Abstract

We have measured cytosolic free calcium levels ([Ca ++] i) in individual macrophages during the phagocytosis of single zymosan particles. We report here that the contact of a macrophage with zymosan results in a rapid transient elevation of [Ca ++] i. Each [Ca ++] i pulse is symmetrical lasting for up to 30 seconds. In contrast, macrophage spreading is associated with repetitive [Ca ++] i spiking occuring in salvos of up to four smaller spikes, each lasting for between 8 and 18 seconds. These qualitative and kinetic differences might suggest that the role of [Ca ++] i in phagocytosis is distinct from its role in spreading.

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