Effect of calcium deprivation on frog skeletal muscles at different pH values

Argibay, Jorge; Caputo, Carlo

doi:10.1007/bf02431962

Cited by 4 publications

(1 citation statement)

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“…We have no ready explanation for the difference between these results and those of Claret & Coraboeuf (1968) except for a necessity for perfusion or the differences in species. (Argibay & Caputo, 1971;Dean & Matthews, 1970;Williams, 1969;Douglas et al 1967;Borle & Loveday, 1968). The rat liver has both Ca2+ and Mg2+ pumps (van Rossum, 1970 Table 2).…”

Section: Effect Of Phmentioning

confidence: 99%

Transmembrane potentials in guinea‐pig hepatocytes

Heller¹,

Kloot²

1974

The Journal of Physiology

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SUMMARY1. In pieces of guinea-pig liver with an intact capsule, the mean resting potential (E) is -49-8 mV, close to the value for in vivo hepatocytes and significantly higher than a similar preparation of rat liver. E is considerably less than the calculated K equilibrium potential of about -90 mV.2. Changes in [K+]. in the range of 0-10 mm produce almost no change in E. At [K+] [Cli]. in opposite directions to maximize predicted changes in E also has only a minimal effect on E.4. Cyanide (5 mM) or ouabain (10-4 M) cause depolarization, so there is no reason to believe that pumps sensitive to these poisons are normally lowering resting potential. Part of the normal E may be produced by an electrogenic ouabain-sensitive ion pump.5. The data is interpreted by using a form of the constant field equation developed by Brading & Caldwell (1971). Application of this method yields PNa/PK less than 0-04, PC1/PK approximately 0 3. Additional terms,x and y, are required to account for the behaviour of E. Their physical basis remains undetermined.

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Section: Effect Of Phmentioning

confidence: 99%

Transmembrane potentials in guinea‐pig hepatocytes

Heller¹,

Kloot²

1974

The Journal of Physiology

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Effect of external sodium and calcium on calcium efflux in frog striated muscle

Caputo

Bolaños

1978

J. Membrain Biol.

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The effect of media with different ionic composition on calcium efflux from the dorsal head of semitendinosus muscles of Rana pipiens was studied. The reduction in the fractional loss of 45Ca, when going from normal Ringer's solution to an ONa--OCa medium, was 60%. Withdrawal of only Na or Ca from the external medium also caused a significant drop in the fractional loss (33% and 34%, respectively). The effect of different concentrations of Ca (studied on the absence of the external Na) was also studied. It was found that a linear function could describe the relationship between the calcium-dependent calcium efflux and the external calcium concentration. These results indicate that calcium efflux from frog muscle fibers consists of three major components: one that is dependent on the presence of calcium in the external medium, one that is dependent on the presence of sodium in the external medium, and one that persists in the absence of these two cations.

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