|
|
|
|
|
26nd Safarul Muzaffer 1436 | Monday, Dec 22, 2014
Health

Protein missing in fat tissue `favours bad over good fat`

Saturday, 5 January 2013
Comments(0)
Washington, January 05:

Something more than overeating and a lack of exercise causes the body to store more fat and burn less energy – a protein called p62, researchers have claimed.

These findings indicate that p62 might make a promising target for new therapies aimed at curbing obesity.

“Without p62 you’re making lots of fat but not burning energy, and the body thinks it needs to store energy,” Jorge Moscat, lead author of the study, said.

“It’s a double whammy,” he said.

Moscat, who led the study with collaborators at Helmholtz Zentrum Munchen in Germany and the University of Cincinnati, had previously produced mice that completely lack the p62 protein everywhere in their bodies. As a result, the animals were obese.

They also had metabolic syndrome. In other words, as compared to mice with p62, mice lacking p62 weighed more, expended less energy, had diabetes and had a hyper-inflammatory response that’s characteristic of obesity.

While those results showed that the lack of p62 leads to obesity, “we didn’t know which tissue was responsible for these effects, because p62 was missing in all of them,” Moscat said.

Some researchers believe that muscle tissue, where energy is expended, controls obesity. Others suspect the liver is a key player, or that the brain’s appetite control centre is most responsible for obesity.

But then there’s fat itself—both white fat and brown fat. White fat is the type we think of as unwanted body fat. Brown fat, on the other hand, is beneficial because it burns calories. Many researchers now believe that brown fat somehow malfunctions in obesity, but the details are unclear.

In their latest study, Moscat and colleagues set out to pinpoint the specific tissue responsible for obesity when p62 is missing. They made several different mouse models, each missing p62 in just one specific organ system, such as the central nervous system, the liver, or muscle. In every case, the mice were normal. They weren’t obese like the mice lacking p62 everywhere.

Then they made a mouse model lacking p62 only in their fat tissue. These mice were obese, just like the mice missing p62 in all tissues. Upon further study, the researchers found that p62 blocks the action of an enzyme called ERK while activating another enzyme called p38.

When p62 is missing, the enzyme p38 is less active in brown fat, while ERK is more active in white fat. As a result, Moscat said, p62 is “a master regulator” in normal fat metabolism.

According to Moscat, the discovery of p62’s role in brown fat tissue is encouraging, because fat tissue is much more accessible than other parts of the body—the brain, for example—for potential drug therapies.

“This makes it easier to think about new strategies to control obesity,” he added.

The study has been published in the Journal of Clinical Investigation.

ANI

Latest News

In a record high, foreign investors have purchased Indian debt securities worth USD 19 billion this ...

Nothing wrong with reverse conversions, says Sena

Shiv Sena today said that there's nothing wrong with reverse conversions and flayed "those who kept ...

Ex-Army chief V K Singh blamed for Mumbai's Adarsh housing row

Members of scam-hit Adarsh Housing Society today accused former Army chief V K Singh of being respon ...

Related News

Bird flu alert in UP: import of poultry products banned

Following reports of a bird flu case in Chandigarh, Uttar Pradesh banned the import of chicken, eggs ...

Compulsive habits may be product of brain running amuck

A new study has revealed that misfiring of the brain's habit control system may be behind the compul ...

My appetite for chess has recovered: Vishwanathan Anand

Buoyed by winning the London Chess Classic, five-time world chess champion Vishwanathan Anand here o ...

Post new comment

To combat spam, please enter the code in the image.

Rs. 26640 (Per 10g)

Opinion Poll
Do you think Lakhvi's re-arrest is a drama by Pak to keep India's mouth shut?
YesNoCan't say

Matrimony | Photos | Videos | Search | Polls | Archives | Advertise | Letters

© The Siasat Daily, 2012. All rights reserved.
Jawaharlal Nehru Road, Abids, Hyderabad - 500001, Telangana, India
Tel: +91-40-24744180, Fax: +91-40-24603188
contact@siasat.com