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Calcium mobilisation in natural killer cells from Chronic fatigue syndrome/Myalgic encephalomyelitis patients is associated with transient receptor potential melastatin 3 ion channels.

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By T. Nguyen et al. • www.ProHealth.com • October 20, 2016


By T. Nguyen et al.

Abstract

Transient receptor potential melastatin subfamily 3 (TRPM3) ion channels play a role in calcium (Ca2+ ) cell signalling. Reduced TRPM3 has been identified in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) patients. However, the significance of TRPM3 and association with intracellular Ca2+ mobilisation has yet to be determined. Fifteen CFS/ME patients (mean age 48.82 ± 9.83 years) and 25 health controls (mean age 39.2 ± 12.12 years) were examined.

Isolated NK cells were labelled with fluorescent antibodies to determine TRPM3, CD107a, and CD69 receptors on CD56Dim CD16+ NK cells and CD56Bright CD16Dim/- NK cells. Ca2+flux and NK cytotoxicity activity was measured under various stimulants including PregS, Thapsigargin, 2APB and ionomycin. Unstimulated CD56Bright CD16Dim/- NK cells, significantly reduced TRPM3 receptors were seen in CFS/ME compared with HC. Ca2+flux showed no significant difference between groups.

Moreover PregS stimulated CD56Bright CD16Dim/- NK cells showed significant increase in Ca2+ flux in CFS/ME patients compared with HC. By comparison, unstimulated CD56Dim CD16+ NK cell showed no significant difference in both Ca2+ flux and TRPM3 expression. PregS stimulated CD56Dim CD16+ NK cells significantly increased TRPM3 expression in CFS/ME but this was not associated with a significant increase in Ca2+ flux. Furthermore, TG stimulated CD56Dim CD16+ NK cells increased K562 cell lysis prior to PregS stimulation in CFS/ME patients compared with healthy controls. Differential expression of TRPM3 and Ca2+ flux between NK cell sub-types may provide evidence for their role in the pathomechanism involving NK cell cytotoxicity activity in CFS/ME. 

This article is protected by copyright. All rights reserved. 
© 2016 British Society for Immunology.

Source: Nguyen T, Johnston S, Clarke L, Smith P, Staines D, Marshall-Gradisnik S. Calcium mobilisation in natural killer cells from Chronic fatigue syndrome/Myalgic encephalomyelitis patients is associated with transient receptor potential melastatin 3 ion channels.Clin Exp Immunol. 2016 Oct 11. doi: 10.1111/cei.12882. [Epub ahead of print]




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