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1.
Prog Urol ; 27(8-9): 467-473, 2017.
Artigo em Francês | MEDLINE | ID: mdl-28576421

RESUMO

PURPOSE: Research of predictive factors of biochemical recurrence to guide the establishment of an adjuvant treatment after radical prostatectomy for cancer with positive surgical margins. METHODOLOGY: A retrospective cohort of 1577 afro-caribbean patients undergoing radical prostatectomy operated between 1st January 2000 and 1st July 2013 was analyzed. In this cohort, 406 patients had positive surgical margin, we excluded 11 patients who received adjuvant therapy (radiotherapy, hormonotherapy, radio-hormonotherapy) and 2 patients for whom histological analysis of the surgical specimen was for a pT4 pathological stage. After a descriptive analysis, we used a Cox model to look for predictors of survival without biochemical recurrence then, depending on the significant variables, we separated our population into six groups: stage pT2 with Gleason score≤3+4 (group 1), stage pT2 with a score of Gleason≥4+3 (group 2), stage pT3a with a Gleason core≤3+4 (group 3), pT3a stage with a score of Gleason≥4+3 (group 4), stage pT3b with a Gleason score≤3+4 (group 5) and stage pT3b Gleason≥with a score of 4+3 (group 6) and compared survival without biochemical recurrence using a log rank test. After radical prostatectomy with surgical margins with an anatomopathological stage≤pT3b, a Gleason score≥4+3 had a pejorative survival without biochemical recurrence than pathological stage (P<0.001). RESULTS: In multivariate analysis, predictors of survival without biochemical recurrence after radical prostatectomy with positive surgical margins were the majority Gleason postoperative (P<0.0001), pathological stage (P=0.049) adjusted preoperative PSA (P=0.826), with the body mass index (BMI) (P=0.59) and tumor volume (P=0.95). CONCLUSION: A high postoperatively Gleason score (≥4+3) has a better predictive value of biochemical recurrence than pathological stage pT2 or pT3 at the patients having been treated for prostate cancer by radical prostatectomy with positive surgical margins. LEVEL OF EVIDENCE: 4.


Assuntos
Adenocarcinoma/etnologia , População Negra/estatística & dados numéricos , Recidiva Local de Neoplasia/etnologia , Prostatectomia/estatística & dados numéricos , Neoplasias da Próstata/etnologia , Adenocarcinoma/sangue , Adenocarcinoma/patologia , Adenocarcinoma/cirurgia , Idoso , Biomarcadores Tumorais/sangue , Região do Caribe/epidemiologia , França/epidemiologia , Humanos , Masculino , Margens de Excisão , Pessoa de Meia-Idade , Gradação de Tumores , Invasividade Neoplásica , Recidiva Local de Neoplasia/patologia , Recidiva Local de Neoplasia/cirurgia , Valor Preditivo dos Testes , Antígeno Prostático Específico/sangue , Neoplasias da Próstata/sangue , Neoplasias da Próstata/patologia , Neoplasias da Próstata/cirurgia , Estudos Retrospectivos , Sensibilidade e Especificidade , Resultado do Tratamento
2.
Prog Urol ; 24(6): 327-33, 2014 May.
Artigo em Francês | MEDLINE | ID: mdl-24821554

