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Virology Journal 2007-Sep

Kaposi's sarcoma associated herpesvirus G-protein coupled receptor activation of cyclooxygenase-2 in vascular endothelial cells.

Straipsnius versti gali tik registruoti vartotojai
Prisijungti Registracija
Nuoroda įrašoma į mainų sritį
Bryan D Shelby
Heather L LaMarca
Harris E McFerrin
Anne B Nelson
Joseph A Lasky
Gang Sun
Leslie Myatt
Margaret K Offermann
Cindy A Morris
Deborah E Sullivan

Raktažodžiai

Santrauka

BACKGROUND

Kaposi's sarcoma associated herpesvirus (KSHV) is the etiologic agent of Kaposi's sarcoma (KS), a highly vascularized neoplasm characterized by endothelial-derived spindle-shaped tumor cells. KSHV-infected microvascular endothelial cells demonstrate increased cyclooxygenase-2 (COX-2) expression and KS lesions have high levels of prostaglandin E2 (PGE2), a short-lived eicosanoid dependent on cyclooxygenase activity that has been linked to pathogenesis of other neoplasias. To determine whether increased COX-2 expression and PGE2 production is mediated by the angiogenic and tumorigenic KSHV-encoded G-protein coupled receptor (vGPCR), we developed a recombinant retrovirus to express vGPCR in Human Umbilical Vascular Endothelial Cells (HUVEC).

RESULTS

In the present study, we show that vGPCR-expressing HUVEC exhibit a spindle-like morphology that is characteristic of KS endothelial cells and demonstrate selective induction of PGE2 and COX-2. By treating vGPCR-expressing HUVEC with selective and non-selective COX inhibitors, we show that vGPCR-induced PGE2 production is dependent on the expression of COX-2 but not COX-1.

CONCLUSIONS

Taken together, these results demonstrate that vGPCR induces expression of COX-2 and PGE2 that may mediate the paracrine effects of this key viral protein in KS pathogenesis.

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