cDNA microarray profiling of rat mammary gland carcinomas induced by 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine and 7,12-dimethylbenz[a]anthracene.
SMAD4--molecular gladiator of the TGF-beta signaling is trampled upon by mutational insufficiency in colorectal carcinoma of Kashmiri population: an analysis with relation to KRAS proto-oncogene.
We determined that carcinomas with high pY-STAT5a were more proliferative (MIB5 immunostaining) and had a higher expression of cyclin D1 and estrogen receptor alpha.
We determined that carcinomas with high pY-STAT5a were more proliferative (MIB5 immunostaining) and had a higher expression of cyclin D1 and estrogen receptor alpha.
The expression of ER alpha in carcinomas was associated with tumor grade, extent of nuclear pleomorphism and cellular proliferation as measured by proliferating cell nuclear antigen (PCNA) and phospho-Rb immunostaining (Spearman analysis, P < 0.05).
Major gene families implicated in malignancy by over-expression in carcinomas included the annexins (annexin A1 and A4) and Stat family of transcription factors (Stat3 and Stat5a).
Quantitative real-time polymerase chain reaction demonstrated that ER alpha, ER beta and PR were statistically elevated by 3-, 4- and 8-fold in carcinomas compared with normal mammary glands.
The elevated expression of the prolactin receptor in carcinomas concomitant with several components of the mitogenic prolactin signaling pathway implicated prolactin/prolactin receptor/Stat5a/cyclin D1 in rat mammary gland malignancy.
By immunohistochemical analysis, cyclin D1, Cdk4, and phospho-Rb nuclear protein expression was 5.7-, 3.9-, and 2.3-fold higher, respectively, in carcinomas than in normal mammary gland, whereas the expression of cyclin D2, cyclin D3, and Cdk6 was similar.
cDNA microarray profiling of rat mammary gland carcinomas induced by 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine and 7,12-dimethylbenz[a]anthracene.