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Transforming activity of the lymphotoxin-beta receptor revealed by expression screening
Shin-ichiro Fujiwara1, Yoshihiro Yamashita, Young Lim Choi
1Division of Functional Genomics, Jichi Medical School, Tochigi 329-0498, Japan.
Abstract:
Pancreatic ductal carcinoma (PDC) remains one of the most intractable human malignancies. To obtain insight into the molecular pathogenesis of PDC, we constructed a retroviral cDNA expression library with total RNA isolated from the PDC cell line MiaPaCa-2. Screening of this library with the use of a focus formation assay with NIH 3T3 mouse fibroblasts resulted in the identification of 13 independent genes with transforming activity. One of the cDNAs thus identified encodes an NH(2)-terminally truncated form of the lymphotoxin-beta receptor (LTBR). The transforming activity of this short-type LTBR in 3T3 cells was confirmed by both an in vitro assay of cell growth in soft agar and an in vivo assay of tumorigenicity in nude mice. The full-length (wild-type) LTBR protein was also found to manifest similar transforming activity. These observations suggest that LTBR, which belongs to the tumor necrosis factor receptor superfamily of proteins, may contribute to human carcinogenesis.
Insights
Researchers identified the lymphotoxin-beta receptor (LTBR) as a gene with transforming activity in pancreatic ductal carcinoma (PDC). This finding suggests LTBR may play a role in human cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Pancreatic ductal carcinoma (PDC) is a highly aggressive and difficult-to-treat human malignancy.
- Understanding the molecular drivers of PDC is crucial for developing effective therapies.
Purpose of the Study:
- To identify genes involved in the molecular pathogenesis of pancreatic ductal carcinoma (PDC).
- To investigate the transforming activity of identified genes in cellular and animal models.
Main Methods:
- Construction of a retroviral cDNA expression library from the MiaPaCa-2 PDC cell line.
- Screening the library using NIH 3T3 mouse fibroblasts and a focus formation assay.
- Confirmation of transforming activity via in vitro soft agar growth and in vivo tumorigenicity assays in nude mice.
Main Results:
- Identification of 13 independent genes with transforming activity.
- One identified gene encoded a truncated form of the lymphotoxin-beta receptor (LTBR).
- Both truncated and full-length wild-type LTBR proteins demonstrated transforming activity in NIH 3T3 cells.
Conclusions:
- The lymphotoxin-beta receptor (LTBR) exhibits transforming activity, suggesting its potential role in carcinogenesis.
- LTBR, a member of the tumor necrosis factor receptor superfamily, may contribute to the development of human cancers.
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