Abstract
The elucidation of detailed new signaling pathways in normal cells and how their perturbation contributes to the development of the malignant phenotype has created innumerable venues for the development of novel drugs that can affect these targets in therapeutically meaningful ways. For example, our understanding of the complex biology underlying the ubiquitin-proteasome pathway in normal cells has recently led to the identification of specific agents capable of affecting this biology. Intuitively, one would not presume that inhibiting such a ubiquitous and essential biologic process, such as the ubiquitin-proteasome pathway, would lead to a new therapeutic strategy in cancer patients, although empirical evidence has suggested otherwise. The proteasome is a complex structure of many proteins, some of which are specific proteases, that play a critical role in regulating the balance of intracellular protein. Bortezomib, formerly known as PS-341, is a very potent and selective inhibitor of the chymotryptic-like enzymatic function residing in the 26S proteasome. Inhibition of this particular enzymatic activity has now been associated with an enormous panoply of different biologic effects, including everything from the regulation of...Continue Reading
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