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Jung JY, Goo B, Choi YJ, Chung HJ, Chung KY. A case of granuloma pyogenicum presenting as an intravascular mass: evaluation by ultrasonography. J Eur Acad Dermatol Venereol 2008; 22:515-7. [DOI: 10.1111/j.1468-3083.2007.02377.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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77
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Jung JY, Roh MR, Chung HJ, Chung KY. Desmoplastic malignant melanoma evaluated with 18F-fluorodeoxyglucose positron emission tomography-computed tomography and sentinel lymph node biopsy. J Eur Acad Dermatol Venereol 2008; 22:126-7. [PMID: 18181996 DOI: 10.1111/j.1468-3083.2007.02290.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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78
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Yu SL, Chung HJ, Sang BC, Park CS, Lee JH, Yoon DH, Lee SH, Choi KD. Identification of differentially expressed genes in distinct skeletal muscles in cattle using cDNA microarray. Anim Biotechnol 2008; 18:275-85. [PMID: 17934901 DOI: 10.1080/10495390701413391] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The 788-gene microarray was manufactured using selected elements from three different cDNA libraries in order to identify molecular processes that determine phenotypic characteristics between loin (M. longissimus thoracis) and round (M. semimembranosus) muscles. Microarray analyses identified 24 differentially expressed genes between the two muscles investigated. Five of the genes were verified by quantitative RT-PCR and three of them were mapped on bovine chromosomes using 5,000 rad bovine radiation hybrid (RH) panel. The map locations indicated that they were mapped in the same chromosomal regions where IMF and growth QTLs were located, suggesting that they are most possible positional candidate genes for the traits.
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80
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Eun BL, Kim SW, Kim YK, Kim JW, Moon JS, Park SK, Sung IK, Shin SM, Yoo SM, Eun SH, Lee HK, Lim HT, Chung HJ. Overview of the national health screening program for infant and children. KOREAN JOURNAL OF PEDIATRICS 2008. [DOI: 10.3345/kjp.2008.51.3.225] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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81
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Eun BL, Chung HJ. Overview of the National Health Screening Program for Infant and Children. JOURNAL OF THE KOREAN MEDICAL ASSOCIATION 2008. [DOI: 10.5124/jkma.2008.51.1.74] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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82
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Chung HJ, Chi HS, Seo EJ, Jang S, Park CJ, Lee KH. [Erythroleukemic blast crisis of chronic myeloid leukemia.]. Korean J Lab Med 2007; 26:255-62. [PMID: 18156735 DOI: 10.3343/kjlm.2006.26.4.255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Erythroleukemic blast crisis of chronic myeloid leukemia (CML) is very rare. We report two cases of erythroleukemic blast crisis of CML resistant to imatinib treatment. Both patients made a rapid progression to blast crisis 6 and 4 months after diagnosis while being treated with imatinib 400 mg/day. Bone marrow aspiration revealed predominant erythroid precursors with 65.4% and 54.8% each. There were significant proportions (more than 20%) of myeloblasts among non-erythroid cells. Immunophenotyping revealed expression of glycophorin A confirming erythroleukemic blast crisis. The karyotyping result of patient 1 was 46,XX,t(9;22)(q34;q11.2)[3]/52,idem,+8,+12,+18,+21,+22,+der(22)t(9;22)[17] and that of patient 2 was 46,XX,inv(3)(q21q26.2),t(9;22)(q34;q11.2)[20]. Patient 1 showed no response to imatinib and BMS-354825 in the following bone marrow study. She died of septic shock as a complication of an infection after 69 days of blast crisis. Patient 2 received allogeneic bone marrow transplantation (BMT) in the cytogenetically no response state, but she also died of graft-versus-host disease 9 weeks after BMT. The poor prognosis and rapid progression of disease in both cases were correspondent to most of the reported cases. During the course of the disease of the two patients, we monitored the BCR-ABL chimeric mRNA with real-time quantitative polymerase chain reaction (RT-PCR), and it was found useful in predicting the imatinib response and progression to blast crisis of CML. Although both of our cases showed the typical bad prognosis and findings of erythroleukemic blast crisis of CML, the karyotypes were different from the expected type of t(3;21)(q26;q22). But the relationship between additional changes of EVI1 on chromosome 3q26 shown in case 2, and progression to the erythroleukemic blast crisis need further investigation.
