“A popular drug that targets allergy symptoms could also kill off Lyme disease germs, a new study suggests. A study, funded by the Bay Area Lyme Foundation and conducted by Stanford School of Medicine researchers, shows that loratadine (marketed as Claritin), a common antihistamine frequently taken to treat allergy symptoms, may be able to help kill Borrelia burgdorferi, the bacteria associated with Lyme disease that’s often transmitted by ticks.”
“Our results bring us closer to the possibility of discovering the first targeted therapy to treat Lyme disease,” says Jayakumar Rajadas, PhD, Director of the Biomaterials and Advanced Drug Delivery Lab (BioADD), Stanford School of Medicine, and lead author of the study. “It’s exciting to see first-hand that our insights into the metabolic activity of this elusive bacteria may give us the ability to actually kill it.”
The results of this new laboratory study show that loratadine and specifically its metabolite, desloratadine, are able to prevent manganese (Mn) from entering the cell wall of the bacteria that causes Lyme disease, starving the bacteria and causing it to die in test tubes. The antihistamine accomplishes this by inhibiting the bacteria’s transport system.
Manganese is required for certain metabolic processes of Borrelia burgdorferi and also plays an important role in numerous biological processes in the human body. Previous research shows that in general, bacteria scavenge the body for trace metals that circulate in the blood and have developed special adaptations on their cell walls to internalize these metals. Lyme transport protein important to Lyme germs, BmtA, binds with manganese to bring it into the bacteria, and studies have shown that BmtA and manganese are required to make the bacteria harmful to the human body.”