In a study appearing online this week in the Proceedings of the National Academy of Sciences, the UT Southwestern scientists detail how the toxin blocks uninhibited reproduction of cultured human cancer cells while leaving healthy cells unaffected.
An accompanying study in PNAS shows that, in pre-clinical trials, a synthetic form of the toxin reduced human tumors implanted in mice without the harmful side effects seen using other cancer drugs. "Diazonamide is a special molecule – it's teaching us more than we imagined," said Dr. Patrick Harran, professor of biochemistry and a senior author on both studies.
"This is a truly exciting result," said Dr. John Schwab, a program officer at the National Insti tutes of Health's National Institute of General Medical Sciences, which partly funded the work. "Not only has this UT Southwestern team identified a potent anti-cancer drug, but its unique mode of action avoids the kinds of side effects that make cancer chemotherapy so difficult. It's a great example of how NIH support for fundamental chemical research can benefit the American health-care consumer."
The animal, Diazona angulata, is a sea squirt a few inches wide that lives in colonies anchored to rocks. It was discovered offshore of the Philippines in 1990 as scientists were looking for species that might lead to useful drugs. From a few specimens, scientists extracted a tiny amount of a toxin, diazonamide A, which the animal probably uses to repel predators.
The toxin proved to kill cancer cells in culture, but so little of its natural form was available that a race soon began to synthesize it in the laboratory.
A chemical structure for diazonamide A was published in 1991, but in 2001, Dr. Harran's group showed that initial report to be incorrect, and uncovered the correct structure. In the first of the two new studies, Dr. Harran and his co-workers synthesized several variants of diazonamide A in order to pin down how it prevents cancer cells from dividing.
Normal cell division involves a structure called the mitotic spindle, which pulls apart the chromosomes before the cell splits. The spindle is primarily made out of a substance called tubulin. Some anti-cancer drugs attack tubulin, but they have serious side effects, such as nerve damage and depletion of bone marrow and white blood cells.
The UT Southwestern researchers found that while diazonamide A blocked cell division, it seemed not to bind directly to tubulin. Instead, Dr. Xiaodong Wang, professor of biochemistry, and Dr. Gelin Wang, instructor of biochemistry, found that the toxin interacted with an enzyme called OAT, which was known to be involved in cellular metabolism but had no previously known role in cell division.
Interestingly, diazonamide did not block OAT's enzyme activity, the researchers said. Rather, it uncovered a second function for the protein in cell division.
"The finding that OAT is the cellular target of diazonamide is surprising for two reasons: First, there is no previous report that a mitochondrial enzyme like OAT can play a direct role in mitosis; second, OAT seems dispensable for normal cell division occurring in mice and men but is required for the division of cancer cells. This may explain the cancer specificity of diazonamide," said Dr. Wang, who is also a Howard Hughes Medical Institute investigator.
Dr. Noelle Williams, assistant professor of biochemistry and internal medicine, led the second phase of the research, which tested the effect of a variant of diazonamide A, called AB-5, in mice with tumors.
AB-5 has a structure nearly identical to diazonamide A and is indistinguishable in its biological action, but is easier to synthesize in the lab.
The researchers tested AB-5's effectiveness against cancer by implanting human tumor cells under the skin of m ice and treating them with either paclitaxel (Taxol) or vinblastine – both approved drugs currently used – or AB-5. The trial used tumor cells from human prostate, breast and colon cancers.
While all three drugs reduced tumors in the mice, the known drugs caused significant weight loss and loss of white blood cells while AB-5 caused neither side effect. "That the diazonamide toxin blocks mitosis selectively in cancer cells is almost too desirable an outcome to be true," said Dr. Steven McKnight, chairman of biochemistry and senior author of the second study. "As with any other unanticipated scientific discovery, the validity of these observations will be held to appropriately diligent scrutiny."
Aline McKenzie | EurekAlert!
Zap! Graphene is bad news for bacteria
23.05.2017 | Rice University
Discovery of an alga's 'dictionary of genes' could lead to advances in biofuels, medicine
23.05.2017 | University of California - Los Angeles
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...
23.05.2017 | Event News
22.05.2017 | Event News
17.05.2017 | Event News
23.05.2017 | Physics and Astronomy
23.05.2017 | Life Sciences
23.05.2017 | Medical Engineering