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Journal Article
Review
Challenge for 3D culture technology: Application in carcinogenesis studies with human airway epithelial cells.
Lung cancer is still one of the major intractable diseases and we urgently need more efficient preventive and curative measures. Recent molecular studies have provided strong evidence that allows us to believe that classically well-known early airway lesions such as hyperplasia, metaplasia, dysplasia and carcinoma in situ are really precancerous lesions progressing toward cancer but not necessarily transient and reversible alteration. This suggests that adequate early control of the precancerous lesions may lead to improved prevention of lung cancer. This knowledge is encouraging in view of the imminent necessity for additional experimental systems to investigate the causal mechanisms of cancers directly in human cells and tissues. There are many questions with regard to various precancerous lesions of the airways. For example, should cells, before reaching a stage of invasive carcinoma, undergo all precancerous stages such as hyperplasia or metaplasia and dysplasia, or is there any shortcut to bypass one or more of the precancerous stages? For the study of such questions, the emerging 3-dimensional (3D) cell culture technology appears to provide an effective and valuable tool. Though a great challenge, it is expected that this in vitro technology will be rapidly and reliably improved to enable the cultures to be maintained in an in vivo-mimicking state of differentiation for much longer than a period of at best a few months, as is currently the case. With the help of a "causes recombination-Lox" (Cre-lox) technology, it has been possible to trace cells giving rise to specific lung tumor types. In this short review we have attempted to assess the future role of 3D technology in the study of lung carcinogenesis.
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