Fig 4. Detection of altered activity of the SERCA pump due to the decreased SERCA1b expression.
Representative records showing the difference in maximal transport rate of the Ca2+ pump (PVmax) from the declining phase of the Ca2+-transient following the KCl-induced depolarization (A) in scrambled and (B) in SERCA1b-specific shRNA transfected C2C12 myotubes (cloneC1). (C) Mean values of [Ca2+]i before and after the transients, demonstrating that following the transients [Ca2+]i declined slower and returned to a significantly higher level in cloneC1 compared to scrambled shRNA transfected cells. (D) Pooled data of SERCA pump activity in selected cloneC1, C5, and scrambled shRNA transfected cells. Numbers in parentheses indicate the number of cells measured. Asterisks (*) and Hashmarks (#) mark significant (P<0.01) differences between cells bathed in standard Tyrode’s solution.