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A new technique to identify hybrid myotubes in vitro without culture fixation

C Labrecque, J Huard, G Dansereau, L Robitaille and JP Tremblay

Department of Anatomy, Laval University, Quebec, Canada.

Fluorescent latex microspheres (FLMs) were used to label myoblasts and to permit the observation of hybrid myotubes before culture fixation. This type of labeling did not affect survival, development, or fusion of these cells. The FLMs were retained for several weeks. Labeled mouse myoblasts were co-cultured with unlabeled rat myoblasts to verify whether the marker was released and spread from labeled to unlabeled cells. The nuclear stain Hoechst 33258 was used to distinguish the myoblasts from both species and permitted the demonstration that there was virtually no re-uptake. Hybrid myotubes were also obtained by co- culturing mouse myoblasts containing rhodamine FLMs and rat myoblasts containing green FLMs. These mixed cultures were observed repeatedly with a fluorescent microscope without any cytotoxic effect. Several myotubes were observed before fixation of the cultures to contain both types of fluorescent labels. Subsequent fixation and staining with Hoechst dye confirmed that these myotubes were hybrids.

Volume 39, Issue 1, pp. 139-143, 01/01/1991
Copyright © 1991 by The Histochemical Society


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