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• W2004644482 abstract "Coordination of events leading to differentiation is mediated by the concerted action of multiple signal transduction pathways. In general, the uncoupling of mechanisms linking differentiation to cell cycle exit is a hallmark of cancer, yet the identity and regulation of molecules integrating signal transduction pathways remains largely unknown. One notable exception is DARPP-32 (dopamine and cAMP-regulated neuronal phosphoprotein, molecular mass, 32 kDa), a third messenger that integrates multiple signaling pathways in the brain. Thyroid cells represent an excellent model for understanding the coupling of signal transduction pathways leading to both proliferation and differentiation. The cooperative action of IGF-I and TSH together, but not alone, enable thyroid cells to proliferate while maintaining their differentiated state. How signaling downstream from these molecules is integrated is not known. Here we show that DARPP-32 expression is targeted by TSH and IGF-I in thyrocytes. Significantly, dedifferentiated, tumoral, or Ras-transformed thyrocytes fail to express DARPP-32 whereas short interfering RNA-mediated silencing of DARPP-32 expression in normally differentiated thyroid cells results in loss of differentiation markers such as thyroid transcription factor 1, Pax8, thyroglobulin, and the Na/I symporter. Consistently, DARPP-32 reexpression in ras-transformed cells results in reactivation of the otherwise silent thyroglobulin and thyroperoxidase promoter. Thus, DARPP-32 is critical for the maintenance of thyroid differentiation by TSH and IGF-I, and loss of DARPP-32 expression may be a characteristic of thyroid cancer. Our results also raise the possibility that DARPP-32 may play a similar role in the maintenance of differentiation of a range of other cell types." @default.
• W2004644482 created "2016-06-24" @default.
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• W2004644482 date "2005-12-01" @default.
• W2004644482 modified "2023-10-17" @default.
• W2004644482 title "DARPP-32 (Dopamine and 3′,5′-Cyclic Adenosine Monophosphate-Regulated Neuronal Phosphoprotein) Is Essential for the Maintenance of Thyroid Differentiation" @default.
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• W2004644482 doi "https://doi.org/10.1210/me.2005-0129" @default.
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