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

Cyclopentenone prostaglandins PGA1 and PGJ2 induce growth arrest at the G1/S interphase of the cell cycle in tumour cell lines. Notably, PGE, the precursor molecule of PGA, downregulates the interleukin (IL)-2-dependent proliferation of lymphocytes. Therefore the IL-2/IL-2 receptor system and relative signal transduction is a possible target of the antiproliferative effect of PGA/PGJ. In the present study the PGA1/PGJ2-dependent growth inhibition of IL-2-stimulated primary human cord blood mononuclear cells (CBMCs) was found to be mediated by interference with the IL-2 proliferative signal. Both prostaglandins (PGs) inhibited the synthesis of total RNA and protein in IL-2 stimulated cells. PGA1 and even more PGJ2 downregulated the expression of IL-2 receptor alpha (CD25 phenotype). IL-2 partly reversed this effect. Moreover, suppression of IL-2-stimulated cells was not the result of PG-mediated activation of apoptosis. On the contrary, PGs reduced both apoptosis and the high expression of c-Jun detectable in CBMCs spontaneously. Cyclin A/Cdk2 complexes regulate G1/S transition during the cell cycle. In IL-2-stimulated cells, the levels of Cdk2 were found to be lower in PG-treated cells than those detected in controls. In conclusion, cyclopentenone PGs inhibit CBMCs spontaneous or IL-2-dependent proliferation in part by interfering with the IL-2 pathway.
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PMID:Functional antagonism between IL-2 and PGA1 or PGJ2 in the control of proliferation of human cord blood-derived mononuclear cells. 908 5

The serum activity of the enzyme adenosine desaminase (ADA) was studied in patients with infiltrative tuberculosis in relation to IL-1 beta, TNF-alpha, IL-2 productions, the magnitude of a lymphocytic proliferative response to PPD and PGA. There was an association of high ADA levels with the severity of a tuberculous process, with the least IL-2 production together with drastically increased IL1 beta and significant disorders in the TNF-alpha system. Moderate ADA increases reflect the regularly enhanced activity of immunocompetent cells in response to an infectious agent. The findings indicate that a simple biochemical test may be used for rapid preliminary evaluation of the severity of disease and immune performance.
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PMID:[Cytokine production-adenosine deaminase activity relationship in pulmonary tuberculosis]. 1090 Sep 84