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Brown fat transplants help mice lose weight

2012-12-10
(Press-News.org) Brown fat is a specialized tissue in mammals that is used to generate heat (thermogenesis). While white fat is associated with increased body mass, brown fat is associated with a lower body mass index (BMI) and consumes large amounts of energy. Researchers have long been intrigued by the idea of brown fat transplant as a therapeutic tool to combat obesity. In this issue of the Journal of Clinical Investigation, researchers led by Laurie Goodyear at the Joslin Diabetes Center in Boston, performed brown fat transplants in mice to determine if this intervention could treat obesity. Using mice fed either a normal diet or a high-fat diet, Goodyear and colleagues demonstrated that brown fat transplants significantly decreased body weight and improved insulin sensitivity and glucose metabolism. Additionally, the transplanted brown fat secreted hormones, including IL-6, which mediated metabolic effects throughout the body. This study establishes brown fat as an important regulator of metabolism and suggests that this tissue could be an important therapeutic target in the treatment of obesity-related diseases.

###TITLE:

Brown adipose tissue regulates glucose homeostasis and insulin sensitivity

AUTHOR CONTACT:

Laurie Goodyear

Joslin Diabetes Center, Boston, MA, USA

Phone: 617-732-2573; E-mail: laurie.goodyear@joslin.harvard.edu


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JCI early table of contents for Dec. 10, 2012

2012-12-10
Brown fat transplants help mice lose weight Brown fat is a specialized tissue in mammals that is used to generate heat (thermogenesis). While white fat is associated with increased body mass, brown fat is associated with a lower body mass index (BMI) and consumes large amounts of energy. Researchers have long been intrigued by the idea of brown fat transplant as a therapeutic tool to combat obesity. In this issue of the Journal of Clinical Investigation, researchers led by Laurie Goodyear at the Joslin Diabetes Center in Boston, performed brown fat transplants in mice ...

Study identifies targeted molecular therapy for untreatable NF1 tumors

2012-12-10
CINCINNATI – Researchers conducting a preclinical study in mice successfully used targeted molecular therapy to block mostly untreatable nerve tumors that develop in people with the genetic disorder Neurofibromatosis 1 (NF1). Scientists from Cincinnati Children's Hospital Medical Center report their findings online Dec. 10 in the Journal of Clinical Investigation. "We can for the first time shrink the large majority of neurofibromas, at least in mice, by using a molecularly targeted treatment," said Nancy Ratner, PhD, principal investigator and program leader for the ...

Bed bugs are not repelled by commercial ultrasonic frequency devices

2012-12-10
Alternative means of controlling urban insect pests by using ultrasonic frequencies are available and marketed to the public. However, few of these devices have been demonstrated as being effective in repelling insect pests such as mosquitoes, cockroaches, or ants. Despite the lack of evidence for the efficacy of such devices, they continue to be sold and new versions targeting bed bugs are readily available. However, according to a soon-to-be-published article in the Journal of Economic Entomology, commercial devices that produce ultrasound frequencies are NOT promising ...

Depression in elderly men linked to higher rates of emergency admissions

2012-12-10
Depressed elderly men have a twofold risk of admission to hospital, found a new study published in CMAJ (Canadian Medical Association Journal). This finding could have potential for helping identify at-risk men to prevent admissions. "Men with depression had a twofold increase in the mean number of hospital admissions, and these lasted on average twice as long as for men without depression," writes Dr. Matthew Prina, Institute of Public Health, Cambridge University, Cambridge, UK, with coauthors. Researchers from Australia, the UK and the Netherlands undertook a study ...

From fish to man: Research reveals how fins became legs

From fish to man: Research reveals how fins became legs
2012-12-10
Vertebrates' transition to living on land, instead of only in water, represented a major event in the history of life. Now, researchers reporting in the December issue of the Cell Press journal Developmental Cell provide new evidence that the development of hands and feet occurred through the gain of new DNA elements that activate particular genes. "First, and foremost, this finding helps us to understand the power that the modification of gene expression has on shaping our bodies," says Dr. José Luis Gómez-Skarmeta of the CSIC-Universidad Pablo de Olavide-Junta de Andalucía, ...

(Antibody) orientation matters

2012-12-10
The orientation of antibody binding to bacteria can mean life or death to the bug, according to a study published in The Journal of Experimental Medicine on December 10th. These findings may help explain why these bacteria cause millions of localized infections, but more serious, systemic blood infections are rare. Streptococcus pyogenes—the causative agent of strep throat—typically invades the body's mucosal surfaces, including the throat and skin. These invasions are kept in check by Y-shaped immune proteins called antibodies, which attach to the bug via their arm ...

To fight incurable metastatic breast cancer, resistance must be broken

2012-12-10
One of the most frustrating truths about cancer is that even when a treatment works, it often doesn’t work for long because cancer cells find ways to resist. However, researchers reporting studies done in mice in the December 11, 2012, issue of Cancer Cell, a Cell Press publication, may have a way to stay one step ahead in the case of aggressive metastatic breast cancer. The findings emphasize the importance of basic cancer biology for advancing treatments that are more effective and less toxic, the researchers say. "We need to gain a better understanding of the wiring ...

Into adulthood, sickle cell patients rely on ER

Into adulthood, sickle cell patients rely on ER
2012-12-10
Patients with sickle cell disease rely more on the emergency room as they move from pediatric to adult health care, according to researchers at Washington University School of Medicine in St. Louis. An analysis of Medicaid data of more than 3,200 patients with sickle cell disease shows that emergency room visits tripled from age 15 to age 24. The research is reported Dec. 10 at the American Society of Hematology's annual meeting, in Atlanta. "There seems to be a breakdown in medical care during the transition from childhood to adulthood," says hematologist Morey A. ...

New studies reveal critical insights to improve care of patients with sickle cell disease

2012-12-10
(ATLANTA, December 10, 2012) – Research unveiling key gaps in continuity of care for sickle cell patients transitioning from pediatric to adult care will be presented this week during the 54th Annual Meeting of the American Society of Hematology (ASH). Sickle cell disease (SCD) is an inherited, chronic blood disorder affecting between 90,000 and 100,000 Americans. Instead of producing healthy red blood cells, individuals with the disease produce abnormal, sickle-shaped cells that cannot easily move through blood vessels and deliver adequate oxygen to the body's tissues ...

Joslin scientists: Brown adipose tissue beneficial for metabolism and glucose tolerance

Joslin scientists: Brown adipose tissue beneficial for metabolism and glucose tolerance
2012-12-10
BOSTON – December 10, 2012 – Joslin Diabetes Center scientists have demonstrated that brown adipose tissue (BAT) has beneficial effects on glucose tolerance, body weight and metabolism. The findings, which may lead to new treatments for diabetes, appear in the upcoming issue of the Journal of Clinical Investigation. Unlike the more prevalent white adipose tissue (WAT or white fat) which stores fat, BAT (or brown fat) burns fat to produce heat. Studies in mice and humans have suggested that BAT also plays a role in regulating body weight and metabolism. This has made ...

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[Press-News.org] Brown fat transplants help mice lose weight