Abstract
Macrophage inflammatory protein (MIP) 1 alpha has myelosuppressive and myeloprotective activity. That MIP-1 alpha polymerizes is known; this phenomenon was evaluated in terms of myelosuppression by assessing the effects of recombinant murine MIP-1 alpha on colony formation of murine and human myeloid progenitor cells in vitro. The following results are reported: (i) Polymerization is diluent- and concentration-dependent. (ii) Monomeric MIP-1 alpha is the active suppressive form for myeloid progenitor cells in vitro. (iii) Polymerized MIP-1 alpha is inactive and does not interfere with suppression by monomeric MIP-1 alpha. (iv) MIP-1 alpha has approximately 1000-fold higher specific activity than has been reported, but its effects are still specific for immature subsets of myeloid progenitors. (v) Suppression is initiated during the DNA-synthesis phase of the cell cycle. We conclude that polymerization of MIP-1 alpha might be a control mechanism that limits the myelosuppressive effects of monomeric MIP-1 alpha.
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