RESUMO

OBJECTIVES: Study the interest of addition of PSA density (PSAD), to the selection criteria of the French protocol for inclusion patients Afro-Caribbean on active surveillance prostate cancer. METHODS: A retrospective analysis of 1505 patients who had, in turn, a radical prostatectomy for cancer between 2000 and 2012, in a single reference center. One hundred and forty-one patients was eligible, at the time of their diagnosis, for active surveillance by the criteria of the French protocol. This population was divided into 2 groups according to the histological analysis of the prostatectomy specimen confirmed indolent cancer or overturned. The median PSAD of each group was calculated to be compared. Secondarily, the most discriminating PSAD was investigated by the method of ROC after constitution tables intrinsic validity in this population. This threshold has secondary conducting a comparative analysis of the underestimation of cancer in terms of aggressiveness and/or extension between patients selected according to the criteria of the French protocol and "on-selected" patients according to these criteria and their PSAD. RESULTS: Of the 141 patients identified for analysis, histological examination of the prostatectomy specimen has to show that 42 patients (29.7 %) were actually more aggressive cancer (20.6 % of Gleason ≥ 7), wider (4.2 % ≥ pT3) or larger and more aggressive (4.9 %) than foreshadowed criteria French protocol. The median PSAD these 42 patients were significantly higher than the median PSAD patients correctly estimated (0.18 vs. 0.14, p-value=0.046). The application of the most discriminating threshold: 0.15 ng/ml/cm(3) in this population allowed to significantly improve the selection of candidates of the 79 "on-selected" patients, six (20.2 %) were actually more aggressive cancer (13.9 % of Gleason ≥ 7), wider (2.5 % ≥ pT3) or larger and more aggressive (3.8 %). CONCLUSION: The criteria for the French protocol for active surveillance, applied to the Caribbean population underestimate 29 % of non-latent cancers. Adjuvants criteria that must be inexpensive, sensitive and specific seem necessary in this population. A PSAD<0.15 ng/ml/cm(3) could be one of these criteria.


Assuntos
Biomarcadores Tumorais/sangue , Vigilância da População , Antígeno Prostático Específico/sangue , Neoplasias da Próstata/sangue , Neoplasias da Próstata/diagnóstico , Idoso , Região do Caribe/etnologia , Protocolos Clínicos , Seguimentos , França , Humanos , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Invasividade Neoplásica , Vigilância da População/métodos , Valor Preditivo dos Testes , Prostatectomia/métodos , Neoplasias da Próstata/patologia , Neoplasias da Próstata/cirurgia , Estudos Retrospectivos , Fatores de Risco , Sensibilidade e Especificidade
4.
Prog Urol ; 22(15): 954-62, 2012 Nov.
Artigo em Francês | MEDLINE | ID: mdl-23102018

RESUMO

OBJECTIVE: To analyze in a Caribbean population at 90% of African descent, the results of radiotherapy with androgen deprivation (AD) in high-risk prostate cancer (PCa). PATIENTS AND METHODS: Fifty-nine consecutive patients with a high-risk PCa as defined by the D'AMICO classification and treated by radiotherapy with AD between January 2003 and April 2009 in our center were analyzed. The median dose of radiation and the median duration of AD were 70Gy and 37months respectively. Biochemical recurrence (BF), as primary outcome was defined according to the PHOENIX criteria (nadir PSA+2ng/mL). Multivariate analysis was performed to identify predictive factors of BF. The median follow-up was 47months. RESULTS: Eight (13.6%) patients had BF and four (6.8%) developed metastases. Six (10.2%) died during the follow-up. The 5years acturial biochemical disease-free survival was 79.7%. Multivariate analyses have shown that Gleason sum (GS) superior to 7 (P=0.029), AD duration less than 24months (P=0.004) and the rate of Nadir PSA greater or equal to 0.5ng/mL (P=0.011) were independent predictive factors of BF. CONCLUSION: This study was the first to our knowledge, to provide that radiotherapy associate with AD for HRPC among Caribbean men is effective as observed in other populations. Patients with GS superior to 7 could be considered for more aggressive treatments in clinical trials.


