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Successful Islet Cell Transplant in Mice With Type 1 Diabetes

Researchers have determined a way to pre-screen cancer patients to see if they are suitable candidates for proteasome inhibitors, a promising class of anti-cancer drugs// . They propose to test for p53, a well-known tumor-suppressor protein that is broken down by cellular machinery called proteasomes.

In cancer patients whose tumors do not produce p53, proteasome inhibitors might be ineffective. This patient group could be spared unnecessary treatment with possible harmful side effects. On the other hand, proteasome inhibitors are highly effective against lymphomas that do have the ability to produce p53.

“Proteasomes resemble paper shredders – they break down proteins such as p53 into smaller pieces,” says senior author Andrei Thomas-Tikhonenko, PhD, Associate Professor of Pathology. “A proteosome inhibitor effectively jams the shredder so that p53 is not immediately broken down.”

In this study, the research team used a mutant strain of mice in which p53 activity can be switched on and off. “In principle, tumors in these mice could be obliterated by turning p53 back on,” says Thomas-Tikhonenko. “The problem was that a protein called MDM2 sent p53 into the teeth of the proteasome shredder.” The proteasome inhibitor bortezomib (Velcade?) causes this jamming process and restores p53 function. However, if p53 was inactivated in the mice, bortezomib treatment failed to kill tumors. Similar effects were seen with cell lines derived from human Burkitt’s lymphomas. When implanted into mice, these lymphoma cells were highly sensitive to the proteasome inhibitor, but as soon as p53 was removed, the inhibitor had no effect.

“These findings have important implications for clinical practice,” Thomas-Tikhonenko adds. “Bortezomib is approved by the Food and Drug Administration for the treatment of multiple myeloma, another cancer of lymphoid cells. Yet, only a fraction of multiple myeloma patients respond to the drug.”


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