Title : Defective high-affinity thiamine transporter leads to cell death in thiamine-responsive megaloblastic anemia syndrome fibroblasts.

Pub. Date : 1999 Mar

PMID : 10074490






7 Functional Relationships(s)
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1 We have investigated the cellular pathology of the syndrome called thiamine-responsive megaloblastic anemia (TRMA) with diabetes and deafness. Thiamine solute carrier family 19 member 2 Homo sapiens
2 TRMA fibroblasts were rescued from death with 10-30 nM thiamine (in the range of normal plasma thiamine concentrations). Thiamine solute carrier family 19 member 2 Homo sapiens
3 TRMA fibroblasts were rescued from death with 10-30 nM thiamine (in the range of normal plasma thiamine concentrations). Thiamine solute carrier family 19 member 2 Homo sapiens
4 At 30 nM thiamine, the rate of uptake of thiamine by TRMA fibroblasts was 10-fold less than that of wild-type, and cells from obligate heterozygotes had an intermediate phenotype. Thiamine solute carrier family 19 member 2 Homo sapiens
5 At 30 nM thiamine, the rate of uptake of thiamine by TRMA fibroblasts was 10-fold less than that of wild-type, and cells from obligate heterozygotes had an intermediate phenotype. Thiamine solute carrier family 19 member 2 Homo sapiens
6 Transfection of TRMA fibroblasts with the yeast thiamine transporter gene THI10 prevented cell death when cells were grown in the absence of supplemental thiamine. Thiamine solute carrier family 19 member 2 Homo sapiens
7 We therefore propose that the primary abnormality in TRMA is absence of a high-affinity thiamine transporter and that low intracellular thiamine concentrations in the mutant cells cause biochemical abnormalities that lead to apoptotic cell death. Thiamine solute carrier family 19 member 2 Homo sapiens