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Chung HJ, Seo EJ, Kim KH, Jang S, Park CJ, Chi HS, Lee JH, Lee JH, Lee KH. [Hematologic and clinical features of 3q21q26 syndrome: extremely poor prognosis and association with central diabetes insipidus]. Korean J Lab Med 2007; 27:133-8. [PMID: 18094565 DOI: 10.3343/kjlm.2007.27.2.133] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND 3q21q26 syndrome includes chromosomal abnormalities of inv(3)(q21q26), t(3;3) (q21;q26), and ins(3;3)(q26;q21q26). It causes hematological diseases by the leukemogenic mechanism that the enhancer of ribophorin I gene in 3q21 induces the transcription of ecotropic viral integration site-1 gene in 3q26. Recently, it has been proposed that the 3q21q26 syndrome may be preceded by diabetes insipidus (DI), particularly when combined with monosomy 7, and is a unique disease entity. METHODS From May 2001 to June 2006, a total of 5 patients with hematologic malignancy were found to have 3q21q26 syndrome and monosomy 7. Laboratory findings, clinical data, and association with DI were investigated. RESULTS The rearrangement type of 3q21q26 was inv(3)(q21q26) in four patients and t(3;3)(q21; q26) in one. These patients' French American British types were AML M1, M2, M4 and M7, showing evident dysmegakaryopoiesis. Aberrant antigenic expressions of CD7 and CD56 were observed. The platelet count was relatively high as AML. All the five patients were refractory or in early relapse. Patient 5 was diagnosed with AML M7 20 days after being diagnosed with DI. While DI was well controlled with oral desmopressin, leukemia was refractory to chemotherapy. CONCLUSIONS This study supports the recent opinion that 3q21q26 syndrome with monosomy 7 combined with DI is a disease of unique characteristics. In the relation between DI and monosomy 7 or 3q21q26 syndrome, there has been no explanation about how acquired abnormality of hematopoietic cells affects production of DDAVP by neurohormonal cells in hypothalamus. The mechanism needs further study, and this research should contribute to the understanding of genetic roles in leukemia appearing in different forms.
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Goo B, Chung HJ, Chung WG, Chung KY. Intramuscular immunoglobulin for recalcitrant suppurative diseases of the skin: a retrospective review of 63 cases. Br J Dermatol 2007; 157:563-8. [PMID: 17627790 DOI: 10.1111/j.1365-2133.2007.08069.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Intramuscular human immunoglobulin (HIG) may provide a therapeutic option as an independent or combined treatment for recalcitrant suppurative skin diseases such as hidradenitis suppurativa, folliculitis decalvans, or chronic recurrent furunculosis or folliculitis. OBJECTIVES To define the efficacy and safety of intramuscular HIG for chronic and recalcitrant suppurative skin diseases. METHODS Patients who had received HIG for hidradenitis suppurativa, folliculitis decalvans, furunculosis or folliculitis at Severance Hospital, Seoul, Korea, between January 2000 and May 2005 were identified from medical/pharmacy records. All records were analysed retrospectively. RESULTS Sixty-three patients were identified. After treatment, 37 patients (59%) showed overall improvement and were rated as having an 'excellent response' or 'good response' by the attending physician. No improvement or worsening was seen in only three patients (5%). A period without new lesions (PWNL) was achieved in 46 patients (73%). The number of times HIG was administered to achieve PWNL ranged from 1 to 12 (mean +/- SD 2.15 +/- 1.69). There was no significant difference in the rating score between the independent intramuscular HIG and the combined treatment groups. Pain at the injection site was the major side-effect, which led to the discontinuation of treatment in five patients. No other significant systemic side-effects were observed. CONCLUSIONS Our results demonstrate that intramuscular HIG may be used for the treatment of recalcitrant suppurative skin diseases as an independent or combined treatment.
