title: Purified lectin from skeletal muscle inhibits myotube formation in vitro.
abstract: A lactose-extractable lectin obtained from 14--16-d embryonic chick pectoral muscle and myotube muscle cultures by affinity chromatography inhibited myotube formation in culture. When applied to muscle cultures at 0.09 micrograms/ml, the purified lectin produced variable effects on the inhibition of myotube formation related to the time and length of application, suggesting that components of the culture medium and/or temperature produced inactivation. Hemagglutination assays showed that the lectin was inactivated by horse serum and by chick embryo extract but not by L-15 salt solution at 4 degrees C. Incubation in L-15 solution at 37 degrees C with or without 2 mM dithiothreitol resulted in inactivation in 2--3 h. To maximize the effect of the lectin on the inhibition of myotube formation, primary muscle cultures were grown in low [Ca+2] medium to inhibit fusion, and then [Ca+2] was increased to elicit fusion in the absence and presence of lectin with solution renewal every 2 h. Without lectin, myotube formation was normal, whereas, with lectin, it was inhibited by 93%. Continued incubation at 37 degrees C. without renewal of lectin resulted in myotube formation, suggesting reversibility by lectin inactivation.
mesh_terms: D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002459:Cell Fusion / Q000187:drug effects*; D002478:Cells, Cultured; D002846:Chromatography, Affinity; D037102:Lectins / Q000302:isolation & purification / Q000494:pharmacology*; D009132:Muscles / Q000166:cytology*
chemical_list: D037102:Lectins