The objective of this study was to determine whether the voltage-sensitive release mechanism (VSRM) can be stimulated independently from Ca(2+)-induced Ca(2+) release (CICR) by drugs that elevate intracellular cAMP. Contractions were measured in voltage-clamped guinea pig ventricular myocytes at 37 degrees C. Na(+) current was blocked. We compared effects of agents that elevate cAMP through act...

The mandibular motor pattern induced by the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) in isolated locust suboesophageal ganglia (SOG) was investigated and compared with the motor pattern induced by pilocarpine in an already established preparation of the SOG. Motor patterns occurring after bath application of IBMX or pilocarpine were recorded extracellularly from suitable n...

Pharmacological analysis of in vivo cAMP phosphodiesterase in Xenopus oocytes using the nonselective enzyme inhibitors 3-isobutyl-1-methylxanthine (IBMX), theophylline, and papaverine, demonstrated inhibition of insulin- and insulin-like growth factor-1-induced maturation at concentrations that were 17-60-fold lower than those required to inhibit progesterone-induced germinal vesicle breakdown....

The effect of verapamil on insulin secretion in the presence of IBMX was studied in B cells in pancreatic monolayer cultures of the neonatal rat using a perifusion system. For the initial three days, B cells were exposed to a medium of either 5.5 or 11.1 mM glucose and 10 microM iodoacetic acid (IAA) after which they were exposed to a medium of either 5.5 or 11.1mM glucose until day 7. Insulin ...

A possible role for cyclic adenosine 3',5'-monophosphate (cAMP) in islet B cell replication was examined in neonatal rat pancreatic monolayer cultures. Islet cells deteriorated and insulin release decreased during 12 d of culture in medium with 5.6 mM glucose, whereas the cells survived and insulin release increased during culture in medium with 5.6 mM glucose plus the phosphodiesterase inhibit...

L-Histidine and imidazole (the histidine side chain) significantly increase cAMP accumulation in intact LLC-PK1 cells. This effect is completely inhibited by isobutylmethylxanthine (IBMX). Histidine and imidazole stimulate cAMP phosphodiesterase activity in soluble and membrane fractions of LLC-PK1 cells suggesting that the IBMX-sensitive effect of these agents to stimulate cAMP formation is no...

We evaluated the effect of glucagon on cardiac automaticity as well as the possible role of cyclic nucleotide phosphodiesterases (PDE) in regulating this effect. Concentration response curves for glucagon in the absence and in the presence of the non-selective PDE inhibitor IBMX were performed in the isolated right ventricle of the rat. We found that glucagon produces only a minor increase of v...

1. Cantharidin, an inhibitor of protein phosphatase types 1 (PP1) and 2A (PP2A), increased basal tone of bovine isolated coronary artery rings (CARs) with and without endothelium in a time- and concentration-dependent manner with pEC50 values of about 5.1 and 5.2, respectively, for both preparations. 2. Beta-Adrenoceptor stimulation with isoprenaline (Iso; 0.03-100 microM) or inhibition of phos...

The phosphodiesterase inhibitor 3-isobutyl-1-methylxan thine (IBMX), which enhances 12-O-tetradecanoylphorbol-13acetate (TPA)-stimulated cyclic nucleotide levels and ornithine decarboxylase (L-ornithine carboxy-lyase, EC 4.1.1.17) activity in mouse epidermis in vivo, was tested for its ability to modify the process of skin carcinogenesis using the initiation-promo tion (two-step) model system f...

In the butterfly Inachis io, a pupal melanization reducing factor (PMRF) which is located throughout the entire central nervous system controls the intensity of pigmentation of pupal cuticle depending on the background color of the pupation site. PMRF does not only reduce melanization but, in addition, enhances lutein incorporation in a dose-dependent manner to form pupae with yellow color on b...