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Gene expression profiling of basal and luminal epithelial cells from young adult and old mouse prostates

ABSTRACT: We set out to determine if prostate epithelial cell-types exhibited age-related differences in their gene expression profiles. We used fluorescence activated cell sorting to isolate basal and luminal cells from dissociated preparations of prostate tissue taken from young adult (3 months) and old (24 months of age) mice. RNA was extracted from sorted cells to evaluate differences in gene expression. We found significant enrichment for progenitor genes in old luminal cells including an immune/inflammatory profile that overlapped with a previously identified CD38-lo human prostate luminal progenitor signature. This study demonstrates a luminal progenitor signature in old mouse prostate.

ORGANISM(S): Mus musculus

PROVIDER: GSE122367 | GEO | 2019/08/01

REPOSITORIES: GEO

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Project description:15-Lipoxygenase 2 (15-LOX2), a human-specific lipid-peroxidizing enzyme, is mainly expressed in luminal compartment of the normal prostate and often decreased or lost in prostate cancer (PCa). Previous studies from our lab implicate 15-LOX2 as a functional tumor suppressor. To better understand the biological role of 15-LOX2 in vivo, we established prostate-specific 15-LOX2 transgenic mice using the ARR2PB promoter. Unexpectedly, 15-LOX2 expression resulted in age-dependent prostatic hyperplasia. Interestingly, transgenic expression of 15-LOX2sv-b, a splice variant that lacks the arachidonic acid metabolizing activity, also induced hyperplasia and enlargement of the prostate. Prostatic hyperplasia induced by both 15-LOX2 and 15-LOX2sv-b was associated with an increase in proliferative (i..e., Ki67+) and luminal cells but 15-LOX2-induced hyperplasia was also accompanied by a prominent increase in basal cells. Microarray analysis revealed distinct gene expression profiles that could help explain the prostate phenotypes. Strikingly, 15-LOX2 (but not 15-LOX2sv-b) transgenic prostate showed up-regulation of several well-known stem/progenitor cell molecules including Sca-1, Trop2, p63 and Psca. Prostatic hyperplasia caused by both 15-LOX2 and 15-LOX2sv-b did not progress to PCa over >5 years of observations. Mechanistically, hyperplastic prostate lobes (especially those of the 15-LOX2 mice) showed a dramatic increase in senescent cells revealed by increased SA-ßgal, HP1, and p27Kip1 staining. Collectively, our results suggest that 15-LOX2 expression in mouse prostate leads to hyperplasia that activates the senescence checkpoint, which may in turn function as a barrier to tumor development. RNA was isolated from combined prostatic lobes of 6 mice (to reduce inter-animal variation) from ~2.5 month old (young; y) 15-LOX2 (line fl26), 15-LOX2sv-b (line svb9), wild type (wt) and ~15 month old (old; o) wt mice and hybridized onto Agilent's whole mouse genome oligoarrays arrays (G4122A) in fl26y(vs)wty, svb9y(vs)wty and wto(vs)wty combinations. The hybridizations were carried out in duplicates using an independent set of samples (biological replicates).

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Gene expression profiling of basal and luminal epithelial cells from young adult and old mouse prostates

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