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1.
Ann Endocrinol (Paris) ; 65(5): 439-50, 2004 Oct.
Artigo em Francês | MEDLINE | ID: mdl-15550886

RESUMO

The QLS-H(c) (Questions on Life Satisfaction- Hypopituitarism) is new a quality of life (QoL) self-administered questionnaire addressing the complaints of adult patients with growth hormone deficiency. The French version of the QLS-H(c) (16 items) has been psychometrically evaluated during a randomized, open label study comparing two strategies of growth hormone (GH) replacement therapy. Seventy-three patients were included and received an 8-month GH replacement therapy. QoL was explored at baseline, 4 and 8 months using the QLS-H(c) questionnaire and the Nottingham Health Profile (NHP) reference scale. Acceptance of the QLS-H(c) was excellent as 92% of the questionnaires were suitable for analysis. All the items demonstrated good selectivity. The homogeneity of the questionnaire was confirmed (Cronbach's alpha, 0.87). The external validity construct was assessed and confirmed using the NHP scores. Sensitivity to change was confirmed. Following an 8-month replacement therapy, the perception of the QoL assessed with the QLS-H(c) questionnaire was significantly improved, irrespective to the treatment strategy. Finally, redundant items of the questionnaire were removed. As a result, the final version of the QLS-H(c) contained 9 items. In a parallel study, reference data of the QLS-H(c) (9 items) were collected from a representative sample of 989 subjects from the French population. With these reference ranges, algorithms to calculate Z scores adjusted for age and gender were developed as a measure for the deviation of patients' scores from those of the general population, and also to evaluate changes along time. In summary, the French version of the quality of life QLS-H(c) questionnaire is a relevant, validated investigational tool for the evaluation and follow-up of an adult patient with growth hormone deficiency.


Assuntos
Hormônio do Crescimento Humano/deficiência , Hormônio do Crescimento Humano/uso terapêutico , Qualidade de Vida , Inquéritos e Questionários , Adulto , Feminino , França , Terapia de Reposição Hormonal , Humanos , Idioma , Masculino , Pessoa de Meia-Idade , Psicometria , Ensaios Clínicos Controlados Aleatórios como Assunto , Valores de Referência
3.
J Clin Endocrinol Metab ; 86(9): 4529-35, 2001 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11549703

RESUMO

Alterations of the gene encoding the pituitary transcription factor PROP1 were associated with congenital forms of multiple pituitary hormone deficiencies in several families. Among 23 patients with multiple pituitary hormone deficiencies screened for a PROP1 gene abnormality, nine belonging to eight unrelated families had homozygous PROP1 gene defects. All mutations were located in exon 2 and affected only two different sites: a homozygous AG deletion at codons 99/100/101 (n = 5); homozygous point mutations affecting codon 73: R73C (n = 2) or R73H (n = 1), and a R73C/R99X double-heterozygous mutation (n = 1). R73H and R99X were never described. All patients were born to unaffected parents, and consanguinity was documented in two patients. They had complete GH, LH-FSH, and TSH deficiencies and normal basal levels of PRL. Delayed ACTH deficiency was diagnosed in four of nine patients. At magnetic resonance imaging the anterior pituitary was hypoplastic in seven patients and hyperplastic in two. This study found two novel mutations (R73H and R99X) and underlines the high incidence of PROP1 gene alterations in patients with multiple pituitary hormone deficiencies. A corticotroph deficiency was frequently observed in association with GH, TSH, and gonadotropin deficiencies and should be carefully sought during follow-up.


Assuntos
Hormônio Adrenocorticotrópico/deficiência , Proteínas de Homeodomínio/genética , Hipófise/fisiologia , Hormônios Hipofisários/deficiência , Hormônios Hipofisários/genética , Fatores de Transcrição/genética , Adolescente , Adulto , Criança , DNA/análise , DNA/genética , Feminino , França , Testes Genéticos , Genoma , Humanos , Imageamento por Ressonância Magnética , Masculino , Mutação/genética , Fenótipo , Polimorfismo Genético/genética
5.
Am J Kidney Dis ; 37(4): 720-7, 2001 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-11273871

