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Doctors are running out of effective antibiotics, as bacteria evolve ways to evade one drug after another. Now DARPA has called for alternatives to conventional antibiotics. Nanotechnologist Chad Mirkin discusses one such weapon—tiny globs of DNA and RNA that can switch off the bugs' antibiotic resistance. Nanotechnologist Chad Mirkin discusses next-generation antibiotics that target a bacterium's DNA.
Copyright © 2011 National Public Radio®. For personal, noncommercial use only. See Terms of Use. For other uses, prior permission required.IRA FLATOW, HOST:
This is SCIENCE FRIDAY. I'm Ira Flatow. In the battle of antibiotics versus bacteria, the bugs are winning. Not only are they evolving resistance to our arsenal of drugs, but we're running out of new antibiotics to launch at them. And antibiotic-resistant bacteria aren't just a problem for hospitals and patients. Think about wounded soldiers on the battlefield, infected with superbugs or a bioterrorism attack using resistant or engineered pathogens.
Would we be able to handle it? That's why DARPA, the research arm of the Defense Department, has called on scientists to develop new, next-generation antibiotics. One promising technology is DNA-based drugs that not only target the superbugs, but they can evolve right along with them, preventing antibiotic resistance.
Chad Mirkin is director of the International Institute for Nanotechnology at Northwestern University in Evanston, Illinois. Welcome back to SCIENCE FRIDAY, Dr. Mirkin.
DR. CHAD MIRKIN: It's a pleasure to be here.
FLATOW: These are little nanoparticle-sort-of-sized things?
MIRKIN: Yeah, they're really interesting structures. In fact, their structure is made out of DNA or RNA that are made on a gold nanoparticle, in fact a variety of different types of particles, but they're strands of DNA that are arranged on the surface of these spherical particles.
And when you make them in this manner, they have properties that are very different from the normal type of DNA that we're all familiar with, duplex, linear type of DNA, and one of those properties is they have the ability to enter cells, including bacterial cells, very, very efficiently.
FLATOW: And when they get in the cell, what do they do?
MIRKIN: Well, the beauty is what we can do. We can design them so that they can go in and flip switches, genetic switches, that either turn off resistance so that a conventional antibiotic will work or, better yet, stop replication and ultimately cause bacterial cell death.
FLATOW: So is there then no need for a standard antibiotic?
MIRKIN: Well, this would be a different route to the standard antibiotics, which are typically small molecules. This would be a genetic-based root, and the beauty of that is that, as you said in your opening, you can move with the bug. As the bug evolves, you can change the sequence and target different genetic components of the bug so that you can constantly battle its response to the new drug.
FLATOW: So as the bug changes, you tailor-make the new stuff to mimic what the bug is doing.
MIRKIN: That's the idea. I mean, this is very early in this whole process. This is actually part of a big platform that we call spherical nucleic acids that we've been developing at Northwestern now for about 15 years and are part of a company that we started called Arosense(ph) that can really go after any sort of genetic disease.
And that's the beauty of it: You can tailor it on a disease-by-disease basis, as long as you have good genetic information about the different types of switches that you have to turn on or off to effect treatment.
FLATOW: If you have - then if you have genetic diseases that are not, you know, antibiotic related, maybe like cancer or something like that, could you not go in and stop the cancers from spreading that way?
MIRKIN: That's exactly right. In fact, we have a very active program in that regard. The beauty of these constructs, they're part of a larger field called gene regulation, which actually has won the Nobel Prize for its promise, the idea that you could use this - a concept of switching off genes or down-regulating genes so that you could adjust protein levels and take effectively a diseased cell and make it healthy, or in the case of a cancer selectively cause it to die.
The problem with conventional approaches is that they often have to have materials to help carry the genetic material into the cells, and they're not very good at targeting. In addition, they cause all sorts of toxic side effects. So you run into the problem where the therapy causes as many problems as the disease originally did.
In this case, these structures, this kind of spherical form of nucleic acid, has this incredible property that it requires no co-carrier. You can treat diseases based upon that genetic information, and you can either locally deliver - for example we have projects with a dermatologist named Amy Paller, where we have the first constructs that can be delivered through the skin to go after things like melanoma and psoriasis.
Or another project involves a guy named Alex Steig(ph), where we're going after brain cancer, and we can systemically deliver these. They go everywhere, but they cause no toxic side effects, and so they accumulate in a lot of cells, including tumor cells in the brain, and you can selectively go after those cells based upon the genetic differences of those cells causing them to selectively die.