Assuntos
Antagonistas de Androgênios/uso terapêutico , Neoplasias da Próstata/tratamento farmacológico , Neoplasias da Próstata/radioterapia , Idoso , Idoso de 80 Anos ou mais , Região do Caribe , Terapia Combinada , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
8.
West Indian Med J ; 54(2): 135-8, 2005 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-15999885

RESUMO

OBJECTIVE: Although transrectal ultrasound-guided prostatic biopsies are associated with significant discomfort and pain, most urologists do not use any kind of anaesthesia. We therefore compared the efficacy of two local anaesthetics, namely, the rectal administration of lidocaine gel and lidocaine periprostatic infiltration prior to biopsies. DESIGN AND METHODS: Three hundred and fifty-six randomized patients received either 15 mL of 2% lidocaine gel administered intrarectally ten minutes before prostate biopsies in group 1 (180 patients) or 10 mL of 1% lidocaine given under ultrasound guidance in two periprostatic injections of 5 mL, four minutes before the biopsies in group 2 (176 patients). A visual analogue scale (VAS) was used to assess the pain score during anaesthesia (VAS 1), during the biopsies (VAS 2) and 30 minutes after them (VAS 3). RESULTS: Patients receiving lidocaine gel experienced statistically less pain than the lidocaine injection group for mean VAS 1 (0.1 vs 1.4, p < 0.0001) and mean VAS 3 (0.8 vs 1.4, p < 0. 001) but VAS 2 showed no statistically significant difference (2.0 vs 2.1). No major morbidity was noted with either anaesthetic. CONCLUSION: Rectal administration of lidocaine gel is both safe, simple and effective and results are more satisfactory than with lidocaine periprostatic infiltration.


Assuntos
Anestesia Local/métodos , Anestésicos Locais/administração & dosagem , Biópsia , Tomada de Decisões , Lidocaína/administração & dosagem , Próstata/patologia , Administração Retal , Idoso , Endossonografia , Guadalupe/epidemiologia , Humanos , Incidência , Injeções , Masculino , Dor/diagnóstico , Dor/epidemiologia , Medição da Dor , Satisfação do Paciente , Próstata/diagnóstico por imagem , Doenças Prostáticas/diagnóstico , Reto
9.
Int J STD AIDS ; 6(4): 273-7, 1995.
Artigo em Inglês | MEDLINE | ID: mdl-7548291

RESUMO

This study reports the prevalence of sexually transmitted diseases (STDs) among gynaecological outpatients presenting at the Bobo-Dioulasso Hospital (Burkina Faso) with genital infections and examines the factors associated with HIV infection in this population. Of 245 eligible non-pregnant women, 220 consented to participate in the study. Seventy-seven per cent had sexually transmitted infections. The most common were: Trichomonas vaginalis (28%), Chlamydia trachomatis (27%), bacterial vaginosis (20%), Candida albicans (17%), Neisseria gonorrhoeae (11%). The prevalence of HIV infection was 42% (95% c.i. 35.3, 48.3). Logistic regression analyses revealed Neisseria gonorrhoeae to be the only STD significantly associated with infection with HIV (P = 0.04). A sedimentation rate greater than or equal to 100 mm in the first hour was also associated with HIV infection (P < 0.001). Women consulting for genital infections constitute a high risk group for HIV infection and other STDs. Management of these women should focus on the early diagnosis and treatment of STDs.


PIP: During May-October 1992 in the gynecology and obstetrics department at the National Central Hospital Souro Sanou in Bobo-Dioulasso, Burkina Faso, physicians conducted a physical examination of and took vaginal smears from 220 nonpregnant women of reproductive age who consented to take part in this study and who had clinical signs of a genital infection. The researchers wanted to determine the prevalence of sexually transmitted diseases (STDs) and the factors associated with HIV infection. 77% had an STD. The most common STDs were Trichomonas vaginalis (28%) and Chlamydia trachomatis (27%). 42% were HIV positive. HIV-positive women were significantly more likely than HIV-negative women to be infected with Neisseria gonorrhoeae (30.4% vs. 24.2%; p = 0.03). Risk factors associated with HIV infection among women presenting with genital infections included young age (25.5 vs. 27.5 years; p = 0.03), low gravidity (2 vs. 2.7; p = 0.04), a higher sedimentation rate in the first hour (75.3 vs. 54; p 0.001), and a low hemoglobin level (11.7 vs. 12.2 g/dl; p = 0.01). These findings indicate that women with genital infections are a group at high risk of HIV and other STDs and a target population for preventive interventions. Physicians should focus on detection and treatment of STDs when they manage cases with genital infections, and they should give appropriate advice on the prevention of HIV to all women presenting with genital infections.


