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  • 1
    ISSN: 1590-3478
    Schlagwort(e): Gonadotropins ; Testosterone ; Dihydrotestosterone ; Androstenedione ; Hypogonadism ; Male ; Myotonic dystrophy ; Impotence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Sommario Allo scopo di studiare in maniera completa l'ipogonadismo ipergonadotropo maschile nella distrofia miotonica e di valutarne le eventuali conseguenze sull'atrofia muscolare e sulla sessualità, sono stati determinati con metodo RIA o IRMA in 29 pazienti affetti da distrofia miotonica e in 34 soggetti sani: LH, FSH, prolattina, testosterone totale (T) e libero (FT), estradiolo (E), diidrotestosterone (DHT), SHBG, androstenedione (A), 17-OH-Progesterone. Le medie ± deviazione standard di questi ormoni sono risultati: LH=8.0±4.4 mIU/ml, FSH=17.4±11.5 mIU/ml, A=2.0±1.3 ng/ml, tutti più elevati dei controlli. T=406±290 ng/dl; FT=22.7±7.0 pg/ml, DHT 55.5±29.7 ng/dl tutti più bassi dei controlli. Il riscontro di bassi valori di FT e DHT, non studiati prima d'ora in questi soggetti, conferma e rende più evidente il deficit androgenico. L'elevato livello di A con T basso dimostra un deficit dell'enzima 17-deidrogenasi. La durata della malattia correla significativamente sia con il tasso di T (r−0.56) che di FT (r−0.59) e quindi l'ipogonadismo tende ad aggravarsi progressivamente. Dividendo i nostri pazienti in tre gruppi (A, B, C) in base alla gravità del danno muscolare i livelli di LH e FSH erano più elevati (rispettivamente 9.3±4.7 and 20.6±12.3 mIU/ml vs 4.8±0.9 and 8.4±3.8, p〈0.03) e T più basso (rispettivamente 337.3±263.4 ng/dl vs 649.7±320.3, p〈0.03) nelle forme più gravi (gruppo A). Tuttavia tra i tre gruppi non sono state riscontrate variazioni del FT e quindi è poco probabile una influenza dell'ipogonadismo sulla atrofia muscolare. Circa il 25% dei pazienti lamentava impotenza sessuale. Questi soggetti avevano livelli di FSH e LH più elevati (p〈0.001) e di testosterone libero più bassi (p〈0.03) rispetto a chi aveva normale sessualità. Tuttavia l'ipogonadismo potrebbe non essere la sola causa dell'impotenza. Gli impotenti appartenevano tutti al gruppo C ed avevano una espansione della tripletta CTG molto alta. È possibile che anche l'ipogonadismo e il deficit sessuale siano legati ad alterazioni di tessuto muscolare: le cellule miodi peritubulari del testicolo e la muscolatura liscia dei corpi cavernosi.
    Notizen: Abstract In order to study male hypergonadotropic hypogonadism as completely as possible, and to evaluate its possible effects on muscle atrophy and sexuality, RIA or IRMA methods were used to measure the levels of luteinizing hormone (LH), follicle stimulating hormone (FSH), prolactin, total (T) and free (FT) testosterone, estradiol (E), dihydrotestosterone (DHT), sex hormone binding globulin (SHBG), androstenedione (A) and 17-OH-progesterone (17-OH-P) in 29 patients with myotonic dystrophy (MD). The mean hormonal levels ±SD were: LH 8.0±4.4 mIU/ml, FSH 17.4±11.5 mIU/ml, A 200±130 ng/dl (all higher than in controls); T 406±290 ng/dl, FT 22.7±7.0 pg/ml, DHT 55.5±29.7 ng/ml (all lower than in controls). The low FT and DHT levels (never previously studied in MD) confirm the androgenic deficiency. The high androstenedione levels and low testosterone concentrations suggest defective enzyme 17-dehydrogenase. The duration of the disease correlated with both testosterone (r=−0.56) and FT levels (r=−0.59), showing that hypogonadism tends to worsen progressively. When the patients were divided into three groups on the basis of the severity of muscle involvement (A, B and C), LH and FSH levels were higher in group C (more severe disease) than in group A, respectively 9.3±4.7 and 20.6±12.3 mIU/ml versus 4.8±0.9 and 8.4±3.8, p〈0.03; T levels were lower in group C than in group A, 337.3±263.4 ng/dl versus 649.7±320.3 (p〈0.03); however, there was no significant difference in the FT levels of the three groups, which may imply that hypogonadism is unlikely to have a direct effect on muscle atrophy. About 25% of our patients were impotent; these subjects had higher LH and FSH (p〈0.001) and lower FT levels than the patients who were not impotent (p〈0.03). However, hypogonadism may not be the only cause of impotence as all of the impotent patients belonged to group C and had a very high (CTG)n triplet expansion. We hypothesise that hypogonadism and sexual impairment could be partially due to a muscle cell alteration: i.e. a dysfunction of both the testicular peritubular myoid cells and of the corpus cavernosum smooth muscle.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 0263-6484
    Schlagwort(e): Troponin T ; myotonic dystrophy ; polymerase chain reaction ; cDNA sequencing ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Recent studies have shown that the gene encoding for the slow skeletal troponin isoform T (TNNT1) is located on the proximal long arm of human chromosome 19 in the myotonic dystrophy (DM) region. In order to test TNNT1 as a candidate gene for DM, we have isolated TNNT1 cDNA from skeletal muscle from two healthy individuals and from two patients with DM. Sequencing of the TNNT1 cDNA from the DM and normal muscle revealed two sequence variants but no transcriptionally significant mutations. This work rules out a defect in the coding segment of TNNT1 as a cause of DM and provides a polymerase chain reaction protocol for studying troponin T gene expression.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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