期刊
DEVELOPMENT
卷 137, 期 14, 页码 2365-2374出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.047605
关键词
Neurite outgrowth; Neuronal migration; MRTF; Pctaire1 (Cdk16); Actin dynamics; Mouse
资金
- NIH
- Donald W. Reynolds Center for Clinical Cardiovascular Research
- American Heart Association
- Robert A. Welch foundation
- Leducq Foundation
Numerous motile cell functions depend on signaling from the cytoskeleton to the nucleus. Myocardin-related transcription factors (MRTFs) translocate to the nucleus in response to actin polymerization and cooperate with serum response factor (Srf) to regulate the expression of genes encoding actin and other components of the cytoskeleton. Here, we show that MRTF-A (Mkl1) and MRTF-B (Mkl2) redundantly control neuronal migration and neurite outgrowth during mouse brain development. Conditional deletion of the genes encoding these Srf coactivators disrupts the formation of multiple brain structures, reflecting a failure in neuronal actin polymerization and cytoskeletal assembly. These abnormalities were accompanied by dysregulation of the actin-severing protein gelsolin and Pctaire1 (Cdk16) kinase, which cooperates with Cdk5 to initiate a kinase cascade that governs cytoskeletal rearrangements essential for neuron migration and neurite outgrowth. Thus, the MRTF/Srf partnership interlinks two key signaling pathways that control actin treadmilling and neuronal maturation, thereby fulfilling a regulatory loop that couples cytoskeletal dynamics to nuclear gene transcription during brain development.
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