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Abstract
L-type voltage-gated calcium channels (LTCs) may control neuronal gene expression by increasing nuclear Ca(2+) levels or regulating Ca(2+)/calmodulin-dependent transcription factors. In the November 3 issue of Cell, Gomez-Ospina et al. demonstrate another signaling mechanism, in which a C-terminal fragment of LTC translocates to the nucleus in a calcium-dependent manner and directly regulates transcription.
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86
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Yeon JE, Yoo W, Hong SP, Chang YJ, Yu SK, Kim JH, Seo YS, Chung HJ, Moon MS, Kim SO, Byun KS, Lee CH. Resistance to adefovir dipivoxil in lamivudine resistant chronic hepatitis B patients treated with adefovir dipivoxil. Gut 2006; 55:1488-95. [PMID: 16461777 PMCID: PMC1856440 DOI: 10.1136/gut.2005.077099] [Citation(s) in RCA: 178] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Adefovir dipivoxil (ADV) is a potent nucleotide analogue against both the wild-type and lamivudine (LMV) resistant hepatitis B virus (HBV). The cumulative incidence of ADV resistant mutations in the nucleoside/-tide treatment naive chronic hepatitis B patient (CHB) at weeks 48, 96, and 144 was 0, 0.8-3%, and approximately 5.9%, respectively. AIMS The aim of this study was to characterise the genotypic and phenotypic mutation profiles to ADV in 67 LMV resistant CHB patients who were treated with ADV. METHODS Serum HBV DNA was quantified by real time polymerase chain reaction. The ADV mutant was detected using matrix assisted laser desorption/ionisation time of flight mass spectrometry based genotyping assays, termed restriction fragment mass polymorphism (RFMP). RESULTS RFMP analysis revealed that a total of 11 amino acid substitutions developed in the rt domain of the HBV polymerase in nine patients. The cumulative incidence of genotypic ADV resistance at months 12 and 24 was 6.4% and 25.4%, respectively. The rtA181V, rtN236T, and rtA181T mutations were detected in five, four, and two of the 67 patients at treatment months 12-17, 3-19, and 7-20, respectively. Serial quantification of serum HBV DNA revealed that two patients with the rtA181V mutation, with or without the rtN236T mutation, and one patient with the rtA181T mutation displayed HBV DNA rebound. CONCLUSION Emergence of the ADV mutation in LMV resistant patients who are treated with ADV appeared to present earlier and more frequently than was reported in previous studies on nucleoside/-tide treatment naive patients.
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87
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Chung HJ, Jan YN, Jan LY. Polarized axonal surface expression of neuronal KCNQ channels is mediated by multiple signals in the KCNQ2 and KCNQ3 C-terminal domains. Proc Natl Acad Sci U S A 2006; 103:8870-5. [PMID: 16735477 PMCID: PMC1472242 DOI: 10.1073/pnas.0603376103] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The M channels, important regulators of neuronal excitability, are voltage-gated potassium channels composed of KCNQ2-5 subunits. Mutations in KCNQ2 and KCNQ3 cause benign familial neonatal convulsions (BFNC), dominantly inherited epilepsy and myokymia. Crucial for their functions in controlling neuronal excitability, the M channels must be placed at specific regions of the neuronal membrane. However, the precise distribution of surface KCNQ channels is not known. Here, we show that KCNQ2/KCNQ3 channels are preferentially localized to the surface of axons both at the axonal initial segment and more distally. Whereas axonal initial segment targeting of surface KCNQ channels is mediated by ankyrin-G binding motifs of KCNQ2 and KCNQ3, sequences mediating targeting to more distal portion of the axon reside in the membrane proximal and A domains of the KCNQ2 C-terminal tail. We further show that several BFNC mutations of KCNQ2 and KCNQ3 disrupt surface expression or polarized surface distribution of KCNQ channels, thereby revealing impaired targeting of KCNQ channels to axonal surfaces as a BFNC etiology.
