H-J Lee

Kyungpook National University Hospital, Sŏul, Seoul, South Korea

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Publications (28)104.33 Total impact

  • H-J Lee · P-T Kim · I-H Jeon · H-S Kyung · I-H Ra · T-K Kim

    No preview · Article · Oct 2014 · Journal of Hand Surgery (European Volume)
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    ABSTRACT: Although gradual bone transport may permit the restoration of large-diameter bones, complications are common owing to the long duration of external fixation. In order to reduce such complications, a new technique of bone transport involving the use of an external fixator and a locking plate was devised for segmental tibial bone defects. A total of ten patients (nine men, one woman) with a mean age at operation of 40.4 years (16 to 64) underwent distraction osteogenesis with a locking plate to treat previously infected post-traumatic segmental tibial defects. The locking plate was fixed percutaneously to bridge proximal and distal segments, and was followed by external fixation. After docking, percutaneous screws were fixed at the transported segment through plate holes. At the same time, bone grafting was performed at the docking site with the external fixator removed. The mean defect size was 5.9 cm (3.8 to 9.3) and mean external fixation index was 13.4 days/cm (11.8 to 19.5). In all cases, primary union of the docking site and distraction callus was achieved, with an excellent bony result. There was no recurrence of deep infection or osteomyelitis, and with the exception of one patient with a pre-existing peroneal nerve injury, all achieved an excellent or good functional result. With short external fixation times and low complication rates, bone transport with a locking plate could be recommended for patients with segmental tibial defects. Cite this article: Bone Joint J 2013;95-B:1667-72.
    Full-text · Article · Dec 2013 · Bone and Joint Journal
  • H-J Lee · P-T Kim · I-H Jeon · H-S Kyung · I-H Ra · T-K Kim
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    ABSTRACT: Osteophyte excision is a mainstay of treatment for mucous cyst combined with Heberden's node in a distal interphalangeal joint or in an interphalangeal joint of the thumb. The aim of this study was to evaluate the results of osteophyte excision without cyst excision for the treatment of a mucous cyst combined with Heberden's node. The medical records of 37 patients (42 cases) with a mucous cyst with Heberden's node were retrospectively reviewed. Thirty-eight of 40 cases with available pre-operative simple radiographs showed evidence of joint arthrosis. A T-shaped skin incision of the joint capsule between the extensor tendon and lateral collateral ligament was used. Osteophyte excision without cyst excision was performed. All cysts, except one, regressed without recurrence or a skin complication after osteophyte excision, but eight cases showed post-operative pain and loss of range of motion. Osteophyte excision without cyst excision may be a good treatment choice for mucous cyst of the finger.
    No preview · Article · Mar 2013
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    H S Ahn · Y S Shin · P J Park · K N Kang · Y Kim · H-J Lee · H-K Yang · C W Kim
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    ABSTRACT: Currently, serum biomarkers, which are sufficiently sensitive and specific for early detection and risk classification of gastric adenocarcinoma do not exist. Therefore, this study identified a panel of serum biomarkers for the diagnosis of gastric adenocarcinoma. A 29-plex array platform with 29 biomarkers, consisting of 11 proteins discovered through proteomics and 18 previously known to be cancer-associated, was constructed. A test/training set consisting of 120 gastric adenocarcinoma and 120 control samples were examined. After 13 proteins were selected as candidate biomarkers, multivariate classification analyses were used to identify algorithms for diagnostic biomarker combinations. These algorithms were independently validated using a set of 95 gastric adenocarcinoma and 51 control samples. Epidermal growth factor receptor (EGFR), pro-apolipoprotein A1 (proApoA1), apolipoprotein A1, transthyretin (TTR), regulated upon activation, normally T-expressed and presumably secreted (RANTES), D-dimer, vitronectin (VN), interleukin-6, α-2 macroglobulin, C-reactive protein and plasminogen activator inhibitor-1 were selected as classifiers in the two algorithms. These algorithms differentiated between the majority of gastric adenocarcinoma and control serum samples in the training/test set with high accuracy (>88%). These algorithms also accurately classified in the validation set (>85%). Two panels of combinatorial biomarkers, including EGFR, TTR, RANTES, and VN, are developed, which are less invasive method for the diagnosis of gastric adenocarcinoma. They could supplement clinical gastroscopic evaluation of symptomatic patients to enhance diagnostic accuracy.
