It had been 36 years after it first started; a radical reform had been done on the postgraduate clinical training system.The subject point of the change was that in the past, mainly in University hospitals, where postgraduate clinical trainingsystem was managed mainly by the Department of a resident's planned medical staff, to enter in the future; in the newsystem, a resident is incorporated in a training program with contents of internal medicine, surgery and emergency, notjust bounded to particular field, in order to master basic and general clinical abilities. The new postgraduate clinicaltraining system is also expected for the hospital's side to become activated by remaining the clinical training system, andothers. As a matter of course, the System has given a great effect to the curriculums of undergraduate medical education, and so, a revision of medical education to bring up medical staff of excellent quality, is also on its way.

1) The National Hospital Organization has established a new clinical training system for the doctors who will finish the compulsory postgraduate clinical training in April 2006, to go forward into specialized fields in the future.
2) The aim of this system is that a doctor is incorporated in a training program with contents to cultivate mainly clinical abilities in particular fields, whereas the present system is on the job training without any program.
3) We hope that this new system will expand into the hospitals outside of the National Hospital Organization.

BACKGROUND: Understanding the regulatory mechanisms of the smooth muscle cells differentiation is one of the central issues in researches of atherogenesis where smooth muscle cells undergo dedifferentiation and regain embryonic phenotype. Smooth muscle myosin heavy chain isoforms(SM1,SM2) are important molecular markers to define the stage of smooth muscle cell differentiation. METHODS: In order to establish an in vitro model of smooth muscle cell differentiation using a pluripotent murine embryonal teratocarcinoma cell line(P19 cell), we first isolated cDNA clone of mouse SM1 and then tried various chemicals to induce P19 cells to differentiate into smooth muscle cells, The expression of Sm1 and alpha-smooth muscle actin was examined using RNase protection assay, Western blotting and indirect immunofluorescence. RESULTS: In the presence of luM retinoic acid, a small proportion of P19 cells could be in duced to differentiate into smooth muscle cells expressing SM1 as well as alpha-smooth muscle actin since day 8 after treatment. By blocking the Brain-2 expression, thus inhibiting neuronal differentiation, we could obtain more abundant differentiated smooth muscle cells. Sequential immunofluorescencc demonstrated that it took weveral days for smooth muscle myosin heavy chain to organize completely in differentiation smooth muscle cells. On the other hand, 10nM retinoic acid, 1% dimethyl sulfoxide or 2mM hexamethylene bisacetamide could not indduce P19 cell to differentiate to smooth muscle cells. CONCLUSION: In conclusion, P19 cells can be induced to differentiate into smooth muscle cells and this in vitro system will be useful in understanding the regulation of SM1 gene expression as well as of angiogenesis.
Actins ; Animals ; Atherosclerosis ; Blotting, Western ; Clone Cells ; Dimethyl Sulfoxide ; DNA, Complementary ; Fluorescent Antibody Technique, Indirect ; Gene Expression ; Hand ; Mice ; Muscle, Smooth* ; Myocytes, Smooth Muscle* ; Myosin Heavy Chains ; Neurons ; Phenotype ; Ribonucleases ; Teratocarcinoma* ; Tretinoin