Navigation Links
A scientific breakthrough on the control of the bad cholesterol

Montral, November 24, 2008 A study performed by the team of Dr. Nabil G. Seidah, Director of the Biochemical Neuroendocrinology Research Unit at the IRCM, shows for the very first time that the degradation by PCSK9 of the LDLR receptor, which is responsible for removing the bad cholesterol (LDL-cholesterol) from the bloodstream, may be inhibited by a third protein, annexin A2. This major discovery co-authored by Gatan Mayer, a postdoctoral fellow, Steve Poirier, a doctoral student, and Dr. Seidah was published on November 14 in the Journal of Biological Chemistry (JBC).

Genetic studies on humans have clearly shown that PCSK9 is a prime therapeutic target for the prevention and treatment of cardiovascular diseases. PCSK9 proprotein convertase promotes the degradation of the receptor responsible for eliminating LDL-cholesterol particles. Thus, the presence of PCSK9 leads to a surplus of bad cholesterol in the bloodstream and contributes to plaque formation, leading to blockage of blood vessels and arteries. This phenomenon is a major risk factor that can lead to cardiovascular diseases, such as heart attack, atherosclerosis and stroke. Mutations of human genes have demonstrated that a rise in PCSK9 activity results in a major increase in LDL-cholesterol and familial hypercholesterolemia. Conversely, in people with a non-functional mutation in the gene coding for PCSK9, a decrease in its activity brings down the LDL-cholesterol concentration levels in the bloodstream and diminishes by up to 88% the risks of developing cardiovascular diseases.

"By performing a series of biochemical experiments, we discovered that annexin A2 binds strongly to PCSK9 and inhibits its function," remarks Gatan Mayer, the article's first author. This discovery should pave the way toward the development of a new drug that would lower blood cholesterol to recommended levels. Currently, cholesterol lowering drugs known as "statins" are used by more than 25 million people worldwide. Statins decrease cholesterol synthesis and increase the number of LDL-receptors, thus efficiently decreasing plasma cholesterol levels; however, they also increase the amount of PCSK9, which degrades those receptors, thus reducing the effect of statins. A drug that would block PCSK9 could either be used alone or jointly with statins and would be highly beneficial to patients in whom statins do not work or are unable to take this drug.


Contact: Nabil G. Seidah
Institut de recherches cliniques de Montreal

Related biology news :

1. Barrow scientists solve 200-year-old scientific debate involving visual illusions
2. Scientific community called upon to resolve debate on net energy once and for all
3. Top scientific meeting urges coordinated response to economic and environmental crises
4. Loggerhead release to provide vital information to scientific community
5. NIAID scientists to speak on range of infectious disease topics at major scientific meeting
6. ETH Zurich-administered fund ends scientific anonymity
7. Gene therapy anti-cancer research featured in Scientific American
8. In scientific first, Einstein researchers correct decline in organ function associated with old age
9. The emerging scientific discipline of aeroecology
10. Significant impact factor boost for scientific journal Genome Research
11. Scientific information largely ignored when forming opinions about stem cell research
Post Your Comments:
(Date:11/10/2015)... 10, 2015  In this report, the ... of product, type, application, disease indication, and ... report are consumables, services, software. The type ... biomarkers, efficacy biomarkers, and validation biomarkers. The ... diagnostics development, drug discovery and development, personalized ...
(Date:11/4/2015)... York , November 4, 2015 ... a new market report published by Transparency Market Research "Home ... Growth, Trends and Forecast 2015 - 2022", the global home ... US$ 30.3 bn by 2022. The market is estimated ... forecast period from 2015 to 2022. Rising security needs ...
(Date:10/29/2015)... , Oct. 29, 2015 Daon, a global ... it has released a new version of its ... North America have already installed ... also includes a FIDO UAF certified server component ... preparing to activate FIDO features. These customers include some ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... Worcester, Mass. (PRWEB) , ... November 24, 2015 ... ... need to maintain healthy metabolism. But unless it is bound to proteins, copper ... Institutes of Health (NIH), researchers at Worcester Polytechnic Institute (WPI) will conduct a ...
(Date:11/24/2015)... RALEIGH, N.C. , Nov. 24, 2015  Clintrax Global, Inc., ... Raleigh, North Carolina , today announced that the company has ... earnings represented a 391% quarter on quarter growth posted for Q3 ... Kingdom and Mexico , with the ... place in December 2015. --> United Kingdom ...
(Date:11/24/2015)... Muncie, IN (PRWEB) , ... November 24, 2015 , ... ... its newest Special Interest Group (SIG), MultiGP, also known as Multirotor Grand Prix, to ... in the last few years. Many AMA members have embraced this type of racing ...
(Date:11/24/2015)... 24, 2015  Tikcro Technologies Ltd. (OTCQB: TIKRF) today announced that its ... at 11:00 a.m. Israel time, at the law ... Allon Street, 36 th Floor, Tel Aviv, Israel ... and Izhak Tamir to the Board of Directors; ... directors; , approval of an amendment to certain terms of options ...
Breaking Biology Technology: