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Pref-1 interacts with fibronectin to inhibit adipocyte differentiation
Yuhui Wang1, Ling Zhao, Cynthia Smas
1Department of Nutritional Science and Toxicology, University of California, Berkeley, CA 94720, USA.
Molecular and Cellular Biology
|May 12, 2010
Summary
Pref-1 protein inhibits fat cell differentiation by interacting with fibronectin. This interaction activates integrin signaling, leading to ERK activation and blocking adipogenesis.
Area of Science:
- Cell biology
- Molecular signaling
- Biochemistry
Background:
- Pref-1/Dlk1 is a transmembrane protein cleaved into soluble forms that inhibit adipocyte differentiation.
- Previous studies suggested Notch signaling involvement in Pref-1 function.
Purpose of the Study:
- To elucidate the molecular mechanism of Pref-1-mediated inhibition of adipocyte differentiation.
- To determine if Notch signaling is required for Pref-1 function.
Main Methods:
- Investigated Pref-1 interaction with Notch and fibronectin.
- Utilized RGD peptides and alpha 5 integrin knockdown to disrupt fibronectin-integrin binding.
- Assessed Pref-1 effects on ERK/MAPK activation, Sox9 expression, and adipocyte differentiation.
- Examined downstream signaling molecules like FAK and Rac.
Main Results:
- Pref-1 does not interact with or require Notch for its inhibitory function.
- Pref-1 directly interacts with fibronectin, which is essential for inhibiting adipocyte differentiation.
- Fibronectin binding to integrin is necessary for Pref-1's effects.
- Pref-1 activates integrin downstream signaling molecules (FAK, Rac) and MEK/ERK pathway.
Conclusions:
- Pref-1 inhibits adipocyte differentiation by interacting with fibronectin and activating integrin-mediated signaling.
- The Pref-1-fibronectin-integrin axis is crucial for regulating adipogenesis via MEK/ERK activation.
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