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- W2017289898 abstract "The effects of human recombinant lipocortin I (annexin I) and bovine lung calpactin I (annexin II) on porcine pancreatic phospholipase A2 (PLA2) activity in phosphatidylcholine (PC)/deoxycholate (DOC) mixtures were investigated. Annexin-associated decreases in PLA2 activity were observed under some conditions, for example, at high DOC/PC molar ratios; however, activation was observed under other conditions. NaCl, which lowers the non-critical micellar concentration (NCMC) of deoxycholate, caused significant decreases in control PLA2 activity in the absence of annexins, and greater decreases in PLA2 activity in annexin-containing samples, resulting in an apparent increase in inhibition. The PC/DOC substrate mixtures themselves appeared unstable. Despite a large excess of detergent, precipitates were, at times, observed upon incubation of some PC/DOC mixtures at 37 degrees C. Such behavior is of interest in view of the numerous reports of PLA2 inhibition by annexins and annexin-derived peptides in the PC/DOC system. The influence of the annexins on activity in this system is consistent with effects on the phase behavior of the PC/DOC mixture and/or competition with the enzyme for available Ca2+. These results caution against use of the PC/DOC system for analysis of potential PLA2 inhibitors unless the phase behavior of the system is more fully delineated." @default.
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- W2017289898 modified "2023-09-25" @default.
- W2017289898 title "Limitations of phosphatidylcholine/deoxycholate mixtures for the analysis of phospholipase A2 inhibition and activation: Illustration with annexins" @default.
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- W2017289898 doi "https://doi.org/10.1016/0005-2760(92)90231-j" @default.
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