Biomedical subjects

Lian-Ying Wu

Publications and source records attributed to Lian-Ying Wu.

4 recordsLinked to original sources

PubMed2006

[Investigation of discrepant proteins between two breast cancer cell lines with different metastatic abilities].

BACKGROUND & OBJECTIVE: Metastasis associated proteins play important roles in metastasis. This study was to investigate proteins which may be involved in breast cancer cell metastasis and further explore the potential mechanisms. METHODS: LM-MCF-7 and MCF-7, two breast cancer cell lines with different metastatic potentials, derived from the same parent cell line, were used in our study. Proteomics and Western blot were applied to identify differentially expressed proteins. Wound healing assay was performed to observe the effect of survivin gene on breast cancer cell migration by transfecting pcDNA3-Sur plasmid into MCF-7 cells. RESULTS: Eight differently expressed proteins, which were correlated with cell structures, cellular metabolism, apoptosis, protein enfold or interaction, were identified. Protein expression of nm23 and p27 was relatively higher in MCF-7 cells; while the expression of survivin, Bcl-2 and myosin light chain kinase was relatively higher in LM-MCF-7 cells. Increased migration ability was observed in MCF-7 cells which were transfected with pcDNA3-Sur. CONCLUSION: Metastasis associated proteins exist in breast cancer cell lines with different metastatic abilities. Survivin is closely related to the metastasis in breast cancer cells.

Blotting, Western↗

PubMed2004

tNOX is both necessary and sufficient as a cellular target for the anticancer actions of capsaicin and the green tea catechin (-)-epigallocatechin-3-gallate.

Capsaicin and the principal green tea catechin, (-)-epigallocatechin-3-gallate (EGCg), target tNOX, a tumor (cancer)-specific surface hydroquinone (NADH) oxidase with protein disulfide-thiol interchange activity (ECTO-NOX protein). Accordingly vector-forced over expression of tNOX in MCF-10A mammary epithelia or COS cells that lack tNOX or in COS cells that underexpress tNOX enhanced the susceptibility of growth and apoptosis to both EGCg and capsaicin. Additionally, the tNOX-transfected MCF-10A cells proliferated in Matrigel, a measure of invasiveness. In contrast, oligomeric antisense tNOX DNA abrogated growth inhibition by EGCg and capsaicin and reduced anchorage-dependent growth of HeLa (human cervical carcinoma) cells that naturally overexpress tNOX. The findings show cell surface expression of tNOX as both necessary and sufficient for the cellular anticancer activities attributed to both EGCg and capsaicin.

Animals↗

PubMed2003

Adriamycin tolerance in human mesothelioma lines and cell surface NADH oxidase.

Adriamycin tolerant human mesothelioma cell lines derived from a single tumor prior to either chemotherapy or radiation therapy and a susceptible cell line were investigated. Not only was growth resistant to low doses of adriamycin but an unusual pattern of resistance was encountered in which cells seemed to better tolerate high adriamycin doses than intermediate doses. The differential growth susceptibility of the tolerant lines compared to A549 lung carcinoma and the bimodal dose response correlated with differences in the specific activity of a plasma membrane-associated NADH oxidase (NOX). Plasma membrane fractions of high purity were isolated by aqueous two-phase partition and assayed directly. The NADH oxidase activity of the plasma membranes for the susceptible cell line was maximally inhibited by 1 microM adriamycin whereas the NADH oxidase activity of the tolerant lines was less and was maximally inhibited by 0.1 microM adriamycin with 1 and 10 microM adriamycin being less inhibitory than 0.1 microM adriamycin. The findings suggest a relationship between the growth response to adriamycin of the adriamycin tolerant mesothelioma lines and the activity of the plasma membrane-associated NADH oxidase activity of the cell surface in these cell lines.

Antineoplastic Agents↗

PubMed2002

Biochemical basis for the biological clock.

NADH oxidases at the external surface of plant and animal cells (ECTO-NOX proteins) exhibit stable and recurring patterns of oscillations with potentially clock-related, entrainable, and temperature-compensated period lengths of 24 min. To determine if ECTO-NOX proteins might represent the ultradian time keepers (pacemakers) of the biological clock, COS cells were transfected with cDNAs encoding tNOX proteins having a period length of 22 min or with C575A or C558A cysteine to alanine replacements having period lengths of 36 or 42 min. Here we demonstrate that such transfectants exhibited 22, 36, or 40 to 42 h circadian patterns in the activity of glyceraldehyde-3-phosphate dehydrogenase, a common clock-regulated protein, in addition to the endogenous 24 h circadian period length. The fact that the expression of a single oscillatory ECTO-NOX protein determines the period length of a circadian biochemical marker (60 X the ECTO-NOX period length) provides compelling evidence that ECTO-NOX proteins are the biochemical ultradian drivers of the cellular biological clock.

Amino Acid Substitution↗