The aim of this study was to select an effective and stable protocol for the differentiation of human satellite cells (Sc) and to identify the optimal time period for the experimental use of differentiated human Sc-cultures. In order to identify the differentiation conditions which give a good survival of myotubes and a high grade of differentiation, Sc-cultures were induced to differentiate in media supplemented with either 2% fetal calf serum (FCS) 2% horse serum (HS) or 10% HS. Based on higher CK-activities in cultures differentiating in FCS-supplemented media compared to horse sera, fetal calf serum was chosen to induce differentiation. The ATP, DNA and protein content increased during the first 4 days after induction of differentiation and was followed by a period with minor changes. The maximal differences of ATP, DNA and protein between days 4-10 were evaluated and the differences in the three components were found to be less than 20% of the average value with a certainity of more than 0.9. Day 8-myotubes were investigated morphologically and were found immunoreactive for fast myosin, and expressed areas with clear cross striation. We recommend the use of differentiated Sc-cultures in the period from day 4 to 8 after induction of differentiation as only minor differentation-related changes will take place in the cells during this period of time.

Both the pumps used in this study are safe alternatives for rapid transfusion of RBCs; however, with MRP this can be accomplished approximately twice as fast as with the PIP.

This is the first study investigating prolonged aPTT in the post-transplantation period. All patients with prolonged aPTT had acquired transient antibodies, i.e. LA or 'LA-like'. If a renal biopsy was requested, 70.4% of the transplanted patients would presumably have their biopsy postponed due to prolonged aPTT, but as LAs do not increase the risk of bleeding, such a delay would be unnecessary. Immediate LA investigation is therefore recommended if a recently transplanted patient requiring surgical procedures has a prolonged aPTT.