Abstract
The contraction and relaxation of skeletal muscle is driven by release of Ca2+ from sarcoplasmic reticulum through the ryanodine receptor type 1 and extruding the ion from the cytosol by Ca2+ATPases. Efficient refilling of the empty Ca2+ stores is essential for repetitive cycles of muscle contraction and relaxation, but not investigated in human skeletal muscle cells. Here we show that under conditions of selective depletion of the ryanodine-sensitive Ca2+ pool Ca2+ influx occurs in differentiated human skeletal muscle cells using the Ca2+ imaging technique. This Ca2+ influx is not due to permeation through the L-type Ca2+ channel and not observed under conditions of inhibited Ca2+ ATPase. The Ca2+ influx was visualised by quenching the intracellular fura2 signal with Mn2+ on single cell level and also using fluorescence photometry of cell suspensions. The Mn2+ influx was inhibited by the Ca2+ channel blockers La3+ and SKF96356. The delineation of the signalling cascade leading to Ca2+ influx evoked by selective depletion of ryanodine sensitive Ca2+ stores showed that phospholipase C or protein kinase C were not involved. Interestingly, a Mn2+ influx was triggered by the cell-permeant analogue of diacylglycerol and further augmented by the application of RHC80267, a diacylglycerol lipase inhibitor. This signalling pathway could be attributed to the participation of a protein kinase C activity. However, Mn2+ influx evoked by selective depletion of ryanodine sensitive Ca2+ stores was not altered by RHC80267 or protein kinase C inhibitors. Using RT-PCR, correctly spliced mRNA fragments were detected corresponding to human transient receptor potential (TRPC) Ca2+ channels type 1, 3, 4 and 6. These data show that in skeletal muscle at least two independent mechanisms of Ca2+ influx exist. For Ca2+ influx triggered by the selective depletion of ryanodine sensitive Ca2+ stores we propose a phospholipase C independent coupling of ryanodine receptors to voltage insensitive Ca2+ channels.
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Acknowledgements
We are grateful to M. Freissmuth (Vienna) and H. Kubista (Vienna) for helpful discussion and critical reading of the manuscript and S. Boehm and E. Moskvina for providing us with hippocampal cDNA. This work was supported by research grants of the "Fonds zur Förderung der wissenschaftlichen Forschung" (P-14940 to M.H.), the OeNB Jubiläumsfond (No. 6646 to M.H.; and No. 8266 L.W.), the Hochschuljubiläumsstiftung der Stadt Wien (H-27/2000 to M.H.) and the Anton Dreher-Gedächtnisstiftung (to MH).
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Weigl, L., Zidar, A., Gscheidlinger, R. et al. Store operated Ca2+ influx by selective depletion of ryanodine sensitive Ca2+ pools in primary human skeletal muscle cells. Naunyn-Schmiedeberg's Arch Pharmacol 367, 353–363 (2003). https://doi.org/10.1007/s00210-003-0705-8
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DOI: https://doi.org/10.1007/s00210-003-0705-8