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PDT kills drug-resistant bacteria, fungus in lab tests

Photodynamic therapy may be an effective treatment for fungal infections and certain bacterial infections of the oral cavity, including some that are resistant to antibiotics, research from the University at Buffalo's School of Dental Medicine has shown.

Researchers found that the bacteria S. mutans, as well as fungal organisms of the genus Candida, cultured from HIV patients, were highly susceptible to killing with minimal doses of PDT, both in laboratory dishes and on biofilms grown on denture material.

Results of the research were presented today (March 10, 2006) at the International Association of Dental Research meeting in Orlando, Fla.

"The results of the studies so far, while not completed, may have important implications in the treatment of oral infectious diseases currently confounding the medical and dental community," said Thomas S. Mang, Ph.D., associate professor of oral and maxillofacial surgery and senior author on the study.

"PDT may provide an adjunct to current antibiotic treatment or an alternative where antibiotics no longer are working. This may be vital for patients undergoing cancer therapy, HIV patients who demonstrate resistance to antibiotics and the elderly with persistent oral infections."

Photodynamic therapy is based on the propensity of certain types of cells or organisms to absorb light-sensitive drugs. This selective retention allows researchers to direct a laser beam into the organism, which activates the drug and kills the organism but does not damage surrounding tissue.

PDT has been shown to be effective against certain types of cancer, particularly Kaposi's sarcoma, cancer of the esophagus and breast cancer that has metastasized to the chest wall. The drug Photofrin has been approved by the FDA as a sensitizer for PDT in the treatment of early and late stage endobronchial and esophageal cancers, as well as high-grade abnormal tissues associated with Barrett's esophagus, a p
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Contact: Lois Baker
ljbaker@buffalo.edu
716-645-5000 x1417
University at Buffalo
10-Mar-2006


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