RESUMO
Angiotensin-converting enzyme (ACE) activity and polymorphism contribute significantly to the prognosis of patients with cardiomyopathy. The aim of this study was to determine the activity and type of ACE polymorphism in patients with familial and nonfamilial hypertrophic cardiomyopathy (HCM) and to correlate these with echocardiographic measurements (echo-Doppler). We studied 136 patients (76 males) with HCM (69 familial and 67 nonfamilial cases). Mean age was 41 ¡À 17 years. DNA was extracted from blood samples for the polymerase chain reaction and the determination of plasma ACE levels. Left ventricular mass, interventricular septum, and wall thickness were measured. Mean left ventricular mass index, interventricular septum and wall thickness in familial and nonfamilial forms were 154 ¡À 63 and 174 ¡À 57 g/m2 (P = 0.008), 19 ¡À 5 and 21 ¡À 5 mm (P = 0.02), and 10 ¡À 2 and 12 ¡À 3 mm (P = 0.0001), respectively. ACE genotype frequencies were DD = 35%, ID = 52%, and II = 13%. A positive association was observed between serum ACE activity and left ventricular mass index (P = 0.04). Logistic regression showed that ACE activity was twice as high in patients with familial HCM and left ventricular mass index ¡Ý190 g/m2 compared with the nonfamilial form (P = 0.02). No other correlation was observed between ACE polymorphisms and the degree of myocardial hypertrophy. In conclusion, ACE activity, but not ACE polymorphisms, was associated with the degree of myocardialhypertrophy in the patients with HCM.
Assuntos
Adulto , Feminino , Humanos , Masculino , Cardiomiopatia Hipertrófica/enzimologia , Peptidil Dipeptidase A/genética , Peptidil Dipeptidase A/metabolismo , Polimorfismo Genético/genética , Cardiomiopatia Hipertrófica Familiar/enzimologia , Cardiomiopatia Hipertrófica Familiar/genética , Cardiomiopatia Hipertrófica Familiar , Cardiomiopatia Hipertrófica/genética , Cardiomiopatia Hipertrófica , Ecocardiografia Doppler , Genótipo , Hipertrofia Ventricular Esquerda , Fenótipo , Índice de Gravidade de DoençaRESUMO
Some Brazilian regions are considered to be endemic for human T-cell leukemia/lymphoma virus type I (HTLV-I) infection. Several studies have shown a high prevalence of HTLV-I infection among different groups such as blood donors, hemophiliacs and patients suffering from hematological and neurological diseases. Cases of adult T -cell leukemia/lymphoma as well as tropical spastic paraparesis/HTLV-i-infected T -cell line (ROB) expressing viral antigens was established and reverse transcriptase activity could be detected in the culture supernatant. Ultrastructural analysis showed immature and mature HTLV retrovirus particles. Finally, HTLV-I provirus type I was demonstrated by the plymerase chain reaction. This is the first isolation completely carried out in Latin America. The molecular analysis of viral strains, now in progress, should clarify the molecular epidemiology of HTLV-I in Brazil