FLATOW: So even though they get into the cells, their little genetic pieces don't match up with the wrong cells then?
MIRKIN: That's exactly right. You've got almost a lock-and-key type of shutoff here.
FLATOW: You know, there are a lot of people who were concerned about pumping a bunch of nanoparticles into their body, and I guess they would be concerned about this, too.
MIRKIN: Well, potentially. I mean, the interesting thing about this is, so typically, we will use a gold particle, and we'll arrange the nucleic acid, the DNA or RNA on the surface on the particle. And that itself can be a therapeutic, and we have a lot of therapeutic leads based upon those types of materials.
But we've also figured out ways of what's called cross-linking, attaching the DNA strands on the surface of the particle to each other, and we can dissolve the gold, and we literally can use effectively pure nucleic acid in that case. And those types of constructs work just as well.
FLATOW: All right, now for the $64 question, which I know you knew would be coming, right? You could probably ask it of yourself: When are we going to have a product that is going to be available to try?
MIRKIN: Well, I think the more important question to ask is when are we going to go into trials. So we have incredible in-vivo data in animals, small animals, that suggests that this works and works extremely well. And it can do things that frankly no other gene regulation construct has ever done before, and that is delivery through the skin, very effectively, knock down in animals and also this idea of systemic delivery.
And what's really difficult in this field is getting these big drugs - because they're big particles compared to the small-molecule drugs that we've been talking about - getting them across the blood-brain barrier. And the beautiful thing about these constructs is they show the ability to do that.
And so the real question is how soon will we be into trials? And we're really shooting for next year. So we're hopeful that we're going to be into human trials sometime next year, pushing for the early part but certainly before the end of the year.
FLATOW: And as far as antibiotics are considered, do you consider them old hat now?
MIRKIN: No, I wouldn't consider them old hat. I mean, this may end up being a co-therapy, or it may be a replacement for existing antibiotics. But a lot of work has to be done. So the DARPA program is actually new. It was I think really insightful for them to take this on and to challenge the community to come up with new ways because the world desperately needs these types of constructs.
We have to really go through and validate these in the context of bacteria, like we have in the context of diseases like cancer in small animals. And so what we're going to be doing over the next year on the bacteria side of things is really starting with cells and then moving up through bacteria and then animal studies.
FLATOW: And why is it that DARPA has to jump in here? What's wrong with our own medical system?
MIRKIN: Well, DARPA - I don't know if it's a matter of what's wrong. It's a matter of creating challenges. And so there are business challenges, and one of the problems, of course, in the antibiotic area is that from a drug standpoint, they're not nearly as big a market as, for example, an oncology type of drug.
But there are also just challenges in - grand challenges in terms of chemistry and material science that have to be overcome, and you have to get a lot of different folks together to solve big problems. And DARPA is extremely good at doing that.
They move very rapidly when they recognize you have a big problem. They're able to first of all put together substantial resources, which is needed in this case, to challenge the academic community in this case to come up with alternative solutions and to think outside of the box. And they're one of the best agencies for doing that.
FLATOW: So what you're saying is that the people are willing to spend money on the military to do this where they might not in the civilian case.
MIRKIN: Well, yeah, the military has a different set of drivers, right. So they're not...
FLATOW: So where we used to think of the military as making weapons and transistors and things, they're now making drugs.
MIRKIN: They make a lot of things. They made our GPS, as well. They make a lot of things that positively affect civilians in day-to-day life, and this would be a big one.
FLATOW: All right, thank you very much, Dr. Mirkin, for taking time to be with us. We'll have you back on when you get some results, when the trials begin.
MIRKIN: Thank you.
FLATOW: Chad Mirkin is director of the International Institute for Nanotechnology at Northwestern University in Evanston, Illinois.
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An orgasm has now been imaged in 3D video in the brain as it happens - and for possibly the first time in the history of science, women came first.
The video, which was presented at the recent Society for Neuroscience conference in Washington, D.C., is the first to look at the exact order in which women's brain regions are activated in the progression that culminates in sexual climax. The findings have not yet been peer reviewed for publication.
While this may seem like a silly line of research, in fact, understanding how the brain experiences the most pleasurable sensations may be essential for figuring out what underlies conditions in which desire and motivation go awry, like addiction and depression.
Lead author Barry Komisaruk, professor of psychology at Rutgers University, imaged brain activity in several women who were able to masturbate to orgasm in the decidedly unsexy atmosphere of a functional MRI machine. (Orgasm was achieved by either manual stimulation or use of a "passive dildo" in the form of a Lucite rod; vibrators contain metal, which cannot be placed in magnetic scanners.)
