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Published on: September 13, 2019
Src kinase induces tumor formation in the c-SRC C57BL/6 mouse
Christina Leah B Kline1, Rosalind Jackson, Robert Engelman
1Penn State Cancer Institute H072, Penn State College of Medicine, 500 University Drive, PO 850, Hershey, PA 17033, USA.
Src kinase, elevated in cancers like colon and breast, may drive tumor development. This study used transgenic mice to show that high Src expression alone can cause liver tumors, suggesting its role in carcinogenesis.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Src kinase is implicated in various cancers, with elevated levels in colorectal cancer and liver metastases.
- Increased Src protein is observed early in colon cancer (adenomatous polyps), but its direct role in carcinogenesis is unproven.
Purpose of the Study:
- To investigate the role of Src kinase in carcinogenesis using a zinc-inducible c-SRC transgenic mouse model.
- To determine the combined effect of Src oncogene expression and p21 tumor suppressor gene inactivation on tumor development.
Main Methods:
- Developed a c-SRC transgenic mouse model in the C57BL/6 strain with zinc-inducible human c-SRC gene expression.
- Assessed tumor development in liver, GI tract, and other organs after 20 months without additional carcinogens.
- Crossed c-SRC transgenic mice with p21 nullizygous mice to study combined genetic effects.
Main Results:
- Transgenic mice exhibited increased Src protein in various tissues.
- 15% of c-SRC transgenic mice developed liver tumors, while no tumors were observed in wild-type mice.
- Combining c-SRC transgene with p21 deficiency increased tumor formation threefold and metastasis sixfold.
Conclusions:
- Src kinase activity may play a direct role in initiating carcinogenesis.
- Elevated Src expression can lead to spontaneous tumor development.
- The interplay between Src oncogene and p21 tumor suppressor influences tumor progression and metastasis.
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