Background: The golden retriever muscular dystrophy (GRMD) dogs represent the best available animal model for therapeutic trials aiming at the future treatment of human Duchenne muscular dystrophy (DMD). We have obtained a rare litter of six GRMD dogs (3 males and 3 females) born from an affected male and a carrier female which were submitted to a therapeutic trial with adult human stem cells to investigate their capacity to engraft into dogs muscles by local as compared to systemic injection without any immunosuppression.

Nota: Estas diretrizes se prestam a informar e não a substituir o julgamento clínico do médico que, em última análise, deve determinar o tratamento apropriado para seus pacientes.

Pioneer work in male mouse embryonic stem (ES) cells differentiation into germ cells (GC) showed generations of male or female gametes in separate experiments, using genetically manipulated or preselected ES cells. In an attempt to produce both types of gametes from male mouse ES cells without any genetic manipulation or preselection, we induce the differentiation by retinoic acid (RA) within nonadherent embryoid bodies (EB). It seems that gamete-like cell formation occurs in the correct manner based on the expression of early and late GC-specific genes such as Oct-4, Mvh, Stella, Dazl, Piwil 2, Pdrd 1, Rex 14, Rnf 17, Bmp8b, Acrosin, Stra-8, Haprin, LH-R, Gdf9, Zp3, Zp2, Sycp1, and Sycp3. Immunofluorescence analysis of morphologically well-formed GC and presumptive gametes showed positive labeling for SSEA1, Oct-4, EMA-1, FE-J1, Dazl, Fragilis, Mvh, Acrosin, and acetylated alpha-tubulin. Conventional cytogenetic and FISH analysis indicated a chromosome reduction in ES-derived GC. Our data suggest that ES cells with XY chromosomes can produce under the same experimental conditions both types of presumptive gametes, and this production depends on their positional and temporal information within the EB context.

A liberal erythrocyte transfusion strategy with a hemoglobin trigger of 9 g/dl was associated with fewer major postoperative complications in patients having major cancer surgery compared with a restrictive strategy.