Epidermal growth factor and transforming growth factor alpha down-regulate human gastric lipase gene expression
Summary
This summary is machine-generated.Epidermal growth factor (EGF) and transforming growth factor alpha (TGF-alpha) down-regulate human gastric lipase (HGL) expression by stimulating the p42/p44 mitogen-activated protein kinase (MAPK) cascade, affecting HGL mRNA levels.
Area Of Science
- Gastroenterology
- Molecular Biology
- Cell Biology
Background
- Human gastric lipase (HGL) activity is modulated by epidermal growth factor (EGF).
- Understanding the cellular localization and regulation of HGL is crucial for gastric physiology.
Purpose Of The Study
- Determine the cellular localization of HGL.
- Assess the correlation between HGL mRNA and protein levels.
- Elucidate the molecular mechanism of EGF and TGF-alpha on HGL expression via the MAPK pathway.
Main Methods
- Immunohistochemistry for HGL cellular localization.
- Enzymatic assays, Western blotting, and Northern hybridization for HGL expression analysis.
- Assessment of p42/p44(mapk) activation status and inhibition studies using PD98059.
Main Results
- HGL is localized in secretory granules of gastric chief cells.
- HGL mRNA, protein levels, and enzymatic activity show a strong correlation.
- EGF and TGF-alpha down-regulate HGL mRNA and activity, mediated by p42/p44(mapk) activation.
Conclusions
- HGL expression is regulated at the mRNA level.
- EGF and TGF-alpha exert down-regulatory effects on HGL via the p42/p44(mapk) cascade.
View abstract on PubMed