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Runx3/Pebp2alphaC null mouse gastric mucosa exhibits hyperplasias due to stimulated proliferation and suppressed apoptosis in epithelial cells, and the cells are resistant to growth-inhibitory and apoptosis-inducing action of TGF-beta, indicating that Runx3 is a major growth regulator of gastric epithelial cells. Between 45% and 60% of human gastric cancer(More)
cDNA clones for 4 rat protein phosphatase 1 (PP1) catalytic subunit isotypes, PP1 alpha, PP1 gamma 1, PP1 gamma 2 and PP1 delta, were isolated (K. Sasaki et al., Jpn. J. Cancer Res. 81, 1272-1280, 1990). Antibodies were raised to determine the physiological functions of 4 isotypes. Among these isotypes, the PP1 gamma 2 protein was detected specifically in(More)
We examined 28 cases of surgically resected gastric cancer, excluding the diffuse type, for loss of heterozygosity (LOH) on 12 chromosomal arms using polymorphic DNA markers. LOH on chromosome 18q was detected in 61% (14 of 23) of the cases by the probes OLVIIA8, OLVIIE10, p15-65, SAM 1.1, and OS-4, and a putative common region showing LOH included the(More)
Calyculin A, isolated from a marine sponge, has a novel spiro ketal skeleton. Structurally unrelated to okadaic acid, calyculin A bound to the okadaic acid receptors in particulate and soluble fractions of mouse skin. The biochemical and tumor-promoting activities of calyculin A were studied with those of okadaic acid. Calyculin A inhibited the activity of(More)
Prostate tissues obtained from rats given a food-derived carcinogen, 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP), at a dose of 400 ppm in the diet for 52 weeks were histopathologically evaluated and found to contain prostate carcinomas limited to the ventral lobe in 18 of 27 cases. Atypical hyperplasias were also detected in the ventral and(More)
Bone morphogenetic proteins (BMPs) belong to the transforming growth factor-beta (TGF-beta) family and have been identified as factors that stimulate bone formation in vivo. They turned out to be multifunctional molecules regulating the growth, differentiation, and apoptosis in various target cells. Some BMPs and their receptors (BMPRs) are expressed on(More)
Clinicopathological evidence is accumulating that a superficial-type (flat) colorectal tumor is a distinct neoplastic entity. To clarify the genetic characteristics of this tumor, we investigated the K-ras gene mutations and morphological features of 43 tumors of this type. A mutation of the K-ras codon 12 was detected in only 5 (16%) of 31 adenomas and 2(More)
2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) induces colon tumors in male, but not female, F344 rats. We investigated the mechanisms leading to this difference by measuring the level of PhIP-DNA adducts, the enhancement of cell proliferation and aberrant crypt focus (ACF) formation in colon mucosa. PhIP was administered in the diet at a level of(More)
A cup of coffee contains mutagens which produce about 5 X 10(4)-10(5) revertants of Salmonella typhimurium TA 100 without S9 mix. One of the mutagens was identified to be methylglyoxal. Methylglyoxal was present in various beverages such as black tea, whisky, and brandy. Methylglyoxal itself induced tumors in rats when administered by subcutaneous(More)