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Default 19F-NMR study of the effect of lead on intracellular free calcium in human platelets.

19F-NMR study of the effect of lead on intracellular free calcium in human platelets.

Related Articles 19F-NMR study of the effect of lead on intracellular free calcium in human platelets.

Biochim Biophys Acta. 1991 May 17;1092(3):341-6

Authors: Dowd TL, Gupta RK

Lead has been shown to affect calcium homeostasis. However, there is no prior evidence to indicate an effect of low concentrations of lead in the environment (approximately 1 microM) on the intracellular free Ca2+ concentration in any human tissue. We have investigated the effect of lead on the intracellular free Ca2+ concentration of human blood platelets using 19F-NMR and a fluorinated intracellular Ca2+ indicator. We report a basal intracellular free Ca2+ value of 172 +/- 8 nM. Treatment with 1, 5, 10 and 25 microM Pb2+ resulted in average increases in intracellular free Ca2+ of 39%, 91%, 135% and 172%, respectively. The percent increase in intracellular free Ca2+ was linearly and positively correlated with the log of Pb2+ concentration. Using atomic absorption spectroscopy, a significant increase in total calcium of approx. 10 nmol/mg protein was found in 25 microM Pb2+ treated platelets. This indicates that influx of external Ca2+ contributes to the observed increase in free Ca2+. The results provide an explanation for the previously reported effects of lead on platelet function, and suggest a mechanism for low level lead-induced hypertension.

PMID: 1904777 [PubMed - indexed for MEDLINE]



Source: PubMed
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