Navigation Links
Successful Islet Cell Transplant in Mice With Type 1 Diabetes

Researchers have determined a way to pre-screen cancer patients to see if they are suitable candidates for proteasome inhibitors, a promising class of anti-cancer drugs// . They propose to test for p53, a well-known tumor-suppressor protein that is broken down by cellular machinery called proteasomes.

In cancer patients whose tumors do not produce p53, proteasome inhibitors might be ineffective. This patient group could be spared unnecessary treatment with possible harmful side effects. On the other hand, proteasome inhibitors are highly effective against lymphomas that do have the ability to produce p53.

“Proteasomes resemble paper shredders – they break down proteins such as p53 into smaller pieces,” says senior author Andrei Thomas-Tikhonenko, PhD, Associate Professor of Pathology. “A proteosome inhibitor effectively jams the shredder so that p53 is not immediately broken down.”

In this study, the research team used a mutant strain of mice in which p53 activity can be switched on and off. “In principle, tumors in these mice could be obliterated by turning p53 back on,” says Thomas-Tikhonenko. “The problem was that a protein called MDM2 sent p53 into the teeth of the proteasome shredder.” The proteasome inhibitor bortezomib (Velcade?) causes this jamming process and restores p53 function. However, if p53 was inactivated in the mice, bortezomib treatment failed to kill tumors. Similar effects were seen with cell lines derived from human Burkitt’s lymphomas. When implanted into mice, these lymphoma cells were highly sensitive to the proteasome inhibitor, but as soon as p53 was removed, the inhibitor had no effect.

“These findings have important implications for clinical practice,” Thomas-Tikhonenko adds. “Bortezomib is approved by the Food and Drug Administration for the treatment of multiple myeloma, another cancer of lymphoid cells. Yet, only a fraction of multiple myeloma patients respond to the drug.”

The researchers speculate that responsive myelomas are the ones retaining the p53 protein, which gets stabilized during treatment and triggers self-destruction of cancerous cells. “If confirmed experimentally, our hypothesis will serve to pre-select patients with the best chances of success – those with p53 – and spare the rest – those without p53 – the severe side effects of bortezomib therapy,” explains Thomas-Tikhonenko.

There are two ways, suggest the researchers, to test for p53 production in cancer patients. First, if MDM2 is expressed at abnormally high levels, it is a good indicator that p53 is constantly being made. Second, genetic tests can also be conducted to see if the malignant cells still have the gene for p53 or if the portion of the chromosome on which p53 is found has been deleted.

Sourc-Newswise
SRM
'"/>




Related medicine news :

1. Plastic Sling Has Proved Successful In Improving Aging Of The Neck
2. Successful creation of human embryos from a single parent for the first time
3. French Doctors Successfully Separate Twins Joined At Spine
4. Alzheimer’s disease trial With EVT 101 For Successfully Complete
5. Overweight Briton Underwent Successful Surgery In India Being Denied By NHS
6. First Ever Face Transplant In China Successfully Performed
7. Third Arm Removed Successfully
8. Pancreatic Cancer Surgery Successful in 80-Year-Olds
9. Australian Surgeons Successfully Conduct Worlds First Triple Organ Transplant
10. Mental Health Providers Can Be Successfully Located With Pediatricians
11. Anti-Obesity Vaccine Successful In Rats
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/27/2016)... Columbia, SC (PRWEB) , ... May 27, 2016 , ... ... launched a line of classic American timber frame barn kits, which can be found ... are inspired by historic American barn plans, and they highlight the craftsmanship of ...
(Date:5/27/2016)... ... May 27, 2016 , ... With over 60 percent of acute stroke survivors ... sustainable product to aid in the rehabilitation process has steadily increased. Ekso Bionics had ... with hemiplegia due to stroke. , Ekso Bionics has now received clearance from the ...
(Date:5/27/2016)... Killeen, Texas (PRWEB) , ... May 27, 2016 , ... ... with satisfying Army body fat composition regulations. This is the first time that ... are normally screened at least every six months to ensure they meet the prescribed ...
(Date:5/27/2016)... (PRWEB) , ... May 27, 2016 , ... ... trusted name in the pharmaceutical, medical and food industries. Aside from its GMP ... certification (SIC), providing proof of successfully certified products, services and staff. , Validation ...
(Date:5/26/2016)... ... 26, 2016 , ... Cabot Corporation, Pfizer, and 3M are ... court documents and SEC filings. A jury has returned a verdict of ... Corporation, Case No. BC588866, Los Angeles County, California. The jury awarded $22.8 million ...
Breaking Medicine News(10 mins):
(Date:5/24/2016)... May 24, 2016  Diana Russell suffers from a ... from the inside out.  This disease has put her ... her children and grandchildren to leave her home.  Because ... family cannot haul the wheelchair.  So if there is ... and Diana is left to wait for the bus. ...
(Date:5/24/2016)... LAWRENCE, Mass. , May 24, 2016  NxStage ... medical technology company focused on advancing renal care, today ... Officer, plans to participate in the following schedule of ... will be made available at http://ir.nxstage.com/ . ... Jefferies Healthcare Conference NY, NY           Friday, ...
(Date:5/24/2016)... 2016  Joe Marziani has joined VMS BioMarketing as senior vice president of sales, ... his new role, Marziani will lead the company,s business development and sales team, exploring ... Photo - http://photos.prnewswire.com/prnh/20160523/371089 ... ... ...
Breaking Medicine Technology: