TY - JOUR
T1 - Staphylococcus epidermidis lipoteichoic acid
T2 - Exocellular release and ltaS gene expression in clinical and commensal isolates
AU - García-Gómez, Elizabeth
AU - Miranda-Ozuna, Jesús F.T.
AU - Díaz-Cedillo, Francisco
AU - Vázquez-Sánchez, Ernesto A.
AU - Rodríguez-Martínez, Sandra
AU - Jan-Roblero, Janet
AU - Cancino-Diaz, Mario E.
AU - Cancino-Diaz, Juan Carlos
N1 - Publisher Copyright:
© 2017 The Authors.
PY - 2017/7
Y1 - 2017/7
N2 - Purpose. Staphylococcus epidermidis ATCC12228 lipoteichoic acid (LTA) inhibits TNFα production from keratinocytes that are activated with poly I:C. However, this effect has not been proven in clinical or commensal isolates. Methodology. The <10 kDa fractions of S. epidermidis isolates from ocular infections (n=56), healthy skin (n=35) and healthy conjunctiva (n=32) were obtained. TNFα production was determined by ELISA in HaCaT keratinocytes stimulated with poly I:C and with the <10 kDa fractions. LTA in the cytoplasmic membrane and in the <10 kDa fractions of the isolates was determined during bacterial growth by flow cytometry, Western blot and electrospray ionization mass spectrometry. The expression levels of ugtP, ltaA and ltaS were evaluated. Results. Two populations of isolates were found: a population that inhibited TNFα production (TNFα-inhibitor isolates) and a population that did not inhibit it (TNFα non-inhibitor isolates). The cells from the TNFα-inhibitor isolates had less LTA in the cytoplasmic membrane compared to the cells from the TNFα non-inhibitor isolates (P<0.05). Similarly, LTA was detected in the supernatants of TNFα-inhibitor isolates, and it was absent in TNFα non-inhibitor isolates. High expression levels of the ugtP and ltaA genes in the 1850I (TNFα-inhibitor isolate) and 37HS (TNFα non-inhibitor isolate) isolates were found during bacterial growth. However, the ltaS gene had a low expression level (P<0.05) in the 37HS isolate. Conclusion. The TNFα-inhibitor isolates release LTA due to high expression of the LTA synthesis genes. By contrast, TNFα non-inhibitor isolates do not release LTA due to low expression level of the ltaS gene.
AB - Purpose. Staphylococcus epidermidis ATCC12228 lipoteichoic acid (LTA) inhibits TNFα production from keratinocytes that are activated with poly I:C. However, this effect has not been proven in clinical or commensal isolates. Methodology. The <10 kDa fractions of S. epidermidis isolates from ocular infections (n=56), healthy skin (n=35) and healthy conjunctiva (n=32) were obtained. TNFα production was determined by ELISA in HaCaT keratinocytes stimulated with poly I:C and with the <10 kDa fractions. LTA in the cytoplasmic membrane and in the <10 kDa fractions of the isolates was determined during bacterial growth by flow cytometry, Western blot and electrospray ionization mass spectrometry. The expression levels of ugtP, ltaA and ltaS were evaluated. Results. Two populations of isolates were found: a population that inhibited TNFα production (TNFα-inhibitor isolates) and a population that did not inhibit it (TNFα non-inhibitor isolates). The cells from the TNFα-inhibitor isolates had less LTA in the cytoplasmic membrane compared to the cells from the TNFα non-inhibitor isolates (P<0.05). Similarly, LTA was detected in the supernatants of TNFα-inhibitor isolates, and it was absent in TNFα non-inhibitor isolates. High expression levels of the ugtP and ltaA genes in the 1850I (TNFα-inhibitor isolate) and 37HS (TNFα non-inhibitor isolate) isolates were found during bacterial growth. However, the ltaS gene had a low expression level (P<0.05) in the 37HS isolate. Conclusion. The TNFα-inhibitor isolates release LTA due to high expression of the LTA synthesis genes. By contrast, TNFα non-inhibitor isolates do not release LTA due to low expression level of the ltaS gene.
KW - Keratinocyte
KW - LTA
KW - LtaS
KW - Staphylococcus epidermidis
KW - TNFalpha
UR - http://www.scopus.com/inward/record.url?scp=85026629024&partnerID=8YFLogxK
U2 - 10.1099/jmm.0.000502
DO - 10.1099/jmm.0.000502
M3 - Artículo
C2 - 28639932
SN - 0022-2615
VL - 66
SP - 864
EP - 873
JO - Journal of Medical Microbiology
JF - Journal of Medical Microbiology
IS - 7
M1 - 000502
ER -