    Preview · Article · Feb 2012 · British Journal of Cancer
  • H S Ahn · H-J Lee · M-W Yoo · S-H Jeong · D-J Park · H-H Kim · W H Kim · K U Lee · H-K Yang
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    ABSTRACT: The pattern of gastric cancer in the Western world is changing, with an increased proportion of tumours in the upper stomach. The aim of this study was to investigate changes in clinicopathological features and survival of patients with resected gastric cancer at a single institution, in an area of high incidence in the Far East. Clinical features and pathological findings were compared in patients with gastric cancer who underwent gastrectomy at Seoul National University Hospital during four consecutive periods (1986-1990, 1991-1995, 1996-2000 and 2001-2006). There were 12 026 patients. The mean age increased from 53·4 years in the first period to 57·4 years in the last (P < 0·001). The proportion of patients aged 70 years or older also increased, reaching 16·1 per cent in the final period. Upper-third cancer increased from 5·3 per cent in the first period to 14·0 per cent in the fourth (P < 0·001). Early gastric cancer (pathological T1) increased continuously over the four time intervals, from 24·8 to 48·9 per cent (P < 0·001). The overall 5-year survival rate increased from 64·0 per cent in the first period to 73·2 per cent at the end (P < 0·001), and this survival improvement was apparent in patients aged 40 years or more. The mean age of patients with gastric cancer has increased during the past 20 years. The proportion of early gastric cancer and overall survival have gradually increased, especially in patients aged over 40 years.
    No preview · Article · Feb 2011 · British Journal of Surgery
  • S-H Kong · M-W Yoo · J-W Kim · H-J Lee · W H Kim · K U Lee · H-K Yang
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    ABSTRACT: This study aimed to determine the appropriate extent of lymph node (LN) dissection in gastric cancer by analysing LN metastasis patterns from prospectively collected topographical data on nodal status at Seoul National University Hospital, Korea. The metastasis rate for each LN station was analysed according to the depth of tumour invasion in patients with primary lower-third gastric cancer who underwent curative gastrectomy. The Maruyama Index of unresected disease (MI) was calculated using the WinEstimate(®) program with simulation of various extents of LN dissection. LN metastasis in mucosal cancer was rare; 2·6 per cent of patients had a MI of more than 5 with simulation of D1 plus station 7 dissection, whereas 0·9 per cent had a MI above 5 with D1 plus stations 7 and 8a. In submucosal cancer, 3·3 per cent of tumours metastasized to level 2 LN stations outside the range of D1 plus stations 7, 8a and 9. The proportion of patients with a MI above 5 was 9·0 per cent with D1 plus stations 7, 8a and 9 dissection. The nodal metastasis rate was higher at level 1 and 2 for muscularis propria or deeper cancers. D1 dissection plus stations 7 and 8a for mucosal cancer, and D2 dissection for cancers of the muscularis propria or deeper seems appropriate. For submucosal cancer, an expanded dissection to the D2 level should be considered to ensure complete removal of metastatic LNs.
    No preview · Article · Jan 2011 · British Journal of Surgery
  • H-J Lee · G-S Jeong · S-H Pi · S-I Lee · W-J Bae · S-J Kim · S-K Lee · E-C Kim
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    ABSTRACT: Although substance P (SP) stimulates bone resorption activity and this is reported to be correlated with the degree of periodontal inflammation, it is unclear how human periodontal ligament cells regulate neuropeptide-induced osteoclastogenesis or the possible involvement of heme oxygenase-1 (HO-1) might be. This study examines how SP affects osteoprotegerin (OPG) and RANKL expression via HO-1. Using immortalized human periodontal ligament cells, the effects of SP on the expression of HO-1, RANKL and OPG mRNA and proteins were determined by RT-PCR and western blotting, respectively. Various concentrations of SP (10(-7), 10(-8), 10(-9) and 10(-10) m) were added to the medium, and the cells were treated for 0, 0.25, 0.5, 1, 2 and 3 d. Substance P upregulated RANKL and HO-1 and downregulated OPG mRNA and protein expression in periodontal ligament cells, in a concentration- and time-dependent manner. A HO-1 inducer inhibited both the upregulation of RANKL expression and downregulation of OPG expression by SP in periodontal ligament cells. By contrast, treatment with a HO-1 inhibitor or HO-1 small interferring RNA (siRNA) enhanced SP-stimulated RANKL expression. Inhibitors of ERK and p38 MAP kinases, phosphoinositide 3-kinase and nuclear factor-kappaB blocked the effects of SP on RANKL expression in periodontal ligament cells. These results suggest that SP stimulates osteoclastic differentiation by increasing the expression of RANKL vs. OPG via the HO-1 pathway in periodontal ligament cells. The HO-1 pathway may be an effective therapeutic target for inhibiting chronic periodontitis involving alveolar bone resorption.
