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Borrelia burgdorferi BBB07 interaction with integrin alpha3beta1 stimulates production of pro-inflammatory mediators in primary human chondrocytes. Cell Microbiol 2008 Feb;10(2):320-31 PMID: 17822440 PMCID: PMC2586958

Pubmed ID



Borrelia burgdorferi, the causative agent of Lyme disease, activates multiple signalling pathways leading to induction of pro-inflammatory mediators at sites of inflammation. Binding of B. burgdorferi to integrin alpha(3)beta(1) on human chondrocytes activates signalling leading to release of several pro-inflammatory mediators, but the B. burgdorferi protein that binds integrin alpha(3)beta(1) and elicits this response has remained unknown. A search of the B. burgdorferi genome for a canonical integrin binding motif, the RGD (Arg-Gly-Asp) tripeptide, revealed several candidate ligands for integrins. In this study we show that one of these candidates, BBB07, binds to integrin alpha(3)beta(1) and inhibits attachment of intact B. burgdorferi to the same integrin. BBB07 is expressed during murine infection as demonstrated by recognition by infected mouse sera. Recombinant purified BBB07 induces pro-inflammatory mediators in primary human chondrocyte cells by interaction with integrin alpha(3)beta(1). This interaction is specific, as P66, another integrin ligand of B. burgdorferi, does not activate signalling through alpha(3)beta(1). In summary, we have identified a B. burgdorferi protein, BBB07, that interacts with integrin alpha(3)beta(1) and stimulates production of pro-inflammatory mediators in primary human chondrocyte cells.

Author List

Behera AK, Durand E, Cugini C, Antonara S, Bourassa L, Hildebrand E, Hu LT, Coburn J


Jenifer Coburn PhD Professor in the Medicine department at Medical College of Wisconsin


2-s2.0-38049107588   50 Citations

MESH terms used to index this publication - Major topics in bold

Bacterial Proteins
Borrelia burgdorferi
Inflammation Mediators
Integrin alpha3beta1
Lyme Disease
Recombinant Fusion Proteins
Signal Transduction
jenkins-FCD Prod-321 98992d628744e349846c2f62ac68f241d7e1ea70