HOME >> MEDICINE >> NEWS
Scientists identify key mechanism in estrogen's role in preventing bone loss

Scientists have uncovered a significant new link in the chain of immune system events through which estrogen prevents bone loss and that contribute to bone loss when estrogen is deficient. Through research in mice, the scientists discovered that an immune signaling molecule called type b transforming growth factor (TGFb) is responsible for a cascade of events that leads estrogen to prevent bone loss. When TGFb signaling in T cells is blocked, the bone-sparing effects of estrogen are lost. The findings could lead to new therapeutic approaches for preventing bone loss. Results of the research were published online in the Proceedings of the National Academy of Sciences the week of October 25.

The study's senior author was Roberto Pacifici, MD, Herndon professor of medicine and director of the Division of Endocrinology at Emory University School of Medicine. Lead author was Emory research associate Yuhao Gao, PhD.

Previous research has shown that bone loss due to estrogen deficiency is caused by the overexpansion of immune T cells. T cells are known to produce a protein called tumor necrosis factor (TNF), which increases the formation of osteoclasts in rodents and humans. Osteoclasts are cells that help cause the absorption and removal of bone.

In research published in PNAS in August 2003, Dr. Pacifici and his colleagues demonstrated that estrogen deficiency leads to the expression of the immune regulatory protein interferon gamma (IFN-g), which in turn stimulates a protein called class II transactivator (CIITA). They found that increased expression of CIITA leads to expanded antigen presentation by macrophages (immune cells that alert T cells to the presence of invading organisms) and in turn to enhanced T cell activation in the bone marrow and extended T-cell lifespan.

The investigators' new research traces another step in the "upstream" pathway leading to estrogen's effect on bone. In order to model postmenopausal estroge
'"/>

Contact: Holly Korschun
hkorsch@emory.edu
404-727-3990
Emory University Health Sciences Center
28-Oct-2004


Page: 1 2

Related medicine news :

1. Scientists replicate hepatitis C virus in laboratory
2. Scientists identify brain regions that decide where we look
3. Scientists uncover new mechanism for the amygdala in fear recognition
4. Scientists identify protein critical to melanoma growth
5. Scientists discover recipe for life: eating the Polymeal cuts heart disease by 76%
6. Scientists study fish oil diet in bid to cut heart attack risks
7. Scientists discover enzyme crucial to the transportation of proteins within cells
8. Scientists turn on the gender lens on cardiovascular disease research
9. Scientists stalk PPAR-gamma, find novel cancer connection
10. Scientists align billion-year-old protein with embryonic heart defects
11. Scientists pinpoint flaw, offer new promise for stroke treatment

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/2/2016)... Las Vegas, NV (PRWEB) , ... May 02, ... ... with Specialty Pharmacy Times, has announced a new Specialty Pharmacy Patient Satisfaction Award ... be determined based on the quarterly results from Zitter Health Insights’ Specialty Pharmacy ...
(Date:5/2/2016)... ... 02, 2016 , ... The 2016 World Ultimate & Guts Championship (WUGC) Mixed roster was announced ... the cut. The WUGC is being held in London, England this year from June 18-25. ... men’s division, another gold in the women’s masters division, and a silver in the women’s ...
(Date:5/2/2016)... ... May 02, 2016 , ... Pregnancy Awareness Month offers a great time to ... , “If you are ready to have a baby, it’s best to get started ... Babies is your Personal Conception & Pregnancy Organizer, written for women who plan on ...
(Date:5/2/2016)... MO (PRWEB) , ... May 02, 2016 , ... ... a division of Permobil, recently completed two groundbreaking studies that determined that the ... mattresses – are critical in the prevention of pressure injuries, which are now ...
(Date:5/2/2016)... ... May 02, 2016 , ... Atlantic Information Services, Inc. (AIS) ... B Payment Model Could Transform the Pharma Landscape .” CMS recently proposed a test ... spend on provider-administered drugs while preserving care provided to beneficiaries. The webinar will review ...
Breaking Medicine News(10 mins):
(Date:4/28/2016)... FREMONT, Calif. , April 28, 2016 ... Enterprise Validation Lifecycle Management Solutions (VLMS) today ... products and services for sufferers of chronic ... management System to manage their corporate validation ... been seeking a software solution to manage ...
(Date:4/27/2016)... Mass., April 27, 2016  Hologic, Inc. (Nasdaq: ... financial results for the fiscal second quarter ended ... (EPS) of $0.24 increased 41.2%, and non-GAAP diluted ... million increased 5.8% on a reported basis, and ... "We posted another good quarter, highlighted by ...
(Date:4/27/2016)... --   , Total Sales ... Sales  Clinical sales grow 16% year-over-year  , ... OTCQX: MKEAY) inventor of Cellvizio®, the multidisciplinary confocal laser ... quarter ended March 31, 2016 and provided an update ... strategy. First Quarter 2016 Revenue Results by ...
Breaking Medicine Technology:
Cached News: