Prenyltransferase inhibitors block superoxide production by pulmonary vascular smooth muscle.
We recently showed that the farnesyltransferase inhibitor FTI-277 blocks interleukin 1beta (IL-1beta)-induced nitric oxide production in pulmonary vascular smooth muscle cells (SMC), whereas the geranylgeranyltransferase inhibitor GGTI-298 enhances this effect. Here we show that IL-1beta and platelet-derived growth factor (PDGF) stimulate superoxide production by pulmonary vascular SMC and that this effect is blocked by both FTI-277 and GGTI-298, suggesting that farnesylated and geranylgeranylated proteins are required for superoxide production. We also show that FTI-277 and GGTI-298 block superoxide production stimulated by constitutively active mutant H-Ras. Furthermore, superoxide production by IL-1beta, PDGF factor, and constitutively activated Ras is blocked by diphenyleneiodonium, implicating NAD(P)H oxidase as the generating enzyme. Given the role of oxidant radicals in vascular reactivity and injury, the action of both FTI-277 and GGTI-298 in suppressing superoxide generation by an inflammatory cytokine as well as by a potent smooth muscle mitogen may be therapeutically useful.
Boota
A
A
Department of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
Johnson
B
B
Lee
K L
KL
Blaskovich
M A
MA
Liu
S X
SX
Kagan
V E
VE
Hamilton
A
A
Pitt
B
B
Sebti
S M
SM
Davies
P
P
D000818:Animals; D001549:Benzamides / Q000494:pharmacology; D002478:Cells, Cultured; D004122:Dimethylallyltranstransferase / Q000037:antagonists & inhibitors*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D011905:Genes, ras / Q000235:genetics; D007375:Interleukin-1 / Q000494:pharmacology; D008297:Male; D008715:Methionine / Q000031:analogs & derivatives / Q000494:pharmacology; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000378:metabolism*; D009154:Mutation / Q000502:physiology; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D011652:Pulmonary Circulation / Q000502:physiology*; D051381:Rats; D013481:Superoxides / Q000037:antagonists & inhibitors* / Q000378:metabolism; D014162:Transfection
D001549:Benzamides; D004791:Enzyme Inhibitors; C096856:FTI 277; C102521:GGTI 298; D007375:Interleukin-1; D010982:Platelet-Derived Growth Factor; D013481:Superoxides; D008715:Methionine; D004122:Dimethylallyltranstransferase