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Articles by Y. M Kim
Total Records ( 6 ) for Y. M Kim
  S. A Lee , Y. M Kim , T. K Kwak , H. J Kim , S Kim , W Ko , S. H Kim , K. H Park , M Cho and J. W. Lee
 

Four-transmembrane L6 family member 5 (TM4SF5) and its homolog L6, a tumor antigen, form a four-transmembrane L6 family. TM4SF5 expression causes uncontrolled cell proliferation and angiogenesis. Although other genuine transmembrane 4 superfamily (TM4SF) members co-operate with integrins for cell migration, roles of TM4SF5 in the cellular spreading and migration are unknown. Using hepatocarcinoma cell clones that ectopically express TM4SF5, we found that cross talks via an extracellular interaction between TM4SF5 and integrin 2 in collagen type I environment inhibited integrin 2 functions such as spreading on and migration toward collagen I, which were recovered by suppression of TM4SF5 or structural disturbance of its second extracellular loop using a peptide or mutagenesis. Altogether, the observations suggest that TM4SF5 in hepatocytes negatively regulates integrin 2 function via an interaction between the extracellular loop 2 of TM4SF5 and integrin 2 during cell spreading on and migration through collagen I environment.

  H. J Choi , H. G Kang , T. H Lim , H. S Chung , J Cho , Y. M Oh , Y. M Kim and on behalf of the Korean Emergency Airway Management Registry (KEAMR) Investigators
  Objective

To investigate the use and success rates of the GlideScope (GVL) by emergency physicians (EPs) during the initial two years after its introduction.

Methods

We performed an observational study using registry data of five emergency departments. The success rates in adult patients were evaluated and compared with those of conventional laryngoscope (CL).

Results

The GVL was used in 345 (10.7%) of 3233 intubation attempts by EPs. The overall success rate of the GVL was not higher than a CL (79.1% vs 77.6%, p=0.538). The success rate for the patients with difficult airway was higher in the GVL than a CL (80.0% vs 50.4%, p<0.001).

Conclusion

The GVL was not used frequently by EPs during the initial two years after its introduction. Although the GVL provides a better glottic view, the overall success rates were similar to a CL. The GVL may be useful in patients with difficult airway.

  K. C Chun , D. Y Kim , J. H Kim , Y. M Kim , Y. T Kim and J. H. Nam
 

To date, only seven women with Stage Ib1 to IIb cervical cancer during pregnancy treated with neoadjuvant chemotherapy followed by radical surgery have been reported. We describe three cases of pregnant women with Stage Ib1 to IIa cervical cancer who were treated with paclitaxel plus platinum neoadjuvant chemotherapy followed by radical surgery. The first patient had a Stage Ib1 small cell neuroendocrine carcinoma of the cervix, the second had a Stage IIa, 8 cm squamous cell carcinoma of the cervix and the third had a Stage Ib2 squamous cell carcinoma and positive lymph nodes. The three patients and their newborns were followed up. All patients had a partial or complete response to neoadjuvant chemotherapy. Two of these patients developed recurrences and one died due to progressive disease at 49 months. All neonates were healthy and had no abnormalities. In conclusion, neoadjuvant chemotherapy with paclitaxel and platinum followed by radical surgery may be an option for pregnant women with invasive cervical cancer.

  H. I Lee , J. H Yoon , J. S Nam , Y. M Kim and Y. T. Ro
 

The gene encoding a catalase–peroxidase (KatG) was cloned from chromosomal DNA of a fast-growing Mycobacterium sp. strain JC1 DSM 3803. The nucleotide sequence of a 5.7 kb EcoRI fragment containing the katG and its flanking regions was determined. The fragment (5,706 bps) contained two complete open reading frames (ORFs) encoding putative ferric uptake regulator A (FurA) and KatG proteins. The cloned gene, katG, had an ORF of 2241 nt, encoding a protein with calculated molecular mass of 81,748 Da. The furA was located in the upstream of the katG with the same transcriptional direction and there was a 38 bp gap space between them. The deduced KatG and FurA protein sequences showed significant homologies to KatG2 and Fur2 of Mycobacterium smegmatis and clustered with other mycobacterial KatG and Fur-like proteins in phylogenetic trees, respectively. The recombinant KatG overproduced in Escherichia coli was nearly indistinguishable from the native JC1 catalase–peroxidase in enzymatic properties and also possessed the resistance to organic solvents, indicating that the cloned katG truly encodes the Mycobacterium sp. JC1 catalase–peroxidase. Difference spectroscopy revealed Mn(II) binding near the haem of the KatG. Transcript analysis of the furA–katG using RT–PCR suggests that the katG is independently transcribed from the furA.

  D Trageser , I Iacobucci , R Nahar , C Duy , G von Levetzow , L Klemm , E Park , W Schuh , T Gruber , S Herzog , Y. m Kim , W. K Hofmann , A Li , C. T Storlazzi , H. M Jack , J Groffen , G Martinelli , N Heisterkamp , H Jumaa and M. Muschen
 

B cell lineage acute lymphoblastic leukemia (ALL) arises in virtually all cases from B cell precursors that are arrested at pre–B cell receptor–dependent stages. The Philadelphia chromosome–positive (Ph+) subtype of ALL accounts for 25–30% of cases of adult ALL, has the most unfavorable clinical outcome among all ALL subtypes and is defined by the oncogenic BCR-ABL1 kinase and deletions of the IKAROS gene in >80% of cases. Here, we demonstrate that the pre–B cell receptor functions as a tumor suppressor upstream of IKAROS through induction of cell cycle arrest in Ph+ ALL cells. Pre–B cell receptor–mediated cell cycle arrest in Ph+ ALL cells critically depends on IKAROS function, and is reversed by coexpression of the dominant-negative IKAROS splice variant IK6. IKAROS also promotes tumor suppression through cooperation with downstream molecules of the pre–B cell receptor signaling pathway, even if expression of the pre–B cell receptor itself is compromised. In this case, IKAROS redirects oncogenic BCR-ABL1 tyrosine kinase signaling from SRC kinase-activation to SLP65, which functions as a critical tumor suppressor downstream of the pre–B cell receptor. These findings provide a rationale for the surprisingly high frequency of IKAROS deletions in Ph+ ALL and identify IKAROS-mediated cell cycle exit as the endpoint of an emerging pathway of pre–B cell receptor–mediated tumor suppression.

 
 
 
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