RESUMEN
This report describes a Phase I clinical trial of a novel selective stem cell placement (SSCP) protocol using autologous bone marrow mononuclear stem cells (BM-MNSCs) to treat patients with multiple sclerosis (MS) with post-operative functional changes measured by gait performance. Previous studies have demonstrated that clinically significant gait deviations occur at all stages of MS that involve walking. Consequently, to determine the functional benefit of SSCP, the timed 25-foot walk (T25FW) was administered to 31 MS patients before and after treatment. The time and number of steps taken to complete the test significantly decreased post-intervention. This suggests that recovery of function in MS patients is possible and that SSCP using BM-MNSCs should be considered for future clinical trials as a possible treatment for MS. Study limitations and directions for future research are also discussed.
RESUMEN
Strategies to construct the physical map of the Trypanosoma cruzi nuclear genome have to capitalize on three main advantage of the parasite genome, namely (a) its small size, (b) the fact that all chromosomes can be defined, and many of them can be isolated by pulse field gel electrophoresis, and (c) the fact that simple Southern blots of electrophoretic karyotypes can be used to map sequence tagged sites and expressed sequence tags to chromosomal bands. A major drawback to cope with is the complexity of T. cruzi genetics, that hinders the construction of a comprehensive genetic map. As a first step towards physical mapping, we report the construction and partial characterization of a T. cruzi CL-Brener genomic library in yeast artificial chromosomes (YACs) that consists of 2.770 individual YACs with a mean insert size of 365 kb encompassing around 10 genomic equivalents. Two libraries in bacterial artificial chromosomes (BACs) have been constructed, BACI and BACII. Both libraries represent about three genome equivalents. A third BAC library (BAC III) is being constructed. YACs and BACs are invaluable tools for physical mapping. More generally, they have to be considered as a common resource for research in Chagas disease.