A comparative study of magnetic-activated cell sorting, cytotoxicity and preplating for the purification of human myoblasts.

Although cultured myoblast transplantation has been extensively studied as a gene complementation approach to muscular dystrophy treatment, clinical success has still been limited. The inability to adequately isolate and purify myoblasts presents a major limitation to the production of sufficient myoblasts for engrafting purposes. This study attempted to purify myoblasts from primary culture by magnetic-activated cell sorting (MACS), complement-mediated cytotoxicity, and a preplating technique. As a result of positive myoblasts selection by MACS, the average percentage of myoblasts in mixed culture was increased from 30.0% to 41.7%. We observed both myoblast lysis and fibroblast lysis after complement-mediated cytotoxicity. Enrichment of myoblasts in mixed culture was found to increase to 83.1% by using the preplating technique. In addition, higher purification (92.8%) was achieved by following the preplating technique with MACS. Thus, preplating in combination with magnetic-activated cell sorting allows for a rapid and effective isolation of myoblasts from human muscle tissue.