RESUMO

Experimental evidence suggests a role for obesity in the formation and progression of some glomerular lesions, but data for human glomerulonephritis are lacking. In a cohort of 162 incident patients with biopsy-proven immunoglobulin A (IgA) nephropathy, we assessed whether the presence of an elevated body mass index (BMI >/= 25 kg/m(2)) at the time of the first renal biopsy (RB1) correlated with clinical data at RB1 (24-hour proteinuria, arterial hypertension, and renal function), pathological data (global optical score [GOS] with detailed pathological indices), and clinical progression to both arterial hypertension and chronic renal failure (CRF). In both univariate and multivariate analyses, the presence of an elevated BMI at RB1 was significantly associated with the severity of pathological renal lesions (GOS and vascular, tubular, and interstitial indices). Hypertension-free survival was significantly less in overweight patients (P: < 0.0001) compared with those with normal weight. In a Cox regression analysis for hypertension-free survival including 24-hour proteinuria greater than 1 g, GOS, and metabolic parameters, only elevated BMI and GOS were independent factors for the development of arterial hypertension. CRF-free survival was also significantly less in patients with an excessive BMI. In a multivariate Cox regression analysis for CRF-free survival, hypertension, GOS, and BMI at RB1 were independent risk factors for CRF. In IgA nephropathy, excessive body weight and/or BMI are underestimated predictive factors for the development of arterial hypertension and, ultimately, CRF.


Assuntos
Peso Corporal , Glomerulonefrite por IGA/diagnóstico , Obesidade/diagnóstico , Adulto , Idade de Início , Índice de Massa Corporal , Comorbidade , Progressão da Doença , Feminino , Seguimentos , Glomerulonefrite por IGA/epidemiologia , Humanos , Hipertensão/diagnóstico , Hipertensão/epidemiologia , Falência Renal Crônica/diagnóstico , Falência Renal Crônica/epidemiologia , Masculino , Pessoa de Meia-Idade , Obesidade/epidemiologia , Proteinúria/diagnóstico , Proteinúria/epidemiologia , Fatores de Risco
6.
J Clin Endocrinol Metab ; 86(2): 797-803, 2001 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-11158049

RESUMO

The plasma lipolysis of triglyceride (TG)-rich lipoproteins is mainly due to the activity of lipoprotein lipase (LPL). Albeit important for our analysis of certain physiopathological situations, the determination of the magnitude of LPL-dependent lipolysis is not easy to perform. This essentially results from the binding of LPL to the luminal surface of vascular endothelium. The measurements of the whole putative LPL activity have been achieved after injection of heparin, a procedure that releases LPL from endothelium. However, the physiopathological relevance of this postheparin lipolysis assay (PHLA) remains questionable because it has never been demonstrated that the bulk of endothelium-bound LPL was active. It has been recently shown that a small part of LPL is associated to circulating lipoproteins in nonheparinized plasma, raising the possibility that the lipolysis mediated by this circulating LPL might reflect the overall LPL-dependent TG hydrolysis in plasma. To address this question, we developed a new lipolysis assay in which the very low density lipoprotein (VLDL)-bound LPL-dependent VLDL-TG hydrolysis (LVTH) was directly determined through the measurement of nonesterified fatty acid (NEFA) release during in vitro incubations. LVTH measurements were performed in control subjects, in type 2 diabetics, and in either heterozygous or homozygous LPL-deficient patients. In the latter group, LVTH values were extremely low. Those of heterozygous patients and of diabetics were similarly decreased by about 40% with respect to control group. Plasma TG concentrations exhibited an inverse relationship with LVTH level. In a subgroup of subjects, LVTH and PHLA were positively correlated and the inverse correlation of LVTH with plasma or VLDL-TG concentration was stronger than that obtained with PHLA. To further study the validity of this new assay, we measured LVTH in nine subjects who were studied for their catabolism of VLDL labeled with stable isotope. No relation was observed between the direct hepatic removal of VLDL and LVTH, whereas the latter was strikingly correlated with the rate of conversion of VLDL to intermediary density lipoprotein. Collective consideration of these findings strongly suggests that LVTH is a physiologically relevant index which could advantageously replace the measurements of PHLA in numerous physiopathological situations.


