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Y Ko

Publications and source records attributed to Y Ko.

149 records · Page 9Linked to original sources
PubMedDate not supplied

Lipid-induced changes in vascular smooth muscle cell membrane fluidity are associated with DNA synthesis.

In the present study, we examined whether changes in the membrane fluidity of vascular smooth muscle cells (VSMCs) alter their DNA synthesis. For this purpose, the membrane fluidity of the cells was modulated after treatment of VSMCs with 1,2-dioleoyl phosphatidylcholine (PC). Treatment of VSMCs with 1,2-dioleoyl PC-rich medium containing 10% heat-inactivated human serum and 3 mg/ ml 1,2-dioleoyl PC for 24 h resulted in an increase in VSMC membrane fluidity at all temperatures from 15 degrees to 40 degrees C as well as a 51% inhibition of DNA synthesis, compared with untreated cells. Remarkably, enrichment of VSMCs with 1,2-dioleoyl PC/cholesterol-rich medium containing 10% human serum, 3 mg/ml 1,2-dioleoyl PC and 2 mg/ml cholesterol restored both membrane fluidity and DNA synthesis to the levels of untreated cells. The present findings show an inverse association between increased membrane fluidity and cellular DNA synthesis.

Animals↗
PubMedDate not supplied

Limitations of detection of bone-marrow micrometastasis in prostate carcinoma patients by CK18/PSA immunocytochemistry and PSA RT-PCR.

BACKGROUND: The aim of this study was to prove the reliability of cytokeratin 18/prostate specific antigen (CK18/PSA) immunocytochemistry to detect tumor cells in the bone marrow of patients with prostate cancer (CaP) compared with a control group without CaP. PATIENTS AND METHODS: In bone marrow aspirates of 34 patients with CaP and 11 control patients without CaP, CK18/PSA immunocytochemistry was performed and compared with PSA RT-PCR in bone marrow and blood. RESULTS: 12% of tumors showed a positive staining with PSA and and 17% with CK 18 immunocytochemistry. There was no correlation with the stage or grade of the CaP. False positive results occurred in 2 out of 6 males without CaP and in 2 out of 5 women. 35% of the samples were found to have PSA-mRNA signals in RT-PCR which were neither associated with the histological stage or grade nor the PSA staining in immunocytochemistry. CONCLUSION: False positive staining results were obtained in control patients. Detection of PSA-mRNA was not associated with immunocytochemistry. Neither immunocytochemical nor PCR results were associated with the histological stage of the CaP. Thus, detection of micrometastasis using immunocytochemical methods has to be interpreted with caution and cannot be recommended as a clinical staging procedure.

Adenocarcinoma↗