    No preview · Article · Mar 2010 · Journal of Periodontal Research
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    ABSTRACT: In a candidate gene association study, we found that the variations of calcitonin receptor (CALCR) gene were related to the risk of vertebral fracture and increased bone mineral density (BMD). Calcitonins through calcitonin receptors inhibit osteoclast-mediated bone resorption and modulate calcium ion excretion by the kidney and also prevent vertebral bone loss in early menopause. To identify genetically susceptible factors of osteoporosis, we discovered the variations in CALCR gene, genotyped in Korean postmenopausal women (n = 729), and examined the potential involvement of seven single-nucleotide polymorphism (SNPs) and their haplotypes in linkage disequilibrium block (BL_hts). The SNPs, +43147G > C (intron 7), +60644C > T (exon13, 3' untranslated region), and their haplotypes, BL2_ht1 and BL2_ht2, showed a significant association with risk of vertebral fracture (p = 0.048-0.004) and BL2_ht1 showed a highly significant protective effect. Moreover, the polymorphism +60644C > T showed a highly significant association with BMD at both lumbar spine and femoral neck. The subjects carrying CC and CT genotypes with the SNP, +60644C > T, had higher BMD values at the lumbar spine (p = 0.01-0.001) and femoral neck (p = 0.025-0.009). These results indicate that the CALCR gene may regulate bone metabolism, and +60644C > T in the CALCR gene may genetically modulate bone phenotype.
    No preview · Article · Nov 2009 · Osteoporosis International
  • YS Jee · S-H Hwang · J Rao · D J Park · H-H Kim · H-J Lee · H-K Yang · K U Lee
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    ABSTRACT: Endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) are widely performed. Indications for these procedures have been extended in Korea and Japan. The aim was to evaluate whether these extended indications are safe. All patients who had surgery for early gastric cancer at Seoul National University Bundang Hospital between May 2003 and December 2007 were identified from a prospective database. Lymph node status was examined in patients who met extended indications for EMR and had undergone surgical resection. Of patients with mucosal cancers, 129 met extended indications for EMR or ESD and three (2.3 per cent) had lymph node metastasis. Of the 52 submucosal cancers meeting extended indications for EMR or ESD, two (4 per cent) had lymph node metastasis. Differentiated mucosal cancers without ulcer formation did not have lymph node metastasis, irrespective of size. Extending the indications for EMR and ESD according to the Japanese Gastric Cancer Association guidelines carries an increased risk of lymph node metastasis. For cancers meeting these criteria, treatment by gastric resection with lymph node dissection should still be considered. A well differentiated mucosal cancer of any size without ulceration may be considered as an extended indication for EMR or ESD.
    No preview · Article · Oct 2009 · British Journal of Surgery
  • T-J Kim · K-S Na · H-J Lee · B Lee · T-H Kim
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    ABSTRACT: There is an established association between the development of ankylosing spondylitis (AS) and the HLA-B27 allele, but whether or not homozygosity for HLA B27 has any additional effects on the clinical manifestations of AS is unclear. The aim of this study was to determine the influence of HLA-B27 homozygosity on the clinical manifestations of AS in Korea. A total of 490 patients were enrolled in this study. Genotyping was carried out using polymerase chain reaction-sequence specific primers (PCR-SSP) to assess HLA-B27 homozygosity or heterozygosity. One PCR reaction was undertaken to determine the HLA-B27 carrier status, and 5 group-specific PCR reactions were carried out to determine all of the other HLA-B alleles. Clinical manifestations of AS and BASFI were also evaluated according to homozygosity or heterozygosity for HLA-B27. HLA-B27 positive patients had a significantly younger age at symptom onset, more uveitis, and a higher frequency of hip joint involvement than HLA-B27 negative patients. One hundred and forty-six (29.8%) patients were homozygous for HLA-B27. No significant association between HLA-B27 homozygosity or heterozygosity and a history of peripheral arthritis, acute anterior uveitis, age at onset, or the Bath Ankylosing Spondylitis Functional Index (BASFI) was found. Homozygosity for HLA-B27 does not affect the clinical manifestations of AS in Korean patients.
