ± standard error); 60.5% were male. The mean number of lobes involved was 2.59 ± 0.05. Pleural thickening was observed in 54.1% of the patients. Mean forced vital capacity (FVC), forced expiratory volume in 1 s (FEV(1)), FEV(1)/FVC, bronchodilator response and number of exacerbations per year were respectively 2.06 ± 0.03 l (61.26% ± 0.79), 1.16 ± 0.02 l (49.05% ± 0.84), 58.03% ± 0.70, 5.70% ± 0.34, and 0.40 ± 0.04. The number of lobes involved was significantly correlated with FVC and FEV(1), and with the number of exacerbations per year. Use of long-acting muscarinic antagonists or long-acting beta-2 agonists plus inhaled corticosteroids resulted in bronchodilatory effects. Multivariable regression analysis showed that age, initial FEV(1) (%) and number of exacerbations during follow-up were independent factors affecting change in FEV(1). CONCLUSION Decreased lung function with exacerbation, and progressive decline of FEV(1) were observed in patients with TB-destroyed lung.
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Lee SH, Lee MW, Yoo KH, Kim DS, Son MH, Sung KW, Cheuh H, Choi SJ, Oh W, Yang YS, Koo HH. Co-transplantation of third-party umbilical cord blood-derived MSCs promotes engraftment in children undergoing unrelated umbilical cord blood transplantation. Bone Marrow Transplant 2013; 48:1040-5. [DOI: 10.1038/bmt.2013.7] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 01/05/2013] [Accepted: 01/10/2013] [Indexed: 12/11/2022]
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Kim DH, You JH, Kim JH, Yoo KH, Kim TW. Electronic structures and carrier distributions of T-shaped AlxGa1-xAs/AlyGa1-yAs quantum wires fabricated by a cleaved-edge overgrowth method. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:5687-5690. [PMID: 22966634 DOI: 10.1166/jnn.2012.6391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The electronic structures and carrier distributions of T-shaped AlxGa1_xAs/AlyGa1-yAs quantum wire (QWR) consisting of crossed arm and stem wells were numerically calculated by using a finite-difference method (FDM). The electronic subband energies in the arm and the stem wells were numerically calculated by using the FDM taking into account two-band Hamiltonian systems considering with and without strain and nonparabolicity effects. The band deformation due to strain and the probabilistic electron confinement of T-shaped AlxGa1-xAs/AlyGa1-yAs QWRs were also calculated. The transition energy from the ground heavy-hole state (HH1) to the ground electron state (E1) was 1.584 eV when the strain was not considered and 1.585 eV when the strain effects were included. The excitonic peak energies corresponding to the interband transitions (E1-HH1) in the T-shaped QWRs determined from the photoluminescence spectra were compared favorably with those determined from the FDM calculations.
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You JH, Kim DH, Lee DU, Yoo KH, Park CY, Park KW, Jang SJ, Lee YT, Kim TW. Effect of temperature on optical and electronic properties of InGaP/InGaAIP multiple quantum wells. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:5843-5846. [PMID: 22966667 DOI: 10.1166/jnn.2012.6246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The optical and electronic properties in an InGaP/InGaAIP multiple quantum well (MQW) grown by using molecular-beam epitaxy utilizing the digital alloy technique were investigated through temperature-dependent photoluminescence (PL) measurements and numerical calculations. The high-resolution transmission electron microscopy images showed that the sample clearly displayed the InGaP wells and the InGaAIP barriers and separate confinement heterostructure layers. The PL measurements at various temperatures were performed to investigate the interband transitions of the InGaP/InGaAIP MQW. The electronic subband energies and the wavefunctions in the InGaP/InGaAIP MQW at several temperatures were determined by using a finite element method employing the standard 8-band k x p Lagrangian. The numerical results for optical interband transition energies from the ground state electron subband to the ground state heavy-hole subband of the InGaP/InGaAIP MQW at various temperatures were in reasonable agreement with the excitonic transition energies observed in the PL measurements.
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Sung KW, Son MH, Lee SH, Yoo KH, Koo HH, Kim JY, Cho EJ, Lee SK, Choi YS, Lim DH, Kim JS, Kim DW. Tandem high-dose chemotherapy and autologous stem cell transplantation in patients with high-risk neuroblastoma: Results of SMC NB-2004 study. Bone Marrow Transplant 2012; 48:68-73. [DOI: 10.1038/bmt.2012.86] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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70
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Yim YS, Noh YH, Kim DH, Lee MW, Cheuh HW, Lee SH, Yoo KH, Jung HL, Sung KW, Choi SJ, Oh WI, Yang YS, Koo HH. Correlation between the immature characteristics of umbilical cord blood-derived mesenchymal stem cells and engraftment of hematopoietic stem cells in NOD/SCID mice. Transplant Proc 2011; 42:2753-8. [PMID: 20832581 DOI: 10.1016/j.transproceed.2010.05.146] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 02/09/2010] [Accepted: 05/12/2010] [Indexed: 12/26/2022]
Abstract
Umbilical cord blood (UCB)-derived mesenchymal stem cells (MSC) facilitate the engraftment of human (h) hematopoietic stem cells when transplanted simultaneously in animal and human studies. However, the type of MSCs that preferentially enhance the engraftment of HSCs is unknown. Recent studies have shown that MSCs derived from a single source are heterogeneous in terms of cell size, morphology, proliferation rate, and differentiation potential. This study was designed to investigate the properties of UCB-MSCs, which influence the engraftment of hHSCs in a NOD/SCID mouse model. We categorized MSCs as being the most effective (UCB-352 MSCs) or the least effective (UCB-156 MSCs) at promoting the homing and engraftment of HSCs, and compared the characteristics of these 2 MSC populations. We observed that the 2 populations showed differences in characteristics typical of immature MSCs, and related to proliferation potential. We showed that UCB-352 MSCs, which proliferate quickly, preferentially enhanced the engraftment of HSCs in NOD/SCID mice. In addition, we observed differences in the pattern of both PODXL and Oct4 expression, and in the levels of cytokines such as SDF-1 and SCF using flow cytometry and membrane arrays. The more effective UCB-352 MSCs expressed higher levels of PODXL and Oct4, which were associated with immaturity, than did the UCB-156 MSCs. Furthermore, UCB-352 cells secreted greater levels of SDF-1 and SCF, both of which are required for hematopoiesis. We propose that the proliferation potential of UCB-MSCs, coupled with their immature characteristics, may serve as a novel standard to promote the homing and engraftment of HSCs.
