Title : β₁-adrenoceptor stimulation promotes LPS-induced cardiomyocyte apoptosis through activating PKA and enhancing CaMKII and IκBα phosphorylation.

Pub. Date : 2015 Mar 9

PMID : 25887954






6 Functional Relationships(s)
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1 RESULTS: LPS induced apoptosis in adult mouse ventricular myocytes, dobutamine (DOB), a beta1-AR agonist, promoted apoptosis, caspase-8, 9 and 3 activation and increased cytosolic Ca(2+) concentration in LPS-challenged cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus
2 RESULTS: LPS induced apoptosis in adult mouse ventricular myocytes, dobutamine (DOB), a beta1-AR agonist, promoted apoptosis, caspase-8, 9 and 3 activation and increased cytosolic Ca(2+) concentration in LPS-challenged cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus
3 DOB also up-regulated TNF-alpha expression, decreased Bcl-2 levels, promoted Bax translocation to mitochondria, mitochondrial membrane potential loss and cytochrome c release as well as IkappaBalpha, p38 MAPK, JNK and Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) phosphorylation in LPS-treated cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus
4 Pretreatment with nifedipine not only significantly blocked the enhancing effects of DOB on LPS-induced elevation in cytosolic Ca(2+) concentration and CaMKII phosphorylation in cardiomyocytes, but also partly reversed the effects of DOB on caspase-9 and caspase-3/7 activities in LPS-treated cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus
5 Pretreatment with nifedipine not only significantly blocked the enhancing effects of DOB on LPS-induced elevation in cytosolic Ca(2+) concentration and CaMKII phosphorylation in cardiomyocytes, but also partly reversed the effects of DOB on caspase-9 and caspase-3/7 activities in LPS-treated cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus
6 Pretreatment with nifedipine not only significantly blocked the enhancing effects of DOB on LPS-induced elevation in cytosolic Ca(2+) concentration and CaMKII phosphorylation in cardiomyocytes, but also partly reversed the effects of DOB on caspase-9 and caspase-3/7 activities in LPS-treated cardiomyocytes. Dobutamine toll-like receptor 4 Mus musculus