Effect of Monocyte Chemoattractant Protein 1 on Murine Bone Marrow Cells: Proliferation,Colony Forming Ability and Signal Transduction Pathway Involved

Abstract

Monocyte chemoattractant protein 1 (MCP-1) plays a crucial role in the migration and activation of leukocytes in both physiological and pathological contexts. In this paper, we report the in vitro effect of MCP-1 on myeloid haematopoiesis. MCP-1-treated murine nonadherent bone marrow cells (NABMCs) were assayed for in vitro proliferation and colony forming ability. It is observed that MCP-1 treatment in vitro caused an enhancement in the proliferation and colony forming ability of the murine NABMCs as compared to the untreated cells. This response was concentration-dependent and most effective at a dose of 100ng/ml MCP-1. In the presence of MCSF (200U/ml), GCSF (200U/ml), GMCSF (200U/ml) or IL-3 (200U/ml), the MCP-1-induced colony forming ability of the NABMCs was significantly augmented, indicating a synergistic effect of MCP-1 with these CSFs. However, irrespective of the CSFs used, MCP-1 stimulated the lineage-restricted differentiation of the murine BMCs into predominantly the granulocytic lineage. NABMCs cultured in medium alone formed minimal colonies. The probable signal transduction mechanism responsible for the MCP-1-induced NABMC proliferation/differentiation was also investigated. The results of the colony forming assay indicate that the protein kinase inhibitors, genistein (10 μg/ml), chelenthryin chloride (10μM), wortmannin (200nM) and PD98059 (10μM) significantly blocked the in vitro colony forming ability of the MCP-1-treated NABMCs, while the phosphatase inhibitors, okadaic acid (10nM) and sodium orthovanadate (10μM) caused an increase in the BMC colony forming ability in response to MCP-1. These data suggests the involvement of the respective protein kinases and phosphatases in the above process. Correlating with this, the role of several signaling molecules likes Lyn, p42/44MAPK, PI3K and STAT5 has also been implicated in the signal cascade of murine NABMC proliferation/differentiation following MCP-1 treatment.

Keywords

Monocyte chemoattractant protein 1 bone marrow cells colony forming ability signal transduction

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