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. 2018 Mar 9;9:196. doi: 10.3389/fphys.2018.00196

Figure 4.

Figure 4

Ghrelin treatment did not reduce immune cell infiltration and oxidative stress due to CPB in the rat heart, but not IL-6 protein expression. (A) H&E stained heart section of a sham rat showing normal features of cardiomyocytes, blood vessels and endomysium; a CPB saline group rat showing focal accumulations of infiltrating immune cells (black arrows) and degenerating myocardial cells; a ghrelin treated rat showing reduced focal accumulations and a marginal number of degenerating myocardial cells. (B) Immunofluorescence staining was used to access the levels of CD-68 macrophages (red stain, white arrows) positively-stained in cardiomyocytes. (C) Quantitative measurement of CD-68 positive cell number/field across 20 fields. (D) In situ TUNEL-assay was used to access the apoptotic cell number (green stain)/field across 20 fields in the myocardium. Nuclei were labeled with 4′, 6-diamidino-2-phenylindole (DAPI, blue). The merged image is presented in this figure. In all images scale bar is 50 μm. (E) Myocardial protein expression levels of NT, CD-68, IL-6, and caspase-3 was detected by Western blotting. β-actin was used as an internal control. (F–I) Bar graphs showing the densitometric analysis of the NT, CD-68, and IL-6 Western blots. The data shown are the mean ± SEM; N = 3 rats per group. Data were analyzed by a one-way ANOVA followed by Tukey's post hoc test. *p < 0.05 vs. sham group.