Differentiation of membrane systems during development of slow and fast skeletal muscle fibres in chicken

1993 ◽  
Vol 14 (6) ◽  
pp. 633-645 ◽  
Author(s):  
Hiroaki Takekura ◽  
Henry Shuman ◽  
Clara Franzini-Armstrong
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibres ◽  
Membrane Systems ◽  
Fast Skeletal Muscle ◽  
Skeletal Muscle Fibres

Excitation—contraction coupling in skeletal and caudal heart muscle of the hagfishEptatretus burgeriGirard

2002 ◽  
Vol 205 (22) ◽  
pp. 3535-3541
Author(s):  
Isao Inoue ◽  
Izuo Tsutsui ◽  
Quentin Bone
Keyword(s):  
Skeletal Muscle ◽  
Heart Muscle ◽  
Force Generation ◽  
Muscle Fibres ◽  
Fast Skeletal Muscle ◽  
K Concentration ◽  
Electrical Stimuli ◽  
Skeletal Muscle Fibres ◽  
Coupling Mechanisms ◽  
External K

SUMMARYHagfishes are regarded as the most primitive living craniates. Excitation—contraction (E—C) coupling mechanisms were studied in skeletal and caudal heart muscle fibres of the hagfish Eptatretus burgeri. In white (fast) skeletal muscle fibres from the musculus tubulatus, force generation in response to electrical stimulation was maintained in nominally Ca2+ free artificial seawater (ASW)(0Ca2+-ASW) containing 10 mmol l-1 Co2+ (a blocker of Ca2+ currents). Similarly, in red (slow) fibres from parietal muscle bathed in 0Ca2+-ASW containing 10 mmol l-1 Co2+, force generation occurred in association with K+ depolarisation when the external K+ concentration was increased to 100 mmol l-1. Therefore, external Ca2+ is not required for muscle contraction. Hence, both white and red fibres possess the function of depolarisation-induced Ca2+-release from intracellular Ca2+ stores. This function is the same as in the skeletal muscle of all other vertebrates. In caudal heart muscle fibres,twitches in response to electrical stimuli were maintained in 0Ca2+-ASW containing 30 mmol l-1 Co2+. In fibres loaded with fluo-3 bathed in 0Ca2+-ASW containing 30 mmol l-1 Co2+, an increase in the intracellular free Ca2+ level associated with K+ depolarisation was observed after the external K+ concentration was increased to 100 mmol l-1. Thus E—C coupling in the caudal heart muscle is also of the vertebrate skeletal muscle type.

scholarly journals Swimming-induced exercise promotes hypertrophy and vascularization of fast skeletal muscle fibres and activation of myogenic and angiogenic transcriptional programs in adult zebrafish

BMC Genomics ◽  
2014 ◽  
Vol 15 (1) ◽  
pp. 1136 ◽  
Author(s):  
Arjan P Palstra ◽  
Mireia Rovira ◽  
David Rizo-Roca ◽  
Joan Torrella ◽  
Herman P Spaink ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Fibres ◽  
Adult Zebrafish ◽  
Fast Skeletal Muscle ◽  
Skeletal Muscle Fibres
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