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Leptin activates Stat3, Stat1 and AP-1 in mouse adipose tissue
P Bendinelli1, P Maroni, F Pecori Giraldi
1Istituto di Patologia Generale, Università degli Studi di Milano, Centro di Studio sulla Patologia Cellulare del C.N.R., Via Mangiagalli 31, 20133, Milan, Italy.
Molecular and Cellular Endocrinology
|November 7, 2000
Summary
Leptin directly activates gene expression in adipose tissue by influencing Stat1 and Stat3 signaling pathways. This study reveals leptin
Area of Science:
- Endocrinology
- Molecular Biology
- Cellular Signaling
Background:
- Leptin is a key hormone regulating energy balance and metabolism.
- Understanding leptin's direct effects on adipose tissue is crucial for metabolic research.
Purpose of the Study:
- To investigate the in vivo molecular mechanisms by which leptin modulates gene expression in adipose tissue.
- To identify the specific signaling pathways activated by leptin in adipocytes.
Main Methods:
- Administration of leptin to wild-type and ob/ob mice.
- Immunoblotting to detect protein phosphorylation and nuclear translocation.
- Gel shift and supershift assays to analyze transcription factor binding activity.
Main Results:
- Leptin rapidly activated Signal Transducer and Activator of Transcription (Stat) 1 and Stat3 in epididymal adipose tissue.
- Leptin induced tyrosine phosphorylation and nuclear translocation of Stat3 in all mice, and Stat1 in ob/ob mice.
- Leptin treatment increased binding activity of Stat3 homodimers, Stat1/3 heterodimers, Stat1 homodimers, and AP-1 in adipose nuclear extracts.
Conclusions:
- Leptin directly acts on adipose tissue in vivo.
- Leptin signaling involves the activation of Stat proteins and AP-1, leading to the modulation of gene expression.