[Effect of cAMP on the function of endothelial cells and fibromuscular proliferation after the injury of the carotid and coronary arteries in a porcine model].
OBJECTIVE
Reendothelization of damaged blood vessels protects against the vascular injury response. We evaluated in vivo whether a systemic increase in cAMP accelerates reendothelization and attenuates intimal hyperplasia in injured swine carotid and coronary arteries.


METHODS
Both carotid arteries of 10 swines were subjected to balloon injury. Five animals had been treated with 2 ml (10 mg) of Forskolin, an activator of the adenylate cyclase, and another 5 with 2 ml of saline solution. These animals were sacrificed at day 8, and carotid artery reendothelization was evaluated. The descendent coronary (DC) artery of another 19 pigs was injured by atherotome. Nine animals had been treated with 2 ml of Forskolin, and another 10 with 2 ml of saline solution. These animals were sacrificed at day 28, with myointimal proliferation and arterial geometric remodelation being evaluated. Likewise, in these animals intracellular cAMP levels were measured at baseline and 28 and 60 minutes after saline solution or Forskolin administration and 90 min after arterial injury.


RESULTS
Eight days after balloon injury, carotid artery reendothelization was greater in the Forskolin-treated group compared with the control group (p = 0.02), and the number of CD31 positive cells was statistically increased in the treated group (38 +/- 11 cells) versus controls (11 +/- 9 cells). Although the degree of vascular injury caused by atherotome was similar in all of the arteries in the control group, restenosis was only observed in 40% of these animals. Correlation analysis demonstrated that intracellular cAMP may condition arterial geometric remodeling and the diameter of the lumen after vascular injury.


CONCLUSIONS
Our results suggest that cAMP may promote reendothelization and attenuate fibromuscular proliferation.
Fantidis
P
P
Servicios de Cardiología Intervencionista, Hospital Clinico San Corlos, Madrid. pfantidis@hcsc.insalud.es
Fernández-Ortiz
A
A
Aragoncillo
P
P
Pérez De Prada
T
T
Sanmartín
M
M
López
J
J
Sabaté
M
M
Escaned
J
J
Alfonso
F
F
Hernández
R
R
Bañuelos
C
C
Macay
C
C
D000818:Animals; D020212:Carotid Artery Injuries / Q000378:metabolism / Q000473:pathology*; D002404:Catheterization / Q000009:adverse effects*; D002455:Cell Division; D005576:Colforsin / Q000494:pharmacology; D003331:Coronary Vessels / Q000166:cytology* / Q000293:injuries / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism / Q000502:physiology*; D004730:Endothelium, Vascular / Q000166:cytology* / Q000293:injuries / Q000378:metabolism; D023421:Models, Animal; D012008:Recurrence; D013552:Swine; D014654:Vascular Patency
D005576:Colforsin; D000242:Cyclic AMP