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Title: Streptolysin-induced endoplasmic reticulum stress promotes Group A Streptococcal host-associated biofilm formation and necrotising fasciitis
Authors: Vajjala, Anuradha
Biswas, Debabrata
Tay, Wei Hong
Hanski, Emanuel
Kline, Kimberly Ann
Keywords: Biofilms
ER Stress
DRNTU::Science::Biological sciences
Issue Date: 2018
Source: Vajjala, A., Biswas, D., Tay, W. H., Hanski, E., & Kline, K. A. (2018). Streptolysin‐induced endoplasmic reticulum stress promotes Group A Streptococcal host‐associated biofilm formation and necrotising fasciitis. Cellular Microbiology, 21(1), e12956-. doi:10.1111/cmi.12956
Series/Report no.: Cellular Microbiology
Abstract: Group A Streptococcus (GAS) is a human pathogen that causes infections ranging from mild to fulminant and life‐threatening. Biofilms have been implicated in acute GAS soft‐tissue infections such as necrotising fasciitis (NF). However, most in vitro models used to study GAS biofilms have been designed to mimic chronic infections and insufficiently recapitulate in vivo conditions along with the host-pathogen interactions that might influence biofilm formation. Here, we establish and characterise an in vitro model of GAS biofilm development on mammalian cells that simulates microcolony formation observed in a mouse model of human NF. We show that on mammalian cells, GAS forms dense aggregates that display hallmark biofilm characteristics including a 3D architecture and enhanced tolerance to antibiotics. In contrast to abiotic‐grown biofilms, host‐associated biofilms require the expression of secreted GAS streptolysins O and S (SLO, SLS) that induce endoplasmic reticulum (ER) stress in the host. In an in vivo mouse model, the streptolysin null mutant is attenuated in both microcolony formation and bacterial spread, but pretreatment of soft‐tissue with an ER stressor restores the ability of the mutant to form wild‐type‐like microcolonies that disseminate throughout the soft tissue. Taken together, we have identified a new role of streptolysin‐driven ER stress in GAS biofilm formation and NF disease progression.
ISSN: 1462-5814
DOI: 10.1111/cmi.12956
Rights: © 2018 John Wiley & Sons Ltd. All rights reserved. This paper was published in Cellular Microbiology and is made available with permission of John Wiley & Sons Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SBS Journal Articles
SCELSE Journal Articles

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