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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Leukotriene C4 inhibits ATP-dependent transport of glutathione S-conjugate across rat heart sarcolemma. Implication for leukotriene C4 translocation mediated by glutathione S-conjugate carrier.

Sarcolemmal vesicles prepared from rat heart exhibited ATP-dependent uptake of S-(2,4-dinitrophenyl)glutathione (DNP-SG), which obeyed Michaelis-Menten kinetics with an apparent Km of 21 microM for DNP-SG and a Vmax of 0.27 nmol.10 min-1.mg protein-1. Several model glutathione S-conjugates inhibited DNP-SG uptake, but leukotriene C4 inhibited uptake much more significantly even at lower concentrations (competitive inhibition, Ki = 1.5 microM). However, leukotrienes D4 and E4, which lack the gamma-glutamyl moiety, were less effective. The results suggest that the ATP-dependent transport system has a high affinity for leukotriene C4, and may be responsible for the translocation of this compound.[1]

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