Transient receptor potential melastatin subfamily 3 (TRPM3) ion channels play a role in calcium<\/a> (Ca2+ ) cell signalling<\/a>. Reduced TRPM3<\/a> 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.<\/p>\n Fifteen CFS\/ME patients (mean age 48.82\u2009\u00b1\u20099.83 years) and 25 health controls (mean age 39.2\u2009\u00b1\u200912.12 years) were examined.<\/p>\n 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.<\/p>\n 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.<\/p>\n 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.<\/p>\n 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.<\/p>\n Calcium mobilisation in natural killer cells from Chronic fatigue syndrome\/Myalgic encephalomyelitis patients is associated with transient receptor potential melastatin 3 ion channels<\/a>, by T Nguyen, S Johnston, L Clarke, P\u00a0Smith, D Staines, S\u00a0Marshall-Gradisnik in<\/span> Clin Exp Immunol<\/em>. 2016 Oct 11.\u00a0[Epub ahead of print]<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Research 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 … Continue reading