Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P00790 (PGA)
 2,475 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Cyclopentenone prostaglandins (PGs) such as delta 12-PGJ2 and PGA are potent inducers of growth inhibition in a variety of cultured cells, including epidermal cells. These PGs are actively transported into cells by a specific carrier on cell membrane and accumulate in cell nuclei with binding to nuclear protein. To clarify the mechanism of cytotoxicity of these PGs in epidermal cells, we examined the effects of delta 12-PGJ2 on protein synthesis and cytoskeleton in the PAM 212 transformed mouse epidermal cell line. Cycloheximide at 1 microgram/ml culture medium exhibited a protective effect on cell growth inhibition of PAM 212 cells by delta 12-PGJ2. The analysis of cell lysate protein patterns by SDS-polyacrylamide gel electrophoresis revealed that 12-h incubation with delta 12-PGJ2 increased the amount of 70 kD protein in PAM 212 cells. The amount of 70 kD protein in delta 12-PGJ2-treated cells was markedly decreased by cotreatment with cycloheximide. This 70 kD protein was also induced in PAM 212 cells with treatment at 43 degrees C for 90 min, indicating that this synthesized protein belongs to the heat shock protein. The addition of delta 12-PGJ2 to confluent PAM 212 cells resulted in the disappearance of action filament, as visualized by fluorescent labeled phallacidine, but in contrast, keratin filament appeared to be intact during 12-h incubation with delta 12-PGJ2 at a concentration of 5 micrograms/ml culture medium. These results suggest that the cytotoxicity of cyclopentenone PGs is at least in part due to induction of the synthesis of some protein(s), probably one of the heat shock proteins, and the damage to the actin filament in transformed cultured epidermal cells.
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PMID:Effects of cytotoxic prostaglandin, delta 12-PGJ2 on protein synthesis and cytoskeleton in transformed epidermal cells in culture. 169 39

Previously we described the simultaneous quantification of DNA and nuclear protein in unfixed tissue from solid tumors. The resultant 2 parameter flow cytometric analysis has several advantages over that of DNA alone. In this report, we describe a modification of the technique for the analysis of formalin-fixed paraffin-embedded tissue. Paraffin-embedded material was prepared by hydrating sections, incubating in 0.5% pepsin solution, washing, and resuspending in buffer containing nonionic detergent. The nuclei were then stained with fluorescein isothiocyanate and propidium iodide in the presence of ribonuclease. Several solid tumor tissue types have been analyzed, including breast, colon, kidney, and thymus. The best results were obtained when the initial pepsin treatment was for 1.5 h, instead of 0.5 h. Pepsin treatment for 1.5 h improved the CVs of both the DNA and nuclear protein parameters, and did not appear to reduce nuclear protein levels or to cause significant disintegration of nuclei. The DNA/nuclear protein histograms of unfixed and fixed, paraffin-embedded tissue were similar. Since tumor nuclei typically have higher protein levels than DNA-diploid nuclei, the technique reduces population overlapping and permits less subjective identification of DNA aneuploidy.
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PMID:Flow cytometric analysis of DNA and nuclear protein in paraffin-embedded tissue. 844 Jan 53