Assuntos
Doenças dos Genitais Femininos/complicações , Infecções por HIV/complicações , Infecções Sexualmente Transmissíveis/complicações , Adulto , Sedimentação Sanguínea , Burkina Faso , Estudos de Casos e Controles , Estudos Transversais , Feminino , Doenças dos Genitais Femininos/sangue , Infecções por HIV/sangue , Soronegatividade para HIV , Humanos , Modelos Logísticos , Prevalência , Fatores de Risco , Infecções Sexualmente Transmissíveis/sangue
10.
Ann Cardiol Angeiol (Paris) ; 37(8): 413-7, 1988 Oct.
Artigo em Francês | MEDLINE | ID: mdl-3056211

RESUMO

Over a period of two years (1986-1987), the authors have studied the morbidity and mortality of various cardiovascular diseases in a hospital population of 268 patients. By comparing it with a previous similar study conducted over 5 years (1981-1985), they have reached the following conclusions: the prevalence of the main nosological groups is equivalent (H.B.P., rheumatoid valvulopathies, chronic pulmonary heart, ischemic cardiopathies; severity of the valvulopathies and their prognosis which raise social and medical problems especially that of cardiac surgery, still inexistent in Guinea; increased prevalence of diseases such as hypertension and rheumatoid valvulopathies. They suggest early screening, especially for rheumatoid valvulopathies and hypertension, which cause major social problems because of their complications. Besides, it would be desirable that visits at regular intervals be made mandatory in schools and universities and at preemployment examinations and in all SMI (?) centers in the country.


Assuntos
Doenças Cardiovasculares/epidemiologia , Adolescente , Adulto , África Ocidental , Idoso , Idoso de 80 Anos ou mais , Doenças Cardiovasculares/mortalidade , Feminino , Hospitais Universitários , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Tempo
11.
Ann Cardiol Angeiol (Paris) ; 37(8): 425-8, 1988 Oct.
Artigo em Francês | MEDLINE | ID: mdl-3190143

RESUMO

In 5 years, 41 cases of chronic pulmonary heart were observed at the University Hospital Ignace-Deen in Conakry, representing 7.14 p. cent of hospitalized patients, thus ranking 4th after Hypertension, various myocardiopathies, and valvulopathies. These patients are from a rural background in 65.21 p. cent of the cases. Chronic bronchitis, 4 p. cent of the cases, and bronchial asthma, 27 p. cent of the cases, represent the main causes. An important factor is that all patients were hospitalized with heart failure, at different stages of NYAH.


Assuntos
Doença Cardiopulmonar/epidemiologia , Adulto , África Ocidental , Idoso , Feminino , Hospitais Universitários , Humanos , Masculino , Pessoa de Meia-Idade , Doença Cardiopulmonar/complicações , Doença Cardiopulmonar/etiologia
12.
Ann Cardiol Angeiol (Paris) ; 37(8): 429-33, 1988 Oct.
Artigo em Francês | MEDLINE | ID: mdl-3190144

RESUMO

The cardiovascular pathology is dominated in Guinea, as in most third-world countries, by valve cardiopathies. These valve diseases are particularly severe and affect children and teen-agers, representing a real public health problem. The severity of these cardiopathies is also obvious because of the severe haemodynamic repercussions and the palliative nature of the medical treatment, since most of these patients are in need of a valve replacement procedure, which currently is only available to some of them. Thus, everything must be done to prevent and treat these diseases. The present study, carried out in a hospital environment, concerns 182 cases of valve cardiopathies hospitalized in the Cardiology Department of the University Hospital Ignace-Deen between January 1, 1981 and December 31, 1987.


