Publication Date:
2011-07-29
Description:
The magnesium ion, Mg(2+), is essential for all life as a cofactor for ATP, polyphosphates such as DNA and RNA, and metabolic enzymes, but whether it plays a part in intracellular signalling (as Ca(2+) does) is unknown. Here 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 Mg(2+) influx is induced by antigen receptor stimulation in normal T cells and by growth factor stimulation in non-lymphoid cells. MAGT1 deficiency abrogates the Mg(2+) influx, leading to impaired responses to antigen receptor engagement, including defective activation of phospholipase Cgamma1 and a markedly impaired Ca(2+) influx in T cells but not B cells. These observations reveal a role for Mg(2+) as an intracellular second messenger coupling cell-surface receptor activation to intracellular effectors and identify MAGT1 as a possible target for novel therapeutics.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159560/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159560/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉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 -- ZIA AI000769-14/Intramural NIH HHS/ -- ZIA AI000769-15/Intramural NIH HHS/ -- England -- Nature. 2011 Jul 27;475(7357):471-6. doi: 10.1038/nature10246.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Development Section, Lymphocyte Molecular Genetics Unit, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21796205" target="_blank"〉PubMed〈/a〉
Keywords:
Calcium/immunology
;
Cation Transport Proteins/genetics
;
Female
;
Gene Knockdown Techniques
;
HEK293 Cells
;
Humans
;
Magnesium/*immunology
;
Male
;
Phospholipase C gamma/genetics/metabolism
;
Second Messenger Systems/*immunology
;
T-Lymphocytes/*immunology
;
T-Lymphocytopenia, Idiopathic CD4-Positive/genetics/*immunology
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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