Total Joint Replacement Patients may be Helped by New Vaccine

by Kathy Jones on  February 18, 2012 at 5:43 PM Research News   - G J E 4
Previous research has shown that methicillin resistant staph aureus (MRSA) infections are antibiotic-resistant and can cause innumerable problems like bone erosion, or osteomyelitis.
 Total Joint Replacement Patients may be Helped by New Vaccine
Total Joint Replacement Patients may be Helped by New Vaccine

The latter can curtail the effective life of an implant and significantly hampers replacement of that implant. MRSA can result in prolonged disability, amputation and even death.

Although only 2 percent of the American population that undergo total joint replacement surgery will suffer an infection, half of those infections are from MRSA.

The results of a MRSA infection after a total joint replacement can be devastating.

Currently, there is no effective treatment for MRSA-infected implants. With the increasing incidence of total joint replacement surgeries, the prevalence of MRSA-infected implants is expected to rise.

A team of investigators from the University of Rochester Medical Center has developed a vaccine that can prevent bacterial infection of orthopaedic implants.

The team, led by Edward Schwarz, PhD, Professor of Orthopaedics and Associate Director of the Center for Musculoskeletal Research, has generated an antibody that prevents MRSA bacteria from dividing properly.

"What makes the staph such a challenging pathogen is that is has an ironclad cell wall. But that is also its Achilles' heel," Dr. Schwarz said.

He explained that if the cell wants to divide, it has to "unzip the cell wall" to break into two "daughter cells." Their team produced an antibody that targets a component of the zipper, Gmd-preventing normal bacterial cell division by causing them to form clusters of cells.

The researchers tested the antibody prior to implantation of a MRSA-infected pin to simulate an infected joint replacement. They monitored bacterial growth and found that their antibody protected 50 percent of their sample from infection.

Further analysis found that the antibody prevented formation of sequestrum, or a piece of dead bone, which is a hallmark of osteomyelitis. Additionally, immunization led to decreased bacterial presence on the pins themselves.

Based on these findings, this immunization appears to be a promising treatment to prevent the MRSA infection/reinfection of orthopaedic implants.

Source: ANI

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