An algae-based pain medication that could improve the care of patients undergoing surgery is now closer to reality
thanks to a collaboration between Cawthron Institute and medical researchers at Boston Children’s Hospital (a Harvard
Medical School teaching hospital) and Chilean biotech company Proteus.
Cawthron Institute has announced they have developed a reliable and commercially scalable method for producing
neosaxitoxin, a potent toxin from the paralytic shellfish toxin family, that can be combined with existing local
anaesthetics for use as a local anaesthetic during and after surgery in post-operative patients.
All the local anaesthetics currently on the market are of two chemical classes, amino-amides and amino-esters, and they
have changed very little over the past 50 years. Neosaxitoxin is the first member of the class of molecules called site
1 sodium channel blockers to be used in human clinical trials as a local anaesthetic.
Dr Johan Svenson, Cawthron Institute’s Science Leader for Algae and Bioactives research, says this is a globally
significant scientific innovation that demonstrates Cawthron Institute’s world leading expertise in algal biotechnology
and bioactive compound extraction and purification.
“Cawthron Institute has decades of experience producing compounds from algae for a range of scientific purposes. When we
began our collaboration with researchers at Boston Children’s Hospital on the development of a neosaxitoxin-based pain
medication, we were confident we could develop a reliable method of production of a high-purity product, even though no
other research institute before us had achieved this feat,” Dr Svenson says.
“Producing commercial quantities of algae is a complex business – figuring out how to grow it is challenging enough, but
then you still need the capability to extract and purify the bioactive compound, and in the case of neosaxitoxin, there
was a chemical conversion step that we have developed and patented to achieve the level of purity required.”
Dr Charles Berde, co-founder of the Pain Treatment Center in the Department of Anesthesiology, Critical Care and Pain Medicine at Boston Children’s Hospital and Professor of Anaesthesia at Harvard Medical School, has been co-leading the development of a neosaxitoxin-based
local anaesthetic for over two decades alongside his colleague Dr Daniel Kohane. Dr. Kohane is Director of the
Laboratory for Biomaterials and Drug Delivery and Vice Chair for Research in the Department of Anesthesiology, Critical
Care and Pain Medicine at Boston Children's Hospital and Professor of Anaesthesia at Harvard Medical School.
“Our motivation to develop this drug was to provide more effective pain relief for both children and adults following
surgery. Opioid analgesics produce side-effects and can be addictive, so there is a great interest in developing better
non-opioid approaches to pain relief,” Dr. Berde says.
Phase 1 clinical trials have been completed in the U.S. and Europe and showed very good safety and effectiveness in
achieving more prolonged duration of local anaesthesia for infiltration and nerve blocks compared to the traditional
local anesthetic, bupivacaine.
“The next steps are to take this drug through Phase 2 clinical trials, and although there is always uncertainty during
the FDA approval process, we are optimistic about the prospects of neosaxitoxin and hope to see it approved and on the
market in the coming years.”
Dr Berde is the keynote speaker at Cawthron Institute’s virtual Annual Thomas Cawthron Memorial Lecture on Tuesday 19 October. His address is open to the public and will live-stream via www.cawthron.live from 5.30pm on Tuesday 19 October.
“I’m very much looking forward to sharing this exciting research with a global audience, particularly those in New
Zealand and Australia, and joining Cawthron researchers to talk about our collaboration during the live Q session with the audience.”