title: CaM kinase II and phospholamban contribute to caffeine-induced relaxation of murine gastric fundus smooth muscle.
abstract: Caffeine has been shown to increase the Ca(2+) release frequency (Ca(2+) sparks) from the sarcoplasmic reticulum (SR) through ryanodine-sensitive stores and relax gastric fundus smooth muscle. Increased Ca(2+) store refilling increases the frequency of Ca(2+) release events and store refilling is enhanced by CaM kinase II (CaMKII) phosphorylation of phospholamban (PLB). These findings suggest that transient, localized Ca(2+) release events from the SR may activate CaMKII and contribute to relaxation by enhancing store refilling due to PLB Thr17 phosphorylation. To investigate this possibility, we examined the effects of caffeine on CaMKII, muscle tone, and PLB phosphorylation in murine gastric fundus smooth muscle. Caffeine (1 mM) hyperpolarized and relaxed murine gastric fundus smooth muscle and activated CaMKII. Ryanodine, tetracaine, or cyclopiazonic acid each prevented CaMKII activation and significantly inhibited caffeine-induced relaxation. The large-conductance Ca(2+)-activated K(+) channel blocker iberiotoxin, but not apamin, partially inhibited caffeine-induced relaxation. Caffeine-induced CaMKII activation increased PLB Thr17, but not PLB Ser16 phosphorylation. 3-Isobutyl-1-methylxanthine increased PLB Ser16 phosphorylation, but not PLB Thr17 phosphorylation. The CaMKII inhibitor KN-93 inhibited caffeine-induced relaxation and PLB Thr17 phosphorylation. These results show that caffeine-induced CaMKII activation and PLB phosphorylation play a role in the relaxation of gastric fundus smooth muscles.
authors.affiliation: Department of Physiology and Cell Biology, Center of Biomedical Research Excellence, University of Nevada School of Medicine, Anderson Bldg./MS352, Reno, NV 89557, USA.
authors.forename: Minkyung
authors.initials: M
authors.lastname: Kim
authors.forename: Sang Yun
authors.initials: SY
authors.lastname: Cho
authors.forename: In Soo
authors.initials: IS
authors.lastname: Han
authors.forename: Sang Don
authors.initials: SD
authors.lastname: Koh
authors.forename: Brian A
authors.initials: BA
authors.lastname: Perrino
mesh_terms: D000818:Animals; D002110:Caffeine / Q000494:pharmacology*; D002118:Calcium / Q000502:physiology; D002135:Calcium-Binding Proteins / Q000502:physiology*; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000502:physiology*; D004789:Enzyme Activation; D051379:Mice; D008815:Mice, Inbred Strains; D009126:Muscle Relaxation / Q000187:drug effects / Q000502:physiology*; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology*; D013270:Stomach / Q000187:drug effects / Q000502:physiology*; D000099211:Phospholamban
chemical_list: D002110:Caffeine; D002118:Calcium; D002135:Calcium-Binding Proteins; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D000099211:Phospholamban