Second messenger role for Mg2+ revealed by human T-cell immunodeficiency.
Second messenger role for Mg2+ revealed by human T-cell immunodeficiency.
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DOI:
10.1038/nature10246
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发表时间:
2011-07-27
期刊:
影响因子:
64.8
通讯作者:
Lenardo, Michael J.
中科院分区:
文献类型:
--
作者:
Li, Feng-Yen;Chaigne-Delalande, Benjamin;Kanellopoulou, Chrysi;Davis, Jeremiah C.;Matthews, Helen F.;Douek, Daniel C.;Cohen, Jeffrey I.;Uzel, Gulbu;Su, Helen C.;Lenardo, Michael J.
The magnesium ion, Mg2+, is essential for all life as a cofactor for ATP, polyphosphates such as DNA and RNA, and metabolic enzymes, but whether it plays a role in intracellular signaling similar to Ca2+ is unknown. In this study, we identify mutations in the magnesium transporter gene, MAGT1, in a novel X-linked human immunodeficiency characterized by CD4 lymphopenia, severe chronic viral infections, and defective T lymphocyte activation. We demonstrate that a rapid transient Mg2+ influx is induced by antigen receptor stimulation in T cells or growth factor stimulation in non-lymphoid cells. MagT1 deficiency abrogates the Mg2+ influx leading to impaired responses to antigen receptor engagement including defective activation of phospholipase Cγ and a markedly impaired Ca2+ influx in T cells but not B cells. These observations reveal a role for Mg2+ as an intracellular second messenger and identify MagT1 as a possible target for novel therapeutics.
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