In a small-cell lung carcinoma (SCLC) tumor specimen as well as in 3 cell lines derived from SCLC biopsies obtained from the same patient at successive times during the clinical course, either the N-myc gene or the c-myc gene appeared to be amplified and expressed. The initial tumor specimen, a lymp
Oncogene expression in small-cell lung cancer cell lines and a testicular germ-cell tumor: Activation of the N-myc gene and decreased RB mRNA
✍ Scribed by Kalle Saksela; Tomi P. Mäkelä; Kari Alitalo
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- French
- Weight
- 894 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0020-7136
No coin nor oath required. For personal study only.
✦ Synopsis
N-myc and L-myc proto-oncogenes are expressed in many developing embryonic tissues. In contrast to expression of the closely related c-myc gene, N-myc and L-myc expression is very restricted in adult tissues. We show that small amounts of the L-myc RNA can be detected in normal adult testicular tissue. A high level of N-myc expression from a single-copy N-myc gene was found in a malignant tumor of the testis, histopathologically defined as a seminoma. This tumor also showed a decrease of mRNA from the retinoblastoma gene (RB), which is ubiquitously expressed in all normal tissues. Strikingly similar results on elevated expression of the L-myc and N-myc genes and a lack of RB mRNA have been reported in small-cell lung cancer cell lines, and are confirmed in our study.
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