Assuntos
Diabetes Mellitus Tipo 2/sangue , Lipase Lipoproteica/sangue , Lipase Lipoproteica/genética , Lipoproteínas VLDL/metabolismo , Triglicerídeos/metabolismo , Adulto , Apolipoproteínas B/sangue , Diabetes Mellitus Tipo 2/enzimologia , Diabetes Mellitus Tipo 2/genética , Ácidos Graxos não Esterificados/sangue , Feminino , Heparina , Heterozigoto , Homozigoto , Humanos , Hidrólise , Cinética , Lipase Lipoproteica/deficiência , Masculino , Pessoa de Meia-Idade , Valores de Referência
7.
Diabetes Metab ; 27(4 Pt 2): S83-6, 2001 Sep.
Artigo em Francês | MEDLINE | ID: mdl-11787443

RESUMO

Epidemiological: higher coronary risk in female diabetic patients than in male diabetic patients. Physiopathological: disturbance of lipid metabolism and endothelial nitric oxide (NO) production, seen in both menopausal and diabetic subjects. Hormonal: hyperandrogenism and excessively high blood oestradiol levels in diabetic menopausal women in relation to non-diabetic menopausal women. HRT in menopausal diabetic women Efficacy against climacteric disorders and osteoporosis. No major risks since the effects on lipoproteins are not significant and there are some positive effects on hepatic glucose production during hyperinsulinaemic clamp, provided triglycerides are below 2 mmol/l. Relatively positive effects have been noted in cohort studies such as the Nurses' Health Study and in a study measuring carotid intima-media thickness, but marked bias occurred in recruitment. HRT and coronary disease in diabetic and non-diabetic women Harmful effects were noted, particularly in the HERS study, with a higher incidence of fatal and non-fatal thromboembolic and/or coronary events. Other studies are underway using both conjugated equine estrogens (Women's Health Initiative) and SERMs (raloxifen and tamoxifen).


Assuntos
Diabetes Mellitus/fisiopatologia , Terapia de Reposição de Estrogênios , Menopausa , Glicemia/metabolismo , Diabetes Mellitus/sangue , Diabetes Mellitus/terapia , Feminino , Humanos , Osteoporose Pós-Menopausa/prevenção & controle
8.
Diabetologia ; 43(11): 1346-52, 2000 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11126401

RESUMO

AIMS/HYPOTHESIS: Hypertriglyceridaemia is common in Type II (non-insulin-dependent) diabetes mellitus. Only subgroups of patient however have type V hyperlipidaemia. To investigate the coordination between genetic factors in the modulation of hypertriglyceridaemia in Type II diabetes, we studied three major modifier loci: apoC-III (both Sst-I and insulin-responsive element polymorphisms), apolipoprotein E genotypes and lipoprotein-lipase mutations. METHODS: We studied apoCIII gene polymorphisms, apolipoprotein E genotypes and lipoprotein-lipase gene mutations in 176 patients with Type II (non-insulin-dependent) diabetes mellitus, either normolipaemic (group N, n = 116), mildly hypertriglyceridaemic (group T, n = 28) or with a history of severe hypertriglyceridaemia (triglyceride > 15 g/l) (group H, n = 32). RESULTS: Mild hypertriglyceridaemia in Type II diabetes did not associate with any gene variants in this study. Severe hypertriglyceridaemia was, however, associated with the presence of the apoC-III S2 allele (50% of the patients in group H compared with 15.5 % in group N, p < 0.0001). Additionally this particular phenotype was associated with a low prevalence of the apo E3 allele (35.9% in group H vs 18.1 % in group N, p < 0.005) and a statistically significant over-representation of the E2E4 genotypes. Inactivating lipoprotein-lipase mutations were found in four patients (three heterozygotes, one homozygote), none was found in group N or T. Thus 68.7 % of group H patients (22/32) (vs 21.4 % in group T, p < 0.0005) were carriers of either S2 allele, lipoprotein-lipase mutants or E2E4 genotype with most lipoprotein-lipase mutants or E2E4 genotypes or both in the non-carriers for the S2 allele (6/7). CONCLUSION/INTERPRETATION: Our results strongly support the hypothesis that severe hyperlipaemia in Type II diabetes crucially depends on genetic factors which impair the clearance of triglyceride-rich lipoproteins.


