Na(+)-Ca2+ exchange in locust striated muscles
Language English Country Slovakia Media print
Document type Comparative Study, Journal Article
PubMed
2269420
Knihovny.cz E-resources
- MeSH
- Biological Transport, Active MeSH
- Ion Exchange MeSH
- Kinetics MeSH
- Grasshoppers metabolism MeSH
- Rats MeSH
- Sodium-Calcium Exchanger MeSH
- Astacoidea metabolism MeSH
- Sodium metabolism MeSH
- Subcellular Fractions metabolism MeSH
- Muscles metabolism MeSH
- Tissue Distribution MeSH
- Carrier Proteins metabolism MeSH
- Calcium metabolism MeSH
- Animals MeSH
- Check Tag
- Rats MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Comparative Study MeSH
- Names of Substances
- Sodium-Calcium Exchanger MeSH
- Sodium MeSH
- Carrier Proteins MeSH
- Calcium MeSH
High Na+ + Ca2+ exchange rates comparable with those reported for crayfish striated muscle, rat heart and rat brain, were observed in locust striated muscle homogenates and membrane preparations. The Na(+)-Ca2+ exchange followed the 1st order kinetics with a Km value of 18 mumol.l-1 for Ca, the pH optimum was at 8, the temperature optimum at 30 degrees C, and the exchange was inhibited in the presence of sodium in the incubation medium, with a KiNa of approx. 25 mmol.l-1. The present results suggest a high Na(+)-Ca2+ exchange in locust striated muscles which operate on the calcium electrogenesis principle.