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88
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Yu SL, Kim JE, Chung HJ, Jung KC, Lee YJ, Yoon DH, Lee SH, Choi I, Bottema CDK, Sang BC, Lee JH. Molecular cloning and characterization of bovine PRKAG3 gene: structure, expression and single nucleotide polymorphism detection. J Anim Breed Genet 2006; 122:294-301. [PMID: 16191037 DOI: 10.1111/j.1439-0388.2005.00545.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The protein kinase adenosine monophosphate-activated gamma3-subunit (PRKAG3) gene encodes a muscle-specific isoform of the regulatory gamma-subunit of adenosine monophosphate-activated protein kinase, which plays a key role in regulating energy homeostasis in eucaryotes. It is well known that mutations in the PRKAG3 gene affect high glycogen content in the porcine skeletal muscle and, consequently, meat quality. The genomic structure and sequence of the bovine PRKAG3 were analysed from a Korean cattle BAC clone. The bovine PRKAG3 gene comprises 13 exons and spans approximately 6.8 kb on BTA2. From 5' and 3'-rapid amplification of cDNA ends experiments, the full-length cDNA of bovine PRKAG3 has been identified, encoding a deduced protein of 465 amino acids. Two splice isoforms, generated by the alternative splicing of exon 2, were also identified. Northern blot analysis demonstrated that, similar to other species, the bovine PRKAG3 transcript was only expressed in skeletal muscle. Seven single nucleotide polymorphisms, including two previously identified variants, were detected in four Bos taurus cattle breeds. The bovine PRKAG3 gene described in this study may be involved in muscle-related genetic diseases or meat quality traits in cattle.
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89
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Song YS, Lee KH, Yoon JH, Park YH, Kim JH, Choi DH, Jeon JS, Kim SJ, Chung HJ, Song ES, Won JH. Molecular MRI Images of the Transplanted Human Mesenchymal Stem Cells in the Liver, Kidney, Bladder and Penile Cavernosum of Rats. Korean J Urol 2006. [DOI: 10.4111/kju.2006.47.8.882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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90
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Chung HJ. Neurobiological basis for learning disorders with a special emphasis on reading disorders. KOREAN JOURNAL OF PEDIATRICS 2006. [DOI: 10.3345/kjp.2006.49.4.341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kim J, Goo SY, Chung HJ, Yang HW, Yong TS, Lee KH, Park SJ. Interaction of beta-giardin with the Bop1 protein in Giardia lamblia. Parasitol Res 2005; 98:138-44. [PMID: 16362343 DOI: 10.1007/s00436-005-0040-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2005] [Accepted: 09/26/2005] [Indexed: 10/25/2022]
Abstract
A cDNA clone encoding a putative Bop1 homologous protein was identified in Giardia lamblia. Since Bop1 is a nucleolar protein involved in rRNA processing, thereby controlling the cell cycle, we investigated components of cell cycle control in G. lamblia by identifying the protein(s) that interact with Bop 1. Through an immunoaffinity column made with polyclonal antibodies specific to the recombinant Bop1 of G. lamblia, a pool of proteins was obtained from the crude extracts of Giardia and then used as antigens to immunize rats. By employing the resultant sera for cDNA library immunoscreening, we isolated cDNA clones encoding an immunopurified protein, which turned out to contain the gene for beta-giardin, a Giardia-specific cytoskeletal protein. The interaction between Bop1 and beta-giardin was confirmed via two different methods, yeast two-hybrid assay and coimmunoprecipitation.
