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2017 ; 7
(1
): 2953
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Elongation factor Tu on Escherichia coli isolated from urine of kidney stone
patients promotes calcium oxalate crystal growth and aggregation
#MMPMID28592876
Amimanan P
; Tavichakorntrakool R
; Fong-Ngern K
; Sribenjalux P
; Lulitanond A
; Prasongwatana V
; Wongkham C
; Boonsiri P
; Umka Welbat J
; Thongboonkerd V
Sci Rep
2017[Jun]; 7
(1
): 2953
PMID28592876
show ga
Escherichia coli is the most common bacterium isolated from urine and stone
matrix of calcium oxalate (CaOx) stone formers. Whether it has pathogenic role(s)
in kidney stone formation or is only entrapped inside the stone remains unclear.
We thus evaluated differences between E. coli isolated from urine of patients
with kidney stone (EUK) and that from patients with urinary tract infection (UTI)
without stone (EUU). From 100?stone formers and 200 UTI patients, only four pairs
of EUK/EUU isolates had identical antimicrobial susceptibility patterns.
Proteomic analysis revealed nine common differentially expressed proteins. Among
these, the greater level of elongation factor Tu (EF-Tu) in EUK was validated by
Western blotting. Outer membrane vesicles (OMVs) derived from EUK had greater
promoting activities on CaOx crystallization, crystal growth and aggregation as
compared to those derived from EUU. Neutralizing the OMVs of EUK with monoclonal
anti-EF-Tu antibody, not with an isotype antibody, significantly reduced all
these OMVs-induced promoting effects. Moreover, immunofluorescence staining of
EF-Tu on bacterial cell surface confirmed the greater expression of surface EF-Tu
on EUK (vs. EUU). Our data indicate that surface EF-Tu and OMVs play significant
roles in promoting activities of E. coli on CaOx crystallization, crystal growth
and aggregation.