ISSN:
1432-0991
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract. Ibuprofen, one of the nonsteroidal anti-inflammatory drugs, inhibited arylamine N-acetyltransferase activity of Klebsiella pneumoniae both in vitro and in vivo. The NAT activities of Klebsiella pneumoniae were inhibited by ibuprofen in a dose-dependent manner both in vitro and in vivo. In vitro, the NAT activity was 0.675 ± 0.028 nmol/min/mg of protein for the acetylation of 2-aminofluorene. In the presence of 8 mM ibuprofen, the NAT activity was 0.506 ± 0.002 nmol/min/mg of protein for the acetylation of 2-aminofluorene. In vivo, the NAT activity was 0.279 ± 0.016 nmol/min/1010 colony forming units (CFU) for the acetylation of 2-aminofluorene. In the presence of 8 mM ibuprofen, the NAT activity was 0.228 ± 0.008 nmol/min/1010 CFU for the acetylation of 2-aminofluorene. The inhibition of NAT activity by ibuprofen was shown to persist for at least 4 h. For in vitro examination, the values of apparent K m and V max were 1.08 ± 0.05 mM and 9.17 ± 0.11 nmol/min/mg of protein, respectively, for 2-aminofluorene. However, when 8 mM of ibuprofen was added to the reaction mixtures, the values of apparent K m and V max were 1.19 ± 0.01 mM and 6.67 ± 0.11 nmol/min/mg of protein, respectively, for 2-aminofluorene. For in vivo examination, the values of apparent K m and V max were 1.24 ± 0.48 mM and 4.18 ± 1.06 nmol/min/10 × 1010 CFU, respectively, for 2-aminofluorene. However, when 8 mM of ibuprofen was added to the culture, the values of apparent K m and V max were 0.95 ± 0.29 mM and 2.77 ± 0.37 nmol/min/mg protein, respectively, for 2-aminofluorene, respectively. This report is the first finding of ibuprofen inhibition of arylamine N-acetyltransferase activity in a strain of Klebsiella pneumoniae.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002849900238
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