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Chung HJ, Huang YH, Lau LF, Huganir RL. Regulation of the NMDA receptor complex and trafficking by activity-dependent phosphorylation of the NR2B subunit PDZ ligand. J Neurosci 2005; 24:10248-59. [PMID: 15537897 PMCID: PMC6730169 DOI: 10.1523/jneurosci.0546-04.2004] [Citation(s) in RCA: 233] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Interactions between NMDA receptors (NMDARs) and the PDZ [postsynaptic density-95 (PSD-95)/Discs large/zona occludens-1] domains of PSD-95/SAP90 (synapse-associated protein with a molecular weight of 90 kDa) family proteins play important roles in the synaptic targeting and signaling of NMDARs. However, little is known about the mechanisms that regulate these PDZ domain-mediated interactions. Here we show that casein kinase II (CK2) phosphorylates the serine residue (Ser1480) within the C-terminal PDZ ligand (IESDV) of the NR2B subunit of NMDAR in vitro and in vivo. Phosphorylation of Ser1480 disrupts the interaction of NR2B with the PDZ domains of PSD-95 and SAP102 and decreases surface NR2B expression in neurons. Interestingly, activity of the NMDAR and Ca2+/calmodulin-dependent protein kinase II regulates CK2 phosphorylation of Ser1480. Furthermore, CK2 colocalizes with NR1 and PSD-95 at synaptic sites. These results indicate that activity-dependent CK2 phosphorylation of the NR2B PDZ ligand regulates the interaction of NMDAR with PSD-95/SAP90 family proteins as well as surface NMDAR expression and may be a critical mechanism for modulating excitatory synaptic function and plasticity.
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93
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Xie XN, Chung HJ, Sow CH, Bettiol AA, Wee ATS. Water-Bridge-Assisted Ionic Conduction in Probe-Induced Conical Polymer Pattern Formation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2005; 17:1386-1390. [PMID: 34412439 DOI: 10.1002/adma.200500204] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Accepted: 03/09/2005] [Indexed: 06/13/2023]
Abstract
Formation of conical polymer structures by atomic force microscopy (AFM) nanolithography and the electrical-conduction mechanism involved in the AFM- probe-induced patterning process are reported. The current is dominated by water-bridge-assisted ionic conduction. Polymer phase transition and mass redistribution occur without modification or degradation of the poly(methyl methacrylate) (PMMA) material.
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94
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Kim SW, Ban SH, Chung H, Cho S, Chung HJ, Choi PS, Yoo OJ, Liu JR. Taxonomic discrimination of flowering plants by multivariate analysis of Fourier transform infrared spectroscopy data. PLANT CELL REPORTS 2004; 23:246-50. [PMID: 15248083 DOI: 10.1007/s00299-004-0811-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2003] [Revised: 04/19/2004] [Accepted: 04/20/2004] [Indexed: 05/11/2023]
Abstract
Fourier transform infrared spectroscopy (FTIR) provides biochemical profiles containing overlapping signals from a majority of the compounds that are present when whole cells are analyzed. Leaf samples of seven higher plant species and varieties were subjected to FTIR to determine whether plants can be discriminated phylogenetically on the basis of biochemical profiles. A hierarchical dendrogram based on principal component analysis (PCA) of FTIR data showed relationships between plants that were in agreement with known plant taxonomy. Genetic programming (GP) analysis determined the top three to five biomarkers from FTIR data that discriminated plants at each hierarchical level of the dendrogram. Most biomarkers determined by GP analysis at each hierarchical level were specific to the carbohydrate fingerprint region (1,200-800 cm(-1)) of the FTIR spectrum. Our results indicate that differences in cell-wall composition and structure can provide the basis for chemotaxonomy of flowering plants.