    No preview · Article · Jul 2009 · Clinical and experimental rheumatology
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    H-S Lee · J-H Park · J-Y Lee · J-Y Kim · N-H Sung · T-Y Koo · B K Cho · C-U Jung · S Saini · S-J Kim · H-J Lee
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    ABSTRACT: Fluorine-free SmFeAsO1−x single crystals of a nominal composition with x = 0.15 were grown under the pressure of 3.3 GPa and at 1350–1450 °C by using the self-flux method. Plate-shaped crystals of a few–200 µm in lateral size were obtained. The resistively determined superconducting transition of a single crystal was at about 53.5 K, with a narrow resistive transition width of 0.5 K. The detailed crystal structure was analyzed by using synchrotron-irradiated x-ray diffractometry and high-resolution scanning transmission electron microscopy. A sharp transition, a low residual resistivity, and a large residual resistivity ratio indicate the high quality of our single crystals. The temperature and magnetic field dependences of the magnetization also confirmed the absence of extrinsic impurity phases.
    Preview · Article · Jun 2009 · Superconductor Science and Technology
  • J-W Ha · D Choi · S Park · C-Y Shim · J-M Kim · S-H Moon · H-J Lee · E-Y Choi · N Chung
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    ABSTRACT: Pulmonary hypertension (PH) can occur during exercise and has an adverse effect on functional status, exercise tolerance and prognosis. However, the role of cardiac function abnormalities on exercise-induced PH in patients with normal left ventricular ejection fraction (LVEF) is unclear. To analyse exercise-induced PH determinants in patients with normal LVEF. 396 subjects (160 male, mean age 55 (SD 13)) referred for exercise echocardiography underwent a graded, symptom-limited, supine bicycle exercise with two-dimensional and Doppler echocardiography. Tricuspid regurgitation (TR) velocity was measured at rest and during exercise. Pulmonary artery systolic pressure (PASP) was estimated from TR velocity by adding a right atrial pressure of 10 mm Hg. Patients were classified according to exercise induced PH, defined as present if PASP >50 mm Hg at 50 W of exercise. 135 patients (34%) had PASP >50 mm Hg during exercise. Patients with exercise-induced PH were older, more commonly female and had shorter exercise duration; however, LVEF was significantly higher. The systolic blood pressure at rest and during exercise was significantly higher in patients with exercise-induced PH (rest, 125 (18) vs 132 (18) mm Hg, p = 0.0003; 25 W, 146 (21) vs 157 (21) mm Hg, p<0.0001; 50 W, 157 (24) vs 170 (22) mm Hg, p<0.0001; 75 W, 168 (23) vs 183 (22) mm Hg, p<0.0001). Despite similar resting oxygen saturation, exercise oxygen saturation was significantly lower in subjects with exercise-induced PH than in those without. Numerous echocardiographic variables were significantly different between groups. In multivariate analysis, resting TR velocity (p<0.0001), E/E' (p = 0.027), age and gender were the strongest predictors of PASP during exercise. Exercise-induced PH is common even in subjects with normal LVEF. It is strongly associated with E/E' ratio, TR velocity, age, systolic blood pressure during exercise and gender.
    No preview · Article · Mar 2009 · Heart (British Cardiac Society)
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    H-J Lee · S-J Choi · J M Hong · W K Lee · J-I Baek · S-Y Kim · E K Park · T-H Kim · U-K Kim
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    ABSTRACT: Reduction or disruption of the blood supply to the bone is involved in the pathogenesis of osteonecrosis of the femoral head (ONFH). An altered lipid metabolism is one of the major risk factors for ONFH. Sterol regulatory element binding protein, SREBF1 activates genes regulating lipid biosynthesis. The aim of this study was to examine the association between the polymorphisms of the SREBF1 gene and ONFH susceptibility in the Korean population. The SREBF1 gene in 24 unrelated Korean individuals was sequenced and two polymorphisms were detected. Two variants, IVS6 - 48 C > T and IVS7 + 117 A > G, were genotyped in 423 ONFH patients and 348 controls. The genotype frequency of IVS7 + 117 A > G in ONFH patients was significantly different from that of the control group with P value < 0.0001 (Adjusted OR; 6.88, 95% CI; 3.74-12.67). Moreover, the IVS7 + 117 A > G genotype showed an association with men, and further analysis stratified by etiological factors indicated that the genotype data was significantly associated with a high risk for patients with alcohol-induced ONFH (P < 0.0001). We found that the IVS7 + 117 A > G polymorphism of the SREBF1 gene is associated with an increased risk of ONFH in the Korean population.
