BASIC FIBROBLAST GROWTH-FACTOR IDENTIFIED IN CHRONICALLY STIMULATED CARDIOMYOPLASTIES

In the presence of myocardial ischemia, chronic electrical stimulation of a latissimus dorsi (LD) cardiomyoplasty enhances extramyocardial c ollateral blood now. We postulated that basic fibroblast growth factor (bFGF) may mediate extramyocardial collateral formation. To test this hypothesis, LDs from goats with cardiomyoplasties were probed for the presence of bFGF by Western blot analysis and immunohistochemistry. T hree groups were studied: static LD cardiomyoplasty (group 1); LD card iomyoplasty stimulated at a 2-Hz frequency for 6 weeks (group 2); and LD cardiomyoplasty electrically stimulated and given human recombinant bFGF (group 3). There was no evidence of bFGF in the left LDs of grou p 1 by Western blot. Basic fibroblast growth factor-like immunoreactiv e evidence was found in the left LDs of group 2 goats by both Western blot and immunohistochemistry. In the right LDs of group 2, bFGF-like material was found by immunohistochemistry but not by Western blot, wh ich suggests that the tissue concentrations were low (near the limits of detection). The left LDs of group 3 were positive for bFGF by Weste rn blot and immunohistochemistry. Group 3 right LDs were positive for bFGF by immunohistochemistry. Immunohistochemical findings in group 2 indicate that bFGF is present in goat skeletal muscle. Western blot da ta from groups 1 and 2 suggest that bFGF may be increased in chronical ly stimulated cardiomyoplasties. From findings in group 3, we conclude that exogenous bFGF does not downregulate, and may upregulate, endoge nous production. These results support the possibility that skeletal m uscle bFGF is an important factor in extramyocardial collateral format ion.