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Journal of Histochemistry and Cytochemistry, Vol. 48, 407-414, March 2000, Copyright © 2000, The Histochemical Society, Inc.

ARTICLE

Acidic Fibroblast Growth Factor is Present in the Enteric Nervous System of the Large Intestine

Anthony Capetandesa, Jerry Di Salvob, John J. Ronanc, and Kenneth A. Thomasd
a Department of Biomedical Sciences, Long Island University/CW Post Campus, Greenvale, New York
b Departments of Immunology/Rheumatology, Merck Research Laboratories, Rahway, New Jersey
c Pharmacology, Merck Research Laboratories, Rahway, New Jersey
d Department of Cancer Research, Merck Research Laboratories, West Point, Pennsylvania

Correspondence to: Anthony Capetandes, Long Island University/CW Post Campus, LS338, Dept. of Biomedical Sciences, Greenvale NY 11548.

Acidic fibroblast growth factor (aFGF) is a heparin binding protein that displays pleiotropic activity. The purpose of this study was to document the presence of the translated aFGF product, its mRNA, and its location in the colon. mRNA was extracted from bovine large intestine and reverse transcribed to cDNA. Nested-primer PCR was used to determine the presence of mRNA using primers homologous to the previously published bovine aFGF cDNA. Purification of translated aFGF was performed using an established HPLC protocol. Western blot analysis of the HPLC fractions was performed using two epitope-independent antibodies against aFGF. Immunohistochemistry employed these antibodies to determine the locus of aFGF expression. The nested-primer PCR product of predicted size was homologous to the published bovine aFGF mRNA sequence, as determined by DNA sequencing. Intestinal aFGF had a mass similar to bovine aFGF isolated from other tissues, and immunocrossreacted with two peptide-based, epitope-independent anti-aFGF antisera on Western blotting. Immunohistochemical analysis of large intestine using these two independent antisera localized aFGF within the myenteric plexus. These data demonstrate that aFGF is present within the myenteric plexus of the enteric nervous system. (J Histochem Cytochem 48:407–413, 2000)

Key Words: neurotrophic factor, mitogen, nervous system, intestine, fibroblast growth factor


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