A. Hematoxylin and eosin (H&E) staining of small intestine and colon isolated from eight month-old WT and Mdm2m/m mice. Scale bar = 200μm.
B. Ki-67 immunohistochemical (IHC) staining of proliferating cells in small intestine and colon isolated from eight month-old mice. Proliferating cells are located at the bottom of crypts in both the small intestine and colon. Scale bar = 200μm.
C. IHC staining of cleaved caspase-3 (CC-3) to probe for apoptotic cells (indicated by arrows) in small intestine and colon tissue isolated from eight month-old mice. Scale bar = 100μm.
D. mRNA expression of lgr5, lyz1, muc2 and chga in small intestine or colon from eight month-old WT or Mdm2m/m mice was analyzed by qRT-PCR. n=3 for each genotype. Error bars, ±SEM.
E. Small intestines were isolated from 15 week-old mice, and polyp numbers per mouse were counted under a dissection microscope (n=12 for each genotype).
F. The average cross sectional areas (CSA) of H&E stained small intestinal adenomas were determined quantitatively using ImageJ.
G. Kaplan-Meier survival curves for ApcMin/+; Mdm2+/+ (n=40) and ApcMin/+; Mdm2m/m (n=18) mice are shown. The median survival times did not differ significantly between the two genotypes.