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To purify and characterize the specific antigen recognized by monoclonal antibody 703D4, an early detection biomarker for lung cancer.

Purification and Characterization of a Protein That Permits Early Detection of Lung Cancer

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To purify and characterize the specific antigen recognized by monoclonal antibody 703D4, an early detection biomarker for lung cancer.
Purified the 703D4 antigen using anion exchange chromatography, preparative isoelectric focusing, and reverse-phase high performance liquid chromatography (HPLC), followed by Western blot detection.
Performed CNBr peptide digestion and sequence analysis on the purified protein to overcome an NH2-terminal block.
Conducted Northern blot analysis of RNA in primary normal bronchial epithelial cells, SV40-transformed cells, and tumor cell lines to evaluate expression regulation.
Achieved a 25,000- to 50,000-fold purification (>95% purity) and identified the primary immunoreactive antigen as heterogeneous nuclear ribonucleoprotein-A2 (hnRNP-A2), with its splice variant hnRNP-B1 co-purifying as a minor component.
Demonstrated low hnRNP-A2/B1 expression in normal bronchial epithelial cells but markedly elevated expression in lung cancer cells.
Observed proliferation-dependent regulation of hnRNP-A2/B1 expression in normal primary epithelial cells that was lost in SV40-transformed cells and tumor lines.

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Biochemical study reveals hnRNP-A2/B1 overexpression in lung cancer cells, indicating its role as an early marker of malignant transformation.

Zhou et al. (1996) studied this question.

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Biochemical study reveals hnRNP-A2/B1 overexpression in lung cancer cells, indicating its role as an early marker of malignant transformation.