Navigation Links
Leptin's long-distance call to the pancreas
Date:12/22/2008

Rube Goldbergthe cartoonist who devised complex machines for simple taskswould have smiled at one of leptin's mechanisms for curbing insulin release. As Hinoi et al. show, the fat-derived hormone enlists the sympathetic nervous system to prevent bone-making cells from releasing a molecule that prods the pancreas to discharge insulin.

The study will appear online December 22, 2008 (www.jcb.org) and in the December 29, 2008 print issue of The Journal of Cell Biology (JCB).

In the fight against obesity and diabetes, leptin is one of the good guys. Mice lacking the hormone become corpulent, and their sky-high insulin levels eventually lead to diabetes. Leptin can curtail insulin release directly. But there's also a back-door route that researchers are still trying to piece together. Scientists knew that leptin nudges osteoblasts, cells known for building bone but that also manufacture osteocalcin, a protein that stimulates insulin release. Hinoi et al. tested whether leptin acts on the pancreas through osteocalcin.

Leptin channels many of its effects through the nervous system. The team thus tested whether the hormone relied on the sympathetic nervous system, the branch that pumps out adrenaline during emergencies but at other times emits a hormonal trickle to maintain a low level of stimulation. This baseline activity was lower in mice lacking the leptin receptor, indicating a connection between leptin and the sympathetic nervous system. When that connection was broken by deleting the adrenaline receptor from mice osteoblasts, insulin levels shot up.

The researchers then dosed mice with a sympathetic stimulator. Rodents lacking leptin or the adrenaline receptor on their osteoblasts turned out normal amounts of osteocalcin, but much of it was in an inert form. That result suggests leptin affects insulin release by indirectly inactivating osteocalcin. The work boosts researchers' hopes of using osteocalcin to treat diabetesa possibility some drug companies have already started to investigate.


'/>"/>

Contact: Rita Sullivan
rsullivan@rockefeller.edu
212-327-8603
Rockefeller University Press
Source:Eurekalert  

Related biology news :

1. Jefferson Department of Surgery announces new pancreas tumor registry
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Leptin's long-distance call to the pancreas
(Date:6/23/2017)... and ITHACA, N.Y. , June ... Cornell University, a leader in dairy research, today announced ... designed to help reduce the chances that the global ... onset of this dairy project, Cornell University has become ... Sequencing the Food Supply Chain, a food safety initiative ...
(Date:5/23/2017)... 2017  Hunova, the first robotic gym for the rehabilitation and functional ... in Genoa, Italy . The first 30 robots will ... USA . The technology was developed and patented at ... IIT spin-off Movendo Technology thanks to a 10 million euro investment from ... click: ...
(Date:5/16/2017)... 16, 2017   Bridge Patient Portal , ... MD EMR Systems , an electronic medical ... GE, have established a partnership to build an ... the GE Centricity™ products, including Centricity Practice Solution ... These new integrations will allow healthcare delivery ...
Breaking Biology News(10 mins):
(Date:7/17/2017)... ... July 17, 2017 , ... ... solutions, today announced safety software company AB Cube has joined its ... segment to advance technology innovation across life sciences and healthcare. Under the ...
(Date:7/17/2017)... ... , ... Panitch Schwarze Belisario & Nadel intellectual ... Innovation Group) annual meeting in China. , This year’s meeting, held June 9-10 ... a rapidly developing highly personalized anti-cancer technology that involves removing some of a ...
(Date:7/16/2017)... ... July 16, 2017 , ... OHAUS Corporation, ... the launch of its new line of Rocking and Waving Shakers today. , ... models (both analog and digital) for laboratory applications in a variety of environmental ...
(Date:7/14/2017)... ... July 14, 2017 , ... Sonic Manufacturing Technologies is proud ... installed a solar system on its roof top. “We will be independent of ... Kenneth Raab stated. The company’s proud history of social responsibility and participation in ...
Breaking Biology Technology: