LPAR3 and myocardial infarction: Compared with LPA3+/+ infarcted mice, there was a tendency for a reduced heart weight/body weight ratio (Figure 5A), a notable decrease in ANP mRNA levels (Figure 5B), and a significant decrease in cardiomyocyte cross-sectional area (Figures 5C,D) in LPA3-/- mice post-MI.