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. 1991 Oct;442:711–741. doi: 10.1113/jphysiol.1991.sp018816

Electrophysiological and immunohistochemical analysis of muscle differentiation in a mouse mesodermal stem cell line.

Y Kubo 1
PMCID: PMC1179912  PMID: 1665864

Abstract

1. A mesodermal stem cell line C3H10T1/2 was induced to differentiate to muscle by adding 0.3 microM-5-aza-2'-deoxy-cytidine to the medium for 24 h. The changes in membrane currents during differentiation were studied by whole-cell recording and changes in the expression of fibronectin, Neural Cell Adhesion Molecule (NCAM), myosin and desmin were studied immunohistochemically. 2. The stem cells showed the morphology of fibroblastic cells. Most of the stem cells showed ATP-induced slow K+ current. T-type Ca2+ current and inward rectifier K+ current were observed in 19% of the stem cells. The stem cells expressed fibronectin, but not NCAM, myosin or desmin. 3. About 2 weeks after the addition of 5-aza-2'-deoxy-cytidine, large multinucleated skeletal muscle-like cells appeared. Most of the induced muscles showed L-type Ca2+ current, responses to acetylcholine, outward K+ current, inward rectifier K+ current and contraction upon depolarizing stimulation. They expressed NCAM, myosin and desmin, but not fibronectin, and showed no ATP response. 4. In some batches (2/14), the induced muscles showed spontaneous twitches, and possessed tetrodotoxin (TTX)-sensitive Na+ current in addition to the currents described above. Furthermore clear striation was observed in some of the twitching muscles under Nomarski optics. 5. To ascertain the properties of cells at the initial step of muscle differentiation, whose differentiation is determined but not yet evident morphologically or electrophysiologically, subcloning was performed from the heterogeneous cells 10 days after induction. Three myogenic clones were obtained, which proliferated at low cell densities but differentiated to muscle with a high incidence at high cell densities, as well as ten non-myogenic clones. 6. Most myogenic clones still showed ATP-induced K+ current and fibronectin. In addition, most of them showed T-type Ca2+ current and inward rectifier K+ current. They had already expressed NCAM. No other properties observed in muscles had yet been expressed. Most cells of the non-myogenic clones showed ATP-induced K+ current and fibronectin. T-type Ca2+ current was also expressed, but not inward rectifier K+ current or NCAM. 7. The properties of the observed ionic currents were studied. The TTX-sensitive Na+ current could be completely blocked by 0.1 microM-TTX. It could be evoked by depolarizing steps to a level above -40 mV, while steady-state inactivation was detectable around -75 mV and reached half by -52 mV. T-type Ca2+ current could be evoked by a depolarizing pulse to a level above -45 mV, with a maximum amplitude around -15 mV.(ABSTRACT TRUNCATED AT 400 WORDS)

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