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Liu, C X; Musco, S; Lisitsina, N M; Forgacs, E; Minna, J D; Lisitsyn, N A
Cancer research (Chicago, Ill.), 2000-Apr-01, 20000401, Letnik: 60, Številka: 7Journal Article
A variety of studies suggest that allelic losses at chromosome 2q are associated with aggressive behavior of various forms of human neoplasia. Using a probe to detect homozygous deletions on chromosome 2q21.2 in kidney and bladder cancer cell lines, we identified a new candidate tumor suppressor gene, lipoprotein receptor-related protein-deleted in tumors (LRP-DIT). The predicted LRP-DIT product of 4599 amino acids has extensive homology to a gigantic receptor, LRP1, which mediates endocytosis of multiple proteins from the cell surface. Homozygous deletions in LRP-DIT were detected in 17% (4 of 23) of non-small cell lung cancer (NSCLC) cell lines. The expression of only abnormal transcripts missing portions of the LRP-DIT sequence was demonstrated in an additional 30% (11 of 36) of NSCLC lines. Finally, a missense mutation at codon 3157 was detected in one of four NSCLC lines tested for the large open reading frame. In contrast, no LRP-DIT alterations were identified in a major fraction of SCLC cell lines, indicating that this gene is preferentially inactivated in one histological type of lung cancer. Our data suggest that inactivation of LRP-DIT occurs in at least 40% of NSCLC lines and thus may play an important role in tumorigenesis of NSCLCs.
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