Document Detail

Lipid rafts, caveolae, caveolin-1, and entry by Chlamydiae into host cells.
MedLine Citation:
PMID:  12799183     Owner:  NLM     Status:  MEDLINE    
Obligate intracellular bacterial pathogens of the genus Chlamydia are reported to enter host cells by both clathrin-dependent and clathrin-independent processes. C. trachomatis serovar K recently was shown to enter cells via caveolae-like lipid raft domains. We asked here how widespread raft-mediated entry might be among the Chlamydia. We show that C. pneumoniae, an important cause of respiratory infections in humans that additionally is associated with cardiovascular disease, and C. psittaci, an important pathogen in domestic mammals and birds that also infects humans, each enter host cells via cholesterol-rich lipid raft microdomains. Further, we show that C. trachomatis serovars E and F also use these domains to enter host cells. The involvement of these membrane domains in the entry of these organisms was indicated by the sensitivity of their entry to the raft-disrupting agents Nystatin and filipin, and by their intracellular association with caveolin-1, a 22-kDa protein associated with the formation of caveolae in rafts. In contrast, caveolin-marked lipid raft domains do not mediate entry of C. trachomatis serovars A, 36B, and C, nor of LGV serovar L2 and MoPn. Finally, we show that entry of each of these chlamydial strains is independent of cellular expression of caveolin-1. Thus, entry via the Nystatin and filipin-sensitive pathway is dependent on lipid rafts containing cholesterol, rather than invaginated caveolae per se.
Elizabeth S Stuart; Wilmore C Webley; Leonard C Norkin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Experimental cell research     Volume:  287     ISSN:  0014-4827     ISO Abbreviation:  Exp. Cell Res.     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-06-11     Completed Date:  2003-07-31     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0373226     Medline TA:  Exp Cell Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  67-78     Citation Subset:  IM    
Department of Microbiology, University of Massachusetts, 203 Morrill Science Center IVN, Amherst, MA 01003-5720, USA.
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MeSH Terms
Anti-Bacterial Agents / pharmacology
Caveolae / drug effects,  metabolism,  microbiology*
Caveolin 1
Caveolins / metabolism*
Chlamydia / drug effects,  metabolism*,  pathogenicity*
Chlamydia Infections / drug therapy,  genetics,  metabolism*
Cholesterol / metabolism
Dose-Response Relationship, Drug
Eukaryotic Cells / drug effects,  metabolism,  microbiology*
Filipin / pharmacology
Hela Cells
Host-Parasite Interactions / drug effects,  physiology
Membrane Microdomains / drug effects,  metabolism,  microbiology*
Nystatin / pharmacology
Species Specificity
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/CAV1 protein, human; 0/Caveolin 1; 0/Caveolins; 1400-61-9/Nystatin; 480-49-9/Filipin; 57-88-5/Cholesterol

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