RESUMO
The renin-angiotensin system is an important modulator of arterial blood pressure and inhibitors of the angiotensin-converting enzyme (ACE-Is) and are currently used in the treatment of hypertension. The pleiotropic actions exerted by angiotensin II (AngII) on the functionality of the vessel wall may have pro-atherosclerotic outcomes; evidence for an anti-atherosclerotic effect of ACE-Is has been presented and an antioxidant effect has been attributed to thiol-containing ACE-Is, like Captopril. The present study has been undertaken to investigate the effect of Delapril, a lipophilic ACE-I, on the development of atherosclerosis in cholesterol-fed rabbits. While it did not correct hyperlipidemia, Delapril dose dependently inhibited the development of atherosclerosis, expressed as aortic area covered by lesions (23.3+/-4.1, 21.3+/-2.4 and 18.5+/-3.3% with Delapril at the daily dose of 5, 10 and 20 mg/kg, respectively, versus 38.2%+/-6.4 for control animals) and its effect was similar to that of Captopril (14.5+/-5.1% at the daily dose of 25 mg/kg). Furthermore, Delapril partially and dose dependently restored endothelium-dependent relaxation, which is impaired in vessels from hypercholesterolemic animals (51.80+/-12.18, 59.74+/-5.16, 69.13+/-8.70 maximal percent relaxation versus 48.26+/-3.05% for the untreated control and 67.67+/-6.72% for Captopril-treated animals). An antioxidant mechanism is unlikely to explain this data, since Delapril does not contain thiol groups. These observations suggest that Delapril may represent an effective pharmacological approach for the treatment of atherosclerosis during its early phases.
Assuntos
Inibidores da Enzima Conversora de Angiotensina/farmacologia , Arteriosclerose/tratamento farmacológico , Endotélio Vascular/efeitos dos fármacos , Indanos/farmacologia , Inibidores da Enzima Conversora de Angiotensina/administração & dosagem , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , Animais , Aorta Abdominal/efeitos dos fármacos , Aorta Abdominal/patologia , Aorta Torácica/efeitos dos fármacos , Aorta Torácica/patologia , Arteriosclerose/induzido quimicamente , Arteriosclerose/patologia , Peso Corporal/efeitos dos fármacos , Captopril/administração & dosagem , Captopril/farmacologia , Colesterol/sangue , Colesterol na Dieta/administração & dosagem , HDL-Colesterol/sangue , HDL-Colesterol/efeitos dos fármacos , Interpretação Estatística de Dados , Dieta Aterogênica , Modelos Animais de Doenças , Progressão da Doença , Relação Dose-Resposta a Droga , Endotélio Vascular/fisiopatologia , Hipercolesterolemia/induzido quimicamente , Hipercolesterolemia/tratamento farmacológico , Hipercolesterolemia/patologia , Indanos/administração & dosagem , Indanos/uso terapêutico , Masculino , Óxido Nítrico/metabolismo , Nitroglicerina/administração & dosagem , Nitroglicerina/farmacologia , Norepinefrina/administração & dosagem , Norepinefrina/farmacologia , Coelhos , Triglicerídeos/sangue , Vasoconstritores/administração & dosagem , Vasoconstritores/farmacologia , Vasodilatação/efeitos dos fármacos , Vasodilatadores/administração & dosagem , Vasodilatadores/farmacologiaRESUMO
This paper describes a case of hemorrhage from an aortic leiomyosarcoma in which the patient exceptionally survived for 4.2 years after surgery. The operation consisted of resection of the aortic tract involved by the tumour and graft of a prosthesis. The diagnosis of aortic leiomyosarcoma had been based on the histological analysis and confirmed by histochemical and immunohistochemical findings.