Abstract:
:In this report we describe results showing that both arachidonic acid (20:4) release and prostaglandin (PG) synthesis in herpes simplex virus type 2 (HSV-2)-transformed tumor-derived rat fibrosarcoma (RFS) cells are inhibited by indomethacin (cyclooxygenase inhibitor). These data suggest that cyclooxygenase (prostaglandin endoperoxide synthetase, PES) and phospholipase are coupled in their regulation in RFS cells. Data obtained using a cell-free assay to measure directly cyclooxygenase specific activity in the absence of phospholipase activity indicate that constitutive cyclooxygenase activity is very low in non-transformed REF and is not induced by 12-O-tetradecanoylphorbol-13-acetate (TPA). In contrast, after an initial degradation of constitutive enzyme, cyclooxygenase is synthesized de novo following TPA treatment of HSV-2-transformed RFS clonal cells. At least a 5-fold induction of cyclooxygenase occurs by 6 h post-treatment of HSV-2-transformed RFS clonal cells. This induction is inhibited by pretreatment of cells with cycloheximide (protein synthesis inhibitor) 1 h prior to TPA treatment. Results obtained following delayed addition of cycloheximide to cells after TPA treatment indicate that the newly synthesized cyclooxygenase has a half-life of approximately 5 min. In addition, HSV-2-transformed RFS clonal cells at low passage (less than 10) show over a 3-fold greater increase in cyclooxygenase specific activity after TPA treatment compared to that in TPA-treated high passage (greater than 20) cells, suggesting that induction of high levels of PG synthesis is transient in these cells. These data indicate that HSV-2 transformation of REF cells is associated with alteration of cyclooxygenase regulation.
journal_name
Carcinogenesisjournal_title
Carcinogenesisauthors
Heitman CR,Waite M,Kucera LSdoi
10.1093/carcin/10.11.2059subject
Has Abstractpub_date
1989-11-01 00:00:00pages
2059-65issue
11eissn
0143-3334issn
1460-2180journal_volume
10pub_type
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