In vivo stimulatory effect of erythropoietin on endothelial nitric oxide synthase in cerebral arteries.
The discovery of tissue protective effects of erythropoietin has stimulated significant interest in erythropoietin (Epo) as a novel therapeutic approach to vascular protection. The present study was designed to determine the cerebral vascular effects of recombinant Epo in vivo. Recombinant adenoviral vectors (10(9) plaque-forming units/animal) encoding genes for human erythropoietin (AdEpo) and beta-galactosidase (AdLacZ) were injected into the cisterna magna of rabbits. After 48 h, basilar arteries were harvested for analysis of vasomotor function, Western blotting, and measurement of cGMP levels. Gene transfer of AdEpo increased the expressions of recombinant Epo and its receptor in the basilar arteries. Arteries exposed to recombinant Epo demonstrated attenuation of contractile responses to histamine (10(-9) to 10(-5) mol/l) (P < 0.05, n = 5). Endothelium-dependent relaxations to acetylcholine (10(-9) to 10(-5) mol/l) were significantly augmented (P < 0.05, n = 5), whereas endothelium-independent relaxations to a nitric oxide (NO) donor 2-(N,N-diethylamino)diazenolate-2-oxide sodium salt remained unchanged in AdEpo-transduced basilar arteries. Transduction with AdEpo increased the protein expression of endothelial NO synthase (eNOS) and phosphorylated the S1177 form of the enzyme. Basal levels of cGMP were significantly elevated in arteries transduced with AdEpo consistent with increased NO production. Our studies suggest that in cerebral circulation, Epo enhances endothelium-dependent vasodilatation mediated by NO. This effect could play an important role in the vascular protective effect of Epo.
Santhanam
Anantha Vijay R
AV
Department of Anesthesiology, Mayo Clinic College of Medicine, 200 First St. SW, Rochester, MN 55905, USA.
Smith
Leslie A
LA
Nath
Karl A
KA
Katusic
Zvonimir S
ZS
D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D015153:Blotting, Western; D002536:Cerebral Arteries / Q000187:drug effects / Q000201:enzymology*; D000242:Cyclic AMP / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D004730:Endothelium, Vascular / Q000502:physiology; D004921:Erythropoietin / Q000235:genetics / Q000494:pharmacology*; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D006632:Histamine / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D007763:Lac Operon / Q000235:genetics; D008297:Male; D020030:Nitric Oxide Donors; D052250:Nitric Oxide Synthase Type III / Q000378:metabolism*; D011817:Rabbits; D011994:Recombinant Proteins; D013268:Stimulation, Chemical; D014161:Transduction, Genetic; D014664:Vasodilation / Q000187:drug effects / Q000502:physiology; D001616:beta-Galactosidase / Q000235:genetics
D020030:Nitric Oxide Donors; D011994:Recombinant Proteins; D004921:Erythropoietin; D006632:Histamine; D000242:Cyclic AMP; D052250:Nitric Oxide Synthase Type III; D001616:beta-Galactosidase; D006152:Cyclic GMP