Journal
CELLULAR & MOLECULAR BIOLOGY LETTERS
Volume 15, Issue 3, Pages 496-506Publisher
BMC
DOI: 10.2478/s11658-010-0019-z
Keywords
Listeria monocytogenes; Internalin B; Integrins; FAK; Paxillin
Categories
Funding
- Ministero della Sanita, Rome, Italy
Ask authors/readers for more resources
Listeria monocytogenes enters non-phagocytic cells by binding its surface proteins inlA (internalin) and inlB to the host's E-cadherin and Met, respectively. The two internalins play either separate or cooperative roles in the colonization of infected tissues. Here, we studied bacterial uptake into HeLa cells using an L. monocytogenes mutant strain (Delta inlA) carrying a deletion in the gene coding for inlA. The Delta inlA mutant strain showed the capability to invade HeLa cells. The monoclonal anti-beta(3)- and anti-beta(1)-integrin subunit antibodies prevented bacterial uptake into the cells, while the anti-beta(2)- and anti-beta(4)-integrin subunit antibodies failed to affect L. monocytogenes entry into HeLa cells. Three structurally distinct disintegrins (kistrin, echistatin and flavoridin) also inhibited bacterial uptake, showing different potencies correlated to their selective affinity for the beta(3)- and beta(1)-integrin subunits. In addition to inducing Met phosphorylation, infection of cells by the L. monocytogenes Delta inlA mutant strain promoted the tyrosine phosphorylation of the focal adhesion-associated proteins FAK and paxillin. Our findings provide the first evidence that beta(3)- and beta(1)-integrin receptors play a role in the inlB-dependent internalization of L. monocytogenes into host cells.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available