    Preview · Article · Dec 2008 · Annals of Human Genetics
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    ABSTRACT: To understand patients' perceptions of clinical trials (CTs) is the principal step in the enrollment of patients to CTs. However, these perceptions in eastern countries are very rare. From 12 February 2007 to 13 April 2007, we consecutively distributed the questionnaire to 842 cancer patients who initiated a first cycle of chemotherapy regardless of each treatment step in the Seoul National University Hospital. Younger age, higher educational degree, higher economic status, and possession of private cancer insurance were related with significantly higher awareness of CTs (P=0.001, P=0.006, P=0.002, and P=0.009, respectively). However, unlike awareness, perceptions on benefits of CTs were not changed according to age, educational degree, and economic status (P=0.709, P=0.920, and P=0.847, respectively). Willingness was also not changed according to age, educational degree, economic status, and private cancer insurance (P=0.381, P=0.775, P=0.887, and P=0.392, respectively). Instead, males and heavily treated patients had more positive perceptions on benefits (P=0.002 and P=0.001, respectively) and more willingness to participate in CTs (OR=1.17, 1.14-2.75: OR=1.59, 1.01-2.51, respectively). In summary, cancer patients' awareness of CTs, perceptions on the benefit in CTs, and willingness to participate are differently influenced by diverse medical and social conditions. This information would be very helpful for investigators to properly conduct CTs in eastern cancer patients.
    Preview · Article · Dec 2008 · British Journal of Cancer
  • J Lee · S-K Lee · B-U Lee · H-J Lee · N-P Cho · J-H Yoon · H-R Choi · E-C Kim
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    ABSTRACT: The expression of heme oxygenase-1 (HO-1), stress-related enzyme, is induced in leukaemia and some cancer tissues, but relatively little is known about the differential pattern of HO-1 expression and proliferation in premalignant lesions of the epithelial oral mucosa. The purpose of this study was to evaluate whether HO-1 expression and proliferation were increased in preneoplastic lesions compared to normal and oral cancer tissues. Immunohistochemical staining was used to examine the expression patterns of HO-1 and proliferating cell nuclear antigen (PCNA) in a series of normal mucosa and mild-to-severe cases of oral epithelial dysplasia (OED) and oral squamous cell carcinoma. Both HO-1 and PCNA are expressed in the basal cells of normal oral mucosa. In patients with OED and carcinoma in situ, immunostaining for PCNA and HO-1 was more intense, and gradually extended into the superficial layers of the mucosa. HO-1 and PCNA expression was correlated with the degree of epithelial dysplasia. Oral squamous cell carcinoma also showed elevated expression of HO-1, but this level was not higher than in severe OED or carcinoma in situ. These results suggest that the up-regulation of HO-1 in premalignant oral lesions is part of an early cytoprotection mechanism against carcinogenesis in the oral mucosa.
    No preview · Article · Apr 2008 · International Journal of Oral and Maxillofacial Surgery
  • Y-M Park · J-H Cho · S-G Kang · J-E Choi · S-H Lee · L Kim · H-J Lee
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    ABSTRACT: Weight gain can be an adverse effect of antipsychotics that significantly affects long-term health and treatment compliance. Many reports have suggested that the 5-HT2C receptor gene (HTR2C) is related to appetite and eating behaviours associated with body weight change. We hypothesized that there was a relationship between the HTR2C -759C/T polymorphism and olanzapine-induced weight gain. Seventy-nine Korean schizophrenic patients were examined. Their weight was measured before starting olanzapine and after long-term treatment for at least 3 months. We controlled the use of drugs other than olanzapine except benzodiazepines and anticholinergics. Genotyping for the HTR2C -759C/T polymorphism was performed on all participants. We found that long-term treatment with olanzapine resulted in mean gains in weight and BMI of 5.2 kg and 1.93 kg/m(2), respectively. However, body weight changes from baseline to the study endpoint were not significantly associated with genotypes. The frequency of the T allele did not differ significantly between subjects with weight gains below and above a clinically significant cutoff, defined as 7% relative to baseline (chi(2) = 0.213, P = 0.445), indicating that the T allele had no protective effect against olanzapine-induced weight gain. The findings from this study do not support the presence of a relationship between the -759C/T polymorphism of the HTR2C gene and weight gain in Korean schizophrenic patients receiving olanzapine treatment.