Assuntos
Apolipoproteínas C/genética , Apolipoproteínas E/deficiência , Diabetes Mellitus Tipo 2/genética , Hipertrigliceridemia/genética , Lipase Lipoproteica/genética , Mutação , Polimorfismo Genético , Adulto , Idoso , Apolipoproteína C-III , Apolipoproteína E3 , Diabetes Mellitus Tipo 2/complicações , Feminino , Genótipo , Haplótipos , Humanos , Hipertrigliceridemia/complicações , Masculino , Pessoa de Meia-Idade , Polimorfismo de Fragmento de Restrição , Polimorfismo Conformacional de Fita Simples
9.
Diabetologia ; 43(8): 995-9, 2000 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-10990076

RESUMO

AIMS/HYPOTHESIS: Non-alcoholic steatohepatitis is frequent in Type II (non-insulin-dependent) diabetes mellitus and can lead to fibrosis and cirrhosis. The interindividual variability in the occurrence of nonalcoholic steatohepatitis suggests, however, a genetic modulation. Microsomal triglyceride transfer protein (MTP) is necessary for the assembly and secretion of VLDL and when the protein is not functional, such as in abetalipoproteinaemia, a steatohepatitis occurs. We therefore assessed the association between a functional polymorphism in the promoter region of MTP gene (-493 G/T) and the biological features of steatohepatitis in Type II diabetic patients. METHODS: We studied 271 patients with Type II diabetes. Determination of -493 G/T polymorphism was made by PCR-RFLP. Increased liver enzymes were used as surrogates of liver steatosis and alanine aminotransferase concentration was the outcome variable for the multivariate analysis. Liver ultrasonography was available for a subgroup of patients with newly diagnosed diabetes. RESULTS: The proportion of patients with increased alanine aminotransferase was higher in GG than in GT and TT subgroups (23%, 11% and 6%, respectively, p = 0.01). Additionally, patients with high alanine aminotransferase concentrations were more likely to be young (p = 0.01), male (p = 0.001), obese (p = 0.04) and have low HDL-cholesterol (p = 0.01). In multivariate analysis, the MTP genotype was independently associated with alanine aminotransferase concentration (p = 0.0023) as well as sex and body mass index but not HDL-cholesterol. CONCLUSION/INTERPRETATION: The -493 G/T MTP gene polymorphism is associated with biological surrogates of steatohepatitis in patients with Type II diabetes. The G allele which is responsible for a decrease in MTP gene transcription is prone to increase the intrahepatic triglycerides content, conferring by this a genetic susceptibility for steatohepatitis.


Assuntos
Proteínas de Transporte/genética , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/genética , Glicoproteínas , Hepatite Crônica/etiologia , Polimorfismo Genético , Regiões Promotoras Genéticas , Adulto , Idoso , Apolipoproteínas/genética , Proteínas de Transferência de Ésteres de Colesterol , Diabetes Mellitus Tipo 2/fisiopatologia , Feminino , França , Genótipo , Hepatite Crônica/genética , Hepatite Crônica/fisiopatologia , Humanos , Fígado/diagnóstico por imagem , Testes de Função Hepática , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase , Polimorfismo de Fragmento de Restrição , Ultrassonografia , População Branca
10.
Maturitas ; 37(2): 95-104, 2000 Dec 29.
Artigo em Inglês | MEDLINE | ID: mdl-11137328

RESUMO

OBJECTIVE: To assess the biological safety of four hormone replacement treatment (HRT) combinations in women with non insulin dependent diabetes mellitus (NIDDM) or impaired glucose tolerance (IGT). SUBJECTS AND METHODS: Randomized, double-blind, placebo-controlled trial to analyze the variation of fibrinogen, factor VII, PAI1, and TG blood levels in women (n=99), with NIDDM or IGT, receiving a 3-month course of either oral oestradiol (1 or 2 mg) combined with Chlormadinone Acetate 5 mg, or transdermal oestradiol 50 microg/24 h in association with Norethisterone Acetate (11.2 or 22.4 mg), or placebo. Follow-up lasted 3 months. RESULTS: Ninety nine patients, mean age 56 years (SD 5), mean diabetes duration 7 years (S.D. 7), mean glycated hemoglobin (7.3%) were enrolled. There was no significant difference between the groups for any of the primary hemostasis criteria (n=77). Triglycerides (TG) variation significantly differed between groups, P=0.01, from -21% in the large patch group, to +22% in the placebo group (n=82). Treatment administration routes did not significantly differ for any of the criteria. There was a significant difference in the total cholesterol variation between groups, from +8.7% in the placebo group to -10.8% in the oral 1 mg group (P=0.001). CONCLUSION: The treatments had no highly deleterious effect in these patients with NIDDM or with IGT. Long-term trials can be performed with such patients, and an hormone treatment can be prescribed to relieve symptoms. Since these patients had a well-controlled NIDDM, results might be different in less well-controlled diabetes. The data do not support the hypothesis of an impaired oestrogen effect in patients with NIDDM.


