Navigation Links
Researchers identify new brain pathway for regulating weight and bone mass
Date:9/23/2009

Contrary to the prevailing view, the hormone leptin, which is critical for normal food intake and metabolism, appears to regulate bone mass and suppress appetite by acting mainly through serotonin pathways in the brain, according to a recent study published in Cell by Yale School of Medicine researchers and colleagues at Columbia University. This new finding contradicts the view that leptin acts primarily in the hypothalamus.

"Our study challenges the view that the hypothalamus is the critical brain site where leptin acts directly to alter neuronal circuit function to suppress appetite and bone metabolism," said Yale researcher and study co-author Tamas Horvath. "We've now found a novel explanation for how leptin can act on the brain." Horvath is chair and professor of comparative medicine and professor of neurobiology and obstetrics & gynecology at Yale School of Medicine.

Food intake is influenced by signals that travel from the body to the brain. Leptin is one of the molecules that signal the brain to modulate food intake. It is produced in fat cells and informs the brain of the metabolic state. If animals are missing leptin, or the leptin receptor, they eat too much and become severely obese.

To determine whether leptin regulates bone mass through serotonin pathways, Horvath and his colleagues analyzed multiple lines of mice that were genetically altered to remove serotonin in the brain. "We found that when the serotonin pathway is turned off by leptin, the mice ate less, lost weight and their bones became weak. When the pathway is turned on, the mice ate more, gained weight and had more bone mass," said Horvath. "This might be why obese people tend to have much lower incidences of osteoporosis."

The study was designed by Gerard Karsenty of Columbia University as a follow-up to his groundbreaking work on the relationship between leptin and bone metabolism. Yale researchers provided a neurobiological framework for the study.

"This study modifies the map of leptin signaling in the brain and identifies a molecular basis for the common regulation of bone and energy metabolisms," said Horvath, who is also director of the recently established Program on Cell and Neurobiology of Energy Metabolism at Yale.


'/>"/>

Contact: Karen N. Peart
karen.peart@yale.edu
203-432-1326
Yale University
Source:Eurekalert

Related biology news :

1. Researchers identify proteins involved in new neurodegenerative syndrome
2. Texas researchers and educators head for Antarctica
3. MGH researchers describe new way to identify, evolve novel enzymes
4. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
5. U of MN researchers discover noninvasive diagnostic tool for brain diseases
6. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
7. Researchers discover new strategies for antibiotic resistance
8. Researchers find new taste in fruit flies: carbonated water
9. Binghamton University researchers investigate evolving malaria resistance
10. UIC researchers find promising new targets for antibiotics
11. Researchers develop simple method to create natural drug products
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/4/2017)... YORK , April 4, 2017   EyeLock ... today announced that the United States Patent and Trademark ... patent broadly covers the linking of an iris image ... same transaction) and represents the company,s 45 th ... latest patent is very timely given the multi-modal biometric ...
(Date:3/30/2017)... 2017  On April 6-7, 2017, Sequencing.com will host ... hackathon at Microsoft,s headquarters in Redmond, ... on developing health and wellness apps that provide a ... Genome is the first hackathon for personal genomics ... companies in the genomics, tech and health industries are ...
(Date:3/30/2017)... March 30, 2017 Trends, opportunities and forecast ... behavioral), by technology (fingerprint, AFIS, iris recognition, facial recognition, ... others), by end use industry (government and law enforcement, ... and banking, and others), and by region ( ... Asia Pacific , and the Rest ...
Breaking Biology News(10 mins):
(Date:4/21/2017)... ... April 21, 2017 , ... ... nourishing a range of emerging technology-based businesses, recently earned a $77,518 grant from ... , Founded in 2004, FITCI is Frederick’s first incubator. A non-profit corporation, ...
(Date:4/20/2017)... ... April 20, 2017 , ... Husson ... clinical research community’s growing body of knowledge during its Eighth Annual Research ... and the adjacent Darling Atrium. During the event, undergraduates, graduate students, and faculty ...
(Date:4/20/2017)... ... April 20, 2017 , ... ... unique intellectual property (IP) sharing and commercialization model. , The Center for Advancing ... main component of this effort is bringing the IP to the attention of ...
(Date:4/19/2017)... ... April 18, 2017 , ... A number of new instruments have ... is part of the Protein and Cell Analysis Education Webinar Series , will ... technology fits in current and future applications. , Many flow cytometers have unique ...
Breaking Biology Technology: