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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, OBJECTIVE, RESULTS. Meshes: Adenocarcinoma, Adenocarcinoma, Bronchiolo-Alveolar, Adult, Aged, Aged, 80 and over, Female, Gene Expression Profiling, Humans, Lung Neoplasms, Male, Middle Aged, Neoplasm Invasiveness, Oligonucleotide Array Sequence Analysis, Protein-Serine-Threonine Kinases, Receptor, Transforming Growth Factor-beta Type II, Receptors, Transforming Growth Factor beta.
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Does lung adenocarcinoma global profiling identify type II transforming growth factor-beta receptor as a repressor of invasiveness? Context: Lung adenocarcinoma histology and clinical outcome are heterogeneous and associated with tumor invasiveness. We hypothesized that invasiveness is associated with a distinct molecular signature and that genes differentially expressed in tumor or adjacent stroma will identify cell surface signal transduction and matrix remodeling pathways associated with the acquisition of invasiveness in lung adenocarcinoma. Microarray analysis of microdissected noninvasive bronchioloalveolar carcinoma (BAC) and invasive adenocarcinoma and adenocarcinoma-mixed type with BAC features identified transcriptional profiles of lung adenocarcinoma invasiveness. Among the signature set that was lower in adenocarcinoma-mixed compared with BAC was the type II transforming growth factor beta (TGF-beta) receptor, suggesting downregulation of TGFbetaRII is an early event in lung adenocarcinoma metastasis. Immunostaining in independently acquired specimens demonstrated a correlation between TbetaRII expression and length of tumor invasion. Repression of TGFbetaRII in lung cancer cells increased tumor cell invasiveness and activated p38 mitogen-activated protein kinases. Microarray analysis of invasive cells identified potential downstream mediators of TGFbetaRII with differential expression in lung adenocarcinomas.
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The repression of type II TGF-beta receptor may act as a significant determinant of lung adenocarcinoma invasiveness, an early step in tumor progression toward metastasis. Final Decision: yes