Establishment of a zebrafish hematological disease model induced by 1,4-benzoquinone

Abstract

Benzene exposure is associated with various hematological disorders, especially leukemia. The reactive metabolite of benzene, 1,4-Benzoquinone (BQ), generated in bone marrow (BM), is suggested to be a key molecule in mediating benzene-induced hematotoxicity and carcinogenicity. Yet, its pathogenic role remains largely unknown due to lack of suitable vertebrate whole-organism models. Here, we present an in vivo study to reveal the effect of BQ exposure on hematotoxicity in zebrafish. From embryonic stages to adulthood, BQ exposure suppressed erythroid and lymphoid hematopoiesis but abnormally accumulated myeloid cells and precursors, which resembles benzene-induced cytopenia and myeloid dysplasia in humans. This myeloid expansion is caused by granulocyte but not macrophage lineage, emphasizing the significant role of lineage specificity in BQ-mediated hematopoietic toxicity. Analysis of the c-myb-deficient mutant cmybhkz3 revealed that BQ induced neutrophilia in a c-myb-dependent manner, demonstrating that c-myb is a key intrinsic mediator of BQ hematotoxicity. Our study reveals that BQ causes lineage-specific hematotoxicity in zebrafish from embryonic stages to adulthood. Since c-myb is indispensable for BQ to induce neutrophilia, c-myb may serve as a potential drug target for reversing BQ hematotoxicity.