MORE: Mind Reading: What We Can Learn From the Dutch About Teen Sex
Komisaruk discovered activity in more than 80 regions of the brain, including the prefrontal cortex, which is involved in higher-order thinking, and which earlier imaging of the female orgasm by Dutch researchers had found to be inactive. "There's an apparent contradiction in the literature," says Komisaruk. "The group in Holland says that the frontal cortex goes down in activity during orgasm and we see that it goes up."
That could be due to differences in technical scanning, Komisaruk says. Or, a more interesting reason may involve the fact that in the Dutch study, sexual stimulation was applied by the women's partners, rather than themselves. "It could be different [because] women orgasm-inducing in themselves may involve executive control characteristic of the prefrontal cortex, whereas in partner-induced stimulation, women may surrender to their partner and that could be the basis for the reduction in activity," he explains.
Penalty per pay period that Wal-Mart's health insurance plans will require of employees who smoke in 2012. The cost will amount to $260 to $2,340 extra per year for those who want health coverage. According to the benefits consulting firm Mercer, several other large employers also charge higher premiums to workers who smoke; among the largest employers, about 28% adjust their premiums based on workers' tobacco use. [via The New York Times]
Welcome back! This week on the podcast: why dieters can't seem to keep the weight off, a new breed of super broccoli that promises to lower your cholesterol, and research suggesting that kids' aggression can be traced back to Mom. Listen by clicking the play button below, or go to iTunes. Better yet, download the podcast to your mobile device — and subscribe for free so that it's updated each week automatically.
For reference while listening, here are the stories we discussed:
Why Dieters Can't Keep the Weight OffU.K. Scientists Grow Super BroccoliKids Behaving Badly? Blame It on MomDo All Women Need Genetic Testing Before Pregnancy?A GPS-Enabled Shoe to Track Wandering Alzheimer's PatientsThis week, in the absence of our usual stalwart host, John Cloud (@JohnAshleyCloud) — momentarily felled by a nasty bug that's been going around (feel better, John!) — TIME editor-at-large and podcast regular Belinda Luscombe (@youseless) deftly took over the reins. We also welcomed TIME senior editor and resident food-obsessive Julie Rawe (@julierawe) as a first-time guest.
With thanks to our indefatigable producer, Valerie Lapinski (@lapinski), we all had a lot of fun chatting this week, so I hope you'll have fun listening.
Please leave your thoughts and comments below. (You've got to give John something to do while he's laid up.) See you next week!
Related Topics: aggression, aggressive kids, Alzheimer's, dieting, genetic testing, gps shoes, healthland podcast, high cholesterol, Multimedia, Podcast, Pregnancy, super broccoli, weight lossMore ways to get Healthland
Jacksonville, Florida (CNN) -- When the topic of HIV/AIDS enters a conversation, Earl Thompson hears that it's "just what gays get."
"It's not a gay disease," said Thompson. "It's a human disease."
When a person gets a disease like cancer, support pours in, said Thompson, a slender 27-year-old with a boyish face. Family and friends fund raise and make sure their loved one gets proper care. But that's not the case with HIV.
"It's like hush-hush," said Thompson, a Jacksonville native, who learned before his birthday in April that he has HIV. "You feel unlovable. You feel tainted. They're going to point a finger at me and be judging me.
"Just from the community, I know they don't talk about it. Jacksonville has many years before we're close to Miami, Orlando or Tampa. If something goes wrong, you don't talk about it."
It's a problem all across the Bible Belt. The Southeast is disproportionately struck with higher HIV/AIDS rates than much of the rest of the country.
Dealing with the epidemic in the South "is extremely challenging, because the stigma and discrimination is worse," said Dr. Kevin Fenton, director of the National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention at the Centers for Disease Control and Prevention. "There is less discourse around prevention, sexual health, comprehensive sex education in schools or having strong, community-based advocacy activities."
Pastor fights HIV stigma in rural town
Jacksonville has the fifth-highest number of AIDS diagnoses among U.S. cities, according to CDC statistics from 2008.
The state says this could have been a statistical aberration because surveillance methods and HIV/AIDS reporting laws changed in Florida in 2007, causing fluctuations in the data.
But local HIV advocates in northeast Florida say the problem is a real one, not just a statistical blip.
