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. 1981 May;32(2):464–468. doi: 10.1128/iai.32.2.464-468.1981

Specificity and reversibility of chemotactic deactivation of human monocytes.

W Falk, E J Leonard
PMCID: PMC351467  PMID: 6265358

Abstract

The chemotactic deactivation of human monocytes was studied to provide insight into the mechanism of chemotaxis. Deactivation was dependent on the dose of chemoattractant and time of incubation. A concentration in the cell suspension of 10(-8) M N-formylmethionylleucyl phenylalanine (FMLP) for 45 min at 37 degrees C led to 60% suppression of the subsequent specific chemotactic response. Higher concentrations of FMLP led to almost 100% specific suppression. Deactivation was specific under all conditions used. The response to a nonrelated chemoattractant, human serum-derived C5a, was unaffected by incubation in FMLP. Deactivation was also transient. If cells were deactivated at 37 degrees C with FMLP, they recovered within 6 h at 37 degrees C from this deactivation. Both phenomena, deactivation and recovery from deactivation, were temperature dependent. Monocytes could not be deactivated at 0 degrees C, and they did not recover from deactivation when kept at 0 degrees C. Thus, specific deactivation appears to require cellular metabolism, involving loss of receptors or blocking of a step between receptor occupancy and response.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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