ArticleMolecular and cellular biology2010
Cell cycle arrest by transforming growth factor beta1 near G1/S is mediated by acute abrogation of prereplication complex activation involving an Rb-MCM interaction.
Article in Molecular and cellular biology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers.
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Who cites it
49 citing papers in PubMed, 78 citations in OpenAlex.
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Corrections and comments
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Understanding inhibitory mechanisms of transforming growth factor beta1 (TGF-beta1) has provided insight into cell cycle regulation and how TGF-beta1 sensitivity is lost during tumorigenesis. We show here that TGF-beta1 utilizes a previously unknown mechanism targeting the function of prereplication complexes (pre-RCs) to acutely block S-phase entry when added to cells in late G(1), after most G(1) events have occurred. TGF-beta1 treatment in early G(1) suppresses Myc and CycE-Cdk2 and blocks pre-RC assembly. However, TGF-beta1 treatment in late G(1) acutely blocks S-phase entry by inhibiting activation of fully assembled pre-RCs, with arrest occurring prior to the helicase unwinding step at G(1)/S. This acute block by TGF-beta1 requires the function of Rb in late G(1) but does not involve Myc/CycE-Cdk2 suppression or transcriptional control. Instead, Rb mediates TGF-beta1 late-G(1) arrest by targeting the MCM helicase. Rb binds the MCM complex during late G(1) via a direct interaction with Mcm7, and TGF-beta1 blocks their dissociation at G(1)/S. Loss of Rb or overexpression of Mcm7 or its Rb-binding domain alone abrogates late-G(1) arrest by TGF-beta1. These results demonstrate that TGF-beta1 acutely blocks entry into S phase by inhibiting pre-RC activation and suggest a novel role for Rb in mediating this effect of TGF-beta1 through direct interaction with and control of the MCM helicase.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.