"Here in Jacksonville, we're kind of the buckle in the Bible belt," said Donna Fuchs, executive director of Northeast Florida AIDS Network. "HIV carries a huge stigma in our city."
Fuchs said the organization had trouble finding office space in 2000. One property owner refused to rent to the group, saying he didn't want people with AIDS in his buildings.
Today, the office sits on a quiet, tree-lined street with a simple sign that reads: NFAN. A red ribbon, the ubiquitous sign for HIV/AIDS, usually adorns the logo for the organization. But not here.
"Clients didn't want a red ribbon on the door," said Fuchs. "We had to take it down."
Four blocks away, there is another HIV organization -- one named for NBA star Magic Johnson, who revealed in 1991 that he is HIV-positive.
When that clinic opened a decade ago, the ribbon-cutting ceremony was held inside the lobby. Organizers moved the event indoors because people feared being seen and associated with the disease.
Today, that one-story clinic tucked behind a towering magnolia tree no longer bears Johnson's name.
"The only way we can get people to come through the front door is to create a fictitious name." said Todd Reese, associate director of Health Care Center operations at the AIDS Healthcare Foundation. "No one walks into any building or floor that has any association with HIV."
Although visible HIV signs may be scrubbed from public view, the epidemic has worsened.
HIV cases in Duval County, which mostly consists of Jacksonville, increased by 33% in the first half of 2011. This year, the county Health Department reports an increase in new cases.
"It's really not acceptable," said Dr. Bob Harmon, the county's Health Department director. "This disease is ruining lives, and it's still killing people, especially low-income people who don't get tested enough and who don't get treated early."
Several HIV/AIDS advocates in Jacksonville criticized sex education in schools that emphasized abstinence. The mentality is that HIV/AIDS is not an issue here, several advocates said.
"Denial is the biggest problem," said Reese.
And those who reveal their HIV status struggle to find acceptance.
Thompson observed that some people who knew about his HIV status avoided physical contact with him. In social settings, they watched their drinks to make sure their glasses didn't get mixed up.
"Sometimes you feel like a pin cushion, like you're never going to find acceptance," Thompson said. "You feel like you're going to be looked at as a disease, not as a person."
No one walks into any building or floor that has any association with HIV.What perpetuates the epidemic is a social issue, Reese said.
In Florida, the HIV/AIDS focus has historically been placed in southern part of the state. Some of the earliest HIV cases were found in Miami and in the Haitian immigrant population in South Florida. Miami still struggles with new HIV/AIDS cases; often, it has the highest AIDS rates in the country.
"You can go to Miami and you can put up a billboard, you can talk about condoms, AIDS and sex," Reese said. "You can't do that in Jacksonville. People will be offended. They don't want to talk about it or see it. They don't want to see billboards about it."
And Jacksonville is no small town: It has about 821,000 residents.
iReporters share their stories on World AIDS Day
It's a different population, said Harmon.
"In north Florida, our population profile is more like Georgia, Alabama, Mississippi than it is central and south Florida. That generally means higher rates of poverty, lower rates of completing high school and college, and higher percentage of African-American population."
Duval County has a high percentage of African-Americans, and in Jacksonville, 71% of the total HIV cases are African-Americans.
Wade Price, 46, is a black gay man, proud father of three and grandfather of three.
He keeps a half-dozen orange prescription bottles of anti-HIV medications on his nightstand next to his red leather-bound Bible. The pages of his well-worn Bible are patchworks of green and orange highlights. He reads scriptures every night and attends a Baptist church twice a week.
Because his faith is crucial, Price decided to tell the head minister of his church how he struggled with being gay. He wanted to have prayer meetings with ministers and start a church support group.
Price told the minister: "I'm not the only one. Lots of people are keeping quiet, living double lives."
The minister rebuffed him, saying, "Wow, it's times like this, I don't like being a minister."
"That's one aspect of black churches," Price said. "They want to turn blind eyes to it. ... I'm fighting this battle on my own."
Price left that church and found another one last month that is more accepting.
"We pretend it's not happening," Price said. "The virus is being spread. You want to pretend like sex isn't happening. They say, 'Condoms, oh, no! That's not for God!' What's not for God is living with ignorance."
The social climate in northern Florida tends to be more conservative, said Harmon.
"There may be a reluctance to talk about this in the family, in the church, in other social settings and to perhaps ignore it," he said.
But there are signs of change. Churches in the community have started to talk about the HIV/AIDS epidemic, said Veronica Hicks, 50.
