Internalization of FimH+ Escherichia coli by the human mast cell line (HMC-1 5C6) involves protein kinase C.

Journal Article (Journal Article)

Rodent mast cells (MC) play critical roles in host defense against bacterial infection. However, bacteria-mediated signaling mechanisms in MC have not been studied. In addition, the response of human MC to bacteria is not fully investigated. This study examined the interaction between human MC and type 1 fimbriated Escherichia coli and the mechanisms involved using the human MC line HMC-1 5C6 and human cord blood-derived MC. These MC internalized significant numbers of FimH+ E. coli, but not its isogenic FimH- mutant. In HMC-1 cells, bacterial internalization was stimulated by protein kinase C (PKC) activation [short-term phorbol myristate acetate (PMA) treatment] and dramatically decreased by PKC inhibitors or PKC depletion (long-term PMA treatment). Moreover, bacterial internalization was accompanied by significant expression of PKCbeta1 and delta. Fluorescence microscopy demonstrated accumulation of PKCbeta1 on internalized bacteria. These data indicate that human MC has the capacity to internalize bacteria and PKC may be a critical intracellular mediator of this function.

Full Text

Duke Authors

Cited Authors

  • Lin, TJ; Gao, Z; Arock, M; Abraham, SN

Published Date

  • December 1999

Published In

Volume / Issue

  • 66 / 6

Start / End Page

  • 1031 - 1038

PubMed ID

  • 10614787

International Standard Serial Number (ISSN)

  • 0741-5400

Digital Object Identifier (DOI)

  • 10.1002/jlb.66.6.1031


  • eng

Conference Location

  • United States