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Cancer Drug Could Be Prize Catch From Sea
SALT LAKE CITY (Reuters Health) - Producing large quantities of
a promising cancer drug candidate--first discovered 20 years
ago in a marine organism--could one day be almost as simple as
making beer if new research pans out.
There are currently more than a dozen compounds from ocean creatures
in clinical trials as cancer drugs or antibiotics. But even if
they prove effective, several obstacles exist to producing such
drugs on an industrial scale. For one, harvesting the organisms,
which may be rare, can damage the environment. And the potential
drugs are often found in very low levels in the organisms, making
gathering them prohibitively expensive.
Dr. Margo Haygood, an associate professor of marine biology at
Scripps Institute of Oceanography in La Jolla, California, and
her colleagues are attempting to overcome such problems with
bryostatins. These chemicals are found in Bugula neritina, invertebrates
that live in colonies in temperate oceans around the world. Researchers
believe that B. neritina "packages" its larvae--tiny clusters
of cells that act as seeds for new colonies--with a dose of bryostatins
to prevent predatory fish from eating them.
Bryostatin 1, which Haygood calls the "flagship" marine drug product,
is currently in clinical trials for several types of cancer.
But producing the few grams of the chemical needed for the trials
required several tons of B. neritina, the researcher noted.
Haygood's team may have found a way around this problem.
They
are assembling evidence that the organism itself doesn't produce
bryostatins. Instead, a bacterium living inside Bugula larvae--which
they've dubbed Candidatus Endobugula sertula--may be the source.
[05/22/2002; Reuters Health]
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