    No preview · Article · Mar 2008 · Journal of Clinical Pharmacy and Therapeutics
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    M-H Park · K-S Kim · H-J Lee · Y-M Cho · H-K Lee · K-S Park · D-J Shin · Y Jang · K-J Kim · J Jung · H-L Kim · B Oh · J-Y Lee
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    ABSTRACT: Microsatellite markers are an essential tool for genetic linkage analysis because of their high polymorphism content. Four hundred commercially available markers covering the entire genome were genotyped from 578 sib individuals from 249 Korean families. Allelic frequencies and heterozygosities were determined for each marker loci and compared between Korean, Taiwanese, Japanese and Caucasian populations. In the three Asian populations, 10-13% of the markers had less than 0.6 heterozygosity, whereas in the Caucasian population, only 0.5% of the markers had less than 0.6 heterozygosity. Mean identical by descent (IBD) values were calculated for 578 sib individuals. Analysis of IBD values greater than 0.5 suggested that markers with low heterozygosity can also provide positive linkages, at least for the IBD sharing method of model-free linkage analysis. The data presented in this study will be a useful reference for genome-wide screens of Koreans and comparative studies with other ethnic populations.
    Full-text · Article · Feb 2008 · Journal of Human Genetics
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    S-U Han · T-H Kwak · K.H. Her · Y-H Cho · C Choi · H-J Lee · S Hong · Y.S. Park · Y-S Kim · T-A Kim · S-J Kim
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    ABSTRACT: The carcinoembryonic antigen (CEAs) family consists of a large group of evolutionarily and structurally divergent glycoproteins. The transforming growth factor-beta (TGF-beta) signaling pathway has been implicated in the stimulation of CEA secretion in TGF-beta-sensitive colon cells, thereby possibly modulating cell adhesion and differentiation. However, the specific CEAs targeted by TGF-beta signaling or underlying mechanism of the expression of CEAs has not yet been clarified. In this study, we investigated the specific CEAs targeted by the TGF-beta signaling pathway. In nine human gastric cancer cell lines examined, TGF-beta-responsive cell lines showed positive expression of CEAs. Expression patterns of CEA proteins correlated well with the level of CEA (CEACAM5) and CEACAM6 transcripts in these cell lines, but CEACAM1 expression was not observed in all of these cells. To investigate the role of TGF-beta signaling in CEA expression, we selected two TGF-beta unresponsive gastric cancer cell lines; SNU638 cells that contain a mutation in the TGF-beta type II receptor and SNU484 cells that express low to undetectable level of the TGF-beta pathway intermediate protein, Smad3. Restoration of TGF-beta signaling in these cells induced expression of the CEAs and increased activity of both CEA (CEACAM5) and CEACAM6 promoters. CEA expression was observed in the epithelium of the stomach of wild-type mice, but was markedly decreased in Smad3 null mice. These findings suggest that CEA (CEACAM5) and CEACAM6 are major target genes for Smad3-mediated TGF-beta signaling.
