scholarly journals Role of the Sequence Surrounding Predicted Transmembrane Helix M4 in Membrane Association and Function of the Ca2+ Release Channel of Skeletal Muscle Sarcoplasmic Reticulum (Ryanodine Receptor Isoform 1)

2004 ◽  
Vol 279 (36) ◽  
pp. 37566-37574 ◽  
Author(s):  
Guo Guang Du ◽  
Guillermo Avila ◽  
Parveen Sharma ◽  
Vijay K. Khanna ◽  
Robert T. Dirksen ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Ryanodine Receptor ◽  
Transmembrane Helix ◽  
Membrane Association ◽  
Release Channel ◽  
And Function

Interaction of Bupivacaine and Tetracaine with the Sarcoplasmic Reticulum Ca2+Release Channel of Skeletal and Cardiac Muscles 

1999 ◽  
Vol 90 (3) ◽  
pp. 835-843 ◽  
Author(s):  
Hirochika Komai ◽  
Andrew J. Lokuta
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Cardiac Muscle ◽  
Ryanodine Receptor ◽  
Local Anesthetic ◽  
Local Anesthetics ◽  
Specific Effect ◽  
Receptor Activity ◽  
Maximal Inhibition ◽  
Release Channel

Background Although various local anesthetics can cause histologic damage to skeletal muscle when injected intramuscularly, bupivacaine appears to have an exceptionally high rate of myotoxicity. Research has suggested that an effect of bupivacaine on sarcoplasmic reticulum Ca2+ release is involved in its myotoxicity, but direct evidence is lacking. Furthermore, it is not known whether the toxicity depends on the unique chemical characteristics of bupivacaine and whether the toxicity is found only in skeletal muscle. Methods The authors studied the effects of bupivacaine and the similarly lipid-soluble local anesthetic, tetracaine, on the Ca2+ release channel-ryanodine receptor of sarcoplasmic reticulum in swine skeletal and cardiac muscle. [3H]Ryanodine binding was used to measure the activity of the Ca2+ release channel-ryanodine receptors in microsomes of both muscles. Results Bupivacaine enhanced (by two times at 5 mM) and inhibited (66% inhibition at 10 mM) [3H]ryanodine binding to skeletal muscle microsomes. In contrast, only inhibitory effects were observed with cardiac microsomes (about 3 mM for half-maximal inhibition). Tetracaine, which inhibits [3H]ryanodine binding to skeletal muscle microsomes, also inhibited [3H]ryanodine binding to cardiac muscle microsomes (half-maximal inhibition at 99 microM). Conclusions Bupivacaine's ability to enhance Ca2+ release channel-ryanodine receptor activity of skeletal muscle sarcoplasmic reticulum most likely contributes to the myotoxicity of this local anesthetic. Thus, the pronounced myotoxicity of bupivacaine may be the result of this specific effect on Ca2+ release channel-ryanodine receptor superimposed on a nonspecific action on lipid bilayers to increase the Ca2+ permeability of sarcoplasmic reticulum membranes, an effect shared by all local anesthetics. The specific action of tetracaine to inhibit Ca2+ release channel-ryanodine receptor activity may in part counterbalance the nonspecific action, resulting in moderate myotoxicity.

scholarly journals Thimerosal Interacts with the Ca2+ Release Channel Ryanodine Receptor from Skeletal Muscle Sarcoplasmic Reticulum

1995 ◽  
Vol 270 (50) ◽  
pp. 29644-29647 ◽  
Author(s):  
Jonathan J. Abramson ◽  
Anthony C. Zable ◽  
Terence G. Favero ◽  
Guy Salama
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Ryanodine Receptor ◽  
Release Channel

scholarly journals Nicotinic acid–adenine dinucleotide phosphate activates the skeletal muscle ryanodine receptor

2002 ◽  
Vol 367 (2) ◽  
pp. 423-431 ◽  
Author(s):  
Martin HOHENEGGER ◽  
Josef SUKO ◽  
Regina GSCHEIDLINGER ◽  
Helmut DROBNY ◽  
Andreas ZIDAR
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Nicotinic Acid ◽  
Ryanodine Receptor ◽  
Spatial Information ◽  
Single Channel ◽  
Reversal Potential ◽  
Open Probability ◽  
Release Channel

Calcium is a universal second messenger. The temporal and spatial information that is encoded in Ca2+-transients drives processes as diverse as neurotransmitter secretion, axonal outgrowth, immune responses and muscle contraction. Ca2+-release from intracellular Ca2+ stores can be triggered by diffusible second messengers like InsP3, cyclic ADP-ribose or nicotinic acid—adenine dinucleotide phosphate (NAADP). A target has not yet been identified for the latter messenger. In the present study we show that nanomolar concentrations of NAADP trigger Ca2+-release from skeletal muscle sarcoplasmic reticulum. This was due to a direct action on the Ca2+-release channel/ryanodine receptor type-1, since in single channel recordings, NAADP increased the open probability of the purified channel protein. The effects of NAADP on Ca2+-release and open probability of the ryanodine receptor occurred over a similar concentration range (EC5030nM) and were specific because (i) they were blocked by Ruthenium Red and ryanodine, (ii) the precursor of NAADP, NADP, was ineffective at equimolar concentrations, (iii) NAADP did not affect the conductance and reversal potential of the ryanodine receptor. Finally, we also detected an ADP-ribosyl cyclase activity in the sarcoplasmic reticulum fraction of skeletal muscle. This enzyme was not only capable of synthesizing cyclic GDP-ribose but also NAADP, with an activity of 0.25nmol/mg/min. Thus, we conclude that NAADP is generated in the vicinity of type 1 ryanodine receptor and leads to activation of this ion channel.

Evidence for a role of C-terminus in Ca2+ inactivation of skeletal muscle Ca2+ release channel (ryanodine receptor)

FEBS Letters ◽  
1999 ◽  
Vol 459 (2) ◽  
pp. 154-158 ◽  
Author(s):  
Junichi Nakai ◽  
Ling Gao ◽  
Le Xu ◽  
Chunlin Xin ◽  
Daniel A. Pasek ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Ryanodine Receptor ◽  
Release Channel ◽  
C Terminus
Sign in / Sign up

Export Citation Format

Share Document