Early involvement of estrogen-induced pituitary tumor transforming gene and fibroblast growth factor expression in prolactinoma pathogenesis
Summary
This summary is machine-generated.Estrogen and fibroblast growth factor-2 (bFGF) promote pituitary tumor growth by regulating pituitary tumor transforming gene (PTTG). PTTG is induced by estrogen and bFGF, suggesting a paracrine mechanism in pituitary tumor development.
Area Of Science
- Endocrinology
- Oncology
- Molecular Biology
Background
- Pituitary tumors arise from mutated cells and are influenced by hormones and growth factors.
- Estrogen and fibroblast growth factor-2 (bFGF) play roles in pituitary tumor growth and prolactin regulation.
- Pituitary tumor transforming gene (PTTG) is implicated in tumorigenesis and chromatid separation inhibition.
Purpose Of The Study
- To investigate the regulation of pituitary PTTG by estrogen and bFGF.
- To elucidate the role of PTTG in early pituitary tumor development and angiogenesis.
- To propose a paracrine growth factor-mediated mechanism for pituitary tumorigenesis.
Main Methods
- In vivo and in vitro studies on rat pituitary cells.
- Measurement of PTTG mRNA levels.
- Analysis of bFGF and vascular endothelial growth factor expression.
- Examination of experimental and human pituitary adenomas.
Main Results
- Estrogen significantly regulates pituitary PTTG in vivo and in vitro.
- PTTG mRNA induction in rats coincides with early pituitary transformation, bFGF, VEGF induction, and angiogenesis.
- PTTG expression is induced by bFGF, with concordant expression observed in pituitary adenomas.
Conclusions
- Estrogen and bFGF induce PTTG, suggesting a novel paracrine mechanism in pituitary tumor pathogenesis.
- PTTG plays a role in early pituitary hyperplastic responses, angiogenesis, and prolactinoma development.
- This mechanism may also be relevant for other estrogen-regulated tumors.
View abstract on PubMed