    Preview · Article · Jan 2008 · Oncogene
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    S-K Lee · S-H Pi · S-H Kim · K-S Min · H-J Lee · H-S Chang · K-H Kang · H-R Kim · H-I Shin · E-C Kim
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    ABSTRACT: Although substance P (SP), a potent proinflammatory peptide, is involved in inflammation and immune responses, the effect of SP on the expression of macrophage inflammatory protein 3alpha[MIP-3alpha, chemokine C-C ligand 20 (CCL20)] in periodontal ligament (PDL) cells is unknown. Equally enigmatic is the link between SP, the stress protein heme oxygenase-1 (HO-1), and CCL20 production. We investigated whether SP induces the release of chemokine CCL20 from immortalized PDL (IPDL) cells, and further clarify SP-mediated pathways. We also examined the relationship between HO-1 and CCL20 by treating PDL cells with SP. Incubating IPDL cells with SP increased expression of CCL20 mRNA and CCL20 protein in a dose-time-dependent manner. Highly selective p38 and extracellular-regulated kinase 1/2 (ERK1/2) inhibitors abrogated SP-induced expression of CCL20 in IPDL cells. SP is also responsible for initiating phosphorylation of IkappaB, degradation of IkappaB and activation of nuclear factor (NF)-kappaB. SP induced expression of HO-1 in both a concentration- and time-dependent manner, and CCL20 reflected similar patterns. The inductive effects of SP on HO-1 and CCL20 were enhanced by HO-1 inducer hemin and the membrane-permeable guanosine 3',5'-monophosphate (cGMP) analogue 8-bromo-cGMP. Conversely, this pathway was inhibited by the HO-1 inhibitor zinc protoporphyrin IX (ZnPP IX) and the selective inhibitor of guanylate cyclase, 1H-(1,2,4)oxadiazole(4,3-a)quinoxalin-1-one (ODQ). We report herein the pathway that connects SP along with other modulators of neuroimmunoregulation to the induction of HO-1 and the inflammatory mediator macrophage inflammatory protein (MIP)-3alpha/CCL20 in IPDL cells, which play an important role in the development of periodontitis or inflammation during orthodontic tooth movement.
    Full-text · Article · Jan 2008 · Clinical & Experimental Immunology
  • S-H Pi · S-C Kim · H-T Kim · H-J Lee · S-K Lee · E-C Kim
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    ABSTRACT: Although induction of heme oxygenase-1 by H2O2 has been reported, the protective role of heme oxygenase-1 against the cytotoxic and osteoclastogenic effects of H2O2 have not been elucidated in human periodontal ligament cells. The aim of this work was to investigate the defense mechanism of heme oxygenase-1 on H2O2-induced cytotoxicity and to analyze the expression of receptor activator of nuclear factor-kappaB ligand (RANKL) and osteoprotegerin as markers for osteoclast differentiation in periodontal ligament cells. Using human periodontal ligament cells, cytotoxicity was measured by the 3,4,5-dimethylthiazol-2-yl-2,5-diphenyl tetrazolium bromide (MTT) assay, and expression of heme oxygenase-1, RANKL, and osteoprotegerin mRNA was determined by reverse transcription-polymerase chain reaction. H2O2 produced a cytotoxic effect by reducing the cell viability and enhancing the expression of heme oxygenase-1 and RANKL mRNAs in a concentration- and time-dependent manner. Additional experiments revealed that heme oxygenase-1 inducer (hemin), a membrane-permeable cGMP analog (8-bromo-cGMP), carbon monoxide, extracellular signal-regulated kinase, p38 mitogen-activated protein kinase inhibitor, protein kinase inhibitor (KT5823), and nuclear factor-kappaB inhibitor (pyrrolidine dithiocarbamate) also blocked the effects of H2O2 on cell viability and RANKL mRNA expression in periodontal ligament cells. These data suggest that heme oxygenase-1 induction plays a protective role in periodontal ligament cells against the cytotoxic and RANKL-inducing effects of H2O2, through multiple signaling pathways.
    No preview · Article · Sep 2007 · Journal of Periodontal Research

Publication Stats

637 Citations
104.33 Total Impact Points


  • 2013-2014
    • Kyungpook National University Hospital
      Sŏul, Seoul, South Korea
  • 2008-2012
    • Seoul National University
      • Department of Surgery
      Sŏul, Seoul, South Korea
    • Kyungpook National University
      • Department of Oral Pathology
      Daikyū, Daegu, South Korea
  • 2006-2010
    • Wonkwang University
      • College of Dentistry
      Riri, North Jeolla, South Korea
  • 2009
    • Yonsei University
      Sŏul, Seoul, South Korea
    • Hanyang University
      Sŏul, Seoul, South Korea
    • Pohang University of Science and Technology
      • Department of Physics
      Geijitsu, Gyeongsangbuk-do, South Korea
  • 2007-2008
    • Korea Research Institute of Bioscience and Biotechnology KRIBB
      안산시, Gyeonggi-do, South Korea
  • 2006-2008
    • Yonsei University Hospital
      Sŏul, Seoul, South Korea
  • 2005-2006
    • Seoul National University Hospital
      • Department of Surgery
      Sŏul, Seoul, South Korea