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The most widely used type Ⅱ pyrethroid is β-cypermethrin (β-CYP),and 3-phenoxybenzoic acid (3-PBA) is one of its primary metabolites.Although CYP has been shown to pose toxic effects in some immune cells,as of now the immunotoxicity of CYP on immune progenitor cells has not been well studied.In this study,we evaluated the immunotoxicity of β-CYP and 3-PBA on the human promyelocytic leukemia cell line,HL-60.Both β-CYP and 3-PBA reduced cell viability.In addition,both β-CYP and 3-PBA stimulated the intrinsic apoptotic pathway in a dose-and timedependent manner,while only β-CYP induced cell cycle arrest in G1 stage.Moreover,exposure to β-CYP and 3-PBA at 100 μM inhibited all-trans retinoic acid (ATRA)-induced mRNA expressions of the granulocytic differentiation-related genes,CD11b and CSF-3R.Furthermore,exposure to β-CYP and 3-PBA resulted in a downregulation of the granulocytic differentiation promoting transcriptional factors,PU.1 and C/EBPε.Furthermore,we found that β-CYP and 3-PBA exposure led to elevated levels of cellular reactive oxygen species (ROS),and that pretreatment with N-acetylcysteine (NAC) blocked the toxic effects caused by β-CYP and 3-PBA.The results obtained in the present study provide evidence showing the immunotoxic effects of β-CYP and 3-PBA on promyelocytic cells as well as its possible underlying mechanism.