Assuntos
Valva Aórtica , Valva Mitral , Adolescente , Adulto , África Ocidental , Idoso , Idoso de 80 Anos ou mais , Feminino , Doenças das Valvas Cardíacas/epidemiologia , Doenças das Valvas Cardíacas/etiologia , Hospitalização , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de Tempo
13.
Ann Cardiol Angeiol (Paris) ; 37(8): 435-7, 1988 Oct.
Artigo em Francês | MEDLINE | ID: mdl-3190145

RESUMO

The authors study 11 cases of myocardial infarction, hospitalized in the Cardiology Department of the University Hospital Ignace Deen in Conakry, between 1981 and 1987 inclusively, in a total of 842 patients. The series includes 9 men and 2 women, with ages varying from 40 to 63 years, mean 52.4 years. From this study, it results that the frequency of myocardial infarction reaches 1.28 p. cent. From the epidemiological standpoint, the patients belong to relatively well-to-do socio-economic strata. The coronary disease in these areas is original in that it is infrequent. However, the risks factors are the same as elsewhere: hypercholesterolemia: 8 in 11 cases, obesity: 7 in 11 cases; and tobacco abuse: 5 in 11 cases.


Assuntos
Infarto do Miocárdio/epidemiologia , Adulto , África Ocidental , Angiografia Coronária , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de Risco
14.
Ann Cardiol Angeiol (Paris) ; 37(8): 419-24, 1988 Oct.
Artigo em Francês | MEDLINE | ID: mdl-3190142

RESUMO

The authors analyze 574 cases of heart failure observed in the Cardiology Department of the University Hospital Ignace-Deen in Conakry, in a period of 5 years (1981-1985), from the etiological and nosological standpoints. The result is that cardiac insufficiency is very frequent in the department and the patients, in most cases, are found in stage IV of the NYHA (64.98%). There are more men (59.75%) than women (40.25%). Age varies from 15 to 80 years (mean: 49.2 years). Hypertension (37.47%), senile cardiopathies (20.20%), various myocardiopathies (17.24%), rheumatoid valvulopathies (13.95%) are the most frequently encountered etiologies. Pericarditis is rare (0.34%).


Assuntos
Insuficiência Cardíaca/etiologia , Adolescente , Adulto , África Ocidental , Idoso , Idoso de 80 Anos ou mais , Feminino , Insuficiência Cardíaca/classificação , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Tempo
15.
Int J Tuberc Lung Dis ; 17(5): 590-6, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23575322

RESUMO

OBJECTIVE: To evaluate the cost-effectiveness of novel first-line treatment regimens for tuberculosis (TB). DESIGN: Using decision analysis, we projected the costs and effectiveness, from the health care perspective, of treating a patient cohort in the public sector for active TB without known or suspected resistance to first-line drugs. We compared standard (6-month) treatment to hypothetical regimens of equal efficacy, higher cost and shorter duration. RESULTS: For every 100 TB patients treated, replacing standard treatment with shorter-course regimens would avert an estimated 2-4 failures/relapses, 0.2-0.4 deaths and 8-14 disability-adjusted life years (DALYs), or 6-11% of all DALYs suffered. We identified three primary determinants of cost-effectiveness: drug price, continuation phase treatment delivery costs and deaths averted through fewer relapses. In a high treatment cost scenario (similar to Brazil), averted delivery costs outweighed higher drug costs, making novel regimens cost-saving. In a low treatment cost scenario (similar to the Philippines), a 4-month regimen with a drug price of $1/day cost $66 per patient, or $840 per DALY averted, and became cost-saving if the drug price dropped below $0.37/day. CONCLUSION: Although they avert a small proportion of total DALYs, novel, shorter-course first-line regimens for TB are likely to be cost-effective or cost-saving in most settings.


