ISSN:
1432-2013
Keywords:
Vascular smooth muscle
;
Force velocity relation
;
pH
;
Calcium
;
Noradrenaline
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The kinetics of vascular smooth muscle activity was studied by means of afterloaded isotonic contractions of the tetanized rat portal vein at varied pH (8.0–5.9), pCa (3.4–2.1), and during noradrenaline incubation (0.4 μg/ml). Under control conditions (pH 7.3, pCa 2.6) the following parameters of the force velocity relation were calculated:a of Hill's equation (relating to the isometric peak tension)=0.36;b (relating to the actual muscle length)=0.19 ML/s;V M (relating to the actual muscle length)=0.56 ML/s. Within the range of pCa between 2.0 and 3.2 the amount of force generation (=ΔP) depended on the extracellular calcium level whereas the extrapolated velocity of shortening of the unloaded preparation (=V M) did not. Also pH changes between 8.0 and 6.8 as well as noradrenaline incubation at a pH of 5.9 affectedΔP quite considerably, butV M only scarcely. At a pH of 6.3, however,V M was distinctly diminished, and a reduced calcium sensitivity of the ATPase was inferred from the shift of ED50 of extracellular calcium from 0.66 mM Ca at a pH of 7.3 to 1.56 mM Ca at a pH of 6.3 (P〈0.0005). It is concluded from these results that the experimental conditions—pCa between 2.0 and 3.2, pH between 8.0 and 6.8, and noradrenaline added at a pH of 5.9—obviously change the intracellular calcium concentration which influences the number of activated interaction sites rather than the velocity of crossbridge movement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00585181