Assuntos
Diabetes Mellitus Tipo 2/sangue , Estrogênios/uso terapêutico , Intolerância à Glucose/sangue , Terapia de Reposição Hormonal/métodos , Biomarcadores/sangue , Acetato de Clormadinona/administração & dosagem , Método Duplo-Cego , Quimioterapia Combinada , Estrogênios/administração & dosagem , Estrogênios/efeitos adversos , Feminino , Terapia de Reposição Hormonal/efeitos adversos , Humanos , Consentimento Livre e Esclarecido , Pessoa de Meia-Idade , Noretindrona/administração & dosagem , Noretindrona/análogos & derivados , Acetato de Noretindrona , Pós-Menopausa/sangue
11.
J Lipid Res ; 40(12): 2333-9, 1999 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-10588959

RESUMO

In recent years, it has been established that lipoprotein lipase (LPL) is partly associated with circulating lipoproteins. This report describes the effects of physiological amounts of very low density lipoprotein (VLDL)-bound LPL on the cholesteryl ester transfer protein (CETP)-mediated cholesteryl ester transfer (CET) from high density lipoprotein (HDL) to VLDL. Three patients with severe LPL deficiency exhibited a strong decrease in net mass CET that was more than 80% lower than that of common hypertriglyceridemic subjects. Recombination experiments showed that this was due to an abnormal behavior of the VLDL fraction. Replacement of the latter by normal VLDL totally normalized net mass CET. We therefore prepared VLDL containing controlled amounts of bound LPL that we used as CE acceptors in experiments involving unidirectional radioisotopic CET measurements. These were carried out either in the absence or in the presence of inhibitors of LPL lipolytic activity. When LPL-induced lipolysis was totally blocked, the stimulating effect of the enzyme on the CETP-dependent CET was only reduced by about 50%, showing that it did not entirely result from its lipolytic action. These data were dependent upon neither the type of LPL inhibitor (E600 or THL) nor the source of CETP (delipidated plasma or partially purified CETP). Thus, in addition to the well-known stimulating effect of LPL-dependent lipolysis on CET, our work demonstrates that physiological amounts of VLDL-bound LPL may facilitate CET through a mechanism partially independent of its lipolytic activity.


Assuntos
Proteínas de Transporte/metabolismo , Ésteres do Colesterol/metabolismo , Glicoproteínas , Lipase Lipoproteica/metabolismo , Lipoproteínas HDL/metabolismo , Lipoproteínas VLDL/metabolismo , Animais , Bovinos , Proteínas de Transferência de Ésteres de Colesterol , Guanidina/farmacologia , Humanos , Hipertrigliceridemia/metabolismo , Cinética , Lipase Lipoproteica/antagonistas & inibidores , Lipase Lipoproteica/deficiência , Lipase Lipoproteica/efeitos dos fármacos
12.
Therapie ; 54(3): 393-5, 1999.
Artigo em Francês | MEDLINE | ID: mdl-10500457

RESUMO

In the woman, lipoprotein plasma concentrations vary according to ovarian function. In general, menopause induces variations in lipoprotein plasma concentrations which are related to an increase in cardiovascular risk. Oestrogen therapy increases the synthesis of all lipoproteins including ApoB and increases the rate of their metabolism in various degrees depending on the type of lipoprotein. Globally, under oestrogen treatment, LDL cholesterol is decreased and HDL cholesterol is increased--more specifically HDL 2 and Lp A1 fractions. Oestrogens alter the lipoprotein metabolism through numerous mechanisms. New drugs such as Selective Oestrogen Receptor Modulators or phytoestrogens act on lipid metabolism: these effects could be useful in clinical practice.


Assuntos
Terapia de Reposição de Estrogênios , Estrogênios/fisiologia , Lipoproteínas/sangue , Estrogênios/farmacologia , Feminino , Humanos , Menopausa , Ovário/fisiologia
14.
J Clin Endocrinol Metab ; 84(4): 1329-33, 1999 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-10199774

