BAUMANN, O and WALZ, B and SOMLYO, AV and SOMLYO, AP (1991) ELECTRON-PROBE MICROANALYSIS OF CALCIUM RELEASE AND MAGNESIUM UPTAKE BY ENDOPLASMIC-RETICULUM IN BEE PHOTORECEPTORS. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 88 (3). pp. 741-744. ISSN 0027-8424,
Full text not available from this repository.Abstract
Honey bee photoreceptors contain large sacs of endoplasmic reticulum (ER) that can be located unequivocally in freeze-dried cryosections. The elemental composition of the ER was determined by electron probe x-ray microanalysis and was visualized in high-resolution x-ray maps. In the ER of dark-adapted photoreceptors, the Ca concentration was 47.5 +/- 1.1 mmol/kg (dry weight) (mean +/- SEM). During a 3-sec nonsaturating light stimulus, almost-equal-to 50% of the Ca content was released from the ER. Light stimulation also caused a highly significant increase in the Mg content of the ER; the ratio of Mg uptake to Ca released was almost-equal-to 0.7. Our results show unambiguously that the ER is the source of Ca2+ release during cell stimulation and suggest that Mg2+ can nearly balance the charge movement of Ca2+.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INOSITOL TRISPHOSPHATE; HONEYBEE DRONE; SARCOPLASMIC-RETICULUM; LIMULUS PHOTORECEPTORS; LIGHT STIMULATION; APIS-MELLIFERA; COMPOUND EYE; GLIAL-CELLS; RETINA; CA-2+; SIGNAL TRANSDUCTION; RETINA; INVERTEBRATES |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/55106 |
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