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The forkhead transcription factor Foxo1 regulates adipocyte differentiation
Jun Nakae1, Tadahiro Kitamura, Yukari Kitamura
1Department of Medicine, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.
Developmental Cell
|January 18, 2003
Summary
Forkhead box protein 1 (Foxo1) is crucial for adipocyte differentiation, integrating hormonal signals to regulate gene expression. Its delayed activation is key to preventing preadipocyte differentiation and protecting against diet-induced diabetes.
Area of Science:
- Adipocyte biology
- Molecular endocrinology
- Transcriptional regulation
Background:
- Hormonal regulation of adipogenesis involves nuclear transcriptional programs.
- Insulin signaling modulates the forkhead transcription factor Foxo1 through Akt-dependent phosphorylation and nuclear exclusion.
Purpose of the Study:
- To investigate the role of Foxo1 in adipocyte differentiation.
- To understand how Foxo1 integrates hormonal cues with transcriptional regulation during adipogenesis.
Main Methods:
- Studied Foxo1 induction and activation timing during adipocyte differentiation.
- Utilized constitutively active and dominant-negative Foxo1 constructs.
- Examined Foxo1 haploinsufficiency in diet-induced diabetes models.
Main Results:
- Foxo1 is induced early but activated late in adipocyte differentiation.
- Constitutively active Foxo1 inhibits preadipocyte differentiation.
- Dominant-negative Foxo1 rescues adipocyte differentiation in insulin receptor-deficient cells.
- Foxo1 haploinsufficiency confers protection against diet-induced diabetes.
Conclusions:
- Foxo1 acts as a critical regulator in adipocyte differentiation.
- Foxo1 integrates insulin signaling with adipogenic transcriptional pathways.
- Targeting Foxo1 may offer therapeutic strategies for metabolic diseases like diabetes.