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Sanford-Burnham Science Blog

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Obesity research advances to clinical testing

by Patrick Bartosch on March 6, 2012 at 6:00 am | 8 Comments
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Brown Fat Cells

Orexin targets brown fat cells

Discoveries made in the laboratories of Sanford-Burnham will, for the first time, advance to the clinical research stage involving human studies at the Florida Hospital – Sanford-Burnham Translational Research Institute for Metabolism and Diabetes (TRI). The research will focus on orexin, an appetite-inducing hormone produced in the brain, which appears to resolve obesity without requiring a reduction in food consumption or elevation in physical activity. This research exemplifies the translational research focus at Sanford-Burnham and the TRI – advancing science from laboratory bench to patient bedside. The studies will provide insight into individual responses and contribute to the development of personalized therapies for treating metabolic diseases – a focus area for both the TRI and Sanford-Burnham.

Appetite-suppressing drugs have traditionally been the basis of weight-loss treatments since obesity is thought to be caused by excessive energy intake and low physical activity. However, appetite suppressants can produce unacceptable side effects and, after the treatment ends, patients usually the weight they lost. Recent data indicate that orexin leads to weight loss by releasing excess energy as heat instead of storing it.

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Sanford-Burnham experts talk about why Americans are fat

by Deborah Robison on January 6, 2012 at 10:11 am | 0 Comments
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Fireworks over the Sydney Opera House

Fireworks over the Sydney Opera House

New Year’s resolutions and dieting seem to go hand-in-hand. Setting a personal goal to lose weight and exercise more may jump-start the New Year but “February frustration” can derail even the most determined. Scientists in Sanford-Burnham’s Diabetes and Obesity Research Center recently shared their expertise on the causes of weight gain and the metabolic challenges that make it so hard to keep off the extra pounds. Their insights on genetics, diet, metabolism and lifestyle were included in a four-part series called “What’s making Americans so fat?” that ran in the Orlando Sentinel beginning January 1. Medical reporter Marni Jameson spoke with national obesity experts to compile a list of 40 reasons for why 60 percent of U.S. adults are obese or overweight.

“It’s not gluttony, and it’s not lack of willpower,” says Dr. Steven Smith, scientific director of the Florida Hospital – Sanford-Burnham Translational Research Institute for Metabolism and Diabetes. “No scientist in the field will say the problem is strictly one of willpower,” he says. “It’s a result of the way our genes are interacting with an environment that is stacked against them.”

Here’s an excerpt of how the experts weighed in:

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Fighting fat with fat

by Heather Buschman, Ph.D. on October 4, 2011 at 9:00 am | 0 Comments
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Loss of orexin impairs brown fat function and promotes obesity in mice. The leaner mouse with functional brown fat (left) dissipates considerable amounts of energy as heat. The orexin-deficient mouse (right) lacks fat fuel and active mitochondria, thus storing energy as fat instead of burning it. (Image by Peter Allen, UCSB)

Loss of orexin impairs brown fat function and promotes obesity in mice. The leaner mouse with functional brown fat (left) dissipates considerable amounts of energy as heat. The orexin-deficient mouse (right) lacks fat fuel and active mitochondria, thus storing energy as fat instead of burning it. (Image by Peter Allen, UCSB)

The fat we typically think of as body fat is called white fat. But there’s another type—known as brown fat—that does more than just store fat. It burns fat. Scientists used to think that brown fat disappeared after infancy, but recent advances in imaging technology led to its rediscovery in adult humans. Because brown fat is so full of blood vessels and mitochondria—that’s what makes it brown—it’s very good at converting calories into energy, a process that malfunctions in obesity.

In a study published October 5 in Cell Metabolism, Sanford-Burnham researchers discovered that orexin, a hormone produced in the brain, activates calorie-burning brown fat in mice. Orexin deficiency is associated with obesity, suggesting that orexin supplementation could provide a new therapeutic approach for the treatment of obesity and other metabolic disorders. Most current weight loss drugs are aimed at reducing a person’s appetite. An orexin-based therapy would represent a new class of fat-fighting drugs—one that focuses on peripheral fat-burning tissue rather than the brain’s appetite control center.

“Our study provides a possible reason why some people are overweight or obese despite the fact that they don’t overeat—they might lack the orexin necessary to activate brown fat and increase energy expenditure,” explains Dr. Devanjan Sikder, senior author of the study and assistant professor in Sanford-Burnham’s Diabetes and Obesity Research Center, located in Orlando’s Medical City at Lake Nona.

