To assess subclinical cardiac function impairment in Duchenne dystrophy (DMD) female carriers. Forty-four female subjects proved as DMD carriers underwent echocardiographic examination including tissue Doppler imaging (TDI) of mitral and tricuspid annulus. Seventeen age-matched healthy female subjects served as controls. A significant differences in peak systolic annular velocity (Sa) between carriers and controls were found for lateral and septal part of the mitral annulus and for tricuspid annulus (0.09 vs. 0.11 m/s, p < 0.001, 0.08 vs. 0.09 m/s, p < 0.01 and 0.13 vs. 0.14 m/s, p = 0.02 respectively). There was also difference in early diastolic velocity (Ea) of the septal part of the mitral annulus (0.11 vs. 0.13 m/s, p = 0.03). The subclinical deterioration of systolic function is presented even in asymptomatic DMD female carriers.

• MeSH
• dopplerovská echokardiografie MeSH
• dospělí MeSH
• Duchennova muskulární dystrofie diagnostické zobrazování   genetika   patofyziologie   MeSH
• dysfunkce levé srdeční komory diagnostické zobrazování   patofyziologie   MeSH
• heterozygot * MeSH
• lidé středního věku MeSH
• lidé MeSH
• mitrální chlopeň diagnostické zobrazování   MeSH
• rychlost toku krve MeSH
• studie případů a kontrol MeSH
• systola MeSH
• trikuspidální chlopeň diagnostické zobrazování   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Recent data on Duchenne muscular dystrophy (DMD) show myocyte progenitor's involvement in the disease pathology often leading to the DMD patient's death. The molecular mechanism underlying stem cell impairment in DMD has not been described. We created dystrophin-deficient human pluripotent stem cell (hPSC) lines by reprogramming cells from two DMD patients, and also by introducing dystrophin mutation into human embryonic stem cells via CRISPR/Cas9. While dystrophin is expressed in healthy hPSC, its deficiency in DMD hPSC lines induces the release of reactive oxygen species (ROS) through dysregulated activity of all three isoforms of nitric oxide synthase (further abrev. as, NOS). NOS-induced ROS release leads to DNA damage and genomic instability in DMD hPSC. We were able to reduce both the ROS release as well as DNA damage to the level of wild-type hPSC by inhibiting NOS activity.

• Klíčová slova
• DMD, NO synthases, ROS, dystrophin, genome stability, pluripotent stem cells,
• MeSH
• buněčné linie MeSH
• Duchennova muskulární dystrofie genetika   MeSH
• dystrofin nedostatek   genetika   MeSH
• indukované pluripotentní kmenové buňky metabolismus   patologie   MeSH
• lidé MeSH
• nestabilita genomu * MeSH
• oxidační stres MeSH
• reaktivní formy kyslíku metabolismus   MeSH
• synthasa oxidu dusnatého, typ I metabolismus   MeSH
• synthasa oxidu dusnatého, typ II metabolismus   MeSH
• synthasa oxidu dusnatého, typ III metabolismus   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• dystrofin MeSH
• NOS1 protein, human MeSH Prohlížeč
• NOS2 protein, human MeSH Prohlížeč
• NOS3 protein, human MeSH Prohlížeč
• reaktivní formy kyslíku MeSH
• synthasa oxidu dusnatého, typ I MeSH
• synthasa oxidu dusnatého, typ II MeSH
• synthasa oxidu dusnatého, typ III MeSH

BACKGROUND: The progressive cardiomyopathy that develops in boys with Duchenne and Becker muscular dystrophy (DMD/BMD) is presumed to be a secondary consequence of the fibrosis within the myocardium. There are only limited data on using parametric imaging in these patients. The purpose of this study was to assess native T1 and extracellular volume (ECV) values in DMD patients. METHODS: The Czech population of males with DMD/BMD was screened. All eligible patients fulfilling the inclusion criteria were included. Forty nine males underwent cardiac magnetic resonance (MR) examination including T1 native and post-contrast mapping measurements. One DMD patient and all BMD patients were excluded from statistical analysis. Three groups were compared - Group D1 - DMD patients without late gadolinium enhancement (LGE) (n = 23), Group D2 - DMD patients with LGE (n = 20), and Group C - gender matched controls (n = 13). RESULTS: Compared to controls, both DMD groups had prolonged T1 native relaxation time. These results are concordant in all 6 segments as well as in global values (1041 ± 31 ms and 1043 ± 37 ms vs. 983 ± 15 ms, both p < 0.05). Group D2 had significantly increased global ECV (0.28 ± 0.044 vs. 0.243 ± 0.013, p < 0.05) and segmental ECV in inferolateral and anterolateral segments in comparison with controls. The results were also significant after adjustment for subjects' age. CONCLUSION: DMD males had increased native T1 relaxation time independent of the presence or absence of myocardial fibrosis. Cardiac MR may provide clinically useful information even without contrast media administration.

• Klíčová slova
• Cardiac magnetic resonance, Cardiomyopathy, Duchene muscular dystrophy, T1 mapping; extracellular volume,
• MeSH
• Duchennova muskulární dystrofie diagnostické zobrazování   MeSH
• gadolinium analýza   MeSH
• kardiomyopatie diagnostické zobrazování   MeSH
• lidé MeSH
• magnetická rezonanční tomografie metody   MeSH
• mladiství MeSH
• Check Tag
• lidé MeSH
• mladiství MeSH
• mužské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Česká republika MeSH
• Názvy látek
• gadolinium MeSH