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We encountered a case of neonatal acute megakaryoblastic leukemia not associated with Down syndrome (DS). Molecular cytogenetic analysis of leukemic blast cells indicated that increased blast cell status was caused by transient abnormal myelopoiesis with trisomy 21 and GATA1 mutation. Based on these molecular cytogenetic data, intensive chemotherapy was avoided, and the patient was successfully cured with low-dose cytarabine. Morphologically, leukemic blast cells of acute megakaryoblastic leukemia in a non-DS neonate are indistinguishable from a blast cell of transient abnormal myelopoiesis. The possibility of transient abnormal myelopoiesis should be carefully considered before intensive chemotherapy is adopted.

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Although chorioamnionitis (CAM) has been demonstrated to be associated with numerous short- and long-term morbidities, the precise mechanisms remain unclear. One of the reasons for this is the lack of appropriate models for analyzing the relationship between the fetal environment and chorioamnionitis and fetal programming in humans. In this study, we aimed to clarify the fetal programming caused by CAM using the gene expression profiles of UCMSCs. From nine preterm neonates with CAM (n = 4) or without CAM (n = 5), we established UCMSCs. The gene expression profiles obtained by RNA-seq analysis revealed distinctive changes in the CAM group USMSCs. The UCMSCs in the CAM group had a myofibroblast-like phenotype with significantly increased expression levels of myofibroblast-related genes, including α-smooth muscle actin (p < 0.05). In the pathway analysis, the genes involved in DNA replication and G1 to S cell cycle control were remarkably decreased, suggesting that cellular proliferation was impaired, as confirmed by the cellular proliferation assay (p < 0.01–0.05). Pathway analysis revealed that genes related to white fat cell differentiation were significantly increased. Our results could explain the long-term outcomes of patients who were exposed to CAM and revealed that UCMSCs could be an in vitro model of fetal programming affected by CAM.