News / Science & Technology

Cockroaches Could Lead to New Antibiotics

The female emerald cockroach wasp leads her prey by the antenna after stinging it to render it docile. The egg she lays on the roach will hatch, burrow inside, and feed on the roach as the wasp larva develops. (Courtesy Gudrun Herzner)
The female emerald cockroach wasp leads her prey by the antenna after stinging it to render it docile. The egg she lays on the roach will hatch, burrow inside, and feed on the roach as the wasp larva develops. (Courtesy Gudrun Herzner)
Most people might see cockroaches as good-for-nothing pests, but this germ-ridden insect could be an indirect source of new antibiotics for humans.

Cockroaches host the larvae of a parasitic type of wasp, which spend their formative days eating the bacteria-laden body of the cockroach from the inside out.

Researchers have discovered the wasp larva secretes chemicals that sanitize the decidedly unsanitary guts of the cockroach.

These germ-killing chemicals could eventually be developed for human uses.

Cockroach cradle

For the developing larvae, “the cockroach is the only food source and the cradle,” says biologist Gudrun Herzner at the University of Regensburg in Germany.

It’s a cradle that needs a good cleaning, because cockroaches spend time in some very unsanitary places, from trash heaps to public toilets, where you’ll find a cornucopia of bacteria, fungi and viruses that can make you, and the emerald wasp larva, sick.

While the young wasp’s hygiene challenges may seem extreme, Herzner says they are basically the same problems we all face. “The larva has to protect, first, its food from degradation by microbes, and then it has to protect itself from foodborne illnesses that these microbes might cause.”

Sanitizer dispenser

As the wasp larva munches its way through the microbe-laden body of the cockroach, it produces generous amounts of a clear liquid.

Herzner and her colleagues found this liquid to contain a blend of antimicrobial substances, according to their study published in the Proceedings of the National Academy of Sciences.

"The larvae seem to disperse this secretion thoroughly inside the cockroach, and in this way sanitize their cockroach hosts,” Herzner says.

One of the chemicals fights the germs that cause tuberculosis; another has a broad range of activity against bacteria, fungi, and viruses such as hepatitis C.

Herzner says it is the first time researchers have found insects using this chemical against microbes.

Insect drugs

But it’s probably not the last insect antimicrobial discovery.

Most antibiotics that doctors use have been discovered among microbes living in the soil, but if researchers turn to the insect world, microbiologist Julian Davies, at the University of British Columbia, says, “You can have a potentially new source of antibiotics. People have been looking at this. Nothing’s come out of it yet, but they’re certainly looking at it.”

Antimicrobials have been discovered everywhere from frog skin to panda blood, but none of them have made it to the medicine cabinet yet.

Davies says it can be hard to isolate useful quantities of the active chemicals in these sources, and they may be difficult chemicals to produce in the lab.

Plus, Davies says, “It’s fine to find an antibiotic, but half of them are toxic.”

Scientists are working to overcome these hurdles.

Bacteria talking?

Davies says these chemicals may be more than just microbe killers. He points to the emerging field of research on microbe-to-microbe chemical communication.

“And you can ask the question, ‘Are they killing each other, or are they talking to each other?’”

But, with antibiotic-resistant infections a growing threat worldwide, killing the microbes is scientists' current priority.

You May Like

Jihadist Assassin says Goal of Tunisia Murders Was Chaos

Abu Muqatil at-Tunusi’s remarks in a propaganda interview also cast light on attack on Bardo Museum More

Russia Denies License to Tatar-Language TV Station in Crimea

OSCE official says denial shows 'politically selective censorship of free and independent voices in Crimea is continuing' More

Kenyan Startups Tackle Expensive Remittances Through Bitcoin

Some think services could give Western Union a run for its money, though others say it’s still got a long way to go More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
For Obama, It's More Business Than Friendships With World Leadersi
X
Aru Pande
April 01, 2015 9:09 PM
The rift between President Barack Obama and Israeli Prime Minister Benjamin Netanyahu has put a spotlight on the importance of the American leader’s personal relationships with other world leaders and what role such friendships play in foreign policy. VOA's Aru Pande reports.
Video