RESUMO

An increased carotid arterial intima-media thickness (IMT) has been reported in hypopituitary adults untreated for GH deficiency. In the present study, the effect of GH replacement on IMT and cardiovascular risk factors was prospectively investigated, in GH deficiency patients treated at a mean dose of 1 UI/day during 1 yr (n = 22) and 2 yr (n = 11). The IMT measurements were performed by the same experienced physician, and the coefficient of variation (calculated in two control groups) was below 6.5%. IMT at baseline was related to conventional risk factors. After 1 yr GH treatment, IMT decreased from 0.78 +/- 0.03 mm to 0.70 +/- 0.03 mm (P < 0.001). The decrement was observed in 21 of 22 patients. After 2 yr GH treatment, IMT had stabilized at 0.70 +/- 0.04 mm and remained significantly different from baseline values (P < 0.003). GH treatment resulted in a moderate decrease in waist circumference and body fat mass and an increase in VO2 max. Conventional cardiovascular risk factors were unmodified except for a transient 10% decrease in low-density lipoprotein cholesterol at 6 months. The contrast between the limited metabolic effect of treatment and the importance and precocity of the changes in IMT suggests that the decrease in IMT was not exclusively attributable to a reversal in the atherosclerotic process. A direct parietal effect of GH replacement on the arterial wall might also be involved. The consequences, in terms of cardiovascular risk, should be established by randomized prospective trials.


Assuntos
Artérias Carótidas/efeitos dos fármacos , Terapia de Reposição Hormonal/efeitos adversos , Hormônio do Crescimento Humano/deficiência , Túnica Íntima/efeitos dos fármacos , Adulto , Composição Corporal/efeitos dos fármacos , Artérias Carótidas/patologia , LDL-Colesterol/sangue , Feminino , Hormônio do Crescimento Humano/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Fatores de Risco , Túnica Íntima/patologia
15.
Rev Prat ; 49(1): 30-3, 1999 Jan 01.
Artigo em Francês | MEDLINE | ID: mdl-9926713

RESUMO

Follow up in type 2 diabetes must be regular with an annual check-up and pluriannual consultations of adapted frequency. It's important to consider the diabetic patient in totality: reaching the previous objectives of weight and glycaemia, all vascular risk factors and evolution to complications. Some tests are necessary (retin exam, microalbuminuria, ECG...), but with an attentive clinic exam we can avoid many useless and expensive paraclinic explorations. It's also a motivation tool for patients.


Assuntos
Assistência ao Convalescente/métodos , Diabetes Mellitus Tipo 2/metabolismo , Diabetes Mellitus Tipo 2/prevenção & controle , Automonitorização da Glicemia , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/diagnóstico , Humanos , Exame Físico , Encaminhamento e Consulta , Fatores de Risco
16.
J Clin Endocrinol Metab ; 84(2): 541-5, 1999 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-10022413

RESUMO

Severe obesity exposes one to an increased risk of cardiovascular mortality. Gastroplasty has been shown to induce substantial weight loss and to improve the atherogenic profile of severely obese subjects. However, vitamin deficiencies after gastroplasty have been reported. Because hyperhomocysteinemia, an independent risk factor for cardiovascular disease, is influenced by nutritional status (and especially by folate intake), we hypothesized that a marginal folate deficiency induced by gastroplasty could promote hyperhomocysteinemia. Thus, plasma homocysteine concentrations were measured by high-performance liquid chromatography in 53 severely obese patients (body mass index = 42 +/- 1), before and 1 yr after vertical gastroplasty. Plasma homocysteine concentrations increased, on an average, from 9.9 +/- 0.4 to 12.8 +/- 0.6 micromol/L (P < 0.0001). This increase in homocysteine levels was observed in two thirds of the subjects, leading to clear-cut hyperhomocysteinemia (>15 micromol/L) in 32%. The changes in homocysteine concentrations were correlated to weight loss (P < 0.001) and to decrease in plasma folate concentrations (P < 0.01). Whereas gastroplasty induced a mean 32-kg weight loss and a striking improvement in conventional risk factors, the occurrence of iatrogenic hyperhomocysteinemia might hamper the benefit of surgery on cardiovascular risk in most of the patients. Our results further support use of a systematic efficient folate supplementation after gastroplasty.