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95
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Choi PS, Kim YD, Choi KM, Chung HJ, Choi DW, Liu JR. Plant regeneration from hairy-root cultures transformed by infection with Agrobacterium rhizogenes in Catharanthus roseus. PLANT CELL REPORTS 2004. [PMID: 14963692 DOI: 10.1007/s00299-004-0765-763] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Hypocotyl explants of Catharanthus roseus produced hairy roots when cultured on Murashige and Skoog (MS) basal medium after infection by Agrobacterium rhizogenes. Explants gave rise to adventitious shoots at a frequency of up to 80% when cultured on MS medium supplemented with 31.1 microM 6-benzyladenine and 5.4 microM alpha-naphthaleneacetic acid. There was a significant difference in the frequency of adventitious shoot formation for each hairy-root line derived from a different cultivar. Plants derived from hairy roots exhibited prolific rooting and had shortened internodes. Approximately half of the plants had wrinkled leaves and an abundant root mass with extensive lateral branching, but otherwise appeared morphologically normal. Plants with hairy roots that were derived from the cultivar Cooler Apricot developed flowers with petals that were white in the proximal region, whereas the wild-type flower petals are red. PCR and Southern blot analyses revealed that plants derived from hairy roots retained the Ri TL-DNA.
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96
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Choi PS, Kim YD, Choi KM, Chung HJ, Choi DW, Liu JR. Plant regeneration from hairy-root cultures transformed by infection with Agrobacterium rhizogenes in Catharanthus roseus. PLANT CELL REPORTS 2004; 22:828-31. [PMID: 14963692 DOI: 10.1007/s00299-004-0765-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2003] [Accepted: 01/06/2004] [Indexed: 05/07/2023]
Abstract
Hypocotyl explants of Catharanthus roseus produced hairy roots when cultured on Murashige and Skoog (MS) basal medium after infection by Agrobacterium rhizogenes. Explants gave rise to adventitious shoots at a frequency of up to 80% when cultured on MS medium supplemented with 31.1 microM 6-benzyladenine and 5.4 microM alpha-naphthaleneacetic acid. There was a significant difference in the frequency of adventitious shoot formation for each hairy-root line derived from a different cultivar. Plants derived from hairy roots exhibited prolific rooting and had shortened internodes. Approximately half of the plants had wrinkled leaves and an abundant root mass with extensive lateral branching, but otherwise appeared morphologically normal. Plants with hairy roots that were derived from the cultivar Cooler Apricot developed flowers with petals that were white in the proximal region, whereas the wild-type flower petals are red. PCR and Southern blot analyses revealed that plants derived from hairy roots retained the Ri TL-DNA.
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97
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Jung KC, Yu SL, Chung HJ, Kim TH, Jeon JT, Choi KD, Sang BC, Park CS, Lee JH. Assignment of protein kinase, AMP-activated,beta 2 non-catalytic subunit (PRKAB2) gene to porcine chromosome 4q21 23 by somatic cell and radiation hybrid panel mapping. Cytogenet Genome Res 2004; 103:202C. [PMID: 15008142 DOI: 10.1159/000076316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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98
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Kim SW, Ban SH, Chung HJ, Choi DW, Choi PS, Yoo OJ, Liu JR. Taxonomic discrimination of higher plants by pyrolysis mass spectrometry. PLANT CELL REPORTS 2004; 22:519-522. [PMID: 14520500 DOI: 10.1007/s00299-003-0714-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2003] [Revised: 08/22/2003] [Accepted: 08/22/2003] [Indexed: 05/24/2023]
Abstract
Pyrolysis mass spectrometry (PyMS) is a rapid, simple, high-resolution analytical method based on thermal degradation of complex material in a vacuum and has been widely applied to the discrimination of closely related microbial strains. Leaf samples of six species and one variety of higher plants (Rosa multiflora, R. multiflora var. platyphylla, Sedum kamtschaticum, S. takesimense, S. sarmentosum, Hepatica insularis, and H. asiatica) were subjected to PyMS for spectral fingerprinting. Principal component analysis of PyMS data was not able to discriminate these plants in discrete clusters. However, canonical variate analysis of PyMS data separated these plants from one another. A hierarchical dendrogram based on canonical variate analysis was in agreement with the known taxonomy of the plants at the variety level. These results indicate that PyMS is able to discriminate higher plants based on taxonomic classification at the family, genus, species, and variety level.
