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- W2795633066 abstract "Previously, we showed that thyroid hormone (TH) triiodothyronine (T3) enhanced β-cell functional maturation through induction of Mafa. High levels of T3 have been linked to decreased life span in mammals and low levels to lengthened life span, suggesting a relationship between TH and aging. Here, we show that T3 increased p16Ink4a (a β-cell senescence marker and effector) mRNA in rodent and human β-cells. The kinetics of Mafa and p16Ink4a induction suggested both genes as targets of TH via TH receptors (THRs) binding to specific response elements. Using specific agonists CO23 and GC1, we showed that p16Ink4a expression was controlled by THRA and Mafa by THRB. Using chromatin immunoprecipitation and a transient transfection yielding biotinylated THRB1 or THRA isoforms to achieve specificity, we determined that THRA isoform bound to p16Ink4a, whereas THRB1 bound to Mafa but not to p16Ink4a. On a cellular level, T3 treatment accelerated cell senescence as shown by increased number of β-cells with acidic β-galactosidase activity. Our data show that T3 can simultaneously induce both maturation (Mafa) and aging (p16Ink4a) effectors and that these dichotomous effects are mediated through different THR isoforms. These findings may be important for further improving stem cell differentiation protocols to produce functional β-cells for replacement therapies in diabetes." @default.
- W2795633066 created "2018-04-13" @default.
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- W2795633066 date "2018-04-06" @default.
- W2795633066 modified "2023-10-10" @default.
- W2795633066 title "T3 Induces Both Markers of Maturation and Aging in Pancreatic β-Cells" @default.
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- W2795633066 doi "https://doi.org/10.2337/db18-0030" @default.
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