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Lee SH, Cheuh H, Yoo KH, Kim YJ, Sung KW, Koo HH, Kim DH, Kim SJ, Kim K, Jang JH, Jung CW. Hematopoietic stem cell transplantation from a related donor infected with influenza H1N1 2009. Transpl Infect Dis 2011; 13:548-50. [PMID: 21348910 DOI: 10.1111/j.1399-3062.2011.00616.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rho YK, Yoo KH, Kim BJ, Kim MN, Song KY. A case of generalized fixed drug eruption due to a piroxicam plaster. Clin Exp Dermatol 2010; 35:204-5. [PMID: 20447085 DOI: 10.1111/j.1365-2230.2009.03394.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Yoo KH, Seo SJ, Park J, Han TY, Li K, Song KY, Hong CK. Extramammary Paget's disease of the penis with features of Bowen's disease. Clin Exp Dermatol 2010; 34:e999-1000. [PMID: 20055883 DOI: 10.1111/j.1365-2230.2009.03659.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yim HE, Kim JH, Yoo KH, Bae IS, Jang GY, Hong YS, Lee JW. Spironolactone, but not enalapril, potentiates hypoxia-inducible factor-1 alpha and Ets-1 expression in newborn rat kidney. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2010; 61:73-81. [PMID: 20228418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 01/12/2010] [Indexed: 05/28/2023]
Abstract
Hypoxia is regarded as an important physiological factor that controls nephrogenesis. We investigated whether the renin-angiotensin-aldosterone system (RAAS) affects hypoxia-related target genes in developing kidneys. Newborn rat pups were treated with enalapril (30 mg/kg/d) or spironolactone (200 mg/kg/d) for 7 days. Tissue hypoxia was assessed by the uptake of a hypoxyprobe-1, pimonidazole (200 mg/kg), and the expression of hypoxia-responsive genes. In the enalapril group, hypoxia-inducible factor (HIF)-1alpha, HIF-2alpha, and Ets-1 protein expression were not changed, compared to the control group. In the spironolactone group, HIF-1alpha and Ets-1 protein expression were significantly increased by immunoblots and immunohistochemistry, whereas HIF-2alpha protein expression was not changed, compared to the control group. In the enalapril group, the immunoactivity of pimonidazole was not significantly different from that of the controls. However, in the spironolactone group, pimonidazole staining demonstrated that the cortex and medulla underwent severe hypoxia. In summary, our data showed that aldosterone inhibition in the developing kidney augmented the hypoxic responses, and up-regulated the expression of key mediators of hypoxia including HIF-1alpha and Ets-1. Angiotensin II inhibition did not affect hypoxia-related alterations in the developing kidney. The components of RAAS may differentially modulate renal hypoxia and its related target genes in the developing rat kidney.
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Lee SH, Yoo KH, Sung KW, Koo HH, Kwon YJ, Kwon MM, Park HJ, Park BK, Kim YY, Park JA, Im HJ, Seo JJ, Kang HJ, Shin HY, Ahn HS. Hepatic veno-occlusive disease in children after hematopoietic stem cell transplantation: incidence, risk factors, and outcome. Bone Marrow Transplant 2009; 45:1287-93. [PMID: 20010866 DOI: 10.1038/bmt.2009.349] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Four hundred and sixty-seven hematopoietic stem cell transplantations (HSCTs) (217 autologous and 250 allogeneic HSCT) were performed in 374 children at four pediatric HSCT centers in Korea from January 2005 to December 2007. Among 467 transplants, veno-occlusive disease (VOD) developed in 72 transplants (15.4%) at a median of 10 days after HSCT. Multivariate analysis showed that BU or TBI-containing regimen (P=0.002), VOD prophylaxis without lipo-prostaglandin E1 (PGE1) (P=0.012), number of previous HSCT (P=0.014), and pretransplant serum ferritin (P=0.018) were independent risk factors for developing VOD. Mean serum ferritin levels were significantly higher in HSCT with VOD (2109.6+/-2842.5 ng/ml) than in HSCT without VOD (1315.9+/-1094.4 ng/ml) (P<0.001). The relative risk of death within 100 days of HSCT in transplants with VOD compared with transplants without VOD was 3.39 (confidence interval: 1.78-6.45). Our results suggest that lipo-PGE1 might have a protective effect against the development of VOD, and pretransplant serum ferritin could act as a risk factor for VOD. A larger prospective study is needed to confirm a possible role of lipo-PGE1 and iron chelation therapy in reducing the incidence of VOD.
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