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. 1981 Feb;67(2):379–384. doi: 10.1104/pp.67.2.379

Amino Acid Transport into Cultured Tobacco Cells

II. EFFECT OF CALCIUM 1

H Michael Harrington 1,2, Sandra L Berry 1, Randolph R Henke 1,3
PMCID: PMC425687  PMID: 16661679

Abstract

The effects of calcium ions on lysine transport into cultured Wisconsin-38 tobacco cells were examined. In the presence of calcium, lysine was transported at a relatively low rate for 30 to 40 minutes followed by a period of increasing rates and subsequent stabilization at a higher rate after 2 to 3 hours. In the absence of calcium, transport was uniformly low.

Time-dependent stimulation of lysine transport rate was observed after the cells had been preincubated in calcium-containing media. Similar treatments also resulted in the stimulated uptake of a variety of other amino acids, organic compounds, and sulfate. The stimulation of lysine uptake was apparently not due to nutrient starvation.

Lysine transport was not stimulated in a time-dependent fashion by K+, La3+, Mg2+, or Mn2+. Cells with stimulated transport rates continued to exhibit high rates when washed with calcium-containing media followed by transport in calcium-containing media. All other cation wash treatments were inhibitory, although magnesium treatments resulted in partial preservation of stimulated transport rates. Cycloheximide inhibited the calcium/time-dependent stimulation of lysine transport and caused the stimulated rate to decay.

The initial experimental treatments or the culture conditions may represent some form of shock that alters the membrane transport mechanism, thus reducing transport. The observed calcium/time-dependent stimulation may require protein synthesis and represents damage repair.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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