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. 1993 Apr;91(4):1843–1849. doi: 10.1172/JCI116398

Enhanced prostacyclin synthesis in endothelial cells by retrovirus-mediated transfer of prostaglandin H synthase cDNA.

X M Xu 1, K Ohashi 1, S K Sanduja 1, K H Ruan 1, L H Wang 1, K K Wu 1
PMCID: PMC288168  PMID: 8473524

Abstract

A retroviral vector (BAG) was used to transfer human prostaglandin H synthase (PGHS-1) gene into a human endothelial cell line for enhancement of PGI2 synthesis. Cells infected with BAG containing PGHS-1 cDNA in the sense orientation relative to the retroviral promoter (PGHS(S)) expressed a 30-fold increase in mRNA but, due to a reading frame shift, did not show an increase in PGHS protein or in PGI2 synthesis, while those with PGHS-1 in reverse orientation relative to the viral promoter (PGHS(R)), produced a > 10-fold increase in PGHS mRNA over the control (169 +/- 22 vs 14.8 +/- 1.2 amol/micrograms RNA) with a concordant increase in PGHS protein (5.82 +/- 1.07 vs 0.23 +/- 0.04 ng/mg protein) and enzyme activity. Primer extension analysis of PGHS(R) revealed two transcription start sites located in the SV40 late promoter region adjacent to PGHS-1 cDNA. PGHS(R) cells produced a high basal PGI2 level which was increased by several-fold in response to stimulation by ionophore, arachidonic acid, and thrombin. Kinetic analysis revealed the PGI2 synthetic rate to be 14 ng/min-1 per million cells and t1/2 of PGI2 synthesis, 13.3 min. These findings indicate that transfer of PGHS-1 gene into vascular cells enhances PGI2 synthesis and may be a useful strategy for restoring thromboprotective property of damaged blood vessels.

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Selected References

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