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The Sanford-Burnham life of Henrietta Lacks

by Heather Buschman, Ph.D. on February 22, 2011 at 9:02 am | 1 comment
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I was in high school when I first heard of Henrietta Lacks. It was a special event – scientists from Cornell University spent the day teaching us some common laboratory techniques (a rare treat for a budding scientist in a small town). It was the first time I held a pipette, and the first time I ran a gel. We also learned about karyotyping that day – a technique that lets a scientist see all of a person’s chromosomes in order to look for abnormalities. It just so happened that the cells we karyotyped that day were HeLa cells, named for the woman from whom they originated – Henrietta Lacks. The Cornell scientist briefly explained that Henrietta died of cervical cancer in the 1950s, HeLa cells were isolated from her tumor and they have continued replicating in labs around the world ever since.That day I learned about Henrietta Lacks’ cells, and 15 years later I learned about Henrietta Lacks the person. I recently finished the book “The Immortal Life of Henrietta Lacks” by Rebecca Skloot. Ms. Skloot spent an incredible 10 years getting to know Henrietta Lacks’ family (still living in Baltimore) and researching everything she could about Henrietta’s life and her amazing contribution to science. The resulting book was a captivating read and raised more than a few interesting ethical questions: Did doctors have the right to take and propagate Henrietta’s tumor cells without her permission? Should her children be compensated? Why didn’t anyone take the time to explain it all to Henrietta’s children until Ms. Skloot came along?

A few weeks ago, on Twitter, Ms. Skloot (@RebbecaSkloot) asked her followers, “How has HeLa affected u? The way u see/do science? Please share ur story about HeLa & Immortal Life of Henrietta Lacks.”

This led me to wonder… I know that HeLa cells are just as ubiquitous at Sanford-Burnham as in other labs, but exactly how are HeLa cells being used to advance science here? So I started asking around.

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Spotlight on disease: type 2 diabetes

by Heather Buschman, Ph.D. on January 14, 2011 at 2:29 pm | 4 Comments
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Diabetes results from a lack of insulin, a hormone that stimulates cells to take up glucose (a type of sugar) from the bloodstream. Cells need glucose as fuel to produce energy. Type 1 diabeticslack insulin because their immune systems destroy the pancreatic cells that produce it. Type 2 diabetics progress through two stages of the disease. In the first stage, called “insulin resistance”, cells no longer respond to insulin.  The pancreas compensates for this resistance by producing more insulin. As insulin resistance persists, the pancreas cannot make enough insulin to keep up with the increased demand. The pancreas eventually shuts down insulin production altogether, resulting in type 2 diabetes.Without sugar that can be converted to energy, cells starve and glucose levels build up in the blood, which can lead to life-threatening complications such as cardiovascular disease. Since fat interferes with the body’s ability to process insulin and overweight people are at increased risk for the disease, type 2 diabetes is sometimes called “obesity-related” diabetes. Type 2 diabetics are encouraged to carefully monitor their diet and exercise in order to prevent dangerous fluctuations in blood sugar levels.

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TEDx3: three days, three cities, three experiences

by Heather Buschman, Ph.D. on December 6, 2010 at 2:36 pm | 1 comment
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Dr. Devanjan Sikder speaking at TEDxOrlando on November 13, 2010 (Photo courtesy of the TEDxOrlando Team)

Dr. Devanjan Sikder speaking at TEDxOrlando (Photo courtesy of the TEDxOrlando Team)

Can’t get enough TED? Neither can we. All three of Sanford-Burnham’s home cities have recently hosted TEDx conferences. In October, Dr. Jamey Marth wowed Santa Barbara with the future of nanomedicine at TEDxAmericanRiviera. Last month, Dr. Devanjan Sikder talked obesity at the inaugural TEDxOrlando and I recently had the chance to attend TEDxSanDiego.

Like most participants (we were considered participants, not just an audience), I have long admired TED talks and jumped at the chance to see one in person. TED (short for Technology, Entertainment, Design) has become so popular that local TEDx spin-offs (where x = independently organized) are springing up everywhere. The TED formula for community building brings together people who are passionate about ideas that matter and creates a forum where people with big ideas can connect.

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