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New Cancer Therapy in Clinical Trial

The research, published in the July issue of the journal Cancer Cell, published by Cell Press, provides a pharmacological method for enhancing the potency and effectiveness of a tumor necrosis factor (TNF) death receptor ligand against a variety of human cancers.

A new study identifies a combination therapy that may sensitize human cancer cells to a promising treatment currently being used in clinical trials.

Potency and lack of toxicity to normal tissues make activation of TNF-a-related apoptosis-inducing ligand (TRAIL) death receptor signaling an attractive and exciting target for cancer therapy, and it is currently being tested in clinical trials.

However, most cancer cells have defects in their ability to die via a cell death pathway called apoptosis, and unfortunately, TRAIL therapy is not effective in cells that have certain defects in apoptotic pathways.

Dr. Wafik S. El-Deiry from the University of Pennsylvania School of Medicine and colleagues designed a series of studies to gain a better understanding of TRAIL-associated cell signaling pathways in cancer cells and to look for ways to pharmacologically optimize TRAIL therapy.

Dr. El-Deirys group had previously established that c-Myc is a key mediator of TRAIL-induced apoptosis and that cancer cells lacking c-Myc and a functional apoptotic pathway were resistant to TRAIL.

In the current study, the researchers demonstrated that expression of c-Myc in TRAIL-resistant human colon cancer cells sensitized the cells to TRAIL, even when the cells had intrinsic apoptotic defects. The researchers observed that TRAIL induced expression of two potent antiapoptotic molecules, Mcl-1 and cIAP2, and that c-Myc repressed both molecules.

The researchers also discovered that the multikinase inhibitor sorafenib prevented TRAIL-mediated induction of Mcl-1 and cIAP2, and although it had little effect on the killing of TRAIL-resistant c
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