[Molecular cloning of a novel human lung cancer-associated antigen cDNA].
OBJECTIVE
To clone the gene of human lung cancer-associated antigen.


METHODS
The human lung squamous carcinoma cell line L-78 cDNA expression library was constructed with lambda gt 11 Sfi-Not directional cloning vector and screened with the anti-human lung cancer McAb ALT-04. The cDNA clone named hlc-14 was sequenced and further studied. NIH3T3 cells were transfected with the recombinant pXJ41-hlc14 plasmid, and the expression of hlc-14 cDNA was detected and characterized immunohistochemically. Soft agar colony formation assay of the transfectants was performed.


RESULTS
A human lung cancer lambda gt 11 cDNA library of 1.4 x 10(6) pfu/ml was constructed. Six cDNA clones were isolated following 4 rounds of immunoscreening. The largest cDNA clone hlc-14 contained 954 bp with no homology to any known gene when screened through GenBank. In the NIH3T3 cells transfectant of hlc-14 cDNA, the expression of the lung cancer-associated antigen was demonstrated. The ability of colony formation of the transfectant in the soft agar was enhanced.


CONCLUSIONS
The hlc-14 clone is a novel human lung cancer-associated antigen cDNA. It provides clues for the study of carcinogenesis mechanism of lung cancer and a novel target gene for the gene therapy of lung cancer.
Department of Biochemistry & Molecular Biology, China-Japan Friendship Institute of Clinical Medical Sciences, Beijing.
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Cao
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Fan
D000595:Amino Acid Sequence; D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics*; D001483:Base Sequence; D002294:Carcinoma, Squamous Cell / Q000276:immunology*; D003001:Cloning, Molecular; D004273:DNA, Neoplasm / Q000235:genetics*; D015723:Gene Library; D006801:Humans; D008175:Lung Neoplasms / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA; D014407:Tumor Cells, Cultured
D000951:Antigens, Neoplasm; D004273:DNA, Neoplasm