Document Detail

Involvement of Ca(2+) signaling in intracellular invasion of non-phagocytic host cells by Orientia tsutsugamushi.
MedLine Citation:
PMID:  21362468     Owner:  NLM     Status:  Publisher    
Calcium signaling has been implicated in various steps in bacterial pathogenesis. Here, we investigated the role of Ca(2+) signaling in intracellular invasion of non-phagocytic host cells infected with Orientia tsutsugamushi, the causative agent of scrub typhus. The bacteria induced a transient Ca(2+) increase in HeLa cells immediately after infection and the source of the mobilized Ca(2+) appears to be intracellular stores, not the extracellular milieu, as determined using extracellular (EGTA) or intracellular (BAPTA-AM) Ca(2+) chelators. O. tsutsugamushi rapidly induced activation of PLC-γ1, as indicated by tyrosine phosphorylation. PLC-γ1 activity increased within 1 min of infection and returned to the basal level by 5 min. Pretreatment of host cells with inhibitors of PLC-γ1 (U73122) or IP3R channel activity (2-APB) significantly blocked bacterial entry without affecting bacterial attachment. In addition, these chemical inhibitors were effective in suppressing not only the activation of ERK MAP kinase but also the expression of the chemokine MCP-1. Taken together, Ca(2+) signaling induced by O. tsutsugamushi may play a crucial role in bacterial pathogenesis including inflammatory reactions as well as intracellular invasion into non-phagocytic host cells.
Youngho Ko; Nam-Hyuk Cho; Bon-A Cho; Ik-Sang Kim; Myung-Sik Choi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-26
Journal Detail:
Title:  Microbial pathogenesis     Volume:  -     ISSN:  1096-1208     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-3-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8606191     Medline TA:  Microb Pathog     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier India Pvt Ltd.
Department of Microbiology and Immunology, Seoul National University College of Medicine.
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