Assuntos
Gastroplastia/efeitos adversos , Homocisteína/sangue , Obesidade/sangue , Obesidade/cirurgia , Adulto , Glicemia/metabolismo , Doenças Cardiovasculares/etiologia , Doenças Cardiovasculares/prevenção & controle , HDL-Colesterol/sangue , Feminino , Ácido Fólico/sangue , Humanos , Insulina/sangue , Lipoproteína(a)/sangue , Masculino , Estado Nutricional , Fatores de Risco , Triglicerídeos/sangue , Redução de Peso
17.
J Lipid Res ; 40(1): 133-9, 1999 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-9869659

RESUMO

High density lipoprotein (HDL)-associated paraoxonase (PON) seems to play a major role in the protection of low density lipoprotein (LDL) against peroxidation by HDL, and the partly purified enzyme exerts a dose-dependent protective effect. A common polymorphism of the human gene (192 Q-->R) modulates paraoxonase activity but purified enzyme from either genotype is equally effective against LDL peroxidation. The inhibition of Cu2+-induced LDL peroxidation by HDL was monitored by lipid peroxide assay and change in LDL electrophoretic mobility. We show that HDL from type 2 diabetic patients with the QQ or RR genotype (n = 12 for each) reduce, to the same extent, both peroxide production (by 60.6 +/- 20.0 and 63.9 +/- 23.5%) and relative change in mobility (61.3 +/- 21.8 and 61.4 +/- 26.5%) despite a 6-fold difference in paraoxonase activity (47.4 +/- 4.4 vs. 299.7 +/- 23.7 U/l, P < 0.0001). Protection was, however, related to paraoxonase activity, but with a different efficiency in each group corresponding to a better protection per unit of enzyme in the QQ genotype group. Inactivation of PON activity by heating (56 degreesC, 10 min) or by EDTA was totally without effect on protection, which remained correlated with the paraoxonase activity measured prior to inactivation. In summary, these results suggest that the protein bearing both paraoxonase and arylesterase activities also possesses a third thermostable property, closely associated with paraoxon hydrolysis activity and unaffected by PON genetic variability.


Assuntos
Esterases/genética , Esterases/metabolismo , Peroxidação de Lipídeos , Lipoproteínas LDL/metabolismo , Paraoxon/metabolismo , Polimorfismo Genético , Arildialquilfosfatase , Hidrolases de Éster Carboxílico/genética , Hidrolases de Éster Carboxílico/metabolismo , Cobre/farmacologia , Diabetes Mellitus Tipo 2/enzimologia , Diabetes Mellitus Tipo 2/genética , Diabetes Mellitus Tipo 2/metabolismo , Feminino , Genótipo , Humanos , Técnicas In Vitro , Peroxidação de Lipídeos/efeitos dos fármacos , Lipoproteínas HDL/metabolismo , Lipoproteínas HDL/farmacologia , Masculino , Pessoa de Meia-Idade
18.
Atherosclerosis ; 138(2): 361-6, 1998 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-9690920

RESUMO

Paraoxonase (PON) is an HDL-bound enzyme capable of hydrolyzing lipid peroxides and believed to be in part responsible for the protective effect of HDL against LDL oxidation. Its activity is mainly determined by a gene polymorphism of the PON 1 gene (Glu-Arg 192). Low activity has been related to an elevated incidence of myocardial infarction. In several case-control studies, however, the high activity B allele is paradoxically more prevalent in patients. We have re-investigated this relationship, using carotid intima-media thickness (IMT) as a surrogate continuous variable for macroangiopathy. Genotypes were determined in 197 non insulin-dependent diabetic patients (HbAlc 8.8+/-0.15%, BMI 28.3+/-0.36). IMT, measured by high resolution mode B ultrasound, was the same for all genotypes (AA: 0.83+/-.013, AB 0.82+/-.017 and BB: 0.81+/-.034 mm). Bearers of the B allele displayed higher Lp(a) concentration (AA: 197+/-28, AB: 221+/-26, BB: 225+/-45 mg/l, P=0.024) with a significant linear trend (P < 0.005). Multiple regression showed age and systolic blood pressure, but not Lp(a), to be the main determinants of IMT variability without the contribution of the PON genotype. No consistent differences could be found between genotypes in the peroxidizability of LDL (lag-time, rate of diene production and maximal concentration). Our data support the view that there is no association between the early changes of atherosclerosis as defined by carotid IMT and variation in codon 192 of PON 1.