Hicks has never felt the need to hide her AIDS diagnosis and told her fellow church members and her pastor.
"They embrace me with it," she said. And Hicks's church has already started an HIV/AIDS testing and awareness ministry in Jacksonville.
While stigma persists in the community, it's getting better, she said.
She reported seeing growing HIV support groups, increasing turnout at community HIV/AIDS events and a recent line of people waiting to get tested at a mobile clinic.
"It shows me that people are willing to become more educated because HIV is prevalent and relevant."
SolarCity has received financing from Bank of America Merrill Lynch to install solar electricity systems on houses on military bases, like one here at Soaring Heights Communities at Davis Monthan Air Force Base outside Tucson, Ariz.
We've heard a lot about Solyndra, a solar panel maker that went bankrupt despite lots of federal subsidies. But on Wednesday, a solar installation company and one of the country's biggest banks announced a billion-dollar project to put solar systems on the roofs of military housing. And they're doing it without the kind of federal help Solyndra got.
When SolarCity CEO Lyndon Rive came up with a plan to put solar on the rooftops of military housing around the country, he was sure he'd need federal backing to get loans for such a big project.
But after his company and the Department of Energy missed a deadline to get that help, SolarCity and its lender, Bank of America Merrill Lynch, didn't give up.
Now they're announcing a deal to install solar systems on up to 120,000 military homes.
"It will be the largest residential deployment of solar in American history," says Rive.
The deal signals that companies are finally finding a way around what has long been one of the biggest obstacles to broader adoption of solar power — inadequate financing.
"There really weren't a lot of financing tools available, so it was done one rooftop at a time," said Jonathan Plowe, who heads up the new energy team at Bank of America Merrill Lynch.
Workers install solar panels at the Soaring Heights Communities at Davis-Monthan Air Force Base outside Tucson, Ariz.
He says the real breakthrough represented by his company's agreement with SolarCity is that it puts long-term financing in place for so many installations. It's the first time a project of this scale has been launched without federal loan guarantees. That's when the government lowers the risk for lenders by basically co-signing the loans.
Even without loan guarantees, solar projects still get tax credits and other subsidies.
Plowe says there's lots of demand for rooftop solar, so his Bank of America team plans to do more of these projects.
"As the costs of the systems continue to come down and the cost of the capital continues to come down, the industry will be able to continue to grow," says Plowe.
Bank of America will provide up to $350 million, so SolarCity will need to attract additional investors for what it hopes will be a $1 billion project.
'Economies Of Scale'
SolarCity will install and own the solar systems and sell the electricity to the private companies that manage military housing at a discount of about 10 percent compared with utility prices, according to the company.
It's a business model that now dominates the solar industry. The lender gained confidence that SolarCity was a good bet because of the work it had done on earlier projects.
The company installed solar systems at Davis-Monthan Air Force base in Tucson, Ariz., and it is working on a project at the joint Navy-Air Force Base Pearl Harbor-Hickam near Honolulu.
Rive says by installing lots of solar panels in one area, the company has shown it can save money and turn solar power into a reliable business.
"It worked extremely well. It also allowed us as a company to get economies of scale on a concentrated area," Rive said. "There's a lot of inefficiencies when you have to go back and forth to different homes in different communities."
Lend Lease, the company that manages the housing at both bases, says it's saving lots of money that it can use to build more housing and update existing units.
Lend Lease manages 40,000 housing units at 21 military bases around the country. It's planning to do more solar projects, including some with SolarCity.
"They've demonstrated that they can get extremely competitive pricing for solar. So who wouldn't do it if you could save money and you could get the green benefits of doing that?" says Simon Muir, a vice president of Lend Lease.
The solar installation industry in the U.S. has doubled in each of the past two years, according to Rhone Resch, who heads the Solar Energy Industries Association.
"The fact that SolarCity is now able to attract money, I think, really demonstrates how mainstream solar has become, how confident investors are in both the technology, its performance and its returns," Resch says.
Solar still only provides a tiny portion of U.S. electricity, and it has not yet taken off as a major electricity source.
But Mark Bachman, an analyst specializing in the solar industry for the investment banking firm Avian Securities, is more cautious.
"I think it's gaining momentum. I wouldn't call it a breakthrough time in the U.S.," he says.
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A race to extract 2 billion barrels of oil means low unemployment, but residents question the cost.
The proposal's goal is to improve energy performance by 20 percent by 2020.
But the legislation under consideration by Congress could lead to a dangerous spike in oil prices.