GAP43 and myocardial infarction: The specific results of this study are as follows: (a) lncRNA LOC100911717 was upregulated in M1-type macrophages and in the infarct border zone after MI in rats; (b) the lncRNA LOC100911717 knockdown reduced GAP43 expression; (c) the lncRNA LOC100911717 knockdown decreased sympathetic remodeling and reduced the incidence of VAs; and (d) the lncRNA LOC100911717 knockdown reduced the infarcted heart area and improved post-MI cardiac function.