Journal
REJUVENATION RESEARCH
Volume 11, Issue 2, Pages 455-459Publisher
MARY ANN LIEBERT INC
DOI: 10.1089/rej.2008.0679
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It is known that metallothionein (MT) mRNA expression first increases with age, but then decreases again in the very elderly. Here we report that MT protein levels also decrease in very old age, and that this is independent of dietary zinc intake. Age-related changes of MT, as well as alterations of zinc homeostasis (intracellular labile zinc and NO-induced zinc release), occur both in human PBMCs ex vivo and also in CD4+ T cell clones progressing through their finite life span in vitro. These results suggest that phenomena observed in very old people can be at least partially attributed to diminished cell proliferation.
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