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. 1988 Jul;401:617–637. doi: 10.1113/jphysiol.1988.sp017183

Post-natal disappearance of transient calcium channels in mouse skeletal muscle: effects of denervation and culture.

T Gonoi 1, S Hasegawa 1
PMCID: PMC1191870  PMID: 2845066

Abstract

1. The whole-cell voltage clamp technique was used to record Ba2+ currents in voltage-sensitive Ca2+ channels in mouse flexor digitorum brevis muscles developing in situ from day 1 to 30 after birth. Effects of denervation and tissue culture on the Ca2+ channel currents were also studied. 2. The muscle fibres in newborn mice showed two distinct types of Ca2+ channel currents, a low-threshold transient current and a high-threshold sustained current. 3. The specific amplitude of the transient current was 2.7 +/- 1.7 (S.D.) A/F in response to -30 mV test pulses in medium containing 30 mM-Ba2+ on day 1 after birth. The transient current decreased progressively in the post-natal days and became undetectable by day 17. In contrast, the specific amplitude of the sustained current in response to +20 mV test pulses increased 4-fold from 6.9 A/F on day 1 to 27.7 A/F on day 30. 4. The disappearance of the transient current could not be accounted for by either shifts in voltage dependence of activation and inactivation or changes in activation and inactivation times of the two types of current during development. 5. Denervating muscle fibres on day 8 after birth did not prevent the disappearance of the transient current. Denervating them on day 17 did not allow reappearance of the transient current. However, the increase of the sustained current was suppressed by the denervation either on day 8 or day 17. 6. In muscle fibres isolated on day 8 after birth and cultured thereafter, the transient current did not disappear until day 19 in culture (27 days after birth), while the sustained current was maintained at the level on day 8. 7. In muscle fibres isolated on day 17, when the transient current had become undetectable, and cultured thereafter, the transient current did not reappear until day 15 in culture (32 days after birth), while the sustained current was maintained at a level similar to that on day 17. 8. We conclude that innervation has little influence on the developmental disappearance of the transient Ca2+ channel current in mouse muscle fibres, and suggest that some influencing factors from surroundings other than the nerve may be required for the disappearance of the functional transient channels.

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Selected References

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