These inhibiting forces require for their maintenance a relatively high level of sensory input of appropriate quality and frequency.
Principally, this effect could contribute to the negative inotropic effect of CCh, but similar to IK,CCh, the inhibition of ICa required higher CCh concentrations than were needed to inhibit force production or reduce AP duration in the intact sinoatrial preparations.
Our results suggest that nAg, but not Ag+ alone, inhibits force production by the myocardium, that Ag in any form disrupts normal pacing of cardiac contractions, and that these responses are likely not due to cytotoxicity.
Inhibition of either MYPT-1 phosphorylation or [Ca2+]i-mediated MLCK activation, or both will thus inhibit force generation.
Among the four phosphorylation sites on cTnT, Thr-203 appeared to be the most important for modulation of cTn function in that it inhibited force as well as its Ca2+ sensitivity [ 33].
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These results suggest that oMAP4 prevents microtubule sliding by crosslinking microtubules rather than by inhibiting dynein force generation per se.
Additional mechanisms to reduce IFP should also be explored including targeting other ECM components (such as collagen, versican, or decorin) or inhibiting contractile forces generated by fibroblasts.
CCh concentrations (3·10-8 M - 7·10-8 M) that significantly inhibit atrial force have practically no effect on HR.
At the concentration of 3·10-8 M CCh, which inhibits atrial force about 50% but has no effect on sinoatrial pacemaking rate, AP duration was reduced ~50% (48 ± 10 and 50 ± 6% for CA and WA fish, respectively).