Assuntos
Artérias Carótidas/patologia , Diabetes Mellitus Tipo 2/genética , Esterases/genética , Polimorfismo Genético , Fatores Etários , Alelos , Arildialquilfosfatase , Pressão Sanguínea , Artérias Carótidas/fisiopatologia , Diabetes Mellitus Tipo 2/patologia , Diabetes Mellitus Tipo 2/fisiopatologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Análise de Regressão , Túnica Íntima/patologia , Túnica Média/patologia
19.
J Lipid Res ; 39(1): 59-65, 1998 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-9469586

RESUMO

The effects of CETP gene Taq1B polymorphism on plasma lipoproteins were investigated in 176 patients with non-insulin-dependent diabetes mellitus. The distribution of CETP genotypes was similar to that previously described in the general population. A significant association was found between CETP genotype and both CETP and HDL cholesterol (HDL-c) concentrations. B1B1 had the highest CETP and the lowest HDL-c whereas B2B2 had the lowest CETP and the highest HDL-c. However, HDL-c was not correlated with CETP concentration, even when genetic groups were separately considered. By multivariate analysis, the determinants of HDL were body mass index, triglycerides concentration, net mass CE transfer, and CETP genotype. No association was found between CETP genetic groups and HDL or LDL size distribution. In contrast, net mass CET was positively and HDL and LDL sizes were negatively correlated with plasma triglyceride concentration. Overall, our work demonstrates that, in a population of diabetic patients where lipoprotein-related parameters vary over a large range, the association of CETP gene polymorphism with HDL-c is independent of plasma CETP concentration.


Assuntos
Proteínas de Transporte/genética , HDL-Colesterol/sangue , Desoxirribonucleases de Sítio Específico do Tipo II/metabolismo , Diabetes Mellitus Tipo 2/genética , Glicoproteínas , Polimorfismo de Fragmento de Restrição , Adulto , Idoso , Proteínas de Transporte/sangue , Colesterol/sangue , Proteínas de Transferência de Ésteres de Colesterol , Feminino , Humanos , Lipoproteínas LDL/sangue , Masculino , Pessoa de Meia-Idade , Tamanho da Partícula , Triglicerídeos/sangue
20.
Diabetes Metab ; 23(2): 131-6, 1997 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-9137901

RESUMO

A 16 week, randomized, double-blind, parallel, placebo-controlled study was designed to determine the effects of low-dose pravastatin on cholesterol concentrations in patients with mild hypercholesterolemia and non-insulin-dependent diabetes mellitus (NIDDM). Following a 6-to 8-week dietary run-in period, a mean serum total cholesterol (TC) level > 5.2 mmol/L (200 mg/dL), but < 7.8 mmol/L (300 mg/dL) was required for entry. Metabolic control of diabetes was determined by a hemoglobin Alc (HbAlc) level less than twice the upper limit of normal on two occasions. Eighty six (86) patients recruited in 5 French diabetic clinics, were randomized in a ratio of 1:1 (pravastatin 10 mg or placebo), and 74 completed the study. There were 12 discontinuations: 5 (11.6%) in the pravastatin group and 7 (16.3%) in the placebo group. Drop-out was due to an adverse event in 1 patient (2.3%) in the pravastatin group and in 5 patients (11.6%) in the placebo group. Thirty five (35) placebo patients and 14 pravastatin patients had their dose of treatment doubled at week 8: the dose of treatment was to be doubled at week 8 in the event of non-response to treatment (TC at week 7 > 5.2 mmol/L and TC decrease < 15% from baseline). At week 16, pravastatin lowered TC from 6.4 to 5.6 mmol/L (-13.8%, p < 0.001 versus placebo), low-density lipoprotein cholesterol (LDL-C) from 4.3 to 3.4 mmol/L (-20.4%, p < 0.001 versus placebo) and slightly increased high-density lipoprotein cholesterol (HDL-C) from 1.18 to 1.25 mmol/L (+6.7%). Side effects were similar in both groups. Blood glucose control was not altered as assessed by serial HbAlc measurements which were unchanged during treatment. This study demonstrated that low-dose pravastatin is effective in lowering cholesterol levels in patients with hypercholesterolemia and NIDDM.


Assuntos
Anticolesterolemiantes/uso terapêutico , Colesterol/sangue , Diabetes Mellitus Tipo 2/complicações , Hiperlipidemias/tratamento farmacológico , Pravastatina/uso terapêutico , Adulto , Idoso , Análise de Variância , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Diabetes Mellitus Tipo 2/sangue , Método Duplo-Cego , Feminino , Hemoglobinas Glicadas/análise , Humanos , Hiperlipidemias/sangue , Hiperlipidemias/complicações , Masculino , Pessoa de Meia-Idade , Placebos , Pravastatina/efeitos adversos , Triglicerídeos/sangue
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