Abstract
The principal sulfatide of virulentMycobacterium tuberculosis, sulfolipid-I (SL-I), both directly stimulates neutrophil superoxide (O −2 ) release and, at substimulatory concentrations, primes these cells for markedly enhanced oxidative responsiveness to other stimuli. The present study was undertaken to clarify the priming mechanisms by comparing cellular events following priming doses of SL-I with those following priming with N-formyl-methionyl-leucyl-phenylalanine (FMLP). We compared the involvement of the calcium cation (Ca2+), as well as membrane protein kinase C (PKC) activity and the translocation of NADPH oxidase-cytosolic cofactor effected by priming levels of the two agonists. The investigation led to two important conclusions. First, we clearly demonstrate that priming by both SL-I and FMLP results from activation of cellular processes that are not involved in direct oxidative activation. For example, whereas direct induction of O −2 generation by FMLP and SL-I required increases in intracellular Ca2+, an increase in intracellular calcium concentration ([Ca2+]i) above basal levels was not required for priming. Second, we identified key differences in the cellular responses to priming doses of SL-I and FMLP. Whereas increased membrane PKC activity caused by priming doses of FMLP was only partially blocked by chelation of intracellular Ca2+, Ca2+ chelation completely inhibited the increase in membrane PKC activity caused by SL-I. NADPH oxidase-cytosolic factor translocation to plasma membranes was completely blocked by pertussis toxin when priming doses of SL-I were used. This guanine-nucleotide-binding protein inhibitor had no effect on FMLP-dependent translocation of the oxidase cofactors. The comparative approach introduced in this report provides a valuable and novel method to discern the complex interactions of various cellular processes that regulate the state of activation of stimulated cells.
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Zhang, L., Gay, J.C., English, D. et al. Neutrophil priming mechanisms of sulfolipid-I and n-formyl-methionyl-leucyl-phenylalanine. J Biomed Sci 1, 253–262 (1994). https://doi.org/10.1007/BF02253310
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DOI: https://doi.org/10.1007/BF02253310