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Figure 6. Myeloid expression of hALX changes the exudate levels of LXA4 and LTB4. Upper left panel: LC/MS/MS of endogenous LXA4 in peritoneal exudates from hALX transgenic mice (black bars, n=2) and their nontransgenic littermates (gray bars, n=2). Exudates formed after peritoneal injection of zymosan A for 4 h, as in Fig. 4. The proinflammatory eicosanoid LTB4 (lower panel left) in nontransgenic mice (gray bars) and in transgenic hALX mice (line A, black bars). Upper right: MS/MS spectra of LXA4 (M-H, m/z 351); lower right: LTB4 (M-H, m/z 335). Diagnostic ions are denoted in the inset structures of LXA4 and LTB4 (using gray arrows) with major fragments indicated in their respective spectrum. Also, LC retention times and characteristic UV chromophores were used for identification of each eicosanoid (see text and Materials and Methods for further detail).
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