Featured Research

from universities, journals, and other organizations

Terminally Ill Rodents With Type 1 Diabetes Restored To Full Health With Single Dose Of Leptin

Date:
August 26, 2008
Source:
UT Southwestern Medical Center
Summary:
Terminally ill rodents with type 1 diabetes have been restored to full health with a single injection of a substance other than insulin by scientists at UT Southwestern Medical Center.

Terminally ill rodents with type 1 diabetes have been restored to full health with a single injection of a substance other than insulin by scientists at UT Southwestern Medical Center.

Since the discovery of insulin in 1922, type 1 diabetes (insulin-dependent diabetes) in humans has been treated by injecting insulin to lower high blood sugar levels and prevent diabetic coma.

New findings by UT Southwestern researchers, which appear online and in a future issue of the Proceedings of the National Academy of Sciences, suggest that insulin isn't the only agent that is effective. Leptin, a hormone produced by the body's fat cells, also lowers blood glucose levels and maintains them in a normal range for extended periods, they found.

"The fact that these animals don't die and are restored to normal health despite a total lack of insulin is hard for many researchers and clinicians to believe," said Dr. Roger Unger, professor of internal medicine and senior author of the study. "Many scientists, including us, thought it would be a waste of time to give leptin in the absence of insulin. We've been brainwashed into thinking that insulin is the only substance that can correct the consequences of insulin deficiency."

The mechanism of leptin's glucose-lowering action appears to involve the suppression of glucagon, a hormone produced by the pancreas that raises glucose levels. Normally, glucagon is released when the glucose, or sugar, level in the blood is low. In insulin deficiency, however, glucagon levels are inappropriately high and cause the liver to release excessive amounts of glucose into the bloodstream. This action is opposed by insulin, which tells the body's cells to remove sugar from the bloodstream.

In type 1 diabetes, which affects about 1 million people in the U.S., the pancreatic islet cells that produce insulin are destroyed. Type 1 diabetics must take insulin multiple times a day to metabolize blood glucose and regiment their diets. In comparison, patients with non-insulin dependent, or type 2, diabetes make insulin, but their bodies don't respond well to it. Type 2 diabetes affects between 18 million and 20 million people in this country.

In the current study, researchers tested for the first time whether a single injection of the leptin gene given to insulin-deficient mice and rats on the verge of death from diabetic coma could reverse the severe condition and prevent the animals from dying. The animals that received the leptin gene began producing excessive amounts of leptin, which reversed all the measurable consequences of type 1 diabetes including weight loss, hyperglycemia and ketoacidosis, a potentially fatal condition that develops when the body doesn't have enough insulin to meet basic metabolic requirements. Much of the effect was mediated by complete suppression of the high glucagon levels, said Dr. Xinxin Yu, assistant instructor of internal medicine and lead author of the study.

"These animals were actually dying," Dr. Yu said. "But if we gave them the leptin gene, within two weeks, the terminally ill rodents were restored to full health without any other treatment."

Dr. Unger said it's too premature to know whether leptin might someday replace insulin as a treatment for diabetic patients, but this study demonstrates that leptin could at least handle some of insulin's job requirements and do it for longer periods of time. Injected insulin is biologically active for only three to four hours.

"My hope is that you could give leptin for one type of action – glucagon's suppression, for example – and insulin for another. Or perhaps give a substance other than insulin entirely," Dr. Unger said. "What would be a tremendous advance would be the ability to give an oral agent that suppresses glucagon without injections."

Dr. Yu said the research team hypothesizes that leptin combats diabetes not only be suppressing glucagon's action on the liver, but also by boosting the insulin-like actions of IGF-1 (insulin-like growth factor-1), a hormone that promotes growth and mimics insulin.

"One of the things that happens when a child gets type 1 diabetes is their growth is stunted until they're given insulin," Dr. Unger said. "The same is true with these mice. However, we found that if you take a diabetic rat that's not receiving insulin and make it hyperleptinemic, it almost catches up growthwise."

While the treated animals' blood glucose levels inched back up over time, their hyperglycemia (high blood sugar) consistently remained well below the elevated pre-treatment levels. The untreated rodents, on the other hand, died within two or three days. The researchers tracked the treated rodents for 25 weeks.

The next step is to study other potential glucagon suppressants and begin leptin clinical trials within the next year.

Other UT Southwestern researchers involved in the study were Dr. May-Yun Wang, assistant professor of internal medicine; Dr. Zhao Wang, postdoctoral researcher in internal medicine; and former postdoctoral fellow Dr. Byung-Hyun Park.

The work was supported by the National Institute of Diabetes and Digestive and Kidney Diseases, the Department of Veterans Affairs, and the Juvenile Diabetes Research Foundation.


Story Source:

The above story is based on materials provided by UT Southwestern Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

UT Southwestern Medical Center. "Terminally Ill Rodents With Type 1 Diabetes Restored To Full Health With Single Dose Of Leptin." ScienceDaily. ScienceDaily, 26 August 2008. <www.sciencedaily.com/releases/2008/08/080825175043.htm>.
UT Southwestern Medical Center. (2008, August 26). Terminally Ill Rodents With Type 1 Diabetes Restored To Full Health With Single Dose Of Leptin. ScienceDaily. Retrieved October 2, 2014 from www.sciencedaily.com/releases/2008/08/080825175043.htm
UT Southwestern Medical Center. "Terminally Ill Rodents With Type 1 Diabetes Restored To Full Health With Single Dose Of Leptin." ScienceDaily. www.sciencedaily.com/releases/2008/08/080825175043.htm (accessed October 2, 2014).

Share This



More Health & Medicine News

Thursday, October 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Pregnancy Spacing Could Have Big Impact On Autism Risks

Pregnancy Spacing Could Have Big Impact On Autism Risks

Newsy (Oct. 1, 2014) A new study says children born less than one year and more than five years after a sibling can have an increased risk for autism. Video provided by Newsy
Powered by NewsLook.com
Robotic Hair Restoration

Robotic Hair Restoration

Ivanhoe (Oct. 1, 2014) A new robotic procedure is changing the way we transplant hair. The ARTAS robot leaves no linear scarring and provides more natural results. Video provided by Ivanhoe
Powered by NewsLook.com
Insertable Cardiac Monitor

Insertable Cardiac Monitor

Ivanhoe (Oct. 1, 2014) A heart monitor the size of a paperclip that can save your life. The “Reveal Linq” allows a doctor to monitor patients with A-Fib on a continuous basis for up to 3 years! Video provided by Ivanhoe
Powered by NewsLook.com
Attacking Superbugs

Attacking Superbugs

Ivanhoe (Oct. 1, 2014) Two weapons hospitals can use to attack superbugs. Scientists in Ireland created a new gel resistant to superbugs, and a robot that can disinfect a room in minutes. Video provided by Ivanhoe
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins