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Role of CsrR, hyaluronic acid, and SpeB in the internalization of Streptococcus pyogenes M type 3 strain by epithelial cells
Year:
2002
Source of publication :
Infection and Immunity
Authors :
Sela, Shlomo
;
.
Volume :
70
Co-Authors:
Jadoun, J., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Eyal, O., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Sela, S., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Facilitators :
From page:
462
To page:
469
(
Total pages:
8
)
Abstract:
Internalization of group A streptococcus by human epithelial cells has been extensively studied during the past 6 years. It is now clear that multiple mechanisms are involved in this process. We have previously demonstrated that the CsrR global regulator controls the internalization of an invasive M type 3 strain through regulation of the has (hyaluronic acid synthesis) operon, as well as another, unknown gene(s). Recently, it was reported that the CsrR-regulated cysteine protease (SpeB) is also involved in bacterial uptake. In this study we have examined the roles of CsrR, hyaluronic acid capsule, and SpeB in streptococcal internalization. We have constructed isogenic mutants of the M3 serotype deficient in the csrR, hasA, and speB genes and tested their ability to be internalized by HEp-2 epithelial cells. Inactivation of csrR abolished internalization, while inactivation of either hasA or speB increased the internalization efficiency. Mutation in csrR derepressed hasA transcription and lowered the activity of SpeB, while no effect on speB transcription was observed. The speB mutant expressed smaller amounts of capsule, while the hasA mutant transcribed more csrR and speB mRNAs. Thus, it seems that complex interactions between CsrR, SpeB, and capsule are involved in modulation of group A streptococcus internalization.
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More details
DOI :
10.1128/IAI.70.2.462-469.2002
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
20056
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:33
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Scientific Publication
Role of CsrR, hyaluronic acid, and SpeB in the internalization of Streptococcus pyogenes M type 3 strain by epithelial cells
70
Jadoun, J., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Eyal, O., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Sela, S., Department of Food Science, Institute for Technology and Storage, Volcani Center, P.O. Box 6, Beth-Dagan 50250, Israel
Role of CsrR, hyaluronic acid, and SpeB in the internalization of Streptococcus pyogenes M type 3 strain by epithelial cells
Internalization of group A streptococcus by human epithelial cells has been extensively studied during the past 6 years. It is now clear that multiple mechanisms are involved in this process. We have previously demonstrated that the CsrR global regulator controls the internalization of an invasive M type 3 strain through regulation of the has (hyaluronic acid synthesis) operon, as well as another, unknown gene(s). Recently, it was reported that the CsrR-regulated cysteine protease (SpeB) is also involved in bacterial uptake. In this study we have examined the roles of CsrR, hyaluronic acid capsule, and SpeB in streptococcal internalization. We have constructed isogenic mutants of the M3 serotype deficient in the csrR, hasA, and speB genes and tested their ability to be internalized by HEp-2 epithelial cells. Inactivation of csrR abolished internalization, while inactivation of either hasA or speB increased the internalization efficiency. Mutation in csrR derepressed hasA transcription and lowered the activity of SpeB, while no effect on speB transcription was observed. The speB mutant expressed smaller amounts of capsule, while the hasA mutant transcribed more csrR and speB mRNAs. Thus, it seems that complex interactions between CsrR, SpeB, and capsule are involved in modulation of group A streptococcus internalization.
Scientific Publication
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