Navigation Links
Blood-clotting protein modified for people with hard-to-treat hemophilia
Date:5/19/2008

Pathologists at The University of Texas Health Science Center at Houston have developed a chemically modified protein that may help people with a hard-to-treat form of a genetic bleeding disorder known as Hemophilia A. The discovery and the results of pre-clinical tests appear in the May 2 issue of the Journal of Biological Chemistry.

With a shortage of the blood-clotting protein Factor VIII (FVIII), people with Hemophilia A typically receive injections of FVIII derived from plasma or produced synthetically to control potentially life-threatening episodes of bleeding. Unfortunately as many as 1 in 3 people with Hemophilia A produce inhibitor antibodies, which attack the externally-administered FVIII and negate its blood-clotting benefits.

To combat this problem, scientists in the laboratory of Sudhir Paul, Ph.D., at The University of Texas Medical School at Houston, developed a chemically modified version of FVIII which during laboratory tests neutralized these inhibitor antibodies, thus paving the way for the correction of the blood-coagulating process. The modification is called electrophilic FVIII analog (E-FVIII).

Its a two-step process, said Paul, the senior author. The E-FVIII permanently inactivates the antibodies that inhibit blood clotting in 20 to 30 percent of patients receiving Factor VIII replacement therapy. Once the antibodies are cleared, additional FVIII can be injected. The study involved blood donated by eight people with FVIII-resistant Hemophilia A.

Today, people with FVIII-resistant Hemophilia A have limited treatment options, said co-author Keri Smith, Ph.D., an assistant professor of pathology and laboratory medicine at the UT Medical School at Houston. Those options include bypass therapy or multiple FVIII injections. Both are prohibitively expensive and often ineffective to meet emergency blood-clotting needs.

E-FVIII might provide a more economically feasible method of treating inhibitor antibodies, Smith said.

There is no cure for Hemophilia A, and it primarily affects males. About one of every 7,000 males born in the United States has this condition. A person with hemophilia bleeds longer than a person without hemophilia.

Stephanie Planque, who is lead author and is working towards her Ph.D. degree, helped conceive the chemical inactivation principle behind the study. The modified FVIII analog was produced by pathology faculty Hiroaki Taguchi, Ph.D., and Yasuhiro Nishiyama, Ph.D., using newly developed synthesis methods. Miguel Escobar, M.D., of the department of pediatrics and internal medicine at the UT Medical School at Houston and the Gulf States Hemophilia and Thrombophilia Center, led the clinical aspects of the work, and Kathleen Pratt, Ph.D., at the Puget Sound Blood Center and Division of Hematology, University of Washington, Seattle, contributed a genetically-produced protein that helped the study reach its conclusions.

According to Paul, the next step involves clinical trials. E-FVIII is a first generation reagent. Future genetic and chemical manipulations may help develop improved E-FVIII analogs, Paul wrote in the paper.


'/>"/>

Contact: Robert Cahill
Robert.Cahill@uth.tmc.edu
713-500-3030
University of Texas Health Science Center at Houston
Source:Eurekalert

Related medicine news :

1. Draining away brains toxic protein to stop Alzheimers
2. Penn study finds pro-death proteins required to regulate healthy immune function
3. New prion protein discovered by Canadian scientists may offer insight into mad cow disease
4. Emory researchers identify signaling protein for multiple myeloma
5. Human C-reactive protein regulates myeloma tumor cell growth and survival
6. Lowering Blood Protein Wont Help Kidney Patients
7. Blood protein detects lung cancer, even at earliest stage
8. Natural Protein Could Help Spot, Treat Liver Cancer
9. Heat shock proteins are co-opted for cancer
10. How adhesive protein causes malaria
11. Loss of gene leads to protein splicing and buildup of toxic proteins in neurons
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... The Visiting Nurse Association ... Featuring a collection of specialty vendors and unique items from across the nation, this ... health and wellness services offered by the VNA. The boutique will be open ...
(Date:10/13/2017)... ... October 13, 2017 , ... Coveros, ... Development, has been awarded a contract by the Center for Medicare and Medicaid ... to accelerate the enterprise use of Agile methodologies in a consistent and high ...
(Date:10/12/2017)... ... 2017 , ... Planet Fitness, one of the largest and fastest growing franchisors ... a flagship location in Covington, LA at 401 N. U.S. Highway 190, in January ... Office Depot in the Holiday Square shopping center. Its location allows it to serve ...
(Date:10/12/2017)... ... October 12, 2017 , ... Information ... we intend to develop to enable prevention of a major side effect of ... loss, especially in pediatric patients. For cisplatin, hearing loss is FDA listed on-label ...
(Date:10/12/2017)... ... 12, 2017 , ... Women-owned and Grand Rapids-based workplace wellness ... in Wellness® by Best and Brightest. OnSite Wellness will be honored at the ... 7:30 a.m. to 2 p.m. at the Henry Autograph Collection Hotel, located at ...
Breaking Medicine News(10 mins):
(Date:10/10/2017)... EXTON, Pa. , Oct. 10, 2017   ... leader in innovative solutions for injectable drug administration, today ... of West,s ID Adapter for improving the intradermal administration ... the Fourth Skin Vaccination Summit in May 2017 by ... Team Lead, Polio Department, World Health Organization (WHO), and ...
(Date:10/5/2017)...  In response to the nationwide opioid epidemic, ... (AAOMS) released prescribing recommendations that urge ibuprofen – ... a first-line therapy to manage a patient,s acute ... Recognizing the value and importance of the ... Acute and Postoperative Pain Management" stresses that practitioners ...
(Date:10/4/2017)...  According to the Centers for Disease Control and Prevention (CDC), ... Urgent Care is helping communities across Massachusetts , ... offering no-cost* flu shots through the end of the month. ... regulations. ... a flu shot is by the end of October, according to the ...
Breaking Medicine Technology: