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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Young, J. D. Ko, S. S. Cohn, Z. A. |
| Abstract | The concentration of cytosolic free calcium, [Ca2+]i, was measured in J774 mouse macrophages by use of the fluorescent indicator quin-2. Resting [Ca2+]i was 87 nM. Addition of a number of specific ligands to the immunoglobulin gamma 2b/gamma 1 Fc receptor resulted in a transient increase in [Ca2+]i, the magnitude of which depended on the extent of receptor aggregation. Monovalent ligands gave only a small Ca2+ signal but blocked cell response to subsequent addition of multivalent ligands. Incubation with antibody-coated erythrocytes raised macrophage [Ca2+]i to micromolar levels. [Ca2+]i changes were only partially inhibited by the absence of external Ca2+, suggesting the release of Ca2+ from internal stores in addition to an influx of external Ca2+. These internal stores were not limited to mitochondria. An optimal range of [Ca2+]i was required for phagocytosis. Buffering [Ca2+]i with quin-2 and treating cells with quinine in the absence of external Ca2+ resulted in inhibition of phagocytosis. Increasing [Ca2+]i to micromolar levels with the calcium ionophore A23187 also resulted in similar inhibitory effects. We suggest the involvement of localized cytosolic Ca2+ gradients in generating the signals necessary for phagocytosis. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 81 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1984-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium Metabolism Immunoglobulin Fc Fragments Immunology Immunoglobulin Fragments Phagocytosis Receptors, Fc Physiology Aminoquinolines Animals Calcimycin Pharmacology Cell Line Erythrocytes Fluorescent Dyes Kinetics Macrophages Mice Drug Effects Receptors, IgG Spectrometry, Fluorescence Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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