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Original Article
The Tumor Suppressor Function of PTEN/MMAC1 through the Regulation of IGFs and IGFBPs
Ho Keun Yi, Dong Jin Hwang, Sun Young Kim, Dae Yeol Lee, Pyoung Han Hwang
Clin Exp Pediatr. 2004;47(8):884-891.   Published online August 15, 2004
Purpose : PTEN/MMAC1, a novel tumor suppressor gene, is mutated in a variety of advanced and metastatic cancers. It acts as a phosphatase, and thereby, regulates the PI-3 kinase/Akt pathway. In this study, we examined to evaluate the new function of anti-tumor effects of PTEN/MMAC1 through the regulation of the IGFs-IGFBPs in gastric cancer cells. Methods : PTEN/MMAC1 was expressed in...
Diagnostic Approach of Wiskott-Aldrich Syndrome
Dong Jin Hwang, Jun Won Yang, Sun Young Kim, Ho Keun Yi, Dae Yeol Lee, Pyoung Han Hwang
Clin Exp Pediatr. 2004;47(7):726-734.   Published online July 15, 2004
Objective : A probable diagnosis of Wiskott-Aldrich syndrome(WAS) should be considered in any boy presenting with unusual bleeding, congenital thrombocytopenia and small platelets. The definitive diagnosis of WAS is usually made by the detection of WASP gene mutation or a decrease or absence of the WAS protein(WASP) in blood cells using molecular genetic analysis. However, these methods are too time-consuming...
Novel Gap Junction Molecules, Connexin 37, Enhances the Bystander Effect in HSVtk/GCV Gene Therapy
Sun Young Kim, Ho Keun Yi, Jung Chang Lee, Dong Jin Hwang, Pyoung Han Hwang, Dae Yeol Lee, Soo Chul Cho
Clin Exp Pediatr. 2003;46(6):541-547.   Published online June 15, 2003
Purpose : Gap junction intercellular communication(GJIC) is an important mechanism of the bystander effect in herpes simplex thymidine kinase/ganciclovir(HSVtk/GCV) gene therapy Therefore, we attempted to enhance the bystander effect in vitro by exogenous overexpressing connexin 37(Cx37) in cells to increase GJIC. Methods : NIH3T3 cells were transfected with the Cx37 and HSVtk gene or the HSVtk gene alone by the calcium...
Case Report
A Case of Cerebral Vasculitis in Henoch-Shonlein Purpura
Soo Yeon Lee, Ju Mi Choung, Dong Jin Hwang, So Hee Eun, Pyoung Han Hwang
Clin Exp Pediatr. 2002;45(12):1601-1605.   Published online December 15, 2002
Henoch-Sh nlein Purpura(HSP) is an immuologically mediated systemic vasculitis of small blood vessels affecting predominantly the skin, gastrointestinal tract, joints, and kidneys. Clinical neurological manifestations such as headaches, behavioral changes, mental changes, seizures, and visual loss are described, but neurological complication are rare during the course of HSP. We experienced a case of an 8 year-old male with HSP who...