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. 1992 Mar;3(3):335–347. doi: 10.1091/mbc.3.3.335

Transmembrane-mediated changes in [Ca2+] are involved in the signaling pathway leading to macrophage cytocidal differentiation: implications of localized changes in intracellular [Ca2+] and of interferon priming on Ca2+ utilization.

G A Underwood 1, D W Riches 1
PMCID: PMC275534  PMID: 1627833

Abstract

Macrophage cytocidal activation requires the sequential impingement on the macrophage of a priming stimulus (interferon [IFN] alpha, beta, or gamma) and a triggering stimulus (such as polyinosinic acid:polycytidylic acid [poly [I:C]] or bacterial lipopolysaccharide). The mechanism of progression from the IFN-primed state to the cytocidal state is poorly understood. By quantifying the level of expression of a gene product (complement component factor B [Bf]) associated with cytocidal activation and through the use of phenotypically distinct populations of macrophages (unprimed and IFN-primed), we have investigated the functional necessity of changes in intracellular concentration of free calcium ions ([Ca2+]i) in signaling the transition from the primed to the cytocidal state. Elevating the [Ca2+]i by incubation of unprimed macrophages with the calcium ionophore, ionomycin, failed to induce the expression of Bf. By contrast, Bf was expressed at high levels when IFN-primed macrophages were exposed to ionomycin, suggesting that priming induced within the macrophages the capacity to respond to a nonspecific change in [Ca2+]i. Quantification of the [Ca2+]i in response to exposure to ionomycin revealed an initial transient elevation, followed by a secondary sustained component. No differences in these changes were observed between unprimed and IFN-primed macrophages. We therefore questioned if changes in [Ca2+]i were also implicated in the transition between the primed and the cytocidal state using the ligand, poly [I:C]. In contrast to ionomycin, incubation of IFN-primed macrophages with poly [I:C] did not sustain measurable increases in [Ca2+]i, yet fully stimulated the transition from the IFN primed to the cytocidal state. However, incubation of IFN-primed macrophages with poly [I:C] in the presence of 1) a Ca2+/ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid buffer calculated to clamp the extracellular concentration of free calcium ions to a value approximately equal to the resting [Ca2+]i; 2) the calcium channel blocker verapamil; or 3) the intracellular Ca2+ antagonists (W-7, W-13, and TMB-8) substantially inhibited the induction of Bf. Collectively, these data support the following conclusions. First, that changes in [Ca2+]i comprise an important element in the induction of progression from the IFN-primed to the cytocidal state. Second, the failure to detect global changes in [Ca2+]i in response to the ligand, poly [I:C], suggests that changes in [Ca2+]i or Ca2+ movement may occur in either a spatially restricted or in an asynchronous cyclical fashion and are not detected by population fluorescence measurements. Third, the source of the relevant Ca2+ is extracellular. Fourth, our findings suggest that priming influences macrophage functional responses at a locus that is distal to the changes in [Ca2+]i, thereby potentially allowing signaling processes to be utilized to initiate different cellular responses.

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Selected References

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