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Differentially expressed mRNAs in androgen-independent but not androgen-dependent Shionogi carcinoma
T Takeuchi1, H Nishimatsu, T Ueki
1Department of Urology, Faculty of Medicine, University of Tokyo, Japan. TAKEUCHI-URO@h.u-tokyo.ac.jp
Unlabelled:
Recently, a new and highly effective method termed suppressive subtractive hybridization (SSH) has been introduced to clone differentially expressed mRNAs. Genes expressed in androgen-independent but not in androgen-dependent tumors, and vice versa, are obviously significant to delineate the mechanisms of androgen dependency/independency of these tumors. Mouse mammary cancer (Shionogi carcinoma-115) has been extensively used to analyze the mechanism of androgen-dependent cancer growth.
Methods:
We cloned androgen-independent and androgen-dependent Shionogi carcinoma-115 specific mRNAs by the SSH method. Cloned sequences were compared with known sequences using NCBI BLAST across the Internet. Two clones were positive for cDNA insert when androgen-independent cDNA was used as tester cDNA, while no clones were positive using the androgen-dependent tester cDNA. One of the former was mouse protein kinase C beta-II while the other was a new DNA sequence. Mouse protein kinase C beta-II mRNA and the new mRNA were shown to be differentially expressed by RT-PCR analysis in androgen-independent but not androgen-dependent Shionogi carcinoma. Two mRNA species differentially expressed in androgen-independent but not androgen-dependent Shionogi carcinoma were cloned by the SSH method. The significance of these mRNAs for androgen-dependency/independency of Shionogi carcinoma should be explained in future studies.
Insights
Suppressing subtractive hybridization (SSH) identified two novel mRNAs in androgen-independent mouse mammary tumors. These findings advance understanding of androgen dependency mechanisms in cancer.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Androgen dependency is crucial in certain cancers, like Shionogi carcinoma-115.
- Understanding genes driving androgen independence is key to cancer treatment.
Purpose of the Study:
- To identify specific messenger RNAs (mRNAs) that are differentially expressed in androgen-independent Shionogi carcinoma-115.
- To clone and characterize these differentially expressed mRNAs using suppressive subtractive hybridization (SSH).
Main Methods:
- Suppressing subtractive hybridization (SSH) was employed to isolate unique mRNAs from androgen-independent and androgen-dependent Shionogi carcinoma-115.
- Cloned sequences were analyzed using NCBI BLAST for identification.
- Reverse transcription polymerase chain reaction (RT-PCR) was used to validate differential gene expression.
Main Results:
- Two distinct mRNA species were successfully cloned from androgen-independent Shionogi carcinoma-115.
- One identified mRNA corresponded to mouse protein kinase C beta-II.
- The second identified mRNA represented a novel DNA sequence.
Conclusions:
- The study successfully identified two mRNAs, including mouse protein kinase C beta-II and a new sequence, that are specifically expressed in androgen-independent Shionogi carcinoma-115.
- These differentially expressed mRNAs are potential key players in the mechanisms of androgen dependency and independency in this cancer model.
- Further research is needed to elucidate the precise roles of these identified mRNAs in regulating androgen-dependent and independent cancer growth.