p96, a MAPK-related protein, is consistently downregulated during mouse mammary carcinogenesis
Differential display PCR [DD-PCR] was applied to identify mRNAs differentially expressed between two consecutive stages of an in vivo model of mouse mammary carcinogenesis. The extended life 12 [EL12] and transformed mammary 12 [TM12] outgrowths differ in morphology, ovarian hormone dependence, and...
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Published in | Oncogene Vol. 17; no. 9; pp. 1173 - 1178 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Basingstoke
Nature Publishing
03.09.1998
Nature Publishing Group |
Subjects | |
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Abstract | Differential display PCR [DD-PCR] was applied to identify mRNAs differentially expressed between two consecutive stages of an in vivo model of mouse mammary carcinogenesis. The extended life 12 [EL12] and transformed mammary 12 [TM12] outgrowths differ in morphology, ovarian hormone dependence, and tumorigenicity, yet the TM12 outgrowth arose spontaneously from the EL12 outgrowth. A fragment of the mouse p96 gene was identified using DD-PCR. The differential expression of p96 was confirmed using RNase protection assays. Examination of the RNA expression patterns of the p96 isoforms during normal mammary gland development showed high levels in the involuting mammary gland and in preneoplastic hyperplasias. In contrast, p96 isoform mRNA levels were consistently decreased in mammary tumors derived from the in vivo hyperplasias. Examination of p96 protein levels revealed a decrease in p96 protein in a number of mammary tumors as compared to their hyperplastic precursors further supporting the observations that p96 gene expression is consistently downregulated in mammary tumors. The functional activity of p96 protein has not been resolved, however the observation that p96 gene expression is downregulated in two different tumor systems (human ovarian tumors and mouse mammary tumors) warrants more extensive investigation on its role in normal and neoplastic cell growth. |
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AbstractList | Differential display PCR [DD-PCR] was applied to identify mRNAs differentially expressed between two consecutive stages of an in vivo model of mouse mammary carcinogenesis. The extended life 12 [EL12] and transformed mammary 12 [TM12] outgrowths differ in morphology, ovarian hormone dependence, and tumorigenicity, yet the TM12 outgrowth arose spontaneously from the EL12 outgrowth. A fragment of the mouse p96 gene was identified using DD-PCR. The differential expression of p96 was confirmed using RNase protection assays. Examination of the RNA expression patterns of the p96 isoforms during normal mammary gland development showed high levels in the involuting mammary gland and in preneoplastic hyperplasias. In contrast, p96 isoform mRNA levels were consistently decreased in mammary tumors derived from the in vivo hyperplasias. Examination of p96 protein levels revealed a decrease in p96 protein in a number of mammary tumors as compared to their hyperplastic precursors further supporting the observations that p96 gene expression is consistently downregulated in mammary tumors. The functional activity of p96 protein has not been resolved, however the observation that p96 gene expression is downregulated in two different tumor systems (human ovarian tumors and mouse mammary tumors) warrants more extensive investigation on its role in normal and neoplastic cell growth. |
Author | MEDINA, D SCHWAHN, D. J |
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Keywords | Enzyme Transferases Hyperplasia Rodentia Gene expression Cell transformation Carcinogenesis Mammary gland diseases Vertebrata Mammalia Gene Mouse Protein kinase Tumor Mammary gland |
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SubjectTerms | Adaptor Proteins, Signal Transducing Adaptor Proteins, Vesicular Transport Animals Biological and medical sciences Breast - metabolism Breast cancer Calcium-Calmodulin-Dependent Protein Kinases - genetics Carcinogenesis Cell physiology Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes Cell Transformation, Neoplastic - genetics Differential display DNA, Complementary - analysis DNA, Complementary - genetics Female Fundamental and applied biological sciences. Psychology Gene expression Gene Expression Regulation, Neoplastic Genes, Tumor Suppressor Isoforms Mammary gland Mammary Neoplasms, Experimental - genetics MAP kinase Mice Mice, Inbred BALB C Molecular and cellular biology Ovaries Phosphoproteins - genetics Phosphoproteins - metabolism Pregnancy Proteins Ribonuclease RNA, Messenger - analysis RNA, Messenger - genetics Tumor Cells, Cultured - cytology Tumor Cells, Cultured - metabolism Tumor Suppressor Proteins Tumorigenicity Tumors |
Title | p96, a MAPK-related protein, is consistently downregulated during mouse mammary carcinogenesis |
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