Nucleotide sequence of a bovine clone encoding the angiogenic protein, basic fibroblast growth factor

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Basic and acidic fibroblast growth factors (FGFs) are key regulators of endothelial cell proliferation and angiogenesis.
• These growth factors play a role in tissue repair processes.
• Understanding the molecular basis of FGF production is crucial for regenerative medicine.

Purpose of the Study:

• To isolate the complementary DNA (cDNA) for basic FGF.
• To investigate the messenger RNA (mRNA) expression of basic FGF in different tissues.
• To compare the structure of basic and acidic FGF.

Main Methods:

• Oligonucleotide probe design based on sequence homology between acidic and basic FGF.
• Isolation of full-length basic FGF cDNA from bovine pituitary using the probe.
• Analysis of basic FGF mRNA size and abundance in bovine hypothalamus and a human hepatoma cell line.

Main Results:

• A full-length cDNA for basic FGF was successfully isolated.
• Basic FGF is encoded by a single 5.0-kilobase mRNA in the bovine hypothalamus.
• Two distinct basic FGF mRNA forms (4.6- and 2.2-kilobase) were detected in a human hepatoma cell line.
• Both FGFs appear to be synthesized with amino-terminal extensions not present in the mature, isolated forms.
• Neither basic nor acidic FGF possesses a classical signal peptide.

Conclusions:

• The study successfully isolated basic FGF cDNA and characterized its mRNA expression.
• Findings suggest differential regulation of basic FGF mRNA in different species and cell types.
• The absence of a signal peptide implies a non-classical secretion pathway for these growth factors.