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Functional components of basic fibroblast growth factor signaling that inhibit lung elastin gene expression
American Journal of Physiology. Lung Cellular and Molecular Physiology
|September 15, 2001
Summary
Basic fibroblast growth factor (bFGF) reduces elastin gene transcription by activating the MAPK/ERK pathway, impacting cell-specific responses. This pathway influences transcription factors like Fra-1, crucial for elastin regulation.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- Basic fibroblast growth factor (bFGF) is known to decrease elastin gene transcription in confluent rat lung fibroblasts.
- This repression was previously linked to a Fra-1-c-Jun heterodimer binding to an activator protein-1 cAMP response element in the elastin promoter.
Discussion:
- bFGF activates the MAPK/ERK pathway, leading to Elk-1 binding to the c-Fos promoter and subsequent induction of c-Fos and Fra-1 mRNA.
- PD-98059, a MAPK/MEK inhibitor, blocks bFGF's repression of elastin mRNA, confirming the pathway's role.
- Differences in elastin mRNA levels and AP-1 factors exist between confluent and subconfluent fibroblasts.
Key Insights:
- bFGF modulates elastin transcription via the MAPK/ERK pathway, influencing Fra-1 expression.
- Cellular state (confluent vs. subconfluent) dictates fibroblast responses to bFGF regarding elastin regulation.
- The study identifies specific molecular events regulated by bFGF dependent on cell state.
Outlook:
- Findings provide a basis for understanding differential bFGF responses in development, injury, and repair.
- Further research can explore therapeutic strategies targeting the MAPK/ERK pathway in conditions involving elastin modulation.
- Investigating cell-state-dependent signaling provides insights into tissue homeostasis and regeneration.