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Nucleic Acids Research, 1993, Vol. 21, No. 3 489-495
© 1993

MOLECULAR BIOLOGY

Cloning of two novel forms of human acidic fibroblast growth factor (aFGF) mRNA

Robert A. Payson, Halit Canatan, Maqsood A. Chotani, Wen-Pin Wang, Stephen E. Harris1, René L. Myers and Ing-Ming Chiu*

Department of Internal Medicine, The Ohio State University Davis Medical Research Center, 480 West 9th Avenue, Room S2052, Columbus, OH 43210 1Division of Endocrinology, Department of Medicine, University of Texas Health Science Center San Antonio, TX, USA

*To whom correspondence should be addressed

Received October 27, 1992. Accepted December 29, 1992.

We have previously isolated two different aFGF cDNA clones from kidney and brain. The two corresponding mRNA, designated aFGF 1.A and 1.B, are the predominant species in kidney and brain, respectively. During the characterization of aFGF mRNA in glioblastoma ceils, we demonstrated that aFGF mRNA in U1242MG and D65MG gliobiastoma cells contain 5'-untransiated sequences different from those of 1 .A and 1.B. Through a strategy combining chromosome wafldng, Identification and sequencing of evolutlonarily conserved DNA regions, and a reverse transcription and polymerase chain reaction (RT-PCR)-based assay for RNA expression, we have isoiated two novel aFGF cDNA clones. The cDNA clone representing aFGF mRNA 1.C was isolated from U1242MG cells; another aFGF cDNA, designated 1.D, was isolated from D65MG cells. Promoter 1C has extensive sequence homology to the hamster aFGF gene promoter that was shown to respond to testosterone stimulation by chioramphenicol acetyltransferase reporter gene assays. Using RT-PCR, we showed that normal, benign and cancerous prostate tissues do not express aFGF 1.C mRNA. in contrast, a prostate carcinoma cell line (PC-3) expresses 1.C mRNA. RT-PCR using 1.D-specific primers showed that kidney, brain and prostate do not express 1.D mRNA even though kidney and brain are the most abundant source for aFGF protein. RNase protection analysis further showed that 1.D mRNA is the predominant aFGF transcript In D65MG giiobiastoma cells and in NFF-6 neonatal foreskin fibrobiast cells. The genomic DNA corresponding to these two cDNA clones and the 5'-fianklng regions were also isolated and their sequences determined. These DNA clones will provide important reagents for studying the regulatory elements of aFGF gene expression.


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