Assuntos
Antituberculosos/administração & dosagem , Antituberculosos/economia , Custos de Medicamentos , Tuberculose/tratamento farmacológico , Tuberculose/economia , Redução de Custos , Análise Custo-Benefício , Técnicas de Apoio para a Decisão , Avaliação da Deficiência , Esquema de Medicação , Quimioterapia Combinada , Humanos , Modelos Econômicos , Setor Público/economia , Recidiva , Fatores de Tempo , Resultado do Tratamento , Tuberculose/diagnóstico , Tuberculose/mortalidade
16.
Health sci. dis ; 19(2): 61-64, 2018. ilus
Artigo em Francês | AIM | ID: biblio-1262797

RESUMO

Introduction. La survenue d'un corps étranger (CE) est un motif fréquent de consultation en ORL. Le but de notre étude était d'analyser les données épidémiologiques, cliniques et thérapeutiques des sujets porteurs de corps étrangers à l'Hôpital National Ignace Deen (CHU de Conakry). Matériels et méthodes. Il s'agit d'une étude prospective de type descriptif, étalée de Janvier ­à décembre 2015 (un an), portant sur tous les cas de corps étrangers des conduits auditifs externes et des voies aérodigestives supérieures colligés au service d'ORL de l'Hôpital National Ignace Deen. Nos variables d'intérêt étaient les données épidémiologiques, cliniques et thérapeutiques Résultats. Durant la période d'étude, 192 cas de CE ont été colligés parmi les 2177 consultations, soit une fréquence de 8,82%. L'âge des patients variait de 2 à 60 ans avec une prédominance des enfants de moins de 10 ans (42,71%). Le sex-ratio homme/femme était de deux. Le délai moyen d'admission était de 48h avec des extrêmes de 0 à 30 jours. Les circonstances de survenue des CE étaient représentées par les jeux dans 54,17 % des cas. Le conduit auditif externe était la localisation la plus fréquente (64,58%). La nature des CE était inorganique dans 76,56 % des cas et organique dans 23,44 % des cas. Tous les CE ont été extraits par la voie d'introduction, le plus souvent au fauteuil de consultation (90,10 % des cas). L'évolution a été favorable chez tous les patients. Conclusion. Les corps étrangers ORL constituent un motif fréquent de consultation et affectent surtout les enfants de sexe masculin.ils sont habituellement inorganiques et affectent surtout le conduit auditif externe. L'évolution est en règle favorable après extraction


Assuntos
Meato Acústico Externo , Corpos Estranhos/diagnóstico , Corpos Estranhos/epidemiologia , Corpos Estranhos/terapia , Guiné , Otolaringologia
17.
Health sci. dis ; 19(1)2018.
Artigo em Francês | AIM | ID: biblio-1262782

RESUMO

Introduction et objectifs. L'association du diabète aux pathologies oto-rhino-laryngologiques est un fait classique. Cette association constitue par la difficulté thérapeutique et la gravité de ses complications, un problème clinique et thérapeutique. Notre étude avait pour but de décrire la prise en charge des pathologies ORL chez les diabétiques à l'Hôpital National Donka. Méthodologie. Il s'agit d'une étude transversale descriptive effectuée au mois de mai 2015. Elle a concerné tous les patients diabétiques vus en ambulatoires ou hospitalisés aux services ORL-CCF et d'Endocrinologie-Diabétologie de l'Hôpital National Donka, présentant un signe ORL et ayant accepté de participer à l'étude. Résultat. La prévalence des pathologies ORL chez les diabétiques était de 33%. Les sujets âgés d'au moins 56 ans étaient les plus représentés (75%) avec un écart type de 15 et des extrêmes de 2 et 90 ans. Les patients sans revenu étaient les plus atteints (58,6%). 78,9% des patients vivaient en zone urbaine. La quasi- totalité des patients ont été examiné en ambulatoire (92,9 %). Le diabète de type II a dominé la série (94,6%). L'hypertension artérielle représentait 51,6% des pathologies associées. L'hyperglycémie à jeun a été retrouvée chez 84,6% des patients (P=0,01). La rhino sinusite était la pathologie la plus fréquente (72,3%). Les antibiotiques, l'antalgique, la corticothérapie ont été les plus utilisés. Conclusion. Chez le sujet diabétique avec affection ORL, le diabète est le plus souvent mal contrôlé. La rhinosinusite est la pathologie la plus fréquente


