Natural compound from a deep-water marine sponge found to reduce pancreatic tumor size


Sea sponges are an ancient group of animals that appeared more than 600 million years ago that have many of the same genes as humans. These scientists are taking advantage of this similarity in human and sponge genomes to isolate marine natural compounds from these organisms to develop medicines useful in the treatment of human diseases such as cancer. Credit: Florida Atlantic University, Harbor Branch Oceanographic Institute

Scientists at Florida Atlantic University’s Harbor Branch Oceanographic Institute found that a deep-water marine sponge collected off of Fort Lauderdale’s coast contains leiodermatolide, a natural product that has the ability to inhibit the growth of cancer cells as well as block cancer cells from dividing using extremely low concentrations of the compound. This work resulted in the award of a patent from the U.S. Patent and Trademark Office protecting the use of the compound against various forms of cancer.

Sea sponges are an ancient group of animals that appeared more than 600 million years ago that have many of the same genes as humans. These scientists are taking advantage of this similarity in human and sponge genomes to isolate marine natural compounds from these organisms to develop medicines useful in the treatment of human diseases such as cancer. The researchers are expanding on their original findings, recently showing that leiodermatolide can reduce pancreatic tumor size in vivo, publishing the results of this study in the International Journal of Cancer (IJC).

Pancreatic cancer is the fourth leading cause of cancer death in the United States. Pancreatic cancer patients have less than a seven percent survival rate within five years of diagnosis, and 74 percent of patients die within the first year of diagnosis. In recent years, pancreatic cancer has received considerable attention because many well-known individuals have died from the disease. September marks seven years since the passing of actor Patrick Swayze, and October will be five years since the death of Apple Inc. co-founder Steve Jobs. The great tenor Luciano Pavarotti also died from this disease almost a decade ago.

In the article in IJC titled, “Leiodermatolide, a Novel Marine Natural Product, Has Potent Cytotoxic and Antimitotic Activity Against Cancer Cells, Appears to Affect Microtubule Dynamics, and Exhibits Antitumor Activity,” the researchers more fully define how this marine compound kills the cancer cells, and show that its effects occur not only against cells but that it also has the ability to reduce pancreatic cancer tumor weight.

Lead author Esther Guzmán, Ph.D., associate research professor at FAU Harbor Branch, along with colleagues and co-authors Amy Wright, Ph.D., research professor; Tara Pitts, biological scientist; and Priscilla Winder, Ph.D., research associate; as well as collaborators from Eisai Pharmaceuticals and the University of Central Florida, have been able to show that leiodermatolide induces programmed cell death in pancreatic cancer cells, and inhibits the growth of other cancer cells such as metastatic melanoma, colon cancer, lymphoma, and glioblastoma, a rare and deadly form of brain cancer.

Taxol™, a commonly used anti-cancer drug, works by interacting with tubulin and causing its polymerization. Leiodermatolide also interacts with tubulin but appears to affect microtubule dynamics through a unique mechanism of action compared to other microtubule interacting agents. In a mouse model of metastatic pancreatic cancer, leiodermatolide exhibited significant tumor reduction when compared to gemcitabine — the standard of care drug for pancreatic cancer — and controls.

“Given the uniqueness of its mechanism of action, its potency, its selectivity for cancer cells, and its in vivo efficacy, leiodermatolide is an extremely interesting compound that merits further studies to determine its therapeutic potential for addressing some of the most devastating forms of cancer,” said Guzmán.Natural products, or secondary metabolites, are small, organic molecules produced by organisms. Unlike primary metabolites such as sugars, fats or proteins, these molecules are not essential to sustain life; however, the compounds are thought to confer an evolutionary advantage to the producing organism. For example, if a sponge makes a compound that is toxic to predators or tastes bad, that sponge may be protected from being eaten, and will have an advantage over one that does not produce the compound. In addition to blocking predation, natural products can have many different functions within the producing organism.

FAU Harbor Branch’s drug discovery program, spearheaded by Wright, looks for treatments for pancreatic cancer and infectious diseases, and their scientists also have collaborations with other scientists working on other forms of cancer, malaria, tuberculosis, neurodegenerative disease and inflammation. “The primary goal of our marine biomedical and biotechnology program is to discover marine natural products with utility as medicines or as tools to better allow us to understand disease processes,” said Wright.

The research in this publication was funded by the National Institutes of Health (NIH RO1 CA093455), the State of Florida Center of Excellence in Biomedical & Marine Biotechnology (COE-HRE07), the National Oceanic and Atmospheric Administration (NOAA CIOERT NA09OAR4320073) and the Health Resources & Services Administration Center for Sustainable Use of Marine Resources (4C76HF00231-01-04).

Guzmán et al. Leiodermatolide, a novel marine natural product, has potent cytotoxic and antimitotic activity against cancer cells, appears to affect microtubule dynamics, and exhibits antitumor activity. Cancer Therapy and Prevention. 2016;DOI: 10.1002/ijc.30253 [Abstract]


Music demonstrated to alleviate cancer patients’ symptoms

We’ve all heard of laughter being the best medicine, but what about music?

A systematic review published by the Cochrane Library found that there is significant evidence that music interventions help alleviate symptoms of anxiety, pain and fatigue in cancer patients, while also boosting their quality of life.

Led by Joke Bradt, PhD, associate professor in Drexel University’s College of Nursing and Health Professions, a team looked into studies that examined the impact of music therapy (a personalized music experience offered by trained music therapists) and music medicine (listening to pre-recorded music provided by a doctor or nurse) on psychological and physical outcomes in people with cancer.

We found that music therapy interventions specifically help improve patients’ quality of life,” explained Bradt. “These are important findings as these outcomes play an important role in patients’ overall well-being.

A total of 52 trials were examined in the review, constituting of 3,731 participants with cancer. Twenty-three of the trials were categorised as music therapy and the remaining 29 were classified as music medicine interventions. Overall, one of the most impactful findings was that music interventions of all kinds resulted in a moderate-to-strong effect in reducing patients’ anxiety.

When it came to pain reduction, the researchers found a large treatment benefit; for fatigue, a small-to-moderate treatment effect was found. Small reductions in heart and respiratory rates, as well as lowered blood pressure, were also linked to music interventions.

The results of single studies suggest that music listening may reduce the need for anesthetics and analgesics, as well as decreased recovery time and duration of hospitalization, but more research is needed for these outcomes,” according to Bradt and her co-authors.

When comparing music therapy to music medicine, the team saw a moderate increase in patients’ quality of life when music therapy was applied. There was not a similar effect in the case of music medicine interventions.

“Both music medicine and music therapy interventions play an important role in cancer care but we didn’t quite know yet which interventions may be best suited for which type of outcome,” Bradt said
In light of the benefits to cancer patients’ quality of life, and specifically their levels of anxiety, pain and fatigue, the researchers hope music interventions will become more widespread.

We hope that the findings of this review will encourage health care providers in medical settings to seriously consider the use of music therapy in the psychosocial care of people with cancer,” Bradt said.

Bradt et al. Music interventions for improving psychological and physical outcomes in cancer patients. Cochrane Database of Systematic Reviews 2016;DOI: 10.1002/14651858.CD006911.pub3 [Article]