PMID: 7515094Jun 1, 1994Paper

Comparison of biological responses of human monocytes and THP-1 cells to chemokines of the intercrine-beta family

Journal of Leukocyte Biology
K Vaddi, R C Newton

Abstract

The biological responses of human monocytes and cells of the monomyelocytic THP-1 cell line to stimulation with members of the beta chemokine family are described in this report. All three chemokines tested, MCP-1, MIP-1 alpha, and RANTES, elicited mobilization of intracellular free calcium in monocytes and THP-1 cells. The magnitude of response was highest with MCP-1 stimulation. MCP-1 desensitized monocyte responses to MIP-1 alpha and RANTES, but no such desensitization was observed in THP-1 cells. MIP-1 alpha or RANTES did not desensitize either monocytes or THP-1 cells to MCP-1 stimulation. All three chemokines elicited a potent chemotactic response in monocytes that was comparable in magnitude to that of f-Met-Leu-Phe. MIP-1 alpha and RANTES required a fivefold higher dose than MCP-1 to elicit a peak response. On the contrary, THP-1 cells showed no significant chemotactic response. Studies of the desensitization of the monocyte chemotactic response indicated that all three chemokines are capable of causing complete homologous desensitization. Heterologous desensitization was observed only when monocytes were treated with MCP-1 followed by MIP-1 alpha or RANTES. Studies of actin polymerization and cell polarization response...Continue Reading

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