Abstract：
:1. Pharmacological inhibitors of protein kinase A (PKA) and protein phosphatases 1/2A were used to determine whether basal L-type Ca(2+) current (I(Ca)) observed in the absence of exogenous beta-adrenergic receptor stimulation is sustained by PKA-mediated phosphorylation. Amphotericin B was used to record whole-cell I(Ca) in the perforated patch-clamp configuration. 2. Calyculin A and isoprenaline (both 1 micromol l(-1)) increased basal I(Ca) (P<0.05), whereas H-89 inhibited I(Ca) in a concentration-dependent manner with an IC(50) approximately 5 micromol l(-1). H-89 also inhibited the response to 1.0 micromol l(-1) isoprenaline, although relatively high concentrations (30 micromol l(-1)) were required to achieve complete suppression of the response. 3. Double-pulse protocols were used to study the effects of 10 micromol l(-1) H-89 on time-dependent recovery of I(Ca) from voltage-dependent inactivation as well as the steady-state gating of I(Ca). T(0.5) (time for I(Ca) to recover to 50% of the preinactivation amplitude) increased in the presence of H-89 (P<0.05) but was unaffected by calyculin A or isoprenaline. 4. Steady-state activation/inactivation properties of I(Ca) were unaffected by 10 micromol l(-1) H-89 or 1 micromol l(-1) calyculin A, whereas isoprenaline caused a leftward shift in both curves so that V(0.5) for activation and inactivation became more negative. 5. Data show that basal I(Ca) is regulated by cAMP-PKA-mediated phosphorylation in the absence of externally applied beta-receptor agonists and that relatively high concentrations of H-89 are required to fully suppress the response to beta-adrenergic receptor stimulation, thereby limiting the value of H-89 as a useful tool in dissecting signalling pathways in intact myocytes.
journal_name
Br J Pharmacoljournal_title
British journal of pharmacologyauthors
Bracken N,Elkadri M,Hart G,Hussain Mdoi
10.1038/sj.bjp.0706809subject
Has Abstractpub_date
2006-08-01 00:00:00pages
1108-15issue
8eissn
0007-1188issn
1476-5381pii
0706809journal_volume
148pub_type
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doi：10.1111/j.1476-5381.1984.tb16442.x
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更新日期：2015-03-01 00:00:00
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