Assuntos
África Subsaariana , Diabetes Mellitus , Otorrinolaringopatias/complicações
19.
Bull Cancer ; 96(2): 165-70, 2009 Feb.
Artigo em Francês | MEDLINE | ID: mdl-19258223

RESUMO

In mainland France, as in most Western countries, prostate cancer is the most frequent cancer in men. However, the incidence of this cancer is highly variable, depending on the region of the world. This variability is largely accounted for by differences in access to care, but also by environmental conditions and the ethnogeographic origins of the populations. The French West Indies--the archipelago of Guadeloupe and the island of Martinique--are unique in terms of their geography, environment and the lifestyle and origins of their populations. We report the incidence and mortality rates for prostate cancer in the French West Indies and also provide the first description of the major clinical and anatomical characteristics of this disease in this region.


Assuntos
Neoplasias da Próstata/epidemiologia , Neoplasias da Próstata/patologia , Distribuição por Idade , Idoso , Idoso de 80 Anos ou mais , França/epidemiologia , Saúde Global , Guadalupe/epidemiologia , Humanos , Incidência , Masculino , Martinica/epidemiologia , Pessoa de Meia-Idade , Neoplasias da Próstata/mortalidade
20.
Mol Cell Biochem ; 213(1-2): 51-9, 2000 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-11129958

RESUMO

Rat HDL are known to increase testosterone production by cultured Leydig cells either following gonadotropin stimulation or cholesteryl ester depletion. However, rat HDL contain apolipoprotein E and have a high affinity for the members of the low density receptor family such as LDL receptor, LDL receptor related protein and VLDL receptor. In contrast with the adrenal cells, the contribution of apo A-I and apo E pathways in HDL cholesterol uptake has not been yet evidenced in rat Leydig cells. Recent data provided evidence that hCG stimulates scavenger receptor BI expression in testes. In order to investigate if testosterone production can be stimulated by apo E depleted HDL, we compared the level of testosterone stimulation by HDL with or without apo E first, in presence of saturating dose of hCG (1 IU/ml) and second, after depletion of cholesterol synthesis by pravastatin, an inhibitor of HMG-CoA reductase. In presence of hCG, HDL with or without apo E increased testosterone production respectively by 37 and 25%. Pravastatin at 100 microg/ml inhibited the cholesterol synthesis and the testosterone production by 25% and decreased the cholesteryl content by 25%. The addition of HDL with or without apo E (50 microg protein HDL/ ml) completely overcame the depletion of cellular cholesteryl esters and the inhibition of testosterone production induced by pravastatin. In the presence of heparin, apo E depleted HDL overcame the testosterone production induced by pravastatin, indicating that uptake of HDL without apo E via a secretion of apo E by the cells themselves was not involved. Therefore, in absence of apo E, it is suggested that rat Leydig cells used HDL to regulate steroidogenesis via an apolipoprotein A-I pathway.


Assuntos
Apolipoproteínas E/fisiologia , Células Intersticiais do Testículo/metabolismo , Lipoproteínas HDL/fisiologia , Testosterona/biossíntese , Animais , Apolipoproteínas E/química , Células Cultivadas , Colesterol/metabolismo , Gonadotropina Coriônica/farmacologia , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Lipoproteínas HDL/química , Lipoproteínas HDL/farmacologia , Masculino , Pravastatina/farmacologia , Ratos , Ratos Sprague-Dawley
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