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Chung HJ, Pak JK, Kim BK, Lee YK, Im SK, Seong HH, Uhm SJ, Lee HT, Chung KS, Min KS, Kim JH, Wakasugi N, Chang WK. Differences in embryonic development in sensitive and resistant matings to pregnancy block stimuli in mice. Reproduction 2003; 126:327-35. [PMID: 12968940 DOI: 10.1530/rep.0.1260327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Pregnancy block from exposure to foreign male mouse pheromones is sensitive to both male and female mating strain, as well as the foreign male pheromone-producing strain. Incidence of pregnancy block by male pheromones in mice is different depending on the combination of females, stud males and stimulus males. BALB/cA females mated with BALB/cA males showed a 100% pregnancy block when exposed to males of the DDK strain (Chung et al., 1997). In contrast, BALB/cA females mated with males of dissimilar strain show high rates of pregnancy even if they are exposed to DDK males; this difference is thought to be due to the difference in viability of embryos (Chung et al., 1999). The present study investigated how development of BALB/cA and F1 embryos differ under the influence of pregnancy block stimuli. F1 embryos had significantly higher numbers of cells than did the BALB/cA embryos (P<0.05) at day 3 of pregnancy after exposure to DDK males or after bromocriptine (dopamine agonist, 4 mg kg(-1), i.p.) treatment. Histological observation after bromocriptine treatment revealed that: (i) on day 4 of pregnancy, BALB/cA embryos tended to form a large blastocoel, but showed abnormalities such as degeneration of primitive endoderm and depression of the outer trophoblast-distal endoderm layer at the periphery of the inner cell mass (ICM) or detachment of the ICM from the outer layer. In contrast, 60-70% of F1 embryos were normal late blastocysts and incipient egg cylinders, but 28-40% of early blastocysts were degenerating; and (ii) day 5 BALB/cA embryos were in the range from incipient egg cylinder with a large proamniotic cavity to ectoplacental cone only, but their proximal endoderm and trophoblast-distal endoderm layer were degenerating. In contrast, the F1 embryos were mostly at the egg cylinder stage and maintained normal structure except for occasional enlargement of the developing yolk sac cavity. These results indicate that the lining of the inner surface of trophoblast by distal endoderm layer may be more firmly established and that the inner environment for development of F1 embryos may be more effectively maintained, thereby making them more resistant to deleterious influences due to pregnancy block stimuli than are BALB/cA embryos.
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Chung HJ, Steinberg JP, Huganir RL, Linden DJ. Requirement of AMPA receptor GluR2 phosphorylation for cerebellar long-term depression. Science 2003; 300:1751-5. [PMID: 12805550 DOI: 10.1126/science.1082915] [Citation(s) in RCA: 287] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cerebellar long-term depression (LTD) is a model of synaptic memory that requires protein kinase C (PKC) activation and is expressed as a reduction in the number of postsynaptic alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) receptors. LTD was absent in cultured cerebellar Purkinje cells from mutant mice lacking the AMPA receptor GluR2 subunit and could be rescued by transient transfection with the wild-type GluR2 subunit. Transfection with a point mutant that eliminated PKC phosphorylation of Ser880 in the carboxy-terminal PDZ ligand of GluR2 failed to restore LTD. In contrast, transfection with a point mutant that mimicked phosphorylation at Ser880 occluded subsequent LTD. Thus, PKC phosphorylation of GluR2 Ser880 is a critical event in the induction of cerebellar LTD.
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