Ca++ activation of ATPase activity, ATP-P1 exchange, and tension in briefly glycerinated heart muscle

1977 ◽  
Vol 72 (2-3) ◽  
pp. 133-139 ◽  
Author(s):  
H. J. Reiermann ◽  
J. W. Herzig ◽  
J. C. Rüegg
Keyword(s):  
Atpase Activity ◽  
Heart Muscle

Direct interaction between troponin and myosin enhances the ATPase activity of heavy meromyosin

Biologia ◽  
2017 ◽  
Vol 72 (6) ◽  
Author(s):  
Nazanin Bohlooli Ghashghaee ◽  
King-Lun Li ◽  
Wen-Ji Dong
Keyword(s):  
Atpase Activity ◽  
Heart Muscle ◽  
Direct Interaction ◽  
Heavy Meromyosin ◽  
Thin Filaments ◽  
Cross Bridge ◽  
The Cross ◽  
Contractility Of The Heart

AbstractContractility of the heart muscle is a result of sliding movements between thick and thin filaments, produced by interactions between actin and myosin during the cross-bridge cycle. Activation of the myofilament is triggered by Ca

scholarly journals An Electron Microscopic Study on Adenosinetriphosphatase (ATPase) Activity in the Heart Muscle

1970 ◽  
Vol 34 (1) ◽  
pp. 13-19 ◽  
Author(s):  
SEITOKU MIZUNO ◽  
SHIGERU TAKAMATSU ◽  
YUICHI TAMADA ◽  
KOHEI ARAYA ◽  
AKIHIKO TAKAHASHI ◽  
...  
Keyword(s):  
Atpase Activity ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Heart Muscle ◽  
Electron Microscopic

A biochemical mechanism by which adrenergic mediators modify cardiac contraction

1965 ◽  
Vol 209 (1) ◽  
pp. 8-16 ◽  
Author(s):  
Allan C. Stam ◽  
Carl R. Honig
Keyword(s):  
Atpase Activity ◽  
Heart Muscle ◽  
Adrenergic Receptor ◽  
Cardiac Contraction ◽  
Adrenergic Blockade ◽  
Biochemical Mechanism ◽  
Actomyosin Atpase ◽  
Site Of Action ◽  
Presence And Absence

The influence of adrenergic mediators on the Mg-stimulated actomyosin ATPase of glycerinated cardiac myofibrils was analyzed. The mediators increased ATPase activity in the presence of soluble cardiac relaxing substance, but were without effect in its absence. Mechanical changes in the fibrils accompanied changes in ATPase activity. Threshold concentrations were: dl-isoproterenol = 3 x 10–8 m, l-epinephrine = 7 x 10–8 m, and l-norepinephrine = 6 x 10–7 m. Dichloroisoproterenol and dichloroepinephrine decreased ATPase activity in both the presence and absence of relaxing substance. The depressant effects of the dichloro analogs were not altered by epinephrine and isoproterenol, and could account for adrenergic "blockade" in vivo. Evidence of the specificity of myofibrillar enzyme, relaxing substance, and adrenergic stimulus is presented. Comparison of the properties of the cardiac inotropic adrenergic receptor with the properties of the soluble cardiac relaxing system suggests that the latter constitutes an intracellular site of action of adrenergic mediators in heart muscle.

scholarly journals Changes in Ca-ATPase Activity and Ca Uptake Rate of Heart Muscle SR of the Stroke-Prone SHR in Relation to Aging

1979 ◽  
Vol 20 (5) ◽  
pp. 699-699
Author(s):  
Hideaki Higashino ◽  
Takao Yanagawa ◽  
Aritomo Suzuki
Keyword(s):  
Atpase Activity ◽  
Uptake Rate ◽  
Heart Muscle ◽  
Ca Uptake

Erratum to ‘Partial synthetic derivatization of canrenone and characterization of its impact on the inhibitory effect on Na+/K+-ATPase activity in human heart muscle’[Steroids 63 (1998) 464–469]

Steroids ◽  
1999 ◽  
Vol 64 (8) ◽  
pp. 558-559
Author(s):  
Jürgen Weiland ◽  
Rudolf Megges ◽  
Bernd Undeutsch ◽  
Rudolf Schön ◽  
Horst Büchting ◽  
...  
Keyword(s):  
Atpase Activity ◽  
Heart Muscle ◽  
Human Heart ◽  
Inhibitory Effect
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