Video For Obama, It's More Business Than Friendships With World Leaders

The rift between President Barack Obama and Israeli Prime Minister Benjamin Netanyahu has put a spotlight on the importance of the American leader’s personal relationships with other world leaders and what role such friendships play in foreign policy. VOA's Aru Pande reports.
Video

Video Buhari: Nigeria Has ‘Embraced Democracy’

Nigeria woke up to a new president-elect Wednesday, Muhammadu Buhari. But people say democracy is the real winner as the country embarks on its first peaceful handover of power since the end of military rule in 1999. VOA’s Anne Look reports from Abuja.
Video

Video Tiny Camera Sees Inside Blood Vessels

Ahead of any surgical procedure, doctors try to learn as much as possible about the state of the organs they plan to operate on. A new camera developed in the Netherlands can now make that easier - giving surgeons an incredibly detailed look inside blood vessels, all the way to the patient’s heart. VOA’s George Putic has more.
Video

Video Latin American Groups Seek Fans at Texas Music Festival

Latin American music groups played all over Austin, Texas, during the recent South by Southwest festival, and some made fans out of locals as well as people from around the world who had come to hear music. Such exposure can boost such groups' image back home. VOA’s Greg Flakus reports.
Video

Video Stockton Community, Police, Work to Improve Relations

Relations are tense between minority communities and police departments around the United States following police shootings that have generated widely-publicized protests. VOA's Mike O’Sullivan reports from Stockton, California, where police and community groups are working toward solutions, with backing from Washington.
Video

Video Indiana Controversy Highlights Divergent Meanings of Religious Freedom

Indiana’s state government has triggered a nationwide controversy by approving a law that critics say is aimed at allowing discrimination against gays and lesbians. The controversy stems from divergent notions of religious freedom in America. VOA's Jerome Socolovsky reports.
Video

Video Report: State of Black America a 'Tale of Two Nations'

The National Urban League has described this year's "State of Black America" report as a "tale of two nations." The group's annual report, released earlier this month (March), found that under an equality index African Americans had only 72% parity compared to whites in areas such as education, economics, health, social justice and civic engagement. It’s a gap that educators and students at Brooklyn’s Medgar Evers College are looking to close. VOA's Daniela Schrier reports from the school.
Video

Video Film Tells Story of Musicians in Mali Threatened by Jihadists

At this year's annual South by Southwest film and music festival in Austin, Texas, some musicians from Mali were on hand to promote a film about how their lives were upturned by jihadists who destroyed ancient treasures in the city of Timbuktu and prohibited anyone from playing music under threat of death. As VOA’s Greg Flakus reports from Austin, some are afraid to return to their hometowns even though the jihadists are no longer in control there.
Video

Video Ebola Vaccine Trials Underway in West Africa

Ebola has claimed the lives of more than 10,000 people in West Africa. Since last summer, researchers have rushed to get anti-Ebola vaccines into clinical trials. While it's too early to say that any of the potential vaccines work, some scientists say they are seeing strong results from some of the studies. VOA's Carol Pearson reports.
Video

Video Philippines Wants Tourists Spending Money at New Casinos

Tourism is a multi-billion dollar industry in the Philippines. Close to five million foreign visitors traveled there last year, perhaps lured by the country’s tropical beaches. But Jason Strother reports from Manila that the country hopes to entice more travelers to stay indoors and spend money inside new casinos.
Video

Video Civilian Casualties Push Men to Join Rebels in Ukraine

The continued fighting in eastern Ukraine and the shelling of civilian neighborhoods seem to be pushing more men to join the separatist fighters. Many of the new recruits are residents of Ukraine made bitter by new grievances, as well as old. VOA's Patrick Wells reports.
Video

Video Cambodian Land Grabs Threaten Traditional Communities

Indigenous communities in Cambodia's Ratanakiri province say the government’s economic land concession policy is taking away their land and traditional way of life, making many fear that their identity will soon be lost. Local authorities, though, have denied this is the case. VOA's Say Mony went to investigate and filed this report, narrated by Colin Lovett.

VOA Blogs

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More