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8684964a-bab1-4235-93a8-5fd5e24a1d0a |
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wylmraar-8327 |
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xevyo |
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| model_name |
Regulation of Cardiac |
| model_desc |
Regulation of Cardiac Muscle Contractility |
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xevyo |
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Regulation of Cardiac Muscle Contractility
ARNOL Regulation of Cardiac Muscle Contractility
ARNOLD M. KATZ
From the Department of Physiology, College of Physicians and Surgeons, Columbia
University, New York. Dr. Katz's present address is the Department of Medicine,
The University of Chicago
ABSTRACT The heart's physiological performance, unlike that of skeletal
muscle, is regulated primarily by variations in the contractile force developed
by the individual myocardial fibers. In an attempt to identify the basis for the
characteristic properties of myocardial contraction, the individual cardiac contractile proteins and their behavior in contractile models in vitro have been
examined. The low shortening velocity of heart muscle appears to reflect the
weak ATPase activity of cardiac myosin, but this enzymatic activity probably
does not determine active state intensity. Quantification of the effects of Ca ++
upon cardiac actomyosin supports the view that myocardial contractility can
be modified by changes in the amount of calcium released during excitationcontraction coupling. Exchange of intracellular K + with Na + derived from the
extracellular space also could enhance myocardial contractility directly, as
highly purified cardiac actomyosin is stimulated when K + is replaced by an
equimolar amount of Na +. On the other hand, cardiac glycosides and catecholamines, agents which greatly increase the contractility of the intact heart,
were found to be without significant actions upon highly purified reconstituted
cardiac actomyosin.
COMPARATIVE ASPECTS OF MUSCULAR CONTRACTION
INDIVIDUAL MYOFIBRILLAR PROTEINS
Tropomyosin
TABLE I
COMPARISON OF THE ATPASE ACTIVITIES OF RABBIT RED SKELETAL, WHITE SKELETAL, AND CARDIAC MYOSINS
Myosin
TABLE II
CALCIUM SENSITIVITIES OF THE INITIAL Mg++-ACTIVATED ATPASE ACTIVITY OF
RECONSTITUTED CARDIAC ACTOMYOSINS
Regulation of Cardiac Muscle Contractility
Calcium-Sensitizing Proteins
CARDIAC ACTOMYOSIN
TABLE III
COMPARISON OF THE MYOCARDIAL CALCIUM UPTAKE DURING
A POSITIVE RATE STAIRCASE AND THE CALCIUM REQUIRED TO PRODUCE A SIMILAR INCREASE IN CARDIAC
ACTOMYOSIN ATPASE ACTIVITY
Regulation of Cardiac Muscle Contractility
COMPARATIVE ASPECTS OF MUSCULAR CONTRACTION
Discussion
... |
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| status |
queued |
| created_at |
1769080428 |
| updated_at |
1769080428 |
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