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Calcium Pathways in Human Neutrophils-The Extended Effects of Thapsigargin and ML-9

Calcium Pathways in Human Neutrophils-The Extended Effects of Thapsigargin and ML-9

Daniela Ribeiro, Marisa Freitas, Sílvia Rocha, José L F C Lima, Félix Carvalho, Eduarda Fernandes

Cells. 2018 Nov 9;7(11):204.

PMID: 30423935

Abstract:

In neutrophils, intracellular Ca2+ levels are regulated by several transporters and pathways, namely SERCA [sarco(endo)plasmic reticulum Ca2+-ATPase], SOCE (store-operated calcium entry), and ROCE (receptor-operated calcium entry). However, the exact mechanisms involved in the communication among these transporters are still unclear. In the present study, thapsigargin, an irreversible inhibitor of SERCA, and ML-9, a broadly used SOCE inhibitor, were applied in human neutrophils to better understand their effects on Ca2+ pathways in these important cells of the immune system. The thapsigargin and ML-9 effects in the intracellular free Ca2+ flux were evaluated in freshly isolated human neutrophils, using a microplate reader for monitoring fluorimetric kinetic readings. The obtained results corroborate the general thapsigargin-induced intracellular pattern of Ca2+ fluctuation, but it was also observed a much more extended effect in time and a clear sustained increase of Ca2+ levels due to its influx by SOCE. Moreover, it was obvious that ML-9 enhanced the thapsigargin-induced emptying of the internal stores. Indeed, ML-9 does not have this effect by itself, which indicates that, in neutrophils, thapsigargin does not act only on the influx by SOCE, but also by other Ca2+ pathways, that, in the future, should be further explored.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP105637501-A	ML-9		105637-50-1	Price

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