DOI: 10.1073/pnas.88.3.741. Electron probe microanalysis of calcium release and magnesium uptake by endoplasmic reticulum in bee photoreceptors.

Electron probe microanalysis of calcium release and magnesium uptake by endoplasmic reticulum in bee photoreceptors.

10.1073/pnas.88.3.741

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

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, approximately 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 approximately 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+.

Bibliography

Baumann, O., Walz, B., Somlyo, A. V., & Somlyo, A. P. (1991). Electron probe microanalysis of calcium release and magnesium uptake by endoplasmic reticulum in bee photoreceptors. Proceedings of the National Academy of Sciences, 88(3), 741â744.

Authors 4

O Baumann (first)
B Walz (additional)
A V Somlyo (additional)
A P Somlyo (additional)

References 0 Referenced 52

None

Dates

Type	When
Created	19 years, 3 months ago (May 31, 2006, 7:52 a.m.)
Deposited	3 years, 4 months ago (April 13, 2022, 1:15 p.m.)
Indexed	11 months, 3 weeks ago (Sept. 9, 2024, 2:37 p.m.)
Issued	34 years, 7 months ago (Feb. 1, 1991)
Published	34 years, 7 months ago (Feb. 1, 1991)
Published Online	34 years, 7 months ago (Feb. 1, 1991)
Published Print	34 years, 7 months ago (Feb. 1, 1991)

Funders 0

None

BibTeX

@article{Baumann_1991, title={Electron probe microanalysis of calcium release and magnesium uptake by endoplasmic reticulum in bee photoreceptors.}, volume={88}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.88.3.741}, DOI={10.1073/pnas.88.3.741}, number={3}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Baumann, O and Walz, B and Somlyo, A V and Somlyo, A P}, year={1991}, month=feb, pages={741–744} }

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