Professor of Microbiology/Immunology and Medicine
Bacterial Pathogenesis; Infectious Disease; Microbial Pathogenesis; Microbiology
My research interests focus on bacterial pathogenesis, emphasizing bacterial biofilms, antimicrobial therapies and vaccine antigens. One major area of my research lab is otitis media (OM) or middle ear disease. Approximately 80 percent of children experience one episode of OM while others have recurrent infections. Chronic OM infection causes hearing impairment leading to developmental problems as these children reach school age. My laboratory has concentrated on two major causes of OM, Moraxella catarrhalis and Streptococcus pneumoniae. Our recent work suggests that M. catarrhalis colonization predisposes patients to colonization with S. pneumoniae in polymicrobial biofilms. The goals of this work are to define biofilm-associated factors and to identify signals that induce bacteria to transition from asymptomatic colonizers to pathogenic organisms leading to OM.
Our second major research focus is the identification of novel antimicrobial therapies. Chronic OM is likely a biofilm-associated disease and biofilms are highly antibiotic resistant. Antibiotic resistance is a major problem worldwide and new drug development is both time consuming and extremely expensive. We have demonstrated that photodynamic therapy (PDT), an FDA-approved cancer treatment, is also bactericidal against the three major otopathogens. Thus, the goal of this research is to adapt PDT into a clinically effective treatment for chronic OM.
Our third research area involves novel antimicrobial treatments for orthopedic/prosthetic infections. Infections after orthopedic intervention, including knee/hip replacements and insertion of prosthetic devices, are devastating to the patient and these infections will likely increase over the next 20 years. This is particularly relevant to the military where improvised explosive devices cause severe extremity injuries requiring amputation. Antibiotic-resistant biofilms are the primary source of these infections. In collaboration with colleagues at UB, we are testing a novel electrical stimulation method for prevention/eradication of biofilm infections on implant materials. The goals of this research are to define the optimal antimicrobial parameters that are broadly effective against multiple pathogens, including Staphylococcus aureus, Acinetobacter baumannii, Staphylococcus epidermidis and Klebsiella pneumoniae.
The members of my research team typically include a combination of graduate students, lab technicians and a junior faculty member. In the summer, I usually mentor medical students or undergraduates who are interested in the fundamentals of basic science and translational research focused on microbial pathogenesis.