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Cathepsin B Expression in Human Tumors

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Intracellular Protein Catabolism

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 389))

Summary

Cathepsin B has been linked to tumor progression through observations that its activity, secretion or membrane association are increased. The most malignant tumors, and specifically the cells at the invasive edge of those tumors, express the highest activity. Cathepsin B may facilitate invasion directly by dissolving extracellular matrix barriers like the basement membrane, or indirectly by activating other proteases capable of digesting the extracellular matrix. Cathepsin B also might play a role in tumor growth and angiogenesis. Cathepsin B activity is the result of several levels of regulation: transcription, post-transcrip-tional processing, translation and glycosylation, maturation and trafficking, and inhibition. The majority of reports on cathepsin B expression in tumors have focused on measurements of activity or protein staining. In some tumors, e.g., gliomas, a correlation between the amounts of cathepsin B mRNA, protein and activity and tumor progression has been established. Regulation of cathepsin B at the transcriptional and post-transcriptional levels is still poorly understood. Although the putative promoter regions have characteristics of housekeeping-type promoters, cathepsin B mRNA expression varies depending on the cell type and state of differentiation. We have evidence that more than one promoter could direct expression of human cathepsin B. Multiple transcript species have been detected, resulting from alternative splicing in the 5′- and 3′-untranslated regions, and possibly the use of alternative promoter regions. The existence of transcript variants indicates a potential for post-transcriptional control of expression. In support of this, ras-transformation of MCF-10A human breast epithelial cells results in an increase in protein levels without a concomitant increase in mRNA levels. Cathepsin B mRNA species with distinct 5′-or 3′-untranslated regions may differ in their stability and translatability. Variations in the coding region may also alter cathepsin B properties. We and Frankfater’s group have observed transcript species that would encode a truncated protein, lacking the prepeptide and about half of the propeptide. This truncated protein, if synthesized in cells, would be expected to be cytosolic; therefore its function is unclear. Once the several mechanisms of regulation of cathepsin B expression and activity are better understood, they could provide us with new strategies to specifically reduce cathepsin B activity in tumors.

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Berquin, I.M., Sloane, B.F. (1996). Cathepsin B Expression in Human Tumors. In: Suzuki, K., Bond, J.S. (eds) Intracellular Protein Catabolism. Advances in Experimental Medicine and Biology, vol 389. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0335-0_35

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  • DOI: https://doi.org/10.1007/978-1-4613-0335-0_35

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