Ca2+ pools and cell growth. Evidence for sarcoendoplasmic Ca2+-ATPases 2B involvement in human prostate cancer cell growth control

The Journal of Biological Chemistry
G LegrandN Prevarskaya

Abstract

The present study demonstrates for the first time that intracellular calcium-ATPases and calcium pool content are closely associated with prostate cancer LNCaP cell growth. Cell growth was modulated by changing the amount of epidermal growth factor, serum, and androgene in culture media. Using the microspectrofluorimetric method with Fura-2 and Mag Fura-2 as probes, we show that in these cells, the growth rate is correlated with intracellular calcium pool content. Indeed, an increased growth rate is correlated with an increase in the calcium pool filling state, whereas growth-inhibited cells show a reduced calcium pool load. Using Western blotting and immunocytochemistry, we show that endoplasmic reticulum calcium pump expression is closely linked to LNCaP cell growth, and are a common target of physiological stimuli that control cell growth. Moreover, we clearly demonstrate that inhibition of these pumps, using thapsigargin, inhibits LNCaP cell growth and prevents growth factor from stimulating cell proliferation. Our results thus provide evidence for the essential role of functional endoplasmic reticulum calcium pumps and calcium pool in control of prostate cancer LNCaP cell growth, raising the prospect of new targets for the...Continue Reading

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